JP6514670B2 - Transfer paper - Google Patents

Description

  The present invention relates to a transfer sheet used to transfer a pattern in a transfer printing method of forming a pattern on a substrate such as a fiber material.

  As a method of forming a pattern on a printed material such as a fiber material, a pattern is printed on transfer paper using a sublimation type textile printing ink to prepare a transfer paper, and the transfer paper is brought into close contact with the substrate to be printed. There is known a transfer printing method for transferring to a substrate (see, for example, Patent Document 1 and Patent Document 2).

Transfer paper used for the transfer printing method is known.
For example, as a sublimation transfer sheet which is excellent in the absorbability of water-based ink and can obtain a clear recorded image without bleeding etc. and is also excellent in the ink transfer efficiency to the transfer object at the time of sublimation transfer, Material and an ink receiving layer provided on one side or both sides of the sheet-like substrate, wherein the ink receiving layer contains a pigment, a binder and a cationic resin, and the binder includes starch, starch derivatives, A sheet for sublimation transfer characterized in that any one or a mixture of two or more of polyvinyl alcohol and modified polyvinyl alcohol is used is known (see, for example, Patent Document 3).
In addition, the ink absorption and drying properties are excellent in ink jet printing using a sublimation printing ink, and the workability is good, and the image reproducibility on the surface of the transfer paper, the heat resistance at the time of heat transfer, after transfer As a sublimation type ink jet printing transfer paper having good characteristics also in terms of image reproducibility on the surface of the transferred material and transfer efficiency, having a sublimation type printing ink receiving layer on the substrate, wherein the sublimation type printing ink receiving layer Contains a water-soluble resin and fine particles, and contains synthetic amorphous silica as the fine particles, and the relative value of the ultrasonic wave transmission intensity on the sublimation type printing ink receiving layer side of the sublimation type ink jet printing transfer paper A sublimation type ink jet printing transfer paper having a peak of minimum value within 3 seconds of measurement time is known (see, for example, Patent Document 4).

  As a method of producing a transfer paper by printing a design on a transfer paper using an ink containing a sublimation dye or a sublimation printing ink, as described in Patent Document 3 and Patent Document 4, an inkjet printing method is used. It is often used.

JP, 2015-168705, A JP, 2015-124324, A JP, 2010-158875, A JP, 2010-058335, A

It is necessary to have two contradictory characteristics between the transfer sheet which is a blank sheet before the design is printed and the transfer sheet obtained by printing the design on the transfer sheet. That is, the transfer paper is required to have the ability to accept the sublimation type printing ink well, and the transfer paper is required to have the ability to transfer the sublimation type printing ink to the substrate well.
Since the transfer paper becomes a transfer paper having a sharp image so that the image quality of the design formed on the substrate is not deteriorated, it is necessary to improve the receptivity to the sublimation type printing ink. Furthermore, it is necessary for the transfer sheet not to deteriorate the image quality of the pattern formed on the substrate from the transfer sheet having a sharp image.

  Also, in order to transfer the transfer sheet and the substrate, the transfer sheet must be able to be in close contact with the substrate. In the case of continuous transfer to a substrate, transfer is performed by bringing a roll-like transfer sheet into close contact with the substrate. In particular, in order to continuously advance the transfer, it is more important that the transfer paper adheres well to the substrate.

  Further, in the transfer printing method, there is fog as a problem of the image quality different from the deterioration of the image quality of the pattern formed on the substrate. Fog is a phenomenon in which sublimation type printing ink is sublimated and transferred to a region different from the pattern when the sublimation type printing ink is transferred from the transfer paper to the printing material. Typically, this is a phenomenon in which spot dirt occurs on a white background. Although methods of suppressing fog are being studied by the technology of sublimation type textile printing ink, methods of suppressing fog by transfer paper are also required.

  The quality of the sublimation transfer sheet of Patent Document 3 and the quality of the sublimation type ink jet printing transfer paper of Patent Document 4 are not necessarily sufficient, and in particular, improvement with regard to antifogging properties is desired.

In view of the above, it is an object of the present invention to provide a transfer sheet which satisfies the following items.
(1) There is no deterioration of the image on the substrate and good resistance to image deterioration.
(2) Good adhesion between the transfer paper and the substrate, and good adhesion.
(3) It is possible to suppress the occurrence of fogging on a substrate and to be excellent in fog suppression properties.

As a result of intensive studies to solve the above problems, the inventors of the present invention achieve the objects described below.
[1] A transfer sheet used in a transfer printing method using a sublimation printing ink, comprising a base paper and one or more coating layers on at least one side of the base paper, wherein the coating of the transfer sheet is carried out A transfer sheet having a Parker print surf surface roughness of 2.5 μm or more and 4.5 μm or less according to ISO 8791-4: 1992 on the side having a layer.

