JPS62128727A - Manufacture of molding - Google Patents

Abstract

PURPOSE:To prevent the deformation of a molded product and generation of darkness due to a solbent such as kerosene or the like by a method wherein an urethane series resin film is transferred on olefin series resin molded product by a protection film and the film is molded by extrusion. CONSTITUTION:A protection film 1, having resistance to heat and elasticity, is supplied to a line and urethane series resin 8 is coated thereon to form an urethane series resin film 9 and is baked in a baking furnace 4, thereafter, is supplied to an extrusion molding mold 5. On the other hand, a decorative film 2 is supplied to the extrusion molding machine 5 and olefin series resin 11 is supplied from an extruding machine 10 to effect extrusion molding. In this case, the outer surface of a molded product is coated by a protection film 1 so that the urethane series resin film 9 is contacted with the olefin series resin 11 and the extrusion molding is effected so that the decorative film 2 is embedded into the inside of the olefin series resin 11. The urethane series resin film 9 is transferred on the surface of the molded product 6, therefore, darkness due to a solvent such as kerosene or the like and a deformation in the case of the extrusion molding will never be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a synthetic resin molding for a vehicle.

[Conventional technology]

Olefin resins such as ionomer resins have high cold impact resistance, so they are used as moldings around automobile bumpers and windows. The traditional manufacturing method for this type of molding is.

Molten resin is supplied to an extrusion mold to perform extrusion molding, the extrusion molded product is cut into predetermined dimensions, and an end piece is formed at the end, or a molding is performed without forming an end piece.

[Problem that the invention seeks to solve]

However, in moldings manufactured by such conventional methods, the olefin resin is exposed on the surface, so when the car is shipped, it is coated with a rust preventive agent, and before it is delivered to the user, it is sprayed with a solvent such as kerosene. When removed, the surface of the molding becomes cloudy and loses its luster. In addition, during extrusion molding, the molded product becomes starch syrup-like and tends to sag at the exit of the extrusion mold, making it difficult to maintain the shape.

This invention is intended to solve the above-mentioned problems, and aims to provide a method for manufacturing a molding that does not become cloudy due to solvents such as kerosene and does not undergo deformation during extrusion molding.

[Means for solving problems]

This invention provides a method for extruding a molding by supplying a molten olefin resin to an extrusion mold, in which a protective film having heat resistance and elasticity formed with a urethane resin coating is supplied to the extrusion mold, This method of manufacturing a molding is characterized in that extrusion molding is performed with the urethane resin coating in pressure contact with the molded product, and the urethane resin coating is transferred to the molded product.

As the olefin resin, ethylene resins such as ionomer resins (ethylene-acrylic acid copolymer resins) are preferred. As the urethane resin, polyurethane resin etc. can be used, preferably a transparent one and a material that is not compatible with the urethane resin. For example, a film of polytetrafluoroethylene resin (Teflon), polyacetal resin, etc. is used. It is possible.

[For production]

In the molding manufacturing method of the present invention, a protective film having a urethane resin coating and a molten olefin resin are supplied to an extrusion mold, and the molten resin is protected so that the urethane resin coating is in contact with the molten resin. When extrusion molding is performed while covered with a film, the protective film with a urethane resin coating is heated by the heat of the molten resin, and is extruded while being pressed against the surface side of the molded product by the pressure of the molten resin. The resin film is transferred to the surface of the molded product, and the protective film covers the molded product to prevent deformation such as sagging before exiting the extrusion mold.

A molding is manufactured by cutting the molded product thus extruded into a predetermined size. The manufactured molding is prevented from deforming during extrusion molding, has a predetermined shape, and is coated with a urethane resin coating, so it does not become cloudy even when treated with a solvent such as kerosene.

〔Example〕

Hereinafter, the present invention will be explained with reference to embodiments of the drawings.

Figure 1 is a system diagram showing the manufacturing method of the example, Figure 2 (A)
-(D) are sectional views taken along A-A-D-D, and FIG. 3 is a perspective view of the manufactured bumper molding. In the figure, 1 is a protective film, 2 is a decorative film, 3 is a roll coater, 4 is a baking furnace, 5 is an extrusion mold, 6 is a molded product, and 7
is a molding.

The manufacturing method for the molding begins with polytetrafluoroethylene resin (Teflon) having the shape shown in Figure 2 (A);
A protective film 1 having heat resistance and elasticity made of a resin incompatible with urethane resin such as polyacetal resin is supplied to the line, and a urethane resin 8 is applied by a roll coater 3.

As shown in FIG. 2(B), a urethane resin coating 9 is formed on the protective film 1, baked in a baking oven 4, and then supplied to an extrusion mold 5.

