KR100478534B1 - The process of manufacture to be used as a white board as well as printing paper - Google Patents

Abstract

A printing paper with a white board function and a process of manufacturing the same are provided to have a printing paper itself provided with the function of writing and erasing over and over again using a water board marker without a coating step. The printing paper comprises: a base layer(1) made of a paper or plastic sheet or a plastic film; a primer adhesive layer(2) formed on the base layer and made of at least one selected from the group consisting of polyurethane resin, polyacryl resin and polyurethane acryl resin; and a water soluble polyvinyl alcohol(PVA) coating layer(3) having a coating thickness of 1 to 30 micro-meter formed on the primer adhesive layer.

Description

Output paper with white board function and its manufacturing method {The process of manufacture to be used as a white board as well as printing paper}

The present invention relates to an output paper with a white board function and a method for manufacturing the same, and more specifically, it can be used like a white board, and can be used for a general or color inkjet printer and a large format printer capable of outputting various images and formats. The present invention relates to an output paper and a method of manufacturing the same, which is provided with a function of writing and erasing using an aqueous board marker pen and the like before and after outputting a paper, such as a white board.

Paper output paper, which is a common output paper of conventional general or color inkjet printers and large format printers (plotters), has low durability, tears well, short life cycle, and smearing of ink, which makes it impossible to reproduce delicate colors and has no gloss. The printing effect tends to be poor.

To overcome these shortcomings, to produce high-quality output paper that can print vivid colors, fine lines, colorful images, does not tear or wrinkle easily, and does not cause scratches after printing. Research has been carried out.

For example, Korean Patent No. 279057 discloses a soft translucent PVC coating as a dust remover on the back surface of a fabric made of about 0.1 mm and a thickness of 0.2 mm between a yarn hanol and a hanol, and acetic acid on the output surface of the fabric paper. A method for producing an output paper for a color ink jet printer obtained by mixing a vinyl resin solution and a fluorescent white dye and then coating the CMC as a moisture barrier and an adsorbent first and secondly is described.

However, such a dedicated paper also has no coating effect, so it is cumbersome to use a separate coating paper for further explanation as a briefing material for output.

Therefore, general and color inkjet output papers made in the prior art are capable of outputting images and forms, but there is no function to freely write and erase thereon, and there is an inconvenience in that a separate coating is required for this purpose.

Most of the output papers produced by such a conventional technology are simply output papers having a function of outputting an image or a form using a general and color inkjet printer.

The white board can be written and erased using an aqueous board marker.

It means a plate that can be written.

Looking at the related art related to this technology, for example, Korean Patent No. 160375 has a simple manufacturing process, good handling properties such as transportation and cutting, excellent wear resistance, matteness, paintability, erasability, etc. Is bonded to the adhesive and can be used anywhere, and can be used anywhere, roll coating coating and continuous bake-drying polyester film is coated with a dry film thickness of 10 to 20㎛ to dry the heated bake, and the polyester The coating film for blackboards manufactured by apply | coating and drying a heat resistant adhesive agent at 20-200 micrometers on the back surface of a film, and then bonding a release paper is described.

In addition, Korean Laid-Open Patent No. 2000-8143 forms a white board by using a material such as plastic, paper, or cloth to reduce the weight of a thin plate, thereby facilitating transportation and storage, and greatly reducing production costs, and without any parts. A white board is described which can be easily attached and used, and can be cut and used for various purposes. The white board forms an adhesive layer which is protected by a release paper on the back surface of a thin plate made of paper, plastic, cloth, etc., and a coating layer of a hardened surface is formed on the front surface by coating. The Korean Laid-Open Patent No. 2000-8143 relates to a thin plate light weight white board, and is a technology related to a thin plate light weight of a simple white board in which a printing output function is not considered at all.

