KR101946351B1 - Printing sheet for phototypography and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a digital fine art printing paper which can prevent excessive bleeding of ink even when a traditional material (such as Korean paper) is used, and at the same time it is possible to precisely reproduce a subtle part of the original such as blurring phenomenon unique to Oriental painting, And to a method for producing the same.
The printing material for making a Young's replica according to the present invention comprises: a backing paper made of paper or paper; A coating layer formed on an upper surface of the ground; And a folded ground attached to a lower surface of the ground.
The coating layer comprises a plurality of TiO ₂ microparticles and SiO ₂ A microcapsule comprising a core material made of fine particles and an outer wall made of a liposoluble resin which surrounds the core material; And a water-soluble resin layer in which a plurality of the microcapsules are dispersed and disposed.
The plurality of microcapsules are formed to have an average diameter of 100 to 200 nm, and are dispersed and disposed in the water-soluble resin layer at a packing ratio of 60 to 70%.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing material,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing material, and more particularly, to a printing material for making a duplicate, which is obtained by copying an original of a national treasury such as Oriental painting to a digital photograph, .

In order to preserve the national treasury paintings and book artifacts for a long time and to hand them to the posterity, it is common to store them in most of the museum's storehouses and to exhibit them as substitutes for young ones. In recent years, the art market, which has been regarded only as an exclusive item for the enthusiast and enthusiast, is entering the stage of popularization and commercialization. Digital fine art works as a main cause.

Digital fine art refers to conversation in which digital picture information (pixel information) obtained by drawing a picture with a graphic-tool on a computer or by scanning an existing picture is directly or edited on a computer screen, unlike a conventional picture. These digital fine arts can replicate the resulting paintings in large quantities regardless of their size and quantity, so that many people can buy and store works at a low price.

However, since digital fine art was originally developed for the spread of Western paintings, there was a point that it was not suitable for reproduction of Oriental paintings using hanji, silk, and hemp as base paper. That is, it does not spread when it is drawn on a paper of a medium viscosity of 500 cp or more as in the case of ink, but it is spread when it is printed on a paper sheet with a liquid having a low viscosity of 100 cp or less like inkjet ink. In addition, since the thickness of the yellowing paper is thin and uniform, the ink is bent at the time of inkjet printing, so that it is contaminated with the nozzle or broken after the output. As a result, in the case of Korean paper, there was a problem of improper use to be used as a printing paper for digital fine art because of its good spreadability.

In order to solve such a problem, recently, a printing material suitable for copying oriental painting in the digital fine art field has been actively developed. As a representative example, Korean Patent Registration No. 10-0470491 discloses a printing material in which a base layer made of hydrophilic synthetic resin is coated on one side of a base material and a folded ground is adhered to the bottom side of the base layer. However, in the case of the printing material, the above-described ink bleeding phenomenon can be reduced to a certain extent, but a support layer is formed on the opposite surface of the liquid pigment on the front surface where printing is performed, There has been a limitation that the best performance can not be realized as a printing paper for digital fine art.

In order to solve this problem, it is most preferable to coat the hydrophilic synthetic resin layer on the entire surface of the background paper. However, when the ink is sprayed on the surface of the hydrophilic synthetic resin layer, Moreover, since the surface of the hydrophilic synthetic resin layer is very uniform, light is reflected on the surface of the synthetic resin layer, and the art appreciation is not properly performed.

As a result, it is required to develop a printing material for making a reproduction which is capable of naturally overcoming the blurring phenomenon unique to Oriental painting and the shade of the pigment, while preventing excessive bleeding of the ink and at the same time ensuring proper spreading as necessary to be.

Prior Patent 1. Korean Patent No. 10-0470491 (Registered on January 28, 2005)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a resin coating layer on a top surface (i.e., a printing surface) of a printing paper to eliminate the ink bleeding problem of a conventional printing paper, And a process for producing the same.

It is still another object of the present invention to provide a printing material for producing a self-made copy which can reduce the problem that light is reflected by the coating layer when the resin coating layer is formed on the top surface of the printing paper, and a method for producing the same.

According to an aspect of the present invention, there is provided a printing material for producing a Young's-Self copy, comprising: a backing paper made of paper or paper; A coating layer formed on an upper surface of the ground; And a folded ground attached to a lower surface of the ground.

