KR20040071007A - Polyester film stacked metal plates and manufacturing method - Google Patents

Abstract

PURPOSE: A polyester film stacked metal plate and a manufacturing method thereof are provided to print various patterns, shapes and colors directly and easily and to have a good gloss, processability, surface hardness etc. CONSTITUTION: The polyester film stacked metal plate comprises a metal plate(1) formed in a thin metal plate form and having a determined size; a printing layer(2) formed on an upper part of the metal plate and formed by printing an ink paint to a surface of the plate directly; a clear layer(6) formed on an upper part of the printing layer; and a PET layer(3) attached to an upper part of the plate. The clear layer increases an adhesive force and protects the printing layer.

Description

Polyester film stacked metal plates and manufacturing method

The present invention relates to a polyester printed metal plate and a method for manufacturing the same, and more particularly, to print a pattern directly on top of the metal plate, to attach a polyester film to protect the printed layer, and to process it in one process. It is invented to be.

In general, the metal plate used for the exterior of home appliances, cabinet materials, furniture and household goods, interior materials, etc. is aesthetically superior and the surface should not be damaged by external shocks or factors.

Therefore, various patterns, colors, and patterns appear on the surface of the metal plate, and the above-described patterns, colors, and patterns are used for surface treatment to attach a protective film so that they are not damaged during use.

And the method of manufacturing the said metal plate was produced by apply | coating an adhesive agent on the surface of a metal plate, and attaching the colored vinyl chloride film which the transparent polyester film adhered to this surface by the said adhesive agent.

Or the method of coating a transparent polyester paint, after printing directly using the polyester ink on the surface of a metal plate, etc. is used.

However, as described above, the metal plate attached to the surface of the colored polyvinyl chloride film to which the conventional polyester film is bonded is difficult to print various patterns, shapes, and colors required by the metal plate manufacturers by printing the film manufacturer. This was there.

In addition, since vinyl chloride film is used, chlorine and dioxin gas are generated during disposal and incineration of the metal plate, which leads to environmental pollution.

In addition, the metal plate coated with polyester ink on the surface, and coated with a transparent polyester paint, has a clarity due to the limitation of the transparent polyester paint to protect the printing layer (clear the image of the object of the coating film). There was a problem of deteriorating the aesthetics of the printed pattern, shape, color, etc. due to the lack of light) and glossiness.

In addition, the transparent polyester paint has low mechanical properties, and the workability and surface hardness of the metal plate surface-treated with polyester are lowered, so that mechanical weakness occurs, and the surface easily cracks and breaks.

An object of the present invention is to directly print a pattern, shape, color on the surface of the metal plate, to provide a polyester printed metal plate and a method of manufacturing the metal plate manufacturer can easily print a variety of patterns, shapes, colors directly.

Another object of the present invention is to attach a polyester film on the surface of the metal plate printed pattern, shape, color directly to protect the printed pattern, shape, color, excellent gloss and clarity, processability, environmentally friendly at an affordable price The present invention provides a polyester printed metal plate having a chemical conversion and surface hardness and a method of manufacturing the same.

1 is a cross-sectional view showing the structure of the present invention.

2 is a schematic diagram illustrating a process by which the present invention is manufactured.

* Description of the major symbols in the drawings *

1-metal plate 2-printed layer

3-PET Layer 4-Undercoat

5-Middle Floor 6-Upper Floor

7-chemical conversion layer 8-epoxy layer

9-protective vinyl layer 10-metal plate feeder

11-Pretreatment Device 12-Undercoat Coating Equipment

13-Undercoat Paint Dryer 14-Base Paint Painter

15-Base Paint Dryer 16-Printing Machine

17-Top Coating Equipment 18-Top Coating Equipment

19-Polyester film lamination device 20-Surface embossing device

21-Protective vinyl lamination device 22-Metal plate winding device

23-Metal Plate Cutting Machine 24-Stacking Device

The structure of the metal plate for achieving the object of the present invention, the metal plate (1) formed in a thin plate shape of a metal material having a predetermined size;

A printing layer (2) formed on the metal plate (1) and formed by directly printing an ink paint on the surface of the metal plate (1);

A clear layer (6) formed on top of the print layer (2) to increase adhesion and protect the print layer (2);

It is achieved by consisting of a PET layer 3 attached to the top of the metal plate 1 to prevent the printing layer 2 from being damaged during use.

