JPH06234262A - Stamping shape of rubber printing member - Google Patents

Abstract

PURPOSE:To perform sealing under more reduced pressure and to reduce the consumption amt. of ink by making the cross section of a printing plate rectangular and forming the shapes of respective parts so as to allow the depth of the corner curved part of a printing surface to approach zero. CONSTITUTION:In a rubber printing plate formed by laser beam, the cross-sectional shape of the printing plate is formed from a printing surface pattern holding part A having the same cross-sectional width as the pattern width (d) of a printing surface, the trapezoidal part B of the printing surface supporting the holding part A and the base bottom part C of the printing plate. The shoulder of the trapezoidal part B of the printing plate is set to a slope state and the expanse (e) of this base is set to 30 times or less the scanning feed pitch 30 of laser beam. Further, the ratio of the relief depth (a) from the upper surface of the printing plate and the total carving depth a+b is set to l:99-99:1. The thickness (c) of the base bottom part C of the printing plate is set to 20-90% of printing material width a+b+c. By this constitution, sealing can be performed under more reduced pressure and the consumption amt. of ink can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber stamp and a stamped shape of a rubber printing body. Specifically, it relates to a rubber stamp by laser processing and its stamped shape.

[0002]

2. Description of the Related Art Conventionally, laser beams have been used to engrave hard rubber, synthetic resin, wood, buffalo horns, etc., which are generally hard materials. For the laser engraving and engraving device, see Japanese Patent Publication No. 56-
40034, 57-5184, 57-41343, and the like. The engraving method is described in JP-B-56-27388, 56-40033, 59-31.
435, 62-4231 and the like.

Since the laser beam is suitable for fine processing, it is considered that it was used for engraving a stamp. Japanese Examined Patent Publication No. 56-40034 describes that the processed cross section of the stamp is engraved in a concave shape or a step shape. However, if the shoulder of the trapezoidal portion (B) of the printing material is stepped, the total engraving depth (a +
When b) is larger than 0.8 mm, it is evaporated by the laser beam, a foamy deposit layer is formed, and the stamp material is burned by the heat of the laser beam to form a discoloration layer. It adheres firmly to the surface and becomes difficult to remove.
Using a metal brush to remove these deposits and tarnishes damages the normal relief. Therefore, a method of attaching a resist film to the stamp surface, engraving with a laser, and then sandblasting the stamp surface (Japanese Patent Publication No. 56-40033).
It has been known. However, with the engraved shape of the stamp obtained by these methods, the printing imprinted using this stamp is unsatisfactory and unsatisfactory. Further, when the processed cross section is concave or stepped, the strength of supporting the seal surface pattern body portion (A) is insufficient when the top surface of the seal is pressed from above, which is important for imprinting the seal, and the seal image is not clear. In addition, the root of the convex portion of the cross section of the stamp face has a drawback that stress concentrates on the left and right forces and is easily chipped during handling.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems with the conventional stamped shape. That is, the purpose is to provide a stamp with which clear printing can be obtained and a new marking cross-sectional shape.

[0005]

As a result of earnest research to solve the above-mentioned problems of the prior art, the present inventor has found a special rubber stamp engraving shape that allows clear printing, and completes the present invention. Came to.

The rubber stamp of the present invention is a rubber stamp formed by a laser beam, and the stamp judgment surface shape is (A) a stamp surface pattern holding portion having the same cross sectional width as the pattern width (d) of the stamp surface, ( B) comprises a (A) trapezoidal trapezoidal portion for supporting the print-print-pattern-holding portion, and (C) a print base portion.
The shoulder of the part has a slope shape, and the spread (e) of the base is within 30 times the scanning feed pitch of the laser beam, and the relief depth (a) and the total engraving depth (a + b) from the upper surface of the stamp are The ratio is 1:99 to 99: 1, and the thickness (c) of the stamp base portion is the stamp material width (a + b +
It is characterized by being 20 to 90% of c).

The rubber stamp stamped shape of the present invention is (A) a stamp surface pattern holding portion having the same cross sectional width as the pattern width (d) of the stamp surface, and (B) a trapezoidal surface portion for supporting the stamp surface pattern holding portion (A). , And (C) a stamp base portion, the depth of the stamped surface curved portion (g) is close to 0, the shoulder of the (B) portion is slope-shaped, and the base spreads ( e) is within 30 times the scanning feed pitch of the laser beam, and the ratio of the relief depth (a) from the stamp upper surface to the total engraving depth (a + b) is 1: 99-9.
It is 9: 1, and the thickness (c) of the printing base portion is 20 to 90% of the width (a + b + c) of the printing material and is characterized by being formed by a laser beam.

In the stamped shape of the rubber stamp relief of the present invention, the cross-section of the (A) stamp surface pattern body portion is a square or a rectangle (A portion in FIG. 1), and as shown in FIG. 3 (a). There may be one or more. The depth (t) of the curved portion (s) of the stamp face varies depending on the rubber material, but it is less than half that of conventional rubber stamps, and is very small, such as 0.05 mm or less, 0.02 mm or less, 0.01 mm or less. The feature is that it is small. Further, the cross section of the trapezoidal trapezoidal portion in (B) is a ladder shape in a broad sense. The spread (e) of the base is proportional to the scanning feed pitch of the laser beam,
Specifically, 0.02 to 15 mm is preferable. By making the size of (e) wide, it is possible to prevent the print surface from being bent or deformed.

