JP2009073033A - Seal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal in which no crack is caused in the adhesion part of a seal material and a seal holder even when the seal is repeatedly used, in which the seal material and the seal holder are surely fixed, and which has excellent sealing property. <P>SOLUTION: The seal includes a seal material composed of thermoplastic resin and a seal holder provided with a frame for holding the seal material. In the seal, a projection is provided to the lower end face of the frame, the seal material is housed in the seal holder in a manner protruding from the frame, and the periphery of the seal material and the lower end face of the frame are fused and joined over the entire circumference. The seal is characterized in that the periphery of the seal material and the projection are fused and joined over the entire circumference on the lower end face of the frame. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stamp formed by fusion-bonding a stamp material and a stamp holder over the entire circumference, and fixing and sealing them together.

As a stamp to hold a stamp made of rubber or resin by fusion bonding, as shown in Japanese Utility Model Publication No. 59-32543, after holding the stamp in a stamp holder, a thermoplastic resin receipt is fused to hold the stamp. In addition to the stamps to be printed, there are known stamps that hold the printing material and the stamp holder by direct fusion bonding, such as JP-A-4-363285, JP-A-8-132720, and JP-A-2000-94818.
In JP-A-4-363285, the peripheral edge of the printing material and the end face of the stamp holder are melted and bonded together by heat, so the bonding force is weak. If repeated stamps are used, the joint will crack and ink will leak from the crack. There was a drawback that it would come out. Furthermore, when used, there is a drawback that the joint portion is broken and the printing material falls from the stamp holder.
Japanese Patent Application Laid-Open No. 8-132720 has a problem that the peripheral part of the printing material and the side surface of the stamp holder are fusion-bonded by heat.
Japanese Patent Application Laid-Open No. 10-181173 is one in which the peripheral edge portion of the printing material and the lower end portion of the stamp holder are fusion-bonded by heat. However, since the amount of fusion at the lower end portion of the stamp holder is small, there is a drawback that adhesion is difficult. there were.
Japanese Patent Laid-Open No. 2000-94818 discloses that the lower end edge of the stamp holder member and the peripheral edge of the printing material are deformed by heat pressure to form the peripheral edge of the printing material on a slope, and the lower end edge of the stamp holder member is formed on a wedge that hooks the peripheral edge of the printing material. Since the bottom edge of the stamp holder member is formed in a wedge, the attachment between the stamp holder member and the stamping material is mechanical, providing a seal with excellent sealing performance and effective for repeated use. It is a thing. However, since the wedge (hook) part is provided on the stamping material side that is directly subjected to the stress of imprinting, the joint part gradually cracks by repeated use, and ink leaks from the crack, or the crack expands and breaks. There was a drawback.

Japanese Utility Model Publication No.59-32543 JP-A-4-363285 JP-A-8-132720 JP-A-10-181173 JP 2000-94818 A

  Therefore, the present invention provides a stamp that has a sealing material and a stamp holder that are securely fixed, and that is excellent in hermeticity without cracking the fused portion between the stamp and the stamp holder even when the stamp is used repeatedly. The purpose is that.

  A stamp material made of a thermoplastic resin, and a stamp holder having a frame for holding the stamp material, provided with a protrusion on a lower end surface portion of the frame, and accommodated in the stamp holder in a state of protruding the stamp material from the frame; In a stamp formed by fusion-bonding the peripheral edge portion of the stamping material and the lower end surface portion of the frame, the peripheral edge portion of the stamping material and the protrusion are fusion-bonded over the entire periphery on the lower end surface portion of the frame. Characteristic stamp. A stamp, wherein the stamp is a porous stamp made of a thermoplastic resin having continuous pores.

  In the present invention, a protrusion is provided on the lower end surface portion of the frame of the stamp holder, and the molten protrusion and the molten printing material are fusion bonded so that the protrusion overlaps the peripheral edge portion of the printing material on the lower end surface portion of the frame. Is formed on the lower end surface of the frame. Therefore, the stress at the time of stamping does not directly affect the stamping material, and the stamping material and stamping holder can be securely fixed without the peripheral edge of the stamping material being detached from the stamping holder or opening any number of times. It has excellent sealing properties and can prevent ink leakage.

