JP2015058549A - Fabric material for cover sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fabric for cover sheet materials which is improved itself so as to make inconspicuous defects of yarn and weaving.SOLUTION: A fabric material for cover sheets is composed of warp of a thickness in the range of 250-400 μm and weft of a thickness in the range of 250-400 μm, with the thickness of the seam between the warp and weft in the range of 300-450 μm, and is surface-coated with a resin. The surface of the resin layer has an arithmetic average roughness Ra of 5.0-6.5 μm and a ten-point average roughness Rz of 30-40 μm.

Description

  The present invention relates to a woven material used for a cover material such as a book, a booklet, or a passport.

The cover material represented by bookbinding cloth is generally made by refining, bleaching, and dyeing the original fabric, coating the front and back surfaces with resin, and then finishing the surface by calendering or embossing.
Polyvinyl chloride, nylon, urethane, etc. are used for the resin and are used for various purposes.
The resin application method may be a spray or a coating machine such as roll coating.

Physical properties generally required as a cover material for bookbinding cloth and the like, such as curl resistance, water resistance, film strength, flexibility, and stain resistance, are sometimes required to be antifungal and slippery depending on the intended use.
In terms of design, in addition to the texture of the fabric used, there are those that pursue design and luxury, such as those that emphasize the unevenness of the fabric and those that add metallic and pearls.
In addition, offset printing aptitude and foil stamping aptitude may be required, and in particular, booklet aptitude, numbering aptitude, etc. may be required individually, such as booklet applications such as bank deposit passbooks.

The cloth for bookbinding uses a cloth woven fabric as a base material and is coated with a resin coating, but various materials such as natural fibers and chemical fibers are used for the yarn that is the material of the woven fabric.
If there are defects in the appearance of the base fabric or the raw material yarn, it may directly lead to the appearance defect of the product. Especially in the case of the fabric using natural yarn, the defect of the yarn or weave It is practically impossible to make this zero.
In order to deal with these defects, strict inspection and sorting must be performed in the process, which requires a lot of labor and leads to an increase in cost.

Further, in the resin coating, since the surface of the fabric is uneven, it is difficult to apply a smooth coating, and it is difficult to obtain a uniform surface. In particular, the coating on the defective portion of the base material was not uniform, and the defect became more noticeable.
Furthermore, due to the unevenness of the fabric surface, it was difficult to manage and stabilize the coating amount and film thickness.

Japanese Unexamined Patent Publication No. 60-39437 JP-A-9-58157

  An object of the present invention is to provide a cloth fabric for a cover material that improves the fabric fabric itself and makes defects in yarn and weave inconspicuous.

  In the present invention, the cover fabric is composed of warp yarns having a thickness of 250 to 400 μm and weft yarns having a thickness of 250 to 400 μm, and the seam thickness of the warp and weft yarns is in the range of 300 to 450 μm. Material.

  Further, the surface is further provided with a resin coating.

  Further, the arithmetic average roughness Ra of the surface of the resin layer is in the range of 5.0 to 6.5 μm, and the ten-point average roughness Rz is in the range of 30 to 40 μm.

  According to the present invention, it is possible to provide a fabric woven fabric for a cover material that improves the fabric woven fabric itself and obscure yarn and weave defects.

It is sectional drawing of an example of the textile material for covers of this invention. It is sectional drawing of an example of the textile material for covers of this invention.

  In the present invention, the cover material is composed of warp yarns having a thickness of 250 to 400 μm and weft yarns having a thickness of 250 to 400 μm, and the thickness of the seam between the warp and weft yarns is in the range of 300 to 450 μm. A cloth-based fabric material is used.

Desirably, it is preferable to use 100% natural fiber cotton as the yarn material. When using natural fibers made from cotton, the processability of the yarn, such as heat resistance, is superior to general chemical fibers, so that the textile material can be processed more stably when carrying out the process of the present invention. This is preferable. As other materials, natural fibers such as silk and hemp can be used.
The thickness of the woven material can be about 0.3 mm.

Further, the thickness of the seam between the warp and the weft is preferably in the range of 300 to 450 μm, and more preferably in the range of 350 to 400 μm. This range is preferable because yarn defects are reduced.
Furthermore, the warp and weft are preferably in the range of 250 to 400 μm, and more preferably in the range of 300 to 350 μm. If it is this range, it can fit in the range of the thickness of the above-mentioned seam.
In terms of the thickness of the yarn, it is preferable to use 10th to 20th, preferably 12 to 16th.

A resin layer can be formed on the woven material by coating as necessary.
The resin layer may be formed directly on the woven material by using a coating device or the like, but it is preferably formed by transferring a transfer film on which the resin layer is formed. When directly forming the resin layer, it was difficult to accurately measure the amount of resin applied and to manage the process such as variability because it was coated directly on the uneven woven material. By doing so, it becomes possible to form a uniform coating layer without being affected by substrate defects caused by yarn or weaving, which facilitates management and leads to improvement in the accuracy of the coating amount.

The type of resin to be coated can be selected according to the required physical properties. Starch, polyurethane, polyamide, polyester, epoxy, polyacrylate, methacrylate, polyvinyl alcohol, ethylene / vinyl acetate copolymer, acetic acid Vinyl / acrylic acid ester copolymers, polyacrylic acid esters and the like can be used.
The resin may be used alone or in combination of two or more.
As the resin, a curable resin can be used, and it is preferable that the resin is uncured when it is applied to the peelable support. It is preferable to cure at the time of subsequent transfer from the viewpoint of adhesion to the woven material.
A resin layer having a thickness of about 10 to 80 μm can be used.