  [2] The transfer sheet according to the above [1], wherein the outermost coating layer positioned outermost with respect to the base paper in the coating layer contains at least kaolin, calcium carbonate and a water-soluble calcium salt.

  [3] The transfer paper according to [2], wherein the water-soluble calcium salt is at least one selected from the group consisting of calcium chloride and calcium nitrate.

  According to the present invention, it is possible to provide a transfer sheet which is excellent in image deterioration resistance, adhesion and fog suppression.

The present invention will be described in detail below.
In the present invention, "transfer paper" refers to paper in a blank state before a pattern to be transferred is printed. "Transfer sheet" refers to a sheet on which a pattern to be transferred to the transfer sheet is printed.

The transfer sheet has a base sheet and one or more coated layers on at least one side of the base sheet. In the coating layer, the coating layer located outermost with respect to the base paper is referred to as the outermost coating layer. When the coating layer is one layer, the coating layer is the outermost coating layer. In the case where the coating layer is two or more layers, the coating layer present between the base paper and the outermost coating layer is either a coating layer containing a pigment and a binder or a coating layer not containing a pigment. There is no particular limitation.
The coating layer is preferably one layer in view of the production cost. Also, the coating layer may be provided on one side or both sides of the base paper. When the outermost coated layer according to the present invention is provided on one side of the base paper, the transfer paper may have a conventionally known backcoat layer on the back side of the base paper.

The coating amount of the coating layer is not particularly limited. Terms easily brought into close contact against manufacturing cost and the substrate of the transfer sheet, the coating weight is preferably 2 g / m ² or more 70 g / m ² or less per side dry solid content. In the range of the said coating amount, 30 g / m < ² > or less is more preferable, and, as for the upper limit of a coating amount, 10 g / m < ² > or less is more preferable. Furthermore, the upper limit of the coating amount is most preferably 8 g / m ² or less, from the viewpoint of easily preventing the loss of the outermost coating layer when the transfer paper and the printed material are in close contact with each other. The coating amount is the value of the total of two or more coating layers per one side.

  The base paper is a chemical pulp such as LBKP (Leaf Bleached Kraft Pulp), NBKP (Needle Bleached Kraft Pulp), GP (Groundwood Pulp), PGW (Pressure GroundWood pulp), RMP (Refiner Mechanical Pulp), TMP (ThermoMechanical Pulp), CTMP Calcium carbonate, talc, clay, kaolin, etc. for at least one kind of pulp selected from mechanical pulps such as (ChemiThermoMechanical Pulp), CMP (ChemiMechanical Pulp), CGP (ChemiGroundwood Pulp), and recycled paper pulp such as DIP (DeInked Pulp) The paper-making paper is a papermaking paper stock containing various additives such as sizing agents, fixing agents, retention agents, retention agents, cationizing agents, paper strengthening agents, and the like, as required. Furthermore, the base paper includes high-quality paper obtained by subjecting papermaking paper to calendering, surface sizing with starch, polyvinyl alcohol or the like, or surface treatment. Furthermore, the base paper includes high-quality paper that has been subjected to surface sizing and surface treatment and then calendered.

  Papermaking is carried out using a conventionally known paper machine by adjusting the stock to be acidic, neutral or alkaline. Examples of the paper machine include a Fourdrinier paper machine, a twin wire paper machine, a combination paper machine, a cylinder paper machine, a Yankee paper machine and the like.

  Other additives such as pigment dispersants, thickeners, flow improvers, antifoam agents, foam inhibitors, mold release agents, foaming agents, penetrants, coloring dyes, color pigments, fluorescence One or more types of whitening agents, ultraviolet light absorbers, antioxidants, preservatives, anti-biocides, water proofing agents, wet strength agents, dry strength agents, etc. It can mix | blend suitably in the range which does not impair.

The basis weight of the base paper is not particularly limited. The basis weight of the base paper is preferably 10 g / m ² or more and 100 g / m ² or less, and more preferably 40 g / m ² or more and 90 g / m ² or less, from the viewpoint of ease of handling when the transfer paper and the substrate are in close contact. Further, the thickness of the transfer sheet is not particularly limited. The thickness of the transfer sheet is preferably 0.01 mm or more and 0.5 mm or less, and more preferably 0.05 mm or more and 0.3 mm or less, from the viewpoint of ease of handling when the transfer sheet and the printed material are in close contact.

