KR101265103B1 - Stamping Foil - Google Patents

Abstract

The present invention relates to a stamping foil, and to a stamping foil capable of UV ink printing of various colors on the transferred surface.

Stamping foil, mold release, UV ink, printing

Description

Stamping Foil

The present invention relates to a stamping foil, and more particularly to a stamping foil capable of UV ink printing of various colors on the transferred surface.

Stamping foil is mainly used as a method of transferring a graphic pattern, a character, etc. of a metal component to the to-be-adhered material of various materials, such as a plastic molded article, a leather article, a wooden article, and a paper article.

Stamping foils are also called hot stamp tapes or thermal transfer tapes. The stamping foil has a structure in which a release layer, a coloring layer, a metal deposition layer, and an adhesive layer are sequentially laminated on a base film usually made of a polyester resin.

This stamping foil is used in a hot stamping process in which heat and pressure are transferred using a die of a type to be transferred.

Recently, the technology for securing design clarity is limited to applying various colors to the stamping foil, so the market demands for stamping foil that can print UV inks of various colors on the stamped surface after stamping. Is large. In general, the stamping foil release layer mostly uses a wax-based wax having a low surface energy, so when stamping, a residual amount of wax remains on the stamped surface, and thus, it is difficult to express a desired adhesive force when printing UV ink.

The present invention is to provide a stamping foil having a release layer capable of UV ink printing of various colors on the transferred surface.

Specifically, the object of the present invention is that the release layer has a low adhesive strength with the carrier film base film (PET film) is located on the top layer of the transfer layer after the stamping is possible to print the UV ink, the UV ink adhesion after printing It is intended to provide a good stamping foil.

In the present invention, a release layer, a coloring layer, an aluminum deposition layer, and an adhesive layer are sequentially formed on the base film layer, and among the layers constituting the stamping foil, UV ink printing of various colors on the transferred surface is particularly improved by improving the physical properties of the release layer. It relates to a possible stamping foil. In the present invention, the base film is removed after stamping, and the release layer forms the uppermost layer by adhering the adhesive layer to the substrate surface.

The gist of the present invention compensates for the disadvantages of the wax-based release composition generally used, that is, the remaining amount of the wax after stamping is located on the uppermost layer of the transferred surface, which causes problems in printability and adhesive strength when printing UV ink. In order to achieve a transfer type having a high surface energy and excellent UV ink printability and adhesion to the UV ink, a release layer of a type after the release layer is separated from the base film and moved to the uppermost layer of the transferred surface is formed. It is to provide a stamping foil capable of printing UV ink on the top layer of cotton.

Release agents capable of forming a transfer type release layer include polyurethane-based, acrylic-based and cellulose-based. In the case of acryl-based mold release, UV ink can be printed with a surface energy of about 35mN / m, but it is difficult to apply due to the low adhesion strength with UV ink. The cellulose series has a very high surface energy of 50 mN / m or more, but has little adhesion with other UV inks, so only UV ink can be printed. However, the polyurethane-based surface energy of 40 ~ 55mN / m is quite high, basically the printability of the UV ink, and also excellent adhesion to the UV ink. The polyurethane resin used at this time is characterized in that the elongation at room temperature (25 ℃) is less than 100%. If the elongation exceeds 100%, the cohesive force of the release layer itself is large, and thus the cutting property is poor, so it cannot be used as a stamping foil. The polyurethane resin may be selected from polyurethane, polyether polyurethane, and polycarbonate polyurethane.

The release layer is composed of a polyurethane-based resin and a dilution solvent, and the release composition having a solid content of 0.5 to 3.0% by weight is applied after drying so that the coating amount is 0.03 to 0.15 g / m 2.

At this time, the release layer is coated by the gravure coating method, the mesh of gravure roll is 175 mesh and the dilution solvent used for adjusting the solid content is 4: 6 ~ 6: 4 weight ratio of pure water from which isopropyl alcohol and ions are removed. Do. When coating in the above manner, the solid content of the polyurethane-based release composition is preferably in the range of 0.5 to 3.0% by weight and preferably 0.8 to 1.5% by weight. If the polyurethane content used in the release layer is more than 3% by weight, the cutting property is poor and cannot be used as a stamping foil. If the content is less than 0.5% by weight, the release force is too high, and thus the transferability cannot be achieved due to the failure of the release layer. This problem of deterioration occurs. At this time, if the solid content is 3% by weight, the coating amount after drying is 0.15g / m 2, and if the solid content is 0.5% by weight, the coating amount after drying is 0.03g / m 2.

In the present invention, components other than the release layer may be used without limitation as long as they are components used in the art.

The stamping foil according to the present invention is capable of printing UV ink on the uppermost layer of the transferred surface by introducing a transfer type release layer capable of printing UV ink.

The present invention will be described in detail with reference to the following examples. However, the present invention is not limited to the following examples.

The method of measuring the physical properties is as follows.

