JPS61112615A - Manufacture of molded product with skin - Google Patents

Abstract

PURPOSE:To contrive to mold like suede a product with soft touch and warm feeling by polishing the surface of a foamed vinyl chloride film which is cured and integrally molded, while pouring the raw liquid of polyurethane foam. CONSTITUTION:A mold 3 is heated to the temperature where the skin material to be thrown into is partially molten and adheres to the mold surface. The gelation of the material 7 begins, and at the temperature where the surface has adhesive property, the material 7 is kept in the mold for giving a specified thickness. After the finishing of the specified thickness, a semimolten thin film is completely molten, and the mold is heated to a specified temperature for promoting foaming suction. The mold 3 is cooled, and the film member 8 adhering to the mold surface is released from the mold. The film member 8 is set on the bottom force of a mold 9, and the raw liquid of semicuring or curing polyurethane form is poured thereinto, and then a top force 11 is clamped and fixed onto a bottom force 10. When foam molding is completed, the molded product with the film is removed from the mold 9, and then the surface layer of foamed vinylchloride is polished. Thus it is made like suede.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a molded product with a skin, and more specifically, a method for manufacturing a molded product with a skin having a suede-like surface condition, such as an interior part for an automobile. There are crush pads, door trims, and console boxes.

The present invention relates to a method of manufacturing a glove box lid, etc.

(Prior Art) Skinned molded products conventionally used for automobile interior parts have a thin granite-like skin made of polyvinyl chloride on their surfaces. These skins are used primarily to play a decorative role in the interior of a car and to improve comfort when coming into contact with passengers.Therefore, it is essential that they have appropriate strength against friction and impact. there were. However, today's skin materials have diversified user preferences, and when used in products that come into direct contact with the user's body, it is not only necessary to satisfy the mechanical properties mentioned above, but also to meet the user's skin texture. It has also become necessary to pay attention.

For example, polyvinyl chloride skin formed by conventional rotational molding, blow molding, vacuum forming, etc., accumulates heat and softens when exposed to high temperatures, causing discomfort such as a hot or sticky feeling when it comes in contact with the user's skin. or, when it is cold, it hardens and cools, giving the user an unpleasant cold sensation.

Therefore, these epidermal bodies form a synthetic leather-like surface layer with skin patterns etc. to reduce the unpleasant sensations of heat, cold, and sensation mentioned above. This had the drawback of irritating the driver's eyes, and also reflecting the image on the 70-light glass, obstructing the driver's view.

Therefore, attempts have been made to flock the surface of the skin body or to bond the cloth itself with gold, but these methods are both extremely expensive and difficult to mold, so they are generally not used today. is not in use.

(Problems to be Solved by the Invention) The present invention addresses the above-mentioned circumstances and improves the above-mentioned gap, and in particular improves the molding method to provide a soft feel and a warm taste. The object of the present invention is to provide an economical method for manufacturing a molded article having a suede-like skin and reducing the amount of materials used.

(Means for Solving the Problems) Therefore, the feature of the present invention for achieving all of the above objects is that a skin material made by mixing a foaming agent into vinyl chloride plastisol or powder material is heated completely. After filling the skin mold, unnecessary skin material is discharged and the skin material adhering to the skin mold is heated and cured to form a foamed skin body.

Next, the foamed vinyl chloride skin body removed from the mold is placed in a urethane foam mold, and a semi-rigid or rigid polyurethane foam stock solution is injected and cured to integrate the two,
This is a method for producing a molded article with a skin body, in which the surface of the foamed vinyl chloride skin body of such an integrally molded article is polished.

(Example) Hereinafter, specific embodiments of the method of the present invention will be described with reference to the accompanying drawings.

Figures 1 to 3 are cross-sectional views showing one example of the method of the present invention at each step. In the figures, (1) shows a skin mold consisting of a slush mold, and the opening (2) 'I
It is constructed by installing a mold (3) with t on a mold support member (4), and the outside of the mold (3) has 5 to 1
The iron jacket (5) is tJE at all intervals of 5 mm.
FiM is here. The space (6) formed by the mold (3) and jacket (5) forms a space into which heat medium oil such as heavy allylbenzene oil flows to heat and cool the mold (3). There is. Heat transfer oil is usually /
210-270℃ for J11 heat system, 20-50℃ for cooling system
It has two systems: the heating system during heating, and the cooling system during cooling, which flows into the space between the entire jacket (5) and the mold (3) to adjust the temperature of the mold (3). The temperature adjustment of the mold is not limited to the above-mentioned heat medium oil, but other methods such as high-frequency induction heating, spraying combustion heat of propane gas, kerosene, etc. may also be adopted, and when cooling, water is sprayed. You may.

Furthermore, the mold (3) used in the method of the present invention has a thickness of 2.5~
50-fin nickel electroforming molds, copper electroforming molds, aluminum precision casting molds, and metal spraying molds can also be used.

Next, the foamed vinyl chloride plastisol or vinyl chloride powder skin material (
7), and the skin material is specifically vinyl chloride material and plasticizer.

Plastisol mixed with stabilizers, lubricants, foaming agents, etc.
Plasticizer, stabilizer, lubricant, 5 blowing agents are all kneaded and absorbed into vinyl chloride resin with a gorgeous particle shape. Particle size is 50 to 150.
μ powder compound.

In addition, it is a powder compound obtained by kneading vinyl chloride resin with plasticizer, stabilizer, lubricant, blowing agent, etc., gelling it, cooling it, and pulverizing it by a pulverization method, etc. The above blowing agent is A +
D, O, A (Azodicarbonamide
).

