JPS5838292B2 - sand pine film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for improving a sand matte film having surface characteristics with improved smearing properties suitable for use as a drafting film.

Polyester film is generally suitable for sandblasting, but this film is excellent in terms of dimensional stability against temperature and humidity, high Young's modulus, etc., and as a drafting film, sandblasted polyester film is the most suitable. It is one of the suitable materials.

However, the film has serious drawbacks when used for drafting purposes, such as the lines becoming thicker with ink or black ink, the thickness of the lines being uneven, and so-called bleeding phenomena.

The inventor investigated the cause of this phenomenon and studied ways to improve it. As a result, the sand matte film has a three-layer structure. The rough surface layer due to processing and the third layer are feathery layers, and it was discovered that this third feathery layer is the cause of bleeding, and by removing the feathery layer, the bleeding property is significantly improved. Knowing this, we arrived at the present invention.

In the present invention, the feather-like portions existing on the mat surface of the Zandmat film are either (a) rubbed with a brush made of organic fibers having a single fiber fineness of 1 to 50 deniers, or (b) coated with a fabric made of the organic fibers. 2 by heating the sand matte film to its thermoplastic temperature using a heated roll.
Pressurize to a pressure of ~50 kg/crA, or (c) heat to the thermoplastic temperature of the sand mat film using a roll coated with an organic elastic material having a Barcol hardness of 30 to 85 degrees. This is a method for modifying a sand matte film, which involves pressing the matte rough surface layer to homogenize it by applying pressure to a pressure of ~50 kg/ctA.

The present invention will be explained.

The sand matte film of the present invention refers to a film made of polyester film, polyolefin film, or other synthetic organic resin film, in which fine silica sand or the like is sprayed together with a fluid to give the surface irregularities.

Therefore, the method of the present invention can be applied regardless of the chemical type of film.

The organic fibers of the present invention are natural or synthetic organic fibers, and hard fibers with a Mohs hardness of 7 degrees or higher, such as asbestos fibers, glass fibers, and metal fibers, are unsuitable.

Applicable fibers include natural fibers such as wool silk and cotton, polyamides, polyacrylonitrile polyesters, polyolefins, and polyvinyl synthetic fibers.

When the single fiber fineness of the fiber exceeds 50 denier, the bending hardness becomes significant, which is not preferable.

Flexible fibers of 50 deniers or less are suitable, and single fiber fineness of about 2 to 30 deniers is most preferred.

These organic fibers are implanted as brushes and used as abrasive tools.

Another way of using organic fibers is to use the above-mentioned fibers as fabrics (woven fabrics, knitted fabrics, nonwoven fabrics) to cover the roll surface.

Most preferred is a fabric made of organic fibers crimped.

Even in the case where the organic fiber has this crimp, it is necessary that the single fiber fineness is 1 to 50 deniers, and fine fibers less than 1 denier are too soft and have poor friction abrasion effect on the mat surface.

Moreover, if it exceeds 50 denier, scratch-like flaws are likely to occur on the mat surface, and if these flaws occur, the ink will deteriorate. Although the purpose of preventing ink from bleeding due to capillary action is achieved, it also reduces the writing quality, which is undesirable.

The surface of the mat is rubbed using a roll covered with a cloth made of organic fibers. A method of leveling the matte surface layer by polishing or processing the surface of the cloak between rolls is effective in preventing bleeding.

As with organic fiber fabrics, mat surface finishes can be applied using rolls coated with synthetic or natural rubber.

This organic elastic material has a hardness of 3 on the Barcol hardness scale.
It is a rubber material such as polyurethane rubber, butyl rubber, silicone rubber, etc. with a temperature of 0 to 85 degrees.

At this time, fibers, inorganic or organic fine particles, etc. may be contained within a range that does not cause scratch-like flaws.

Furthermore, it can be used as a foamable organic elastic body for the purpose of adjusting the flexibility of the elastic body.

At this time, the foaming rate is preferably in the range of 30 to 95%.

