JP5547397B2 - Injection molding apparatus, injection molded body, and method for manufacturing the same - Google Patents

Description

  The present invention relates to an injection molded body by so-called two-color molding and a manufacturing method thereof. In the present specification, the two-color molding is not only for molding an integrally molded product color-coded according to a part with a resin of a different color, but the color or material of the member differs depending on the part, and either It shall mean the molding of an integral molded product. In addition, “two colors” means “one of the two colors is different depending on the part and the material of the member”. In particular, the present invention mainly relates to a molded body in which two different types of plates are joined in a state in which the end surfaces are abutted with each other at a plate-like joining portion. Specifically, for example, a container-like object having a plate-like side peripheral wall or bottom wall and opening in one direction, such as a container or a protective cover body, the bottom wall as one bottom wall portion and the other bottom The present invention relates to a molded body molded into two colors with a material meeting surface (hereinafter referred to as a boundary surface) divided in two into a wall portion.

  Two-layer or multi-layer molding is included in the category of two-color molding, and a pre-molded first resin is disposed in the mold as the first layer, or between one mold and the other mold. The first resin is supplied to the first layer to form the first layer, and then a gap is provided between one mold holding the first layer and the other mold, and the second resin is filled into the gap. And the method of shape | molding a 2nd layer is disclosed (for example, refer patent document 1).

  Furthermore, in a method for producing a cushioning composite molded product (see, for example, Patent Document 2), a hard resin molded product molded in advance is inserted into a mold having a larger gap than the hard resin molded product, and then foamed. It is disclosed that after a rubber-like elastic body is injected into a gap and the inside of a mold is completely filled, the inside of the mold is expanded to foam a foamable rubber-like elastic body.

  Furthermore, as a sandwich molding method for obtaining a synthetic resin two-layer molded article obtained by coating the surface of the core material with a skin material, the skin material is injected into the cavity of the molding die and simultaneously with this, A molding method in which a core material is injected is disclosed (for example, see Patent Document 3).

  These are effective as a method for producing a molded body in which different materials are laminated in layers, but at the plate-like joint portion, two different types of plates are joined in a state where the end surfaces are butted together. In obtaining a molded body, for example, if the first resin molded in advance according to Patent Documents 1 and 2 is disposed in the mold as a member on one side, it is very time-consuming and inefficient. In addition, since the first resin is bonded to the second resin in a state of being cooled to a temperature close to room temperature, the bonding strength of the bonding portion is insufficient.

  Further, even if resin for one member is injected into the cavity following Patent Document 3, the boundary with the opposite member does not always have a predetermined shape, which is not practical as it is.

  As a method of controlling the boundary so as to have a predetermined shape, thermoplastic resins colored in different colors are injected from different gates of the mold, and are changed to different colors in the substantially central part in the left-right direction. When the colored resins are merged and integrally molded, a shielding plate that prevents the resin from flowing is arranged at the resin merging position in the cavity, and these two colors of synthetic resin are merged on the left and right sides of the shielding plate. After that, a two-color container integral molding method for removing the shielding plate is disclosed (for example, see Patent Document 4).

  However, this method requires a mold structure having a complicated moving mechanism for taking in and out the shielding plate, a multi-stage process cycle, and a long process cycle time, and a simpler method is desired.

Further, the method is an integral molding method of a bilaterally symmetrical two-color container, in which the shape of the container is devised, and thermoplastic resin is injected from each separate gate of the mold into a cavity in the mold, There has been disclosed a molding method in which resins colored in different colors are simply joined together at an approximately central portion in the direction to integrally form them (for example, see Patent Document 5). This method may be effective in literal two-color molding with resins that are homogeneous and therefore have the same flow characteristics in the molten state but only different colors, but in the case of two-color molding with different types of resins, the boundary between the resins It is difficult to control the shape of the surface to a predetermined shape.
Japanese Patent Laid-Open No. 9-1582 JP-A-6-234133 JP-A-5-169493 JP-A-6-842 JP-A-5-337987

  The object of the present invention is that two kinds of different plates face each other at a plate-like joint portion by a simple mold having no moving mechanism for forming a boundary surface and a simple and short process cycle. An object of the present invention is to provide an injection molding apparatus, a two-color molded body, and a method for manufacturing the same, which are capable of molding a joined molded product while being clamped.

The gist of the present invention is that the first cavity portion having a plate-shaped space portion sandwiched between a pair of opposing wall surfaces and having an interval between the wall surfaces of h and the boundary surface at one end of the space portion. A second cavity portion communicating with the first cavity portion, and a cavity defined by
A first injection means for injecting an amount of the first molding material filled in the first cavity portion into the first cavity portion; and a second molding of an amount filled in the second cavity portion. Second injection means for injecting material into the second cavity portion;
One or a plurality of elongate flow restraint portions parallel to the longitudinal direction of the boundary surface, which suppresses the flow of the first molding material in the space portion that proceeds in the space portion toward the boundary surface. Is provided,
The present invention resides in an injection molding apparatus in which a distance in the surface direction of the wall surface between the flow suppressing portion closest to the boundary surface and the boundary surface is 0 to 2 h.

  The flow restricting portion may be a gap changing portion formed of a gap expanding portion in which a gap between the wall surfaces is enlarged, a narrow portion in which a gap between the wall surfaces is reduced, or a stepped portion rising from the wall surface.

  A width of the interval changing portion in a direction orthogonal to the direction along the length of the boundary surface may be 2h or less.

  In the injection molding apparatus, the flow restricting portion closest to the boundary surface may be formed by a ridge, and the narrow portion formed by a recess may be provided adjacent to the ridge, and the protrusion The space | interval of the surface direction of the said wall surface of a strip and this concave strip may be 0-2h.

  In the injection molding apparatus, the second cavity portion may have another plate-shaped space portion sandwiched between a pair of opposing wall surfaces, and the first cavity portion is at one end of the other space portion. You can communicate with

  In the injection molding apparatus, in the other space portion, the flow of the second molding material in the other space portion toward the boundary surface is suppressed, and in a direction along the length of the boundary surface. One or a plurality of other elongated flow restricting portions may be provided in parallel, and when the distance between the pair of wall surfaces of the second cavity portion is h ′, the other flow closest to the boundary surface The space | interval of the surface direction of this wall surface between a control part and this boundary surface may be 0-2h '.

  The injection molding apparatus may include a flow control means for controlling the flow of resin flowing through the space portion toward the flow suppressing portion.

  In the injection molding apparatus, the flow suppressing portion may have a bent portion that looks at the space portion on the inner side of the bend, and the flow control means extends toward the bend portion between the pair of wall surfaces. Can be an extended interval extension path.

Further, the gist of the present invention is a molding method using the injection molding apparatus,
An amount of the first molding material filled in the first cavity portion is injected into the first cavity portion, and an amount of the second molding material filled in the second cavity portion is injected into the first cavity portion. The present invention resides in a method for producing an injection molded body in which the second molding material is injected into the second cavity portion and the second molding material is associated with the injected first molding material.

  In the method for manufacturing an injection-molded article, when the temperature of the injected first molding material at the tip of the first cavity portion is not lower than the softening point of the molding material and lower than the melting point. The second molding material in a molten state can be caused to enter the tip of the second cavity portion by injection by the second injection means so that the first component and the second component can be brought into contact with each other. .

  In the method for manufacturing an injection molded body, the second molding material may be an elastomer, and the first molding material may be a resin harder than the second molding material.

Further, the gist of the present invention is an injection-molded body obtained by the above-described method for producing an injection-molded body, and has a plate portion having a thickness hs made of different molding materials constituting the molded body. The first constituent part and the second constituent part are joined by bringing the end faces into contact with each other at the joining boundary surface located at one end of the plate part,
The first component has one or a plurality of thickness change portions in the plate portion by ribs or grooves parallel to a direction along the length of the joint boundary surface, and the joint boundary surface and the joint It is an injection-molded body in which the distance in the surface direction of the plate portion from the thickness change portion closest to the boundary surface is 0 to 2 hs.

  In the injection molded body, the second component part may have another plate part, and may be joined to the first component part at one end of the other plate part.

  In the injection molded body, the thickness change portion closest to the joining boundary surface may be formed by a groove, and the tip of the other plate portion and the tip of the plate portion of the first structure portion are joined to each other. One tip portion can be joined via a boundary surface, the joint boundary surface can form a chevron shape protruding in the direction of the second component, and the other plate portion is divided into two forks at the tip portion. And the other tip portion having a wedge shape, the tip of the one tip portion reaches the groove, and the tip of the other tip portion is the surface of the plate portion on which the groove is formed. Opposite can touch my side.

  In the injection-molded body, the thickness changing portion due to the groove can be formed in the plate portion, and the thickness changing portion due to another groove parallel to the longitudinal direction of the joining boundary surface on the other plate portion. Can be formed.

  In the injection-molded article, the molding material constituting the second constituent part may be an elastomer, and the molding material constituting the first constituent part is harder than the molding material constituting the second constituent part. It can be a resin.

    According to the present invention, a simple mold having no moving mechanism for forming a boundary surface, and a simple and short process cycle, at least one of them is a joint portion between two different members each having a plate, and the end surfaces are joined together. In the butt-matched state, the joined molded product can be molded as it is clamped, and the joining boundary is not limited to a linearly extending boundary, but extends in a curved shape. There are provided a two-color injection molding apparatus, a two-color injection molded body, and a method for manufacturing the same, which can obtain a joint interface without any disturbance.

  According to the present invention, at least one of the two different members having a plate-like shape is joined to each other with a resin different from each other, and the joined molded body is molded while being clamped in a state where the end surfaces are butted together. A two-color injection molded body and a method for producing the same are provided. In addition, the two-color injection molding device, the two-color injection molded body, and the joint boundary surface are not limited to the boundary in which the joint boundary extends linearly but are not disturbed even if the joint boundary extends in a curved shape. A manufacturing method thereof is provided.