Therefore, the present inventors improve the disadvantages of conventional printing papers for general and color inkjet printers, while providing convenience and excellent quality to consumers, and repeatedly writing and erasing only with the paper itself without performing a separate coating step. Therefore, as a result of research and development to develop an output paper having an adhesive function, a primer as an adhesive reinforcing material is selected for various substrate layers (plastic sheet, film or paper), and PVA (poly vinyl alcohol) or modified (water-soluble resin) PVA was selected to develop output paper for general and color inkjet printers with whiteboard capability.

Accordingly, an object of the present invention is to improve the disadvantages of conventional output paper for general and color inkjet printers, while providing excellent print quality, without using a separate coating step, iteratively using an aqueous board marker pen by itself. The present invention provides an output paper having a writing and erasing function and a manufacturing method thereof.

In order to achieve the above object, the output paper to which the white board function according to the present invention is added comprises: a base layer composed of paper or plastic sheet or plastic film; A primer adhesive layer formed of a primer composed of at least one selected from the group consisting of a polyurethane resin, a polyacrylic resin, and a polyurethaneacrylic resin on the substrate layer; A water-soluble polyvinyl alcohol (PVA) coating layer having a coating thickness of 1 to 30 μm on the primer adhesive layer; Characterized in that it comprises a.

Here, it is preferable that the said primer adhesion layer is formed by coating the primer of 1 to 5 weight% solid content by the application amount of 1-3 g / m <2>.

The water-soluble polyvinyl alcohol (PVA) coating layer has a solid content of 5 to 20% by weight, a weight average molecular weight of 800 to 3,000, a saponification degree of 80 to 99 mol%, and a mole fraction of cationic group of 0.1 to 10 mol%. It is preferably formed by coating water-soluble polyvinyl alcohol (PVA).

In addition, on the back of the base layer,

Primer consisting of at least one selected from the group consisting of polyurethane resin, polyacrylic resin, and polyurethane acrylic resin aqueous solution, 1 to 5% by weight of the solid primer, 2 to 5g / ㎡ applied amount of the primer primer adhesive layer ;

Secondary paper attached to the adhesive layer (Fuji) and;

May be additionally included.

In order to achieve the above object, the manufacturing method of the output paper to which the white board function according to the present invention is added,

On the base material layer of paper, a plastic sheet or a plastic film, 1 to 1 or more primers containing at least one selected from the group consisting of polyurethane resin, polyacrylic resin, and polyurethaneacrylic resin aqueous solution and having a solid content of 1 to 5% by weight. Coating with a coating amount of 3 g / m 2 and drying to form a primer adhesive layer; And a water-soluble PVA coating layer having a solid content of 5 to 20% by weight, a weight average molecular weight of 800 to 3,000, a saponification degree of 80 to 99 mol%, and a mole fraction of a cationic group of 0.1 to 10 mol% on the primer adhesive layer. Forming a coating thickness of 30 μm; It includes.

At this time, the forming step of the water-soluble PVA coating layer,

PVA, acetyl group-modified PVA, carboxyl group-modified PVA, and silane-modified PVA, including at least one selected from the group consisting of 4-20% PVA aqueous solution; Metal methacrylate, ethyl acrylate, a monomer having a cationic group (dimethyl amino ethyl (meth) acrylate, diethyl amino ethyl (meth) acrylate, dimethyl amino ethyl (meth) acrylamide, etc.) 10: 10: Copolymerization copolymer in a molar ratio of 1; And dissolving in a 1: 1 solvent of water and ethanol relative to a polymer concentration (solid content) to provide a coating agent, and applying the coating agent on the primer adhesive layer to dry it.

The monomer having the cationic group is preferably selected from the group consisting of dimethyl amino ethyl (meth), acrylate, diethyl amino ethyl (meth) acrylate and dimethyl aminoethyl (meth) acrylamide, respectively.

Moreover, on the back of the base layer,

Adhesion in the form of a removable by applying a primer having a solid content of 1 to 5% by weight in a coating amount of 2 ~ 5g / ㎡ comprising at least one selected from the group consisting of a polyurethane resin, a polyacrylic resin, and a polyurethane acrylic resin aqueous solution After forming the layer, the method may additionally include attaching the secondary paper (fuji).

