KR19990003289A - Manufacturing method of polyester film laminated metal plate body - Google Patents

Abstract

PURPOSE: The present invention is to solve such a conventional problem, and has a very good surface property and designability at a relatively low price, as well as excellent glossiness at the time of secondary processing, no microcracks, and no peeling of the film. An object of the present invention is to provide a polyester film laminated metal plate body which can be used as an electric component, a cabinet material, a furniture and household material, an interior building material, and the like that require sex and design.

Composition: The transparent polyester film is composed of an inner layer of amorphous linear polyester having a melting point above 150 ° C. and below 250 ° C., and an outer layer of biaxially oriented polyester having a melting point above 250 ° C. and having a crystallinity of 30% or more. A method for producing a polyester film-laminated metal plate body, characterized in that a film printed on one side of a co-extruded composite polyester film is laminated on a high-temperature metal plate body that has been chromated and painted in a continuous coating line by using a pressing roll.

Description

Manufacturing method of polyester film laminated metal plate body

The present invention relates to a method for producing a polyester film laminated metal plate body. More specifically, the polyester film laminated on one side is laminated on a high temperature metal plate body which has been chromated and painted in a continuous coating line by using a squeeze roll to produce a polyester film laminated metal plate body having excellent surface properties and designability. It relates to a manufacturing method.

(Conventional technology)

In general, metal plates used as electrical parts, cabinet materials, furniture and household materials, interior materials, etc. are required to have excellent surface properties and designability. It is used for processing.

Currently, two methods have been well known as the surface processing and treatment methods of the metal plate used to produce the metal plate having excellent surface properties and designability. The first method is a method of laminating a colored vinyl chloride film on which a transparent polyester film is bonded to a metal plate body coated with an adhesive. The second method is a transparent paint after printing by gravure printing on a coated metal body. How to paint. However, the first method is not only expensive because colored vinyl chloride bonded with a transparent polyester film is manufactured through various processing processes, but also because vinyl chloride is used, chlorine and dioxin gases are reduced during melting to recycle metal plates. There is a disadvantage in that it is difficult to recycle the metal plate because of the problem that causes the environmental pollution. In addition, in the second method, since the coating, printing, and coating of the transparent paint are performed on the metal plate body, not only the surface property is bad, but also there is a problem in that gloss decreases and fine cracks are generated at the processing site during the secondary processing.

It is a known technique to laminate a synthetic resin film on a metal plate such as a metal strip. Polyester films are frequently used to laminate on metal plates to impart excellent properties to the metal plates. Usually, a crystalline and oriented polyester film is laminated on a metal plate, because the crystalline and oriented polyester film has excellent chemical, thermal, physical and mechanical properties simultaneously. However, it is known that such crystalline and biaxially oriented polyester film is not easy to be laminated on a metal plate body.

Generally, two methods of continuously laminating an oriented resin film on a metal plate are well known. The first method is to use a metal plate body coated with an adhesive. That is, initially, an adhesive on which the thermosetting resin is mainly dispersed in a solvent is applied to the surface of the metal plate body. Next, after curing the adhesive, the synthetic resin film is laminated on a metal plate and heated in a large oven for several minutes. Thereafter, the metal plate body on which the synthetic resin film is laminated is cooled. The second method is to use a synthetic resin film coated with an adhesive. In this case, the synthetic resin film is laminated on the metal plate and heated for a long time in a large capacity oven as in the first method. However, these methods have a problem in that it takes a long time to heat the adhesive after curing the adhesive film and laminating the resin film. In some cases, since the moldability of the thermosetting resin used as the adhesive is not good, the laminated synthetic resin film may be peeled off from the surface of the metal plate during processing.

The present invention is to solve such a conventional problem is not only excellent surface properties and designability at a relatively low price, but also excellent glossiness during the secondary processing, there is no microcracks and peeling of the film at all An object of the present invention is to provide a polyester film laminated metal plate body which can be used as electrical parts, cabinet materials, furniture and household goods, interior building materials and the like that require designability.

(Means to solve the task)

In order to achieve the above object, in the present invention, one side of the transparent polyester film is printed to obtain a lamination film, and then laminated on a high temperature metal plate body which has been chromated and painted in a continuous coating line by using a pressing roll. It is characterized by producing a polyester film laminated metal plate body having excellent properties and designability.