Hereinafter, the best mode for carrying out the present invention will be described.
The stamp of the present invention includes a stamp material made of a thermoplastic resin and a stamp holder provided with a protrusion on a lower end surface portion of a frame for holding the stamp material. Then, the printing material is accommodated in the stamp holder in a state of protruding from the frame, and the peripheral edge portion of the printing material and the lower end surface portion of the frame are fusion-bonded over the entire circumference. By doing so, the peripheral edge portion and the protrusion of the printing material are fusion-bonded over the entire periphery on the lower end surface portion of the frame.
Details will be described below.
As the thermoplastic resin used as the material of the printing material, a thermoplastic resin that melts at 50 ° C. to 300 ° C. can be used. For example, polyethylene, polypropylene, polybutylene, polyurethane, polystyrene, polyvinyl chloride, polyester, polycarbonate, polyethylene series Thermoplastic elastomer, polypropylene thermoplastic elastomer, polybutylene thermoplastic elastomer, polyurethane thermoplastic elastomer, polystyrene thermoplastic elastomer, polydiene thermoplastic elastomer, polychloride thermoplastic elastomer, ethylene vinyl acetate copolymer resin, etc. Can be used. Among these, polyolefin thermoplastic resins such as polyethylene, polypropylene, ethylene-α olefin copolymer, polyethylene thermoplastic elastomer, and polypropylene thermoplastic elastomer are particularly preferably used.
Further, as the stamp material, a thermoplastic resin stamp material in which characters or the like are not formed, or a thermoplastic resin stamp material in which characters or the like are formed in a convex shape can be used. When a stamp made of thermoplastic resin with no characters or the like is used, the stamp will be formed after the stamp of the present invention is completed, and a stamp made of thermoplastic resin with the characters or the like previously formed in a convex shape is used. In this case, the stamp of the present invention can be used immediately after completion.
In addition, as the printing material, a porous material or a non-porous printing material can be used. When a porous printing material is used, it is possible to obtain a penetrating mark that can contain ink, and when a non-porous printing material is used, it is possible to obtain a stamp that transfers ink from a stamp table.

The stamp holder of the present invention includes a joint member for coupling with a grip member for gripping with a hand or other parts, and a space for accommodating a stamp material. The space for storing the stamp material is formed by a frame installed below the stamp holder.
Further, a protrusion is provided at the center of the lower end surface portion of the frame. The protrusions are installed at the central portion at a distance from both side surfaces of the frame, in order to ensure that a fusion-bonding portion described later is formed on the lower end surface portion of the frame.
The material of the stamp holder is polyethylene, polypropylene, polybutylene, polyurethane, polystyrene, polyvinyl chloride, polyester, polycarbonate, polyethylene-based thermoplastic elastomer, polypropylene-based thermoplastic elastomer, polybutylene-based thermoplastic elastomer, polyurethane-based thermoplastic elastomer, polystyrene. Thermoplastic resins such as thermoplastic thermoplastic elastomers, polydiene thermoplastic elastomers, polychloride thermoplastic elastomers, and ethylene vinyl acetate copolymer resins are used. In particular, from the viewpoint of adhesive performance, it is preferable to use the same or similar material as the above-mentioned stamp, and when a polyolefin-based thermoplastic resin is used for the stamp, it is preferable to use a polyolefin-based thermoplastic resin for the stamp holder as well. .

Next, the stamp material is accommodated in the stamp holder in a state of protruding from the frame. On the back side of the printing material, a cushion material, an ink occlusion body, a bottom raising member for raising the height, and the like may be accommodated.
Next, the peripheral edge portion of the printing material and the lower end surface portion of the frame are fusion-bonded over the entire circumference. Specifically, a heat sealing jig having a sufficient size capable of simultaneously melting the entire circumference of both the printing material and the frame is prepared and heated to a temperature higher than the melting temperature of the printing material and the frame. Press for a few seconds.
More specifically, first, the heat sealing jig comes into contact with the peripheral portion of the printing material and the peripheral portion is melted, and a part of the melt flows out toward the lower end surface portion of the frame. When further pressed, the heat sealing jig comes into contact with the protrusion provided on the frame and the protrusion is melted. Next, both melts are bonded and bonded in a polymerized or mixed state. The joint part formed by melting the two is joined in a shape in which the melts overlap or mix depending on the difference in melting temperature, melting time, melting pressure, etc., but in any case, it is formed on the lower end surface part of the frame. .
Therefore, the stress at the time of stamping does not directly affect the stamping material, and the stamping material and stamping holder can be securely fixed without the peripheral edge of the stamping material being detached from the stamping holder or opening any number of times. In addition, it has excellent sealing properties and can prevent ink leakage.
In the fusion bonding step, it is preferable to place a protective film in order to protect the surface of the printing material and ensure the releasability of the heat sealing jig. As the protective film, a plastic film that can withstand high temperatures is used. For example, a polyethylene terephthalate film, a polyethylene naphthalate film, a polyamide film, a polytetrafluoroethylene film, a fluorine film, a silicone film, or the like can be used.
As a method for forming characters on the stamp surface of the thermoplastic resin stamp material of the present invention, a method for forming a stamp surface by selectively irradiating infrared rays with a xenon flash lamp or the like (Japanese Patent Laid-Open Nos. 50-31908 and 6). -155698, JP-A-10-114132), a method of forming a stamped surface by pressing against a heated mold (JP-A-50-155323, JP-A-60-193686), a carbon dioxide laser or YAG A method of directly engraving with a laser processing machine using various laser beams such as a laser (Japanese Patent Laid-Open No. 10-337943) can be used.

