JP6281765B2 - Two-color molding mold, method for producing two-color molded article using this mold, and two-color molded article - Google Patents

Description

  The present invention relates to a two-color molding die for injection molding two kinds of synthetic resin materials, a method for producing a two-color molded product using the mold, and a two-color molded product.

  The following Patent Document 1 describes a method for producing a two-color molded article made of two types of resin materials using a mold. The mold is composed of a first mold, a second mold, and a slide core, and is disposed so as to be able to contact and separate from the first mold for forming the design surface and the first mold. The second mold is joined to each other. In addition, the slide core that is movably disposed in the housing recess formed in the second mold is disposed in a state of being brought close to the first mold. The inner layer is formed by filling the second resin material into the first cavity formed by this arrangement. Next, the slide core and the inner layer are moved away from the first mold to form a second cavity, and the second resin is filled in the second cavity to form the outer layer. Thereafter, the two-color molded product is formed by moving the slide core in a direction approaching the first mold and compressing the inner layer and the outer layer.

JP 07-290500 A

  However, in the invention described in Patent Document 1, both the first gate for injecting the first resin material and the second gate for injecting the second resin material are formed in the first mold, The first resin material is injected from the first gate after the second resin material is injected from the second gate. Thus, when there is a time difference between the process using the second gate and the process using the first gate, the second resin material injected from the first gate into the first cavity when forming the inner layer is the second gate. There is a problem in that it may intrude into the inside and hinder the subsequent injection of the second resin material forming the outer layer from the second gate.

  In order to solve the above-described problems in the prior art, the present invention provides a two-color molding die capable of preventing the resin material injected from the first gate from entering the second gate, and two using this die. It is an object to create a color molded product manufacturing method and a two-color molded product.

Among the means for solving the above problems, the first main configuration of the present invention is as follows.
A fixed mold having a first gate for injecting a first resin material to form a main body, and a fixed mold disposed so as to be able to contact with and separate from the fixed mold and injecting a second resin material to the main body A slide mold having a second gate for laminating outer layers;
A two-color molding mold formed between a fixed mold and a slide mold, in which a first resin material is injected into a first cavity and a second resin material is injected into a second cavity. When the first resin material) is injected into the first cavity at a position opposite to the second gate on the fixed mold side and the slide mold side, the second gate is closed and the body portion is traced. And a closing body having a function of forming a hole and releasing the closing of the second gate and closing the hole when the second resin material is injected into the second cavity. It is said.

  In the two-color molding die of the first main configuration of the present invention, the resin material injected from the first gate penetrates into the second gate even when the common cavity has a plurality of gates. Can prevent.

  According to another configuration of the present invention, a configuration in which the closing body has a flat surface that closes against the second gate at the tip of the pin is added to the main configuration described above.

  In the above configuration, the second gate can be set in a closed state by merely bringing the end of the closing body into contact with the second gate.

  According to another configuration of the present invention, a configuration in which the closing body has an insertion portion that closes and closes the inner wall of the second gate at the tip of the pin is added to the main configuration described above.

  In the above configuration, the insertion portion at the tip of the pin is closely fitted to the second gate, so that effective second gate closing can be achieved.

  In another configuration of the present invention, a configuration in which a straight portion is provided at the tip of the second gate is added to the above configuration.

  In the above configuration, since the straight portion is provided, the range in which the insertion portion at the tip of the pin is closely fitted to the second gate is widened, so that the second gate can be more completely closed.

A second main configuration of the present invention is a method for producing a two-color molded product performed using the two-color molding die described above,
A first step of forming a first cavity by placing the slide mold close to the stationary mold, and closing the second gate with a closing body;
A second step in which the inside of the first cavity is filled with the first resin material injected from the first gate to form the main body and a hole is formed in the main body by the closing body ;
A third step of sliding the slide mold away from the fixed mold to form a second cavity between the slide mold and the main body, and releasing the closure of the second gate by the closing body;
And a fourth step of filling the inside of the second cavity with the second resin material injected from the second gate and laminating the outer layer on the main body portion.

