KR19990065594A - Manufacturing method of transfer stamping foil - Google Patents

Abstract

The present invention relates to a method for manufacturing a transfer / stamping foil for printing, and more particularly, to a method for manufacturing a transfer / stamping foil for printing that can be used for outdoor advertising by forming a printing layer having good printability on a surface layer when transferring a metal foil to a substrate. will be.

Description

Manufacturing method of transfer stamping foil

The present invention relates to a method for manufacturing a transfer / stamping foil for printing, and more particularly, to a method for manufacturing a transfer / stamping foil for printing that can be used for outdoor advertising by forming a printing layer having good printability on a surface layer when transferring a metal foil to a substrate. will be.

The transfer stamping foil is a metal vapor deposition foil used for a stamp. Foil stamping is a type of transfer printing that uses thermal transfer foil instead of ink. This foil stamping has the advantages of simpler equipment and manufacturing process compared to other printing methods, does not cause pollution compared to printing and wet plating, and in particular, in the case of metal foil, it is possible to form a metal layer even where it is difficult to deposit. Therefore, the demand for it is increasing.

This work of foil stamping involves placing a specially-made stamping foil on a substrate such as paper or plastic, and thermally transferring it by pressing a heated metal plate thereon to imprint characters or figures on the surface of the substrate such as paper or plastic. Only the part in contact with the uneven portion of the plate is heated so that the metal deposited on the foil is adhered to the product and the portion not transferred is peeled off to form a gold foil pattern as if only that part of the product was vacuum deposited. When the binder resin is applied to the textile fabric in a specific pattern shape, and the stamping foil is thermally laminated together with the maturing, the peeled after aging is applied. Only the applied pattern shape remains on the fabric and other parts are peeled off to form a gold leaf pattern on the textile fabric. . In such foil stamping, sharp peeling is required when peeling off portions that are not transferred to maintain the resolution of the desired pattern. Alternatively, the method of transferring the entire surface of the metal foil through paper or plastic, fiber cloth, or the like is widely used.

In general, a stamping foil used for stamping a foil is formed by sequentially forming a release layer, a printing layer (pattern layer), a metal deposition layer, and an adhesive layer on a substrate, and a double printing layer is formed by dissolving a polymer resin in a mixed solvent and then applying a desired pattern color. It is formed by adding the required dye and gravure coating. The printed layer thus formed is exposed to the surface of the upper layer of a substrate such as paper, plastic, or textile fabric after thermal transfer through various processing steps. Recently, the printed layer is printed again and used for multi-purpose, for example, advertising. Reusing In such a case, the printing layer or the like used for a normal stamping foil is almost impossible to print because there is no mutual affinity for inks used for various printing, in particular for an automatic printer.

The present inventors have made efforts to overcome the problems of the prior art as mentioned above, and as a result of applying the special printing layer having excellent printing affinity by breaking the existing concept as a printing layer, the metal foil having excellent printing characteristics during reworking after transfer and stamping is applied. It has been found that it can be produced to complete the present invention.

Accordingly, an object of the present invention is to provide a method for producing a stamping foil having excellent printability after transfer and stamping.

The present invention provides a transfer / stamping foil in which a release layer, a printing layer (pattern layer), a metal deposition layer, and an adhesive layer are sequentially formed on a substrate, wherein the printing layer has a glass transition temperature of 50 to 100 ° C. and a hydroxyl group of 10 to 80. (mgKOH / gr) of 5 to 55 parts by weight of the acrylic copolymer, 15 to 80 parts by weight of silica having an average particle diameter of 1.0 to 10.0 μm, and 15 to 65 parts by weight of the hydrophilic soluble resin. It relates to a manufacturing method.

It is preferable that the acryl-type copolymer used for this invention consists of acrylic acid or methacrylic acid, and those alkyl esters.

The hydrophilic soluble resin used in the present invention is preferably polyvinylpyrrolidone resin or a copolymer thereof, polyvinyl alcohol or a copolymer thereof.

