KR20170083278A - Quick drying sublimation transfer paper for textile printing - Google Patents

Abstract

Since the fiber transfer paper according to the present invention has a coating layer having a pore volume of 2.5 mL / g or more at a void size of 1 mu m or less, not only the dryness is improved but also a clear image can be reproduced on the transferred object, Reducing production costs and increasing production speed.

Description

{QUICK DRYING SUBLIMATION TRANSFER PAPER FOR TEXTILE PRINTING}

The present invention relates to a quick drying fiber transfer sheet, and more particularly to a quick drying fiber transfer sheet excellent in drying speed and image reproducibility.

Transfer paper is used to indirectly print images on objects such as paper or fabric.

Various printing techniques can be used to print patterns, designs, or print images on transfer paper, including flexo printing, offset printing, intaglio printing, rotary screen printing, and inkjet printing.

Also, depending on the printing technique, the ink may be in the form of a dilute liquid or paste.

In particular, a sublimation transfer printing method using a sublimation type ink is widely used. In the sublimation transfer printing method, a barrier layer composition is coated on a substrate layer such as a paper sheet, an image is printed thereon with a sublimation type dispersion ink, A method in which a desired image is transferred onto an adherend by sublimating the dye of the sublimation-type ink by heating and pressurizing after adhering it to a transfer object.

While heat and pressure are applied and the dye in the ink is transferred, some of the dye remains on the transfer paper. The degree to which a sublimable dye is transferred from the transfer paper to the fiber during the transfer process is referred to as the transfer efficiency.

The transfer paper which is currently being commercialized is not able to sufficiently accept the drying speed of a digital printing machine and the like, which are increasingly being speeded up, thereby limiting the productivity of the output product. Therefore, inkjet paper is used to reproduce sharp images with very fast drying and clear images. Or, inkjet copy paper with low image reproducibility and high drying speed is used. Such a product can be mass-produced because the drying speed is high. However, since the transfer efficiency is low, the amount of ink consumption is increased compared with the specialty transfer paper, which is a burden on the production cost.

Therefore, there is a demand for a transfer paper in which the leaching phenomenon after transferring is suppressed, the transfer efficiency is high, the clear image can be provided, and the dryness is excellent and the productivity of the printing machine is improved.

It is an object of the present invention to provide a quick-drying fiber transfer sheet which can overcome the disadvantages of the prior art as described above and can dry the printing ink in a short time, is excellent in transfer efficiency, and can reproduce a clear image on a transfer object .

In order to achieve the above object,

The present invention provides a quick-transfer printing paper provided with a coating layer having a total volume of pores having a pore size of 1 mu m or less of 2.5 mL / g or more.

According to one embodiment, the pores may have a volume of pore size of 0.1 mL / g or more in each of pores having a pore size ranging from 0.4 to 0.2 μm.

According to one embodiment, _(.6 PV ₀₎ of the pore volume 0.6㎛ pore size may be smaller than the pore size of 0.3㎛ pore volume (PV _{0 .3).}

According to one embodiment, the coating layer may comprise a pigment having an air entrainment of 50 or more.

According to one embodiment, the coating layer may comprise a pigment having a light scattering coefficient of 0.1 or more.

According to one embodiment, the transfer paper may have an air permeability of at least 10 mL / min.

According to one embodiment, the coating layer may have a degree of roughness of 5 占 퐉 or less.

The transfer paper according to the present invention has a coating layer having a total volume of pores having a pore size of 1 占 퐉 or less of 2.5 mL / g or more, thereby improving dryness as well as eliminating the phenomenon of leaching into paper after transfer, And at the same time, the ink consumption amount is reduced, thereby reducing the production cost.

FIG. 1 is a graph showing the results of measurement of the volume of the transfer paper according to the pore size according to the examples and the comparative examples.
Fig. 2 shows a graph in which the sum of the pore volumes at a pore size of 1 mu m or less is compared with the transfer papers of Examples and Comparative Examples.
Fig. 3 shows SEM images of the surfaces of transfer paper of Examples and Comparative Examples.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the present invention is not intended to be limited to any particular embodiment, but is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, the present invention will be described in detail.

The present invention provides a fast-drying transfer paper capable of mass production and excellent image reproduction in response to the trend of a high-speed printing press.

The quick-release transfer paper of the present invention is characterized by having a coating layer having a total volume of pores having a pore size of 1 mu m or less of 2.5 mL / g or more.