Example 1 will be described with reference to the drawings.
A mixture of 100 parts by weight of a polyethylene resin having a melting point of 70 ° C., 20 parts by weight of polyethylene glycol having a molecular weight of 400, and 350 parts by weight of sodium chloride having a particle size of 10 to 60 μm is kneaded with a slight amount of carbon black. A sheet-like raw material is created.
Next, the original member is immersed in warm water to completely remove polyethylene glycol and sodium chloride, and then sufficiently dried to obtain a grayish porous sheet having a thickness of 2.0 mm.
Next, the porous sheet is cut into a required size with a cutter to obtain a porous printing material made of a thermoplastic resin. At this time, when an ultrasonic cutter is used, the porous printing material 3 whose cut surface is melted and solidified simultaneously with cutting can be obtained.
Next, a stamp holder 4 made of polyethylene having a melting point of 70 ° C. and having an upper joint portion 4a and a lower frame 4b for accommodating the porous stamping material 3 is prepared, and the porous stamping material 3 protrudes from the frame 4b. Store in a state where A lattice-like bottom raising member having an ink occlusion body and ink passage holes is also accommodated on the back surface of the porous stamping material 3. A projection 4c is provided at the center of the lower end surface of the frame 4b. The protrusion 4c is installed at a central portion at a distance from the inner surface of the frame 4b.
Next, a polyethylene terephthalate film is placed as a protective film 30 on the surface side of the porous stamp 3. Next, a heat sealing jig 40 having a sufficient size capable of simultaneously melting the entire circumference of both the porous stamping material 3 and the frame 4b is prepared, heated to about 100 ° C., and then the porous stamping material 3 and the frame 4b. Press against.
When pressing is started, the peripheral edge of the porous stamping material 3 is first melted, and then the protrusion 4c provided on the frame 4b is melted. When it is released after about 3 seconds while being pressed, the melted portion of the protrusion is overlapped with the melted portion of the porous stamping material 3 and is fusion-bonded over the entire circumference. Further, a fusion bonded portion formed by melting both is formed on the lower end surface portion of the frame 4b.
Next, the protective film 30 was removed to obtain a unitized stamp of this example. Since the character or the like is not formed on the stamp, the character or the like is formed thereafter.

Next, a method for forming characters and the like on the stamp of Example 1 will be described.
In order to prepare the original of the present invention, first a block is created by a computer or the like, and then the block is output to a sheet using a dry copying machine or a laser printer that forms an image by attaching carbon toner. Create a manuscript sheet.
As the paper used in the present invention, a transparent sheet such as polypropylene resin, polyester resin, or polyethylene terephthalate resin or a white opaque sheet, or a sheet that transmits infrared rays, such as tracing paper or PPC paper, can be used.
As the manuscript, one that is divided and formed by a portion where a character or figure to be a stamp face is formed and the remaining portion and that can obtain a difference in infrared transmittance is used. Specifically, a transparent sheet or a white opaque sheet is used. Characters or figures drawn with heat-generating ink that generates heat when irradiated with infrared rays on one side, or letters or figures such as PPC paper or OHP paper by a copying machine formed as an infrared-absorbing film on the sheet surface, paper Examples include letters or figures drawn with ink or transfer tape (white type character correction tape, etc.) that reflects infrared rays on one side, or punched letters or figures on a sheet that does not transmit infrared rays. be able to.
Next, after wrapping the original sheet with a release film such as a laminate film that can transmit infrared rays, the original sheet 2 of the present invention is obtained by cutting the original sheet into approximately the same size as the outer periphery of the unitized stamp. .
Next, the document 2 is cut into a required size and placed in the guide jig 1. Further, the unitized stamp is placed in the guide jig 1 from above.
Next, a pressing jig 9 is placed on the unitized stamp, and infrared light is applied while applying pressure of clamping between the pressing plate 14 and the transparent plate 17 so that the porous stamping material 3 and the document 2 are in close contact with each other. The surface layer of the surface of the porous stamping material 3 that is heated by the transmission of infrared rays is melted and solidified under the heat of fine powder of heat generating material such as carbon mixed therein, so that the ink cannot exude. The remaining surface of the porous printing material corresponding to the portion of the original having a low infrared transmittance is formed on the ink bleeding surface to form characters and the like.
It is preferable to use a stamp by connecting a grip member 6 for firmly grasping by hand to the joint portion of the stamp holder 4 because the usability is improved.
The stamp created using this embodiment is such that the melted protrusion and the melted stamping material are fusion bonded so that the protrusion of the stamp holder overlaps the peripheral edge of the stamping material on the lower end surface of the frame. Formed on top. As a result, even when the stamping was repeated hundreds of thousands of times, the peripheral edge of the stamping material did not come off from the stamp holder or the gap was not opened. In addition, since the printing material and the stamp holder could be securely fixed, the sealing property was excellent and ink evaporation and ink leakage could be prevented.

