JPH02167713A - Molding method for molded synthetic resin article laminated with skin material - Google Patents

Abstract

PURPOSE:To make appearance of the joint part of skin material good and to eliminate the need for an adhesive by mutually overlapping the respective end edge parts of two sheets of skin material along an insert groove on a male mold with the insert groove formed thereon, pressing and fixing the joint part of skin material with a pressing word provided via a spring on a female die. CONSTITUTION:Both the end edge of one skin material 9 and the end edge of the other skin surface 9' are overlapped along the central part of an insert grooves 2a and placed on a male mold 2 in a mold opening state. The residual end edges of skin materials 9, 9' are stuck with pins 5 respectively and fixed. When a female mold 3 is moved on the male mold 2 and the end part of an opening side of a recessing part 3b is allowed to abut against both skin materials 9, 9', molten synthetic resin 10 is supplied between both skin materials 9, 9' and the male mold 2 through the respective supply ports 2c. Thereafter when mold clamping is performed, molten synthetic resin 10 is fluidized to the whole cavity. A pressing rod 4 is pushed back into a fitting groove 3a by the pressure thereof while resisting the repulsive force of a spring 6. Both skin materials 9, 9' and molten synthetic resin 10 are molded and simultaneously laminated together.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Separation 1] The present invention relates to a method for manufacturing a synthetic resin product in which skin materials are laminated, each skin material having a linear connecting portion.

[Prior art] Conventional methods for manufacturing synthetic resin products in which two-tone skin materials are laminated onto a synthetic resin base material include injection molding of thermoplastic synthetic resin such as polypropylene, polyethylene, ABS, etc. to form the base material. Then, on one side of the base material, two skin materials with different colors and patterns are stacked with their edges butted against each other via adhesive, and then inserted into a pressure pipe mold and crimped. method is known.

[Problems to be Solved by the Invention] The conventional method described above requires two fJ1 type molds, one for molding the base material and one for crimping the skin material, which increases the cost of the molds. When crimping the base material, the skin material may shift and the boundary line of the skin material may not be straight, resulting in poor appearance. There was a problem in that there was a risk that it would form or, in some cases, break.

The present invention has been made in view of the problems of the above-mentioned conventional techniques, and provides a process that provides beautiful straightness at the joints of skin materials, provides a good appearance, and does not require adhesives. The object of the present invention is to provide a simplified method for laminating a skin material on a synthetic resin base material.

[Means for Solving the Problems] In order to achieve the above object, the method of the present invention includes inserting one end edge of each of two skin materials onto a male die in which a long insert groove of the book is formed. Once the joints are formed by overlapping each other along the grooves, the remaining peripheral edges of both skin materials are placed in a fixed state in step 6, and then the fittings formed at the portions facing the insert grooves are placed. By moving the female mold, which has a recessed part equipped with a presser bar provided through a groove and a spring, toward the male mold, the joint portion of both skin materials is pressed and fixed by the presser bar, and both of the skin materials are pressed and fixed immediately before mold clamping. After the molten synthetic resin is supplied between the skin material and the male mold, the mold is clamped and the molten synthetic resin flows throughout the cavity.

Further, it is preferable to form a plurality of notches at the tip of the presser bar.

[Effect]

With the mold open, one end edge of one skin material and one end edge of the other skin material are overlapped along the insert groove on the male mold in which a single long insert groove has been formed. At the same time, the remaining peripheral edges of both skin materials are placed on the sides of the male mold in a fixed state. Next, by moving the female die, which has a fitting groove formed in a portion facing the insert groove and a concave portion having a presser bar biased toward the male die, toward the male die, both of the skin materials are removed. The joint part of the mold is pressed and fixed with a presser bar, and just before the mold is clamped, that is, when the open end of the female mold's recess is in contact with both skin materials, the molten synthetic resin is supplied from the plasticizing device through the supply port. It is supplied between both skin materials and the female mold. After that, when the female mold is further moved to the male mold side and the mold is clamped, the molten synthetic resin flows throughout the cavity, and the pressure causes the presser bar to resist the elastic force of the spring and move into the female mold's fitting groove. The lower part of the joint where both skin materials overlap is also filled with molten synthetic resin, and both skin materials and molten synthetic resin are laminated at the same time as molding.

In addition, when the joint of both skin materials is pressed with a presser bar with multiple notches formed at the tip, the overlapping joint of both skin materials will move slightly toward the female mold side at each notch. A molded article is formed in which the molten synthetic resin flows into the protruding center.

〔Example〕

Examples will be described based on the drawings.

As shown in FIGS. 1 and 2, a mold 1 used for carrying out the present invention is composed of a female mold 3 and a male mold 2, which are respectively attached to a movable plate and a fixed plate of a mold clamping device (not shown). ing. A plurality of pins 5 are implanted at intervals on the side surface of the male mold 2, and an insert groove 2a is formed approximately in the center of the surface facing the female mold 3. .

On the other hand, the female mold 3 has a recess 3b that fits into the male mold 2 to form a cavity when the mold is clamped, and a mounting plate is provided in the recess 3b facing the insert groove 2a of the male mold 2. A fitting groove 38 reaching 3C is formed. Furthermore, one ends of a plurality of springs 6 are fixed to the mounting plate 3C at intervals along the fitting groove 3a, and a presser bar 4 having a shape that can be fitted into the insert groove 28 is fixed to the free end of the springs 6. It is provided in a state where it is biased toward the male mold. Here, the elastic force of the spring 6 is set to such a magnitude that the presser rod 4 is pushed back into the fitting groove 38 by the pressure of the molten synthetic resin in the cavity when the mold is clamped.