The transfer sheet has one or more coated layers on at least one side of the base sheet.
The coating layer or the outermost coating layer can be provided on the base paper or on the coating layer by coating and drying each coating layer coating liquid. There is no particular limitation on the method of providing. For example, a method of coating and drying using a coating device and a drying device conventionally known in the papermaking field can be mentioned. As an example of a conventionally known coating apparatus, mention may be made of a size press, a gate roll coater, a film transfer coater, a blade coater, a rod coater, an air knife coater, a comma coater, a gravure coater, a bar coater, an E bar coater, a curtain coater and the like. Can. Examples of drying devices include various drying devices such as linear tunnel dryers, arch dryers, air loop dryers, hot air dryers such as sine curve air float dryers, infrared heating dryers, dryers using microwaves, etc. Can.

The transfer paper is a Parker printed surf surface according to ISO 8791-4: 1992 "Paper and board-Determination of roughness / smoothness (air leak methods)-Part 4: Print-surf method" on the side having the coated layer. The roughness is not less than 2.5 μm and not more than 4.5 μm. Parker printed surf surface roughness is measured based on the amount of air that escapes the gap created between the narrow ring-shaped measurement surface and the surface of the sample. Therefore, Parker Print Surf's surface roughness is the surface roughness that reflects the cushioning properties of the transfer sheet.
The Parker print surf surface roughness of the present invention is a value measured at a clamping pressure of 2000 kPa using a soft type backing in accordance with ISO 8791-4: 1992. The Parker Print Surf surface roughness can be measured, for example, using a Messmer Parker Print Surf Roughness Tester.
If the Parker Print Surf surface roughness is less than 2.5 μm, adhesion can not be obtained. When the Parker Print Surf surface roughness is more than 4.5 μm, the image deterioration resistance or the antifogging property can not be obtained.

  Parker print surf surface roughness is a physical quantity conventionally known in the field of papermaking as described in, for example, JP 2008-255552 A, WO 2007/069683 pamphlet, etc. It can be adjusted by the method of For example, in the case of base paper, the type of pulp to be used, conditions of freeness condition and press pressure by beating, presence or absence of calendering treatment on base paper, treatment conditions thereof, and in coated layer, presence or absence of calendering treatment on coated layer It can be suitably adjusted depending on the treatment conditions, the type and amount of the pigment in the coating layer, the coating amount and the like.

  The outermost coating layer of transfer paper preferably contains at least kaolin and calcium carbonate as pigments and a water-soluble calcium salt. The reason for this is that the image deterioration resistance, the adhesion or the antifogging property is improved.

  The mass ratio of kaolin to calcium carbonate in the outermost coating layer is preferably kaolin: calcium carbonate = 9: 1 to 5: 5. When an inkjet printing method is used in the method of printing a design on transfer paper, calcium carbonate is preferably heavy calcium carbonate from the viewpoint of printability with respect to the inkjet printing method.

The outermost coating layer can contain conventionally known pigments in addition to kaolin and calcium carbonate. Examples of conventionally known pigments include organic pigments such as inorganic pigments such as talc, satin white, lithopone, titanium oxide, zinc oxide, silica, alumina, aluminum hydroxide, zinc oxide, activated white earth, diatomaceous earth, and plastic pigments. It can be mentioned. The outermost coating layer can be contained in combination with kaolin and calcium carbonate by combining one or more of these pigments.
The proportion of kaolin and calcium carbonate in the pigment of the outermost coating layer is preferably 80% by mass or more.

  The water-soluble calcium salt is a calcium salt which can be finally dissolved in water at 20 ° C. in an amount of 1% by mass or more. Examples of the water-soluble calcium salt include salt compounds such as calcium nitrate, calcium chloride, calcium formate, calcium acetate and calcium lactate, and complex salt compounds such as calcium ethylenediaminetetraacetate. The water-soluble calcium salt is one or more selected from the group consisting of these. Among these, the water-soluble calcium salt is preferably one or more selected from the group consisting of calcium chloride and calcium nitrate.

  The content of the water-soluble calcium salt in the outermost coating layer is preferably 2 parts by mass to 30 parts by mass with respect to 100 parts by mass of the pigment in the outermost coating layer. The lower limit of the content is more preferably 5 parts by mass or more, and still more preferably 10 parts by mass or more. 25 mass parts or less are more preferable, and, as for the upper limit of content, 20 mass parts or less are more preferable.