  According to the present invention, a molded body that is firmly bonded can be clamped in a state in which the end faces are abutted with each other at a joint portion between two different types of constituent members each having a plate shape by using different resins. A two-color injection molded body that can be molded as it is and a method for producing the same are provided. In addition, the two-color injection molding device, the two-color injection molded body, and the joint boundary surface are not limited to the boundary in which the joint boundary extends linearly but are not disturbed even if the joint boundary extends in a curved shape. A manufacturing method thereof is provided.

  According to the present invention, the end faces are abutted with each other at a joint portion between two different types of constituent members, at least one of which is plate-like, by a (thermoplastic) elastomer and a (thermoplastic) resin harder than the elastomer. Provided are a two-color injection molding device, a two-color injection molding body, and a method for manufacturing the same, which can be molded in a state of being clamped.

  According to the present invention, the end surface is a temperature of the resin at the joint portion between two different structural members, at least one of which is plate-like, by the (thermoplastic) elastomer and the (thermoplastic) resin harder than the elastomer. There are provided a two-color molded body, a manufacturing method thereof, and a two-color injection molding apparatus, which are immediately butted and firmly joined while being clamped when the temperature does not drop to a temperature lower than the softening point.

  The injection-molded article of the present invention is a two-color molded article that is joined in a state in which the end faces of two different types of constituent members, at least one of which is a plate shape, are butted together. Specifically, for example, a container-like object having a side wall or a bottom wall and opening in one direction, such as a container or a protective cover body, is formed in two colors with a boundary surface perpendicular to the wall surface of the bottom wall as a boundary. It is a molded body. Or it is the molded object which shape | molded the molded object which has a plate-shaped part in two colors on the boundary surface located in the plate-shaped part substantially parallel to the thickness direction of the plate-shaped part.

  First, the molding method of the injection molded body of the present invention will be described. In the present invention, the injected first molding material (hereinafter referred to as “resin A”) and the second molding material (hereinafter referred to as “resin B”) are joined in a special plate-shaped cavity described later. To obtain an injection-molded body. The resin A and the resin B can be a polymer itself or a composition containing additives in the polymer.

  In the present invention, a molding apparatus (injection molding apparatus) 2 as shown in FIG. 1 is used. In addition, in this specification, the same code | symbol written over each figure shows the same or similar member and thing. The molding apparatus 2 includes a mold 10 having a cavity 12. The mold 10 includes a movable mold 19, a fixed mold 21, and a base 23 that fixes the fixed mold 21. The cavity 12 has a plate-shaped space portion 18 that is sandwiched between a pair of opposing wall surfaces 25 and 25a and that has an interval h. The space 18 may have a flat plate shape. It may be a plate shape bent three-dimensionally. The space 18 is divided into a first cavity portion 22 and a second cavity portion 24 that communicate with each other at the boundary surface 20 at one end of the first cavity portion 22. Note that the boundary surface 20 represents not a substance but a position. The boundary surface 20 is located on the boundary surface where the injected resin A and the resin B meet and bond together. Further, the boundary surface 20 extends linearly or in a curved shape in a direction along the longitudinal direction of the boundary surface 20.

  Further, the molding apparatus 2 injects the molten resin A into the first injection cylinder 130a for injecting a certain amount of the resin A, the resin flow path 132a for passing the resin A, and the first cavity portion 22. A first injection means 14a composed of a first injection nozzle hole 136a, a second injection cylinder 130b for injecting a certain amount of resin B, a resin flow path 132b for passing resin B, and a second cavity And a second injection means 14b comprising a second injection nozzle hole 136b for injecting the molten resin B into the portion 24.

  As shown in FIG. 2, a recess 42 is formed on the wall surface 25 of the first cavity portion 22. The recess 42 is provided in parallel with the direction along the length of the boundary surface 20. The interval w between the concave stripe 42 and the boundary surface 20 in the surface direction of the wall surface 25 is not more than twice the interval h of the space 18. w may be 0.

  It is preferable that the depth dw and the width zw of the recess 42 are 0.2 to 3 times h. The cross-sectional shape of the recess 42 can be a U-shape or a U-shape, but is not limited to a U-shape or a U-shape.

The molding procedure of the two-color injection molded body of the present invention using the molding apparatus 2 will be described.
In the stage 1 (FIG. 3A), the resin A (7) is injected and injected into the first cavity portion 22 through the first injection nozzle hole 136a, and the resin B (9 ) Is injected and injected through the second injection nozzle hole 136b.

  Next, in the stage 2 (FIG. 3B), the tip 11 of the resin A (FIG. 3A) reaches the tip 17 of the first cavity portion 22, that is, the boundary surface 20.

  Next, in the stage 3 (FIG. 3C), the tip 13 of the resin B reaches the tip of the second cavity portion 24, that is, the boundary surface 20, and the tip 11 of the resin A reaches the boundary surface 20 (FIG. 3A). )) To meet and interview.

  FIG. 3D shows a portion corresponding to the vicinity of the boundary surface 20 (the bonding boundary surface 52 of the plate portion 58) of the two-color injection-molded body molded by the above-described molding procedure using the mold having the cavity 12. The shape of the vicinity. A plate portion 58 is formed by the cavity 12. The plate portion 58 is formed by joining the first component portion 54 and the second component portion 55 made of different molding materials with the bonding boundary surface 52 being in contact with each other at the bonding boundary surface 52. . The first component portion 54 has a rib 62 parallel to the joining boundary surface 52 on one surface 64 of the plate portion 58, and a distance ws between the joining boundary surface 52 and the rib 62 in the surface direction of the wall surface 25 is the plate portion 58. The thickness hs is less than twice the thickness hs. ws may be 0. The joint boundary surface 52 corresponds to the boundary surface 20 (FIG. 2), and ws and hs correspond to w and h, respectively. The rib 62 is formed by the recess 42 (FIG. 19). hs is usually about 1 to 5 mm. The height dws and the width zws of the rib 62 are preferably 0.2 to 3 times hs.

  The time ta from the start of injection of the resin A into the first cavity portion 22 in the stage 1 to the state of the stage 2 is the injection amount v (cc / min) per unit time of the resin A and the first cavity portion 22. Is substantially determined as y / v. The time tb from the start of injection of the resin B into the second cavity portion 24 to the state of the stage 3 is the injection amount v ′ (cc / min) per unit time of the resin B and the capacity of the second cavity portion 24. From y ′ (cc), it is almost determined as y ′ / v ′. Therefore, the time from the stage 2 to the stage 3 can be adjusted by the respective injection start times of the resin A and the resin B.

  In the embodiment of the present invention shown in FIG. 3, the first cavity portion 22 is provided with the flow suppressing portion 201 by the recess 42 on the wall surface 25, so that the flow suppressing portion 201 is injected into the first cavity portion 22. Since the resin A having reached the groove 42 flows into the groove 42 and spreads in the longitudinal direction of the groove 42, the flow of the resin A does not easily flow into the second cavity beyond the boundary surface 20, that is, the flow is suppressed. The portion 201 suppresses the flow of the resin A from the first injection nozzle hole 136a toward the boundary surface 20 in the space 18. Thereby, the front-end | tip of resin A is formed in the direction in alignment with the longitudinal direction of the groove 42 in the vicinity of the groove 42, ie, the boundary surface 20. As shown in FIG. Even if the boundary surface 20 is curved as viewed in its own surface direction, the boundary surface where the bonding boundary surface between the resin A and the resin B is parallel to the direction along the longitudinal direction of the recess 42 in the steps from the stage 1 to 3. 20 is easily formed without being disturbed in shape. The flow suppressing unit 201 includes a space expanding unit 202 in which the space 18 is expanded.

  Since w is equal to or less than twice the interval h of the space 18, the tip of the resin A is parallel to the longitudinal direction of the recess 42 in the vicinity of the recess 42 or in a position in contact with the recess 42. Is formed without being disturbed. This position is the position of the boundary surface 20. In the present invention, since the tip of the discharged resin A is substantially parallel to the direction along the length of the recess 42 due to the presence of the recess 42, the position of the boundary surface 20 is one of the resin A. It is determined by the shot injection amount and the capacity of the first cavity portion 22. If w is increased beyond twice the interval h of the space 18, the shape of the tip of the resin A is disturbed, and the position of the boundary surface 20 is disturbed and is not fixed.

In the present invention, the time t from the state of the stage 2 to the state of the stage 3, that is, from the time when the front end of the resin A reaches the front end of the first cavity portion 22, that is, the boundary surface 20, the front end of the resin B is the resin. The time t until reaching the tip of A is less than the melting point of the resin A since the temperature of the tip of the resin A decreases from the time when the tip of the resin A reaches the tip of the first cavity portion 22, that is, the boundary surface 20. It is preferable that the time is tr until a predetermined temperature equal to or higher than the softening point of the resin A is reached. Softening point is JIS
It is the softening point temperature measured according to K-7206.

  When both the resin A and the resin B are associated in the molten state, the boundary surface is unstable and easily collapses. However, the resin A is at the timing when the front end of the softened resin A and the front end of the molten resin B meet below the melting temperature. When the resin B and the resin B are joined, the tip of the resin A having a certain degree of hardness, not a molten state, and the resin B in a molten state can be associated with each other. ) Is almost never collapsed. Furthermore, since the temperature of the front-end | tip part of resin A at the time of an association is more than a softening point, even if it joins dissimilar polymers, strong joint strength can be obtained after cooling. For example, even if the resin A is made of a relatively hard resin having a softening point above normal temperature such as polypropylene (hereinafter referred to as PP), and the resin B is made of a thermoplastic elastomer, a strong bonding strength can be obtained. Can do.

  In this case, the temperature of the tip portion of the resin A and its change with time are determined by drilling a measurement hole in the mold 10, bringing the tip of the measurement hole as close as possible to the boundary surface 20, and inserting a thermocouple into the measurement hole. By measuring the change in temperature over time, it can be approximated. This measurement may be performed using a mold model without using an actual machine. Or you may obtain | require by the simulation by the fluid analysis calculation which analyzes the time course of the flow of a three-dimensional fluid, and the temperature of each site | part. Tr can be obtained from this change with time.

