JP2017177783A - Thermal transfer image receiving sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal transfer image receiving sheet using coat paper as a base material, the thermal transfer image receiving sheet capable of preventing malfunction such as paper jam, printing failure and noise inside a printer, as well as having excellent cutting properties.SOLUTION: A thermal transfer image receiving sheet has a reception layer on a base material. The thermal transfer image receiving sheet has perforation allowing cutting-off. The base material is coat paper. The proportion of the length of one cut part forming the perforation is 47% or more and 55% or less with regard to the sum of the length of the one cut part and the length of one uncut part neighboring the cut part. The length of the one uncut part is longer than 0.23 mm.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a thermal transfer image receiving sheet.

  2. Description of the Related Art Conventionally, thermal transfer printing has been performed in which a thermal transfer sheet and a thermal transfer image receiving sheet are superimposed and a color material on the thermal transfer sheet is transferred to the thermal transfer image receiving sheet. The image obtained by the thermal transfer printing is excellent in halftone reproducibility and gradation, and is extremely high in definition, and therefore, the demand is increasing compared to a full-color silver salt photograph.

  In a thermal transfer image receiving sheet used for such a thermal transfer type printing, as disclosed in Patent Document 1, there are cases where a detachable perforation is provided. By providing a perforation on the thermal transfer image-receiving sheet, it can be cut off along the perforation after printing, so that, for example, a print product having no border can be obtained.

Japanese Patent Laid-Open No. 2002-274061

  However, when a thermal transfer image-receiving sheet provided with perforations is used, there is a possibility that “float” occurs in the part separated by the perforations inside the printer, resulting in problems such as paper jams, printing defects, and abnormal sounds. It was. Even when the perforation portion is accidentally cut off inside the printer, problems such as paper jams, printing defects, and abnormal noises occur as in the case where the “floating” occurs.

  In addition, when performing separation along the perforation after printing is completed, some users may perform separation without folding back the perforation part. There was a case where the portion other than the perforation was torn due to insufficient properties.

  Further, various materials are used as the base material of the thermal transfer image receiving sheet, but the demand for coated paper is increasing because it is inexpensive. However, an optimal perforation for a thermal transfer image receiving sheet in which coated paper is used as a base material has not yet been developed, and a perforation similar to that of a thermal transfer image receiving sheet in which other materials are used as a base material has been formed. In some cases, the above-mentioned “floating” may occur or the cutting performance may be insufficient.

  The present invention has been made under such circumstances, and is a thermal transfer image-receiving sheet in which coated paper is used as a base material. In the printer, there are problems such as paper jams, printing defects, and abnormal noise. It is a main object to provide a thermal transfer image-receiving sheet that can be suppressed from being generated and has excellent cutting performance.

  The present invention for solving the above problems is a thermal transfer image receiving sheet provided with a receiving layer on a substrate, the thermal transfer image receiving sheet being provided with a detachable perforation, and the substrate is coated paper The ratio of the length of one cut portion to the sum of the length of one cut portion constituting the perforation and the length of one uncut portion adjacent to the cut portion is 47% or more and 55% or less And the length of the one uncut portion is longer than 0.23 mm.

  According to the thermal transfer image-receiving sheet of the present invention, “floating” does not occur inside the printer or is not cut off inside the printer, and the occurrence of problems such as paper jams, printing defects, and abnormal noise is suppressed. be able to. On the other hand, in the case of separating at an appropriate timing, the portion can be easily separated without bending the perforated portion.

The perspective view of the thermal transfer image receiving sheet concerning embodiment of this invention. The enlarged front view of the perforation of the thermal transfer image receiving sheet shown in FIG.

  Hereinafter, a thermal transfer image receiving sheet according to an embodiment of the present invention will be described with reference to the drawings. In the drawings, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product.

  FIG. 1 is a perspective view of a thermal transfer image receiving sheet according to an embodiment of the present invention.

  As shown in FIG. 1, a thermal transfer image receiving sheet 10 according to an embodiment of the present invention includes a receiving layer 2 on a substrate 1, and is provided with a detachable perforation 3. Hereinafter, each configuration of the thermal transfer image receiving sheet 10 will be described.

