KR100229208B1 - The print sheet and the same method - Google Patents

Abstract

The present invention relates to a coated steel sheet which gives a beautiful exterior property to the steel sheet by removing the simplicity of the conventional printed steel sheet product and improves the workability and corrosion resistance, and the constitution is the steel sheet (1) or the steel sheet (1) and the plating layer ( 2) Epoxy- or polyester-based primer coating layer (3) giving elongation, corrosion resistance and adhesion on top, gravure transfer coating layer (4) formed thereon and fluorine or high workability having weather resistance, processability and adhesion It is a gravure transfer printed steel sheet in which the polyester-based top coat layer 5 was formed. In the manufacturing method, roll-coated a gravure transfer primer on a steel sheet, and then heated and dried at 120-290 ° C. to form a primer layer, and then attaching gravure transfer paper to the surface of the primer coating film in a continuous process, and then 140-240 degrees. Press-bonding with an elastic rubber roll heated with seeds to transfer the transfer coating layer of gravure transfer paper onto the primer surface, peel off the remaining transparent transfer paper (PET film), dry the transferred transfer coating layer with hot air, and roll the exclusive top coat After coating, it is heated and dried at 120-290 ° C. to form a coating layer having excellent workability and weather resistance. According to the demand of the consumer, the gravure transfer printing coating layer is pressed down into the surface by embossing rolls with irregularities patterned on the surface. Characterized in that the step of forming a three-dimensional pattern.

Description

Gravure transfer printed steel sheet and manufacturing method thereof

The present invention has a beautiful exterior properties of the steel plate, such as aluminum steel sheet, zinc-aluminum alloy hot dip galvanized steel sheet, copper steel sheet, tin, chromium and nickel plated steel sheet, pipe using each plated steel sheet, galvanized steel plate with electric and hot dip galvanized The present invention relates to a gravure transfer printed steel sheet and a method of manufacturing the same, which are manufactured by attaching a gravure transfer paper to a plated steel sheet coated with a prima paint, and then pressing the resultant as an elastic rubber roll.

In general, the printed steel sheet has a limitation in pattern and color due to being printed as PCM paint in the line equipment of continuous production, it is difficult to express various.

In order to compensate for such drawbacks, the printing frequency is generally increased on the line equipment, and various patterns and colors are given, but due to the color and equipment limitations of the PCM paint, it is difficult to expect a satisfactory effect.

Recently, in order to compensate for the above problems, lamina steel sheet products which have been laminated on steel sheets after various printings on a film are also commercially available, which has disadvantages in terms of environmental pollution during manufacturing.

The present invention has been made in view of the above points, and an object of the present invention is to transfer a special gravure transfer paper having a variety of colors and patterns on the surface of the base steel sheet, and then, by coating a top coat with excellent workability, In addition to showing the appearance and excellent workability and weather resistance, according to the demands of the consumer, the steel sheet is rolled as embossed rolls to give a three-dimensional and changeable state in the existing smooth state, which is very excellent in appearance. For the purpose of manufacture.

Hereinafter, the present invention will be described in more detail with examples.

1 is a cross-sectional view showing a coating state of a gravure transfer printed steel sheet according to the present invention.

* Explanation of symbols for main parts of the drawings

1: holding steel sheet 2: plating layer

3: Prima coating layer 4: Gravure transfer coating layer

5: top coat layer

In the production of gravure transfer printed steel sheet according to the present invention, for example, epoxy- or polyester-based prima excellent in elongation, corrosion resistance and adhesion on the base steel sheet 1 on which the plating layer 2 of about 15-23 μm is formed. After selecting according to the metal material, roll coating to dry film thickness (DFT display) to 5-15㎛, and then heated and dried the roll coated steel sheet in a dry oven to 120-290 degrees Celsius to dry the primer film layer (3). To form.

Then, after attaching the gravure transfer paper on the surface of the coated steel sheet dried to about 30-200 degrees Celsius, and then pressed with an elastic rubber roll heated to 140-240 ℃, after the transfer of the coating film, the surface PET film of the transfer paper is separated and removed. At this time, the gravure transfer coating layer 4 is preferably formed to a thickness of about 5㎛. Thereafter, in order to provide high processability and weather resistance, the dry coating thickness (DFT) of the top coat layer 5 is 18-22 μm by selecting and rolling the fluorine or high process polyester cree top coat according to the application of the product. After roll-coating to be, the roll-coated steel sheet in a dry oven is heated to 120-290 ° C and dried to form a product of the present invention to form a layer as illustrated in FIG.

At this time, the transfer paper used for the gravure electron coating layer 4, which gives a beautiful pattern and color, any pattern required by the consumer using a gravure transfer paper exclusively developed by Yonhap Steel Industry Co., Ltd. and Seoul Chemical. Can be given color.

In addition, the PCM coating material coated with the upper and upper coats does not cause cracks in the coating film uniformity of the processed portion during processing, that is, a gravure-only PCM coating which has good elongation of the coating film and excellent weather resistance is used.

Related materials and their general formula are as follows.

Coating Composition of Gravure Transfer Paper Applied in the Present Invention

Gravure transfer paper used on the surface of the non-absorbent material metal plate is made of heat resistant unlike ordinary gravure transfer paper, it consists of six layers, its structure is a film layer, a release layer, a protective primer layer, a printing layer, a reinforcing layer , Has a structure of an adhesive layer. The coating component of each layer is manufactured by making a partial change according to the resin composition of a bottom coat and a top coat.

