JP5847658B2 - Manufacturing method of resin molded products - Google Patents

Description

  The present invention relates to a method for producing a resin molded product provided with a stitch pattern.

  A multi-layer member formed by laminating synthetic resins having different physical properties such as color and hardness is used for an operation button of a tape recorder, for example (see, for example, Patent Document 1). As shown in FIG. 10D, the operation button 100 includes a first resin molded body 102 having a protrusion 102a on the upper surface, and a second surface that covers the upper surface of the first resin molded body 102 other than the protrusion 102a. The upper surface of the second resin molded body 104 is aligned with the upper end surface of the protrusion 102a. In the operation button 100, the upper end surface of the protrusion 102a that is surrounded by the second resin molded body 104 and exposed on the upper surface is formed in a predetermined design shape such as a rewind mode display mark. Such a multilayer member is molded by a so-called two-color molding method.

  The manufacturing method of the operation button 100 by the two-color molding will be described. The first cavity 114 defined by the first mold 110 and the second mold 112 having the concave portion matched with the protrusion 102a has a first cavity 114. A resin material is injected to form the first resin molded body 102 (see FIG. 10A). The second mold 112 is removed, and the third mold 116 is attached to the upper end surface of the protrusion 102a of the first resin molded body 102 with respect to the first mold 110 holding the first resin molded body 102. The mold is closed by abutting (see FIG. 10B). A second resin raw material is injected into the second cavity 118 defined between the upper surface of the first resin molded body 102 and the third mold 116, and the second resin molded body 104 is formed. It forms on the upper surface of the 1st resin molding 102 so that the upper end surface of protrusion 102a may be exposed (refer FIG.10 (c)).

JP 60-184819 A

  In the manufacturing method described above, in order to prevent the upper end surface of the protrusion 102a from being covered with the second resin molded body 104, the third mold 116 is attached to the upper end surface of the protrusion 102a of the previously molded resin molded body 102. It abuts and seals the upper end surface. During resin molding, the position of the protrusion 102a may slightly shift due to the contraction of the first resin molded body 102. Therefore, when the protrusion 102a of the first resin molded body 102 protrudes from the surface of the second resin molded body 104, when the protrusion 102a is displaced, the third mold 116 is closed. Formation of the protrusion 102a such that the protrusion 102a is damaged at the corner of the corresponding recess of the third mold 116, or the protrusion 102a is covered with the second resin molded body 104 due to poor sealing of the third mold 116. It leads to a defect.

  That is, the present invention has been proposed to solve these problems in view of the above-mentioned problems inherent in the conventional method for producing a resin molded article, and is a resin capable of neatly forming a pseudo stitch pattern. It aims at providing the manufacturing method of a molded article.

In order to overcome the above-mentioned problems and achieve the intended purpose, a method for producing a resin molded product according to claim 1 of the present application,
A method of manufacturing a resin molded product in which a pseudo stitch pattern is formed on the surface,
Resin raw material is injected into a first cavity defined between the common mold part and the primary mold part, and in the first cavity, a plurality of thread parts formed side by side on the front side and the thread parts are aligned. Forming a first member having a formed hole;
In the common mold part, the convex part formed with the hole part is fitted into the hole part, and the primary mold part is replaced with the secondary mold part while leaving the first member in the common mold part. Resin raw material is injected into a second cavity defined between the secondary mold part and the common mold part whose projecting ends are sealed, and the second member is molded on the front side of the first member in the second cavity. ,
The gist of the invention is that the stitches of the stitch pattern are formed on the surface by a plurality of thread portions protruding and exposed from the surface of the second member.
According to the invention which concerns on Claim 1, the 1st member shape | molded by the 1st cavity between a common mold part and a primary mold part is replaced from a primary mold part to a secondary mold part, without removing from a common mold part. The second member is molded in the second cavity between the common mold part and the secondary mold part to obtain a resin molded product having the first member and the second member. Here, in the common mold part commonly used for molding the first member and the second member, the primary mold part can be removed or the secondary mold part can be removed while the convex part molded with the hole is fitted in the hole part. The mold parts are matched or the second member is molded. That is, since the convex part of the common mold part fitted in the hole part formed according to the thread part acts as an anchor, the contraction of the first member can be suppressed. Accordingly, it is possible to prevent the yarn portion formed on the first member from being displaced as the first member contracts, the secondary mold portion interferes with the yarn portion, or the yarn at the secondary die portion. It is possible to avoid a poor seal at the portion, and it is possible to cleanly form a pseudo stitch pattern represented by the thread portion protruding from the surface of the second member.

