JP2657343B2 - Method of manufacturing patterned net for transparent paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a transparent paper-like pattern net. For more information, see-through paper manufactured for security purposes such as securities paper
Also, the present invention relates to an efficient method for producing a pattern net that can be used for producing any of "patterned transparent paper" produced for the purpose of enhancing the design effect.

[0002]

2. Description of the Related Art As a typical method for producing a pattern paper by a circular cylinder of a circular paper machine or a dandy roll of a fourdrinier paper machine, a bamboo cage or a gold cage is converted into a circular cylinder or a dandy roll. A method of transferring the pattern of winding and basin eyes. A method in which a pattern net is drawn using paint and attached to the upper net of a circular cylinder cylinder or dandy roll to make a paper and give a see-through pattern. A method of cutting out a pattern with paper, film, a metal plate, etc., making a pattern net pasted on the upper net of a circular cylinder cylinder or dandy roll, and giving a transparent pattern. There is a method in which a pattern is formed on the wire net itself with irregularities and used as an upper net.

In the method using a bamboo cage or a gold cage, since a cage having a specific thickness is knitted at a constant interval, it is easy to form a linear pattern at an equal interval. However, there is a defect that the length cannot be changed arbitrarily and a curved pattern cannot be obtained. The method of making a pattern net using the above paint requires enormous labor, time and a high degree of skill, and has a drawback that it is difficult to change the height of the pattern by raising the paint. The method of cutting out a paper, a film, a metal plate or the like and sticking it on a net, and the method of forming irregularities on a wire net also have disadvantages that require a high degree of skill and an enormous amount of time.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems. That is, an object of the present invention is to produce a pattern net for transparent paper efficiently with excellent durability.

[0005]

The gist of the present invention will be described with reference to the drawings.
The original S having the pattern 2 formed thereon is adhered to a woven fabric, a metal plate, a film, a pattern, etc., the release sheet 4 is adhered to the back surface, and the resin 5 having good adhesion to the papermaking net 3 and water resistance is applied. Original S
After rubbing with a squeegee 6 or the like, filling the voids of the papermaking net 3 under the pattern portion 2 of the original S with the resin 5, removing the original S, drying and solidifying the resin, and repeating this operation one or more times. An object of the present invention is to release a release sheet and produce a see-through pattern net. In addition, the pattern 2 of the present invention means a number, a character, a pattern, a straight line, a curve, a mark-shaped pattern, or the like.

Hereinafter, the present invention will be described in detail. The woven fabric used when producing the master S is usually 40 to 150 μm in yarn diameter.
m, natural fibers such as cotton, cotton, hemp, synthetic fibers such as polyamide, polyester, polyacryl, rayon, copper,
It is manufactured by using a thin metal wire such as brass, bronze, stainless steel, etc., and performing plain weave, twill weave, satin weave, etc. with a weaving machine, and usually weaving at 50 to 250 mesh / inch. Metal plates and films usually have a thickness of 20 to 2 mm.
00μm iron plate, copper plate, stainless plate or polyester,
Films of polyamide, polyvinyl chloride, polyolefin, etc. can be used. As the paper pattern, paper, paper or Japanese paper having a thickness of 40 to 200 μm, which is obtained by coating or impregnating persimmon juice or a synthetic resin on a nonwoven fabric can be used.

As a means for forming the pattern 2, in the case of a woven fabric, a plate-making technique for screen printing can be used as it is. That is, either a hand-crafted plate making method of directly drawing a pattern by hand using a brush or the like or a mechanical plate making method using a photosensitive resin can be used. In this case, portions other than the pattern portion are filled with resin or the like.

In the case of a metal plate, a film, or a pattern, a pattern is formed using chemical etching, a pattern is punched using a sharp blade, or a pattern is burned using a laser. It is formed by things and the like.

