KR20040082450A - Offset and screen combination printing method - Google Patents

Abstract

PURPOSE: An offset and screen combination printing method for a hot pressing and an injection molding is provided to produce various printed patterns and a printing output swiftly. CONSTITUTION: The offset and screen combination printing method comprises the steps of: first offset printing to prepare a film material and print a transparent heat sensitive bonding agent to a set flip through an offset printer; second color pattern offset printing to four color print to a binder layer of the film obtained by the offset printing; third offset printing to print a mixture of the heat sensitive binder and a printing ink to the film by an offset printer and solidify it to a dry state; screen printing to print an adhesive to the film through a silk screen; solidifying; shape rolling to put the printed film on a hot pressing steel die and shape roll; and injection molding.

Description

OFFSET AND SCREEN COMBINATION PRINTING METHOD}

The present invention relates to a printing method, and more particularly, to an offset and screen combination printing method for IMD (In-Mold Decration) hot pressing and injection molding. Only a few of the IMD printers use the screen printing method because the speed is too low (2000 per hour) and is not suitable for high speed output. Spray printing is complicated. After coloring, the material must be dried by baking or by UV lamps before the next coloration. Direct injection molding is the most commonly used printing method. According to the direct injection molding printing method, the material of the desired color is added before the IMD hot press and injection molding. However, since only one color is provided, this method does not produce a variety of color patterns.

The present invention provides offset and screen combination printing for IMD hot pressing and injection molding that eliminates the drawbacks seen in conventional printing techniques. Combination printing method according to the present invention is (1) primary offset printing, (2) color pattern offset printing, (3) third offset printing, (4) screen printing, (5) baking, (6) shape rolling (shape) rolling), and (7) injection molding. By applying the above-described steps and specially prepared mixed ink, it is possible to obtain a fast print output with various printing patterns.

1 is a diagram illustrating a process of an offset and screen combination printing method according to the present invention.

2 is a diagram illustrating another form of the method of the present invention.

As shown in Fig. 1, the present invention provides (1) primary offset printing, (2) color pattern offset printing, (3) third offset printing, (4) screen printing, (5) baking, and (6) shapes. Rolling rolling, and (7) injection molding.

First, a clothesset printing machine is used for a transparent heat sensitive bonding agent in one film. The transparent thermal binder allows the printing ink to be used in the next printing process to blend with the film material. During the first offset printing process, the thermal bond is dried due to the UV radiation of an offset press at 300 ° C.

After the first process of primary offset printing, the offset printing machine is operated to color four colors the binder layer of one film which will have a defined color pattern and apply UV at 300 ° C. for color printing.

After the second process of color pattern offset printing, the offset printing machine is operated to print the mixed ink on the color printing of the film obtained in the above-described second process and to dry the mixed printing through the first hardening process. The mixed ink is made of a mixture of UV inks, transparent thermal binders and hardening agents and adhesives.

After the third process of the third offset printing, the binder is printed on the mixed ink using a screen printer.

After the fourth process of screen printing, the printed film goes through a hardening operation and becomes dry between 75 ° and 85 ° for 18-25 minutes. The drying temperature and time are determined by the characteristics of the mixed ink and the thickness and material of the film.

After the fourth process of hardening, the well dried film is placed on a hot press steel die, pressed and rolled in a semi-finished state through a shape mill.

After the fifth process of shape rolling, the semi-finished product is placed in an injection molding machine and injection molded into plastic to produce the desired finished product.

2 illustrates an alternative of the present invention. The combination printing method is (1) 1st offset printing, (2) color pattern offset printing, (3) 1st screen printing, (4) 1st solidification, (5) 2nd screen printing, and (6) 1st firmness , (7) shape rolling, and (8) injection molding.

First, the transparent thermal binder is printed on the film using an offset press. The combination allows the printing ink to be used in an additional step to fuse into the film. During the first offset printing operation, the thermal binder is dried by UV radiation at offset printing at 300 ° C.

After the first process of primary offset printing, the offset printing machine is operated to color four colors the binder layer of one film which will have a defined color pattern and apply UV at 300 ° C. for color printing.

