JPS61263729A - Manufacture of plastic base - Google Patents

Abstract

PURPOSE:To eliminate the need of abrasive sands, evade the risk of labor accident and the like and consequently reduce the production cost of the title base by a method wherein a metal, on the surface of which fine irregularities have been formed in advance, is put upon a plastic sheet or film, the surface of which is swollen, in order to form fine irregularities on the surface of the plastic sheet or film by pressing the metal plate against the sheet or film. CONSTITUTION:The surface, on which fine irregularities are formed, of a metal plate is put upon a plastic sheet or film, the surface of which is swollen, in order to be pressed against the sheet or film. As a result, the irregularities of the metal plate is formed on the surface of the plastic sheet or film in their inverted shapes. The pressure to be applied is preferably 1kg/cm<2> or higher. Next, the metal plate is removed and solvent is evaporated from the surface of the plastic sheet or film in order to obtain a plastic supporter with fine irregularities on its surface. Moreover, the evaporation can be done by leaving the sheet or film at normal temperature. However, the heating for the aceleration of evaporation is preferable.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a method for producing a plastic support that has excellent adhesion to various materials such as metals for synthetic resin plating, and in particular to The base support is suitable as a support when producing a photosensitive image forming material for producing printed wiring boards or printing plates, an image forming material using printing ink, an image forming material using metal plating, or the like.

(B) Conventional technology One of the image forming materials is one in which a photosensitive resin is coated on a plastic support.

Various types of plastic supports are used, but those that have excellent adhesion to the photosensitive resin are preferred, as they cannot be used as image forming materials if the photosensitive resin peels off. This is because it becomes impossible to do so. The same holds true when plating a non-image area with another material, such as a metal, or when printing an image on a plastic support using printing ink.

In order to improve the adhesion with such an image forming substance, it has been conventionally practiced to form fine irregularities on the surface of a plastic support. As a forming method, a so-called air honing method or a so-called liquid honing method is adopted. The former is a method in which abrasive sand is sprayed together with air onto a plastic sheet or film, and the latter is a method in which it is sprayed together with water.

(c) Problems to be Solved by the Invention However, these methods have the following problems. That is, because abrasive sand is used, it scatters and creates a bad work environment, and post-processes are required after the formation of irregularities, such as a recovery process for the abrasive sand and a cleaning process to remove the abrasive sand from the surface of the plastic support. The problem is that the production cost is high.

The present inventors have developed a method for forming fine irregularities on the surface of a plastic sheet or film without using abrasive sand, and have solved the above problems at once.

(d) Means and operation for solving the problems, that is, the present invention, is a metal plate whose surface has been formed with fine irregularities in advance, which is superimposed on a plastic sheet or film whose surface has been swollen and pressurized. The present invention relates to a method for producing a plastic support, which is characterized by forming fine irregularities on the surface of a plastic sheet or film.

The metal plate used in the present invention has fine irregularities formed on its surface in advance. As for the method of forming the unevenness, a conventionally known so-called air honing method or liquid honing method may be adopted.Also in the present invention, fs is that polishing sand is used when making a metal plate, but when making a plastic support Since this method does not use abrasive sand, the above-mentioned problems can be solved. As the metal plate, an aluminum plate, a steel plate, etc. can be used, but those with high hardness and excellent wear resistance are particularly preferred.

As the plastic sheet or film, various known sheets or films such as polyethylene, polypropylene, polyester, nylon, polyvinyl chloride, acrylic resin, etc. can be used. The surface of this plastic sheet or film is then swollen, and this can be done by using a solvent passed through the material forming the sheet or film.For example, in the case of polyethylene or polypropylene, xylene, tetracyclic (I
JL Cyclohexane, benzene, toluene, etc. For polyester products, use a mixed solvent of carbolic acid and m-cresol, chloroform, dimethyl succinate, etc. For nylon products, use sulfuric acid, m-cresol, formic acid, etc. In the case of cyclohexanone, dioxane, diptyl phthalate.

In the case of acrylic resins such as nitrobenzene, tricresyl phosphate, diethyl phthalate, acetone, and benzene, chloroform, acetone, methyl ethyl ketone, benzene, toluene, methanol, dioxane, and hydrochloric acid are used. These solvents can be used at room temperature or heated, but it is necessary to swell only the surface of the plastic sheet or film to a sufficient extent during shaping. Swelling here means that only the surface of the sheet or film absorbs the solvent and swells, but it also includes cases where the swelling progresses further and only the surface swells infinitely, that is, dissolves.

Next, the swollen plastic sheet or film is placed over the surface of the metal plate on which fine irregularities are formed, and pressure is applied. As a result, the surface of the plastic sheet or film is shaped with the unevenness of the metal plate becoming uneven. The degree of pressurization is preferably 1 pupil/- or more; if it is less than 1 kg/-, the shaping becomes weak, and the unevenness of the metal plate tends not to be directly shaped into the plastic sheet or film.

Finally, by removing the metal plate and evaporating the solvent from the surface of the plastic sheet or film, a plastic support having fine irregularities on the surface is obtained. Incidentally, the evaporation may be allowed to stand at room temperature, but it is preferable to heat it in order to accelerate the evaporation.

(e) Effects of the Invention As detailed above, when manufacturing a plastic support by the method according to the present invention, abrasive sand is not used, so the abrasive sand does not scatter, creating a good working environment and improving labor. Risks such as disasters can be avoided. In addition, the post-process after forming irregularities on the plastic sheet or film is simply the process of evaporating the solvent on the surface, so it is much more streamlined than conventional air honing methods or liquid honing methods. This also has the effect of reducing production costs.

Furthermore, since the plastic support formed by the method according to the present invention has fine irregularities on its surface, when used as a support for a photosensitive planographic printing plate material, for example,
It has excellent adhesion to photosensitive resins and can print a large amount of printed matter with good reproducibility. If a plastic support without fine irregularities is used, the photosensitive resin will peel off during printing, making it impossible to print a large amount of printed matter with good reproducibility. Furthermore, as mentioned above, the plastic support obtained by the method according to the present invention can be used not only as a support for photosensitive lithographic printing plate materials, but also as a support for various coatings, printing, and metal plating. be able to. In this case as well, it can be suitably used because it has excellent adhesion to coating agents, inks, metals, and the like.

Claims (1)

[Claims] It is characterized by forming fine irregularities on the surface of the plastic sheet or film by superimposing a metal plate on which fine irregularities have been formed on the surface on a plastic sheet or film whose surface has been swollen and applying pressure. A method for producing a plastic support.