KR20080103750A - Transfer sheet to prevent scrap - Google Patents

Abstract

A scrap generating prevention transcription sheet is provided, which is adhered to the cross section adhesive and does not easily fall down even though a peeling layer easily breaks or a partial peeling layer is broken. In a transcription sheet that a releasing layer(12), a peeling layer(13) and a glue layer(15) are successively laminated on one side of the substrate sheet(10): a cross section glue layer(18) is partly formed between the releasing layer and the peeling layer; a cross section glue layer partly formed between the releasing layer and the peeling layer is formed of a cut region(17) and prevents generation of particle when being cut; the width of the cross section glue layer is 5 ~ 15mm; and an easiness adhesion transaction layer is formed between the substrate sheet and the releasing layer and a pattern layer is formed between the peeling layer and the glue layer.

Description

Transfer Sheet to Prevent Scrap}

1 is a cross-sectional view of a conventional transfer sheet

2 to 6 are cross-sectional views of the transfer sheet according to the present invention.

* Explanation of symbols for the main parts of the drawings

10: base sheet 11: easy adhesive treatment layer

12: release layer 13: release layer

14: pattern layer 15: adhesive layer

17: Slitting site 18: Cutting surface adhesive layer

19: anchor layer

The present invention relates to a transfer sheet used for the surface decoration of a transfer object such as a synthetic resin molded article. Conventionally, as a method of decorating a surface of a synthetic resin molded product, a simultaneous molding process for inserting a transfer sheet having a release layer, a peeling layer, a pattern layer, and an adhesive layer formed on a base sheet into a mold and molding a synthetic resin molded product has been widely used. . The transfer sheet used in the molding simultaneous transfer method is called a 'molding simultaneous transfer sheet'. For example, the molding simultaneous transfer sheet is inserted into the mold so that the adhesive layer is located in the direction of ejection, but in a molten state. The injection molded product and the adhesive layer of the transfer sheet are inserted into contact with each other, followed by injection molding. Then, the base sheet of the transfer sheet is peeled (released) from the injection molded product. A molded product is obtained and the base sheet and the release layer fall off.

In general, the transfer sheet used for the transfer is produced by the same width as the roll width of the printing machine in consideration of productivity and printing convenience because each layer is laminated (printed) by a printing method. Therefore, since the width of the roll of the printing machine is usually 1200 mm or more, when using the manufactured transfer sheet, a cutting operation (slitting) is necessary to cut the width appropriately in accordance with the size of the transfer object.

The transfer sheet used in the simultaneous molding method is usually formed with a release layer coated on the entire surface of one side of the base sheet and a release layer and an adhesive layer coated on the release layer. However, since the release layer is a composition that forms the outer surface of the synthetic resin molded product, high hardness is generally required. Accordingly, ultraviolet release (UV) curable resins or electron beam curable resins are commonly used as the release layer. On the other hand, a wide sheet transfer sheet is inevitably slitted to an appropriate width, and a problem arises that the peeling layer is finely broken at the cutting surface during cutting. Scraping due to the fine peeling of the release layer may occur only when the release layer is thick, such as a hard-coated transfer sheet, or when the thickness of the transfer layer is thick due to the large number of functional layers such as a paint layer. It is known.

Such finely divided scraps are attached to the transfer sheet to contaminate the transfer sheet, and also have a problem of causing defects in the synthetic resin molded product by being buried in a mold during molding.

The present invention is to solve the problems of the conventional transfer sheet as described above is to provide a transfer sheet and a method of manufacturing the same that can prevent the generation of debris during cutting.

In another aspect, the present invention, the transfer sheet is laminated to the release layer, the release layer and the adhesive layer on one side of the base sheet in turn, and further forms a partially cut surface adhesive layer between the release layer and the release layer to prevent the occurrence of fragments during cutting It is to provide a transfer sheet and a method of manufacturing the same that can be prevented.

The transfer sheet of the present invention is a base sheet and a transfer sheet in which a release layer, a peeling layer, and an adhesive layer are sequentially laminated on one side of the base sheet, wherein a partially cut surface adhesive layer is further formed between the release layer and the release layer. It features.

The transfer sheet according to the present invention may be a pattern layer, an anchor layer, an antistatic layer, or any other conventionally known functional layers such as an easy adhesion treatment layer for treating the release layer to be easily adhered (attached) to a base sheet. One or more functional layers selected may be further formed.