(Base material)
The substrate 1 constituting the thermal transfer image receiving sheet 10 according to the present embodiment includes coated paper. Here, coated paper refers to coated paper that is generally manufactured and sold, and refers to paper that is coated with about 20 g / m ² of clay on the surface of upper / medium quality paper. Here, the thickness of the coated paper is not particularly limited, but is preferably about 165 μm or more and 185 μm or less, and more preferably about 170 μm or more and 180 μm or less.

  The base material 1 constituting the thermal transfer image-receiving sheet 10 does not necessarily have a single-layer structure made of only coated paper, and is a laminated structure in which the coated paper described above and another material are bonded together via an adhesive layer. It may be. When the base material 1 has a laminated structure, a coated paper is used as a core material, and an adhesive layer is used to bond a cushioning bonding material such as a film having voids (microvoids) inside. Thus, the substrate 1 can be obtained. In this case, the bonding material may be bonded to one side of the coated paper serving as the core material, or the bonding material may be bonded to both sides of the coated paper serving as the core material. Also, the bonding method is not particularly limited, and known methods such as dry lamination, wet lamination, non-solvent lamination, EC lamination, and heat sealing can be used. The adhesive layer may be applied to the coated paper side that is the core material, or may be applied to the bonding material side, but in order to effectively erase the texture of the coated paper, It is preferable to apply to. Further, easy adhesion treatment such as corona discharge treatment may be performed on one or both of the front surface and the back surface of the substrate 1.

  The adhesive layer used when the base material 1 has a laminated structure is not particularly limited, and a conventionally known adhesive layer can be appropriately employed. For example, as the adhesive constituting the adhesive layer, urethane resin, polyolefin resin such as α-olefin-maleic anhydride resin, polyester resin, acrylic resin, epoxy resin, urea resin, melamine Resins, phenol resins, vinyl acetate resins, cyanoacrylate resins, and the like can be used. Among them, a reactive type of acrylic resin or a modified one can be preferably used. Further, it is preferable to cure the adhesive using a curing agent since the adhesive force is improved and the heat resistance is also increased. As the curing agent, an isocyanate compound is generally used, but aliphatic amines, cycloaliphatic amines, aromatic amines, acid anhydrides and the like can be used. For the formation of the adhesive layer, it is possible to use a commonly applied coating means, for example, by a gravure printing method, a screen printing method, a reverse roll coating method using a gravure plate, and the like, Then, the adhesive layer can be formed by drying.

  As described above, the thickness of the entire base material 1 when the base material 1 has a laminated structure including coated paper is not particularly limited, but is preferably about 200 μm to 230 μm, for example, 204 μm or more. More preferably, it is about 224 μm or less.

(Receptive layer)
The receiving layer 2 constituting the thermal transfer image receiving sheet 10 is not particularly limited, and can be appropriately selected from conventionally known various receiving layers. For example, the receiving layer 2 is constituted by adding various additives such as a release agent to a varnish mainly composed of a resin that easily transfers or dyes a coloring material. Examples of resins that are easily dyed include acrylic resins, polyolefin resins such as polypropylene, halogenated resins such as polyvinyl chloride and polyvinylidene chloride, vinyl resins such as polyvinyl acetate and polyacrylate, and copolymers thereof, Examples include polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polystyrene resins, polyamide resins, copolymers of olefins such as ethylene and propylene, and other vinyl monomers, ionomers, cellulose derivatives alone, or mixtures. Among these, vinyl chloride-vinyl acetate copolymer resin and acrylic resin are preferable.

The receiving layer 2 can also contain a release agent in order to prevent thermal fusion with the thermal transfer sheet during image formation. As the release agent, silicone oil, phosphate plasticizer, and fluorine compound can be used. Among these, silicone oil is preferably used. The amount of release agent added is preferably 0.2 parts by mass or more and 30 parts by mass or less with respect to the receiving layer forming resin. The release agent may be added to the receiving layer 2 as described above, but may be separately formed on the surface of the receiving layer 2 using the above-described material. In the receiving layer 2, you may add a fluorescent whitening agent and other additives as needed. The receiving layer is applied by a general method such as roll coating, bar coating, gravure coating, or gravure reverse coating. The coating amount is preferably 0.5 g / m ² or more and 10 g / m ² or less (in terms of solid content).

