JPH0686719B2 - Method for producing transparent paper - Google Patents

Description

Detailed Description of the Invention a. OBJECT OF THE INVENTION [Industrial field of use] The present invention relates to a method for producing a show-through paper.

[Prior Art] Conventionally, as for see-through, (1) a pattern shape such as a design or letter is attached to the upper net of a cylinder cylinder or a dandy roll, or (2) the mesh of the pattern is filled with resin or the like. (3) It has been carried out by embossing a pattern on the net itself.

In the methods (1) and (2), the mesh of the pattern-shaped portion is blocked, and the passage of the paper stock is suppressed. As a result, a paper layer is not formed in that portion, or even if it is formed, the portion becomes thin, so that a see-through pattern appears.

In this case, if the size of the mesh closed by the pattern becomes significantly larger than the fiber length, holes will be formed in the paper layer, which is a practical problem.

In order to prevent perforation, it is necessary to limit the shape, size, distribution, etc. of the pattern, or to perform multi-layer papermaking.

Further, the work of creating this pattern shape and attaching it to the net, or painting the mesh of the net according to the pattern requires a very high level of skill and skill, and the production time required for it is enormous.

Japanese Patent Publication 47-12202, Japanese Publication 49-21248, Japanese Publication 54-24483
The proposals found in Japanese Patent Publication No. 54-28486 and Japanese Patent Publication No. 54-28486 are intended to improve such difficulties, and to make a pattern or a paper net with a pattern easily by using a photosensitive resin. is there.

In the method of (3), the pattern is stamped out as unevenness of the net and the mesh is not blocked. The see-through pattern appears due to the difference in drainage due to the height and depth of the unevenness of the net, the angle of the slope, and the like.

Therefore, the method (3) is better than the methods (1) and (2).
It is excellent in so-called gradation, which expresses the subtle difference in shades of the transparent pattern, and there is little risk of perforations where there are no fibers, and there are few restrictions on the design of the transparent pattern.

However, the production of the net for see-through of the method of (3) is (1),
(2) More advanced skills and skills are required. In addition, the uneven pattern of the net itself is easily deformed or damaged during papermaking.

The above-mentioned transparent paper is to create a transparent pattern by making the fiber distribution coarse and dense in the papermaking process, but unlike this,
Print any pattern with transparent resin (Japanese Patent Publication No. 50-
3802), there is also a proposal to obtain a pattern of a see-through style by incorporating a resin whose portion becomes transparent by hot pressing (JP-A-61-275500).

In addition, Japanese Patent Publication Nos. 47-7725 and 49-12846 propose a method for producing a see-through paper having a deep concave and convex pattern using a long wire with a pattern. Since it rotates while contacting a large number of rolls while receiving a high tension, there is a problem in wear of the expensive patterned wire and running stability of the wire.

[Problems to be Solved by the Invention] The production of a conventional pattern net requires a very high level of skill and skill, which has been a problem in that it impedes the mass production of the transparent paper.

Further, it takes a huge amount of time to manufacture a pattern net by the conventional technique, which causes a problem of increasing the cost of the transparent paper.

In the method described in "Prior Art", in which (1) a pattern type such as a pattern or letter is attached to the upper net, or (2) the mesh of the pattern is filled with resin, the mesh is blocked. The design of the see-through pattern is restricted in order to prevent punctures that are likely to occur due to Further, the so-called gradation, which expresses a slight difference in shade of the see-through pattern, is insufficient.

Although (3) the method of embossing a pattern on the net itself as described in "Prior Art" is superior to the methods of (1) and (2) in terms of perforation and gradation, The uneven pattern of the net itself is apt to be deformed or damaged during papermaking.

B. Structure of the Invention "Means for Solving Problems" The present invention provides a method for economically producing a see-through paper which is excellent in gradation and in which designs can be freely designed.

A specific means for achieving this object is to use a pattern net in which a lace having an arbitrary pattern is integrally fixed and joined to a paper making net for papermaking,
It is to use the transparent cylinder attached as the upper net of the transparent cylinder.