  The injection timings of the resin A and the resin B that realize such meeting timing can be set from ta, tb, and tr.

  Also, without measuring the resin temperature at the tip, test molding is performed by gradually changing the difference td between the injection start time of resin A and the injection start time of resin B, and the optimum td is determined with respect to the bonding strength. You can also For example, when the resin A and the resin B reach the boundary surface 20 at the same time, td is obtained from ta and tb and is set to tds, the injection is performed at a time lag of 10 to 20 steps in steps of about 0.5 seconds from tds. The optimum td can be determined based on the test.

  Thus, in the present invention, in the space 18, the interior of the space 18 of the resin A is directed from the first injection nozzle hole 136 a toward the boundary 20 in parallel with the direction along the length of the boundary 20. By providing a long and narrow flow suppressing portion 201 as shown in FIG. 3A that suppresses the flow that advances, the tip of the resin A can be aligned with the boundary surface 20 in one shot.

  As shown in FIG. 4, the interval enlarging unit 202 constituting the flow suppressing unit 201 may be an interval enlarging unit 202 a formed by a pair of concave ridges 42 aa and 42 bb facing each other. Moreover, the flow suppression part 201aa by the elongate narrow part 206 which the space | interval of the space part 18 reduced by the protruding item | line 66 as shown to Fig.5 (a) may be sufficient. The narrow portion 206 suppresses the flow of the resin A from the first injection nozzle hole 136a toward the boundary surface 20 in the space 18. The distance kkb between the narrow portion 206 and the boundary surface 20 in the surface direction of the wall surface 25 is preferably not more than twice the h in order to obtain a joint boundary surface with less disturbance. The width (in the thickness direction of the cavity) khb of the narrow portion 206 is preferably 0.2 to 0.9 times h, in order to obtain a bonded interface with little disturbance. The width xwb of the ridge 66b is preferably 0.2 to 3 times h, in order to obtain a bonded interface with little disturbance. The flow suppressing portion 201aa is formed by the ridge 66.

  As shown in FIG. 5B, the narrow portion may be a narrow portion 206a (flow restraint portion 201aaa) formed by opposed protruding ridges 66p and 66q.

  The flow suppression unit 201b may be a flow suppression unit 201b including a stepped portion 208 that rises from the wall surface as illustrated in FIG. Furthermore, the flow suppression part 201c by the baffle plate 212 as shown in FIG. 7 may be sufficient. Or the flow suppression part 201d which consists of the bending part 214 bent in a substantially U shape in the direction orthogonal to the boundary surface 20 as shown in FIG. 8 may be sufficient.

  If the flow suppression part is a single groove or a single protrusion, when the injection pressure is relatively high, the tip of the resin may flow out beyond the flow suppression part. If the injection pressure is low, the resin may not spread all over the cavity. As shown in FIGS. 9 (a) and 9 (b), the flow suppressing portion is made into the flow suppressing portions 201pp and 201ppp in which the concave stripes 42 and the convex stripes 66 are combined, so that there is no disturbance even if the injection pressure is high. A joining interface is obtained. Further, as shown in FIG. 9 (c), the flow suppressing portion 201pq in which a pair of concave stripes 42q and 42qq are arranged in close proximity, and as shown in FIG. The provided flow suppression unit 201qp may be used.

  Further, in the present invention, if the injection pressure is high, the state of the resin tip with little disturbance along the boundary surface 20 may be difficult to be realized. However, as shown in FIG. By providing a plurality of them so as to be parallel to each other at a predetermined interval, the resin traveling in the direction of the arrow Y is aligned every time it reaches the flow suppressing portion, so that even if the injection pressure is high It is possible to obtain a joint interface with very little disturbance. In addition, the code | symbol 201x generally shows the flow suppression part. It is preferable for obtaining the joining boundary surface with less disturbance that the distances hp1, hp2, hp3,... Between the adjacent flow suppressing portions 201x are 1h to 10h.

  If an example of the two-color injection molded body of the present invention molded using the molding apparatus 2 is given, as shown in FIG. 11, the injection molded body 50 is a container-like shape having an opening 47 opened in one direction. The first component 54 and the second component 55 made of molding materials different from each other are bonded to each other with the end surfaces being in contact with each other with a bonding boundary surface 52 substantially perpendicular to the wall surface as a boundary. The joining boundary surface 52 passes through the peripheral wall 56 from one position p of the edge of the injection-molded body 50 toward the bottom wall surface 49 while curving along the bottom wall surface 49, and the peripheral wall 57 facing the peripheral wall 56. And extends to reach another position q of the edge of the injection molded body 50 relative to the position p. A portion in the vicinity of the joint boundary surface 52 of the injection molded body 50 is a plate portion 58. In the embodiment shown in FIG. 11, the shape of the plate portion 58 is a curved plate shape, but the plate portion 58 may be a flat plate shape depending on the type of the molded body. A flat part may be included.

  The first component portion 54 has a rib 62 parallel to the joining boundary surface 52 on one side 64 of the plate portion 58 (here, the wall surface of the injection molded body 50).

  The rib 62 may be formed on the outer wall surface of the injection molded body 50 by changing the shape of the cavity 12.

  As described above, the injection molded body 50 has the joining boundary surface 52 formed in a predetermined shape along the longitudinal direction of the rib 62 without being disturbed, and the rib 62 causes the first portion in the vicinity of the joining boundary surface 52 to be formed. The bending rigidity of one component 54 is reinforced. In particular, when the first component 54 is made of a relatively hard resin having a softening point above normal temperature such as PP, and the second component 55 is made of an elastomer, this reinforcement is applied to the entire injection molded body 50. It is effective for ensuring dimensional stability against external force. In order to smooth the outer wall surface of the injection molded body 50, it is preferable that the rib 62 is provided on the wall surface of the injection molded body 50 as shown in FIG.

  In another aspect of the present invention, as shown in FIG. 12A, a groove 42 is formed on the wall surface 25 of the first cavity portion 22a of the cavity 12a, and the second cavity is formed from the groove 42. The portion 24a is formed with a ridge 66a along the longitudinal direction of the ridge 42, and the distance da between the ridge 66a and the ridge 42 in the surface direction of the wall surface 25 is set to be twice or less h. Yes. The flow suppression portion 2015a is formed by the concave stripe 42, and the flow suppression portion 2015b is formed by the convex stripe 66a.

  The cavity 12a is divided into a first cavity portion 22a and a second cavity portion 24a with the boundary surface 20 as a boundary. An elongated narrow portion 70 is formed along the longitudinal direction of the boundary surface 20a on the side of the cavity 12a from the recess 42 toward the second cavity portion 24a by the protrusion 66a. The distance ka (= da) between the narrow portion 70 and the recess 42 in the surface direction of the wall surface 25 is preferably not more than twice the distance h of the space portion 18 in order to obtain a joint boundary surface with less disturbance. ka may be 0. The height hw of the ridge 66a is preferably 0.1 to 0.7 times h, in order to obtain a joint interface with little disturbance. The width xw of the ridge 66a is preferably 0.2 to 3 times h, in order to obtain a joint interface with little disturbance. The width kh of the narrowed portion 70 is preferably 0.2 to 0.9 times h, in order to obtain a bonded interface with little disturbance. The boundary surface 20a is located below or near the ridge 66a. The distance wx between the boundary surface 20a and the recess 42 in the surface direction of the wall surface 25 is preferably not more than twice h.

  In such an embodiment, the protrusion 66a prevents the resin flow and spreads in the longitudinal direction of the boundary surface 20 together with the above-described effect of the recess 42 with respect to the entrance of the resin A, so that the flow of the resin A is the boundary. The second cavity 24a is less likely to flow into the alligator beyond the surface 20, and the joint surface (boundary surface 20) between the resin A and the resin B is easily formed without being disturbed in an orderly manner.

  FIG. 12B shows the shape of the portion corresponding to the vicinity of the boundary surface 20 of the two-color injection-molded article of the present invention formed by the configuration of the cavity 12a (in the vicinity of the joining boundary surface 52a of the plate portion 58a). . The plate portion 58a is formed by joining the first constituent portion 54a and the second constituent portion 55a made of different molding materials with the joining boundary surface 52a being in contact with each other at the joining boundary surface 52a. . The first component portion 54a has a rib 62a parallel to the joining boundary surface 52a on one surface 64a of the plate portion 58a, and the interval ws between the joining boundary surface 52a and the rib 62a in the surface direction of the wall surface 25 is The thickness is not more than twice the thickness hsa. ws may be 0. The first component portion 54a and the second component portion 55a are bonded to each other at the bonding boundary surface 52a with their end surfaces facing each other. The rib 62a is formed by the concave strip 42, and a groove 99a parallel to the rib 62a is formed by the convex strip 66a. An interval between the elongated thin portions 78a parallel to the ribs 62a and the ribs 62a formed by the grooves 99a and the ribs 62a in the surface direction of the wall surface 25 is less than twice the hsa. It is preferable in obtaining. ma may be 0. The thickness ns of the thin portion 78a is preferably 0.2 to 0.7 of hsa.

  FIG. 13 shows an example of the two-color injection molded product of the present invention molded by the configuration of the cavity 12a shown in FIG. The shape of the injection-molded body 50a shown in FIG. 13 is substantially the same as the shape of the injection-molded body 50 shown in FIG. 11, but the first component 54a has ribs 62a parallel to the joint boundary surface 52a on one side of the plate portion 58a. 64a, and the interval between the bonding boundary surface 52a and the rib 62a in the surface direction of the wall surface 25 is zero. The joint boundary surface 52 a corresponds to the boundary surface 20. The first component portion 54a and the second component portion 55a are bonded to each other at the bonding boundary surface 52a with their end surfaces facing each other. The rib 62a is formed by the concave strip 42, and the groove 99a and the thin portion 78a are formed by the convex strip 66a. In the injection molded body 50a, the first component 54a is made of resin A, and the second component 55a is made of resin B. Resin A is a resin having relatively high rigidity such as PP, and resin B is made of an elastomer.