The transfer sheet according to the present invention is peeled off because the cut surface adhesive layer formed further between the release layer and the peeling layer is a cut portion, and is cut along the cut surface adhesive layer when cut to an appropriate width in accordance with the size of the transfer object. It is possible to prevent the crushing of the layer, that is, the occurrence of scrap (scrap) phenomenon.

The transfer sheet according to the present invention can be used in various ways to decorate the surface of the transfer body, such as a synthetic resin molded article. For example, the transfer sheet according to the present invention is a conventional transfer method such as a transfer method using a roll transfer machine or an updown transfer machine having a heat-resistant rubber-like elastic body as well as a molding simultaneous transfer method including injection molding. The surface of the to-be-transferred body can be decorated by the method. In particular, it can be usefully applied as an injection molding simultaneous transfer sheet.

Hereinafter, a preferred configuration of the transfer sheet of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a cross-sectional view of a laminated structure in which a base sheet 10, a release layer 12, a release layer 13, and an adhesive layer 15 are sequentially formed as a cross-sectional view of a conventional transfer sheet.

2 is a cross-sectional view of the transfer sheet according to the present invention, the base sheet 10 and the release layer 12 are sequentially stacked, and the cut surface adhesive layer 18 is partially laminated on the release layer 12, and the cut surface The cross section of the laminated structure in which the peeling layer 13 and the adhesive bond layer 15 were formed in order on the adhesive bond layer 18 and the release layer 12 is shown. FIG. 3 is a cross-sectional view of a laminated structure in which the easy adhesion treatment layer 11 is further formed between the base sheet 10 and the release layer 12 on the transfer sheet of FIG. 2, and FIG. 4 is a pattern layer on the transfer sheet of FIG. 14 is a cross-sectional view of the laminated structure further formed between the release layer 13 and the adhesive layer 15, and FIG. 5 shows that the anchor layer 19 is formed on the transfer sheet of FIG. A cross-sectional view of the laminate structure further formed between the layers 14 is shown.

The base sheet 10 of the transfer sheet according to the present invention is a film (sheet) such as polyethylene-based, acrylic-based, polyvinyl chloride-based, polypropylene-based, polyester-based, polyamide-based, or copolymer thereof such as polyethylene terephthalate resin. Films (sheets) or metal sheets (foils) such as aluminum and copper, films (sheets) such as cellophane can be used, but synthetic resin films (sheets) having good elasticity and moldability are preferred. Polyethylene terephthalate (PET), which has excellent thermal stability, is preferable because it requires several steps of printing (lamination) or coating. The thickness is 25 to 50 micrometers in consideration of the curvature of the transfer object or the flexibility in the mold. (um) range is suitable.

The release layer 12 is a layer that is released from the release layer 13 together with the base sheet 10 when the base sheet 10 is peeled off after transfer, so that the release layer 12 is easily peeled off on the release layer 13 and the base sheet 10. Form. As the material of the release layer 12, a silicone resin, an epoxy resin, a melamine resin, a fluorine resin, or the like can be used. As a formation method of a release layer, it can coat uniformly by the microgravure coating method, the lip coating method, etc.

The cut surface adhesive layer 18 of the transfer sheet according to the present invention is partially formed on the release layer 12 in a band-shaped pattern. That is, one or more strip-shaped patterns are formed in parallel with the length and / or the width direction of the base sheet 10. Since the cut surface adhesive layer 18 is a portion for slitting the transfer sheet, the width of the cut adhesive layer 18 is preferably about 5 to 15 mm (mm). The cut surface adhesive layer 18 of the transfer sheet according to the present invention remains attached (glued) on the release layer 13 when the base sheet 10 is peeled off after the transfer. The cut surface adhesive layer 18 of this invention can be formed by the same material and formation method as the adhesive bond layer 15 mentioned later.

Since the release layer 13 forms the outermost layer of the molded article after the transfer, the release layer 13 should be resistant to external wear, friction and scratches. Therefore, the peeling layer 13 requires a high hardness characteristic. In addition, the transfer sheet should be free from problems such as cracks in the bent portion when transferring to the transfer body having various curved surfaces and molding in the mold. Examples of the resin that meets these characteristics include ultraviolet or electron beam curable resins and thermosetting resins. The release layer forming resin can be used by adding a pigment or dye and coloring it as necessary. The curing method of the release layer-forming resin is a one cure method that is completely cured after coating on the release layer 12 and a partial curing after the coating (generally not fully cured), followed by irradiation with ultraviolet (UV) light again after molding. The dual cure method can be used to fully cure. The coating method of the release layer may be a comma coat, a roll coat, a microgravure coat, a lip coat method or the like.

