JP2004114443A - Manufacturing method for porous stamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for forming a non-ink-oozing non-porous protective film, which is obtained by fusing and solidifying the section of a thermoplastic porous stamping material having open cells after being cut not by the conventionally known method but by a new method. <P>SOLUTION: In this manufacturing method for a porous stamp, the non-ink-oozing non-porous protective film is formed by cutting the thermoplastic porous stamping material having open cells by a laser beam and then fusing and solidifying the section as a means for solving the problem. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to a method for producing a thermoplastic porous stamp having open cells.
[0002]
[Prior art]
A porous stamp made of a thermoplastic resin is made of a porous sheet or a porous pipe having continuous cells as a stamp material, and a non-porous protective coating that does not allow ink to ooze out and a porous remainder that can ooze ink. After being formed on a stamped surface consisting of a certain printing portion, the stamp is assembled by attaching it to a holder or the like.
However, the conventional porous stamp has a problem that the ink oozes because the side surface thereof is not formed on the non-porous protective film from which the ink cannot ooze.
Thus, a method of heating a metal master having a ridged blade formed thereon as in JP-A-3-281381, pressing the metal master against a porous stamp to form a stamped surface, and simultaneously fusing and solidifying the side surface, and JP-A-2000-280590. A method is disclosed in which a Thomson-type punching die (heating cutter) having a cutting blade embedded therein is heated to punch out a porous stamp material and simultaneously melt and solidify the side surface.
However, in order to melt and solidify the side surface, it is necessary to maintain the temperature of the mold higher than the melting point of the thermoplastic resin (50 ° C. to 150 ° C.). was there. In addition, since the shapes and sizes of the dies are fixed, many types of dies have to be prepared in order to create a variety of stamps.
[0003]
[Patent Document 1]
JP-A-3-281381 [Patent Document 2]
JP 2000-280590 A
[Problems to be solved by the invention]
The present invention uses a new method, not a conventionally known method, to melt and solidify a cut surface of a thermoplastic porous stamp material having open cells to form a non-porous protective film from which ink cannot exude. It is intended to provide.
[0005]
[Means for Solving the Problems]
As means for achieving the above object, a thermoplastic porous stamp material having open cells is cut using a laser beam, and the cut surface is melted and solidified to form a non-porous protective film from which ink cannot ooze. A method for manufacturing a porous stamp is used.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
First, a head portion to be finally irradiated with a laser beam is arranged at a required portion of the porous stamp material to perform positioning. Next, the laser beam machine is operated and moved while irradiating the laser beam. Then, the cut surface is melted and solidified at the same time as the porous stamp material is cut.
In the present invention, a known industrial laser beam machine such as a carbon dioxide laser beam machine or a YAG laser beam machine can be used. Specifically, a laser beam machine dedicated to stamping described in JP-A-2000-52075 is preferable. Used. The processing conditions vary greatly depending on the material, thickness, porosity, etc. of the porous stamp material, but the output is 5 to 100 W and the processing speed is about 100 to 800 mm / sec.
Examples of the thermoplastic porous stamping material having open cells that can be used in the present invention include polyethylene, polypropylene, polybutylene, polyurethane, polystyrene, polyvinyl chloride, polyester, polycarbonate, a polyethylene thermoplastic elastomer, and a polypropylene thermoplastic as raw materials. Thermoplastic resins such as elastomers, polybutylene-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, polystyrene-based thermoplastic elastomers, polydiene-based thermoplastic elastomers, and polychloride-based thermoplastic elastomers can be used. This can be formed into open cells by a known dissolution method, foaming method, sintering method, or the like, and a sheet or roll is mainly used. As the thermoplastic resin, those having a melting point of 50 ° C. to 150 ° C. are preferably used, and the bubble diameter of the porous stamp material is not particularly limited, but those having a range of 2 to 100 μm are 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.
Further, in the present invention, it is not necessary to simultaneously perform the step of cutting the porous stamp material and the step of forming the stamp face, and the cutting can be performed before or after the stamp face is created. As a method of forming the stamped 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, and using various laser beams such as a carbon dioxide gas laser and a YAG laser A method of heating and melting an unnecessary portion, a method of heating and melting an unnecessary portion with an infrared xenon flash lamp with a heating material interposed, and the like can be used.
[0007]
【The invention's effect】
As described above, the present invention is an invention for producing a porous stamp by a method of cutting a thermoplastic porous stamp material having open cells using a laser beam, and cutting and simultaneously solidifying a cut surface while cutting the porous stamp material. This has a very practical effect that a non-porous protective film from which ink cannot ooze easily and quickly can be formed.
In addition, since the cutting direction can be freely controlled simply by changing the program of the laser processing machine, it is extremely easy and quick to respond not only to round or square shapes but also to porous stamps with complicated shapes. Can be.
[Brief description of the drawings]
FIG. 1 is an explanatory view before cutting of the present invention. FIG. 2 is an explanatory view after cutting of the present invention.
DESCRIPTION OF SYMBOLS 1 Porous stamping material 2 Laser beam 3 Non-porous protective coating

Claims (1)

Production of a porous stamp, characterized in that a thermoplastic porous stamp material having open cells is cut using a laser beam, and the cut surface is melted and solidified to form a non-porous protective film from which ink cannot ooze. Method.

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