Although not specifically shown, first, a mixture of 100 parts by weight of a polyethylene resin having a melting point of 70 ° C., 20 parts by weight of polyethylene glycol having a molecular weight of 400, and 350 parts by weight of sodium chloride having a particle size of 10 to 60 μm is mixed with some carbon black. Then, a sheet-like original member having a thickness of 2.0 mm is created.
Next, the original member is immersed in warm water to completely remove polyethylene glycol and sodium chloride, and then sufficiently dried to obtain a grayish porous sheet having a thickness of 2.0 mm.
Next, when a mold engraved with a letter or the like is heated to about 100 ° C., a porous sheet is accommodated and a light force is pressed, the part touching the mold is melted and solidified, and the ink cannot exude. A porous protective film is formed, and a portion such as a concave character that has not touched the mold forms an ink bleeding surface as a remaining portion.
Next, this porous sheet is cut into a required size with a cutter to obtain a porous printing material made of a thermoplastic resin. At this time, when an ultrasonic cutter is used, a porous printing material in which the cut surface is melted and solidified simultaneously with cutting can be obtained.
Next, a stamp holder made of polyethylene having a melting point of 70 ° C. and formed with a joint portion on the upper side and a frame for accommodating the porous stamping material on the lower side is prepared, and the porous stamping material is accommodated in a state protruding from the frame. . An ink occlusion body is also accommodated on the back surface of the porous printing material. Further, a protrusion is provided at the center of the lower end surface portion of the frame. Protrusions should be installed in the center at a distance from the side of the frame.
Next, a polyethylene terephthalate film is placed on the surface side of the porous stamp as a protective film.
Next, a heat sealing jig having a sufficient size capable of simultaneously melting the entire circumference of both the porous printing material and the frame is prepared, heated to about 100 ° C., and then pressed against the porous printing material and the frame. When pressing is started, the peripheral edge of the porous stamp material is first melted, and the protrusions provided on the frame are subsequently melted. When it is released after about 3 seconds while being pressed, it is fusion-bonded over the entire circumference in a shape in which the molten portion of the protrusion overlaps the molten portion of the porous stamping material. Moreover, the junction part formed by both melting is formed on the lower end surface part of a flame | frame.
Next, when the protective film is removed, the stamp of Example 2 in which characters and the like are already formed can be obtained.
It is preferable to use a stamp by connecting a grip member 6 for firmly gripping by hand to the joint portion of the stamp of Example 2 because the usability is improved.
The stamp created using this embodiment is such that the melted protrusion and the melted stamping material are fusion bonded so that the protrusion of the stamp holder overlaps the peripheral edge of the stamping material on the lower end surface of the frame. Formed on top. As a result, even when the stamping was repeated hundreds of thousands of times, the peripheral edge of the stamping material did not come off from the stamp holder or the gap was not opened. In addition, since the printing material and the stamp holder could be securely fixed, the sealing property was excellent and ink evaporation and ink leakage could be prevented.

A state where the stamp material is stored in the stamp holder State with protective film Fusion bonding state Description of fusion joint Disassembly state of stamp Creation process of characters Assembly state diagram

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Guide jig 2 Original 3 Porous sealant 4 Stamp holder 4a Joint part 4b Frame 4c Protrusion 6 Grip member 9 Pressing jig 14 Pressing plate 17 Transparent plate 30 Protective film 40 Heat sealing jig

Claims (2)

A stamp material made of a thermoplastic resin, and a stamp holder having a frame for holding the stamp material; provided with a projection on a lower end surface portion of the frame; and accommodated in the stamp holder in a state of projecting the stamp material from the frame; In a stamp formed by fusion-bonding the peripheral edge portion of the stamping material and the lower end surface portion of the frame, the peripheral edge portion of the stamping material and the protrusion are fusion-bonded over the entire periphery on the lower end surface portion of the frame. Characteristic stamp. The stamp according to claim 1, wherein the stamp is a porous stamp made of a thermoplastic resin having continuous pores.

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