JPH09141682A - Mold for molding integrated skin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of creases caused by an air entrainment in a molded article having a recess or inverted R-shape at the time of integrally molding an article with a skin material spread thereover by a stamping molding operation. SOLUTION: The skin integral type mold for manufacturing a molded item having a skin material H formed is such that opposite first and second molds 10, 20 define a cavity, and a skin material H is spread between the opposite molds 10, 20, and then molten resin is injected and then clamped therein, wherein at the outside position of the cavity to which the molten resin comes finally, a recess or cutting communicating with the cavity and outside is formed at either mold side of a mold 10 or a mold 20. Then, at the bottom surface of the recess or cutting, a spacer is disposed which has a smaller area than the bottom surface, and the spacer is fixed by an air release piece 23 located on a parting line PL in its one surface, and further an interstice is defined between the spacer and molds 10, 20 so as to enable air to be discharged from the interstice.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skin integral molding die, and more particularly to a skin integral molding die used when a product provided with a skin material is integrally molded by stamping molding.

[0002]

2. Description of the Related Art Generally, for interior parts of automobiles, a molded product with a skin is widely used in which various skin materials are laminated on the surface of a base material made of a thermoplastic resin or the like in order to give a high-grade feeling. In order to manufacture this molded product with a skin, a mold for integral skin molding is used, and this mold for integral skin molding has a skin material arranged between two molds, and a resin is formed together with mold clamping. Is being supplied for molding.

A vehicle seat is known as an interior component constructed by disposing a skin material on a base material. That is, FIG. 5 is an explanatory perspective view showing a backrest of a seat S of a conventional example. In FIG. 5, a cushion material is disposed on the front side of the backrest Sb of the seat S, and the back side of the cushion material (that is, the seat). The back board is disposed on the back surface of the. The cushion material and the backboard are covered with the seat surface material H. In FIG. 4, the symbol P is a pocket portion.

[0004]

[Problems to be Solved by the Invention]
A recess or an inverted R shape is formed, and at the place where the molten resin is rolled at the end during molding, the air between the skin material and the cavity mold at the time of molding cannot be completely exhausted, and air accumulation wrinkles occur in the product. There is an inconvenience that it will occur.
This air accumulation wrinkle is remarkable especially when the skin material has poor air permeability.

The occurrence of such wrinkles deteriorates the commercial property, and a skin-integrated molding die capable of forming a product free from wrinkles due to air accumulation in a molded product having a recess or an inverted R shape is desired. ing.

An object of the present invention is to integrally mold a skin in which a product having a skin material is integrally molded by stamping molding without forming a wrinkle due to air accumulation in a recessed or inverted R shaped product. To provide the mold.

[0007]

A mold for integral molding of skin according to the present invention has a cavity formed by first and second molds facing each other, and a skin material is disposed between the molds facing each other. In addition, in a mold for skin-integrated molding that manufactures a molded product formed by injecting molten resin and clamping the mold to form a skin material, the molten resin communicates with the cavity and the outside at a position outside the cavity where the molten resin finally reaches. A recess or notch is formed on one of the mold sides, and a spacer having an area smaller than that of the bottom surface is provided on the bottom surface of the recess or notch so that one surface is on the parting line. The spacer is fixed by an air bleeding piece arranged at 1, a gap is formed between the spacer and the mold, and air can be removed from the gap. The plate thickness of the spacer is preferably 0.03 mm to 0.05 mm.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A skin-integrated molded product of the present invention is one in which a skin material H is integrally molded on a base material 40 made of a resin, and a joint portion between the base material 40 and the skin material H is A recess, an inverted R shape, etc. are formed. And the first mold 1
With 0 as the core mold and the second mold 20 as the cavity mold, a cavity K having a predetermined shape is formed by these molds 10 and 20. A skin material is arranged between the molds 10 and 20, a resin is injected into the cavity K, and the mold is clamped to form a skin-integrated molded product.

Then, a cutout 21 communicating with the cavity K and the outside is formed in the die 20 which is one of the dies at a position outside the cavity K where the molten resin (which will serve as the base material 40) finally reaches. A spacer 22 having an area smaller than that of the bottom surface 21a is provided on the bottom surface 21a of the notch 21.
At this time, the spacer 22 is fixed by the air bleeding piece 23 whose one surface is arranged on the parting line PL.