Hereinafter, the present invention will be described in detail.

As the base material constituting the stamping foil in the present invention, a plastic polymer film may be used, and a polyethylene terephthalate film is mainly used. The release layer of the stamping foil of the present invention is formed by dissolving cellulose-based resin in a mixed solvent of toluene, acetone, butylacetate, and then applying the solution with a gravure coating on a substrate to evaporate the solvent.

In the present invention, the print layer, that is, the print layer having excellent printability, is obtained by dissolving the above-mentioned acrylic copolymer having excellent printability in toluene, methyl ethyl ketone, ethyl acetate, methyl cellosolve, methanol alone or in a mixed solvent. After the dye is added here to implement various colors as necessary, it is formed by gravure coating on the substrate on which the release layer is formed.

In the present invention, the metal deposition layer is formed by laminating a metal deposition film such as aluminum on a pattern layer (printing layer).

The adhesive layer of the transfer / stamping foil of the present invention is formed by dissolving a polymer resin in a mixed solvent and then applying a coating liquid having a pigment dispersed thereon as necessary on a metal deposition layer.

The most important printed layer in the present invention will be described in more detail below.

The printing layer (pattern layer) of the present invention is coated on a release-treated polyethylene terephthalate film, which has a coating thickness of at least 1 to 20 μm and 5 to 55 weight of the polymer resin (A) depending on the application. The hydrophilic soluble resin (B) is characterized by consisting of 15 to 65 parts by weight and silica (C) of 15 to 80 parts by weight. The polymer resin (A) used in the printing layer is an acrylic copolymer having a glass transition temperature of 50 to 100 ° C. and a hydroxyl group of 10 to 80 (mgKOH / gr), and the silica having a component (C) has an average particle diameter of 1.0 to It should be prepared to be 10.0 μm. The hydrophilic soluble resin of component (B) used polyvinylpyrrolidone resin or copolymer thereof having excellent water adsorption property, polyvinyl alcohol, and copolymer thereof. Such resins include polyol resins and air products of Dongyang Chemical. Airvol resin of the company, C-polymer of Kuraray of Japan, etc. can be used. In the case of the (A) polymer resin which is an acrylic copolymer, when the glass transition temperature is less than 50 ° C., stickiness occurs after application, and when it exceeds 100 ° C., the coating property is poor. In addition, when the hydroxyl value is less than 10 (mgKOH / gr), the wettability (wetting) is worse, and when the hydroxyl group is more than 80 (mgKOH / gr), the surface hardness is lowered and durability is worsened. When the content of the polymer resin is less than 5 parts by weight, the adhesion with the metal film is poor, and when the content of the polymer resin is greater than 55 parts by weight, the ink absorbency is lowered and the printability is lowered.

In the present invention, the hydrophilic soluble resin (B) is 15 to 65 parts by weight with respect to 100 parts by weight of the printed layer after drying, but less than 15 parts by weight of the ink absorbency is lowered, the storage durability is significantly lower than 65 parts by weight.

Silica particle (C) is an important component which influences printability, and may use together different silica. If the average particle diameter is less than 1.0 mu m, the initial printability deteriorates. If the silica (C) is less than 15 parts by weight based on 100 parts by weight after drying the printed layer, the sharpness after printing is lowered, and when it exceeds 80 parts by weight, the dispersibility of the particles becomes extremely bad.

In the present invention, in the case of other coating layers except for the printing layer (pattern layer), a transfer / stamping foil having excellent printability is produced using a conventional method and a raw material.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples.

The polymer resin which is component (A) was put together below.

Tg (℃) OH number (mgKOH / gr) Polymer resin 65 60 Polymer resin (B) 70 25 Polymer resin (C) 30 35 Polymer resin (D) 105 15

Silica which is component (C) was put together in the following table.