As shown in FIGS. 1 to 4, the release sheet 4 has good adhesion to the pattern net and prevents the water-resistant resin 5 from protruding outside the pattern portion, and the resin is dried and solidified. It is used for the purpose of peeling after the release, and a release sheet obtained by applying a release agent to paper or film is used. Therefore, it is necessary to select a release agent that does not adhere to the resin 5.

As the pattern net 3, any pattern net used in the paper making process can be used. That is, the normal wire diameter is 100 to 1
Using a thin wire of 000 μm phosphor bronze wire, brass wire, stainless steel, polyester, polyamide, etc., weave it with a weaving machine, plain weave, long crimp weave, monoprene weave, etc. and usually weave at 4 to 120 mesh / inch. .

As shown in FIGS. 2 and 3, an original S is superimposed on the surface of the pattern mesh 3 and a resin 5 having good adhesion to the pattern mesh and having water resistance is applied to the non-image area 1 on the original. Hanging squeegee
The resin 5 used in the step of rubbing with 6 or the like and filling the voids of the pattern mesh under the pattern portion 2 of the original with the resin 5 is strongly adhered to the pattern mesh, has excellent water resistance, and has excellent physical strength. It is necessary to be. As the resin 5, NBR, SBR,
MBR rubber resin, epoxy resin, silicone resin,
Thermosetting resin such as polyurethane resin, urea resin, phenol resin, polyvinyl chloride resin, polyvinyl acetate resin,
A single or a mixture of thermoplastic resins such as polyolefin resins is used. According to the results examined by the present inventors,
Particularly, epoxy resin, silicone resin and polyurethane resin gave excellent results.

Next, the original S is removed, and the resin 5 is dried and hardened as shown in FIG.

If necessary, furthermore, the same master is overlapped in synchronism with the pattern of the pattern mesh, the resin is dropped on the master, rubbed with a squeegee or the like, and the resin is stacked on the pattern portion and dried and cured. Repeat several times.

Next, the release sheet 4 is peeled off to complete the pattern net for transparent paper of the present invention.

[0015] A transparent paper can be produced by attaching the pattern net produced in this manner as a net cylinder of a net paper machine or an upper net of a dandy roll of a fourdrinier machine, and making the paper according to a conventional method.

[0016]

【Example】

Example. 1 (1) Manufacture of a composition An original having a continuous tone floral pattern was photographed with a suspension camera (disassembled into halftone dots using a contact screen), and a composition was manufactured using a lith film. (2) Manufacture of master plate A T-NO type polyester filament having a wire diameter of 150 μm was used, a tension of 28 N / cm was set, and a 60-mesh plain weave screen was prepared. Then, in order to make the emulsion adhere well to the screen, the screen was sufficiently degreased and washed with a 1% aqueous sodium hydroxide solution, washed with water, and dried. Then, the photosensitive emulsion (trade name "Fuji Screen Coat M", manufactured by Fuji Pharmaceutical Co., Ltd.) was diluted with water, left for 24 hours in a cool dark place for defoaming, and then applied over the entire screen using a bucket. First, it was applied once for filling and dried with warm air of about 40 ° C. Next, this operation was repeated four times to form a photosensitive layer having a thickness of about 15 μm. The coating operation was performed in a clean room free from dust that causes pinholes, and a yellow fluorescent lamp was used for indoor lighting. The plate was then placed on a screen coated with a photosensitive emulsion, and exposed using an ultra-high pressure mercury lamp (distance 1 m, output 4 kw for 2 minutes). Development is at a pressure of 4 kg / cm ²
Was sprayed to completely elute the unexposed portions of the photosensitive emulsion. Next, a urethane-based treating agent was applied to both sides of the screen with a brush for a curing treatment, left for 5 minutes, washed with water, and dried. The master produced in this way is a so-called "negative" master in which the photosensitive resin is embedded in portions other than the floral pattern. (3) Manufacture of pattern net for transparent paper The original plate manufactured by the above-mentioned method was overlaid on a 70 mesh / inch bronze monoprene woven paper net as shown in FIG. A release sheet was set below the papermaking net so that the release surface was in contact with the papermaking net. The release sheet used was release paper having a thickness of 100 μm and subjected to single-sided silicon treatment. Next, a two-part curable epoxy resin adjusted to a viscosity of 2000 cps (trade name "Araldite", manufactured by Nagase Chiba Co., Ltd.)
Was dropped on the original plate as shown in 5 of FIG. 2 and rubbed with a squeegee to fill the gaps of the papermaking net with resin. Then, the original plate was removed as shown in FIG. 4 and left until the epoxy resin surface had no tackiness. In the case of standing at room temperature, tackiness disappears in about 4 hours. When forcedly cured with hot air at 100 ° C., a similar state can be obtained in about 0.5 hour. In order to use the master repeatedly, the resin adhered to the master was removed by washing with a solvent. This is the reason why the pattern net for the transparent paper is made, but because the gradation is poor at one time, the same original is used, and the resin is dropped on the original in synchronization with the paper making net pattern. It was rubbed with a squeegee and the resin was overlaid on the pattern. This operation was repeated three times, and 0.3
A pattern net for a transparent paper having a picture pattern having a height of mm was manufactured.

