JP6862269B2 - Laminated sheet for thermal transfer and manufacturing method of printed matter using it - Google Patents

Description

The present invention relates to a sheet printed on an object by thermal transfer and a printed matter printed thereby.

Thermal transfer sheets are used for various purposes in which an ink layer is provided on a heat-resistant sheet, the ink layer side is applied to a target, heat is applied, and the printed content is transferred to the surface of the target.

However, it is necessary to heat the heat transfer without fail, and the plastic film or the binder may adhere to the heated body.

For example, Patent Document 1 describes a heat-sensitive transfer sheet used for printing with a thermal head. A transfer ink layer is provided on one surface of a base material of a plastic film, and a protective layer made of a thermoplastic resin binder containing a mold release agent or a lubricant is provided on the other surface. A protective layer of several μm to which a mold release agent and a lubricant is added is formed so that the base plastic does not fuse with the thermal head.

As another form, there is also a method in which an adhesive layer and a release paper are provided on the surface opposite to the plastic film which is the base material on which the ink layer is printed, and the release paper is peeled off to leave the ink layer as a target at the time of thermal transfer. (For example, Patent Document 2 [0020]).

Special Fair 4-59156 Gazette Japanese Unexamined Patent Publication No. 2002-11969

However, when a plastic film such as polyethylene terephthalate (PET) is used as the base material, the base material itself may undergo heat shrinkage during heating, and the printed design may be distorted. A generally used PET film having a thickness of about 8 to 25 μm poses a serious problem. Therefore, it is necessary to use a thick PET film having a thickness of about 100 μm so as not to be heat-shrinked, which causes problems in handling and cost.

As another method, it is conceivable to apply an inorganic sealing material to the surface of a thick paper with high smoothness and coat the surface with a mold release agent to suppress heat shrinkage by the thick paper. .. However, the thick paper coated with the sealing material has a problem in disposability as paper.

Therefore, an object of the present invention is to provide a thermal transfer sheet that can be easily peeled off while ensuring the wasteability of paper and the smoothness of cellophane, eliminating the labor required for printing.

The present invention solves the above-mentioned problems with a laminated sheet for thermal transfer in which paper and cellophane are adhered and a transfer ink layer can be applied to the surface of cellophane.

Since the intermolecular distance of cellophane is as small as several nm, it has the property that solid matter does not easily penetrate between the molecules, so it has excellent peelability, and because it has a hydrophilic group, it is particularly peelable to hydrophobic resins. It can be peeled off from the transfer ink layer that has been heated and transferred to the target due to its own peelability without adding a sealing material, a release agent, a lubricant, or the like.

Using the laminated sheet for thermal transfer according to the present invention, a transfer ink layer in which the content to be transferred to the surface of the cellophane layer is mirror-printed with an ink containing a hot melt binder or a urethane resin, and a hot melt resin layer is provided on the surface layer thereof. Is formed, the surface on the transfer ink layer side is applied to the object to be transferred, the laminated sheet for thermal transfer is heated from the surface of the paper layer, the transfer ink layer is transferred to the object, and the transfer ink layer is transferred by the peelability of the cellophane layer. A method for manufacturing a printed matter can be implemented in which the cellophane layer is peeled off from the ink layer to obtain a printed matter in which only the transfer ink layer is displayed on the surface of the target.

In addition, cellophane can carry out the above procedure only by its own peelability, but by adjusting the content of a softener that is commonly used in the cellophane manufacturing process, the degree of peelability desired. It can be controlled to the peelability suitable for the work site of thermal transfer.

When the laminated sheet for thermal transfer according to the present invention is used, the cellophane layer itself is excellent in peelability, so that it is not necessary to perform a separate mold release process before printing the transfer ink layer, and the printing can be performed as it is, for transfer. It is possible to simplify the procedure for manufacturing the sheet and the printed matter.

Further, since the base material is paper and cellophane, which are hard to shrink, the possibility that the printed contents are distorted during heating can be sufficiently suppressed. Further, the peeled sheet is obtained by adhering paper and cellophane, and since cellophane is made of cellulose, it can be easily disposed of as paper waste when it is disposed of. On the other hand, materials for both paper and cellophane can be easily obtained, and the production itself can be easily performed.

Sectional drawing which shows the example of the laminated sheet which concerns on this invention. Cross-sectional view showing an example of a laminated sheet coated with a thermal transfer ink layer Sectional drawing which shows the relationship between the laminated sheet and an object at the time of thermal transfer by the manufacturing method which concerns on this invention. Cross-sectional view of a printed matter that has been heat-transferred by peeling off the heat-transfer laminated sheet

Hereinafter, the present invention will be described in detail. The present invention is a laminated sheet for thermal transfer used for thermal transfer, and a method for producing a printed matter using the same.

