JPH0478513A - Method and device for molding heterochromatic molded form - Google Patents

Abstract

PURPOSE:To mold a molded form capable of showing the inside part of a product such as a heterochromatic pattern at the center of the outside part of the product in the inside of the same mold by moving floating core pair at a primary molding position, injecting and filling molten resin into a first cavity and curing it and thereafter moving the floating core pair at the secondary molding position, injecting and filling heterochromatic molten resin into a second cavity. CONSTITUTION:A mold device 10 is clamped and a floating core pair 26 is moved at a primary molding position by actuating a floating core actuation mechanism 30 in the forward direction. Molten resin 8a is injected and filled into a first cavity 20 from a main injection molding machine. A primary molded form 8 is molded wherein a butt middle hinge part 3 is integrated with a pattern 2. The floating core pair is moved at the secondary molding position wherein the external peripheral part of the primary molded form 8 closes the aperture parts of the hole sides of the second cavities 21, 22. Heterochromatic molten resin is injected and filled into the second cavities 21, 22 from the sub-injection molding machines 35, 36 and secondary molding is performed. A secondary molded form 9a is integrated with the primary molded form 8. A heterochromatic molded form 1 is obtained in which the butt both-sides hinge parts 5, 6 of the secondary molded form 9b are hinged on the butt middle hinge part 3 of the primary molded form 8.

Description

[Detailed description of the invention] [Industrial application field] This invention is a unique product in which a primary molded product and a secondary molded product are integrated by sequentially injecting and filling a first cavity and a second cavity with a unique molten resin. The present invention relates to a molding method and apparatus for obtaining a molded article.

[Conventional technology]

Conventionally, a technique disclosed in Japanese Patent Laid-Open No. 63-293023 has been known as a method and apparatus for molding a uniquely colored molded article as described above.

[Problem to be solved by the invention]

The conventional molding method and device include a fixed mold plate (female mold)
The first movable mold body and the second movable mold body are installed in a part of the molded product and are movable in the mold release direction, and the first movable mold body and the second movable mold body are moved in the direction of the movable mold plate (male mold). With the second cavity protruded and the second cavity closed, molten resin is injected and filled into the first cavity (formed as a gap remaining between the female fixed mold plate and the male movable mold plate). perform primary forming, then retreat the first movable mold body and the second movable mold body,
A second cavity that opens inside the primary molded product and a runner secured between the retreated second movable mold body and the primary molded product are formed, and a unique melting liquid flows from this runner into the second cavity. Since secondary molding is performed by injection filling the resin, it is necessary to form a runner for injecting the secondary material between the primary molded product and the second movable mold during secondary molding. Tame 1
The movements of the movable mold body and the second movable mold body must be linked using a connecting bottle or the like, which increases the complexity of the device structure. Moreover, if a runner for secondary material injection is formed between the primary molded product and the second movable mold body, the surface layer (corresponding to the runner) of the primary molded product formed as the outer shell of the product can be used as the inner part of the product. There is a problem of color mixing (partial color mixing) in which different colored materials of the secondary molded product partially overlap, so do not partially mix colors on the inner part of the product such as a different colored pattern designed in the center of the outer part of the product. It was impossible to create a unique color that would appear like this.

This invention was made in order to solve the above-mentioned conventional problems, and its purpose is to provide a relatively simple design and structure, but the inner part of the product has a unique pattern designed in the center of the outer part of the product. An object of the present invention is to provide a method for molding a molded article with different colors and an apparatus therefor, in which molded articles with different colors can be molded in the same mold without causing partial color mixing.

[Means to solve the problem]

In order to achieve the above object, the method for molding a different-colored molded product of the present invention involves sequentially injecting and filling a first cavity and a second cavity with different-colored molten resin, so that the primary molded product and the secondary molded product are integrated. The second cavity is formed in a part of an openable and closable mold device including a fixed side mold plate and a movable side mold plate that form a closed mold of the second cavity. A floating piece inner hole to be opened is provided, and a pair of floating pieces which can be opened and closed and which form a side-opening first cavity are incorporated into the floating piece inner hole so as to be movable between a primary molding position and a secondary molding position. Primary molding using a pin gate method is performed in which molten resin is injected into the first cavity while the floating piece pair is moved and stopped at the primary molding position, and after the primary molded product is cured, the floating piece pair is moved to the outer peripheral part of the primary molded product. is moved to the secondary molding position where it closes the opening on the hole side of the second cavity, and while the floating piece pair is stopped moving to the secondary molding position, the second cavity is injected and filled with a different color molten resin.Secondary molding The method is characterized in that it molds a unique molded product in which the primary molded product and the secondary molded product are integrated.