  In the two-color molding manufacturing method of the second main configuration of the present invention, the first mold is formed and the second gate is closed by the closing body by moving the slide mold to the first molding position. By moving the mold to the second molding position, the formation of the second cavity and the release of the closure of the second gate by the closure body can be achieved.

  In another configuration of the present invention, the second main configuration of the present invention includes the step of bringing the flat surface of the tip of the pin constituting the closing body into contact with the second gate, and the third step of the second main configuration of the present invention. 2 includes a step of separating the flat surface from the gate.

  In the above configuration, the second gate can be set in a closed state by a simple configuration in which the flat surface that is the tip of the closing body is merely brought into contact with the second gate.

  According to another configuration of the present invention, in the second main configuration of the present invention, the first step includes a step of closely fitting an insertion portion of a pin tip constituting the closing body to the inner wall of the second gate. The process includes a configuration including a step of removing the insertion portion from the second gate.

  In the above configuration, the second gate can be effectively closed by a simple configuration in which the insertion portion at the tip of the pin is inserted into the second gate.

A third main configuration of the present invention is a second resin material which is molded by the two-color molding die described above and forms an outer layer on the upper surface of the main body formed of the first resin material. Is a two-color molded product,
It has a pore-shaped trace formed when the closure body is pulled out on the lower surface of the main body portion made of the first resin material, and has a concave gate trace on the outer layer at a position facing the trace. It is said that it is characterized.

  In the two-color molded product of the third main configuration of the present invention, the trace of the main body portion side and the gate trace by the second gate on the outer layer side of the two-color molded product in which the outer layer is laminated on the main body portion are thick. It can be achieved that they are formed in overlapping positions in the direction.

  Since the present invention has the above-described configuration, the following effects can be obtained.

  In the present invention, since the first resin material injected from the first gate can be prevented from entering the second gate, the second resin material is reliably injected from the second gate. It is possible to manufacture a two-color molded product easily and with high accuracy.

It is a side view which shows the head of a hand pump as one Example of the two-color molded product of this invention. It is a top view of a head. It is a bottom view of a head. It is sectional drawing of a head. It is a schematic sectional drawing which shows the 1st Example of the metal mold | die for shape | molding a head. It is an expanded sectional view which shows the detail of the principal part A before filling with the 1st resin material as a 1st process of the manufacturing method of the two-color molded product using the metal mold | die shown in 1st Example. It is an expanded sectional view which shows the state which filled the 1st resin material in the metal mold | die as a 2nd process of the manufacturing method of the two-color molded product using the metal mold | die shown in 1st Example. It is an expanded sectional view which shows the state after the movement of a slide metal mold | die as a 3rd process of the manufacturing method of the two-color molded product using the metal mold | die shown in 1st Example. It is an expanded sectional view which shows the state which filled the 2nd resin material in the metal mold | die as a 4th process of the manufacturing method of the two-color molded product using the metal mold | die shown in 1st Example. It is sectional drawing which shows the principal part A of the two-color molded product manufactured by the manufacturing method of the two-color molded product using the metal mold | die shown in 1st Example. It is a perspective view which expands and shows the front-end | tip of the closing body in 2nd Example. It is an expanded sectional view showing the details of principal part A before filling the 1st resin material as the 1st process of the manufacturing method of the two-color molded article using the metallic mold shown in the 2nd example. It is an expanded sectional view which shows the state which filled the 1st resin material in the metal mold | die as a 2nd process of the manufacturing method of the two-color molded product using the metal mold | die shown in 2nd Example. It is an expanded sectional view of the metal mold | die which shows the state after the movement of a slide metal mold | die as a 3rd process of the manufacturing method of the two-color molded product using the metal mold | die shown in 2nd Example. It is an expanded sectional view which shows the state which filled the 2nd resin material in the metal mold | die as a 4th process of the manufacturing method of the two-color molded product using the metal mold | die shown in 2nd Example. It is sectional drawing which shows the principal part A of the two-color molded product manufactured by the manufacturing method of the two-color molded product using the metal mold | die shown in 2nd Example.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 is a side view showing a head of a hand pump as an embodiment of the two-color molded product of the present invention, FIG. 2 is a plan view of the head, FIG. 3 is a bottom view of the head, FIG. 4 is a sectional view of the head, and FIG. FIG. 3 is a schematic sectional view showing a first embodiment of a mold for molding a head.