Looking at the composition, first, a release layer prepared by mixing acrylic, fluorine, or PE (polyester) resin, PP or PE wax, solvents, etc., for smooth peeling between the transfer film and the film on the excellent stretch PET film And a protective primer layer made of water-soluble polyurethane or oil-based acrylic resins, solvents, and other additives to prevent cracking and adhesion between the print layer and the release layer coral, and pigments to exhibit various colors and patterns. , A printing layer made of acrylic and vinyl resins, solvents, etc., a reinforcing layer mainly formed of polyester resins and pigments, formed between the base steel sheet and the printing layer for heat shielding of the silver foil and the basement Made of acrylic, polyester (PE) or fluorocarbon resin, vinyl, nitrocellulose (NC), and other additive solvents to improve the adhesion between the reinforcing layers Chakcheung is applied in sequence is produced gravure transfer sheet.

[General Properties of Paints Applied to the Present Invention]

General resins used in conventional PCM paints have problems such as bubble generation during hot air drying, adhesion between coatings, and coating cracks during processing due to differences in characteristics from gravure transfer coatings. On the contrary, the paint for undercoat and top coat developed for application to gravure transfer printed steel sheets is manufactured to have no bubble during hot air drying and to maximize adhesion and processability, weather resistance, and corrosion resistance with transfer coating.

In particular, in the case of undercoat, epoxy or polyester resin is used as a base material to maintain the flexibility of the top coat and the transfer coating film, and the elongation in addition to general corrosion resistance, which is the basic physical property of the undercoat itself, and strengthening the adhesion between the transfer coating film and the plated steel sheet, etc. By providing the maximum value, a sufficient buffering action is performed at the interface between the material and the transfer coating film so that the crack of the material generated during processing is absorbed in the lower coating layer without developing to the transfer coating layer and the top coating layer.

Gravure transfer paper and special coating material of the above characteristics, is to be suitable for the beautiful exterior and workability, which is the object of the present invention, after applying it to the steel sheet, by forming a variety of patterns and colors on the surface of the steel sheet forging of existing products The gravure transfer printed steel sheet having a new sensibility characteristics deviated from the roaming is made.

The gravure transfer printed steel sheet according to the present invention was found to be superior to the gravure transfer printed steel sheet according to the present invention as a result of appearance comparison and workability test with the existing printed steel sheet.

That is, the resin layer of the top coat with excellent elongation at first to the external physical pressure at the time of processing gives workability on the surface, and the second coat applied for corrosion resistance and adhesion at the interface between the material and the top coat Thus, the cracks in the material generated during processing are designed to be absorbed in the lower layer without developing to the upper and transfer coating layers. In addition, in terms of surface appearance, by utilizing the characteristics of gravure transfer to express a variety of patterns and colors not only to show a beautiful exterior, but also embossed roll embossed on the steel sheet according to the needs of the consumer to form a three-dimensional pattern on the surface It can be more beautiful.

Experimental data on the above effects are presented below.

1. Machinability Test (T-Bending Test)

Test Method: 10 times magnification after T bending test

Evaluation method: After processing, no crack (non-cracking) degree

As can be seen from the surface photograph below, no crack was generated in the gravure transfer printed steel sheet, but a long vertical crack occurred in the general printed steel sheet. Therefore, the workability of the gravure transfer printing steel sheet according to the present invention was found to be more excellent.

2. Exterior (Surface Pattern)

Surface photo (see surface photo of steel plate below)

As shown in the surface photograph, the gravure transfer printed steel sheet according to the present invention has a beautiful surface, and especially in the case of embossed printed steel sheet, a beautiful pattern is formed, and the exterior property is very excellent.

According to the present invention, as shown in the test results described above, the gravure transfer printed steel sheet according to the present invention was found to be shown to have superior properties in terms of surface appearance and workability, etc., compared to conventional general printed steel sheet. .

Claims (3)

Epoxy- or polyester-based prima coated on the base steel sheet 1 or the base steel plate 1 and the plating layer 2 to provide elongation, corrosion resistance, and adhesion, and to have a dry film thickness (DFT) of 5 to 15 μm. A gravure transfer coating layer 4 having a coating layer 3, an adhesive layer formed on the epoxy or polyester primer coating layer 3, a reinforcing layer, a printing layer, a protective primer, and a release layer, and the gravure transfer coating film Gravure transfer print with a fluorine or highly processed polyester top coat layer 5 having weather resistance, processability and adhesion on the layer 4 and having a dry film thickness (DFT) of 18 to 22 μm. Grater. The gravure transfer printed steel sheet according to claim 1, wherein the gravure transfer coating layer (4) has a thickness of 5 m. Roll-coated gravure transfer primer on the steel sheet, and then heated and dried at 120 ~ 290 ℃ to form a primer layer, and then attached gravure transfer paper on the surface of the primer coating film in a continuous process, and then heated to 140 ~ 240 ℃ After compressing with an elastic rubber roll to transfer the coating layer of gravure transfer paper to the surface of the primer and peeling off the residual transparent transfer paper (PET film), and drying the transferred transfer coating layer by hot air drying, and then roll coating the top coat 120 A gravure transfer printed steel sheet comprising a process of forming a coating layer by heating and drying at a temperature of ˜290 ° C., and forming a three-dimensional pattern on the surface by pressing the gravure transfer print coating layer with an embossed roll with an uneven pattern. Manufacturing method.

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