The coating layer comprises a plurality of TiO ₂ microparticles and SiO ₂ A microcapsule comprising a core material made of fine particles and an outer wall made of a liposoluble resin which surrounds the core material; And a water-soluble resin layer in which a plurality of the microcapsules are dispersed and disposed.

The plurality of microcapsules are formed to have an average diameter of 100 to 200 nm, and are dispersed and disposed in the water-soluble resin layer at a packing ratio of 60 to 70%.

The present invention provides a method for producing a print material for making a young copy, the method comprising the steps of: preparing a core material comprising a plurality of TiO2 fine particles and SiO2 fine grains; and an outer wall made of a lipophilic resin surrounding the core material, Preparing a capsule; Mixing a plurality of the microcapsules and a liquid water-soluble resin in a volume ratio of 6: 4 to 7: 3 to prepare a liquid mixture; Mixing the compounding liquid and water at a volume ratio of 1: 1 to 1: 2 to prepare a coating solution; Attaching a folded ground to a lower surface of a background paper made of paper or cloth; Forming a coating layer by applying the coating liquid on an upper surface of the ground; And drying and curing the coating layer.

Preferably, the method further comprises a step of heat treating the ground paper having the folded ground attached thereto with a hot plate and rubbing the ground paper with a steel material.

According to the printing material for producing a young color reproduction according to the present invention and the manufacturing method thereof, it is possible to effectively control the ink blurring phenomenon, so that even if a traditional material (such as Korean paper) is used as a digital fine art printing paper, It is possible to precisely reproduce the subtle portion of the original such as the blurring phenomenon unique to Oriental painting and the shade of the pigment.

According to the printing material for making a copy and the method of manufacturing the same according to the present invention, even when the resin coating layer is formed on the upper surface of the printing paper, light reflected by the coating layer can be reduced, It is effective.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process flow diagram of a method for manufacturing a printing material for making a copy of the Young's in accordance with the present invention; FIG.
2 is a cross-sectional view of a microcapsule according to the present invention.
3 is a cross-sectional view of a printing material in which a coating layer is formed according to the present invention.
4 is a comparative experimental example of a nano blend solution and a macro blend solution.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In the present specification, the term " above or above " means to be located above or below the object portion, and does not necessarily mean that the object is located on the upper side with respect to the gravitational direction. It will also be understood that when a section of an area, plate, or the like is referred to as being " above or above another section ", this applies not only to the case where the other section is " And the like.

Also, in this specification, when an element is referred to as being " connected " or " connected " with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.

Also, in this specification, the terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In the following, preferred embodiments, advantages and features of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a process flow chart of a method for manufacturing a print material for making a young person's copy according to the present invention, 2 is a sectional view of a microcapsule according to the present invention, and FIG. 3 is a sectional view of a printing material having a coating layer according to the present invention.

1 to 3, a method for manufacturing a print material for making a young man's copy according to the present invention includes steps of preparing a microcapsule S10, preparing a blend liquid S20, preparing a coating liquid S30, S40), a coating liquid application step (S50), and a coating layer curing step (S60).

(1) Micro capsule manufacturing step (S10)

The step (S10) of producing microcapsules according to the present invention is a process for manufacturing a core material having a fine particle shape and an outer wall (15) forming a shell of the core material. The core material is prepared, (15) to form a substantially spherical capsule shape.

The microcapsules 10 are prepared by chemical methods such as interfacial polymerization and coacervation in which the solubility of the substance in the outer wall 15 is changed by controlling the addition of non-solvent and pH, A physicochemical method such as an interfacial precipitation method in which a film is formed by removing a solvent of a substance, or a mechanical method such as a spray drying method.

On the other hand, the microcapsules 10 to be produced in step S10 are formed in an average diameter size of 100 nm to 200 nm, the reason for which will be described later.

The core material includes a plurality of TiO ₂ fine particles 11 and a plurality of SiO ₂ fine particles 13 as a constitution for reducing the amount of light reflected by the water-soluble resin layer 20 in the coating layer 30 in particular.

The outer wall 15 of the core material has a constitution for realizing blurring phenomenon peculiar to Oriental painting. The liquid pigment (i.e., aqueous ink) jetted onto the background paper 40 is moved a predetermined distance by the oil- A proper blurring phenomenon may occur.

Specifically, the microcapsule 10 is manufactured through an encapsulation process for forming the outer wall 15 on the core material, a gelling process for the capsule outer wall, a capsule outer wall curing process, and an aging process.