A cross-sectional view of the heat transfer laminated sheet 10 according to the present invention is shown in FIG. The heat transfer laminated sheet 10 is a laminated sheet in which a paper layer 11, a binder layer 12, and a cellophane layer 13 are laminated in this order.

Paper can be used for the paper layer 11. From the viewpoint of strength and heat shrinkage, it is desirable to have a certain thickness. Therefore, the basis weight ^{is preferably 50 g / m 2} or more, and more preferably 70 g / m ² or more. On the other hand, if it is too thick, heat transfer will be poor, the transfer ink layer cannot be transferred cleanly to the target, and handling will be poor in terms of weight, which is not preferable. Therefore, the basis weight ^{is preferably 250 g / m 2} or less, and more preferably 200 g / m ^{2 or less.}

The composition of the above paper is not particularly limited as long as it contains cellulose as a main component. Additives may be added as appropriate depending on the required strength. However, from the viewpoint of disposability, it is desirable not to apply a coating agent or the like except when forming the next binder layer 12. Further, by calendering the surface of the paper used for the paper layer 11 in advance, the surface of the heat transfer ink layer 15 on the cellophane layer 13 side, which will be described later, becomes smoother, and the surface of the finally obtained printed matter becomes glossy. Can be given.

If the paper used for the paper layer 11 is provided with irregularities in advance by embossing or the like, it is possible to form a shape in which the convexity and the concaveness are reversed on the cellophane layer 13 side of the thermal transfer ink layer 15 described later. As a result, the content printed on the surface of the finally obtained printed matter can be made uneven.

The binder layer 12 is an adhesive layer in which the paper layer 11 and the cellophane layer 13 are adhered to each other using an adhesive. Specifically, it may be formed by applying an adhesive to one of the above-mentioned paper and the cellophane described later and attaching the other to the coated surface, or thermoplasticity between the above-mentioned paper and the above-mentioned cellophane. It may be formed by extruding the resin and pressurizing it. Examples of the adhesive include acrylic type, EVA type, urethane type, starch paste and the like. Examples of the coating method include dry laminating, non-solvent laminating, wet laminating, and extruded laminating. As a specific thermoplastic resin, for example, polyethylene can be used, and it is particularly preferable to use low density polyethylene (LDPE). However, since the binder layer 12 must not be peeled off during heating, it is preferable to apply an anchoring agent to the cellophane. Further, a hot melt adhesive having a melting point of 100 degrees or less cannot be used.

Since cellophane itself has excellent peelability, general cellophane can be used for the cellophane layer 13.

Further, when the cellophane contains a softener, the cellophane is less likely to crack and the strength is improved. Further, in order to improve the peelability, it is preferable to appropriately adjust the content of the softener contained in the cellophane. The content of the softener is preferably 1% by mass or more, and more preferably 5% by mass or more. Extremely low fabric softener can cause problems in terms of strength. On the other hand, it is preferably 40% by mass or less, and more preferably 30% by mass or less. If it is too large, it may shift to the heat transfer ink layer 15 and the original hardness may change. It is advisable to adjust so as to meet the required peelability within the above range. In the production of the cellophane sheet, the softener can be contained by regenerating the viscose and then passing it through a softening bathtub after the final washing with water. Further, the softener content can be arbitrarily changed by changing the softener concentration in the softener. Examples of the composition that can be used as a softening agent include glycerin and triethylene glycol.

The thickness of the cellophane sheet is not particularly limited. Since the heat shrinkage of cellophane itself is remarkably smaller than that of PET, even a thin one can be used. Among them, those having a basis weight of 20 g / m ² or more and 70 g / m ² or less can be preferably used. If it is too thin, there is a problem in terms of strength, and there is a high possibility that the paper layer 11 and the cellophane layer 13 will be cut when they are adhered to each other. Further, if it is too thick, it takes time in the process of regenerating viscose and the post-treatment process in the process of producing cellophane, which is disadvantageous in terms of cost.

When transferring the print display to the target by thermal transfer, the contents to be thermally transferred are mirror-printed on the surface of the cellophane layer 13 of the thermal transfer laminated sheet 10 with hot melt binder-containing ink or urethane resin, and hot melt is printed on the surface layer. A printed laminated sheet 20 for heat transfer provided with a heat transfer ink layer 15 provided with a resin layer is used. A cross-sectional view of the printed laminated sheet 20 for thermal transfer is shown in FIG. The hot melt resin layer has a property of adhering to an object to be thermally transferred by applying heat. The type of hot melt used is not particularly limited, but it must have a softening point that can be melted during thermal transfer, which will be described later. For example, polyurethane-based, EVA-based, rubber-based, polyamide-based, and the like can be used.