  The two-color molded product shown in FIG. 1 as an embodiment of the present invention is a hand pump for dispensing an appropriate amount of contents from a container body (not shown) containing, for example, liquid soap, shampoo, rinse, etc. It is a head 1 provided in the upper part. The head 1 is a synthetic resin molded product that mainly includes a main body 2 and an outer layer 3 provided on the upper portion of the main body 2.

  The two-color molded product of the present invention has a configuration having a design effect by adopting different colors so that the main body 2 is white and the outer layer 3 is green, for example. There is a configuration in which the body portion 2 is formed of polypropylene (PP) and the outer layer 3 is made of an elastomer which is a non-slip material and has a functional effect using resin materials of different materials. Alternatively, there is a configuration having both a design effect by different colors and a functional effect by different materials.

  The main body 2 extends integrally below the main body 2 and connects to the main body 2 and an operating shaft protruding from a pump actuating member (not shown), and the outside of the joint 4 Provided with a cylindrical assembly portion 5 that is assembled to the mouth tube portion of the container body so that the content liquid is not discharged during transportation, etc., and a nozzle portion 6 that projects to the upper end side of the body portion 2. Configured. The nozzle portion 6 has a tip that extends forward from the top portion 2 </ b> A of the main body portion 2 curved downward, and a discharge passage 8 that extends to the hollow portion 7 provided inside the joint portion 4 inside the nozzle portion 6. Is formed. A skirt portion 9 is integrally suspended from the periphery of the circular top portion 2A.

  The head 1 is manufactured using, for example, a mold as shown in FIG. 5, and the mold shown in the present embodiment is roughly divided into two, a fixed mold 10 and a slide mold 20.

  As shown in FIG. 5, the fixed mold 10 forms a first fixed mold 11 for forming a hollow portion 7 at a position below the nozzle section 6, and a joint section 4 together with the first fixed mold 11. A cylindrical second fixed mold 12 and a cylindrical third fixed mold 13 which is outside the second fixed mold 12 and forms the lower side of the assembly part 4 and the nozzle part 6. In addition, a cylindrical fourth fixed mold 14 that forms the upper side of the nozzle unit 6 at a position above the nozzle unit 6 is provided. The third fixed mold 13 is formed with a recess 13A for mounting a closing body 16 to be described later, and a holding mold 15 for holding the closed body 16 after mounting is attached to the recess 13A. The holding mold 15 communicates with the first cavity C1 formed by the first to fourth fixed molds 11, 12, 13 and 14 and the slide mold 20, and the molten first resin material is used. A first gate 31 to be injected and a runner 32 for guiding the first resin material to the first gate 31 are provided. The first gate 31 is provided at an inconspicuous position behind the nozzle portion 6 in the skirt portion 9.

  As shown in FIG. 8, the slide mold 20 is provided inside the fourth fixed mold 14 so as to be movable along the vertical direction in the figure, and the lower first to third fixed molds 11. , 12 and 13 can be set to a first molding position P1 and a second molding position P2 slightly apart from the first molding position toward the upper side in the figure. The slide mold 20 communicates with a second cavity C2 formed between the top 2A of the main body 2 and the slide mold 20, and a second gate 33 for injecting a second resin material and a second resin material. A runner 34 is provided to guide the current to the second gate 33. The shape of the second gate 33 is a mortar shape that gradually decreases in diameter, and a straight portion 33a that extends slightly linearly is formed at the lower end thereof.

  As shown in FIG. 5, a through hole 13a extending in the vertical direction is formed in the third fixed mold 13 at a position facing the second gate 33, and a tip 16A is formed in the first through hole 13a. A pin-like (or needle-like) closure body 16 protruding into the cavity C1 is inserted. The tip 16A of the closing body 16 shown in the first embodiment is formed as a flat surface having an area larger than that of the second gate 33 (see FIG. 6). Note that the lower end of the through hole 13a communicates with the recess 13A, and the closing body 16 can be inserted into the through hole 13a through the recess 13A in a state where the holding mold 15 is removed.