On the other hand, a decorative film 2 such as a colored synthetic resin film or a metal-deposited synthetic resin film having the shape shown in FIG. Extrusion molding is performed by supplying resin). At this time, as shown in FIG. 2(D), the outer surface of the molded product 6 is covered with the protective film 1 so that the urethane resin film 9 is in contact with the olefin resin 11, and the decorative film 2 is covered with the olefin resin 11. It will be buried inside.

When extrusion molding is performed in this way, the protective film 1 on which the urethane resin coating 9 is formed is heated by the heat of the molten resin, and is extruded while being pressed against the surface side of the molded product 6 by the pressure of the molten resin. The coating 9 is transferred to the surface of the molded article 6. In addition, the protective film 1 covers the outer surface of the molded product 6,
Its elasticity prevents deformation such as sagging of the molded product 6, and leaves the molded product 6 out of the extrusion mold 5 while maintaining the molded product 6 in a predetermined shape.

The molded product 6 that has come out of the extrusion mold 5 is cut into a predetermined size by a cutting machine 12 to form a molding 7.

If necessary, the protective film 1 is peeled off and attached to the vehicle body, as shown in FIG. 3, but the protective film 1 may be peeled off after transportation and assembly.

The molding 7 manufactured in this way is covered with the protective film 1 and extrusion molded, so that it is manufactured in a predetermined shape. Furthermore, since the urethane resin coating 9 is transferred to the outer surface, fogging does not occur even when treated with a solvent such as kerosene. In the above embodiment, the urethane resin coating 9 and the olefin resin 11 are transparent, and the decorative film 2
can be seen through from the outer surface side, and the molded product 6
Since the outer surface of the decorative film 2 is uniform, the decorative film 2 is uniformly visible and has an excellent appearance.

If the urethane resin coating 9 and the olefin resin 11 are opaque, the decorative film 2 may be omitted, but a core material may be embedded instead.If a protective film 1 with a smooth surface is used, The transferred film 9 becomes smooth and has a glossy surface, whereas if the protective film 1 with a roughened surface is used, a matte surface can be obtained.

Ethylene-acrylic acid copolymer resin FAA (A-201K) (manufactured by Mitsubishi Yuka, trade name) was used as the olefin resin 11, and urethane clear (Nippon B Chemical KK), a polyurethane resin, was used as the urethane resin 8.
For the molding 7 manufactured as shown in Figs. 1 to 3 using the product manufactured by the company, product name), high temperature kerosene at 75°C was sprayed for 7 seconds from a distance of 0.5 cm, and the haze value (HAZE value) was measured before and after spraying. ) are shown in Table 1.

Table 1 In Table 1, the higher the value, the greater the degree of haze, and it can be seen that the degree of haze becomes zero with the treatment compared to the case without treatment.

FIG. 4 is a sectional view showing a window molding manufactured in accordance with another embodiment, which is manufactured in substantially the same manner as in the previous embodiment and produces similar effects.

In the above embodiments, a protective film is used on the production line.

A urethane resin coating 9 was formed on the ilm 1.

A protective film on which a coating 9 is separately formed may also be used.

Further, the present invention is applicable not only to bumper moldings and window moldings, but also to the manufacture of other moldings.

[Effects of the Invention] According to the present invention, since the urethane resin coating is transferred to the olefin resin molded product using a protective film and extrusion molded, deformation can be prevented and the product can be molded into a normal shape. The molded product has a uniform surface and has the advantage of not becoming cloudy due to solvents such as kerosene.

[Brief explanation of drawings]

Figure 1 is a system diagram showing the manufacturing method of the example, Figure 2 (A)
-(D) are sectional views taken along the line A-A-D-D, FIG. 3 is a perspective view of the manufactured molding, and FIG. 4 is a sectional view of the molding manufactured in another example. In each figure, the same reference numerals indicate the same or corresponding parts. 1 is a protective film, 2 is a decorative film, 3 is a roll coater, 5 is an extrusion mold, 6 is a molded product, 7 is a molding, 9 is a urethane resin coating, and 11 is an olefin resin.

Claims (4)

[Claims] (1) In a method of extruding a molding by supplying a molten olefin resin to an extrusion mold, a heat-resistant and elastic protective film coated with a urethane resin is supplied to the extrusion mold, and the urethane resin is A method for manufacturing a molding, which comprises performing extrusion molding with the urethane-based resin film in pressure contact with the molded product, and transferring the urethane-based resin film to the molded product. (2) The manufacturing method according to claim 1, wherein the olefin resin is an ethylene resin. (3) The manufacturing method according to claim 1 or 2, wherein the protective film is incompatible with the urethane resin. (4) Claims 1 to 3 in which a decorative film or core material is embedded inside the molded product during extrusion molding.
The manufacturing method described in any of paragraphs.