In the injection molded body 50a, the rib 62a reinforces the bending rigidity of the first component portion 54a in the vicinity of the bonding boundary surface 52a, and the first configuration is made of the thin portion 78a for obtaining a bonding boundary surface with very little disturbance. It functions effectively also to reinforce the decrease in rigidity of the portion 54a.
Further, since the thin portion 78a is present, when the second component 55a receives an external force, the second component 55a is bent and deformed intensively at the portion of the thin portion 78a. The other part of 55a can be relatively maintained in its original form despite receiving external force.
That is, when external force is locally received, the second component 55a is not greatly deformed, for example, only the portion receiving the external force is locally recessed, but the second component 55a is the original as the entire second component. It can be bent and deformed intensively at the thin portion 78a while maintaining the curved surface shape approximately.

  FIG. 14 shows another example of the two-color injection-molded article of the present invention molded by the configuration of the cavity 12a shown in FIG. The shape of the injection molded body 50f shown in FIG. 14 is a rectangular box shape that opens upward as a whole, and a substantially rectangular plate portion 92 (second component portion 55f) made of resin B is formed on a part of one side wall 90. Have. The portion excluding the second component 55f of the injection molded body 50f is the first component 54f. The plate portion 92 is located above the center of the one side wall 90 and shares the upper edge with a part of the upper edge of the one side wall 90. The portion 94 excluding the plate portion 92 of the injection molded body 50f is made of resin A. Resin A is a resin having relatively high rigidity such as PP, and resin B is made of an elastomer. The joining boundary surface 52f, the rib 62f, and the elongated thin portion 78f are each extended in parallel to the peripheral edge of the plate portion 92 along the peripheral portion except the upper edge of the plate portion 92. The aspect of the mutual distance relation and the relation of the mutual sizes of the joining boundary surface 52f, the rib 62f, the elongated thin part 78f, and the thickness of the one side wall 90 is the same as the aspect in FIG.

  FIG. 15 schematically shows a main part of a mold 100 (movable mold 119 and fixed mold 121) for molding the injection molded body 50f. The mold 100 includes a cavity 12f, and the cavity 12f is divided into a first cavity portion 22f and a second cavity portion 24f with a boundary surface 20f as a boundary.

  A concave line 42f is formed on the wall surface 25f of the first cavity part 22f, and a convex line 66f is formed along the longitudinal direction of the concave line 42f from the concave line 42f to the second cavity part 24f. . The mutual positional relationship and size relationship among the ridge 66f, the concave ridge 42f, and the boundary surface 20 are the same as those in the cavity 12a shown in FIG.

  The movable mold 119 includes three parts, ie, a part 119a, a part 119b, and a part 119c, for die cutting.

  Furthermore, as shown in FIG. 16, the mold cavity used in the present invention has ridges 66b formed on the wall surface 25a of the cavity 12b opposite to the wall surface 25 on which the ridges 42 are formed. A narrow portion 70b may be formed. The cavity 12b is divided into a first cavity portion 22b and a second cavity portion 24b with the boundary surface 20 as a boundary. The distance db between the protrusion 66b and the recess 42 in the surface direction of the wall surface 25 is set to be twice or less h. An elongated narrow portion 70b is formed along the longitudinal direction of the boundary surface on the side of the cavity 12b from the recess 42 to the second cavity portion 24b. The distance kb (= db) between the narrow portion 70b and the recess 42 in the surface direction of the wall surface 25 is preferably not more than twice as long as h in order to obtain a joint boundary surface with less disturbance. The width khb of the narrowed portion 70b is preferably 0.2 to 0.9 times h, in order to obtain a bonded interface with little disturbance. The width xwb of the ridge 66b is preferably 0.2 to 3 times h, in order to obtain a bonded interface with little disturbance. A flow suppressing portion 2015c is formed by the ridge 66b.

  Alternatively, as shown in the cavity 12c shown in FIG. 17, the narrow surface 70c may be formed by providing the convex wall 66c and the convex line 66d on the wall surface 25 where the concave line 42 is formed and the wall surface 25a. The cavity 12c is divided into a first cavity portion 22c and a second cavity portion 24c with the boundary surface 20 as a boundary. In order to obtain a joint boundary surface with less disturbance, it is preferable that the distance kc between the narrow portion 70c and the recess 42 in the surface direction of the wall surface 25 is not more than twice as large as h. The width khc of the narrowed portion 70c is preferably 0.2 to 0.9 times h, in order to obtain a joint interface with little disturbance. The widths xwc and xwd of the ridges 66c and 66d are preferably 0.2 to 3 times h, in order to obtain a joint boundary surface with less disturbance. The flow restricting portion 2015d is formed by the narrow portion 70c.

  Alternatively, as in the cavity 12d shown in FIG. 18, the recess 42 is formed in the first cavity portion 22d of the wall surface 25, and the recess 43 is formed in the second cavity portion 24d of the wall surface 25. May be formed. The recess 43 is arranged in parallel with the recess 42, and its shape and size are similar to those of the recess 43. The distance w2 between the concave line 43 and the boundary surface 20 in the surface direction of the wall surface 25 is equal to or less than twice h. The flow suppressing portion 2015e is formed by the concave stripe 43.

  In this embodiment, the shape of the tip of the resin A is aligned along the boundary surface 20 by the recess 42, and the shape of the tip of the resin B is aligned along the boundary surface 20 by the recess 43. The joining surface is aligned along the boundary surface 20 and the disturbance is extremely small.

  Furthermore, as shown in FIG. 19, in addition to the mode shown in FIG. 18, a cavity 12e in which a narrow portion 70d by a protruding line 66e is provided at the position of the boundary surface 20 may be used. The flow restricting portion 2015f is formed by the narrow portion 70d.

  Further, like the cavity 12g shown in FIG. 20, a second groove 44 may be provided adjacent to the groove 42 in addition to the embodiment of the cavity 12 shown in FIG. The second groove 44 is provided in parallel with the groove 42, as viewed from the groove 42 and away from the second cavity portion 24. A flow restricting portion 2015g is formed by the second recess 44. The distance dd between the concave line 42 and the second concave line 44 in the surface direction of the wall surface 25 is not more than twice h. It is preferable that the depth ddw and the width dzw of the groove 44 are 0.2 to 3 times h. This aspect is preferable because the joint surface of the joint boundary surface of the injection molded body is less disturbed than the aspect of the cavity 12 shown in FIG.

  Furthermore, a second groove 44 may be provided adjacent to the groove 42 in addition to the form of the cavity 12a illustrated in FIG. The second groove 44 is provided in parallel with the groove 42, as viewed from the groove 42 and away from the second cavity portion 24. The distance dd between the concave line 42 and the second concave line 44 in the surface direction of the wall surface 25 is not more than twice h. This aspect is preferable because the joint surface of the joint boundary surface of the injection molded body is less disturbed than the aspect of the cavity 12 shown in FIG.

  2, 12, 18, 19, 20, and 21 are preferable to the modes shown in FIGS. 16 and 17 in order to make the single wall surface of the injection-molded body smooth.

  Further, in the present invention, the recess 42 is provided on the wall surface 25, but in addition, it may be provided on the wall surface 25 a facing the wall surface 25.

  Furthermore, in this invention, as shown in FIG. 22, the 2nd cavity part 24 has the other space part 18bb of the plate shape pinched | interposed into a pair of opposing wall surface 25b, 25bb, and other space part 18bb The first cavity portion 22 may be communicated with the boundary surface 20 which is one end of the first cavity portion 22.

  Furthermore, as shown in FIG. 23, the flow of the second molding material toward the boundary surface 20 in the other space portion 18 bb is suppressed in the other space portion 18 bb, and along the length of the boundary surface 20. In order to obtain a joint boundary surface with less disturbance, it is preferable to provide the other narrow flow suppressing portion 201y parallel to the direction. In addition, when the distance between the pair of wall surfaces 25b and 25bb is h ', the distance wk between the other flow control part 201kk closest to the boundary surface 20 and the boundary surface 20 in the surface direction of the wall surface 25b is It is preferable in order to obtain a bonding boundary surface with little disturbance to be 0-2h ′. By providing a flow restraint (other flow restraint 201y) in another space of the second cavity in addition to the space of the first cavity, the properties such as the melt viscosity of the resin A and the resin B are different from each other. Even in this case, a uniform boundary surface can be obtained.

  FIG. 24 shows the shape in the vicinity of the joint of the injection molded product of the present invention molded by the cavity 12b shown in FIG. In FIG. 24, the first component portion 54b has a rib 62b parallel to the joining boundary surface 52b on one side 64b of the plate portion 58b, and the distance between the joining boundary surface 52b and the rib 62b in the surface direction of the plate portion 58b. It is preferable that wgb is not more than twice the thickness hsb of the plate portion 58b in order to obtain a bonding interface with little disturbance. The joint boundary surface 52b corresponds to the boundary surface 20, and wgb and hsb correspond to w and h, respectively. The first component portion 54b and the second component portion 55b are bonded to each other at the bonding boundary surface 52b with their end surfaces facing each other. The rib 62b is formed by the concave strip 42, and a groove 99b parallel to the rib 62b is formed by the convex strip 66b. An interval mb between the rib 62b and the groove 99b in the surface direction of the plate portion 58b corresponds to db. In order to obtain a joint boundary surface with less disturbance, it is preferable that the distance mb in the surface direction of the plate portion 58b between the elongated thin portion 78b formed by the groove 99b and the rib 62b is not more than twice hsb. .