After the second process of the color pattern offset printing, the offset printing machine is operated to print the mixed ink on the color printing of the film obtained in the above-described second process and to dry the mixed printing through the first solidification process. The mixed ink is made of a mixture of UV inks, transparent thermal binders and hardening agents and adhesives.

After the third process of primary screen printing, the mixed printing is dried through the primary hardening process.

The binder is printed on the mixed ink using a screen printer during the third offset printing after the fourth process of the first solidification.

After the fifth process of secondary screen printing, the printed film is dried at 75 ° to 85 ° for 18-25 minutes. The drying temperature and time are determined by the characteristics of the mixed ink and the thickness and material of the film.

After the sixth process of secondary hardening, the well dried film is placed on a hot press steel die, pressed and rolled in a semi-finished state through a shape mill.

After the seventh process of shape rolling, the semi-finished product is placed in an injection molding machine and injection molded into plastic to produce the desired finished product.

The prototype of the offset and screen combination printing method is constructed according to the characteristics of FIGS. 1-2. The offset and screen combination printing methods work well and provide all of the above-described characteristics.

While specific embodiments of the present invention have been shown in detail, many possible embodiments are possible.

Claims (12)

How to print offset and screen combination (a) primary offset printing, which prepares the film material and prints the transparent thermal binder on the prepared film through an offset printer, (b) secondary color pattern offset printing in which four-color color printing is printed on the binder layer of the film obtained through offset printing; (c) a third offset printing in which the offset printing machine is operated to print the mixed ink obtained from the mixture of the thermal binder and the printing ink on the color printing of the film, and the mixed ink printed film is dried through the hardening, (d) screen printing, printing an adhesive on the color printing of the film obtained through the silk screen, (e) a binder in which the binder dries the printed film through a firm, (f) Rolling the shape of the printed film into a semi-finished product by placing the printed film on a hot pressing steel die, (g) Offset and screen combination printing method, characterized in that it consists of a step of injection molding the semi-finished product by plastic rolling and molding into a finished product. The method of claim 1, wherein the mixed ink is UV ink, a transparent thermal binder, a curing agent, and an adhesive. The method of claim 1, wherein the transparent thermal binder (a) is dried by applying UV at 300 ° C. during the first offset printing step. The method of claim 1, wherein the color printing is dried by applying UV at 300 ° C. during the (b) secondary color pattern offset printing step. The offset and screen combination printing method according to claim 1, wherein the mixed ink is dried by 300 ° C. hardening for 18 to 25 minutes while the third offset printing is in progress. The method of claim 1, wherein (e) while the solidification is in progress, the adhesive is dried through solidification at about 300 ° C. for 18 to 25 minutes. How to print offset and screen combination (a) primary offset printing, which prepares the film material and prints the transparent thermal binder on the prepared film through an offset printer, (b) color pattern offset printing in which four color printings are printed on the binder layer of the film thus obtained, (c) primary screen printing in which the mixed ink obtained by mixing the printing ink and the binder is printed on the color printing of the film obtained through the offset printer; (d) the film on which the mixed ink has been printed is firstly dried, (e) secondary screen printing, in which adhesive is printed on the mixed ink layer of the film obtained through the silk screen; (f) secondary hardening, in which the adhesive dries the printed film through hardening, (g) shape rolling which presses the printed film on a hot pressing steel die and presses the shape into a semi-finished product through a shape rolling machine; (h) Offset and screen combination printing method characterized in that it consists of a step of injection molding the semi-finished product by plastic rolling and molding into a finished product. The method of claim 7, wherein the mixed ink is UV ink, a transparent thermal binder, a curing agent, and an adhesive. 8. The method of claim 7, wherein the transparent thermal binder (a) is dried by applying UV at 300 ° C during the first offset printing step. The offset and screen combination printing method according to claim 7, wherein the color printing is dried by applying UV at 300 ° C. during the (b) color pattern offset printing step. The offset and screen combination printing method according to claim 7, wherein the mixed ink (c) is dried by 300 ° C. hardening for 18 to 25 minutes while the primary screen printing is in progress. 8. The method according to claim 7, wherein (e) while the secondary screen printing is in progress, the adhesive is dried through hardening at about 300 [deg.] C. for 18-25 minutes.