The gist of the invention according to claim 2 is that the hole portion is formed in a concave shape that opens to the back side corresponding to the back side of the formation position of the thread portion.
According to the invention which concerns on Claim 2, the position shift | offset | difference of the thread part located in the front side can be prevented by the convex part of the common type | mold part fitted to the hole.

The gist of the invention according to claim 3 is that the hole is formed adjacent to the thread along the line of the plurality of threads.
According to the invention which concerns on Claim 3, the position shift | offset | difference of the adjacent thread part can be prevented by the convex-shaped part of the common type | mold part fitted to the hole.

The invention according to claim 4 is characterized in that the hole is formed so as to penetrate the first member in the front and back direction.
According to the invention which concerns on Claim 4, the fitting margin of a hole part and a convex-shaped part can be enlarged, and the position shift of the adjacent thread part is prevented by the convex-shaped part of the common type part fitted to the hole. can do.

  According to the method of manufacturing a resin molded product according to the present invention, a pseudo stitch pattern can be formed neatly.

1 is a schematic perspective view showing an instrument panel according to a preferred embodiment of the present invention. It is a schematic perspective view which expands and shows the instrument panel of an Example. It is a schematic perspective view which shows the 1st member of an Example. It is a schematic plan view which shows the principal part of the instrument panel of an Example. (a) is the sectional view on the AA line of FIG. 4, (b) is the sectional view on the BB line of FIG. It is explanatory drawing which fractures | ruptures and shows the manufacturing process of the instrument panel by two-color shaping | molding in the position corresponding to the AA line of FIG. 4, Comprising: (a) shows the formation process of a 1st member, (b) The state which removed the primary type | mold part is shown, (c) shows before closing a secondary mold part, (d) shows the formation process of a 2nd member. It is explanatory drawing which fractures | ruptures and shows the manufacturing process of the instrument panel by two-color molding in the position corresponding to the BB line of FIG. 4, (a) shows the formation process of a 1st member, (b) The state which removed the primary type | mold part is shown, (c) shows before closing a secondary mold part, (d) shows the formation process of a 2nd member. It is a schematic plan view which shows the example of a change of a stitch pattern. It is CC sectional view taken on the line of FIG. It is explanatory sectional drawing which shows the manufacturing process of the conventional multilayer member, Comprising: (a) shows the condition which shape | molds a 1st resin molded object with a 1st metal mold | die and a 2nd metal mold | die, (b) Shows the situation where the second mold is removed and the third mold is set, (c) shows the situation where the second resin molded body is molded by the first mold and the third mold, (d) shows the obtained multilayer member.

  Next, the method for producing a resin molded product according to the present invention will be described below with reference to the accompanying drawings by way of preferred examples. In the embodiment, an example in which an instrument panel 30 as shown in FIGS. 1 and 2 which is one of vehicle interior members is manufactured as a resin molded product will be described. Here, in the instrument panel (resin molded product) 30, the side facing the design surface 31 is referred to as the front side, and the side facing the attachment surface to the other member is referred to as the back side. For example, in the case of a vehicle interior member such as the instrument panel 30, the passenger compartment side facing the design surface 31 is the front side, and the vehicle body side to which the vehicle interior member is attached is the back side.

  As shown in FIG. 4 or 5, the instrument panel 30 obtained by the manufacturing method according to the embodiment includes a first member 32 and a second member 42 provided on the front side of the first member 32. A design surface 31 is formed to imitate a state covered with a skin material such as the above. Further, the design surface 31 of the instrument panel 30 is provided with a seam imitating a portion where the skin materials are connected to each other, and a pseudo out-stitch extending along the seam (FIG. 2). reference). Here, the seam is formed by a seam portion 46 formed on the surface of the second member 42. Furthermore, the design surface 31 of the instrument panel 30 is provided with a pseudo in-stitch exposed at the joint, and in the embodiment, a stitch pattern simulating a single stitch is formed by an out-stitch and an in-stitch.