Furthermore, the apparatus for molding a different-colored molded product of the present invention sequentially injects and fills the first cavity and the second cavity with different-colored molten resin, thereby producing a different-colored molded product in which the primary molded product and the secondary molded product are integrated. A mold device that can be opened and closed for molding a secondary molded product, and includes a fixed number plate and a movable side mounting plate that are attached to the fixed plate and movable plate of an injection molding machine, and a spool bushing. A stripper plate that comes into contact with and separates from the fixed side mounting plate, a fixed side mold plate that is fixed to this stripper plate via a fixed base, and a fixed side template that is fixed and fixed to the movable side mounting plate via a spacer block and a receiving plate. and a movable side mold plate that forms a second cavity between the side mold plate and the movable side mold plate, and a floating piece in which the second cavity opens in a part of the fixed base, the fixed side mold plate, and the movable side mold plate. A first floating piece that has an interior hole and into which a spool bushing is inserted; and a second floating piece that closes and forms a first cavity with a side opening between the first floating piece and the first floating piece. A pair of floating pieces that can be opened and closed are assembled so as to be able to move in the mold opening/closing direction in close contact with the inner wall surface of the inner wall of the floating piece, and a floating piece actuating mechanism that incorporates this pair of floating pieces into a spacer block opens the first cavity. so that it can move between a primary molding position where the side opening of the floating piece is closed by the inner wall surface of the inner hole of the floating piece, and a secondary molding position where the outer periphery of the primary molded product closes the hole side opening of the second cavity. It is characterized by the following.

[Effect]

In the method and apparatus for molding a uniquely colored molded product of the present invention, with the pair of floating pieces moved and stopped at the primary molding position,
The part that will become the inner part of the product (for example, a designed unique color pattern, etc.) is first molded in the first cavity of the pair of floating pieces, and with the pair of floating pieces moved and stopped at the secondary molding position, the outer part of the product and (for example, the outer part of the case with a unique pattern in the center) is second-molded in the second cavity between the templates to create a primary molded product that is the inner part of the product and a secondary molded product that is the outer part of the product. Obtain a unique molded product that is completely integrated (primary and secondary interfaces are welded).

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show the molding method of the present invention and a molding device for carrying out the method. This molding device is used to produce, for example, a unique molded product 1 as shown in FIG. A case lid 4 with a unique color pattern 2 arranged in the center and a hinge part 3 in the same color as the unique color pattern 2 on one side, and this case lid 4.
The hinge parts 56 on both sides of the hinge are pivotally supported on the middle hinge part 3 of the hinge.
The mold apparatus 10 is equipped with a mold device 10 for molding a uniquely colored molded product 1 consisting of a case body 7 having

This mold device 10 primarily molds the unique color pattern 2 and the hinge part 3 as a red primary molded product 8, and
For example, the outer part of the case lid 4 excluding the middle hinge part 3 is made into a green secondary molded product 9a, and the hinge parts 5 and 6 on both sides of the hinge are made into a green secondary molded product 9a.
For example, the case body 7 having the following shape is second-molded as an orange-colored secondary molded product 9b, and its structure includes a fixed-side mounting plate that is attached to a fixed platen and a movable platen (not shown) of the main injection molding machine. 11, a movable mounting plate 12, a stripper plate I4 having a spool bush 13 communicating with the runner runner 11a of the fixed mounting plate 11, and arranged so as to approach and separate from the fixed mounting plate 11, and the stripper plate I4. Between the fixed side template 16 fixed to the plate 4 via the fixed base I5 and the fixed side template 16 fixed to the movable side mounting plate 12 via the spacer block 18 and the receiving plate 19, 2 cavities 21
．． 22 (the gap for molding the secondary molded products 9a, 9b) and a movable mold plate 17 that closes and forms the mold. Then, a floating piece interior hole H through which the second cavity 21, 22 opens is provided in a part of the fixed base 15, fixed side mold plate 16, and movable side template 17, and a spool bushing is provided in this floating piece interior hole H. An openable and closable floating piece consisting of a first floating piece 24 having three insertion holes 23, and a second floating piece 25 that closes and forms a first cavity 20 with a side opening between the first floating piece 24. The floating piece pair 26 is assembled so as to be movable in the mold opening/closing direction in close contact with the inner wall surface of the floating piece interior hole H, and the floating piece pair 2B is moved by the floating piece actuating mechanism 30 so that the side opening of the first cavity 20 becomes a floating piece. The primary molding position is closed by the inner wall surface of the interior hole H as shown in FIGS. 1(A) and (B), and the outer peripheral part of the primary molded product 8
Cavity 21. - It is configured so that it can be switched to the secondary forming position where the hole side opening of No. 22 is closed as shown in FIG. 1(C). The first floating piece 24 has a flange 24a that engages with an enlarged diameter hole 27 for regulating the movement stroke, and is controlled in the direction of the second floating piece 25 by a spring 28 interposed between it and the stripper plate 14. The first floating piece 24 and the second floating piece 25 have a protrusion (not shown) on the opposite side to secure the first cavity 20 having a side opening.
It is provided at a position that avoids the area that becomes the primary and secondary interface.