And the outer wall 15 is formed of a fat-soluble resin. The oil-soluble resin initially surrounds the outer surface of the core material in the form of a particulate, so that the core material is trapped inside the outer wall 15.

The outer wall 15 is preferably formed of a transparent oil-soluble polymer, and may be formed of at least one oil-soluble resin selected from, for example, aminoresin, polyamide resin and formaldehyde resin.

The prepared microcapsules 10 need to be cleaned. The cleaning may be performed using pure water, isopropyl alcohol, ethylene glycol, or the like. It is necessary to separate the microcapsules 10 from the aqueous solution or the washing liquid after the microcapsules 10 are cleaned. This may be performed by centrifugation or freeze drying.

(2) Blend solution production step (S20)

The blend liquid manufacturing step (S20) of the present invention is a process of mixing the microcapsules 10 with the liquid resin so that the microcapsules 10 obtained through the step 'S10' can be fixed on the base paper 40.

That is, the microcapsules 10 separated from the aqueous solution or the washing liquid must be fixed to one surface of the base paper 40, which is made of the liquid water-soluble resin 20. That is, if a compounding liquid is prepared by mixing a water-soluble resin (20) having a transparent physical property and a microcapsule (10) at a predetermined ratio, and then mixing the solution with water to apply the solution on one side of the base paper (40) The coating layer 30 in which the microcapsules 10 are dispersed in the water-soluble resin layer 20 is formed.

Meanwhile, the coating layer 30 of the present invention is characterized in that the microcapsules 10 are dispersedly disposed in the water-soluble resin layer 20 at a packing ratio of 60 to 70%. As used herein, the term " fill factor " used in the present invention refers to the fraction of the space occupied by a plurality of microcapsules 10 in the coating layer 30. [ In other words, by forming the coating layer 30 by mixing the microcapsules 10 and the liquid water-soluble resin 20 in a volume ratio of 6: 4 to 7: 3, the microcapsules 10 can be formed in the entirety of the coating layer 30 To 70% by volume.

The water-soluble resin layer 20 (that is, the liquid water-soluble resin) is preferably formed of a transparent water-soluble polymer and may be formed of at least one water-soluble resin selected from, for example, polyvinyl alcohol, acrylic resin and varnish.

(3) Coating liquid manufacturing step (S30)

The coating solution preparation step S30 of the present invention is a step of preparing a coating solution for forming the water-soluble resin layer 20 containing the microcapsules 10 on one side of the base paper 40. [

The coating solution is prepared by mixing the compounding solution prepared in step S20 with water, and mixing the compounding solution and water in a volume ratio of 1: 1 to 1: 2 in consideration of smooth application process and surface roughness of the applied coating solution desirable. If the compounding liquid is mixed more than water, the viscosity of the coating liquid is greatly increased, which makes the coating process difficult and the surface roughness of the cured coating layer 30 is deteriorated. On the other hand, if the water mixing ratio exceeds 1: 2, the coating solution becomes too thin and the coating layer 30 is not formed properly.

(4) Bonding step (S60)

The step of attaching the folded paper of the present invention (S60) is a step of attaching a folded paper sheet (50) such as a paper or cloth to the lower surface of the paper stock (40). The folded sheet 50 attached to the lower surface of the substrate 40 improves the planarity of the substrate 40 so that the coating liquid application operation S50 and the conveyance in the printing apparatus can be performed smoothly, It is possible to prevent the paper 40 from being damaged.

Refers to the side on which the liquid pigment such as ink is fixed and printed and the term "bottom" of the backing paper 40 refers to the opposite side of the top surface 40 Quot;

On the other hand, when the attachment of the folded ground 50 is completed, the heat treatment may be performed using a hot plate such as an iron, and rubbing and tapping with a steel material such as a bead or a smooth stone may be further performed to smooth and shine the surface. In this case, the density of the fibrous material of the base paper 40 can be increased, and the coating layer 30 to be described later can be formed more smoothly, thereby improving the printability.

(5) Coating liquid application step (S50)

The coating liquid applying step S40 of the present invention is a method of applying the coating liquid prepared in step S20 to the upper surface (i.e., printing surface) of the ground paper 40 made of paper or cloth (e.g., silk, .

The coating liquid may be mechanically performed using a coating apparatus or may be applied manually by using a brush, brush, spray, or the like. For example, the application of the coating liquid may be performed through a knife coating, a roll coating, a slot die coating, a reverse coating, or the like.