The adhesive layer 15 of the transfer sheet is a transfer surface for forming an adhesive surface which directly contacts an injection product flowing in a molten state during molding of a synthetic resin product, for example, to improve adhesion between the transfer surface and the injection resin. It is a layer for. This adhesive layer is usually applied by diluting a hot melt adhesive to a dilute solvent and applying a conventional coating method such as a roll coating method, a comma coating method, a gravure coating method, a lip coating method, a gravure printing method, a screen printing method, etc. It can be formed by the printing method of. The hot melt adhesive may be used by selecting a suitable thermosensitive or pressure-sensitive synthetic resin according to the material of the adhered material to be molded.

In the transfer sheet according to the present invention, the easy adhesion treatment layer 12 may be formed on the base sheet. The easy adhesion treatment layer 12 is a functional layer for easily releasing (attaching) a release layer to the base sheet, thereby improving the adhesiveness of the release agent by treating one side of the base sheet in a known manner such as corona treatment. You can.

In the transfer sheet according to the present invention, a pattern layer 14 may be formed on the release layer 13. The patterned layer 14 may be formed on the entire surface or a part of the release layer as a part for forming a pattern on a transfer body such as a synthetic resin product after transfer, and may be formed by conventional printing pattern and metal deposition formed by ink printing. It may be formed of a metal pattern to be formed. As a method of forming a printed pattern, it can be formed by a conventional printing method such as a gravure printing method, a screen printing method or an offset printing method. In the case of multicolor printing, an offset printing method or a gravure printing method is suitable. In this case, a coating method such as a gravure coating method, a roll coating method, a comma coating method, or the like is suitable. In the case of metal deposition, metals such as aluminum, nickel, don, platinum, chromium, iron and titanium can be used to express the color of the metal, and the thickness is usually about 40 to 60 nm. When partially forming the metal deposition layer, the surface other than the portion to be deposited is first coated with a water-soluble coating, followed by deposition. If the water-soluble coating layer is washed off with an alcohol / water mixed solvent, deposition can be carried out at exactly the desired portion. . The adhesive layer 15 may not be formed if the pattern layer 14 has sufficiently strong adhesive force with the synthetic resin to be transferred.

The anchor layer 19 may be further formed as a functional layer for improving the adhesion between the release layer and the pattern layer and / or a functional layer for improving the adhesion between the pattern layer and the adhesive layer.

The transfer sheet according to the present invention may further be formed of conventionally known functional layers such as an antistatic layer.

Transfer sheet according to the present invention comprises the steps of preparing a raw material including a base sheet; Coating a release agent on one side of the base sheet to form a release layer; Partially coating an adhesive on the release layer to form a cut surface adhesive layer; Forming a release layer by coating a synthetic resin on the partially formed cut surface adhesive layer and the release layer; The adhesive may be coated on the release layer to form an adhesive layer, which in turn may be manufactured.

The manufacturing method of the transfer sheet according to the present invention comprises an easy adhesive treatment step of treating the interposition sheet by a method such as corona treatment so that the release agent is easily adhered before the release layer forming step; Forming a patterned layer by printing or depositing a metal on the release layer before the adhesive layer forming step; Forming an anchor layer by coating an anchor agent on the release layer before the pattern layer forming step or before the adhesive layer forming step; It may further include any one or more steps selected from.

The transfer sheet according to the present invention as described above can decorate the surface of the various kinds of the transfer body in a variety of patterns and colors. For example, the present invention can be applied to various products and shapes such as injection molded articles, extruded molded articles, press molded articles, flat plates, curved plates, rod-shaped articles such as synthetic resin molded products, metal products, wood products, and ceramic products.

