JPH10109327A - Production of resin molded object having skin on part of its surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage or wrinkling of a skin or to prevent the release with a base material resin by pressing the skin over the total length of the edge part thereof by a press ring and spreading a molten resin over the surface of the skin and also ejecting the molten resin even to the outside and subsequently allowing the press ring to retreat. SOLUTION: A skin 14 is set to the cavity surface of a moving mold 10 at a predetermined position. The moving mold 10 is allowed to advance to a predetermined position and the skin 14 is pressed over the total length thereof by the press ring 18 of a cylinder 19. At this time, a space part 20 of about 30mm is formed. A dumpling shaped molten resin is injected into the space part 20 and the moving mold 10 is allowed to advance until a compression flange becomes about 3-4mm to spread the molten resin on the surface of the skin 14 to be closely bonded thereto. Next, the molten resin is also injected into the outside of the space part 20 and the moving mold 10 is allowed to advance to compress the compression flange and the press ring 18 is allowed to retreat while the bonding of the molten resin in the space part 20 and the outside molten resin is achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a molded article having a skin on a part of the surface of the molded article, wherein the skin is arranged in a mold and integrally molded.

[0002]

2. Description of the Related Art In recent years, for interior parts of automobiles, a resin base material whose surface is coated with a skin such as PVC leather has been used, but such interior parts are manufactured by molding the skin from the viewpoint of cost and appearance. It is performed to arrange inside and to integrally mold.

The method will be described with reference to FIGS. 8 to 10. Referring to FIGS. 8 to 10, a skin 3 is set in a concave portion 2 in a female mold 1, a mold is closed while leaving a compression allowance δ with a male mold 4, and an injection gate 5 is formed. In this method, the molten resin that becomes the base resin 7 is injected into the mold cavity 6 from the mold, and the compression margin δ is compressed as shown in FIG.

[0004]

Therefore, when integrally molding the skin and the base resin as described above, the pressure of the injected resin is so high that the skin is damaged, wrinkles are formed, or the skin is positioned at a predetermined position. There were drawbacks such as deviation from In addition, since the molten resin was injected and compressed with both molds open with a small gap, the molten resin was difficult to reach the end of the cavity, and poor adhesion between the skin corresponding to the end and the base resin was likely to occur. And peeling of the base resin occurred.

It is an object of the present invention to provide a resin molding having a part of the surface without the defect that the surface is damaged or wrinkled as described above, or the defect that the surface resin is separated from the base resin. An object of the present invention is to provide a method for producing a body.

[0006]

In order to achieve the above-mentioned object, the present invention sets a skin on one side of both molds in a mold open state, and then uses a pressing ring provided on the other mold side to form the skin. While pressing the skin over the entire length of the edge, a space is formed on the surface of the skin in cooperation with the other mold, and the first injection device injects molten resin into the space in a dumpling manner, After compressing the molten resin in the space portion and expanding the resin on the skin surface with a predetermined compression allowance, the second injection device melts the resin in the mold cavity outside the space portion surrounded by the pressing ring. Injecting a resin, compressing the mold cavity by further compressing the compression allowance, and a method of manufacturing a resin molded body having a part of the surface having a surface so as to retreat the press ring from the surface of the surface. did.

[0007] The compression of the mold cavity after the injection of the molten resin by the second injection device is performed with the valve gate of the second injection device opened, and the skin is partially provided on the surface. A method for producing a resin molded article was used.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION After setting the skin on one side of both molds in the mold open state, the skin is pressed by a holding ring, and the skin is surrounded by the holding ring with the other mold. After injecting the molten resin in a dumpling shape, compressing and expanding the resin on the surface of the skin, the molten resin serving as the base material is injected into the mold cavity outside the space surrounded by the holding ring. The press ring is retracted from the surface of the skin while compressing the mold cavity, so that the skin portion is not subjected to pressure, and is therefore compression-molded using a mold that does not damage the skin portion. A method of manufacturing a resin molded body having a surface part to be injection-molded on a part of the surface except for a surface part requiring strength while achieving bonding with the resin in the enclosed space part.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 7. Reference numeral 10 denotes a movable die, which is mounted on a movable die plate 11 and moves forward and backward with respect to a fixed die 13 mounted on a fixed die plate 12. FIG. A mold cavity is formed with the fixed mold 13. The moving mold 1
0 is provided with a suction hole 15 for sucking the skin 14 with a vacuum pump or the like (not shown) and setting it on a predetermined cavity surface. The skin 14 is formed integrally with the base resin 17 of the product 16 as shown in FIG. 6, for example. In the molding, the movable mold 10 in which the skin 14 is set at a predetermined position moves forward (leftward in the figure). , When the mold is clamped leaving a predetermined compression allowance,
As shown in FIG. 7, a holding ring 18 for holding the entire length of the edge of the skin 14 is provided on the fixed mold 13, and the holding ring 18 is driven by a cylinder 19.

When the pressing ring 18 is pressed over the entire length of the edge of the skin 14, a space 20 is formed on the surface of the skin 14 in cooperation with the pressing ring 18 and the cavity surface of the fixed mold 13. It is supposed to be. The space 20 is provided with a first injection device 22 having a valve gate for injecting the molten resin 21 into the space 20 in a dumpling manner. Further, the fixed mold 13 has a mold cavity 23 outside the space 20 surrounded on the skin surface by the pressing ring 18.
A second injection device 25 having a valve gate for injecting the molten resin 24 serving as the base resin 17 is also provided.