  FIG. 25 shows the shape in the vicinity of the joint of the injection molded product of the present invention molded by the cavity 12c shown in FIG. In FIG. 25, the first component 54c has a rib 62c parallel to the joining boundary surface 52c on one side 64c of the plate portion 58c, and the distance between the joining boundary surface 52c and the rib 62c in the surface direction of the plate portion 58c. wsc is less than or equal to twice the thickness hsc of the plate portion 58c. The bonding boundary surface 52c corresponds to the boundary surface 20, and wsc and hsc correspond to w and h, respectively. The first component portion 54c and the second component portion 55c are bonded to each other at the bonding boundary surface 52c with their end surfaces facing each other. The rib 62c is formed by the concave strip 42, and a groove 99c and a groove 99d parallel to the rib 62c are formed by the convex strip 66c and the convex strip 66d, respectively. An elongated thin portion 78c parallel to the rib 62c is formed by the groove 99c and the groove 99d. The distance mc between the rib 62c and the thin portion 78c in the surface direction of the plate portion 58c is preferably equal to or less than twice hsc in order to obtain a joint boundary surface with less disturbance.

  FIG. 26 shows the shape in the vicinity of the joint of the injection molded body 50d of the present invention molded by the cavity 12d shown in FIG. In FIG. 26, the first component 54d has a rib 62d parallel to the joining boundary surface 52d on one surface 64d of the plate portion 58d, and the distance between the joining boundary surface 52d and the rib 62d in the surface direction of the plate portion 58d. wsd is not more than twice the thickness hsd of the plate portion 58d. The first component portion 54b and the second component portion 55b are bonded to each other with their end surfaces facing each other at the bonding boundary surface 52d. The bonding boundary surface 52d corresponds to the boundary surface 20, and wsd and hsd correspond to w and h, respectively. The rib 62d is formed by the recess 42. The second component portion 55d has a rib 63d parallel to the joining boundary surface 52d on one surface 64dd of the other plate portion 59d, and the space wsd2 between the joining boundary surface 52d and the rib 63d in the surface direction of the plate portion 58b is set. It is assumed that it is 2 times or less of hsd. The rib 63d is formed by the recess 43.

  FIG. 27 shows the shape in the vicinity of the joint of the injection molded product 50e of the present invention molded by the cavity 12e shown in FIG. 27, in addition to the embodiment shown in FIG. 26, an elongated thin portion 78d parallel to the rib 62d is formed at the position of the joint boundary surface 52e.

  FIG. 28 shows the shape in the vicinity of the joint of the injection molded body 50g of the present invention molded by the cavity 12g shown in FIG. In FIG. 28, the second rib 65 is provided adjacent to the rib 62 in addition to the embodiment shown in FIG. The second rib 65 is provided in parallel with the rib 62, as viewed from the rib 62, but away from the second structure portion 55. The distance dds between the rib 62 and the second rib 65 in the surface direction of the plate portion 58b is not more than twice the thickness hs of the plate portion 58b. The height ddws and width dzws of the second rib 65 are preferably 0.2 to 3 times hs.

  FIG. 29 shows the shape in the vicinity of the joint of the injection molded body 50h of the present invention molded by the cavity 12h shown in FIG. 29, in addition to the mode shown in FIG. 12B, a second rib 65 is provided adjacent to the rib 62a. The second rib 65 is provided in parallel with the rib 62a while being away from the second structure portion 55 as viewed from the rib 62a. The distance dds between the rib 62a and the second rib 65 in the surface direction of the plate portion 58a is not more than twice the thickness hsa of the plate portion 58a. The height ddws and the width dzws of the second rib 65 are preferably 0.2 to 3 times hsa.

In addition, a plurality of thickness change portions are formed on the plate portion of the injection molded body obtained by the molding apparatus having the plurality of flow suppression portions 201x shown in FIG. 10 corresponding to the respective flow suppression portions 201x. For example, as shown in the injection molded body 50x in FIG. 30, in which the first component 54x and the second component 55x are joined at the joining boundary surface, a plurality of thickness changing portions 222x by the ribs 62x are formed. The An interval (wx1, wx2, etc.) between the adjacent thickness change parts 222x may be 1h _{0 to} 10h ₀ .

  A plurality of thickness change portions are formed on the plate portion of the injection molded body obtained by the molding apparatus having the plurality of flow suppressing portions 201x and 201y corresponding to the respective flow suppressing portions 201x and 201y.

  In addition, in the figure, for convenience of explanation, the bonding boundary surface (such as the bonding boundary surface 52) of the injection-molded body obtained in the present invention is a direction along the length of the plate portion (the plate portion 58 or the like). The orthogonal cross-sectional shape is displayed in a straight line parallel to the thickness direction of the plate part, but in reality, this cross-sectional shape may be curved or inclined with respect to the thickness direction of the plate part. is there.

  In particular, in the cavity of the embodiment shown in FIG. 12, FIG. 13, FIG. 5 (a), or FIG. 5 (b), this cross-sectional shape is a convex curve from the first structure portion toward the second structure portion. A joint interface that is in the shape of That is, the injection molding apparatus according to the present invention using the cavity 12sp (not shown) except for the closest flow suppressing portion (not shown) in which the flow suppressing portion closest to the boundary surface 20 is formed with the ridge 66 on the boundary surface 20 shown in FIG. First, as shown in FIG. 32, when the resin A (reference numeral 77) gets over the ridge 66, the resin A rapidly spreads in the thickness direction of the space 18, and the tip portion 150 of the resin A is formed. (FIG. 32 (a)). The shape of the cross section orthogonal to the direction along the length of the ridge 66 of the tip 150 is a curved shape that protrudes from the first cavity portion 22 toward the second cavity portion 24. The shape of this curve is not necessarily symmetrical, and is often a curve in which a bulge hangs downward in the drawing, that is, in the direction of the wall surface 25a. That is, a wedge-shaped gap 152 is formed between the tip portion 150 and the wall surface 25 a, a gap 154 is formed between the tip portion 150 and the wall surface 25, and the gap 152 is often narrower than the gap 154. The tip 158 of the gap 154 is located at a step 159 portion of the wall surface 25 formed by the ridge 66 and extends in the direction along the length of the ridge 66. The apex 160 of the gap 152 is in a state where the tip 158 of the step 159 is directly below the plan view, that is, approximately at a position projected onto the wall surface 25a from the rising 158 in a direction orthogonal to the surface of the wall surface 25.

  Next, when the tip of the resin B (reference numeral 79) reaches the tip 150 of the resin A, the resin B enters the gap 152 and the gap 154 at the tip (FIG. 32B). Since the tip portion 150 is not cooled and is still in a softened state, the tip portion 150 is pushed in the direction of the wall surface 25 by the pressure of the resin B that has entered the gap 152, and the pressure of the resin B that has entered the gap 154 Due to the balance, the cross-sectional shape of the distal end portion 150 becomes a substantially symmetrical mountain shape between the wall surface 25 and the wall surface 25a. Further, the resin B is filled in the gaps 154 and 152 by the resin pressure. As a result, as shown in FIG. 33, an injection-molded body 50sp with a small disturbance of the joining interface is obtained.

  The injection molded body 50sp includes a first structure portion 54sp and a second structure portion 55sp. The first structure portion 54sp includes a plate portion 58sp, and the second structure portion 55sp includes another plate portion 59sp. The front end of the plate portion 58sp and the front end of the plate portion 58spp are joined via the joining boundary surface 52sp. A groove 99sp is formed on one surface 64sp of the plate portion 58sp. The joint boundary surface 52sp has a chevron shape that is convex in the direction of the second component 55sp, and the other plate portion 59sp is bifurcated at the tip portion, so that one tip portion 88sp and another wedge-shaped tip portion 88spp are formed. Is formed. The tip 89sp of one tip 88sp is in contact with the portion 90sp of the groove 99sp near the second structure portion 55sp, and the tip 89spp of the other wedge-shaped portion 88spp is opposite to the one surface 64sp of the plate portion 58sp. It is in contact with the other surface 64spp. The apex 89spp is substantially present at a position directly below the apex 89sp in the drawing, that is, at a position projected from the opening edge 90sp of the groove 99sp to the other surface 64spp in the thickness direction of the plate portion 58sp.

  In another aspect, in addition to the aspect shown in FIG. 31, another protrusion may be provided on the wall surface 25 a so as to face the protrusion 66.

  In addition, in the cavity 12ssp shown in FIG. 31, when the concave stripes 42 are provided adjacent to the convex stripes 66 as in the cavity 12a shown in FIG.

  In the injection molded body 50sp or the like, other ribs and other grooves are formed on the plate portion 58s in parallel with the direction along the length of the bonding interface, opposite to the bonding interface with respect to the groove 99. It may be.

  In the present invention, as shown in FIG. 34, the injection molding in which the plate portion 58z (first component portion 54z) and the plate portion 59z (second component portion 55z) face each other with the joint boundary surface 52z interposed therebetween. In the configuration of the body 50z, a thin portion 78z due to the groove 99z may be formed on the plate portion 58z, and a thin portion 78zz due to the groove 99zz may be formed on the plate portion 59z. In such a configuration, when the portion existing between the thin portion 78z and the thin portion 78zz is the intermediate portion 300z, when the injection molded body 50z is used and discarded, the thin portion 78z and the thin portion By cutting at 78 zz, the injection molded body 50 z is made of a resin B on the left side in the drawing, an intermediate part 300 z made of the resin B and the resin A, and a resin A on the right side in the drawing. It can be divided into three parts. Thus, a member made of a resin in which different materials are not mixed except for the belt-shaped intermediate portion 300z can be easily obtained, and advanced recycling and reuse of the resin can be easily performed.

  Since the portion of the thin portion 78z and the portion of the thin portion 78zz are less powerful than the other portions, such separation can be easily performed. The thin portion 78z and the thin portion 78zz also serve as guide grooves when cutting with a cutting tool, and enable accurate cutting at that position.

  The thin portion 78z and the thin portion 78zz may each be formed by a single groove, or may be formed by a pair of upper and lower grooves as viewed in the drawing.

