JP3830657B2 - Endless printing belt for rotation marking - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endless printing belt using a porous body used for a rotation mark of a built-in ink type.
[0002]
[Prior art]
A rotational mark made of an endless print belt using a porous body having open cells disclosed in JP-A-54-103127, Japanese Utility Model Laid-Open No. 54-118210, or the like can be used because it can contain ink in itself. It is very useful because it can be continuously stamped without ink being attached every time. Conventionally, spongy rubber is mainly used for the porous body of such an endless printing belt, and a cotton cloth is mainly used as a base material for complementing the strength of the rubber. Almost no changes were made to other substances such as thermoplastics.
This is presumably because thermoplastic materials such as polyethylene and polypropylene have poor adhesion to cotton cloth, and therefore, when used for the endless printing belt, there is a problem that cannot be put into practical use.
In addition, conventional endless printing belts with rotational marks are generally formed by simultaneously molding the marking surfaces of characters, figures, symbols, patterns, etc. when molding endless printing belts. The pedestal and the stamped surface are engraved in two steps.
However, in this method, required characters, figures, patterns and the like have to be engraved in the mold in advance, and it has not been possible to form the endless print belt by adding characters and the like.
[0003]
[Problems to be solved by the invention]
Therefore, the present invention was invented for the purpose of obtaining an endless printing belt that can sufficiently withstand practical use even when a conventional base material is used when a thermoplastic porous body is used for the belt portion. It is another object of the present invention to provide an endless printing belt that can be formed with a new marking surface even after it is once manufactured.
[0004]
[Means for Solving the Problems]
Endless printing for rotary stamps, in which a sheet made of a thermoplastic porous material is placed on a base material, heat-sealed at an appropriate interval, and the base material and the thermoplastic porous material are partially fused. belt.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
As the base material used in the present invention, a plain fabric or twill fabric made of cotton, silk, rayon, nylon, polyester, or the like can be used. From a synthetic fiber having a fineness of 1d or less, called ultrafine fibers, a fineness of 100d or more is used. Various fabrics using up to natural fibers can be used. As the base material used in the present invention, a material that does not melt at the melting temperature of the thermoplastic material is used, and a material that is not stretched is used in order to prevent defects during molding of the endless print belt.
As the thermoplastic porous body used in the present invention, a thermoplastic resin that melts at 50 ° C. to 180 ° C. is used. For example, polyethylene, polypropylene, vinyl chloride, and the like can be used, and polyethylene is particularly preferably used. In the present invention, in order to obtain a porous body having open cells, a water-soluble cell forming agent such as sodium chloride or calcium chloride is added to a thermoplastic resin and kneaded, and then molded into a sheet shape. The forming agent is washed out to make a porous body. When producing the porous body, in addition to the water-soluble foam forming agent, fine powder of heat-generating material that generates heat by absorbing infrared rays such as carbon black and other colorants may be added and kneaded. In order to obtain a porous body, there is a method in which a foaming agent is mixed with a thermoplastic resin to form open cells, but this is not preferable because it is difficult to obtain continuous cells having a uniform size.
[0006]
The endless belt of the present invention is manufactured as follows.
First, at least a water-soluble foaming agent such as sodium chloride or calcium chloride is added to a thermoplastic material such as polyethylene, and if necessary, a fine powder of a heating material such as carbon black is added and kneaded, and then extruded into a plate shape. To create a sheet. Next, the water-soluble bubble forming agent is eluted using water or hydrochloric acid to obtain a sheet-like thermoplastic porous body.
Next, a base material is prepared, the thermoplastic porous body is placed on the base material, and the mold, sealer, trowel, etc., carbon dioxide gas laser, YAG heated from the thermoplastic porous body side to 50 ° C. to 200 ° C. Using a laser beam such as a laser, the thermoplastic porous body is dissolved at an appropriate interval. As a result, the base material and the thermoplastic porous body are partially bonded by the dissolved thermoplastic substance. Moreover, the thickness of the thermoplastic porous body remains as it is in the portion that remains without being dissolved to form a pedestal. The side surface of the pedestal is also in a molten state.
Next, both ends of the product thus obtained are overlapped and melt-bonded with a heat sealing machine, and this is cut into a necessary width to produce an annular endless print belt.
[0007]