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a schematic view of the output paper according to the present invention, the output paper according to the present invention is composed of a base material layer (1) primer adhesive layer (2) and a water-soluble PVA coating layer (3),

2 is composed of a base material layer (1) primer adhesive layer (2), a water-soluble PVA coating layer (3), a removable adhesive layer (4), and a secondary paper (fuji) paper 5.

The substrate layer 1 may be selected from paper, plastic sheet or plastic film.

In the present invention, the paper is a generic name consisting of paper such as thin paper, high-gloss paper, base paper, the plastic sheet is a total thickness of the plastic raw material such as polyethylene terephthalate (PET), polyethylene, polypropylene, polystyrene, nylon 300 It means the case within the μm, and the plastic film means the total thickness of the plastic raw material is less than 300 μm. The plastic sheet and the film are applicable to both transparent or white.

The PET raw material is a PET film obtained by condensation polymerization of ethylene glycol and terephthalic acid, and extrusion of the PET raw material from a T-DIE extruder to biaxial stretching. PET film or sheet has excellent heat resistance, dimensional stability, durability, etc., and is very suitable for inkjet printing paper.

In addition, general PET has excellent mechanical (high tensile strength, elastic modulus), chemical, electrical, and optical properties, and thus is widely used in food packaging materials and industrial applications.

The PP film is extruded in a T-DIE extruder and biaxially stretched using the high crystallinity of PP. Such films and sheets are suitable as substrates for inkjet printing papers because of their rigidity, moderate strength and heat resistance, chemical resistance and oil resistance.

Nylon film is biaxially stretched by extrusion in a T-DIE or BLOWN type extruder, and excellent in heat resistance, toughness and dimensional stability, and is suitable as a substrate for inkjet printing paper.

In addition, most plastics such as polyethylene, polystyrene, and polyvinyl chloride are suitable as substrates for inkjet printing paper.

In addition, the white plastic sheet or film is produced by prescribing a small amount of titanium dioxide (TiO ₂ ) as a raw material.

In this invention, although the thickness of the said base material layer 1 is not specifically limited, About 0.03-0.2 mm is preferable.

In the present invention, since the base layer and the water-soluble PVA coating layer do not adhere to each other by thermal bonding or the like, a primer adhesive layer is used to enhance the adhesive strength of both layers.

On the said base material layer 1, the primer adhesion layer 2 comprised from primer resin is formed. The primer resin is composed of at least one selected from the group consisting of polyurethane resins, polyacrylic resins, and polyurethane acrylic resins.

Specifically, the primer adhesive layer 2 is formed by coating the primer having a solid content of 1 to 5% by weight with a coating amount of 1 to 3 g / m ² , and then evaporating and drying the liquid water through a drying hood.

It is preferable that the solid content of the resin is 1 to 5% by weight, but if the content of the solid content is less than 1% by weight, there is a problem that the adhesion between the base layer and the coating layer is lowered. This tends to be excessive.

In addition, the method of liquid-coating the primer layer 2 on the base material layer 1 is not particularly limited, and is applied by a gravure, key coater, dipping method, spray coater, comma method, die coater, slide bit method or the like. can do. The coating amount of the primer resin is preferably 1 to 3 g / m ² , and when the coating amount is less than 1 g per unit area (m 2), there is a problem that the adhesion between the base layer and the coating layer is lowered. There is a problem in that the adhesive strength is poor.

In addition, the drying hood usually has a drying chamber chamber length of 5 ~ 50M, has a constant temperature gradient from the inlet, for example, drying while gradually increasing the temperature to the inlet 50 ℃, 70 ℃, 90 ℃, 120 ℃ and 140 ℃ Let's go. This is because only the outer surface is dried when heated too high at the beginning, and the inside of the primer layer is not dried well, so that a uniform and homogeneous fixing layer is not formed. Therefore, the temperature of the drying hood is preferably adjusted to have a constant temperature gradient within the temperature range of approximately 50 ~ 140 ℃ to be gradually heated.