Generally, in order to reduce the amount of dye not transferred in the transferring step, a coating layer is applied to the printed surface of the transfer paper so that the dye is more easily transferred to the transferring object. That is, the coating layer ensures that the dye of the ink is not absorbed too deeply into the base layer (paper) of the transfer paper, and the material (ink) applied to the coating layer is easily re-emitted or removed.

Various attempts have been made to improve the transfer efficiency, printability, or dryness by improving the function of such a coating layer, and the present inventors have completed the present invention as a part of this research.

In order to improve the drying property of the transfer paper, pigments are added to the coating layer. As the pigment, particles having an average particle diameter of 0.1 to 15 μm and having good water absorbability are used in excess of the binder. For example, . When the amount of the pigment and the binder is appropriately combined, porosity is formed between the particles due to the particle size of the pigment, so that the coating layer has porosity. The size of such pores can vary. Generally, the larger the pore size, the larger the pore volume, and the smaller the pore size, the smaller the pore volume.

However, according to the study of the present inventors, it has been found that the larger the volume occupied by voids of a predetermined size or less, the more various characteristics including drying can be improved.

According to the present invention, the coating layer has a total volume of pores having a pore size of 1 占 퐉 or less of 2.5 mL / g or more, preferably 2.6 mL / g or more, more preferably 2.7 mL / g or more, 4 mL / g or less, but the present invention is not limited thereto.

In the present invention, the size and volume of the voids can be based on the value measured by the mercury porosimetry (ASTM D4404).

According to one embodiment, the pores may have a volume of pore size of 0.1 mL / g or more in each of pores having a pore size ranging from 0.4 to 0.2 μm.

In addition, the volume (PV _{0 .6)} of the pore pore size 0.6㎛ can be rather smaller than the size of the pores of 0.3㎛ pore volume (PV _{0 .3).} In addition, the void volume may exhibit a maximum value in a pore size range of 0.1 탆 to 0.5 탆, preferably in a range of 0.2 탆 to 0.4 탆 in a pore volume value in a pore size range of 0.05 탆 to 0.6 탆. This tendency is different from that of the existing coating layer.

The average particle diameter of the pigment used in the coating layer is not particularly limited, but may be 0.1 to 15 탆.

The weight ratio of the pigment to the binder may be 100: 2 to 50, and may be 100: 5 to 50 or 100: 10 to 40, for example.

The pigment may be silica, calcium carbonate, clay, talc, aluminum hydroxide or the like, but it is preferable to use a calcined clay having an oil absorption of 50 mL / 100 g or more and a light scattering coefficient of 0.1 or more. These characteristics are two to three times as much inductance and about 50 times higher light scattering coefficient than general clay.

The above-mentioned inhalation induction may be more preferably 70 mL / 100 g or more or 90 mL / 100 g or more, and the upper limit thereof is not particularly limited, but it may be 360 mL / 100 g or less, or 300 mL / 100 g or less.

The light scattering coefficient may be more preferably 0.15 or more, or 0.2 or more, and the upper limit thereof is not particularly limited, but may be 0.5 or less or 0.4 or less or 0.3 or less.

The absorption index and the light scattering coefficient can be determined according to the usual measurement method. However, the Gardner-Coleman method and the light scattering coefficient can be determined based on the values measured by the light scattering method.

The binder used in the coating layer may be carboxylmethyl cellulose (CMC), alginate, polyvinyl alcohol (PVA) or a mixture thereof or starch, guar gum, casein, protein, dextrin or modified polyacrylamide (PAM) , And is not particularly limited.

In addition, a small amount of a viscosity modifier, a very small amount of a fluorescent dye, an antiseptic, a printability improving agent, an antifoaming agent and the like may be added.

CMC or an acrylic thickener is suitably used as a viscosity modifier. The viscosity modifier is advantageous in controlling an appropriate coating amount by controlling the viscosity, and also allows the coating layer to be bulky and more porous, .

Polyamine-based or polyDADMAC-based cationic resins, metal salt resins, and the like can be used as the printability improving agent.

Other fluorescent dyes, preservatives, antifoaming agents, and the like are not limited as long as they are commonly used in the art, so a detailed description thereof will be omitted.

The transfer paper according to the present invention may have an air permeability of at least 10 mL / min. Preferably not less than 20 mL / min, more preferably not less than 30 mL / min, and the upper limit thereof is not particularly limited, but it may be 500 mL / min or less or 300 mL / min or less or 200 mL / min or less.