And, in order to achieve the present invention, the intermediate layer forming step of coating the base plate using a high molecular weight polyester resin and a melamine resin as a crosslinking agent on the metal plate (1) and then drying,

A printing step of forming a printing layer (2) by printing a desired pattern and color on the surface of the metal plate (1) which has undergone the intermediate layer forming process by using a printing material for printing directly;

A top layer forming process for protecting a pattern and color printed on the surface through the printing process and coating and drying a top coat mixed with a special resin with a polyester resin as a main material to improve adhesion to a polyester film;

The PET layer forming step of attaching a lollister film having a predetermined thickness to the top of the top coat layer 6 formed through the top coat layer forming step is achieved by successively performing the same line in succession.

That is, the print layer 2 is formed on the upper surface of the metal plate 1 by printing a pattern, shape, and color directly on the surface, so that various patterns, shapes, and colors desired by the metal plate manufacturer can be easily printed. It is.

Further, by attaching a PET layer 3 protecting the print layer 2 on the upper portion of the metal plate 1, various patterns, shapes, and colors printed on the print layer 2 are clearly reflected, and mechanical properties are excellent. Thus, cracks or breakage of the surface of the metal plate 1 can be prevented during long-term use.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention.

1 is a cross-sectional view showing the structure of the present invention, a protective vinyl layer is formed on the upper part of the PET layer to prevent transportation and handling damage, and the metal plate is formed with several layers to increase the mechanical and chemical properties of the metal plate. It is shown.

Figure 2 is a schematic diagram showing a process in which the present invention is manufactured, schematically showing the apparatus for producing a polyester-printed metal plate of the present invention sequentially.

On the other hand, as shown in Fig. 1, the metal plate 1 of the present invention is formed with a chemical conversion layer 7 coated with an upper surface and a bottom surface chromate, and the chemical conversion layer 7 is generally 1 탆 or less. It is formed to a thickness of.

Therefore, the corrosion resistance of the metal plate 1 is increased and it can prevent that it corrodes and damages by water or moisture during long-term use.

The primer layer 4 is formed of a polyester resin on the upper portion of the chemical conversion layer 7 of the metal plate 1 to increase adhesion of the base layer 5 to be described later, and to improve corrosion resistance and workability. ).

In addition, the base layer 5 is formed on the upper layer 4 so as to serve as a base of the printing layer 2 so that the printing layer 2 is adhered to the surface of the metal plate 1 and printed. This intermediate layer 5 has excellent properties in improving adhesion with ink paint by using a polymer polyester resin as a main resin and a melamine resin as a crosslinking agent.

On the other hand, the shape, pattern and color desired by the company by using the ink coating on the metal plate (1) formed with the chemical conversion treatment layer (7), the lower coating layer (4), the intermediate layer (5) formed thereon as described above Is printed directly to form the printed layer (2).

That is, since the printing layer (2) is formed by printing directly on the surface of the metal plate (1) using an ink paint, it is possible to easily print the shape, pattern and color desired by the company, to manufacture a variety of products As a result, it is possible to reduce manufacturing costs because it does not have to spend printing costs on separate film companies.

In addition, a PET layer 3 formed by attaching a polyester film by roll compression is formed on the top of the print layer 2 to prevent the print layer 2 from being worn and damaged during use.

On the other hand, the upper layer of the printed layer (2) to increase the adhesive force to which the PET layer (3) is attached, to form a clear layer (6) to protect the printed layer (2), this top coat layer (6) The coating material which forms is used what added melamine resin to the polyester resin as a crosslinking agent.

In addition, a protective vinyl layer 9 is laminated on the PET layer 3 to prevent damage such as scratches or the like from occurring on the PET layer 3 during transportation or handling.

Moreover, it is preferable to form the epoxy layer 8 which improves corrosion resistance and adhesiveness in the bottom face of the said metal plate 1.

On the other hand, as the metal plate 1 used in the present invention, all known metal plate 1 bodies such as cold rolled steel sheets, electric and hot dip galvanized steel sheets are applicable, and the method for achieving the present invention is as follows.