The water-soluble PVA coating layer 3 having a solid content of 5 to 20% by weight is formed on the primer adhesive layer 2 thus obtained with a coating thickness of 1 to 30 µm.

The coating and drying method of the water-soluble PVA coating layer 3 may be performed in the same manner as the coating and drying method of the above-described primer adhesive layer. In addition, when the thickness of the water-soluble PVA coating layer (3) is less than 1㎛ decreases the printability, writing and erasing function of the output paper, if it exceeds 30㎛, the output paper absorbs a large amount of moisture during long-term use, the strength of the paper Falls.

The forming step of the water-soluble PVA coating layer 3 is as follows.

1) One or more PVA resins are selected from the group consisting of PVA, acetyl group-modified PVA, carboxyl group-modified PVA, and silane-modified PVA, and prepared in an aqueous PVA solution at a concentration of 4-20%.

2) A copolymer is prepared by copolymerizing a monomer having methyl methacrylate, ethyl acrylate, and a cationic group in a molar ratio of 10: 10: 1.

3) Dissolve 1) and 2) above in a 1: 1 solvent of water and ethanol to obtain a coating agent.

In this invention, 5-20 weight% of solid content of a water-soluble PVA coating layer is preferable, and adjusts the component amounts of said 1) and 2) accordingly. If the solid content is less than 5% by weight, the PVA coating amount may be too small. If the solid content is more than 20% by weight, the PVA coating amount may be excessively overcoated.

In addition, in the above 2), the acrylic copolymer is a soft polymer resin which is insoluble in water and high in water absorption, and is preferably cationic and contributes to the antistatic property of the surface. In the present invention, the molar fraction of the cationic group is preferably 0.1 to 10 mol%, and the effect is insignificant if the molar fraction of the cationic group is less than 0.1 mol%. If the molar fraction is more than 10 mol%, the adhesive strength of the polymer and the performance of the film are lowered. There is a problem. Examples of the monomer having a cationic group include dimethyl amino ethyl (meth) acrylate, diethyl amino ethyl (meth) acrylate, dimethyl aminoethyl (meth) acrylamide and the like.

In addition, the PVA aqueous solution has a weight average molecular weight of 800 to 3,000 and a saponification degree of 80 to 99 mol%, preferably 80 to 99 mol%.

When the weight average molecular weight of the PVA is less than 800, the PVA coating film strength is weakened, and when the weight average molecular weight of the PVA is more than 3,000, the solubility of PVA in water is inferior. If the degree of saponification is less than 80 mol%, the solubility is good, but the water resistance, solvent resistance, and blocking resistance are lowered. If the degree of saponification is more than 99 mol%, the hydrophilicity is lowered, and the drying time of the coating film becomes longer.

Since the coated PVA layer has excellent solvent resistance and poor water resistance, it does not dissolve or swell when using water-based macaphene (water that does not enter the macapen) on inkjet paper. . In contrast, the coated PVA has a low WET TENSION, making it easy to erase written text.

On the other hand, the removable primer adhesive layer applied to the back surface of the base layer, including at least one selected from the group consisting of polyurethane resin, polyacrylic resin, and polyurethane acrylic resin aqueous solution having a solid content of 1 to 5% by weight It is made by applying a primer at a coating amount of 2 to 5 g / m 2. If the content of the solid content is less than 1% by weight, there is a problem in that the adhesion between the base layer and the coating layer is lowered. If the content of the solid content exceeds 5% by weight, the viscosity tends to be too high and the adhesive force tends to be excessive. In addition, the coating amount of the removable primer adhesive layer 4 is preferably 2 to 5 g / m ² , and when the coating amount is less than 2 g per unit area (m 2), the adhesive force between the base layer 1 and the Fuji 5 to be described later is There exists a problem of being small, and when it exceeds 5 g, there exists a problem of the adhesive force of a base material layer and Fuji falling similarly.