  In the present invention, the thickness of the first cavity portion (the first cavity portion 12 or the like) is such that the flow suppressing portion of the resin A that proceeds with respect to the boundary surface 20 of the flow suppressing portion (the flow suppressing portion 210 or the like). It may change along the direction orthogonal to the flow direction of the resin A in the region where there is a wrinkle upstream. In this region, by adjusting the cross-sectional shape of the cross section perpendicular to the flow direction of the resin A in the first cavity portion, the flow of the resin is controlled to further reduce the disorder of the shape of the joint interface. be able to. An example of a preferred cross-sectional shape is shown in FIG. The optimum cross-sectional shape can be selected from various cross-sectional shapes including these depending on the shape of the boundary surface 20.

  Further, the flow suppression of the resin A in which the wall surface (such as the wall surface 25) of the first cavity portion (such as the first cavity portion 12) proceeds with respect to the boundary surface 20 of the flow suppression portion (such as the flow suppression portion 210). The upstream of the portion may be a wrinkled region, and may have an uneven surface portion. This irregular surface can further reduce the shape disorder of the joint boundary surface. The optimum shape, position, width, and uneven shape (surface roughness, pitch, etc.) of the uneven surface can be selected according to the shape of the boundary surface 20.

  Hereinafter, the thickness of the first cavity portion (first cavity portion 12 and the like) is determined so that the upstream of the flow suppression portion of the resin A that proceeds with respect to the boundary surface 20 of the flow suppression portion (flow suppression portion 210 and the like). An experiment example is shown in which the boundary surface 20 is formed in a uniform manner in parallel with the longitudinal direction of the flow restraint portion by changing along the direction orthogonal to the flow direction of the resin A in the region.

Experimental Example Two-color injection molding was performed using a mold 300 shown in FIG. The mold 300 includes a fixed mold 302 and a movable mold 304. A surface 305 of the movable mold 304 facing the cavity 306 is a flat surface, and the fixed mold 302 is a shallow rectangular basin-shaped molded body 340 ( FIG. 39) has a cavity for molding. In FIG. 36, the cavity 306 is schematically shown as a concept.

  FIG. 37 is a plan view of the fixed mold 302 on the cavity side, and FIG. 38 is a sectional end view of each sectional direction of FIG. The fixed mold 302 is formed with a circumferential groove 310 for forming an edge side wall of the molded body, and has a flat surface portion 312 for forming an inner bottom surface of the molded body inside the circumferential groove 310. The flat surface portion 312 is divided into a flat surface portion A and a flat surface portion B with a flow restraining portion 315 formed of a groove 314 and a rib 316 as a boundary. The flow restricting portion 315 is bent from the inside of the flat portion A (bending the flat portion A when the flow restricting portion 315 is traced in the longitudinal direction) and the bent portion 320 and the end portions 322 of the bent portion 320, respectively. A pair of linear portions 324 extending substantially linearly in the longitudinal direction of the portion 320.

  A space 307 that is a component of the cavity 306 is formed between the plane A and the surface 305 of the movable mold 304 facing the cavity 306.

A flat groove A is formed with a control groove 326 for controlling the resin flow.
The control groove 326 extends toward the bent portion 320 in a direction substantially coinciding with the direction of the straight line L corresponding to the symmetry axis of the pair of straight portions 324. Thereby, the space | interval expansion path 330 in which the space | interval of the mutually opposing wall surface of the cavity which faces the plane part A was expanded is formed. Since the resin passing through the gap expansion path 330 has a lower flow resistance than the resin passing through other parts, the flow of the resin is promoted, and the injection of the bent portion 320 located near the tip of the gap expansion path 330 is achieved. The resin can easily reach the vicinity.

  Table 1 shows the dimensions (mm) of each part of the fixed mold 304 used in the experiment.

The extending direction of the control groove 326 may form a predetermined angle with the direction of the straight line L, but preferably substantially coincides with the direction of the straight line L.

Resin-1 (PP (manufactured by Prime Polymer Co., Ltd .: Prime Polypro)) is used as the first molding material from the injection hole (not shown) located in the vicinity of the other end 332 of the gap expansion path 330 in the cavity facing the flat surface portion A. Injecting, resin-2 (thermoplastic elastomer (manufactured by Riken Technos Co., Ltd .: Rheostomer)) as a second molding material is injected into the portion facing the flat portion B of the cavity 306 to perform two-color molding. A two-color molded body (molded body 340) in which the resin-1 and the resin-2 were associated with each other at the boundary surface 360 (FIG. 39) along the longitudinal direction was obtained.

  39 is a plan view showing the obtained molded body 340, and FIG. 40 shows cross-sectional end face shapes in the respective cross-sectional directions of FIG. The molded body 340 includes an edge side wall 354 that goes around the edge of the bottom plate portion 352. The bottom plate portion 352 includes a bottom plate portion A composed of resin-1 (PP) and a bottom plate portion B composed of resin-2 (thermoplastic elastomer). In the bottom plate portion 352, a rib portion 356 is formed by the groove 314, and a groove portion 358 is formed by the rib 316. A boundary surface 360 between the bottom plate portion A and the bottom plate portion B is formed on the bottom plate portion B side along the groove portion 358. Further, a protrusion 362 is formed by a control groove 326 in the bottom plate portion 352.

  As a comparison with this experimental example, a resin-1 having the same shape as that of the fixed mold 302 shown in FIG. 37 but having no control groove 326 formed on the flat surface portion A is used in the same manner as in this experimental example. The shape of a molded body 370 obtained by injecting resin-2 is shown in the plan view of FIG. In the molded body 370, the boundary surface 372 between the resin-1 and the resin-2 is not along the groove portion 358, and is formed so as to get over the groove portion 358 from the resin-2 side toward the resin-1 side. Yes. That is, the injected resin-1 does not reach the bent portion 320 and stays in front of it, and a boundary surface 372 is formed at the position of the tip of the remaining resin-1.

  In the two-color molding using the mold having the curved portion (320) that is bent with the plane portion inward as described above, the interval expansion path (330) formed by expanding the interval width of the space portion to the space portion of the cavity. It is preferable to provide a predetermined boundary surface along the flow restricting portion (315). The shape of the gap expansion path (330) can be optimized depending on the type and viscosity of the resin used. Depending on the type and viscosity of the resin, a uniform boundary surface may be obtained without the gap expansion path (330).

  One interval expansion path (330) may be formed toward the bent portion (320), but a plurality of interval expansion paths (330) may be formed in parallel to each other.

  In order to obtain a predetermined uniform boundary surface along the flow restricting portion (315) in the bent portion (320), other resin flow control means may be provided in addition to the interval expansion path (330). The flow control means may be, for example, a mold in which the temperature of the band-like region extending toward the bent portion 320 of the plane portion A is higher than the temperature of the other regions. Or the metal mold | die in which the surface roughness of the strip | belt-shaped area | region extended toward the bending part 320 of the plane part A was made smaller than the surface roughness of another area | region may be sufficient. Furthermore, it may be a mold having a flat portion A having a high and low profile surface that is optimally simulated so as to obtain a predetermined uniform boundary surface according to the shape of the flow restricting portion (315). It may be a mold having a space portion (18, 307, etc.) of a surface interval profile optimally simulated so as to obtain a predetermined uniform boundary surface according to the shape of the flow restricting portion (315). Furthermore, it may be a mold having a flat surface portion A having a surface temperature profile optimally simulated so as to obtain a predetermined uniform boundary surface according to the shape of the flow restricting portion (315).

  The resin A and resin B used in the present invention are not particularly limited as long as they are materials that can be injection molded. For example, polyethylene resin, polypropylene resin, polystyrene resin, polyamide resin, polyester resin, polyacrylstyrene resin, polyvinyl alcohol resin, polylactic acid resin, ethylene-vinyl acetate copolymer (EVA) ), General-purpose plastics represented by ethylene-vinyl alcohol copolymer (EVOH), ABS resin, AS resin, AES resin, ASA resin, SMA resin, polyalkyl methacrylate resin, polyphenylene ether resin, polyacetal resin, polycarbonate resin Engineering plastics such as aromatic polyester resin, polyamide resin, cyclic polyolefin resin, polyarylate resin (amorphous polyarylate, liquid crystalline polyarylate), polyetheretherke It down, polyetherimide, polysulfone, polyether sulfone, also be used a so-called super engineering plastics such as polyphenylene sulfide. Furthermore, various thermoplastic elastomers can be used. Examples of the thermoplastic elastomer include styrene-butadiene-styrene block copolymer, styrene-isoprene ­ -styrene-butadiene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, and styrene-ethylene-propylene-styrene block copolymer. Polystyrene elastomers; Olefin thermoplastic elastomers; Polydiolefin thermoplastic elastomers such as syndiotactic-1,2 polybutadiene, trans polyisoprene, and natural rubber thermoplastic elastomers; Polyvinyl chloride elastomers, chlorinated polyethylene elastomers, etc. Chlorinated elastomer; polyurethane elastomer; polyester / polyether elastomer, polyester / polyester Polyester elastomers such as water-type elastomers and liquid crystal polyester elastomers; polyamide elastomers; fluoroelastomers; silicone elastomers; polyisobutylenes; acrylic block copolymers; thermoplastic elastomers such as biodegradable elastomers such as polylactic acid Can also be used. Moreover, the copolymer resin containing the structural unit of these resin, the modified resin of these resins, and various polymer alloys may be sufficient. Further, these resins may be mixed and used. Furthermore, it is also possible to use a thermosetting resin (for example, urea resin type, phenol resin type, epoxy resin type) that is cured after injection. Further, it is possible to use a cross-linked elastomer.

