JP2003211805A - Method for manufacturing porous stamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a thermoplastic porous stamp with open cells using a quite new process instead of a conventionally known process. <P>SOLUTION: First, the surface of a thermoplastic porous stamp material with open cells is masked with a metallic foil to the specified shape, and the part which is not masked is melted/solidified by irradiating the metallic foil with a plasma by a plasma irradiator and thus a non-porous protecting coating film which does not allow oozing of the ink, is formed. At the same time, in the remaining part which is masked, a printing part which allows oozing of the ink, is formed. The method for manufacturing the porous stamp comprises the described steps. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a thermoplastic porous stamp having open cells. 2. Description of the Related Art A porous stamp made of a thermoplastic resin is made of a porous sheet having continuous cells, a porous pipe, or the like. After being formed on a stamped surface comprising a printed portion which is a porous residual portion that can be exuded, the stamp was assembled by attaching it to a holder or the like. As a conventional method of forming a stamp surface, a method of directly pressing a heated mold to melt unnecessary portions, a method of directly heating and melting unnecessary portions with a thermal head,
There are known a method of heating and melting unnecessary portions using various laser beams such as a carbon dioxide gas laser and a YAG laser, and a method of heating and melting unnecessary portions with an infrared xenon flash lamp with a heating material interposed. [0003] The present invention provides a method for producing a thermoplastic porous stamp having open cells using an entirely new method without using a conventionally known method. The purpose is. [0004] As means for achieving the above-mentioned object, as a means for masking a surface of a thermoplastic porous stamp material having open cells with a metal foil so as to have a required shape. Irradiating plasma from a plasma irradiator to melt and solidify a portion where the masking does not exist to form a non-porous protective film in which the ink cannot ooze out, A method of manufacturing a porous stamp is used, which forms a printed portion capable of exuding. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS After a mask is applied to the surface of a porous stamp material with a metal foil so as to have a required shape, plasma is irradiated from a plasma irradiator. Then, only the surface portion of the porous stamp material where no metal foil is present starts melting. Thereafter, when the irradiation of the plasma is stopped, the melted portion rapidly cools and solidifies to form a non-porous protective film.
At this time, the remaining portion where the metal foil exists forms the printed portion without any change. Next, when the metal foil is removed, a stamped surface composed of a non-porous protective coating and a printed portion is formed, and when ink is filled in the non-porous protective coating, ink cannot ooze out of the non-porous protective coating, A porous stamp from which the ink can ooze can be obtained from the printing portion. The thermoplastic porous stamping material having open cells used in the present invention includes, as raw materials, polyethylene, polypropylene, polybutylene, polyurethane, polystyrene, polyvinyl chloride, polyester, polycarbonate, polyethylene-based thermoplastic elastomer, and polypropylene-based thermoplastic elastomer. Thermoplastic resins such as a thermoplastic elastomer, a polybutylene-based thermoplastic elastomer, a polyurethane-based thermoplastic elastomer, a polystyrene-based thermoplastic elastomer, a polydiene-based thermoplastic elastomer, and a polychloride-based thermoplastic elastomer can be used. This can be made into open cells by a known dissolution method, foaming method, sintering method or the like, and a sheet or roll is mainly used. The thermoplastic resin has a melting point of 50.
C. to 150.degree. C. is preferably used, and the bubble diameter of the porous stamping material is not particularly limited, but a range of 2 to 100 .mu.m is preferably used. Good results can also be obtained by using a colored porous stamp material in which a coloring agent and a heating agent such as carbon black, an organic pigment, and a pearl pigment are mixed with the thermoplastic resin. [0007] As the metal foil used for masking, aluminum foil, gold foil, brass foil and the like can be used. As the plasma irradiator, Keyence Co., Ltd. plasma irradiator ST-7000 can be used. In the present invention, the thermoplastic porous stamp material can be melted even if the thermoplastic porous stamp material is impregnated with the ink in advance, masked, and then irradiated with plasma. Since the stamp surface can be processed into a porous stamp material impregnated with ink in advance, it is possible to obtain a stamp that can be stamped immediately after the stamp surface processing. Further, it has been found that the plasma irradiation also has an effect of modifying the surface of the thermoplastic porous stamp material. For example, when plasma is applied to the entire thermoplastic porous stamp material lightly, the permeability of the ink is improved, the replenishment time of the ink is shortened, and the ink ejection property at the time of imprinting is improved. Also, the back surface of the thermoplastic porous stamp material is improved. Irradiating the substrate with plasma has the effect of improving the adhesion to the plastic used for the stamp holder. First, a manuscript is prepared, and a mirror image thereof is transferred to an aluminum foil. Next, a so-called margin portion is cut out while leaving a portion to be a printing portion. In this manner, a masking image having a desired shape can be formed. Next, after the masking of the aluminum foil is brought into close contact with the surface of the porous stamp material, plasma is irradiated with an output of 300 W using a plasma irradiator. Then, only the surface portion of the porous stamp material in which no plasma exists starts melting. Thereafter, when the irradiation of the plasma is stopped, the melted portion rapidly cools and solidifies to form a non-porous protective film. At this time, the remaining portion hidden by the masking of the aluminum foil does not change at all, so that a printed portion is formed. Next, when the masking is removed, a stamped surface consisting of a non-porous protective film and a porous printed portion is formed, and when ink is filled into the non-porous protective film, the ink cannot exude from the non-porous protective film, A porous stamp from which the ink can ooze can be obtained from the printing section. The present invention is a very useful invention which has found a novel method for forming a stamped surface by irradiating a plasma to a thermoplastic porous stamping material having open cells. Irradiating the thermoplastic porous stamping material with plasma can modify the surface of the thermoplastic porous stamping material and improve the ink permeability, so that the ink replenishment time is shortened and the ink ejection property at the time of imprinting is improved. Will also be good.

[Brief description of the drawings] FIG. 1 is an explanatory view of an embodiment. FIG. 2 is a sectional view of the embodiment. [Explanation of symbols] 1 porous stamping material 2 Metal foil 3 Plasma generator 4 Plasma

Claims (1)

Claims 1. After masking a surface of a thermoplastic porous stamp material having open cells with a metal foil so as to have a required shape, irradiating a plasma from a plasma irradiator, At the same time as forming a non-porous protective coating that does not allow ink to seep out by melting and solidifying the areas where there is no masking,
A method for manufacturing a porous stamp, comprising forming a printed portion from which ink can ooze out by leaving a portion where the masking exists as a remaining portion.