  In the instrument panel 30, most of the design surface 31 is constituted by the surface of the second member 42, and is formed on the first member 32 to slightly protrude from the surface of the second member 42 and be exposed ( The stitch portion 34 forms an out-stitch seam (see FIGS. 4 and 5). In the embodiment, a second thread part (another thread part) 44 forming an in-stitch seam facing the joint is integrally formed on the surface of the second member 42. In the instrument panel 30, the protruding end portion of the first thread portion 34 exposed from the second member 42 to the front side and the surface of the second member 42 are formed in different colors. That is, in the instrument panel 30, the color of the first thread portion 34 simulating a thread for sewing the skin material is set according to the thread, while the surface of the second member 42 simulating the skin material is the surface material. The color is set according to.

  Various materials can be used as the material forming the first member 32 and the second member 42. For example, the first member 32 and the second member 42 may be made of the same material, or different materials may be combined, such as an elastomer such as polypropylene (PP), polyethylene (PE), and TPO (olefin elastomer), and a foamed material such as polyurethane. can do. In the embodiment, the first member 32 is made of polypropylene and the second member 42 is made of TPO. Further, the instrument panel 30 is joined to the first member 32 when the material forming the second member 42 is cured, and the first member 32 and the second member 42 are integrated at the time of molding. And the instrument panel 30 is shape | molded by the raw material by which the 1st member 32 and the 2nd member 42 were toned, and the effort which colors after shaping | molding is saved.

  The first member 32 is provided so as to correspond to at least a portion where the stitch pattern is formed, and constitutes the entire back side of the instrument panel 30 in the embodiment. The first member 32 includes a flat base portion 32a whose front side is covered with a second member 42, and a plurality of first thread portions 34 integrally formed on the front side of the base portion 32a (FIG. 3). And FIG. 5). Each first thread portion 34 protrudes from the surface of the base portion 32a toward the front side, and a protruding end portion facing the front side of the instrument panel 30 is formed in a short bar shape imitating one of the seams in plan view. The plurality of first thread portions 34 are arranged on a line along the seam (seam portion 46), and the long side of each first thread portion 34 is along the line (see FIG. 4). In the embodiment, the first thread portion 34 is basically formed with the same length, and the interval between the adjacent first thread portions 34, 34 is basically constant. Further, fine streak-like irregularities imitating yarn twists are formed on the protruding end portion of the first thread portion 34.

  As shown in FIGS. 4 and 5, the base portion 32 a of the first member 32 has a first hole portion (in the direction in which the first yarn portion 34 is arranged, corresponding to the back side of the formation position of the first yarn portion 34 ( A hole 38) is formed, and a second hole (hole) 40 is formed adjacent to the first thread 34. The first hole 38 is formed in a concave shape that opens to the back side in the base portion 32a, and is set so as not to penetrate the front side. That is, the depth of the first hole portion 38 can be formed so as to be recessed from the plate thickness range or the back side of the base portion 32 a to the inside of the first thread portion 34. Further, even if the first hole 38 is formed so as to extend continuously in the arrangement direction of the plurality of first thread portions 34 (Example), the predetermined number of first thread portions 34 or an appropriate pitch. A plurality may be formed. Furthermore, the opening shape of the first hole 38 can be a predetermined shape such as a rectangle or a circle, or the same shape as or a similar shape to the planar shape of the first thread portion 34. The first hole 38 is preferably formed at a depth of 50% or more of the thickness of the base portion 32a. The first hole portion 38 is formed so as to reduce the thickness of the plate-like base portion 32a, and is not formed in a concave shape by bending the base portion 32a.