The outermost coating layer preferably contains a conventionally known binder in the coated paper field.
Examples of conventionally known binders include starch and various modified starches thereof, cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, casein, gelatin, soy protein, pullulan, gum arabic, karaya gum, natural polymer resin such as albumin, or a derivative thereof Polyvinyl pyrrolidone, polyvinyl alcohol and various modified polyvinyl alcohols thereof, polyacrylamide, polyethylene imine, polypropylene glycol, polyethylene glycol, maleic anhydride resin, acrylic resin, methacrylic acid ester-butadiene copolymer, styrene-butadiene copolymer, Functional group-modified copolymer with monomer containing functional group such as carboxyl group of ethylene-vinyl acetate copolymer or these various copolymers, melamine resin, urea resin The binder of the thermosetting synthetic resin etc., polyurethane resins, unsaturated polyester resins, polyvinyl butyral, can be exemplified alkyd resin latex. The outermost coating layer can contain one or more selected from the group consisting of these binders.
From the viewpoint of image degradation resistance, the binder is preferably at least one selected from the group consisting of starch and its various modified starches, and polyvinyl alcohol and its various modified polyvinyl alcohols.

  The content of the binder in the outermost coating layer is preferably 5 parts by mass to 60 parts by mass and more preferably 20 parts by mass to 40 parts by mass with respect to 100 parts by mass of the pigment in the outermost coating layer.

The outermost coating layer can contain various additives conventionally known in the coated paper field as needed. Examples of additives include dispersants, fixing agents, thickeners, flow improvers, antifoaming agents, mold release agents, foaming agents, penetrants, color pigments, color dyes, fluorescent brighteners, UV absorbers And antioxidants, preservatives, antibiocides and the like.
Moreover, the outermost coating layer can contain various adjuvants conventionally known by the transfer printing method. The auxiliary agent is added to optimize various physical properties of the outermost coating layer coating liquid, or to improve the dyeability of the sublimation type printing ink to be transferred. Examples of the auxiliaries include various surfactants, moisturizers, wetting agents, pH adjusters, alkali agents, concentrated dyes, deaerators, and reduction inhibitors.

The transfer paper can be obtained by printing a design on the side of the transfer paper having the outermost coating layer, using various printing methods known in the prior art including sublimation type textile printing ink.
Various printing methods for printing a design on transfer paper are conventionally known printing methods and are not particularly limited. Examples of the printing method include gravure printing, inkjet printing, electrophotographic printing, and screen printing. Among them, the inkjet printing method is preferable in terms of high definition of image quality and miniaturization of the apparatus.

  The transfer printing method using sublimation type printing ink is a method comprising the steps of printing a design on a transfer sheet to obtain a transfer sheet, and bringing the transfer sheet into close contact with a substrate. The step of adhering includes heating and pressurization as necessary. The heating and pressurizing conditions in the step of adhering are the conditions conventionally known in the transfer printing method. The step of bringing the film into close contact may include, for example, a method of bringing the transfer sheet into close contact with the substrate by a press, a heating drum or the like, and heating and pressing.

  The substrate is a fiber material and is not particularly limited. The fiber material may be either a natural fiber material or a synthetic fiber material. Examples of natural fiber materials include cellulose-based fiber materials such as cotton, hemp, lyocell, rayon and acetate, and protein-based fiber materials such as silk, wool and animal hair. Examples of synthetic fiber materials include polyamide fiber (nylon), vinylon, polyester, polyacrylic and the like. Examples of the structure of the fiber material include woven fabric, knitted fabric, non-woven fabric and the like alone, mixed spinning, mixed fiber or cross-woven cloth, and the like. Furthermore, these configurations may be combined. Moreover, you may pre-process a to-be-printed material by the chemical | medical agent etc. which are effective in dyeing promotion as needed.

  Hereinafter, the present invention will be described in more detail by way of examples. The present invention is not limited to these examples. Here, "parts by mass" and "% by mass" represent "parts by mass" and "% by mass" of the dry solid content or the amount of the substantial component, respectively. The coating amount of the coating layer represents the dry solid content.

<Base paper>
20 parts by mass of calcium carbonate as a filler, 1.2 parts by mass of amphoteric starch, 0.8 parts by mass of sulfuric acid band, internal sizing agent are added to a pulp slurry consisting of 100 parts by mass of LBKP with a freeness of 380 ml csf The paper was formed by a machine, surface sizing agents were adhered to both sides by a size press, and machine calendering was performed to produce a base paper.
Calendar conditions were suitably changed so that the Parker print surf surface roughness based on ISO8791-4: 1992 of the transfer paper obtained might turn into a predetermined value.