The arithmetic average roughness Ra of the surface of the resin layer is in the range of 5.0 to 6.5 μm, more preferably 5.6 to 6.1 μm, and the ten-point average roughness Rz is 30 to 40 μm, more preferably 30 to 35 μm. It is good if it is within the range.
If Ra is less than 5.0 μm, the effect of reducing yarn defects is not exhibited. If it is greater than 6.5 μm, embossing edges (appearance defects due to the embossing roll) occur when embossing is performed, resulting in poor appearance. Will increase.
Further, when Rz is less than 30 μm, the effect of reducing yarn defects is not exhibited. When it is larger than 40 μm, embossing edges (appearance defects caused by the embossing roll) occur when embossing is performed. turn into.

  The transfer film used in the transfer method can be formed by performing resin coating on a peelable support. As the peelable support, a polyester film or the like can be used. In addition to a polyester film, a polyether ether ketone, polypropylene, polyimide, or other film can be used. The thickness of the film is preferably 25 to 250 μm, more preferably 25 to 125 μm. In general, these films have better thickness accuracy than woven materials, and there are few defects due to yarn and weaving as seen in woven materials. Therefore, when applying resin using a coating machine, Becomes more uniform. Therefore, it is possible to avoid that the defect of the woven material induces the defect of the coating and the defect of the woven material becomes more noticeable.

Since the surface shape of the releasable support forms the resin surface shape after transfer, it is possible to select a material having a required surface roughness and glossiness within a certain range. For example, as the surface roughness, Ra is in the range of 0.08 to 0.80 μm, and Rz is in the range of 1.90 to 7.80 μm. More preferably, Ra is 0.20 to 0.65 μm, and Rz is 3.50 to 6.50 μm. Within this range, the surface shape of the resin layer can be formed.
In addition, a matte polyester film or a fully glossy polyester film may be used as the peelable support. In this case, the resin layer surface has a fully glossy finish.

Further, it is possible to directly emboss the woven material and crush defects and weaving defects caused by yarns so that the defects caused by yarns or weaving can be eliminated or made inconspicuous.
Furthermore, after forming the resin layer, embossing may be performed to control the surface shape.

The shape of the embossing roll used when embossing is directly applied to the woven material requires Rz of 20 to 45 μm, more preferably 30 to 40 μm. Moreover, this embossing roll can use a metal thing.
Ra is 3.0-10 micrometers, More preferably, it is 5.0-7.0 micrometers.
The embossing roll used for embossing after forming the resin layer has a Ra of 5.0 to 6.5 μm, more preferably 5.6 to 6.1 μm, and a ten-point average roughness Rz. It is good to be in the range of 30-40 μm, more preferably 30-35 μm.

<Example 1>
As a woven material, a cloth having a thickness of 0.3 mm made of warp and weft having an average thickness of 300 to 350 μm made of cotton was used. The maximum thickness of the thread joint of this woven material was 400 μm.
The fabric material was first embossed using an embossing roll of Ra 6.5 μm and Rz 35 μm.
Next, a polyester film having a thickness of 80 μm, Ra 0.4 μm, and Rz 5.0 μm is prepared as a peelable support, and a curable acrylic resin is applied to the peelable support at a thickness of 40 μm as a resin layer. Created.
The transfer film was laminated so that the resin layer side was in contact with the fabric material, and the resin layer was cured by irradiating ultraviolet rays from the peelable support side.
Next, from the side of the resin layer transferred and formed on the woven material, second embossing was performed using an embossing roll of Ra 6.0 μm and Rz 35 μm to obtain a cover material.
The surface roughness of the obtained cover material on the resin layer side was Ra 5.83 μm and Rz 34.87 μm.

<Example 2>
The thickness of the warp and weft used for the woven material is 200 to 300 μm, the surface roughness of the embossing roll used for the first embossing is Ra 8.0 μm, Rz 32 μm, and the embossing roll used for the second embossing A cover material was obtained in the same manner as in Example 1 except that the surface roughness was Ra 8.0 μm.
The surface roughness of the obtained cover material on the resin layer side was Ra 7.88 μm and Rz 31.74 μm.

<Comparative Example 1>
Use a woven material with an average thickness of 400-450 μm and a maximum seam thickness of 630 μm, and apply the second embossing using an embossing roll of Ra 6.0 μm and Rz 35 μm without applying the first embossing. The cover material was obtained. .
The surface roughness of the obtained cover material on the resin layer side was Ra 7.96 μm and Rz 41.68 μm.

<Evaluation>
(Defect rate)
The resulting cover material was inspected for the incidence of yarn defects and other defects.
The results are shown in Table 1.
(Abrasion resistance)
The obtained cover material was subjected to a scratch hardness test (load needle method) in accordance with JIS K 5600-5-5 (ISO 1518). In the test, the load was gradually increased, and the case where the coating film was broken was defined as NG (x), and stopped when x was marked twice.

Regarding the defect rate, in all of the examples, the incidence of appearance defects was as low as about 3% or less, but in the comparative example, defects occurred on the entire surface. As for the defect of yarn defects, all of the examples had better results than the comparative example.
Regarding the scratch resistance, all of the examples had better results than the comparative example.

DESCRIPTION OF SYMBOLS 1 ... Textile material 2 ... Resin layer

Claims (3)

  A cover fabric material comprising warp yarns having a thickness in the range of 250 to 400 μm and weft yarns having a thickness in the range of 250 to 400 μm, and the thickness of the seam between the warp yarns and the weft yarn being in the range of 300 to 450 μm.   The cover fabric material according to claim 1, further comprising a resin coating on the surface.   The cover fabric according to claim 1 or 2, wherein the arithmetic average roughness Ra of the surface of the resin layer is in the range of 5.0 to 6.5 µm and the ten-point average roughness Rz is in the range of 30 to 40 µm. material.

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