The method of applying the liquid primer coating layer 4 on the substrate layer 1 in a liquid phase is not particularly limited, and a gravure, a key coater, a dipping method, a spray coater, a comma method, a die coater, a slide bit method, or the like is used. It is available.

In addition, the secondary paper (Fuji) 5 may be uniformly attached on the removable primer adhesive layer (4).

The output paper according to the present invention may replace an existing white board in a situation room, a conference room, a seminar room, a lecture room, or the like, and may be freely written and erased with an aqueous board marker. In addition, there is no need to coat separately to give writing and erasing functions.

In addition, as a dedicated paper such as black and white, color, photo inkjet, etc., it is glossy, there is no bleeding of ink, and delicate color expression and uniform printing are possible. It is also possible to produce and sell in roll state or A4 or A3 paper.

Therefore, it is a white board that is easy to carry and handle and easy to carry, and is applicable to various fields because it is an output paper for general and color inkjet printers and large format printers (plotters). For example, during the military operation, the map of the operation area may be output to the plotter, and the operation paper may be freely explained using the water-based marker marker pen, and may include Chinese characters, English words, arithmetic problem papers, and multiplication tables. It is useful as a supplementary learning tool because the printed paper can be printed out and written and erased while freely explaining the printed paper. In addition, products made of non-torn materials are durable and are advantageous for long-term storage when used for printing documents, photographs, or forms for long-term storage.

EXAMPLE

Prepare a sheet of PP (including OPP) with a thickness of 30 to 200 μm, coat 5 wt% polyurethane resin primer on the sheet with an application amount of 1 g / m 2, and pass through a drying hood to dry according to a predetermined temperature gradient. A primer adhesion layer was formed. A water-soluble PVA coating layer having a solid content of 10% by weight on the primer adhesive layer was formed with a coating thickness of 5 ~ 20㎛. A map was printed on the obtained paper using a color inkjet printer, and the surface of the printed matter was written with an aqueous board marker (without water) and then easily erased with a tissue or a cloth or a white board eraser. Even after repeated writing, the printed map image remained intact, and the printed map also showed excellent printability with vivid lines and colors.

At this time, the water-soluble PVA resin having a solid content of 10% by weight

1) 900 g of 10% by weight PVA aqueous solution,

2) 10: 10 of methyl methacrylate, ethyl acrylate, monomer with cationic group (dimethyl amino ethyl (meth) acrylate, diethyl amino ethyl (meth) acrylate, dimethyl amino ethyl (meth) acrylamide) 100 g of copolymer copolymerized by the general method at a molar ratio of 1

3) 1) 1), 2) was mixed in a 1 to 1 weight ratio of water and ethanol mixed solvent, using an exchanger was prepared by mixing at 1000 RPM for 30 minutes.

As described above, the printer output paper which can be used like the white board obtained by the present invention and which can output various images and forms not only has excellent printability, but the output paper itself can be freely written and erased while being carried and Ease of handling can provide convenience for use as a whiteboard replacement.

In addition, according to the present invention, since the function of writing and erasing and adhesion can be combined with only the output paper itself without using a separate coating or adhesive, education, training activity, situation transmission, various presentation activities, exhibitions, In all these areas, such as simple photo printing, it can be easily and conveniently used in the form desired by the consumer, so that it can be easily applied to consumer demand.

In addition, the conventional output papers are almost made of paper, so that it is difficult to recycle and torn well by combining with the ink after output, the output paper obtained by the present invention can be produced with a plastic sheet and a plastic film When used, it provides eco-friendly recycled output paper, and it is easy to store and use because it does not tear well.

In addition, the conventional paper output paper is difficult to be processed and used because it is easily torn during repeated detachment when the adhesive treatment on the back side, the output paper according to the present invention using the durable plastic sheet or film to give the adhesive function It is easy and does not tear even if it is repeatedly attached and detached.

In addition, the present invention does not take the hassle and excessive equipment cost of manufacturing production because the composition is mixed to enable production by applying to all the various manufacturing equipment.