(Perforation)
FIG. 2 is an enlarged front view of the perforation of the thermal transfer image receiving sheet shown in FIG.

  The thermal transfer image receiving sheet 10 according to the embodiment of the present invention is provided with a detachable perforation 3. As shown in FIGS. 1 and 2, the perforation 3 includes a cut portion 3a as a through-hole penetrating from one surface of the thermal transfer image receiving sheet 10 to the other surface, and an uncut portion 3b other than the cut portion. It is configured.

  As shown in FIG. 2, the perforation 3 in the thermal transfer image receiving sheet 10 according to the present embodiment includes a length x of one cut portion 3 a constituting the perforation 3 and one adjacent to the cut portion 3 a. The ratio (x / (x + y)) of the length x of the one cut portion 3a to the sum (x + y) of the length y of the uncut portion 3b is 47% or more and 55% or less, and the one uncut It is characterized in that the length y of the portion 3b is longer than 0.23 mm. The inventor of the present application finds not only the length of the cut portion 3a and the uncut portion 3b but also the proportion thereof, in other words, the balance between the cut portion 3a and the uncut portion 3b, and optimizes the proportion. By doing so, there is no “floating” inside the printer or separation inside the printer, and it is possible to suppress the occurrence of problems such as paper jams, printing defects, and abnormal noises. In the case of separation at an appropriate timing, it becomes possible to easily separate the portion without bending the perforated portion.

  Here, the upper limit of the length y of the uncut portion 3b can be arbitrarily designed as long as it can actually function as a perforation, but is preferably set to 0.35 mm or less, preferably 0.31 mm or less. It is preferable to do.

  The method for forming the perforation 3 having such characteristics is not particularly limited. For example, the perforation 3 may be formed by a conventionally known method using a blade having a blade angle of about 20 ° to 60 °.

(Other configurations)
In the thermal transfer image receiving sheet 10 according to the embodiment of the present invention, the configuration other than the base material 1, the receiving layer 2, and the perforation 3 is not particularly limited, and has other configurations. Also good.

  For example, an intermediate layer is provided between the base material 1 and the receiving layer 2 in order to exhibit various performances such as solvent resistance performance, barrier performance, adhesion performance, white color imparting performance, hiding performance, cushion performance, and antistatic performance. In this case, a variety of conventionally known intermediate layers can be selected and used. Moreover, the primer layer for improving adhesiveness may be provided in the surface or the back surface of the base material 1. FIG. Furthermore, a back surface layer may be provided on the back surface of the substrate 1, that is, on the surface on which the receiving layer 2 is not provided in order to improve the transportability of the thermal transfer image receiving sheet 10 and prevent curling.

  Examples and comparative examples of the thermal transfer image receiving sheet of the present invention are shown below.

Example 1
As a base material, a coated paper having a thickness of 175 μm (manufactured by Daio Paper Co., Ltd.) was prepared, and an intermediate layer ink having the following composition was applied on one side thereof with a bar coater at a coating amount of 1.2 g / m ² , The intermediate layer was formed by drying with a dryer. Thereafter, a coating solution for the receiving layer having the following composition is applied onto the intermediate layer with a bar coater to a coating amount of 4.0 g / m ² when dried, dried with a dryer, and further dried in an oven at 100 ° C. for 30 seconds. A receiving layer was formed. In addition, on the polyethylene terephthalate film on the other surface side of the substrate, a back surface primer layer coating solution having the following composition was applied with a gravure coater so as to be 1.2 g / m ² after drying, at 110 ° C. After drying for 1 minute, a back surface layer coating solution having the following composition is dried on it, coated with a gravure coater so as to be 2.0 g / m ² , dried at 110 ° C. for 1 minute, and a back surface primer layer And the back layer was formed, and the thermal transfer image receiving sheet was obtained.