Hereinafter, the present invention will be described in detail.

The polyester film used in the present invention has a biaxially oriented linear polyester film having a melting point of more than 150 ° C. and less than 250 ° C., and an inner layer which is actually an amorphous linear polyester, and a melting point of more than 250 ° C. and having a crystallinity of 30% or more. It is preferably produced by coextrusion with a composite polyester film composed of an outer layer. It is preferable that the melting point of the inner layer, which is an amorphous linear polyester serving as an adhesive layer, is around 200 ° C, and the thickness of the inner layer is in the range of 20 to 30% of the total film thickness. The total thickness of the composite polyester film should be 15 to 100 µm, preferably 15 to 50 µm, but is not limited to such a range. If the thickness is 15㎛ or less, problems occur in manufacturing and physical properties. If the thickness is 100㎛ or more, it is economically inadequate. The polyester film may be subjected to hard coating on the surface of the outer layer which is a biaxially oriented linear polyester for the purpose of improving scratch resistance and the like.

One of the important features of the present invention is the use of an adhesive paint which exhibits excellent adhesion at the same time as non-crystalline linear polyester which is an inner layer of a metal plate body and a composite polyester film. The purpose of coating the paint on the metal plate is to give a variety of colors, but using the conventional paint used in the continuous coating line it becomes impossible to manufacture the metal plate and the composite polyester film laminated metal plate. Therefore, the present invention has developed and used an adhesive paint which simultaneously exhibits excellent adhesion with amorphous linear polyester which is an inner layer of a metal plate body and a composite polyester film. Although there is no limitation on the resin of the adhesive paint used to impart color, it is based on a high polymer resin, that is, a high-molecular polyester resin, which has excellent workability to secure excellent processability. It was prepared by adding a small amount of the additive for. The thickness of the adhesive paint coated on the metal plate is not limited, but is preferably in the range of 10 to 20 μm, and there is no limitation in the coating method.

Another important feature of the present invention is the use of an ink excellent in adhesion between the adhesive paint and the amorphous linear polyester, which is the inner layer of the composite polyester film. When the transparent composite polyester film is laminated on a metal plate body coated with an adhesive paint without printing, only a monochromatic polyester laminated metal plate body having excellent gloss can be obtained. Therefore, in order to manufacture a polyester film laminated metal plate having excellent surface properties and designability and exhibiting various textures, printing should be performed on a transparent polyester film, and in order to protect a printed layer, a printing is a composite polyester film laminated with a metal plate body. It must be done on the inner layer of. However, when the printing ink is used, there is a problem in that printing is limited because adhesion between the inner layer of the composite polyester film and the adhesive paint coated on the metal plate is hindered by the printing layer, resulting in poor adhesion. In order to solve this problem, in the present invention, an adhesive paint coated on the inner layer of the composite polyester film and the metal plate and an adhesive resin exhibiting excellent adhesive strength were used and developed. Since the polyester film-laminated metal sheet produced by the present invention is manufactured by simple thermocompression bonding, a hot melt adhesive resin, that is, a polymer acrylic resin capable of obtaining adhesive force by simple thermocompression among various kinds of adhesives, has been developed and inkized.

The metal plate body used in the present invention is a steel sheet or an aluminum plate with or without surface treatment. In order to improve the adhesion between the metal plate and the adhesive paint, it is preferable to first chromate treatment on the metal plate, and to further improve the rust resistance, primer treatment may be performed after the chromate treatment. Therefore, the polyester film printed on one side is not directly laminated on the metal plate, but is laminated on the adhesive paint coated on the metal plate, so there is no limitation on the metal plate that can be used.

The heating of the metal plate body required for the polyester film lamination in the present invention utilizes heating for curing the adhesive coating coated on the surface of the metal plate body without performing a separate process. The heating temperature of the metal plate should be 200 ~ 250 ℃ and preferably 210 ~ 230 ℃. If the temperature of the metal plate is less than 200 ° C., the melting of the inner layer of the composite polyester film is insufficient, resulting in poor adhesion. If the temperature of the metal plate is 250 ° C. or higher, the crystal orientation of the outer layer of the composite polyester film is lowered, which lowers the corrosion resistance and workability. There is this.

The present invention will be described with reference to the drawings.