The operation as described above will now be described. The operation of the moving mold 10 in the mold open state will now be described.
The skin 14 is set at a predetermined position on the mold cavity surface of
Suction is performed through the suction hole 15 so as not to cause displacement (FIG. 1). Next, the movable mold 10 is advanced to a predetermined position, and the cover 14 is
To form a space 20 of about 30 mm on the surface of the skin 14 (FIG. 2). Subsequently, the valve gate (not shown) of the first injection device 22 is opened, and the molten resin 21 is injected into the space 20 in a dumpling shape (FIG. 3).

After a predetermined amount of molten resin 21 is injected into the space 20 in the form of a dumpling, and the valve gate of the first injection device 22 is closed, the moving allowance of the movable mold 10 is reduced to about 3 to 4 mm. Then, the molten resin 21 in the space 20 is compressed, pushed and spread on the surface of the skin 14 as a molten resin 21a, and brought into close contact with the surface of the skin 14 (FIG. 4). Next, the molten resin 2 is supplied from the second injection device 25 to the mold cavity 23 outside the space 20 surrounded on the skin surface by the press ring 18.
4 is injected, and after closing the valve gate of the second injection device 25, the movable mold 10 is advanced to compress a compression allowance of about 3 to 4 mm, and to have not yet hardened and become a soft molten state. The molten resin 21a in a certain space 20 and the second
Of the molten resin 24 injected from the injection device 25 (A)
The pressing ring 18 that has pressed down the edge of the skin 14 is retracted from the surface of the skin 14 (FIG. 5).

Here, the molten resin 24 of the second injection device 25
After the injection, the example where the valve gate was closed was explained, but the invention is not limited to this. If compression is applied with the valve gate open,
The resin pressure is pressed between the inside of the cavity 23 and the injection device 25, and the resin in the cavity 23 is cured and contracted by cooling, so that the balance between the inside of the cavity 23 and the injection device 25 is obtained. There is also a method that does not give.

[0014]

As described above, the product is molded. The outer skin portion is pressed by the pressing ring with the press ring to press the outer skin over the entire length of the edge, and compression molding by the mold is performed around the outer skin surface. Since the resin part that becomes the base material of the product is molded by injection molding, the skin does not shift from a predetermined position and not only can not be scratched, but also the skin part surrounded by the holding ring is injection molded. No effect of high pressure. In addition, since the pressing ring is retracted from the surface of the skin while joining the resin surrounded by the pressing ring and the outside of the enclosure together with the compression, the bonding between the skin and the resin portion serving as the base material is improved, and there is no separation. In the above-described embodiment, an example in which the skin is set in the movable mold has been described. However, the present invention is not limited to this, and may be set in a fixed mold.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of the present invention, in which a skin is set on a movable mold.

FIG. 2 is a view showing one embodiment of the present invention, and is a view showing the next stage of FIG. 1 when the outer skin is surrounded by a pressing ring.

FIG. 3 is a view showing one embodiment of the present invention, in which molten resin is injected in a dumpling shape into a space surrounded by a press ring, which is the next stage of FIG.

FIG. 4 is a view showing one embodiment of the present invention, in which the next stage of FIG. 3 is a state in which a dumpling-like molten resin in a space surrounded by a press ring is spread on a skin and a predetermined compression allowance is left. FIG.

FIG. 5 is a view showing one embodiment of the present invention, in which molten resin as a base material is injected into a cavity outside a space surrounded by a press ring, which is the next stage of FIG. FIG.

FIG. 6 is a view showing an embodiment of the present invention, and is a view showing a product.

FIG. 7 is a view showing one embodiment of the present invention, and is a view showing a state in which a pressing ring presses an epidermis.

FIG. 8 is an explanatory view of a conventional molding method, showing a case where a skin is set on a female mold.

FIG. 9 is an explanatory view of a conventional molding method, showing a mold clamping state with a compression margin left.

FIG. 10 is an explanatory view of a conventional molding method, showing a state in which a molten resin serving as a base material is injected into a cavity in which a skin is set and compressed.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 moving die 11 moving die plate 12 fixed die plate 13 fixed die 14 skin 15 suction hole 16 product 17 base resin 18 press ring 19 cylinder 20 space portion 21 dumpling resin 22 first injection device 23 mold cavity 24 Molten resin 25 Second injection device

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[Procedure amendment]

[Submission date] January 20, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

Patent application title: Method for producing resin molded article having skin on part of its surface

Claims (2)

[Claims] 1. A skin is set on one side of both molds in a mold open state, and after the other mold is advanced to a predetermined position, the skin is fixed by a holding ring provided on the other mold side. While pressing over the entire length of the edge, a space is formed on the skin surface in cooperation with the other mold, and a molten resin is injected into the space by a first injection device in a dumpling manner. Part of the molten resin is compressed and spread over the skin surface, leaving a predetermined compression allowance, and then the molten resin is injected into the mold cavity outside the space surrounded by the pressing ring by the second injection device. A method for producing a resin molded body having a surface part of which is formed by injecting and further compressing the compression margin to compress the mold cavity and to retreat the pressing ring from the surface of the surface. 2. The mold according to claim 1, wherein the compression of the mold cavity after the injection of the molten resin by the second injection device is performed with the valve gate of the second injection device opened. A method for producing a resin molded body having a part of a used surface.