The floating piece actuating mechanism 30 is installed on the spacer block 18, and is fixed to the second floating piece 25 and movably passes through the communication hole J9a of the receiving plate 19 to connect the spacer block 1ε.
It has a floating piece operating rod 3I extending inward, and a cam groove 32 that slides into engagement with the end engager 31a of this floating piece operating rod 31. By changing the slide of the cam groove, the floating piece pair 26 is moved to the primary position. A sliding floating piece operating cam 33 that switches between the forming position and the secondary forming position, and this l″y, piece operating cam 3.
The hydraulic cylinder 34 has a piston rod 34a connected to the spacer block 18 and moves the floating piece actuating cam 33 forward and backward within the spacer block 18 in a direction perpendicular to the mold opening/closing direction.

Reference numerals 21a and 22a shown in FIG. 2 are runners for injecting and filling the second cavity 21 and 22 with molten resin.
A unique melt F! is formed in the mold matching part of No. 7, and from the sub-injection molding machines 85 and 36 placed on both sides thereof. ! I! Resin is injected. In addition, this sub-injection molding machine 35, 36 has a second mold on the side of the fixed or movable mold.
Installed as shown in the diagram.

Next, a method for molding the uniquely colored molded product 1 shown in FIG. 3 using the molding apparatus configured as described above will be described. First, the floating piece actuating mechanism 30 is operated in the forward direction in the mold clamping state of the mold apparatus 1O, and the floating piece pair 26 is integrated with the first floating piece 24 and the second floating piece 25 by advancing the floating piece operating cam 33. In this state, it is moved to the primary forming position shown in FIGS. 1(A) and 1(B). Then, while the floating piece pair 26 is stopped moving to the primary molding position, the molten resin 8a is injected from the main injection molding machine (not shown) into the first cavity 20 via the runner 11a and the spool bush 13. As shown in FIG. 1 (B), primary molding is performed using a pin gate method such as injection filling), thereby molding a primary molded product 8, such as a red color, in which the pattern 2 and the hinge part 3 are integrated.

Next, after the primary molded product 8 has hardened, the floating piece actuating mechanism 30 is operated in the backward direction, and the floating piece actuating cam 33 moves back to move the floating piece pair 26 so that the outer peripheral part of the primary molded product 8 is in the second cavity 21,22. The first one is placed at the secondary forming position to close the opening on the hole side.
Move it as shown in figure (C).

Then, while the floating piece pair 26 is stopped moving to the secondary molding position, the runner 35a is removed from the sub-injection molding machine 35, 38.

Secondary molding is performed by injecting and filling a different color molten resin into the second cavity 21.22 through 36a, and the primary molded product 8 is formed.
and the secondary molded product 9a (outer part of the case lid 4) are integrated to be welded at the primary and secondary interface, and the secondary molded product 9b (case body 7) is attached to the hinge part 3 of the primary molded product 8. Unique molded product 1 shown in Fig. 2 with hinge parts 5 and 6 on both sides hinged
get.

The unique molded product 1 molded in this way is manufactured by the mold device 1
0 is opened from the mold as shown in FIG. 1(D), and released from the mold by ejecting it as shown by the imaginary line in FIG. taken out. The symbol S shown in FIG. 1(D) is a spool runner.

In addition, in the above embodiment, the method and apparatus for molding the unique pattern 2 and the middle hinge part 3 as the primary molded product 8, and the case lid 4 and the case body 7 as the secondary molded products 9a, 9b, were explained. The inner part of the product such as the unique color pattern arranged in the center is the primary molded product 8, and the outer part of the product such as the case lid 4 (
The present invention can also be applied to a method and apparatus for molding the outer part of the product into a secondary molded product 9a with a different color.