In the present invention, the stamp face is formed by forming the required characters, figures, etc. on the pedestal. More specifically, the thermoplastic porous body in the portion corresponding to the margin other than the required characters is melted. Solidification forms a non-porous body from which ink cannot bleed, and also leaves a portion of the thermoplastic porous body corresponding to characters or the like so as to allow ink oozing to form a printing surface.
This process is performed either before or after forming the annular endless printing belt, and the positive characters in which the required characters are displayed on a black background and the margins are shown on a transparent background, and the required characters are displayed on a transparent background and the margins on a black background. Overlay the negative film shown on the pedestal and irradiate infrared rays from the film side to melt the margin part, a method to melt the margin part such as letters using a laser beam such as carbon dioxide laser and YAG laser, A method in which a mold engraved with characters or the like is heated to 50 to 200 ° C. and pressed against the pedestal to melt a blank portion other than the characters or the like is used. At this time, the height difference between the character portion and the blank portion is preferably about 0.01 mm to 1.0 mm.
In any case, if an endless printing belt having only a pedestal on which characters or the like are not initially formed is manufactured, it is possible to obtain an endless printing belt on which a necessary number of characters or the like are formed when necessary later. Therefore, it is not necessary to keep an inventory of useless finished products.
[0008]
【Example】
Hereinafter, the present invention will be described by way of examples.
In FIG. 1, reference numeral 1 denotes a base material, which uses a cotton cloth obtained by plain weaving of 120 yarns of double yarn in a length / width of 120 / inch. 2 is a thermoplastic porous body, which uses porous polyethylene that melts at 70 ° C. Reference numeral 3 denotes an adhesive portion, which is bonded to the base material 1 by dissolving the thermoplastic porous body 2. Reference numeral 4 denotes a pedestal, which is a portion left by dissolving the thermoplastic porous body 2.
Next, the manufacturing method of an Example is demonstrated.
First, a sodium chloride fine powder is added to a polyethylene resin and kneaded to produce a plate-like sheet having a thickness of 2 mm.
Next, this sheet is immersed in warm water to wash out sodium chloride, and when it is completely removed, it is dried. After thoroughly drying, place 120 yarns of double yarn on a plain-woven cotton cloth with a length / width of 120 / inch, melt at regular intervals using a stick-shaped heat sealer heated to 70 ° C, and adhere to the cotton cloth. . At this time, the dissolved portion becomes an adhesive portion, and the undissolved portion remains as a pedestal. Therefore, the base and the cotton cloth are not bonded at all. Moreover, the side surface of the pedestal is also in a melted state.
Next, a negative film in which a required character or the like is transparent and the blank is black is overlapped and adhered to the pedestal, and infrared rays are irradiated from the negative film side to melt the blank and form a stamp face.
Next, both ends are overlapped and heat-sealed by a heat sealing machine. When the product thus obtained is cut to a required width with a cutter heated to 70 ° C., an endless print belt with the side surfaces sealed is completed.
In order to obtain a rotation mark, a cut endless print belt is incorporated into the rotation mark, and ink is dropped onto the surface of each marking from the surface to complete.
[0009]
【effect】
According to the present invention, even when a thermoplastic material and a conventional base material are used, an endless printing belt that can withstand practical use without peeling off the pedestal even when used for a long period of time can be obtained.
In addition, a non-adhered portion can be formed by partially bonding the base material and the thermoplastic porous body, but this improves the flexibility of the endless print belt, and the smoothness of the rotation when assembled to the rotation mark is smooth. An effect was also obtained.
Furthermore, since only the pedestal having no marking surface is once manufactured and the endless printing belt can be formed again later, an endless printing belt in which a necessary number of characters or the like are formed when necessary is obtained. Since it is possible, it is not necessary to keep a stock of useless finished products.
In addition, since the present invention can seal all parts other than characters and the like, ink evaporation can be suppressed, and ink bleeding from the side surface of the print belt can be prevented.
[0010]
[Brief description of the drawings]
FIG. 1 is a state diagram in which a thermoplastic porous material is dissolved at a predetermined interval in a state where a sheet-like thermoplastic porous material is placed on a substrate. FIG. 2 is an endless printing belt of the present invention.
DESCRIPTION OF SYMBOLS 1 Base material 2 Thermoplastic porous body 3 Bonding part 4 Unbonding part 5 Base

Claims (1)

Endless printing for rotary stamps, in which a sheet made of a thermoplastic porous material is placed on a base material, heat-sealed at an appropriate interval, and the base material and the thermoplastic porous material are partially fused. belt.

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