JP2747478B2 - Paintless film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paintless film for decorating the surface of a resin molded product without spray coating using an organic solvent and maintaining the performance of the resin molded product.

[0002]

2. Description of the Related Art Conventionally, an adhesive is used to bond a fluorine film and a cast film made of polyvinyl chloride with an adhesive.
There is known a laminated film (hereinafter, referred to as a first conventional example) in which the cast film and a polyvinyl chloride or polypropylene backing film are adhered to each other with an adhesive and laminated.

Further, a composite film made of fluorine and acrylic and a cast film of polyvinyl chloride are adhered with an adhesive, and an adhesive is used between the cast film and a backing film of polyvinyl chloride or polypropylene with an adhesive. A laminated film (hereinafter referred to as a second
A conventional example) is known.

[0004]

However, in the case of the first conventional example, the fluorine film is expensive. In addition, since the adhesive layer has two layers, the moldability is limited, and it cannot follow a molded product having a shape requiring an elongation of 50% or more. That is, when the shape of the molded product has a large difference in height, the laminated film breaks. Therefore, there is a problem that it can be used only for a relatively flat molded product.

In the case of the second conventional example, the cost is slightly lower because the composite film is made of fluorine and acrylic. However, since the adhesive layer has two layers as in the first conventional example,
There was a problem that the use was limited.

In the present invention, in view of these circumstances, an inexpensive acrylic film alone must be thin in order to improve moldability. Therefore, direct casting was not possible due to lack of strength. It is an object of the present invention to provide a paintless film in which the acrylic film is reinforced with polyester by extrusion coating laminating method and the adhesive layer is made one layer.

[0007]

In order to solve the above-mentioned problems, the present invention employs the following technical means. The invention according to claim 1 is based on an extrusion coating lamination method,
Anchor coating on a heat-resistant polyester film, extruding polyethylene through a T-die from an extruder, and then laminating an acrylic film on the composite film, forming a cast film of PVC, an adhesive, The technical means of laminating a vinyl chloride or polypropylene backing film was adopted.

The invention according to claim 2 is that the heat-resistant polyester film is anchor-coated by extrusion coating laminating method, polyethylene is extruded through a T-die by an extruder, and a composite film comprising fluorine and acrylic is further laminated thereon. The technical means of laminating the laminated film thus formed, an adhesive, and a polyvinyl chloride or polypropylene backing film was adopted.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is to make an acrylic composite film by an extrusion coating lamination method.
Anchor coating on a heat-resistant polyester film, extruding a polyethylene film through a T-die from an extruder, and further laminating an acrylic film on it, like a composite film formed from a top coat layer and a colored layer as a support layer Is molded first. The lower layer of the composite film is a paintless film in which a polypropylene film or polyvinyl chloride is bonded by an injection method or an extrusion method via an adhesive and laminated.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a schematic sectional view showing a first embodiment of the present invention, in which each film and adhesive are represented by lines. This first embodiment is based on an extrusion coating lamination method.
An anchor coat 2 (for example, 3 μ) is applied to a heat-resistant polyester film 1 (for example, 50 μ), and a polyethylene film 3 (for example, 40 μ) is extruded through a T-die from an extruder.
μ), and a polyvinyl chloride 5 (for example, 50 μ) is laminated.

The composite film 6 thus formed
Is to form a top coat layer and a colored layer as a support layer, and as a layer below it, an adhesive must be selected according to a molding method and a molding resin according to the application. As a method of construction, if the resin is polypropylene by injection molding, the polypropylene film 8 is laminated by dry lamination in a separate step. When the resin is polyvinyl chloride by the extrusion molding method, the polyvinyl chloride film 8 is laminated by dry lamination. By changing the adhesive layer (backing layer) as described above, it is possible to correspond to the molding method and the molding resin.

A configuration of a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic sectional view showing a second embodiment.
Each film and adhesive is represented by a line. This second
In the embodiment, the heat-resistant polyester film 1 (for example, 50 μ) is anchor-coated 2 (for example, 3 μ) by the extrusion coating lamination method, and the polyethylene film 3 is formed.
(For example, 40 μ) is extruded through a T-die from an extruder, and a laminated film 9 (for example, 50 μ) made of fluorine and acrylic is further laminated thereon.