Example 1

A polyester film (made by Japan Lintec) having a thickness of 38 μm and a width of 1200 mm having a release layer formed thereon was prepared as a base film. When cutting using the acrylic resin on the release layer of the base film (slit), the cut surface adhesive layer corresponding to the cut surface portion was formed in four strips with a thickness of 1um by a microgravure printing method in a strip shape of 10mm width. A release layer (reference numeral 13) was formed on the release agent layer on which the cut surface adhesive layer and the cut surface adhesive layer were not formed. The release layer was coated with UV curable resin by microgravure coating and dried, and cured with a metal halide lamp of 0.558 J / cm 2 to form a layer having a thickness of 5 um. The UV resin was mainly composed of a urethane oligomer having an isocyanate functional group and a hydroxyl acrylate resin.

Finally, the adhesive layer was gravure coated with a hot-melt adhesive to form a thickness of 3um, thereby preparing a transfer sheet according to the present invention.

As a result of observing the cut surface and the periphery of the release layer while cutting (slit) the prepared transfer sheet with a slit along the cut surface adhesive layer, there was almost no debris or occurrence of debris on the cut surface. Was confirmed to adhere to the cut surface adhesive.

 Example 2

A transfer sheet was manufactured in the same manner as in Example 1, except that the printed pattern layer was formed to a thickness of 2 μm by the gravure printing method on the cured release layer of Example 1.

As a result of observing the cut surface and the surroundings of the peeling layer while cutting (slit) the manufactured transfer sheet with a slitting along the cut adhesive layer, there was little chipping or debris at the cut surface, and some of the debris was formed on the cut adhesive. It could be confirmed that it is attached.

Comparative Example 1

A 38 um thick polyester film (manufactured by Japan Lintec) having a release layer was used as the base film. A release layer was formed on the release agent layer of the base film.

The release layer was coated with UV curable resin by microgravure coating and dried, and cured with a metal halide lamp of 0.558 J / cm 2 to form a layer having a thickness of 5 um. The UV resin was mainly composed of a urethane oligomer having an isocyanate functional group and a hydroxyl acrylate resin. Finally, the adhesive layer was gravure coated with a hot-melt adhesive to prepare a transfer sheet formed to a thickness of 3um.

As a result of observing the cut surface and the surroundings while cutting (slit) the manufactured transfer sheet with a slitter, it was confirmed that the peeling layer was broken at the cut surface to generate large and small fragments.

The transfer sheet according to the present invention has the effect of preventing the generation of debris due to the fragmentation of the peeling layer during the slitting to the desired width after the production, or contaminating the transfer sheet accordingly. That is, even if the peeling layer is easily broken by the cut surface adhesive or some peeling layer is broken, it is attached to the cut surface adhesive and does not easily fall off.

Claims (9)

A transfer sheet in which a release agent layer, a release layer, and an adhesive layer are sequentially laminated on one side of a base sheet and the base sheet, wherein a cut surface adhesive layer is further partially formed between the release agent layer and the release layer. The transfer sheet according to claim 1, wherein the cut surface adhesive layer has a width of 5 to 15 mm. The transfer sheet according to claim 1, further comprising an easy adhesion treatment layer formed between the base sheet and the release layer. The transfer sheet according to claim 1, wherein a pattern layer is further formed between the release layer and the adhesive layer. The transfer sheet according to claim 4, wherein an anchor layer is further formed between the release layer and the pattern layer or between the pattern layer and the adhesive layer. The transfer sheet according to claim 4, wherein an anchor layer is further formed between the release layer, the pattern layer, and the pattern layer and the adhesive layer. The transfer sheet according to any one of claims 1 to 6, wherein the transfer sheet is a molded co-transfer sheet. Preparing a raw material including a base sheet; Coating a release agent on one side of the base sheet to form a release layer; Partially coating an adhesive on the release layer to form a cut surface adhesive layer; Forming a release layer by coating a synthetic resin on the partially formed cut surface adhesive layer and the release layer; A method of manufacturing a transfer sheet according to any one of claims 1 to 7, characterized in that the step of coating an adhesive on the release layer to form an adhesive layer. According to claim 8, Easy adhesive treatment step of processing the interposition sheet so that the release agent is easily adhered to the base sheet before the release layer forming step; Forming a patterned layer by printing or depositing a metal on the release layer before the adhesive layer forming step; Forming an anchor layer by coating an anchor agent on the release layer before the pattern layer forming step or before the adhesive layer forming step; A method for producing a transfer sheet according to any one of claims 1 to 7, further comprising any one or more steps selected from.

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