Particle size (㎛) Silica (1) 3.5 Silica (2) 1.8 Silica (3) 12.0

Example 1

A solution obtained by dissolving 3 parts by weight of cellulose in a mixed solvent of 2: 1: 2 mixed with toluene, acetone, and butyl acetate was gravure coated on the surface of the polyethylene terephthalate film, and the solvent was evaporated to form a release layer having a thickness of 0.1 μm. Subsequently, the polymer resin (a) having excellent printability as the main resin was added to 81.6 parts by weight of a mixed solvent of methanol and methylcellulose and 7 parts by weight of 50% dilution solution and 5 parts by weight of polyvinyl pyrrolidone (ISP, PVP K-90). Part and 6.4 parts by weight of silica (1) were added, and the coating solution obtained by homomixing at 2500 rpm for 2 hours was applied to a thickness of 2 μm, dried, and then a 300 A thick aluminum deposited film was deposited on the thus formed printed layer to form a metal. A vapor deposition film was formed. Subsequently, 100 parts by weight of the acrylic resin and 40 parts by weight of the polyurethane resin were dissolved in a mixed solvent in which dimethylformamide, methyl ethyl ketone, and toluene were mixed in a ratio of 1: 1.2, respectively, and then 4 parts by weight of silica pigment was dispersed with vigorous stirring. Was applied on the metal deposited film to form an adhesive layer having a thickness of 3 μm to prepare a stamping foil of the present invention. The physical properties of the prepared stamping foil were measured using the following evaluation method, and the results are shown in Table 1 below.

Example 2

A solution obtained by dissolving 3 parts by weight of cellulose in a mixed solvent of toluene, acetone, and butyl acetate in a 2: 1: 2 solution was subjected to gravure coating on the surface of the polyethylene phthalate film, and the solvent was evaporated to form a release layer having a thickness of 0.1 μm. Subsequently, 9 parts by weight of a polymer resin (B) having excellent printability as a main resin (b) was added to 78.3 parts by weight of a mixed solvent of methanol and methylcellulose, and 9 parts by weight of silica (2) and 4.5 parts by weight of silica (2) were then homogenized at 2500 rpm for 2 hours. After mixing, 5 parts of polyvinyl pyrrolidone (ISP, PVP K-90) was slowly added, and then the homogeneous coating solution was applied to a thickness of 8 μm and dried, and then dried on a printed layer of 300 A thickness. An aluminum vapor deposition film was laminated to form a metal vapor deposition film. Subsequently, 10 parts by weight of the acrylic resin and 40 parts by weight of the polyurethane resin were dissolved in a mixed solvent in which dimethylformamide, methyl ethyl ketone, and toluene were mixed in a ratio of 1: 1: 2, respectively, and then 4 parts by weight of silica pigment was dispersed with vigorous stirring. The coating liquid was applied onto the metal deposition film to form an adhesive layer having a thickness of 3 μm to prepare a stamping foil of the present invention. The physical properties of the prepared stamping foil were measured using the following evaluation method, and the results are shown in Table 1 below.

Comparative Example 1

Same as Example 1, but a polymer resin (C) was used instead of the polymer resin (A). The physical properties of the prepared stamping foil were measured using the following evaluation method, and the results are shown in Table 1 below.

Comparative Example 2

Same as Example 1 except that polymer resin (D) was used instead of polymer resin (B). The physical properties of the prepared stamping foil were measured using the following evaluation method, and the results are shown in Table 1 below.

Comparative Example 3

Same as Example 2 except that silica (3) was used instead of silica (1). The physical properties of the prepared stamping foil were measured using the following evaluation method, and the results are shown in Table 1 below.

Assessment Methods

In the case of evaluating printability, the print layer composition was evaluated after coating on a PET film, and the stamping property and transferability were finally evaluated after application to paper and textile fabrics.

1. Ink initial absorbency

Immediately after printing the evaluation picture with an inkjet plotter (HP Designjet 705C), the clean A4 paper was covered, rubbed evenly, and the degree of bleeding was evaluated.