Embodiment 1 2 The pattern net produced in Example 1 was attached to the surface of a net cylinder of a net paper machine, and the basis weight was 110 g / m2 with the following stock.
^Two transparent patterned papers were produced. 150kg LBKP ... 390kg (Bending degree: 450cc CSF) Rosin sizing agent (trade name "SPN700", manufactured by Arakawa Hayashi San Kagaku Co., Ltd.) ... 7.2kg starch (product) Name "Amicol", manufactured by Nisseki Chemical Co., Ltd.)
... 3 kg dye (manufactured by Bayer Corporation) LEVACELL FAST YELLOW GFN
(L): 0.02% vs. pulp LEVACELL FAST BLACK G: 0.002% vs. pulp Fixing agent (sulfuric acid band): 30 kg As a result, complicated flowers with subtle irregularities were expressed A sheer patterned paper with a pattern was obtained.

Embodiment 1 3 The pattern net produced in Example 1 was attached as an upper net of a dandy roll of a fourdrinier paper machine. With the same stock formulation as in Example 2, a dandy roll is pressed against a paper web on a papermaking net to give a see-through pattern, dried by a cylinder dryer according to a conventional method, and a see-through pattern having a basis weight of 120 g / m ^2. I got the paper.

[0019]

As described above, the patterned net for transparent paper of the present invention is manufactured, and is attached to a circular cylinder or a dandy roll of a fourdrinier paper machine so that the transparent paper can be made more efficient than the prior art. Can be manufactured. Characters in the pattern,
A transparent paper that can be suitably used as anti-counterfeit paper can be manufactured by forming a mark or the like, and a very design effect can be obtained by forming the pattern portion with a picture pattern, a raid pattern, a marble pattern, a leather pattern, a woven pattern, or the like. It is possible to produce a transparent paper with excellent transparency.

[Brief description of the drawings]

FIG. 1

FIG. 5 is an explanatory diagram of a manufacturing process of the pattern net for transparent paper of the present invention.

[Explanation of symbols]

 S Original 1 Non-patterned part 2 Patterned part 3 Paper making net 4 Release sheet 5 Resin 6 Squeegee

Claims (1)

(57) [Claims] 1. An original plate S on which a pattern 2 is formed is brought into close contact with the surface of a papermaking net 3, and a release sheet 4 is brought into close contact with the back surface. After hanging on the original plate and rubbing with a squeegee 6, filling the voids of the papermaking net below the pattern portion 2 of the original plate with the resin 5, removing the raw material, drying and solidifying the resin, and repeating this operation at least once,
A method for producing a see-through paper-like pattern net, comprising releasing a release sheet.