  Further, a passage molding pin 17 for forming a discharge passage 8 in the nozzle portion 6 at a portion where the first fixed mold 11 to the third fixed mold 13 and the slide mold 20 and the fourth fixed mold face each other. Is provided.

  Next, a method for manufacturing a head (two-color molded product) using the mold will be described.

  6 to 9 show the steps of the method for manufacturing a two-color molded product using the mold shown in the first embodiment, and FIG. 6 shows the main part A before filling the first resin material as the first step ( FIG. 7 is an enlarged sectional view showing the details of FIG. 5), FIG. 7 is an enlarged sectional view showing a state in which the first resin material is filled in the mold as the second step, and FIG. 8 is a movement of the slide die as the third step. FIG. 9 is an enlarged sectional view showing a state in which the second resin material is filled in the mold as the fourth step. FIG. 10 is a sectional view showing a main part A of the two-color molded product manufactured by the two-color molded product manufacturing method using the mold shown in the first embodiment.

  The head 1 is manufactured using a mold assembled in the state shown in FIG. 5. First, as shown in FIG. 6, the slide mold 20 is moved downward, and the first fixed mold 11 and the second fixed mold on the lower side are moved. The first cavity C <b> 1 is formed by being disposed at the first molding position P <b> 1 approaching the third fixed mold 13 including the mold 12 and the closing body 16. At the same time, the flat surface which is the tip 16A of the closing body 16 abuts on the second gate 33 on the slide mold 20 side, so that the second gate 33 is set in the closed state (first step).

  Next, as shown in FIG. 7, the melted first resin material 41 is injected and filled into the first cavity C1 through the runner 32 and the first gate 31 to form the main body 2 (second step). ). In this second step, since the second gate 33 is set in the closed state in the previous first step, the first resin material injected from the first gate 31 enters the second gate 33. Can be prevented.

  Next, as shown in FIG. 8, the slide mold 20 is separated upward from the third fixed mold 13 including the first fixed mold 11, the second fixed mold 12, and the closing body 16 on the lower side. The second cavity C2 is formed between the slide mold 20 and the main body 2 in the first cavity C1. At the same time, the flat surface which is the tip 16A of the closing body 16 is separated from the second gate 33, so that the closed state of the second gate 33 is released (third step).

  Finally, as shown in FIG. 9, the second resin material 42 in a molten state is injected and filled into the second cavity C <b> 2 through the runner 34 and the second gate 33. The outer layer 3 is laminated on (fourth step).

  As shown in FIG. 10, when the mold is removed, a pore-like trace 2a is formed on the lower surface of the top portion 2A of the main body 2 as a trace of the closure body 16 being pulled out (see FIG. 3). The head 1 in which the gate trace 3a by the second gate 33 is formed in a concave shape on the surface of the outer layer 3 and at a position facing the trace 2a can be obtained (see FIG. 2).

  Next, a second embodiment using another mold will be described.

  FIG. 11 is an enlarged perspective view showing the front end of the closing body in the second embodiment. 12 to 15 show the steps of the method for manufacturing a two-color molded article using the mold shown in the second embodiment, and FIG. 12 shows the main part before filling the first resin material as the first step. FIG. 13 is an enlarged sectional view showing the details of A (see FIG. 5), FIG. 13 is an enlarged sectional view showing a state in which the first resin material is filled in the mold as the second step, and FIG. 14 is a slide die as the third step. FIG. 15 is an enlarged sectional view showing a state in which the second resin material is filled in the mold as the fourth step. FIG. 16 is a sectional view showing a main part A of the two-color molded product manufactured by the two-color molded product manufacturing method using the mold shown in the second embodiment.

  The second embodiment is different from the first embodiment in the configuration of the closing body 16 disposed in the third fixed mold 13, and the other configurations are the same as those in the first embodiment.