As shown in FIG. 2, the metal plate 1 is introduced into the pretreatment device 10 through the metal plate supply device 10 to remove impurities such as oils, moisture, rust, etc. present on the surface of the metal plate 1. In order to increase the corrosion resistance of the metal plate 1 and to increase the adhesion to the undercoat layer 4 to be described later, the pretreatment process is performed to form the chemical conversion layer 7 by coating chromate.

In addition, the metal plate 1 subjected to the pretreatment process is transferred to the undercoat coating device 12 to use the polyester resin as the undercoat in order to increase adhesion to the intermediate layer 5 to be described later and to improve corrosion resistance and workability. After the coating is transferred to the undercoat drying apparatus 13 and dried to form a undercoat layer.

In addition, the metal plate 1 that has undergone the undercoat layer forming process is transferred to the base paint coating device 14 and painted, and then transferred to the base paint drying device 15 to be dried to form a middle layer 5 to form the middle layer 5. The process is done.

On the other hand, the base coating used in the intermediate layer forming process is a polymer polyester resin having a molecular weight of 10,000 to 13,000, a glass transition temperature (Tg) of 30 to 40 ℃, melamine resin (HMMM, HexaMethylMethoxyMelamine) as a crosslinking agent By using, excellent workability is exhibited, and in particular, it has excellent properties of transferability and adhesion with ink paint for clear printing during printing.

Then, the metal plate 1 subjected to the intermediate layer forming process is transferred to the printing apparatus 16 and goes through a printing process of printing various patterns and colors directly on the surface of the metal plate 1 using an ink paint.

On the other hand, the ink coating used in the printing process is attached to the intermediate layer (5) using a molecular weight of 20,000 to 25,000, a glass transition temperature (Tg) made of a polymer linear polyester resin of 0 to 10 ℃ It is preferable to use an inorganic pigment to increase adhesion and to stably work in a continuous coating line by using a polyester resin having a low OH value, and to improve weather resistance as a pigment used in the ink coating.

In addition, the metal plate 1 subjected to the printing process is transferred to the top coat coating device 17, the molecular weight is 8,000 ~ 10,000, the glass transition temperature (Tg) is 5 ~ 15 ℃, and the amorphous polyester film to be described later Melamine resin (HMMM, HexaMethylMethoxyMelamine) is used as a crosslinking agent to polyester resin having an OH value of 5 or less so that the adhesive strength of the resin is increased. Finish the layer forming process.

In addition, the metal plate 1 having completed the top coat layer forming process is transferred to the polyester film laminating apparatus 19, and a polyester film is attached by roll compression, and the polyester film is amorphous poly having excellent heat sealability. Using an ester film (PET; Polyethylenterphalate), the PET layer forming process is completed.

That is, as described above, the present invention can be manufactured in the same line, thereby increasing economical efficiency and reducing manufacturing cost, and easily printing patterns and colors desired by a company.

On the other hand, it is preferable that the composition ratio of each paint used in each of the above-described process is as shown in Table 1 below for the increase of adhesion and printability.

Polyester Index Melamine index Acid catalyst Fee Solvent Other Base paint 30 to 35% 5-10% 0 to 2% 30 to 35% 15 to 20% 0 to 2% Ink paint 50 to 60% 1 to 5% 0% 10 to 20% 10 to 20% 0 to 2% Topcoat 60 to 70% 10 to 20% 0 to 2% 0% 5-10% 0 to 2%

And the coating film thickness of each layer formed in the upper part of the metal plate 1 is 5-10 micrometers of the undercoat layer 4, 12-20 micrometers of the intermediate | middle layer 5, 1 micrometer or less of ink layers, and the top coat layer 6 It is preferable to form in 5-10 micrometers.

Meanwhile, the metal plate 1 subjected to the PET layer forming process is transferred to the surface embossing treatment device 20 and pressed down with a metal roll having irregularities to undergo an diffuse reflection surface forming process for embossing and diffuse reflection on the surface of the polyester film. .

Then, the metal plate 1 subjected to the diffuse reflection surface forming process is transferred to the protective vinyl laminating device 21, and the protective film layer 9 is laminated on the PET layer 3, and then, by the metal plate winding device 22. After winding, it is cut according to the specification by the metal plate cutting device 23, and is subjected to a finishing process loaded by the loading device 24, thereby completing the manufacture of the present invention in one process.