In addition, the existing output paper has a difficulty in storage due to discoloration or color deformation when stored for a long time, the output paper according to the present invention can be stored for a long time to prevent such discoloration and color change.

1 is a schematic diagram schematically showing a side cross-sectional view of a printer output paper, to which a white board function according to an embodiment of the present invention is added.

Fig. 2 is a schematic diagram schematically showing a side sectional view of a printer output paper to which a white board function according to another embodiment of the present invention is added.

<Description of the symbols for the main parts of the drawings>

1 ... substrate layer

2 ... primer adhesive layer

3. Water soluble PVA coating layer

4 ... 2 Paper Feed (Rear Paper)

5.Removable adhesive layer

Claims (8)

delete A base layer composed of paper or plastic sheet or plastic film; A primer adhesive layer formed of a primer composed of at least one selected from the group consisting of a polyurethane resin, a polyacrylic resin, and a polyurethaneacrylic resin on the substrate layer; A water-soluble polyvinyl alcohol (PVA) coating layer having a coating thickness of 1 to 30 μm on the primer adhesive layer; It is configured to include, The primer adhesive layer, the output paper with a white board function, characterized in that formed by coating a primer of 1 to 5% by weight solid content of 1 to 3g / ㎡. The method of claim 2, The water-soluble polyvinyl alcohol (PVA) coating layer is a water-soluble poly having 5 to 20% by weight of solid content, 800 to 3,000 weight average molecular weight, 80 to 99 mol% saponification degree, and 0.1 to 10 mol% cationic group mole fraction. Output paper with a white board function, characterized in that formed by coating vinyl alcohol (PVA). The method according to claim 2 or 3, On the back of the base layer, Primer consisting of at least one selected from the group consisting of polyurethane resin, polyacrylic resin, and polyurethane acrylic resin aqueous solution, 1 to 5% by weight of the solid primer, 2 to 5g / ㎡ applied amount of the primer primer adhesive layer ; Secondary paper attached to the adhesive layer (Fuji) and; Output paper with a white board function, characterized in that it further comprises. delete On the base layer of paper or plastic sheet or plastic film, 1 to 1 primer containing at least one selected from the group consisting of polyurethane resin, polyacrylic resin, and polyurethaneacrylic resin aqueous solution and having a solid content of 1 to 5% by weight. Coating with a coating amount of 3 g / m 2 and drying to form a primer adhesive layer; A water-soluble PVA coating layer having a solid content of 5 to 20% by weight, a weight average molecular weight of 800 to 3,000, a saponification degree of 80 to 99 mol%, and a molar fraction of a cationic group of 0.1 to 10 mol% on the primer adhesive layer is 1 to 30. Forming a coating thickness of μm; Forming the water-soluble PVA coating layer, PVA, acetyl group-modified PVA, carboxyl group-modified PVA, and silane-modified PVA, including at least one selected from the group consisting of 4-20% PVA aqueous solution; Metal methacrylate, ethyl acrylate, a monomer having a cationic group (dimethyl amino ethyl (meth) acrylate, diethyl amino ethyl (meth) acrylate, dimethyl amino ethyl (meth) acrylamide, etc.) 10: 10: Copolymerization copolymer in a molar ratio of 1; And dissolving in a 1: 1 solvent of water and ethanol relative to a polymer concentration (solid content) to provide a coating agent, and applying the coating agent onto the primer adhesive layer to dry it. Method for producing added output paper. The method of claim 6, The monomer having the cationic group is selected from the group consisting of dimethyl amino ethyl (meth), acrylate, diethyl amino ethyl (meth) acrylate and dimethyl aminoethyl (meth) acrylamide, respectively. Method of producing output paper with added function. The method according to claim 6 or 7, On the back of the base layer, Adhesion in the form of a removable by applying a primer having a solid content of 1 to 5% by weight in a coating amount of 2 ~ 5g / ㎡ comprising at least one selected from the group consisting of a polyurethane resin, a polyacrylic resin, and a polyurethane acrylic resin aqueous solution And forming a layer, and then attaching two sheets of paper (fuji).