  The second hole portion 40 is provided on the lateral side perpendicular to the arrangement direction of the plurality of first yarn portions 34, shifted from the first yarn portion 34 (alignment line of the first yarn portions 34), and in the base portion 32a. It is formed so as to penetrate a concave shape or a base portion 32a opened on the back side in the front and back direction (example) (see FIGS. 4 and 5). Further, a plurality of second hole portions 40 penetrating the base portion 32a are formed for each predetermined number of first thread portions 34 or at an appropriate pitch so that the base portion 32a is not divided by the second hole portions 40. Yes. The second hole 40 may be formed so as to continuously extend along the direction in which the plurality of first thread portions 34 are arranged as long as the second hole 40 does not penetrate the base portion 32a. Furthermore, the opening shape of the 2nd hole part 40 can be formed in suitable shapes, such as a rectangle and a circle | round | yen, and in the Example, it is formed in the rectangle which the longitudinal length extends in the said row direction. And although the 2nd hole part 40 of the Example was provided adjacent to one side of the line of the corresponding 1st thread part 34, you may provide along the both sides of this line. In the embodiment, the first and second holes 38 and 40 have a shape in which the opening edge extends linearly in the front and back direction, but may be formed so as to taper from the back side to the front side. The second hole 40 is preferably in a range of 15 mm from the first thread 34. In addition, the code | symbol 33 shown in FIG. 2 and FIG. 3 is an opening for air outlets.

  The second member 42 is formed in an appropriate shape according to the design shape of the instrument panel 30. On the surface of the second member 42, a seam portion 46 formed in a step shape is provided (see FIG. 5), and the seam portion 46 extends continuously over a required length. A plurality of second thread portions 44 are integrally formed on the second member 42 so as to be positioned at the joint portion 46 (see FIG. 5). The plurality of second thread portions 44 are arranged side by side on the extending line of the joint portion 46. Each second thread portion 44 is a protrusion that protrudes from the corner of the stepped seam portion 46 toward the front side, and each second thread portion 44 extends beyond the first thread portion 34. The length dimension along the existing line is formed small. Further, the second member 42 is provided with one second thread portion 44 adjacent to the first first thread portion 34, and in the embodiment, the position corresponding to the substantially longitudinal center of the corresponding first thread portion 34. Is arranged. In addition, on the surface of the second member 42, a recessed portion 48 that is recessed toward the first yarn portion 34 is formed at a peripheral portion of the first yarn portion 34 exposed on the front side of the second member 42. In the instrument panel 30, a shape in which the second member 42 is compressed by the seam formed by the first thread portion 34 by the recessed portion 48 is expressed. Furthermore, a pattern such as embossing is formed on the surface of the second member 42 as necessary.

  Next, a method for manufacturing the instrument panel 30 according to the embodiment will be described. In the embodiment, the instrument panel 30 having the first member 32 and the second member 42 is manufactured by two-color molding. For example, the molding apparatus used in the embodiment is disposed so as to face the common mold part 50 provided to be movable between the first position and the second position, and the common mold part 50 in the first position. A primary mold part 52 that moves forward and backward with respect to the common mold part 50 and a secondary mold part 54 that is arranged to face the common mold part 50 at the second position and moves forward and backward with respect to the common mold part 50. (See FIGS. 6 and 7). By closing the common mold part 50 and the primary mold part 52, a first cavity 56 (first cavity) 56 that matches the first member 32 is defined between the common mold part 50 and the primary mold part 52. (See FIG. 6 (a) and FIG. 7 (a)). At this time, the back side of the first member 32 is defined by the molding surface of the common mold part 50, while the front side of the first member 32 is defined by the primary mold part 52. That is, on the molding surface of the common mold part 50, a first convex part 50 a is provided according to the first hole part 38, and a second convex part 50 b is provided according to the second hole part 40. . Further, a concave portion 52 a is provided on the molding surface of the primary mold portion 52 so as to match the first thread portion 34. The closed end of the concave portion 52a is provided with fine streaky irregularities (not shown) so that the first thread portion 34 is provided with irregularities imitating a twist at the same time as the first member 32 is formed. It has become. The first resin raw material that is the element of the first member 32 is injected into the first cavity 56. Then, the first resin raw material is cured in the first cavity 56, whereby the first member 32 having the above-described shape is formed (see FIGS. 6B and 7B). Specifically, the first member 32 is obtained in which a plurality of first thread portions 34 projecting to the design surface 31 side of the instrument panel 30 are formed on the front side and the holes 38 and 40 are formed. Here, by mixing a predetermined color material with the first resin raw material, the obtained first member 32 including the first thread portion 34 has a color that matches the stitches of the stitch pattern. In the embodiment, the first member 32 is formed by an injection molding method.