  In addition, these injection molding materials are filled with fillers for the purpose of increasing weight, increasing specific gravity, making it conductive, shielding electromagnetic waves, making it stronger, making it flame retardant, antibacterial, photocatalytic antifouling, impact modification, heat resistance, etc. A quantity of resin may be used. As fillers, talc, mica, clay, calcium carbonate, glass beads, carbon beads, glass balloons, graphite, carbon flakes, glass fibers, carbon fibers, ceramic fibers, aramid fibers, metal fibers, metal coated glass fibers, metal coated carbon Fiber, silica, ceramic particles such as silicon carbide, flame retardants such as whiskers, halogens and phosphates, antistatic agents, flow modifiers, crystal nucleating agents, impact modifiers such as graft rubber, etc. Can be mentioned.

  In addition, these injection molding materials include pigments, dyes, phosphorescent pigments, fluorescent pigments, fluorescent dyes, bluing agents, light diffusing agents (acrylic resin particles, silicones) for the purpose of light diffusion, coloring, and fluorescent whitening. System resin particles, glass flakes, calcium carbonate particles, metal flakes, metal-coated glass flakes, etc.) may be added. These injection molding materials also contain plasticizers, UV absorbers, anti-aging agents, foaming agents, antistatic agents, lubricants, crystal modifiers, flame retardants, crosslinking agents, antibacterial agents, fragrances, etc. Also good.

  It is preferable that the resins constituting the two parts in contact with each other are selected so as to be compatible with each other. When selection is restricted due to required characteristics of the product, a compatibilizer may be mixed in each or any of them.

  Furthermore, in the present invention, the two adjacent parts can be molded almost simultaneously with a very short time lag as required. Therefore, it is not necessary to mold one part in advance, and naturally there is no operation for mounting the molded one part on the mold, so that the manufacturing process is greatly shortened compared to the manufacturing method using the insert method, Manufacturing cost can be reduced.

  Further, since it is not necessary to provide a shut-off device that can be opened and closed at the boundary between the two adjacent parts, the device can have a simple structure, and the cost of the device and the maintenance cost of the movable part can be reduced. In addition, since the time required for opening and closing the shut-off device is not required, the molding time is greatly shortened, and the manufacturing cost can be reduced.

  Further, in the present invention, the two parts that are in contact with each other are hit almost simultaneously in one cycle as described above, and one is kept in a molten state while the other is kept in a softened state at a temperature close to the molten state and joined and joined. Therefore, the difference in shrinkage between the two is eased at the time of joining, and it is difficult for the product to warp, the leakage of the resin, and the difference in size due to the difference in shrinkage between the two, and a high joining strength is obtained.

  On the other hand, in the conventional insert molding, the resin injected in the injection process toward the insert work contracts during cooling, so that there is a shrinkage difference in the cooling process after the injection process between the insert work and the resin. Even if the wall surface of the cavity portion for the insert work and the cavity portion for the injection resin is flush, there is a problem that a step, a gradient, or a burr occurs on the surface of the molded body.

  Further, in the conventional two-color molding, after the first resin is injected, the second resin is injected after the boundary mold portion is retracted. Since this retreat takes time, the first resin contracts in the cavity, and a gap is easily formed between the cavity and the first resin, and the second resin easily enters the gap.

  The injection-molded article of the present invention takes advantage of its characteristics, for example, a single die having a member composed of a combination structure of an elastomer and a resin harder than the elastomer such as PP or ABS (acrylonitrile / butadiene / styrene resin). Can be obtained by a one-cycle injection molding process. Thereby, it can use suitably as an interior material used for a vehicle seat, an instrument panel, a door trim, or the like. Examples of the hard resin include the aforementioned engineering plastics, engineering plastics, and super engineering plastics. This hard resin has a softening point above room temperature. The softening point is the Vicat softening point and is determined in accordance with JISK7206. In this case, in the present invention, it is preferable to use a hard resin as the first molding material and an elastomer as the second molding material in order to obtain a uniform interface, but an elastomer as the first molding material, A hard resin may be used as the second molding material.

  As an example of a specific application, the cover can be deformed following the displacement of the steering column for adjusting the position of the handle by disposing a structure made of elastomer in the cover of the steering column of the handle. . Alternatively, by disposing a structure portion made of an elastomer on the cover portion of the ratchet gear on the side of the seat, it is possible to prevent the backrest from being rubbed and scratched when the backrest is swung.

  Furthermore, the injection-molded article of the present invention can be suitably used not only as a vehicle interior material but also as a structural material having a combined structure of different materials for vehicles.

  Furthermore, the use of the injection-molded article of the present invention includes body members, furniture, tools, and structural members of machinery for home appliances such as air conditioners and televisions. As an example, the armrest of a chair type massage machine, the main body is a first component part made of hard resin such as PP or ABS to realize rigidity and light weight, and functionality such as elastomer with excellent touch and flexibility A member made of a two-color composite molded product using the material as the second component can be obtained by a one-cycle injection molding process using a single mold.

  In the molding apparatus shown in FIG. 1, a casing model of the vehicle chair having the shape shown in FIG. 13 assuming a vehicle chair was molded using a mold having a cavity shown in FIG. The size of the model was 200 × 120 × 35 (mm: length × width × height). h = 2.5, zw = 1.0, dw = 1.0, w = 1.5, ma = 0, kh = 1.0, and xw = 1.5. The injection timing of the resin A and the resin B was set based on the above-described ta, tb, tr and the change with time of the temperature in the vicinity of the boundary surface 20 of the resin A.

  PP (Novatec PP BC02A manufactured by Nippon Polychem Co., Ltd.) as resin A was melted at 195 ° C. with a screw leading to the first injection cylinder 130a. As the resin B, a thermoplastic elastomer (Kuraray Septon CJ001N) was used. Resin B was melted at 220 ° C. with a screw leading to the second injection cylinder 130b.

  Resin A is injected into the first cavity portion 22a through the first injection nozzle hole 136a, and then the resin B is injected into the second cavity portion 24a through the second injection nozzle hole 136b. A color injection molded body was formed. The temperature immediately before the resin B reaches the tip of the resin A was measured by inserting a thermocouple into the injection timing of the resin A and the resin B, ta, tb, and the perforations provided in the mold 10, and the boundary surface 20 The temperature was found to be about 150 ° C. based on the change with temperature in the vicinity.

  After the resin B was injected, the mold was cooled and opened to obtain a vehicle chair cover structure model made of a composite molded product of PP and thermoplastic elastomer. Bonding at the bonding interface 52a was strong, and the bonding interface 52a was hardly disturbed.

  As described above, the present invention relates to a molded body and a molding apparatus for the molded body that are joined in a state in which the end surfaces of two different types of constituent members are butted together at the joint. The molded body may have a plurality of joints. That is, the constituent member made of resin-1 and the constituent member made of resin-2 are joined at one joint portion, and the constituent member made of resin-1 and resin-2 or resin at a joint portion different from the one joint portion. -3 constituent members may be joined. Alternatively, the constituent member made of resin-1 and the constituent member made of resin-2 are joined at one joint, and the constituent member made of resin-3 and the resin-4 at a joint different from the one joint. The component member which becomes may be joined.

It is a cross-sectional schematic diagram which shows an example of the aspect of the shaping | molding apparatus used in this invention. It is a figure explaining the shape of the cavity in the shaping | molding apparatus shown in FIG. FIG. 3A is an explanatory view showing the state in which resin is injected into the cavity in the molding apparatus shown in FIG. 1 in stages, and the shape of the plate-like portion of the injection-molded body molded by this procedure. It is a cross-sectional schematic diagram (FIG.3 (d)) which shows. It is a cross-sectional schematic diagram which shows an example of the aspect of the space | interval enlarged part which comprises the flow suppression part in the cavity of the shaping | molding apparatus used in this invention. It is a cross-sectional schematic diagram which shows an example of the aspect of the narrow part which comprises the flow suppression part in the cavity of the shaping | molding apparatus used in this invention. It is a cross-sectional schematic diagram which shows an example of the aspect of the flow suppression part in the cavity of the shaping | molding apparatus used in this invention. It is a cross-sectional schematic diagram which shows another example of the aspect of the flow suppression part in the cavity of the shaping | molding apparatus used in this invention. It is a cross-sectional schematic diagram which shows another example of the aspect of the flow suppression part in the cavity of the shaping | molding apparatus used in this invention. It is a cross-sectional schematic diagram which shows another example of the aspect of the flow suppression part in the cavity of the shaping | molding apparatus used in this invention. It is principal part upper surface explanatory drawing which shows an example of the aspect which provided the several flow suppression part in the space part in the cavity of the shaping | molding apparatus used in this invention. An example of the aspect of the injection molded body of the present invention obtained by molding by the molding apparatus shown in FIG. 1 is shown, FIG. 11 (a) is a plan view, and FIG. 11 (b) is a GG in FIG. 11 (a). Sectional drawing of a direction and FIG.11 (c) are side views. FIG. 12A is a schematic cross-sectional view illustrating an example of the shape of a cavity of a mold used in the molding apparatus of the present invention, and FIG. 12B is molded by the cavity shown in FIG. It is a principal part cross-sectional schematic diagram which shows the shape of the joining boundary surface vicinity of the injection-molded body. FIG. 13A shows another example of the injection-molded product of the present invention obtained by molding with the molding apparatus of the present invention, FIG. 13A is a plan view, and FIG. 13B is the HH direction of FIG. FIG. 13C is a side view of FIG. FIG. 5 is a perspective view showing still another example of the injection molded body of the present invention obtained by molding with the molding apparatus of the present invention. It is a principal part cross-sectional end view corresponding to the DD direction in FIG. 14 of the metal mold | die for shape | molding the injection-molded body shown in FIG. It is a principal part cross-sectional end view of the EE direction of the metal mold | die shown to Fig.15 (a). It is a principal part cross-sectional end view of the FF direction of the metal mold | die shown to Fig.15 (a). It is a principal part cross-sectional schematic diagram explaining another example of the shape of the cavity of the metal mold | die used for the shaping | molding apparatus of this invention. It is a principal part cross-sectional schematic diagram explaining another example of the shape of the cavity of the metal mold | die used for the shaping | molding apparatus of this invention. It is a principal part cross-sectional schematic diagram explaining another example of the shape of the cavity of the metal mold | die used for the shaping | molding apparatus of this invention. It is a principal part cross-section schematic diagram explaining another example of the shape of the cavity of the metal mold | die used for the shaping | molding apparatus of this invention. It is a principal part cross-sectional schematic diagram explaining another example of the shape of the cavity of the metal mold | die used for the shaping | molding apparatus of this invention. It is a principal part cross-sectional schematic diagram explaining another example of the shape of the cavity of the metal mold | die used for the shaping | molding apparatus of this invention. It is a principal part cross-sectional schematic diagram explaining an example of the shape aspect of the cavity of the metal mold | die used for the shaping | molding apparatus of this invention. It is principal part upper surface explanatory drawing which shows another example of the aspect which provided the several flow suppression part in the space part in the cavity of the shaping | molding apparatus used in this invention. It is a principal part cross-section schematic diagram which shows the shape of the joining boundary surface vicinity of the injection molded object shape | molded by the cavity shown in FIG. It is a principal part cross-section schematic diagram which shows the shape of the joining boundary surface vicinity of the injection molded object shape | molded by the cavity shown in FIG. It is a principal part cross-sectional schematic diagram which shows the shape of the junction boundary surface vicinity of the injection molded object shape | molded by the cavity shown in FIG. FIG. 20 is a schematic cross-sectional view of the relevant part showing a shape in the vicinity of a joint boundary surface of an injection-molded body formed by the cavity shown in FIG. 19. It is a principal part cross-section schematic diagram which shows the shape of the junction boundary surface vicinity of the injection molded object shape | molded by the cavity shown in FIG. It is a principal part cross-section schematic diagram which shows the shape of the joining boundary surface vicinity of the injection molded object shape | molded by the cavity shown in FIG. It is a principal part cross-sectional schematic diagram which shows an example of the shape of the junction boundary surface vicinity of the injection molded object shape | molded by the cavity shown in FIG. It is a principal part cross-sectional schematic diagram for demonstrating the cavity used in this invention. It is explanatory drawing explaining the state of the resin inject | poured into the cavity shown in FIG. FIG. 32 is a schematic cross-sectional view of the relevant part showing a shape in the vicinity of a joining boundary surface of an injection molded body formed by the cavity shown in FIG. 31. It is a principal part cross-sectional schematic diagram of the injection molded body of this invention easy to cut | disconnect. It is a schematic diagram explaining an example of the cross-sectional shape of the cavity used in this invention. It is a cross-sectional schematic diagram which shows the metal mold | die of the other aspect used in this invention. It is a top view which shows the shape of the fixed mold in the metal mold | die shown in FIG. It is a cross-sectional end view of each part of the fixed mold shown in FIG. It is a top view which shows the shape of the molded object shape | molded using the fixed metal mold | die shown in FIG. It is a cross-sectional end view of each part of the molded body shown in FIG. It is a top view which shows the shape of the molded object shape | molded using the fixed mold of a shape different from the fixed mold shown in FIG.