That is, the spacer 22 is fixed by the air vent piece 23 on the parting line PL, and the spacer 22
A gap is formed between the mold and the mold 20, and air is excluded from this gap.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIGS. 1 to 4 show an embodiment of a mold for integrally forming a skin according to the present invention. FIG. 1 is a schematic sectional view,
FIG. 2 is a schematic perspective view of FIG. 1, FIG. 3 is a partially exploded view for explaining the assembling of the spacer, and FIG.

The skin-integrated molded product of this example is one in which a skin material is integrally molded on a base material made of resin, and the place where the reverse R (or recess) is is the corner of the back shoulder of the backrest. This part will be explained as a part where the molten resin reaches the end. The skin-integrated molded article of this example has a base material portion 41 of the base material 40 portion on which the skin material H is arranged, and a base material portion 42 on which the skin material H is not arranged.

As shown in FIG. 1, the skin integral molding die of the present example has a first die 10 and a second die 20 as main constituent elements, and the first die 10 and Second mold 20
And are opposed to each other. In this example, the first mold 1
0 is the fixed side mold, and the second mold 20 is the movable side mold. Then, using the first mold 10 as the core mold, the second mold
The mold 20 of FIG.
0 forms a cavity K having a predetermined shape.

In the first mold 10 of this embodiment, a passage for the molten synthetic resin to be the base material 40 is formed at a predetermined position, and the molten synthetic resin is injected into the cavity K from the valve gate through this passage.

In this example, as shown in FIG.
A positioning block 11 is provided at a predetermined position of the mold 10 of the first mold 10 so that the first mold 10 is replaced by the second mold 20.
When it goes into too much, this positioning block 11
The shape of the cavity K formed by the first mold 10 and the second mold 20 is secured by contacting with an air bleeding piece described later. The positioning block 11 has a needle 25 to be described later.
A protruding space 11a is formed.

Further, in this example, after the pressure die is clamped by the first die 10 and the second die 20, cooling and the like can be performed. Known techniques can be used for the device for injecting the molten synthetic resin, the device for clamping the mold and the like.

The second mold 20 of this embodiment is a concave mold (cavity mold), and the air vent of this embodiment is a notch 21 as a recess formed in the mold 20 and a spacer 22.
And the air bleeding piece 23 are the main constituent elements.

The recess of this example is a notch 21,
The molten resin is formed at the outermost position of the cavity K where it reaches the end, that is, at the corner of the second mold 20 in this example, as shown in FIGS. That is, the concave portion (notch 21) has a bottom surface 21.
It communicates with the cavity K side at a position a. A predetermined number (two in this example) of screw holes 21b for set screws are formed on the bottom surface 21a of the notch (recess) 21. Further, a needle 25 as a holder for the skin material H is provided upright on the outer periphery of the cavity K other than the notch 21.

The spacer 22 of this example is composed of the above-mentioned cavity K.
The cutout (recess) 21 formed outside has a plate body having a smaller area than the bottom surface 21a of the cutout 21, and has a similar shape to the bottom surface 21a of the cutout 21 and a slightly smaller shape. The plate thickness of the spacer 22 of this example is 0.
It has a thickness of 03 mm to 0.05 mm. A mounting hole 22a is formed in this spacer 22,
The mounting hole 22a is formed at a position aligned with the screw hole 21b.

The air bleeding piece 23 of this example has substantially the same shape as the above-mentioned cutout (recess) 21. The surface of the air bleeding piece 23 on the die 20 side is arranged on the parting line PL. And this air removal piece 2
3, a mounting hole 23a is formed. The mounting hole 23a is configured to be aligned with the mounting hole 22a of the spacer 22 and the screw hole 21b of the notch (recess) 21.

As shown in FIG. 3, the spacer 22 and the mounting piece 23 are arranged on the bottom surface 21a of the notch (recess) 21, and the set screw 24 is mounted by the mounting holes 23a and 22a and the screw hole 21b. Is fixed with the air bleeding piece 23.

In this way, the spacer 22 smaller than the notch 21 of the mold 20 is provided with the air vent piece 23 and the bottom surface 2 of the notch.
A space can be formed between the spacer 22 and the mold 20 by disposing it between the spacer 22 and the die 20. Air can be removed from this gap to prevent wrinkles and the like due to the accumulation of air. Further, since the end surface side of the air bleeding piece 23 (that is, the mold 10 side) is arranged on the parting line PL, there is no influence on the molded product. Further, the gap formed between the spacer 22 and the cut bottom surface 21a is 0.0
Since the gap is 3 mm to 0.05 mm, air can be removed, but the appearance of the molded product is not affected.