  In the common mold part 50, the convex parts 50a, 50b formed with the holes 38, 40 are fitted into the corresponding hole parts 38, 40 so that the first member 32 remains in the common mold part 50. The primary mold part 52 is removed (see FIGS. 6B and 7B). By moving the common mold part 50 so as to face the secondary mold part 54 (see FIGS. 6C and 7C), the common mold part 50 and the secondary mold part 54 are closed. A second cavity (second cavity) 58 is defined between the common mold part 50 and the secondary mold part 54 so as to match the second member 42 (FIGS. 6D and 7D). reference). At this time, the first member 32 is held on the molding surface of the common mold portion 50 with the convex portions 50a, 50b and the holes 38, 40 fitted, and the front side of the second member 42 is While being defined by the secondary mold portion 54, the protruding end portion of the first thread portion 34 is sealed by the molding surface of the secondary mold portion 54 (see FIG. 6D). That is, the molding surface of the secondary mold portion 54 is provided with a seal surface 54a that seals the protruding end portion of the first thread portion 34 in accordance with the first thread portion 34, and is recessed around the seal surface 54a. A protrusion 54 b that forms the recess 48 is provided. The seal surface 54a is provided with fine streak irregularities (not shown) so as to mesh with the irregularities imitating the twists of the first thread portion 34 formed simultaneously with the molding of the first member 32. It has become. Further, the molding surface of the secondary mold part 54 is provided with an uneven part 54 c that defines the second thread part 44 and the joint part 46.

  A second resin material to be a base of the second member 42 is injected into the second cavity 58. At this time, the second resin raw material can be flowed between the second cavities 58 sandwiching the first yarn portion 34 via the adjacent first yarn portions 34, 34 (FIG. 6 (d) and FIG. 7 (d)), the second resin raw material can be filled quickly and without gaps in the second cavity 58. Then, by curing the second resin material in the second cavity 58, the second member 42 including the second thread portion 44, the joint portion 46, and the recessed portion 48 is formed. Specifically, the protruding end portion of the first thread portion 34 is sealed by the molding surface of the secondary mold portion 54 so that the protruding end portion of the first thread portion 34 is exposed to the front side of the second member 42. The front side of the first member 32 is covered with the second member 42. Here, by mixing a predetermined color material with the second resin material, the obtained second member 42 has a color that matches the design surface 31 of the instrument panel 30. In the embodiment, the second member 42 is formed by an injection molding method.

(Operation of Example)
Next, the operation of the manufacturing method according to the embodiment will be described. The instrument panel 30 is formed with a first member 32 having a first stitch portion 34 forming an out-stitch seam, and the second stitch portion 34 is exposed to the design surface 31 side and slightly protrudes. It is manufactured by molding the member 42. That is, since the first member 32 and the second member 42 are formed in separate forming steps, the surface of the first member 34 and the surface of the second member 42 that forms a pseudo stitch pattern together with the first member 34. The degree of freedom in setting the colors and defining the shape of each is high. For example, according to the manufacturing method of the embodiment, at the time of forming the first thread portion 34 (first member 32), the second member 42 is similarly not affected by the color of the second member 42, the molding conditions, the resin raw material, and the like. When molding 42, there is no restriction on the color of the first member 32, molding conditions, resin raw materials, or the like. Therefore, an instrument panel 30 having a stitch pattern close to the real thing can be obtained by a simple manufacturing method. In addition, by adopting two-color molding, it is possible to eliminate the bonding and assembling process of the first member 32 and the second member 42, so that the manufacturing cost can be reduced.