The laminated composite film 10 thus formed has a top coat layer and a colored layer formed thereon as a support layer, and the lower layer is formed by using an adhesive by a molding method and a molding resin. Must be selected according to As a method of construction, if the resin is polypropylene by injection molding, the polypropylene film 8 is laminated by dry lamination in a separate step. When the resin is polyvinyl chloride by the extrusion molding method, the polyvinyl chloride film 8 is laminated by dry lamination. By changing the adhesive layer (backing layer) as described above, it is possible to correspond to the molding method and the molding resin.

The second embodiment is more functionally superior in chemical resistance than the first embodiment. Next, the method of forming a paintless film will be described.

(A) Insert injection molding In order to use this method, two steps are required.
First, the film is pre-vacuum formed and trim cut to form the surface of the product. Second, the formed film is mounted in a mold. When injection molding is performed in this state, the molding resin is fused to the backing sheet, and the surface of the product is covered with the paintless film.

(B) In-mold molding (in-mold molding) Unlike insert injection, this method does not vacuum-mold the film in advance. In this method, the film supplied in the form of a roll is fed between molds, set on the front side of the product, the mold is closed, and injection molding is performed. As the mold fills, the pressure and temperature of the molding resin turns the film into a product state. When the mold is opened, the part is finished with the film adhered to the molded product. As with insert injection, trim cutting equipment is required.

(C) Extrusion (extrusion) This is a method in which a thermoplastic resin is melted in a heating cylinder and extruded with a screw to continuously produce various shapes having different diameters. The paintless film is slit into a width corresponding to the shape of the product in advance, and is fused in the extrusion die or at the exit of the die using the heat of the resin. This method
Since it can be formed continuously, the cost is reduced. However, it is necessary to cut to the required dimensions, and since the cut cross section cannot be a product, the end needs to be formed. One method is a molding method using hot pressing.
Also, after both terminals have been hot-pressed, it is necessary to trim them.

(D) Injection blow molding (blow molding) This is a method for molding a hollow molded product. Reduce material weight,
Also, since it is a molding method that also reduces costs, it is being studied for automobile side moldings.

[0019]

According to the present invention, the following effects can be obtained based on the above configuration.

(1) The environmental advantage is that, first, molding can be performed without using a coating agent. Second, the yield of solvent in the process of producing a paintless film is 99.9%, and the amount released into the atmosphere is very small. Thirdly, it can be recycled and the resin used is thermoplastic, so it can be recycled directly to the molding process. Even if a grind product is mixed up to 40% of the whole, the performance and appearance of the molded product are not deteriorated. Such recycling is not possible with spray-painted products.

(2) The advantage in manufacturing and molding is that, first, no painting equipment is required. Lower capital investment. Molded articles can be supplied without operating costs. Secondly, it can be formed by using a paintless film on an inexpensive resin.
In the case of spray coating, expensive resin is used because of poor adhesion to the paint. Further, there is an advantage that a resin which is weak to a solvent or a resin having a low heat distortion temperature can be used.

(3) The merit of appearance is that the chipping property is stronger than spray coating. The thickness of the top coat layer of the spray coating is about 10 μm, and the thickness of the paintless film is 50 μm. Even in other weather resistance and chemical resistance, the performance is not inferior because there is a layer five times thicker than that.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a paintless film according to a first embodiment of the present invention.

FIG. 2 is a schematic plan view showing a paintless film according to a second embodiment of the present invention.

[Explanation of symbols]

1 Heat-resistant polyester film 2 Anchor coat 3 Polyethylene film 4 Acrylic film 5 PVC 6 Composite film 7 Adhesive 8 Polypropylene film or PVC film 9 << Laminated film 10 >> Laminated composite film

Claims (2)

(57) [Claims] 1. An extrusion coating lamination method,
Anchor coating on a heat-resistant polyester film, extruding polyethylene through a T-die from an extruder, and then laminating an acrylic film on the composite film, forming a cast film of PVC, an adhesive, A paintless film characterized by laminating a backing film of vinyl chloride or polypropylene. 2. A laminated film formed by anchor coating a heat-resistant polyester film by extrusion coating laminating method, extruding polyethylene through a T-die by an extruder, and further laminating a composite film comprising fluorine and acrylic thereon. A paintless film comprising an adhesive, an adhesive, and a polyvinyl chloride or polypropylene backing film laminated.