Using the printed laminated sheet 20 for thermal transfer, the mirror image-printed printed content is thermally transferred to the object 21 to be printed, and the portion corresponding to the laminated sheet 10 for thermal transfer is peeled off to obtain the printed matter 30. Be done. A configuration example for thermal transfer is shown in the cross-sectional view of FIG. 3, and a configuration example for peeling is shown in the cross-sectional view of FIG. At the time of thermal transfer, the printed laminated sheet 20 for thermal transfer is applied to the target 21 with the thermal transfer ink layer 15 facing, and the printed laminated sheet 20 is heated from the paper layer 11 side. As the heat source 25, it is desirable that a heated metal body such as an iron is directly applied to the paper layer 11. The temperature at the time of heating is adjusted within a range where the hot melt-containing ink can be adhered and the printing form of the ink does not change. Further, the temperature of the binder layer 12 needs to be such that it does not soften. This is because if the thermoplastic resin of the binder layer 12 is softened, the cellophane layer 13 and the paper layer 11 may be partially peeled off.

The object 21 to be thermally transferred may be an object having a surface having a certain size. It is desirable that it is smooth, but it can be sufficiently thermally transferred even on a surface such as a cloth. Specifically, it is not particularly limited as long as it is bonded by hot melt, such as cloth, leather, artificial leather, resin molded body, and metal.

Although it depends on the structure of the hot melt-containing ink and the binder layer 12, the basic heating temperature is preferably 100 ° C. or higher, more preferably 120 ° C. or higher. On the other hand, 180 ° C. or lower is preferable, and 150 ° C. or lower is more preferable. The heating time is not particularly limited, and the thermal transfer ink layer 15 may be sufficiently adhered to the target 21.

After heating at an appropriate temperature and time, the heat source 25 is separated, and the portion of the original heat transfer laminated sheet 10 is peeled off from the target 21. At this time, the peelability of the cellophane layer 13 is sufficiently exhibited, so that the peeling between the heat transfer ink layer 15 and the cellophane layer 13 proceeds suitably. When the peeling is completed, a printed matter is obtained in which the heat transfer ink layer 15 thermally transferred to the surface of the object 21 is displayed as a pattern in which the mirror image is reversed.

Next, the present invention will be specifically shown with reference to examples.

(Example 1)
^{30 g / m 2} cellophane (manufactured by Rengo Co., Ltd.) containing 12% by mass of glycerin and a two-component curable urethane resin (manufactured by Mitsui Chemicals, Inc .: Takenate A-242A, Takelac A-244B) 1.5 g / m ² is coated with a non-solvent coater to form a binder layer, and 160 g / m ² base paper for liner (manufactured by Rengo Co., Ltd.) is bonded to the coated surface to obtain a laminated sheet for thermal transfer. It was. Then, 40 g / m ² of polyurethane resin (manufactured by Dainippon Ink and Chemicals Co., Ltd .: CRISVON S-125) is applied to the cellophane surface to provide a heat transfer ink layer, and the heat transfer ink layer is applied to the polyester fabric. After heat-pressing at 130 ° C. for 3 seconds from the paper layer side and cooling at room temperature, a 15 mm wide laminated sheet for thermal transfer and polyester fabric are combined with Tencilon Universal Testing Machine (RTG-1210 manufactured by A & D Co., Ltd.). The ink was pulled in the direction of 180 ° C. at a speed of 100 mm / min, and the peel strength was measured and the transfer state of the thermal transfer ink layer was visually observed.

(Example 2)
In Example 1, 65 g / m ² copy paper (manufactured by Rengo Co., Ltd.) was used instead of the 160 g / m ^{2 liner base paper, and 20 g / m 2} cellophane containing 1% by mass of glycerin was used. Obtained a laminated sheet for thermal transfer in the same manner as in Example 1.

(Example 3)
In Example 1, 230 g / m ² liner base paper (manufactured by Rengo Co., Ltd.) was used ^{instead of 160 g / m 2 liner base paper, and 60 g / m 2} cellophane containing 40% by mass of glycerin was used. A laminated sheet for thermal transfer was obtained in the same manner as in Example 1 except for the above.

(Example 4)
^{In Example 1, instead of 1.5 g / m 2} of a two-component curable urethane resin, polyethylene (manufactured by Sumitomo Chemical Co., Ltd .: Sumikasen L705) is ^{extruded to 20 g / m 2} with an extrusion coater for cellophane and liner. A laminated sheet for thermal transfer was obtained in the same manner as in Example 1 except that the base paper was laminated and EVA-based thermal transfer ink (manufactured by Art Deco Heat Transfer Materials Co., Ltd .: ADg-GLPV0) was used instead of the polyurethane-based thermal transfer ink. It was.

( Reference example 1 )
In Example 1, a laminated sheet for thermal transfer was obtained in the same manner as in Example 1 except that cellophane without glycerin was used instead of ^{30 g / m 2} cellophane containing 12% by mass of glycerin.