Outermost Coating Layer Coating Liquid
The outermost coating layer coating liquid was prepared according to the following contents.
Kaolin parts described in Table 1 Heavy calcium carbonate parts described in Table 1 Silica parts described in Table 1 Phosphate esterified starch 15 parts by mass Polyvinyl alcohol 10 parts by mass Water-soluble salt Types and parts described in Table 1 Above content And mixed and dispersed with water to adjust the concentration to 48 mass%.

<Transfer paper>
A transfer sheet was prepared in the following procedure.
After coating the outermost coating layer coating liquid described in Table 1 on both sides with an air knife coater on a base paper and drying it, Parker print surf surface rough according to ISO 8791-4: 1992 of transfer paper obtained. Calender processing was performed so as to obtain a predetermined value, and transfer paper of each example and each comparative example was obtained. The coating amount was 6 g / m ² per one side.

<Transfer paper>
Using the ink jet printer (JV2-130II, manufactured by Mimaki Engineering Co., Ltd.) using sublimation type textile printing ink, the pattern for evaluation by sublimation type textile printing ink (cyan, magenta, yellow, black) was used as the transfer paper obtained above. It printed and obtained the transfer paper.

<Fabrication>
A roll of polyester cloth was used as a substrate. The obtained roll paper-like transfer paper and polyester cloth were brought into close contact, and the dye was transferred to the polyester cloth using a heating and pressing machine (190 ° C., 0.5 MPa, 2.5 m / min, roller type). Thereafter, the transfer paper was peeled off from the polyester cloth to obtain a polyester cloth having a pattern formed thereon.

<Evaluation of image degradation resistance>
With respect to the printed matter on which the design was formed, the image quality was evaluated in a sensory manner from the point of sharpness of the design based on the following criteria. In the present invention, it is assumed that the transfer paper has good image deterioration resistance if the evaluation is A or B.
A: No deterioration in image quality observed, good level.
B: Almost no deterioration in image quality observed, generally good level.
C: Deterioration of the image quality is recognized, but there is no problem in practical use.
D: A level at which image deterioration which is practically impossible is recognized.

<Evaluation of adhesion>
With respect to the printed matter on which the design was formed, the adhesion was evaluated sensory based on the following criteria in terms of the degree of occurrence of transfer unevenness and distortion of the design. In the present invention, in the case of the evaluation A or B, the transfer paper has good adhesion.
A: Good level with no transfer unevenness or distortion.
B: Almost no transfer unevenness or distortion is observed, and the level is generally good.
C: Transfer unevenness or distortion is observed, but there is no problem in practical use.
D: Uneven transfer or distortion is recognized, which is a level that causes problems in practical use.

<Evaluation of antifogging properties>
The antifogging properties were evaluated visually for the presence or absence of spotted stains on a substrate by a magnifying glass and visual observation, and based on the following criteria. In the present invention, in the case of the evaluation A or B, it is assumed that the transfer sheet has good antifogging properties.
A: Magnifier does not show spot stains and is at a good level.
B: No spot stains were observed visually, and the level was generally good.
C: The practical lower limit level of the thing in which the spot dirt which does not become a defect is recognized visually.
D: Spotting stains that cause problems are visually recognized, and the level is not practical.

  The evaluation results are shown in Table 1.

From the evaluation results of Table 1, it is understood that Examples 1 to 14 corresponding to the present invention have good image deterioration resistance, adhesion, and antifogging properties. However, it is understood that Comparative Examples 1 to 4 which do not satisfy the configuration of the present invention can not obtain these effects.
It is understood from the comparison between Examples 1 to 6 and Examples 9 to 11 that the outermost coating layer preferably contains kaolin, calcium carbonate and a water-soluble calcium salt.
In addition, it is understood from the comparison of Examples 1 to 5 and Example 6 that at least one water-soluble calcium salt is preferably selected from the group consisting of calcium chloride and calcium nitrate.

Claims (2)

A transfer paper used in a transfer printing method using a sublimation printing ink, comprising a base paper and at least one coating layer on at least one side of the base paper, wherein the base paper is used as the basis of the coating layer. The outermost coating layer located as the outermost layer contains at least kaolin, calcium carbonate and a water-soluble calcium salt, and the content of the water-soluble calcium salt in the outermost coating layer is in the outermost coating layer The water-soluble calcium salt is at least one member selected from the group consisting of calcium chloride and calcium nitrate per 100 parts by weight of the pigment, and on the side of the transfer paper having the coated layer, ISO 8791 -4: Transfer paper having a Parker Print Surf surface roughness of 2.5 μm to 4.5 μm according to 1992. The transfer paper according to claim 1, wherein the content ratio by mass of kaolin to calcium carbonate in the outermost coating layer is kaolin: calcium carbonate = 9: 1 to 5: 5.