Explanation of symbols

2: Molding apparatus 10, 100: Molds 12, 12a, 12b, 12c, 12d, 12f, 12e, 12g, 12h, 12sp: Cavity 14a: First injection means 14b: Second injection means 18, 18bb, 307 : Space portions 20, 20a, 20f: Boundary surfaces 22, 22a, 22b, 22c, 22d, 22f: First cavity portions 24, 24a, 24b, 24c, 24d, 24f: Second cavity portions 25, 25a, 25b 25bb: Wall surface 42, 42aa, 42bb, 42q, 42qq, 42f, 43, 44: Recess 50, 52a, 50d, 50e, 50f, 50g, 50h, 50x, 50sp, 50z: Injection molded body 52, 52b, 52c , 52d, 52e, 52f, 52sp: bonding interface surfaces 54, 54a, 54b, 54c, 54d, 54f, 54s , 54z: first component 55, 55a, 55b, 55c, 55f, 55sp, 55z: second component 58, 58a, 58b, 58c, 58d, 92: plate portion 59d, 59s, 59sp, 59z: other Plate portions 62, 62a, 62b, 62c, 62d, 63d, 62f, 65, 62a, 62x: ribs 66a, 66b, 66c, 66d, 66e, 66f, 66p, 66q, 66qq: ridges 70, 70b, 70c, 70d, 206, 206a: narrow part 78a, 78f, 78b, 78c, 78d: thin part 88sp, 88ssp, 88spp, 88sspp: wedge-shaped part
90sp, 90ssp: Opening edge 99a, 99sp, 99ssp, 99z, 99zz: Groove 201, 201aa, 201aa, 201b, 201c, 201d, 201pp, 201ppp, 201pq, 201qp, 201x, 2015a, 2015b, 2015c, 201e, 201f, 2015g , 201x, 201y, 315: flow restraint portions 202, 202a: interval enlargement portion 208: step portion 222x: thickness change portion 320: bend portion 330: interval expansion path

Claims (14)

A first cavity portion having a plate-shaped space portion sandwiched between a pair of opposing wall surfaces and having an interval between the wall surfaces of h, and a first cavity portion communicating with the first cavity portion at a boundary surface at one end of the space portion. A second cavity portion, a cavity partitioned into,
A first injection means for injecting an amount of the first molding material filled in the first cavity portion into the first cavity portion; and a second molding of an amount filled in the second cavity portion. Second injection means for injecting material into the second cavity portion;
In the space portion, wherein the first molding material, the suppressing the flow proceeds toward a space portion on the boundary surface, the multiple flow suppressing portion of the elongated parallel to a direction along the length of the boundary surface provided, between the flow suppressing portion and the boundary surface closest to the boundary surface, the distance between the surface direction of the wall surface Ri 0~2h der,
The flow suppression unit is an interval changing unit including an interval expanding unit in which an interval between the wall surfaces is expanded or a narrowing unit in which an interval between the wall surfaces is reduced,
The flow control portion closest to the boundary surface is formed by a ridge,
The narrow portion formed by the ridges is formed on one wall surface of the pair of wall surfaces, and the interval enlarged portion formed by the concave stripes is provided on the one wall surface adjacent to the ridges. It was injection molding apparatus. The interval changing portion, in the direction perpendicular to the direction along the length of the boundary surface, the injection molding apparatus of claim 1 width is 2h or less. The injection molding device according to claim 2 , wherein a distance between the convex strip and the concave strip in the surface direction of the wall surface is 0 to 2 h. The second cavity portion has another plate-shaped space portion sandwiched between a pair of opposing wall surfaces, and communicates with the first cavity portion at one end of the other space portion, and the other space. One or a plurality of other elongated flows parallel to a direction along the length of the boundary surface, suppressing the flow of the second molding material in the portion toward the boundary surface in the other space portion. The wall surface between the boundary surface and the other flow suppression portion closest to the boundary surface when a suppression portion is provided and the distance between the pair of wall surfaces of the second cavity portion is h ′ The injection molding apparatus according to any one of claims 1 to 3 , wherein an interval in the surface direction is 0 to 2h '. The injection molding apparatus according to any one of claims 1 to 4 , further comprising a flow control unit configured to control a flow of the resin flowing toward the flow suppressing unit through the space portion. The flow suppressing portion has a bent portion that looks at the space portion on the inner side of the bend, and the flow control means extends toward the bent portion, and is an interval expansion path in which an interval between the pair of wall surfaces is extended. The injection molding apparatus according to claim 5 . A molding method using the injection molding apparatus according to any one of claims 1 to 5 ,
An amount of the first molding material filled in the first cavity portion is injected into the first cavity portion, and an amount of the second molding material filled in the second cavity portion is injected into the first cavity portion. A method for producing an injection-molded body, wherein the second molding material is associated with the injected first molding material by injecting into the second cavity portion. When the temperature of the injected first molding material at the tip of the first cavity portion becomes a temperature not lower than the melting point and not lower than the softening point of the molding material, The injection molded body according to claim 7 , wherein the second molding material in a molten state is caused to enter by injection by the second injection means so that the first component and the second component are brought into contact with each other. Method. The method for producing an injection-molded article according to claim 7 or 8 , wherein the second molding material is an elastomer, and the first molding material is a resin harder than the second molding material. An injection-molded body obtained by the method of manufacturing an injection-molded body according to any one of claims 7 to 9 , wherein the molded body has a plate portion having a thickness hs made of different molding materials. The one constituent part and the second constituent part are joined with the end faces being in contact with each other at the joining boundary surface located at one end of the plate part,
Wherein the first component is parallel to a direction along the length of the bonding interface, due to the ribs or grooves, have a varied thickness of several to said plate portion,
The thickness change portion closest to the joint boundary surface is a groove derived from the ridge, and the thickness change portion adjacent to the closest thickness change portion is a rib derived from the recess, An injection-molded body in which the interval in the surface direction of the plate portion between the joint boundary surface and the thickness change portion closest to the joint boundary surface is 0 to 2 hs. The injection-molded article according to claim 10 , wherein the second component part has another plate part, and is joined to the first component part at one end of the other plate part. Is joined with the tip of the plate portion at the distal end and the first structural portion of the front SL other plate portion via the bonding interface, chevron shape the bonding interface is protrudes in the direction of the second component The other plate portion is divided into two at the tip portion, and one tip portion and another tip portion having a wedge shape are formed, and the tip of the one tip portion reaches the groove, The injection-molded article according to claim 11 , wherein the tip of the other tip is in contact with the side of the plate portion opposite to the surface on which the groove is formed. Said thickness changing portion due to the groove is formed in the plate portion, the other claims 12 to thickness changing portion according to another parallel grooves in a direction along the length of the bonding interface to the plate portion is formed The injection-molded article described. The second molding material forming the components of a elastomeric, the first component of claims 10 to molding materials constituting is a resin harder than the molding material forming the second component 13 The injection-molded article according to any one of the above.

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