On the other hand, specific embodiments of the present invention manufactured by performing the above process in one line are as follows.

In the continuous coating line, a chromate coating layer is formed on the metal plate (1) of an electro-zinc steel sheet (EGI) having a thickness of 0.5 mm through a pretreatment process, and thereafter, when the primer paint is dried, the coating thickness is 5-10 μm. After coating the roll so as to form the undercoating layer 4 by heat drying at a curing temperature (PMT; Peak Metal Temperature) 180 ~ 230 ℃ in a hot air drying apparatus.

Then, the base coating is roll-coated to have a coating film thickness of 12 to 20 µm when dried, and then heated and dried at a curing temperature of 200 to 250 ° C. in a hot air drying apparatus to form a middle layer 5. After printing the ink paint on the formed metal plate (1) by gravure printing method, roll coating is applied so that the coating thickness is 5-10㎛ when drying the top coat, and then dried by heating to a curing temperature of 180 ~ 230 ℃ in a hot air drying apparatus To form layer (6).

Then, as described above, the heat-sealable amorphous polyester film was laminated on the coated metal plate 1 while maintaining the line speed of 50 M / min and the temperature of the metal plate 1 immediately before lamination at 215 ° C. as described above. A polyester film printed metal plate is manufactured.

On the other hand, the physical properties of the polyester film printed metal plate prepared as described above are as shown in Table 2 below.

Test Items Test Methods Pencil hardness UNI-Pencil (500g load) H or more Adhesive ERICHSEN (6m / m) 100/100 Impact IMPACT (C1 / 2 "x 500g x 50Cm) No crack Machinability 180 ° BENDING (20 ℃, 0T) No crack Heat resistance 170 ℃ x 1Hr No change Chemical resistance 5% CH3COOH, 25 ℃ x 24Hrs No change 5% NaOH, 25 ° C x 24Hrs Pollution resistance LIPSTICK, 25 ℃ x 24Hrs Easy to remove MAGIC (Red, Blue, Black), 25 ℃ x 24Hrs

According to the configuration of the present invention described above, since the polyester film is laminated after printing the printing paint directly on the surface of the metal plate, it is possible to manufacture a variety of metal plate manufacturers.

Therefore, it is a very useful invention that can be used in various applications as a home appliance material and building, exterior material to increase the productability and economical efficiency of the product.

Claims (4)

A metal plate 1 formed in a thin plate shape of a metal material and having a predetermined size; A printing layer (2) formed on the metal plate (1) and formed by directly printing an ink paint on the surface of the metal plate (1); A clear layer (6) formed on top of the print layer (2) to increase adhesion and protect the print layer (2); A polyester film laminated metal plate, characterized in that composed of a PET layer (3) attached to the upper portion of the metal plate (1) to prevent the printing layer (2) from being damaged during use. A middle layer forming step of coating the base plate using a high molecular weight polyester resin on the metal plate 1 and using a melamine resin as a crosslinking agent, followed by drying; A printing step of forming a printing layer (2) by printing a desired pattern and color on the surface of the metal plate (1) which has undergone the intermediate layer forming process by using a printing material for printing directly; A top layer forming process for protecting a pattern and color printed on the surface through the printing process and coating and drying a top coat mixed with a special resin with a polyester resin as a main material to improve adhesion to a polyester film; The PET layer forming process of attaching a lollister film having a predetermined thickness to the upper portion of the top coat layer 6 formed through the top coat layer forming process is sequentially performed in the same line. Manufacturing method. The coating film thickness of each layer formed on the upper part of the metal plate 1 which went through the said intermediate | middle layer forming process, the printing process, and the top coat layer forming process is 5-10 micrometers, and the intermediate | middle film | membrane of Claim 2 characterized by the above-mentioned. The layer (5) is formed in 12-20 micrometers, an ink layer 1 micrometer or less, and a top coat layer (6) 5-10 micrometers, The manufacturing method of the polyester film laminated metal plate characterized by the above-mentioned. The method according to claim 2, wherein the metal plate (1) having undergone the PET layer forming process is subjected to a diffuse reflection surface forming step of pressing down with a metal roll having irregularities and embossing and diffuse reflection on the surface of the polyester film. The manufacturing method of an ester film laminated metal plate.