The permeability may be based on a value measured by the Bendtsen method (TAPPI UM 535).

Also, according to one embodiment, the coating layer may have a degree of roughness of 5 占 퐉 or less. The degree of roughness of the coating layer may be influenced by the size of the pigment particles, the particle size distribution, etc. In the case of the present invention, the degree of roughness can be controlled by applying a coating method such as blade and rod coating and a car-rendering process after coating. In the case of intaglio printing such as gravure printing, the degree of surface roughness is important, and therefore, it is preferable to control to the above-mentioned range.

The degree of roughness may be based on a value measured by Parker-Print Surf method (TAPPI T555 OM-15).

The coating layer forming method may be a general coating method such as an air knife method, and is not particularly limited.

The quick-drying fiber transfer paper of the present invention having the above-mentioned characteristics can be produced by appropriately filling the porosity of the paper in the course of penetration of the pigment into the paper together with moisture to form pores having the above-mentioned characteristics, And forms a small amount of fine voids in the coating layer to rapidly absorb moisture, which occupies most of the water-soluble ink, into the paper, thereby exhibiting fast drying.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be illustrative of the present invention only and should not be construed as limiting the scope or spirit of the invention as disclosed in the accompanying claims. It will be apparent to those skilled in the art that such variations and modifications are within the scope of the appended claims.

< Example  1> Pigment  Manufacture of coated fiber transfer paper

A pigment-coated fiber transfer paper was produced under the following conditions. In the following Examples and Comparative Examples, "parts" means parts by weight.

Coating layer composition

Pigment: plastic clay (absorption induction 100 ~ 105, light scattering coefficient 0.259) 100 parts

Binder: PVA (polyvinyl alcohol) (full-polymerization type polymerization degree 1700) 10 parts

Printing aptitude improving agent: 1.0 part of polyamine-based cationic resin (PAPYOGEN P-105G, SENA Corporation, Japan)

Coating liquid concentration 35%, viscosity 150CPS / Brookfield Viscometer 60 rpm, 1 min

Background conditions

50 g / m ² , SIZING 5, ASH 10%, LB 100%

Coating condition

Experimental coated rod bar No8

Drying conditions

Hot air dryer 105 占 폚 1 minute, coating weight 8 g / m ²

< Example  2>

A fiber transfer sheet was prepared in the same manner as in Example 1, except that 10 parts of PAM (Polyacrylamide, weight average molecular weight: 60,000 g / mol) was used as a binder in place of the amine-based cationic resin in Example 1 .

< Comparative Example  1>

The procedure of Example 1 was repeated except that instead of the calcined clay, 30 parts of clay having an absorption induction of 35 to 45 and a light scattering coefficient of 0.043 were used, 100 parts of PAM was used, and the amine-based cationic resin was not used To prepare transfer paper.

< Comparative Example  2>

100 parts of CMC (product of CPKelco, viscosity (4%, 25 ° C) 20 to 50 mPa.s) was used in place of the calcined clay in Example 1, 30 parts of clay having an absorption induction of 35 to 45 and a light scattering coefficient of 0.043 And a transfer sheet was prepared in the same manner as in Example 1, except that the amine-based cationic resin was not used.

< Comparative Example  3>

A transfer sheet was prepared in the same manner as in Example 1, except that 100 parts of clay having an absorption induction of 35 to 45 and a light scattering coefficient of 0.043 was used instead of the calcined clay in Example 1.

The coating layer compositions of the transfer paper prepared in Examples and Comparative Examples are as follows.

division Pigment (parts by weight) Binder (parts by weight) Additive (parts by weight) Example 1 The fired clay (100) The PVA 10, Amine-based cationic resin (1.0) Example 2 The fired clay (100) PVA 10, PAM 10, - Comparative Example 1 Clay (30) PAM (100) - Comparative Example 2 Clay (30) CMC 100, - Comparative Example 3 Clay (100) PVA (10) Amine-based cationic resin (1.0)

< Experimental Example  1> Measurement of pore volume, air permeability and roughness of transfer paper

The pore volume, the air permeability and the degree of roughness were measured on the coated surface of the transfer paper of Examples 1 and 2 and Comparative Examples 1 and 2 by the following method.