Level 1: rarely buried

2nd level: slightly buried

Level 3: Buried A Lot

Level 4: almost buried

2. ink drying speed

After printing a picture for evaluation with an inkjet (HP Designjet 705C), the time taken for the ink to dry completely was measured.

3. Resolution

After printing a picture for evaluation with an inkjet (HP Designjet 705C), the ink was completely dried and the bleeding portion of the interface was observed under a microscope to measure its length.

4. Water resistance

After printing and drying the inkjet (HP Designjet 705C) evaluation picture, the water was sprayed with a sprayer and completely wetted for 1 minute. Then, the surface was dried with a tissue and the surface was pushed at a 45 degree angle with a dry cotton swab to measure the surface strength.

Level 1: Not pushed at all

Grade 2: The surface layer is slightly pushed out

3rd grade: a lot of surface layer

4 ratings: pushed to the bottom

5. Glass transition temperature

The acrylic copolymer was completely dried in a vacuum oven at 100 ° C., and then evaluated by measuring Tg with a DSC 7 series of Perkin Elmer.

6. hydroxyl

5 g of acryl anhydride copolymer was dissolved in 100 ml of acetic anhydride / pyridine (1: 3) for 60 minutes at 100 ° C., followed by acetylation by adding 5 ml of pure water and 50 ml of pyridine, followed by titration with N / 2 KOH. It calculated by the following formula.

Hydroxyl group = (empty test ml-main test ml) (fN / 2KOH * 28) / (acryl copolymer gr)

7. Friction Coefficient

After laminating the final stamping foil to a substrate such as plastic at 140 ° C., 20 psi, and 50 mm / min, peeling off the base film, the friction coefficient of the patterned layer was measured by a sliding friction coefficient measuring device. Better wear resistance).

8. Wear resistance measurement

Abrasion resistance was retrofitted by Steinberg, USA. (The longer the wear time, the better the stamping foil.)

Measuring conditions: tip height 0.5 mil, speed 3 m / min, load 50 g

9. Cutting property

The stampability was evaluated after stamping on paper with a down stamper at 100 ° C., 0.4 sec. And 5 kg / cm 2.

Initial Ink Absorption (Grade) Ink Drying Speed (sec) Resolution (μm) Water resistance (grade) Coefficient of friction Wear resistance (minutes) Machinability Example 1 One 232 70 One 0.32 More than 30 Good Example 2 One 255 80 One 0.34 More than 30 Good Comparative Example 1 2 304 100 4 0.30 More than 30 Good Comparative Example 1 2 317 140 3 0.36 28 Good Comparative Example 3 One 220 320 One 0.33 29 Good

As can be seen from the results of Table 1, it can be seen that the transfer stamping foil prepared according to the present invention is excellent in printability and storage durability. Accordingly, the present invention provides a method of manufacturing a transfer / stamping foil having excellent printability and usable for outdoor advertising.

Claims (3)

In the transfer and stamping foils formed by sequentially forming a release layer, a printing layer (pattern layer), a metal deposition layer, and an adhesive layer on a substrate, the printing layer has a glass transition temperature of 50 to 100 ° C. and a hydroxyl group of 10 to 80 (mgKOH / A method for producing a transfer / stamping foil for printing comprising 5 to 55 parts by weight of an acrylic copolymer of gr), 15 to 80 parts by weight of silica having an average particle diameter of 1.0 to 10.0 μm, and 15 to 65 parts by weight of a hydrophilic soluble resin. The method for producing a transfer stamping foil for printing according to claim 1, wherein the acrylic copolymer is composed of acrylic acid or methacrylic acid and their alkyl esters. The method for producing a transfer stamping foil for printing according to claim 1, wherein the hydrophilic soluble resin is polyvinylpyrrolidone resin or a copolymer thereof, polyvinyl alcohol or a copolymer thereof.