  As described above, in the manufacturing method of the embodiment, the first member 32 formed by the first cavity 56 between the common mold part 50 and the primary mold part 52 is removed from the primary mold part 52 without removing the first member 32 from the common mold part 50. An instrument panel having the first member 32 and the second member 42, which is replaced with the next die portion 54, the second member 42 is formed in the second cavity 58 between the common die portion 50 and the secondary die portion 54. 30 has been earned. Here, in the common mold portion 50 that is used in common when the first member 32 and the second member 42 are molded, the convex portions 50a and 50b formed with the hole portions 38 and 40 are fitted into the hole portions 38 and 40, respectively. The primary mold part 52 is removed from the common mold part 50, the secondary mold part 54 and the common mold part 50 are closed, or the second member 42 is molded. At this time, since the convex portions 50a and 50b of the common mold portion 50 fitted into the holes 38 and 40 formed in accordance with the first thread portion 34 act as anchors, the contraction of the first member 32 can be suppressed. . That is, the first thread part 34 formed on the first member 32 is displaced as the first member 32 contracts, and the holes 38 and 40 provided in accordance with the first thread part 34 and the convex parts It can prevent by fitting with the shape parts 50a and 50b. Accordingly, the first thread part 34 is displaced and interferes with the seal surface 54a of the secondary mold part 54, or a sealing failure of the first thread part 34 in the secondary mold part 54 can be avoided. The pseudo stitch pattern to be made can be formed cleanly. In addition, according to the manufacturing method described above, the influence of the shrinkage of the first member 32 can be suppressed, so that each first thread portion 34 can be made smaller and the pitch can be made finer, and the stitch pattern can be made more authentic. You can look like it. More specifically, the first convex portion 50a of the common mold portion 50 fitted in the first hole portion 38 prevents the first thread portion 34 located on the front side of the first hole portion 38 from being displaced. Can do. Moreover, the position shift of the adjacent 1st thread part 34 can be prevented by the 2nd convex-shaped part 50b of the common type | mold part 50 fitted to the 2nd hole part 40. FIG. In addition, by forming the second hole 40 so as to penetrate therethrough, the fitting margin between the second hole 40 and the second convex portion 50b can be increased, and the second convex shape fitted into the second hole 40 is obtained. The position shift of the adjacent first thread portion 34 can be more suitably prevented by the portion 50b.

  In the instrument panel 30 of the embodiment, the first member 32 formed with the first thread portion 34 forming the stitch pattern seam is a separate member from the second member 42 forming the design surface 31 of the instrument panel 30. . Then, with the protruding end portion of the first thread portion 34 exposed to the front side, the front side of the first member 32 is covered with the second member 42 and the protruding end portion of the first thread portion 34 exposed to the design surface 31 side. The surface shape of the second member 42 that forms the periphery of the first thread portion 34 (the recessed portion 48, the joint portion 46, and the second thread portion 44) constitutes a pseudo stitch pattern. For example, if the seam is integrally formed with the member forming the design surface 31 of the instrument panel 30, the color of the design surface 31 and the seam cannot be changed, and the design surface 31 is softened while the seam is hardened. And the design surface 31 cannot change the texture. According to the instrument panel 30 of the embodiment, since the first member 32 and the second member 42 are separate members, the colors of the respective members 32 and 44 (the surfaces of the first thread portion 34 and the second member 42). And a shape related to a stitch pattern such as a peripheral shape of the yarn portion 34 such as the yarn portion 34 or the joint portion 46, and selection of the material of the material are high. That is, as in the embodiment, if the first member 32 and the second member 42 are formed of resin materials of different colors, the thread portions 34 and 36 and the second member 42 are formed by different molding colors of the members 32 and 44. The surface can be easily different colors. Similarly, if the first member 32 and the second member 42 are formed of resin materials having different hardnesses, for example, the first thread portion 34 and the second member 42 can be easily set to have different textures. Therefore, according to the instrument panel 30 of the embodiment, the stitch pattern can be made more authentic. Moreover, the instrument panel 30 has a step-like seam portion 46 that forms a step-shaped seam on the design surface 31 in accordance with the seam and seam that are formed when leather or the like is actually sewn together, and a plurality of out-stitches. Since the first stitch portion 34 and the plurality of second stitch portions 36 forming in-stitch are formed, the stitch pattern can be made more authentic.