<Intermediate layer coating solution>
・ Polyester resin (Polyester WR-905 manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) 50 parts ・ Titanium oxide (TCA888 manufactured by Tochem Products Co., Ltd.) 20 parts ・ Fluorescent whitening agent (Ubitex BAC Ciba Specialty Chemicals) Made by Co., Ltd.)
1.2 parts, water 14.4 parts, isopropyl alcohol 14.4 parts

<Composition of coating solution for dye receiving layer>
・ Vinyl chloride-vinyl acetate copolymer (manufactured by Nissin Chemical Industry Co., Ltd., trade name: Solvain C)
60 parts, epoxy-modified silicone (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-22-3000T)
1.2 parts, methylstil modified silicone (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: 24-510)
0.6 partsMethyl ethyl ketone 2.5 partsToluene 2.5 parts

<Composition of coating liquid for back primer layer>
・ Urethane resin (manufactured by Showa Ink Industry Co., Ltd., trade name: OPT primer) 100 parts ・ Isocyanate curing agent (manufactured by Showa Ink Industry Co., Ltd., trade name: OPT curing agent) 5 parts

<Composition of coating solution for back layer>
・ Vinyl butyral resin (manufactured by Denki Kagaku Kogyo Co., Ltd., trade name: Denkabutyral 3000-1) 10 parts ・ silicon dioxide (manufactured by Fuji Silysia Chemical Co., Ltd., trade name: Silicia 380) 0.75 part ・ Titanium chelate ( Denka Polymer Co., Ltd., trade name: AT chelating agent) 0.117 parts

  Using a blade with a blade angle of 50 ° on the thermal transfer image receiving sheet, the length of the cut portion is 0.28 mm, the length of the uncut portion is 0.30 mm, and the ratio of the length of the cut portion is 48.3%. Perforations were formed to obtain the thermal transfer image receiving sheet of Example 1.

(Examples 2-5, Comparative Examples 1-4)
Prepare the same thermal transfer image-receiving sheet used in Example 1, and change the blades that form perforations, as shown in Table 1 below, the length of the cut portion, the length of the uncut portion, and Thermal transfer image-receiving sheets of Examples 2 to 5 and Comparative Examples 1 to 4 having perforations with different ratios of the lengths of the cut portions were obtained.

(Evaluation of processability)
Using each of the thermal transfer image receiving sheets of Examples 1 to 5 and Comparative Examples 1 to 4, white solid printing was performed with a sublimation thermal transfer printer (Dai Nippon Printing Co., Ltd .: DS-SL10), and inside the printer during printing It was visually confirmed whether or not the perforation was torn. The results are shown in Table 1 below. In addition, the judgment criteria of ○ and X in Table 1 are as follows.
○: The perforation was not torn.
X: The perforation was torn.

(Evaluation of perforation cuts)
For each of the thermal transfer image-receiving sheets of Examples 1 to 5 and Comparative Examples 1 to 4, it was confirmed whether or not the perforated part could be separated as it was without folding back. The results are shown in Table 1 below. In addition, the judgment criteria of ○ and X in Table 1 are as follows.
○: Separation was possible.
X: The part other than the perforation was torn.

(result)
Table 1 shows the characteristics of the thermal transfer image-receiving sheets of Examples 1 to 5 and Comparative Examples 1 to 4 and the evaluation results of each evaluation.

  From the above results, the thermal transfer image-receiving sheet according to the embodiment of the present invention does not tear the perforation part accidentally inside the printer, and therefore, problems such as paper jam, printing failure, and abnormal noise occur. On the other hand, it was found that, after the end of printing, the perforated portion can be cut off without being folded. According to the present invention, it has also been found that both processing suitability and cutting ability can be satisfactorily secured even when relatively inexpensive coated paper is used.

DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Receptive layer 3 ... Perforation 3a ... Perforated cut part 3b ... Perforated uncut part 10 ... Thermal transfer image receiving sheet

Claims (1)

A thermal transfer image-receiving sheet comprising a receiving layer on a substrate,
The thermal transfer image receiving sheet is provided with a detachable perforation,
The substrate includes coated paper;
The ratio of the length of one cut portion to the sum of the length of one cut portion constituting the perforation and the length of one uncut portion adjacent to the cut portion is 47% or more and 55% or less. And the length of the one uncut portion is longer than 0.23 mm,
A thermal transfer image-receiving sheet.

Images