On the other hand, it is preferable to carry out a defoaming process in which bubbles are removed from the coating liquid before applying the coating liquid.

(6) Coating liquid curing step (S60)

The coating liquid curing step (S50) of the present invention is a step of drying and curing the coating liquid applied on the top surface of the ground paper 40 in step S40. The coating liquid may be dried using natural drying, thermal drying or wind drying.

When the drying of the coating liquid is completed, the water in the coating liquid evaporates, resulting in a structure in which the water-soluble resin layer 20 in which the microcapsules 10 are dispersed as shown in FIG. 3 is formed on the top surface of the base paper 40.

Example  One

<Preparation of microcapsule>

The microcapsules 10 were prepared using coacervation through pH control of an aqueous solution. Specifically, TiO ₂ / SiO ₂ 4 ml of aminoresin (melamine-formalin resin) was added to the mixed solution of the fine particles 11 and 13, and the pH was adjusted to 4.5 using acetic acid and the mixture was reacted at 60 ° C for 1 hour, (15).

In order to enhance the stability of the outer wall 15, 100 g of 0.3 wt% cysteine (L-cysteine, Aldrich) was added slowly as a crosslinking agent, and the reaction was conducted at 60 ° C for 2 hours or longer to prepare a microcapsule 10.

&Lt; Preparation and application of coating liquid &

The prepared microcapsules 10 and a liquid water-soluble resin (polyvinyl alcohol) 20 were mixed at a volume ratio of 6: 4 (that is, a microcapsule filling rate of 60%) to prepare a mixed liquid, Were mixed at a volume ratio of 1: 1 to prepare a coating solution.

The coating solution thus prepared was applied to the top surface of the base paper 40 twice, followed by drying and curing to complete the formation of the coating layer 30.

Example  2

- Same as Example 1 except that the microcapsules and the water-soluble resin were mixed in a volume ratio of 7: 3.

Comparative Example  One

- Same as Example 1 except that the microcapsules and the water-soluble resin were mixed in a volume ratio of 5: 5.

Comparative Example  2

- Same as Example 1 except that the microcapsules and the water-soluble resin were mixed at a volume ratio of 8: 2.

The printability test results of the above Examples 1 and 2 and Comparative Examples 1 and 2 are summarized in Table 1 below. The test results in Table 1 were obtained by printing the color target with a black aqueous ink for ink jet printing on the printing material produced according to Examples 1 and 2 and Comparative Examples 1 and 2. The extent of ink bleeding was visually evaluated and measured with a colorimeter GretagMacbeth Spectrolino + Spectroscan xy table, Spectro photometer) to measure the color density.

division
Degree of blur
Color density
Example 1
Satisfying requirement
1.299
Example 2
Satisfying requirement
1.273
Comparative Example 1
Under-demand
1.325
Comparative Example 2
Exceeded requirement
1.223

Test result

In the case of the printing material prepared according to the mixing ratio of the microcapsules 10 of the present invention, the degree of smearing of the ink occurred at an appropriate level as required (hereinafter referred to as "required value") (Examples 1 and 2) . Here, the 'required value' of ink bleeding refers to the degree of bleeding occurring when a liquid pigment having a medium viscosity of 500 cp or more is applied to a paper as in the case of ink, and the bleeding effect of such degree corresponds to a unique aesthetic sense of Orientalization.

This is because some of the water-soluble ink that has been jetted onto the printing material flows to the water-soluble resin layer 20 by a certain distance before being absorbed directly by the water-soluble outer wall 15, thereby causing proper bleeding of the ink.

On the other hand, when the mixing ratio of the microcapsules 10 is less than the range suggested in the present invention (Comparative Example 1), most of the water-based ink sprayed on the printing material does not flow a predetermined distance And the degree of smearing of the ink was lower than the above-mentioned required level.

When the mixing ratio of the microcapsules 10 exceeds the range suggested by the present invention (Comparative Example 2), the aqueous ink jetted onto the printing material is not directly absorbed, but flows relatively more distance, Of the total amount exceeded the above requirement.