After the coil-shaped metal plate body is charged into the metal plate body supply device of the continuous coating line of FIG. 13, pretreatment is performed to remove impurities present on the surface of the metal plate body. After the pretreated metal plate is subjected to a chromate treatment and a drying process, the adhesive paint is coated by a conventional roll coating method. To dry the coated adhesive paint, the metal plate is heated in an oven heated to a high temperature to heat the metal plate to cure the adhesive paint, and at the same time, one side of the high temperature metal plate coated with chromate and the adhesive paint The composite polyester film, which was printed using an ink based on a hot melt adhesive resin on the inner surface), was pressed with a pressing roll to laminate a polyester film on a metal plate. After lamination, cooling is performed, and then wound on a metal sheet winding apparatus to produce a polyester film laminated metal sheet having excellent coil surface and designability at a low price.

(Example 1)

A polyester film prepared by printing an ink based on a hot melt adhesive resin on one side of a transparent composite polyester film having a thickness of 30 μm was pretreated, chromated and coated with an adhesive paint in the continuous coating line of FIG. 1. It was laminated on the treated hot-dip galvanized steel sheet having a thickness of 0.5mm under the following conditions to prepare a polyester laminated metal sheet.

Lamination Condition:

Line speed: 40 mpm

Temperature of steel sheet just before lamination: 224 ℃

Table 1 shows the physical properties of the prepared polyester metal plate.

(Example 2)

In Example 1, the metal tube body was implemented similarly to Example 1 except having carried out the primer process before adhesive paint coating treatment.

(Example 3)

In Example 1, it carried out similarly to Example 1 except having used the aluminum plate instead of the hot-dip galvanized steel sheet.

TABLE 1

1 is a schematic diagram of a continuous coating line.

2 is a cross-sectional view of a polyester film laminated metal plate body produced according to the present invention.

* Explanation of the sign

DESCRIPTION OF SYMBOLS 1 Steel plate supply apparatus, 2 granular looper, 3 pretreatment apparatus, 4 roll coating machine, 5 oven, 6 laminate roll, 7 film supply apparatus, 8 exit shaft looper, 9 steel sheet winding apparatus, 10: Transparent polyester film, 11 printing layer, 12 coating layer, 13 chromate layer, 14 steel sheet, 15 backside coating

The reason why the polyester metal plate body having excellent surface properties and designability at a low price is obtained in the present invention is that the laminated film used in the present invention can be produced by printing only a transparent polyester film, so that the laminated film can be produced at a low price.

Claims (10)

A method for producing a polyester film-laminated metal plate body, characterized in that a film printed on one side of a transparent polyester film is laminated on a high-temperature metal plate body that has been chromated and painted in a continuous coating line using a squeeze roll. The outer layer of a biaxially oriented polyester according to claim 1, wherein the polyester film has an inner layer wherein the melting point is an amorphous linear polyester having a melting point of more than 150 ° C and less than 250 ° C, and a biaxially oriented polyester having a melting point of more than 250 ° C and at least 30% crystallinity. It is a co-extrusion composite polyester film comprised from a layer, The manufacturing method of the polyester film laminated metal plate body characterized by the above-mentioned. The method for producing a polyester film-laminated metal plate body according to claim 2, wherein the thickness of the inner layer which is crystalline linear polyester is 20 to 30% of the total composite polyester film thickness. The method for producing a polyester film-laminated metal plate body according to claim 1, wherein the paint coated on the metal plate body is an adhesive paint based on a high polymer resin. The method for producing a polyester film laminated metal plate body according to claim 1, wherein the printing ink is based on a hot melt adhesive resin. The method for producing a polyester film-laminated metal plate body according to claim 1, wherein the heating temperature of the coated metal plate body is 200 to 250 ° C. The method for producing a polyester film-laminated metal plate body according to claim 1, wherein the metal plate body is a steel sheet or an aluminum plate with or without surface treatment. The method according to claim 1, wherein the total thickness of the composite polyester film is 15 to 100 µm. The method for producing a polyester film-laminated metal plate body according to claim 1 or 4, wherein the high polymer resin is a high molecular polyester resin. The method for producing a polyester film-laminated metal plate body according to claim 1 or 5, wherein the hot melt adhesive resin is a polymer acrylic resin.