(Change example)
The present invention is not limited to the configuration of the embodiment described above, and can be modified as follows, for example.
(1) In the embodiment, a stitch pattern simulating a single stitch is illustrated, but a stitch pattern simulating a double stitch shown in FIGS. 8 and 9 and other stitch patterns may be used. Further, the stitch pattern may be only an out stitch, and it may not be provided with an in-stitch (second stitch portion) even when a seam is provided.
(2) In the modification shown in FIGS. 8 and 9, two rows of first members formed on the front side of the first member 32 on both sides of the seam portion 46 formed in a groove shape on the surface of the second member 42. The thread portions 34 and 34 are exposed on the front side of the second member 42. In the modified example, the plurality of first thread portions 34 are arranged in a line L along the joint portion 46 and are formed obliquely with respect to the line L. The seam portion 46 is formed in a tapered shape in the depth direction. In addition, a row of second thread portions 36 protruding from the front side of the first member 32 is exposed at the joint portion 46. The seam portion 46 forms a seam, the two rows of first thread portions 34 and 34 sandwiching the seam portion 46 form an out-stitch, and the second thread portion 36 exposed at the seam portion 46 forms an in-stitch that appears at the seam. A stitch pattern simulating a double stitch is formed on the design surface 31. In other words, the second thread portion 36 is formed on the first member 32 so as to protrude toward the design surface 31, and the protruding end portion of the second thread portion 36 is exposed to the design surface 31 side. The structure which forms may be sufficient. In this way, by forming the second thread portion 36 in the first member 32, the color or the like of the second thread portion 36 can be set separately from the second member 42. The degree of freedom of setting for the second thread portion 36 can be improved. In the configuration of the modified example, by providing the holes 38 and 40 in accordance with the second thread portion 36 as in the manufacturing method of the embodiment, it is possible to prevent the positional deviation of the second thread portion 36.

(3) In the embodiment, the instrument panel is exemplified as the resin molded product, but the present invention can be applied to a vehicle interior member such as a door trim, a pillar, a glove box lid, furniture, or other items on which stitch patterns are formed.
(4) The resin molded product may have a configuration in which the first member is only around the portion corresponding to the stitch pattern, and the first member may extend over the entire back side of the second member. For example, the first member may be a base material that ensures the rigidity of the resin molded product, and the second member that covers the first member may be a flexible skin material.
(5) Instead of forming the entire first thread part or the second thread part in one first member, the first member in which a part of the first thread part is formed and the remainder of the first thread part are formed. You may divide into the 1st member made according to a seam etc. As described above, the first member may be configured by one for the entire alignment direction of the seams or may be divided.
(6) In the method for producing a resin molded product, only one of the first hole and the second hole may be provided.

32 1st member, 34 1st thread part (thread part), 36 2nd thread part (thread part),
38 1st hole (hole), 40 2nd hole (hole), 42 2nd member, 50 common mold part,
50a first convex part (convex part), 50b second convex part (convex part), 52 primary mold part,
54 Secondary mold part, 56 First cavity (first cavity),
58 Second cavity (second cavity)

Claims (4)

A method of manufacturing a resin molded product in which a pseudo stitch pattern is formed on the surface,
Resin raw material is injected into a first cavity defined between the common mold part and the primary mold part, and in the first cavity, a plurality of thread parts formed side by side on the front side and the thread parts are aligned. Forming a first member having a formed hole;
In the common mold part, the convex part formed with the hole part is fitted into the hole part, and the primary mold part is replaced with the secondary mold part while leaving the first member in the common mold part. Resin raw material is injected into a second cavity defined between the secondary mold part and the common mold part whose projecting ends are sealed, and the second member is molded on the front side of the first member in the second cavity. ,
A method for producing a resin molded product, comprising: forming a seam of the stitch pattern on the surface by a plurality of thread portions protruding and exposed from the surface of the second member.   The method for producing a resin molded product according to claim 1, wherein the hole is formed in a concave shape that opens to the back side corresponding to the back side of the formation position of the thread portion.   The method for producing a resin molded product according to claim 1 or 2, wherein the hole is formed adjacent to the thread line along an arrangement line of a plurality of thread lines.   The manufacturing method of the resin molded product of Claim 3 which formed the said hole part so that the said 1st member might be penetrated in the front-back direction.

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