In the case of the color density, Comparative Example 1 was the highest, Comparative Example 2 was the lowest, and Examples 1 and 2 were the intermediate values thereof. As a result, the smaller the mixing ratio of the microcapsules 10 is, the higher the color density. However, if the blending ratio of the microcapsules 10 is less than the range of the present invention, the ink bleeding is hardly generated and the bleeding effect peculiar to orientalization can not be expressed It becomes unsuitable as a printing material. On the other hand, the printing material produced according to the present invention had a relatively low color density as compared with Comparative Example 1, but a sufficient value to express the color of the original as it was.

In the case of the printing material according to the present invention, the following performance can be further realized in addition to the above-mentioned proper bleeding and color density performance.

4 is a comparative experimental example of a nano blend liquid and a macro blend liquid. The sample contained in the vial bottle on the left side of Fig. 4 is a sample prepared by forming the microcapsules 10 in an average diameter size of 120 nm, And the sample contained in the right vial bottle is a macroprolactic solution obtained by mixing a microcapsule 10 having an average diameter size of 10 mu m into a liquid resin.

As clearly shown in the comparative example of FIG. 4, the sample of the left nano blend liquid appears transparent, while the sample of the right macro mixture liquid appears opaque to white.

That is, if the microcapsules 10 are formed in a nano-size smaller than the wavelength of the visible light (preferably a nano-size smaller than 1/4 of the visible light wavelength range (400 nm to 800 nm)), a part of the visible light ray Is completely transmitted.

The coating layer 30 of the present invention is formed of the resin layer 20 in which the microcapsules 10 having an average diameter of 100 to 200 nm are mixed and thus even if the microcapsules 10 are present in the coating layer 30, The transparency can be expressed without exhibiting a specific color or opaque property, so that the above-mentioned effects (i.e., blurring control, original density representation, etc.) can be realized without hindering the color tone in printing .

On the other hand, in the microcapsules 10 dispersed in the coating layer 30 of the present invention, a large number of TiO ₂ fine particles 11 and SiO ₂ There are fine particles 13 which can reduce the light reflection problem of the conventional coating layer 30 due to these two types of fine particles.

More specifically, the index of refraction of the atmosphere is 1.0, the refractive index of the outer wall 15 is about 1.5 according to the type of resin, TiO ₂ has a high refractive index of 2.55 to 2.76, and SiO ₂ has a refractive index of 1.46 Refractive index.

Therefore, when light is incident on the coating layer 30, the light is refracted by the TiO ₂ fine particles 11 in the microcapsules 10 dispersed at 60 to 70% by volume, and then the SiO ₂ fine particles 13 The refractive index of the coating layer 30 is reduced to about 1.0, and the light reflection phenomenon of the coating layer 30 can be reduced compared with the conventional art.

While the preferred embodiments of the present invention have been described and illustrated above using specific terms, such terms are used only for the purpose of clarifying the invention, and it is to be understood that the embodiment It will be obvious that various changes and modifications can be made without departing from the spirit and scope of the invention. Such modified embodiments should not be understood individually from the spirit and scope of the present invention, but should be regarded as being within the scope of the claims of the present invention.

10: Microcapsules
11: TiO ₂ fine particles
13: SiO ₂ fine particles
15: outer wall
20: Water-soluble resin layer
30: Coating layer
40: Background paper
50: fold ground

Claims (5)

delete delete delete Preparing a microcapsule comprising a core material composed of a plurality of TiO2 fine particles and SiO2 fine particles and a transparent outer wall made of a liposoluble resin surrounding the core material and having an average diameter of 100 to 200 nm; Mixing a plurality of the microcapsules and a liquid polyvinyl alcohol at a volume ratio of 6: 4 to 7: 3 to prepare a liquid mixture; Mixing the compounding liquid and water at a volume ratio of 1: 1 to 1: 2 to prepare a coating solution; Attaching a folded ground to the lower surface of the paper; Coating the coating liquid on the upper surface of the paper to form a transparent coating layer; And drying and curing the transparent coating layer,
Wherein the step of preparing the microcapsules comprises:
Amino resin was added as the oil-soluble resin to the mixed solution of the TiO 2 fine particles and SiO 2 fine particles and the pH was adjusted to 4.5 by using acetic acid. The mixture was allowed to react at 60 ° C. for 1 hour to perform the phase separation of the aminoresin To form the transparent outer wall; And
Adding 0.3 wt% of L-cysteine to the reaction mixture at 60 DEG C for 2 hours or more.
5. The method of claim 4,
Further comprising the step of heat treating the ground paper with the folded ground to a hot plate and rubbing the ground paper with a steel material.

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