(1) Release force evaluation

The Nitto 31B tape was laminated on the adhesive layer of the stamping foil at 25 ° C. and 50% RH using a 5 kg rubber roller, and the sample was cut into a size of 2.54 cm × 18 cm, followed by 60 ° C. at 25 ° C. and 50% RH for 60 minutes. keep it. Using an universal testing machine (INSTRON), the Nitto tape side is clamped to the upper load cell and the polyester film side is clamped to the lower load cell, and then a T-type peel test is performed at a speed of 300 mm / min. When peeled off, the tail that is not bitten by the load cell will remain level until the end of the test.

If the release force ranges from 7gf / 25mm to 2gf / 25mm: Pass

If the release force is outside the range of 7gf / 25mm to 2gf / 25mm: fail

(2) cutting ability

Engraving the letter A on the metal die by size (5mm height-thickness 1mm, 10mm-2mm, 15mm-3mm, 20mm-4mm, 50mm-5mm, 100mm-100mm) and stamping using the stamped die After the foil was transferred to art paper at 120 ° C., 4 kgf, and 0.4 sec., The cutability was evaluated by looking at the similarity between the die shape and the transferred shape.

Same die shape and transferred shape: Pass

Excessive flakes, not transferred to die shapes: fail

(3) Transcription

Engraving the letter A on the metal die by size (5mm height-thickness 1mm, 10mm-2mm, 15mm-3mm, 20mm-4mm, 50mm-5mm, 100mm-100mm) and stamping using the stamped die After the foil was transferred to art paper at 120 ° C., 4 kgf, and 0.4 sec., The transferability was evaluated based on the similarity between the die shape and the transferred shape.

Same die shape and transferred shape: Pass

Excessive flakes, not transferred to die shapes: fail

(4) adhesion to UV ink

UV ink (gelagmelin U0842) is coated on the stamped surface to 1㎛ thickness and cured using UV lamp. After attaching the 3M scotch tape to the UV ink coated surface and left for 1 minute, the scotch tape is removed and the coating layer is peeled off. If the coating layer is not peeled off, the coating layer is passed.

(5) Coating after drying

After preparing 10 samples coated with a release layer on a polyethylene terephthalate film having a thickness of 12㎛, and weighed.

After removing the coating layer using methyl ethyl ketone, and dried in an oven at 100 ℃ for 1 minute and the weight of the film from which the release layer was removed. Using this value, the coating amount after drying per square meter is measured.

(6) Elongation of resin used in release layer

The resin is 2.5 cm wide, 10 cm long, and 1 mm thick. Elongation is measured using a universal testing machine. At this time, the crosshead speed is 300mmm / min.

Example 1

As a base film, a 12-micrometer-thick polyethylene terephthalate film (KOLON, FQ00) was used.

Polyurethane resin (release, WF-41-035, solid content 35%) as a release layer on the base film 1.43% by weight and the remaining solvent was adjusted so that the ratio of isopropyl alcohol: pure water to 5: 5 so that the total solid content is 0.5% by weight and then coated with Gravira 175 mesh. The coating amount after drying of the coating layer was 0.03g / ㎡.

The coating amount after drying to 42.1% by weight of DAP A (Diso), 13.08% by weight of nitrocellulose (Cheist), and 44.76% by weight of block isocyanate (Aekyung Chemical) as a colored layer on top of the release layer. The coating was carried out so as to.

An aluminum deposition layer having a thickness of 600 mW was formed on the colored layer by using a resistance heating method.

30 wt% Cl-PP (Superchlon 773H), 60 wt% acrylic resin (Aekyung Chemical, A-111-50 grade), 10 wt% silica particles (Degussa, Aerosin R200) as an adhesive layer on top of the aluminum deposition layer After mixing, the coating was prepared so that the coating amount was 1.0 g / m 2 after drying.

The physical properties of the prepared stamping foil is measured and shown in Table 1.

[Example 2]

The base film, the coloring layer, the aluminum deposition layer and the adhesive layer were prepared in the same manner as in Example 1, and the polyurethane resin (Stal, WF-41-035, solid content 35%) as the release layer. 2.76 wt% and the remaining solvent was adjusted to a ratio of isopropyl alcohol: pure water of 5: 5 so that the total solid content was 1.0 wt% and coated with Gravira 175 mesh. After drying the coating layer was coated so that the coating amount is 0.05g / ㎡ to prepare a stamping foil.

The physical properties of the prepared stamping foil is measured and shown in Table 1.

[Example 3]

The base film, the coloring layer, the aluminum deposition layer and the adhesive layer were prepared in the same manner as in Example 1, and the polyurethane resin (Stal, WF-41-035, solid content 35%) as the release layer. 8.58% by weight and the remaining solvent was adjusted so that the ratio of isopropyl alcohol: pure water to 5: 5 so that the total solid content is 3.0% by weight, and then coated with Gravira 175 mesh. After drying the coating layer was coated so that the coating amount is 0.15g / ㎡ to prepare a stamping foil.

The physical properties of the prepared stamping foil is measured and shown in Table 1.