That is, as shown in FIG. 11, the distal end 16A of the closing body 16 of the second embodiment includes a truncated cone-shaped enlarged diameter portion 16a, a short columnar insertion portion 16b provided thereon, and a further upper portion thereof. The taper-shaped cusp 16c provided in the is integrally formed. The outer diameter dimension of the insertion portion 16b is slightly smaller than the inner diameter dimension of the straight portion 33a of the second gate 33, and the insertion portion 16b can be inserted into the straight portion 33a. The distal end 16A of the closing body 16 is set to protrude into the first cavity C1.
The closing body 16 can be exchanged through the recess 13A by removing the holding mold 15 from the third fixed mold 13.

  First, as shown in FIG. 12, the slide mold 20 is moved downward to approach the third fixed mold 13 including the first fixed mold 11, the second fixed mold 12, and the closing body 16 on the lower side. The first cavity C1 is formed at the first molding position P1. At the same time, the pointed head 16c, which is the tip 16A of the closing body 16, is inserted into the second gate 33 on the slide mold 20 side, and the insertion portion 16b is closely fitted to the inner wall of the straight portion 33a. The enlarged diameter portion 16a closes the lower end of the second gate 33, thereby setting the second gate 33 in a completely closed state (first step).

  Next, as shown in FIG. 13, the melted first resin material 41 is injected and filled into the first cavity C <b> 1 through the first gate 31 to form the main body 2 (second step). Also in the second step, the closing body 16 reliably sets the second gate 33 in the closed state in the first step, so that the first resin material injected from the first gate 31 is in the second gate 33. It is possible to prevent intrusion.

  Next, as shown in FIG. 14, the slide mold 20 is separated upward from the third fixed mold 13 including the first fixed mold 11, the second fixed mold 12, and the closing body 16 on the lower side. The second cavity C2 is formed between the slide mold 20 and the main body 2 in the first cavity C1. At the same time, the distal end 16A of the closing body 16 comes out of the second gate 33, so that the closed state of the second gate 33 is released (third step).

  Finally, as shown in FIG. 15, the second resin material 42 in a molten state is injected and filled into the second cavity C <b> 2 through the runner 34 and the second gate 33, so that the top 2 </ b> A of the main body 2 is The outer layer 3 is laminated on (fourth step).

  Then, as shown in FIG. 16, when the mold is removed, a pore-like trace 2a is formed on the lower surface (back surface) of the top 2A of the main body 2 as a trace of the closure 16 being removed (FIG. 3). As a result, the head 1 is obtained in which the gate trace 3a formed by the second gate 33 is formed in a concave shape on the surface of the outer layer 3 and at a position facing the trace 2a (see FIG. 2).

  As mentioned above, although the structure of this invention and its effect were demonstrated along the Example, embodiment of this invention is not limited to the said Example.

  For example, in the first and second embodiments described above, the closing body 16 is provided separately from the fixed mold 10, and the structure is shown in which it is mounted in the through hole 13 a of the third fixed mold 13 during assembly. The present invention is not limited to the above embodiment, and may be configured such that the closing body 16 is integrally projected in advance at a predetermined position of the third fixed mold 13. Alternatively, the second gate 33 is disposed on the fixed mold 10 side, the closing body 16 is integrally formed on the slide mold 20 side facing the second gate 33, and the fixed mold is formed by the sliding body 20 on the slide mold 20 side that has been slid. The second gate 33 on the mold 10 side may be closed.

  Moreover, although the said Example demonstrated using the two-color molded product and the head 1 of a hand-pump type pump, it can also be set as the cover part of a compact container for cosmetics. In the case of a compact container, a mirror is provided on the inner surface (lower surface) of the lid, but the mirror can hide the trace 2a formed on the back side of the lid when the closure 16 is removed. This is preferable in terms of points.

  Moreover, in the said Example, although it does not mention in particular about the time from the filling of the 1st resin material 41 of a 2nd process to the 2nd resin material 42 of a 4th process, the preferable time interval between this is 10--10. 15 seconds.

  Further, the closing body 16 is urged by a spring so that the front end 16A of the closing body 16 is elastically pressed against the second gate 33, thereby increasing the degree of adhesion between the front end 16A of the closing body 16 and the second gate 33. You may make it raise prevention of invasion of material.