The see-through cylinder is used as a dandy roll or a cylinder cylinder.

The lace of the present invention is a generic term for products in which threads are formed with a certain structure and a through-hole pattern is shown due to the density of the gaps, and the cloth lace is an embroidered base cloth such as cloth or net. Including (Kodansha: Encyclopedia of Contemporary World, Issued 3rd, 1972)
Volume 944). In the present invention, the material of the thread for manufacturing the lace is not particularly limited, but synthetic fibers such as polyester are preferable.

Expression of the pattern of the transparent paper of the present invention is a combination of the thicknesses of the threads of the lace forming the upper net, the density of the gap between the threads, the variety of the thickness of the pattern portion created by the size of the overlapping of threads, and the like. Since it is based on the variety of the lace structure, it is possible to obtain a transparent paper having a complicated and delicate pattern and rich gradation that cannot be obtained by the conventional technology.

Furthermore, by gradationally painting a part of the mesh of the lace by screen printing or printing, it is possible to further enhance the gradation.

As a method for integrally fixing and joining the lace to the papermaking net for papermaking, conventionally used means such as soldering, sewing, and bonding with an adhesive can be arbitrarily selected depending on the material of the lace.

[Operation] When a transparent paper is produced by using a pattern net formed by fixing and joining a lace to a papermaking net as in the present invention, the lace is used in the production of the transparent net. Since the main work is the fixed joining between the papermaking machine and the paper making net, it does not require the high skill and skill required in the past.

If machine lace is used, the production time of the pattern net for show-through can be greatly reduced, including the race production time. In the case of the present inventors, the production time of the pattern net is about 1 /
Shortened to 100.

Since the appearance of the show-through pattern is due to the structure of the lace thread, the tone expression can be improved compared to the method of producing the show-through pattern, which is mainly performed by the conventional method. Are better. Furthermore, since there is no risk of holes in the paper layer due to the transparent pattern, it is also excellent in that there are no restrictions on the design of the transparent pattern.

In the conventional method in which the transparent pattern is directly punched out as unevenness of the net, there is a large risk that the uneven pattern is gradually deformed or worn during papermaking. That point,
The pattern net of the present invention in which the lace and the papermaking net are fixedly joined is also excellent in durability during papermaking.

The above has mainly described the operation of the present invention in comparison with the conventional method, but in addition, the lace of the present invention can be digitalized into a design by an electronic scanner device or the like, and can be manufactured by an automatic loom. Therefore, even complicated designs can be manufactured in a short time.

From the above, the present invention enables high-mix, low-volume production of transparent paper of various designs.

"Example 1" A part of the design of a lace woven with a polyester filament was painted by screen printing. The lace thus obtained was fixedly joined to a 60-mesh bronze paper net with an adhesive to form an integral pattern net, which was attached and used as the upper net of the dandy roll.

A transparent paper with gradation was obtained by a fine transparent pattern by a lace pattern and a strong transparent pattern by a portion filled with resin and raised by screen printing.

Example 2 A pattern net in which a lace woven with a polyester filament was integrally fixedly joined to a 90-mesh bronze paper net was attached to a cylinder cylinder and used.

A delicate and intricate lace pattern was transferred, and transparent paper with rich gradation was obtained.

C. Advantages of the Invention By using a lace fixedly joined to a paper making net as a net for see-through, it is technically easy and economical to carry out the production of a show-through paper with complicated delicate and rich gradation. Became.

[Brief description of drawings]

1 and 2 are perspective views showing a state in which a pattern net according to the present invention is attached. FIG. 1 shows a dandy roll,
The second is a disk cylinder. The numbers are the same,
(1) shows a lace, (2) shows a paper making net, (3) shows a frame of a dandy roll, and (4) shows a frame of a cylinder cylinder.

Claims (1)

[Claims] 1. A method for producing a see-through paper, which is produced by using a see-through cylinder having a pattern net formed by fixing and joining a lace to a paper making net as an upper net.