Example 4

The base film, the coloring layer, the aluminum deposition layer and the adhesive layer were prepared in the same manner as in Example 1, and the polyurethane resin (Stal, WF-41-035, solid content 35%) as the release layer. 9.09% by weight and the remaining solvent was adjusted so that the ratio of isopropyl alcohol: pure water to 5: 5 so that the total solid content is 3.0% by weight, and then coated with Gravira 175 mesh. After drying the coating layer was coated so that the coating amount is 0.15g / ㎡ to prepare a stamping foil.

The physical properties of the prepared stamping foil is measured and shown in Table 1.

Comparative Example 1

The base film, the coloring layer, the aluminum deposition layer and the adhesive layer were prepared in the same manner as in Example 1, and the polyurethane resin (Stal, WF-41-035, solid content 35%) as the release layer. 0.86% by weight and the remaining solvent was adjusted so that the ratio of isopropyl alcohol: pure water to 5: 5 so that the total solid content is 0.3% by weight, and then coated with Gravira 175 mesh. After drying the coating layer was coated so that the coating amount is 0.02g / ㎡ to prepare a stamping foil.

The physical properties of the prepared stamping foil is measured and shown in Table 1.

Comparative Example 2

The base film, the coloring layer, the aluminum deposition layer and the adhesive layer were prepared in the same manner as in Example 1, and the polyurethane resin (Stal, WF-41-035, solid content 35%) as the release layer. 11.43% by weight and the remaining solvent was adjusted so that the ratio of isopropyl alcohol: pure water to 5: 5 so that the total solid content is 4.0% by weight, and then coated with Gravira 175 mesh. After drying the coating layer was coated so that the coating amount is 0.2g / ㎡ to prepare a stamping foil.

The physical properties of the prepared stamping foil is measured and shown in Table 1.

[Comparative Example 3]

The base film, the coloring layer, the aluminum deposition layer and the adhesive layer were prepared in the same manner as in Example 1, and the acrylic resin (lubrisol, RA17-1 grade, solid content 45%) as the release layer. 2.0 wt%, 0.225% by weight of wax (monst OPtan, 100% solids) and the remaining 99.275% by weight solvent were adjusted so that the ratio of toluene: methylethylketone: xylene was 5: 3: 2 so that the total solid content was 0.725% by weight. The solution heated to 60 ° C. was then coated with gravure 175 mesh. After drying the coating layer was coated so that the coating amount is 0.07g / ㎡ to prepare a stamping foil.

The physical properties of the prepared stamping foil is measured and shown in Table 1.

[Comparative Example 4]

Base film, colored layer, aluminum deposition layer and the adhesive layer was prepared in the same manner as in Example 1, cellulose acetate (Eastman, CA398-3, 100% solids) as a release layer 1.5% by weight and the remaining solvent was adjusted to acetone: cyclohexanone ratio of 3: 7 so that the total solid content is 1.5% by weight and then coated with Gravira 175 mesh. After drying the coating layer was coated so that the coating amount is 0.08g / ㎡ to prepare a stamping foil.

The physical properties of the prepared stamping foil is measured and shown in Table 1.

[Comparative Example 5]

The base film, the coloring layer, the aluminum deposition layer and the adhesive layer were prepared in the same manner as in Example 1, and the polyurethane resin (Stal, SU-10-022, solid content 23%) as the release layer. 13.05% by weight and the remaining solvent was adjusted so that the ratio of isopropyl alcohol: toluene is 5: 5 so that the total solid content is 3.0% by weight, and then coated with Gravira 175 mesh. After drying the coating layer was coated so that the coating amount is 0.15g / ㎡ to prepare a stamping foil.

The physical properties of the prepared stamping foil is measured and shown in Table 1.

[Table 1]

As shown in Table 1, in the case of the embodiment according to the present invention, the release force of the release layer was satisfied, and it was found that the cutting property, the transfer property, and the UV ink adhesion were all excellent. Therefore, it can be seen that UV ink printing after transfer is possible.

Claims (4)

In the stamping foil in which a release layer, a coloring layer, an aluminum deposition layer, an adhesive layer are sequentially formed on the base film layer, The release layer is made of a polyurethane resin having a surface energy of 40 ~ 55mN / m, elongation of 100% or less at room temperature (25 ℃), the stamping layer is located on the top layer of the transfer surface separated from the base film after stamping Stamping foil which can be printed by UV ink. The method of claim 1, The release layer is formed by applying a release composition mixed with a polyurethane-based resin and dilution solvent, stamping foil coated so that the coating composition after drying the release composition having a solid content of 0.5 ~ 3.0% by weight to 0.03 ~ 0.15g / ㎡. 3. The method of claim 2, The polyurethane-based resin is a stamping foil selected from polyurethane, polyether polyurethane, polycarbonate polyurethane. 3. The method of claim 2, The dilution solvent is stamping foil isopropyl alcohol and the weight ratio of the pure water to remove the ionic component 4: 6 ~ 6: 4.