(Example 5 )
A laminated sheet for thermal transfer was obtained in the same manner as in Example 1 except ^{that 40 g / m 2} thin leaf printing paper was used instead of the 160 g / m ² base paper for the liner of Example 1.

(Example 6 )
A laminated sheet for thermal transfer was obtained in the same manner as in Example 1 except that 280 g / m ² white paperboard was used instead of the 160 g / m ^{2 liner base paper of Example 1.}

(Example 7 )
A laminated sheet for thermal transfer was obtained in the same manner as in Example 1 except that cellophane containing 45% by mass of glycerin was used instead of ^{30 g / m 2} of cellophane containing 12% by mass of glycerin in Example 1.

(Example 8 )
A laminated sheet for thermal transfer was obtained in the same manner as in Example 1 except that 17 g / m ² cellophane was used instead of 30 g / m ^{2 cellophane in Example 1.}

(Example 9 )
A laminated sheet for thermal transfer was obtained in the same manner as in Example 1 except that 75 g / m ² cellophane was used instead of 30 g / m ^{2 cellophane in Example 1.}

(Comparative Example 1)
A laminated sheet for thermal transfer was obtained in the same manner as in Example 1 except that a 34 g / m ² polyethylene terephthalate film was used instead of the 160 g / m ^{2 liner base paper in Example 1.}

(Comparative Example 2)
^{A 136 g / m 2} polyethylene terephthalate film was used instead of the heat transfer laminated sheet of Example 1 to obtain a heat transfer laminated sheet.

(Comparative Example 3)
A laminated sheet for thermal transfer was obtained in the same manner as in Comparative Example 1 except that a 90 g / m ² biaxially stretched polypropylene film was used instead of the 34 g / m ^{2 polyethylene terephthalate film of Comparative Example 1.}

(Comparative Example 4)
A laminated sheet for thermal transfer was obtained in the same manner as in Comparative Example 2 except that EVA-based thermal transfer ink was used instead of the polyurethane-based thermal transfer ink of Comparative Example 2.

<Evaluation method: Peelability>
For each example, the peel strength was measured according to JIS K6854. The results are shown in Table 1. ◎ for each value less than 10 gf / 15 mm, ○ for 10 gf / 15 mm or more and less than 13 gf / 15 mm, △ for 13 gf / 15 mm or more and less than 15 gf / 15 mm, 15 gf / 15 mm or more It was marked as x.

<Evaluation method: Shrinkage>
For each example, a 30 cm square test piece was left in an environment of 130 ° C. for 10 seconds, and the value of contraction at that time converted to 100 cm was 1 mm or less. Those with a value of ◯ were marked with ◯, those with a thickness of more than 3 mm and 5 mm or less were marked with Δ, and those with a value of more than 5 mm were marked with x. The evaluation results are shown in Table 1.

<Evaluation method: Handling>
Using the heat transfer laminated sheets of each example, a plurality of prints actually heat-transferred were produced. When handling the sheet during the thermal transfer of each example, regarding defects such as wrinkles, breaks, and kerning, those that do not require attention are ◎, those that require almost no attention are ○, and those that can be thermally transferred if handled with care. Was marked with Δ, and those with difficult or impossible thermal transfer were marked with ×.

10 Laminated sheet for thermal transfer 11 Paper layer 12 Binder layer 13 Cellophane layer 15 Thermal transfer ink layer 20 Laminated sheet for thermal transfer that has been printed 21 Target 25 Heat source 30 Printed matter

Claims (3)

A paper layer that is paper, a binder layer that is an adhesive, and a cellophane layer that is cellophane having 1% by mass or more and 40% by mass or less of glycerin are laminated in this order in order to transfer a printed display to a target by thermal transfer. Laminated sheet for thermal transfer used for. The surface layer having the heat transfer laminated sheet according to claim 1 and having a hot melt binder-containing ink mirror-printed on the surface of the cellophane layer or a non-heat-melted resin mirror-printed on the surface. A printed laminated sheet for thermal transfer having a thermal transfer ink layer provided with a hot melt resin layer. Using the laminated sheet for thermal transfer according to claim 1,
A heat transfer ink layer provided by mirror-printing a hot-melt binder-containing ink on the surface of the cellophane layer or a heat-transfer ink layer provided by mirror-printing a non-heat-melted resin and provided with a hot-melt resin layer on the surface has been printed. Manufactures laminated sheets for thermal transfer
The printed laminated sheet for thermal transfer is applied to the object to be transferred from the thermal transfer ink layer side.
The printed laminated sheet for thermal transfer is heated from the paper layer side to adhere the thermal transfer ink layer to the target.
The laminated sheet for thermal transfer is peeled off between the thermal transfer ink layer and the cellophane layer to obtain a printed matter in which the thermal transfer ink layer is displayed on the surface of the target.
Manufacturing method of printed matter.

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