Next, the steps of the method of the present invention will be explained.

As shown in FIG. 3, with the mold open, one end edge of one skin material 9 and one end edge of the other skin material 9' are overlapped on the male mold 2 along the center of the insert groove 28. A joint is formed and placed, and the remaining edges of the picture cover materials 9 and 9' are respectively pierced into the bins 5 and fixed. Next, as shown in FIG. 4, when the female mold 3 is moved toward the male mold 2 by a mold clamping device (not shown), and the open end of the recess 3b comes into contact with the image cover material 9.9'. A molten synthetic resin 10 is supplied between the picture surface materials 9, 9' and the male mold 2 through each supply port 2c by a plasticizing device (not shown). After that, when the female mold 3 is further moved toward the male mold 2 and the mold is clamped, the molten synthetic resin 10 flows throughout the cavity, and the presser rod 4 is fitted against the elastic force of the spring 6 due to the pressure. Pushed back into the groove 3a, the picture cover material 9,9' and the molten synthetic resin 10 are laminated at the same time as molding. At this time, the joint where the one end edges of the picture cover material 9 and 9' overlap is always pressed by the presser bar 4 which is urged toward the male mold side by the elastic force of the spring 6. Therefore, the picture surface material is 9.9'
The overlapped joints of the two do not shift, and beautiful straightness can be obtained at the joints between the two.

Next, other embodiments of the present invention will be described.

The presser bar 4' shown in FIG. 6 differs from the mold l of the first embodiment only in that a plurality of notches 4b are formed at intervals at its tip, and the other parts are This is the same as the mold 1 above.

The process of this practical gallery example will be explained based on FIGS. 7 to 1 Ω diagrams. FIGS.
In this state, as shown in FIG. 9 and FIG. Supply between. After that, when the female mold 3 is further moved in the direction of the male mold 2 and the mold is clamped, the internal pressure in the cavity increases, and the surface material 9.9 is pressed against the surface of the male mold 2 by the elastic force of the spring 6. ', including the overlapped joints 9.9. 'A gap 2b is created between the back surface and the surface of the male die 2, and the molten synthetic resin 10 flows through the gap 2b,
The picture cover material 9,9' and the molten synthetic resin 10 are laminated at the same time as molding. At this time, as shown in FIG. 10, the molten synthetic resin 1
Due to the zero pressure, the overlapping joint portions of the picture surface materials 9 and 9' protrude slightly, and a molded article is formed in which the molten synthetic resin flows into the center.

Furthermore, in each of the above embodiments, the subsequent process of supplying the molten synthetic resin 10 when the open end of the recess 3b of the female mold 3 comes into contact with the picture surface material 9,9' is changed, and the mold is After the mold is completely clamped, the molten synthetic resin 10 can be injected at high pressure between the picture cover material 9, 9' and the male mold 2.

Furthermore, in the method of the present invention, various materials commonly used in various molding processes can be used, and in addition, synthetic resins containing inorganic fillers such as calcium carbonate, barium sulfate, talc, and mica can also be used. Available for use.

Note that instead of providing a plurality of bottles 5 on the side of the male mold 2,
Although not shown, the peripheral edge of the skin material can also be fixed to the side of the male mold using a fastening member such as a fastening band.

(Effects of the Invention) Since the present invention is configured as described above, it has the following effects.

(1) The peripheral part of the picture surface material is fixed to the side of the male mold, and the joint is fixed by being pressed with a presser rod throughout the molding process, so the joint part may shift or wave during molding. There is no smearing, beautiful straightness is obtained at the joint, and a molded product with good appearance can be obtained.

(2) Since the picture surface material and the molten synthetic resin are laminated at the same time as molding, only one mold is used and mold holes can be reduced.

(3) When a presser bar with multiple notches is used, the overlapping joints of the image surface material will protrude at the notches during mold clamping, and the molten synthetic resin will flow into the center and join. Therefore, the adhesive strength of the joint is increased.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a mold used in carrying out the present invention;
The figure is a sectional view taken along the line A-A in Figure 1, and Figures 3 to 5 are second sectional views showing each step of the first embodiment of the present invention.
6 is an enlarged side view of the presser bar used in the second embodiment of the present invention, and FIGS.
FIG. 3 is an enlarged cross-sectional view of the main part showing each step of the example. 1...molding mold, 2...-male mold,
2a---Insert groove, 2b---Gap, 2C・
・・Supply port, 3---Female type, 3a...
Fitting groove, 3b--recess, 4.4'--presser bar, 4a--tip, 4b'--notch,
5... Bottle, 6... Spring, 9.9'... Skin material, 10... Molten synthetic resin. Patent applicant: Hayashi Telempu Co., Ltd.

Claims (1)

[Scope of Claims] 1. On a male mold (2) in which one long insert groove (2a) is formed, one end edge of each of the two skin materials (9, 9') is inserted into the insert groove. (2a) to form a joint, and place the remaining peripheral edges of both skin materials (9, 9') on the side surface of the male mold (2), and then , a fitting groove (3a) and a spring (6) formed in a portion facing the insert groove (2a).
a recess (3b) with a presser bar (4) provided through the
By moving the female mold (3) having ) is supplied between both skin materials (9, 9') and the male mold (2), the molds are clamped, and the molten synthetic resin (10) is made to flow throughout the cavity. Molding method. 2. The method for molding a synthetic resin molded article laminated with skin materials according to claim 1, wherein a plurality of notches (4b') are formed at the tip of the presser foot (4').