D, P, T (Di-nitrosopenta
met, hyienel; 6tram1ae) urea compounds, etc., and the amount added is 1 to 10 parts by weight, preferably 15 to 10 parts by weight, per 100 parts by weight of vinyl chloride resin.
5 parts by weight.

The above-mentioned skin material is not limited to plastisols or powder materials of the same type or color, but may be a mixture of a plurality of plastisols or powder materials of different colors or particle sizes, for example, 2 to 5 types. For example, to mix all the different colored materials, it is necessary to mix 80% by weight of blue, 10% by weight of white, and 10% by weight of red, and this makes it possible to create an even more suede feel.

When the skin material is introduced, the mold 3) is heated or preheated to a predetermined temperature. Specifically, a high-temperature heating oil is heated in the space inside the mold 3 and the jacket (5). The skin material flowing into the mold (3) is raised to a temperature at which the entire surface material is partially melted and adheres to the surface of the mold.

That is, the temperature at which the skin material begins to gel, and the powder material begins to gel, and the powder surface becomes sticky, is usually 120°C.
The skin material (7) is kept in the mold for 2 to 15 seconds to increase the thickness of the skin material.

After the above-mentioned thickening is completed, the unnecessary part of the skin material (7) is completely discharged, but at this time a semi-molten thin film is formed on the mold surface.
It's attached. Therefore, in order to completely melt the semi-molten thin film and promote the foaming reaction, the mold temperature is raised to about j00 for all layers. (See Figure 2) After the above, the heating system's heating medium oil is substituted into the space (6) between the mold (3) and the jacket (5) for 20 to 50 minutes.
Pour cooling system heat medium oil at ℃ and mold (3) total 70-100
Cool to ℃. After cooling, the skin body (8) adhering to the inner surface of the mold, whose thickness was adjusted in the order of 0.5 mm to 5.0 mm, is completely removed from the mold. Thereafter, the skin (8) is placed in the lower mold α0) of the foam molding mold (9), and when the lower mold (10) is set at about 80 to 50°C, it becomes semi-hard or hard. The polyurethane foam stock solution is injected into the upper mold (U).
is tightened and fixed to the lower mold α0). (See FIG. 3) When the foam molding of the polyurethane foam is completed in this way, the molded product with the skin is removed from the foam mold (9).

When the polyurethane foam layer of the skinned molded product obtained by the above foam molding is hard, it can be used as an insert in automobile interior parts such as instrument panel butts or console boxes, and it is also lightweight. Connect. However, the surface of the foamed vinyl chloride skin body forms an extremely thin skin layer, and in this state, it is no different from the surface layer of conventional vinyl chloride, causing the user to experience unpleasant sensations of heat or cold or direct exposure to the skin. The surface of the vehicle reflects sunlight and irritates the driver's eyes.

In the method of the present invention, the next step is to polish the surface of the foamed vinyl chloride of the molded article using a metal sanding jig.

The surface layer obtained in this way has a surface state with extremely small irregularities as the closed cell pores of the PVC foam layer are destroyed, and is formed into a suede-like texture with a soft touch and warmth. Since the cells are closed cells, the liquid material has a characteristic that it is difficult to seep into the layer, and this A' can be achieved by extremely simple means.

As shown in FIGS. 4 and 5, the molded article with a skin obtained by the method of the present invention includes a foam skin layer (8) of vinyl chloride and a rigid polyurethane foam (8).
It is formed from two layers of rigid polyurethane foam (b).
12) is used as an insert (see Figure 4, foamed vinyl chloride skin layer (8), semi-rigid polyurethane foam α3), and when it consists of a grease-resistant insert 0 (see Figure 5). ).

(Effects of the Invention) As described above, the method of the present invention enables foam molding by attaching skin material to a skin molding mold to a uniform thickness, and also prevents material loss because unnecessary skin material can be recovered. This not only saves materials, but also allows the formation of a polyurethane foam layer firmly bonded to the surface of the foamed vinyl chloride.Furthermore, by polishing the entire surface of the foamed layer of vinyl chloride, it is possible to By completely destroying the air bubbles and making the surface rough, it is possible to create a suede-like texture with a soft touch and warmth, which gives a warm sensation to the user.

It has various effects, such as eliminating the cold sensation, and since the inside of the skin layer has closed cells, it can prevent liquid substances from seeping in.

[Brief explanation of drawings]

FIGS. 1 to 3 are cross-sectional views illustrating a process according to an example of the method of the present invention, and FIGS. 4 and 5 are cross-sectional drawings of a molded product obtained by the same method. (1)...Skin mold, (3)...Mold. (7) Epidermal material, (8) Epidermal body. t9)...Mold for foam molding. Rod 2 days!

Claims (1)

[Claims] 1. A skin material made of vinyl chloride plastisol or a powder material mixed with a foaming agent is charged into a heated skin mold and filled, and then unnecessary skin material is discharged and the skin mold is replaced. The skin material adhered to the foam is cured by heating, and then removed from the skin mold, and the demolded foamed vinyl chloride skin is placed in a foam mold, and a semi-rigid or rigid polyurethane foam stock solution is injected and cured. A method for manufacturing a molded product with a skin, which comprises integrating the two, and then polishing the surface of the foamed vinyl chloride skin of the integrally molded product. 2. The method for producing a molded article with a skin according to claim 1, wherein the skin material is a mixture of a plurality of powder materials of different colors and/or different particle sizes mixed with a foaming agent.