However, the foaming rate refers to the apparent density of the foamed elastic material to the true density (
It is expressed as a percentage of the density of a non-foamed elastic body.

The foaming rate is adjusted so that the surface hardness of the elastic body is 30 to 85 degrees.

When the hardness of the organic elastomer is less than 30 degrees, the polishing or pressing effect on the mat surface is poor, and when it exceeds 85 degrees, scratches on the mat surface are likely to occur.

According to the method of the present invention, by polishing or applying pressure to the matte surface of the sand matte film, the layer of feather-like parts on the matte surface is leveled, large depressions exceeding about 0.05 mm disappear, and as a result, the ink The smudge disappears.

When pressurizing the sand mat film using a coated roll made of cloth or organic elastic material, the temperature at which the sand mat film is thermoplasticized (temperature exceeding the glass transition point), for example, 1.
0 0 to 160℃, and 2 to 50 kg/
It is preferable to apply a pressure of cy;t.

The film finished by the method of the present invention has an ink. Good quality with no ink bleeding or scratches can be obtained.

Example 1 One of the two opposing rolls is covered with a carpet-like fabric made of 4-denier crimped long nylon fibers formed into loops. , while rotating the film at a circumferential speed of 50 m/min in the opposite direction to the running direction of the film. 5
A drafting sand mat film with a thickness of 75μ is placed between these two rolls while applying a contact pressure of 3.0 kg/m.
It was run at a speed of 5 m/min.

The treated part and the untreated part are provided on the same film surface, and a film is passed through both parts of the film to a thickness of 0.
．． Drawing lines were drawn using a 6 mm drafting pen (manufactured by STAEDTLER, West Germany), and the following results were obtained.

That is, in the untreated area, the line is twice as thick due to the bleeding property, but in the treated area, the thickness is almost equal to that of the pen, and because the ink does not bleed, the line is dark and sharp.

Example 2 One of the two opposing rolls was covered with a nitrile rubber foam with a hardness of 60 degrees and a foaming rate of 40%.
Place this in contact with the film on the matte-treated surface side,
While rotating the film at a circumferential speed of 70 m/min in the opposite direction to the running direction of the film, a contact pressure of 0.5 kg/m was applied to the film, and a thickness of 7.
A 5μ sand mat film for drafting was run at a speed of 3.5 m/min.

A portion treated as described above and an untreated portion are provided on the same film surface, and both portions of the film are penetrated to a thickness of 0. 6 mm drafting pen (West German STAEDTLER)
The following results were obtained.

That is, in the untreated area, the line is twice as thick due to the bleeding property, but in the treated area, the thickness is almost equal to that of the pen, and because the ink does not bleed, the line is dark and sharp.

Example 3 A loop-shaped fabric made of the same 4-denier crimped nylon yarn as used in Example 1 was covered with a diameter of 2001n1r.
L roll and a chromium-plated roll (temperature maintained at 120'C by circulating a heating medium) as an opposing roll were used, and the matte surface of the sand matte film was coated with nylon fabric under a pressure of 5 kg/cra. The matte surface was post-treated by running at a speed of 3.5771/min so as to touch the sides.

At this time, the sand matte film is preheated with a roll (100
℃) The base surface and matte surface were preheated using two heaters.

As a result, as in Example 1, the bleeding caused by ink was reduced by half.

Claims (1)

[Scope of Claims] 1. The feather-like portion existing on the mat surface of the sand mat film is rubbed by (a) a brush made of organic fibers with a single fiber fineness of 1 to 50 deniers, or (b) made of the organic fibers mentioned above. 2 by heating to the thermoplastic temperature of the sand mat film using a roll covered with fabric.
Polish and pressurize to a pressure of ~50 kg/cwt, or (c) heat to the thermoplastic temperature of the sand mat film using a roll coated with an organic elastic material having a Barcol hardness of 30 to 85 degrees. A method for modifying a sand matte film, which comprises pressing the matte rough surface layer to homogenize it by polishing and pressurizing it to a pressure of ~50 1y/c4.