〔Effect of the invention〕

Since the method and apparatus for molding a uniquely colored molded product of the present invention are as described above, although the device structure is relatively simple, the inner part of the product has a uniquely colored pattern designed in the center of the outer part of the product. Molded products with different colors can be easily molded in the same mold without causing partial color mixing.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention, where Figure 1 (A) is a cross-sectional view of the mold showing the state before resin injection, and Figure 1 (B) is a mold that undergoes primary molding. Mold sectional view in condition, 1st
Figure (C) is a cross-sectional view of the mold in a state where secondary forming is performed, Figure 1 (D) is a cross-sectional view of the mold in an open state to take out the molded product, and Figure 2
The figure is a cross-sectional plan view taken along the line ■--■ in FIG. 1(C), and FIG. 3 is a perspective view of a uniquely colored molded product molded by the method and apparatus of the present invention. 1... Different color molded product, 2... Different color pattern, 3... Middle hinge part, 4... Case 7. M, 5.6--Hinge on both sides, 7--Case body, 8--Primary molded product,
9a... Secondary molded product formed as the outer shell of the case lid,
9b... Secondary molded product molded as a case body, 10.
... Mold device, 11... Fixed side mounting plate, 12... Movable side mounting plate, 13... Spool bush, I4...
Stripper plate, +5... Fixed base, 16... Fixed side template, +7... Movable side template, 18... Spacer block, 19... Receiving plate, 20... First cavity,
21, 22...Second cavity, 24...First floating piece, 25...Second floating piece, 26...Floating piece pair, H...Floating piece interior hole, 28...Spring , 30... Floating piece operating mechanism, 31... Floating piece operating rod, 31a... Engagement element at rod end, 32... Cam groove, 33... Floating piece operating cam, 34... Hydraulic cylinder, 35.36...Sub injection molding machine. Applicant's agent Patent attorney Takehiko Suzue Figure 1 (B) Figure 1 (A) Figure 1 (C)

Claims (2)

[Claims] (1) In a molding method in which a first cavity and a second cavity are sequentially injected and filled with different colored molten resins to obtain a different colored molded product in which a primary molded product and a secondary molded product are integrated, the second
A part of the openable and closable mold device including the fixed side mold plate and the movable side mold plate that closes the cavity is provided with a floating piece inner hole through which the second cavity opens, and a side opening is provided in this floating piece inner hole. A pair of floating pieces that can be opened and closed forming the first cavity is installed so as to be movable between the primary molding position and the secondary molding position, and with the pair of floating pieces stopped at the primary molding position, the pair of floating pieces is moved into the first cavity. Primary molding is performed using a pin gate method in which molten resin is injected and filled, and after the primary molded product has hardened, the floating piece pair is moved to a secondary molding position where the outer periphery of the primary molded product closes the opening on the hole side of the second cavity. Then, while the floating piece pair is stopped moving to the secondary molding position, secondary molding is performed by injecting and filling a unique molten resin into the second cavity, resulting in a unique product in which the primary molded product and the secondary molded product are integrated. A method for forming a unique molded product, which is characterized by obtaining a molded product. (2) In a molding device that sequentially injects and fills a first cavity and a second cavity with different colored molten resins to obtain a different colored molded product in which the primary molded product and the secondary molded product are integrated, the secondary molded product is A mold device that can be opened and closed for molding has a fixed side mounting plate and a movable side mounting plate that are attached to a fixed platen and a movable platen of an injection molding machine, and a stripper plate that has a spool bush and moves toward and away from the fixed side mounting plate; A second cavity is formed between the fixed side template that is fixed to this stripper plate via the fixed base and the fixed side template that is fixed to the movable side mounting plate via the spacer block and the receiving plate. a movable side mold plate, and a floating piece interior hole through which a second cavity opens is provided in the fixed base, a part of the fixed side mold plate, and a part of the movable side template;
An openable and closable floating piece consisting of a first floating piece into which a spool bush is fitted into the floating piece interior hole, and a second floating piece that closes and forms a first cavity with a side opening between the first floating piece and the first floating piece. The floating piece pair is assembled so as to be movable in the mold opening/closing direction in close contact with the inner wall surface of the floating piece inner hole, and this floating piece pair is installed in the first cavity where the side opening of the first cavity is closed by the inner wall surface of the floating piece inner hole. A floating piece actuation mechanism is incorporated into the spacer block so that it can be moved between the molding position and the secondary molding position where the outer periphery of the primary molded product closes the hole-side opening of the second cavity. Molding equipment for unique molded products.