  INDUSTRIAL APPLICABILITY The present invention can be used in a wider area in the field of manufacturing containers for two-color molded products.

DESCRIPTION OF SYMBOLS 1: Head 2: Main-body part 2A: Top part 2a: Extract 3: Outer layer 3a: Gate trace 4: Joint part 5: Assembly part 6: Nozzle part 7: Hollow part 8: Discharge passage 9: Skirt part 10: Fixed metal Mold 11: First fixed mold 12: Second fixed mold 13: Third fixed mold 13A: Recess 13a: Through hole 14: Fourth fixed mold 15: Holding mold 16: Closed body 16A: Closed body Tip 16a: Expanded portion 16b: Insertion portion 16c: Pointed head 17: Path molding pin 20: Slide mold 31: First gate 32: Runner 33: Second gate 33a: Straight portion 34: Runner 41: First Resin material 42: Second resin material C1: First cavity C2: Second cavity P1: First molding position P2: Second molding position

Claims (8)

A fixed mold (10) having a first gate (31) for injecting a first resin material (41) to form a main body (2), and being able to contact and separate from the fixed mold (10) and a injection to the body portion (2) to the outer layer (3) sliding die having a second gate stacked (33) to (20) the arranged by and a second resin material (42), the fixed The first resin material (41) is injected into a first cavity (C1) formed between the mold (10) and the slide mold (20), and the first resin material (41) is injected into a second cavity (C2). A two-color molding die into which two resin materials (42) are injected, the position facing the second gate (33) on the stationary die (10) side and the slide die (20) side to the second gate when said first resin material (41) is injected into the first cavity (C1) in A function of forming pores by抜跡(2a) to the body portion (2) while closing the door (33), is and injected into the second resin material (42) said second cavity (C2) The two-color molding die is characterized by having a closing body (16) having a function of releasing the closing of the second gate (33) and closing the hole .   The two-color molding die according to claim 1, wherein the closing body (16) has a flat surface that closes against the second gate (33) at the tip (16A) of the pin.   2. The two-color molding gold according to claim 1, wherein the closing body (16) has an insertion portion (16 b) close to the inner wall of the second gate (33) at the tip end (16 </ b> A) of the pin. Type.   The two-color molding die according to claim 3, wherein a straight portion (33a) is provided at the tip of the second gate (33). A method for producing a two-color molded product using the two-color molding die according to any one of claims 1 to 4, wherein the slide die (20) is arranged close to the fixed die (10). And forming the first cavity (C1) and closing the second gate (33) with the closing body (16), and the first resin material (41) injected from the first gate (31). ) To fill the first cavity (C1) to form the main body (2) and to form a hole in the main body (2) by the closing body (16), and the slide mold (20) is slid to a position away from the fixed mold (10) to form a second cavity (C2) between the slide mold (20) and the main body (2), and the closing body Third step of releasing the closing of the second gate (33) by (16) A second resin material (42) injected from the second gate (33) fills the second cavity (C2) and laminates an outer layer (3) on the main body (2). 4 steps, The manufacturing method of the two-color molded article characterized by the above-mentioned.   The first step includes a step of bringing the flat surface of the pin tip (16A) constituting the closing body (16) into contact with the second gate (33), and the third step includes the flat surface from the second gate (33). The method for producing a two-color molded article according to claim 5, comprising a step of separating.   The first step includes the step of closely fitting the insertion portion (16b) of the pin tip (16A) constituting the closing body (16) to the inner wall of the second gate (33), and the third step is the second gate (33). The method for producing a two-color molded article according to claim 5, further comprising a step of removing the insertion portion (16 b). The outer layer (3) is formed on the upper surface of the main body (2) formed by the two-color molding die according to any one of claims 1 to 4 and formed by the first resin material (41). A two-color molded product in which the second resin material (42) is laminated,
A bottom surface of the main body (2) made of the first resin material (41) has a pore-shaped trace (2a) formed when the closure body (16) is removed, and the outer layer (3 2) A two-color molded product having a concave gate mark (3a) at a position opposite to the trace (2a).