In the above-mentioned embodiment, the spacer 22 having the same shape as the bottom surface 21a of the notch 21 and a slightly smaller similar shape is used.
The spacer may have a shape other than the similar shape, and can form a gap of 0.03 mm to 0.05 mm between the air vent piece 23 and the bottom surface 21a of the cut 21. However, it may be constituted by a washer or the like.

Further, in this example, the notch 21 is shown as the concave portion, but it may be a literal concave portion communicating with the outside (for example, the atmosphere).

The resin used as the base material in the present invention, that is, the molten synthetic resin to be injected is, for example, polypropylene, polyethylene, polystyrene, acrylonitrile-styrene-butadiene copolymer, thermoplastic resin such as nylon, ethylene-propylene. Any of thermoplastic elastomers such as block copolymers and styrene-butadiene block copolymers that are commonly used for compression molding, injection molding and extrusion molding can be used. In addition, those containing additives such as inorganic fillers, fillers such as glass fibers, pigments, lubricants, and antistatic agents can also be appropriately used.

As the material of the skin material H used in the present invention, thermoplastic resin such as polyolefin, vinyl chloride and nylon, and thermoplastic elastomer sheet such as polyolefin, polyester, urethane and vinyl chloride are used. Is mentioned. Further, the above-mentioned materials may be used alone or a laminate of two or more of them may be used as the skin material H.

To give a softer feel, the skin material H
With a foamed sheet of polypropylene, polyethylene, urethane, etc. attached to the back side of the cloth, or a cloth or sheet for the purpose of protecting it from the heat of the molten synthetic resin during molding and strengthening the adhesive force between the skin material H and the core material layer It is also possible to use a laminate in which the above and the like are attached to the back surface. In using these skin materials H, preheating may be performed prior to the supply in order to adjust the tensile stress and elongation of the skin material H.

The integral molding of the backboard of the seat S having a pocket portion on the back surface and the skin material by the mold of this example will be described. Generally, a cushion material is provided on the front side of the backrest of the seat. The backboard is disposed on the back side of the cushion material (that is, the back side of the seat). The backboard and seat skin are integrally molded.

In the case of such a molded product, the resin in the right and left corners of the backrest finally turns during molding, so that the air in the cavity K remains to the end.
Since the air accumulation in this portion is eliminated, the molded product can be molded without wrinkles due to the air accumulation. Although the seat has been described as an example in the above embodiment, the mold according to the present invention is also suitable for an interior material (for example, a door) which is a molded product in which a recess, an inverted R shape or the like is formed.

[0031]

As described above, according to the mold for integral molding of skin according to the present invention, when a product in which a skin material is partially disposed is integrally molded by stamping molding, the end portion of the molded product, etc. It is possible to prevent the generation of wrinkles due to the accumulation of air in the last place where the resin of FIG.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a mold for integrally forming a skin according to the present invention.

FIG. 2 is a schematic perspective view of FIG.

FIG. 3 is a partial exploded view for explaining the assembly of spacers.

FIG. 4 is a cross-sectional explanatory view of a main part at the time of mold clamping.

FIG. 5 is an explanatory perspective view showing an example of a product.

[Explanation of symbols]

 10 1st metal mold 11 Positioning block 11a Projection space 20 2nd metal mold 21 Notch (concave part) 21a Bottom face 22 Spacer 21b Screw hole 23 Air vent piece 23a, 22a Attachment hole 24 Set screw 25 Needle H Skin material K Cavity PL parting line

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29C 45/14 9543-4F B29C 45/14 // B29L 31:58

Claims (2)

[Claims] 1. A skin material is formed by forming cavities with opposed first and second molds, arranging a skin material between the molds facing each other, and injecting molten resin and clamping the mold. In a mold for integrally molding a skin to produce a molded product formed by: forming a concave portion or a notch communicating with the cavity and the outside at a position outside the cavity where the molten resin reaches last, one of the molds A spacer having a smaller area than the bottom surface is formed on the bottom surface of the recess or cutout, and the spacer is fixed by an air bleeding piece having one surface located on the parting line. A mold for integral skin molding, wherein a gap is formed between the mold and air so that air can be removed from the gap. 2. The mold for integral skin molding according to claim 1, wherein the spacer has a plate thickness of 0.03 mm to 0.05 mm.