Pore Size and Pore Volume: Mercury Compression Method (ASTM D4404)

Measurement of air permeability: Bendtsen method (TAPPI UM 535)

Roughness degree: Parker-Print Surf method (TAPPI T555 OM-15)

The experimental results are shown in Table 2, Fig. 1 and Fig.

Total pore volume
(<1 μm) Specularity
(sec) Specularity
(mL / min) Roughness
(PPS (TOP))
(탆)
Product Specifications Example 1 2.79 140 85.4 2.1 Calcined clay, PVA, amine-based cationic resin Example 2 3.12 291 41.0 4.6 Calcined clay, PVA, PAM Comparative Example 1 1.78 40,500 0.295 5.0 Clay, PAM Comparative Example 2 1.93 37,600 0.318 7.8 Clay, CMC Comparative Example 3 2.47 1100 9.4 2.53 Clay, PVA, amine-based cationic resin

As can be seen from the results shown in FIG. 1 and Table 2, the fiber transfer paper according to the present invention has a pore volume of pores having a pore size of 1 m or less and a total pore size of 2.5 ml / g or more volume (PV _{0 .6)} smaller than the volume (PV _{0 .3)} of the air gap 0.3㎛ pore size, while the air permeability exceeds 10mL / min Comparative examples it can be seen that the transfer paper is does not.

< Experimental Example  2> SEM  Image analysis of surface of transfer paper

SEM images of the surfaces of the transfer sheets of Examples 1 and 2 and Comparative Examples 1, 2 and 3 are shown in Fig.

As can be seen from FIG. 3, it can be confirmed that the size and pore size of the surface of the fiber transfer paper according to the present invention is small and uniform.

< Experimental Example  3> Printability test

The Mimaki JV33-160 printer was used to measure transfer efficiency, drying speed, and other print conformance.

The ink used was a sublimation type transfer ink. The output was transferred to CMYK color after output, and the transfer efficiency, printability, and drying time were evaluated. The measurement results are shown in Table 3.

Transfer efficiency Drying time Print sharpness Print uniformity Example 1 76% 48 seconds 5 points 5 points Example 2 78% 52 seconds 5 points 5 points Comparative Example 1 75% 132 seconds 5 points 5 points Comparative Example 2 78% 175 seconds 5 points 5 points Comparative Example 3 72% 124 seconds 3 points 3 points

The experimental results were obtained by the following method.

Transfer efficiency

Each block image of CMYK color was printed on a transfer paper with a Mimaki JV33-160 printer, and the transfer paper printed as described above was placed on a transfer object (polyester fabric) and transferred at 200 ° C for 40 seconds. For each CMYK color, the transfer paper OD (optical density) and transferred transfer object OD were measured and calculated according to the following relationship. The higher the number, the better the transfer efficiency.

Transfer efficiency (%) = [1- (transfer paper OD) / (transferred object OD)] x 100

Drying time

A black block image was printed on a transfer paper with a Mimaki JV33-160 printer at an ink jetting amount of 270%, then a white paper was stacked on the paper, and a weight of 1 kg was placed on the paper for 10 seconds. Respectively. The smaller the number, the faster the ink dries.

Print sharpness and print uniformity

The visual evaluation method (1 ~ 5 points) of the image output to the Mimaki JV33-160 printer on transfer paper is better as the score is higher (1 point is poor, 5 points are better).

From the results shown in Table 3, it can be seen that the fiber transfer paper according to the present invention is excellent in both the transfer efficiency, the print sharpness and the print uniformity, and the drying property is remarkably excellent.

Claims (7)

Wherein the total volume of pores having a pore size of 1 mu m or less is 2.5 mL / g or more. The method according to claim 1,
Wherein the voids have a volume of pore size of 0.1 ml / g or more in a pore size range of 0.4 탆 to 0.2 탆, respectively. The method according to claim 1,
The voids volume of the pores in the pore size 0.6㎛ (PV _{0 .6)} in fiber transfer paper is smaller than the volume of the pore pore size 0.3㎛ (PV _{0 .3).} The method according to claim 1,
Wherein the coating layer comprises a coating layer comprising a pigment having an air entrainment of 50 or more. The method according to claim 1,
Wherein the coating layer comprises a coating layer comprising a pigment having a light scattering coefficient of 0.1 or more. The method according to claim 1,
Wherein the fiber transfer paper has a degree of permeability of at least 10 mL / min. The method according to claim 1,
Wherein the coating layer has a degree of roughness of 5 占 퐉 or less.

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