JP2747478C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention decorates the surface of a resin molded product without using spray coating using an organic solvent, and improves the performance of the resin molded product. The present invention relates to a paintless film to be held. Conventionally, a fluorine film and a cast film made of polyvinyl chloride are bonded with an adhesive, and the cast film is bonded with a backing film of polyvinyl chloride or polypropylene. Adhesive film, and laminated film (
Hereinafter, a first conventional example) is known. [0003] Furthermore, a composite film composed of fluorine and acrylic is bonded to a cast film made of polyvinyl chloride with an adhesive, and an adhesive is used between the cast film and a backing film made of polyvinyl chloride or polypropylene. A laminated film that is bonded and laminated (hereinafter referred to as a second 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. [0005] Also, in the case of the second conventional example, the cost is slightly lower because the composite film is made of fluorine and acrylic. However, as in the first conventional example, the adhesive layer has two layers. Had a problem with its limitations. In view of these circumstances, the present invention requires that an inexpensive acrylic film alone be made thinner 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] The present invention employs the following technical means in order to solve the above-mentioned problems. According to the invention of claim 1, the heat-resistant polyester film is anchor-coated by an extrusion coating laminating method, polyethylene is extruded from an extruder through a T-die, an acrylic film is further laminated thereon, and a polyvinyl chloride is further laminated thereon.
The technical means of laminating a composite film formed by laminating a Neal cast film , an adhesive, and a polyvinyl chloride or polypropylene backing film was employed. [0008] The invention according to claim 2 is that the heat-resistant polyester film is anchor-coated by an extrusion coating lamination method, polyethylene is extruded through a T-die by an extruder, and a laminated film comprising fluorine and acrylic is further laminated thereon. The technical means of laminating the laminated composite film thus formed, an adhesive, and a polyvinyl chloride or polypropylene backing film was employed. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is to make an acrylic composite film by an extrusion coating lamination method. An acrylic coating is applied to a heat-resistant polyester film, and a polyethylene film is extruded through a T-die from an extruder. Further, like a composite film formed by laminating an acrylic film thereon, a top coat layer and a colored layer are first formed as a support layer. As a layer below this composite film, the injection molding method,
This is a paintless film in which a polypropylene film or polyvinyl chloride is bonded via an adhesive by an extrusion method and laminated. An embodiment of the present invention will be described in detail with reference to the accompanying drawings. 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. In the first embodiment, a heat-resistant polyester film 1 (for example, 50 μ) is anchor-coated 2 (for example, 3 μ) by an extrusion coating lamination method, and a polyethylene film 3 (for example, 40 μ) is extruded through a T-die from an extruder. And an acrylic film 4 (for example, 50 μ) and a polyvinyl chloride 5 (for example,
0μ). The composite film 6 thus formed has a top coat layer and a colored layer formed thereon as a support layer, and a layer below the composite film 6 is formed by applying a bonding method using a molding method and a molding resin. They must be selected accordingly. 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 the second embodiment, in which each film and adhesive are represented by lines. In the second embodiment, a heat-resistant polyester film 1 (for example, 50 μ) is anchor-coated 2 (for example, 3 μ) by an extrusion coating lamination method, and a polyethylene film 3 (for example, 40 μ) is extruded through a T-die from an extruder. Then, a laminated film 9 (for example, 50 μm) made of fluorine and acrylic is laminated thereon. The laminated composite film 10 thus formed has a top coat layer and a colored layer formed as a support layer, and an adhesive is formed as a lower layer by using 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 you open the mold,
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 can be formed continuously, so that 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. Since it is a molding method that can reduce the material weight and also reduce the cost, it is being studied for side moldings of automobiles and the like. 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) An advantage of appearance is that 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   FIG. 4 is a schematic sectional 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 (1)

Claims: 1. A heat-resistant polyester film is anchor-coated by an extrusion coating laminating method, polyethylene is extruded through a T-die from an extruder, and an acrylic film is further laminated thereon. Polyvinyl chloride
A paintless film characterized by laminating a composite film formed by laminating a Neil cast film , an adhesive, and a polyvinyl chloride or polypropylene backing film. 2. A heat-resistant polyester film is anchor-coated by extrusion coating lamination, and polyethylene is extruded through a T-die by an extruder.
A paintless film characterized by further laminating a laminated composite film formed by laminating a laminated film made of fluorine and acrylic, an adhesive, and a polyvinyl chloride or polypropylene backing film thereon.