The relief engraving depth (a) and the total engraving depth (a + b) from the top surface of the stamp in the mark judgment surface shape according to the present invention.
The ratio of and is 1:99 to 99: 1, preferably 1:10, more preferably 1: 3.5. The printing material width (a + b + c) is not particularly limited, but is preferably 2 to 10 mm. Total engraving depth (a + b) is usually 0.2 to 1
It is 5 mm. By making the relief depth (a) large, especially the inside of the pattern can be deeply engraved and the imprint is good. The engraving depth depends on the material and hardness,
0.1 to 10 mm is preferable.

The rubber stamp material of the present invention can be selected in a wide range of materials, hardness and thickness, and natural rubber, SBR type, two-layer or stabilizer rubber, porous rubber and the like can be used. It is preferable that a material adapted to the above can be selected. The hardness is 20 to 90 °. Examples of the raw material rubber of the rubber stamp material used in the rubber stamp of the present invention include natural rubber, styrene, butadiene rubber (SBR), and acrylonitrile-butadiene copolymer rubber (NBR). Usually, a rubber stamp material is produced by mixing 50 to 150 parts by weight of filler, preferably 50 to 100 parts by weight with respect to 100 parts by weight of raw rubber. Crosslinking accelerator 1-2, sulfur 1-
3, plasticizer 0 to 10 in weight ratio. As the filler, white powder (shell), clay, calcium carbonate,
Talc (magnesium silicate) and the like can be mentioned.

The method of forming the engraved portion by laser processing of the stamp of the present invention, that is, the method of forming the printing surface is as follows.
A manuscript having a print pattern is prepared by typesetting and printing, and then the print pattern is scanned and data processed by an image scanner, and based on the data, the rubber stamp material is directly irradiated with a laser beam to engrave the pattern. The operation is processed by a computer. Specified rubber stamp width (a
The rubber stamp processed into + b + c) is wound around a cylindrical drum, the drum is rotated, and the laser beam is scanned vertically along the axis of the drum. The peripheral speed of the cylindrical drum is 15
A range of 0 to 220 cm / s and a scanning pitch of 25 to 50 μ are practically usable. When the peripheral speed of the drum is slow, the energy per unit time irradiated on the rubber plate increases, the depth of engraving from the stamp surface becomes deeper, which is not practical and requires processing time, and consumes gas and electricity. And so on. When the peripheral speed is fast, productivity and economy are good, but the carved depth is insufficient and the imprint is not clear. A carbon dioxide laser is usually used as the laser light, the intensity is 50 to 1200 W, and the spot size is 50 to 100 μm.

The rubber stamp adheres the stamp ink to the stamp surface (print pattern surface) f and presses it on a document or the like for printing. At the time of printing, the printing surface f comes into contact with a printing object such as a document surface, and the ink is transferred to the printing object by pressure compression of the printing surface pattern holding portion (A). The rubber stamp of the present invention is unprocessed except for the engraved portion, because it is not irradiated with laser light. Therefore, the surface of the material is stable. The porous rubber infiltration mark containing ink has a great advantage that it can be processed by taking advantage of the characteristics of the material and that the amount of ink outflow can be easily controlled later.
In the case of the penetration mark, the porous rubber material contains ink,
The ink is extruded by pressure compression. Therefore, the force of pressing the rubber print from above greatly affects the imprint. The cross section of the conventional stamp has a trapezoidal shape as shown in FIG. 2B, but the cross section of the rubber stamp of the present invention has a rectangular cross section as shown in FIG. 2A. Therefore, when printing the pattern width (d), the conventional stamp of FIG. 2 (b) has a large depth t of the curved portion of the stamp face and a large compression force is required to obtain the pattern width (d). The rubber stamp of the present invention (Fig. 2 (a))
In this case, since the depth t of the curved portion at the corner of the stamp face is close to 0, an extremely smaller compression force than the conventional one is required. Therefore, the rubber stamp of the present invention consumes less ink and can increase the number of times of printing with one ink application. Further, the width of the imprinted pattern is constant irrespective of the compression force, so that there is little variation. For example, taking the stamp face of the character "mouth", FIG. 3 (a) shows the stamp face and cross section of the stamp of the present invention, and (b) shows the stamp face and cross section of the conventional stamp.

[0013]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

Example 1 a) A rubber plate (thickness: 2.8) for a rubber stamp material having the following composition.
mm) was processed. SBR 100 parts by weight Zinc white 5 parts by weight Stearic acid 1 part by weight Dibenzothiazyl disulfide 1 part by weight Tetramethyl thiuram monosulfide 0.2 parts by weight Sulfur 1.2 parts by weight Filler (clay) 50 parts by weight Filler (salt) 50 parts by weight Department

B) A rubber stamp having a width of 2.8 mm is wound around the entire circumference of a cylindrical drum. The peripheral speed of the cylindrical drum is 190 cm / s and the scanning pitch is 4 by the operation by computer control.
0 μ, and the engraving depth (a) and (a +
b) and 18% of the width of the printing material, respectively, and the base expansion (e) was set to 0.56 mm. c) The cylindrical drum was rotated under the above conditions, and the rubber stamp material was irradiated with a laser to engrave a pattern. The laser beam was scanned at a right angle along the axis of the cylindrical drum. As for the laser conditions, a carbon dioxide laser is used and the intensity is 400
W, spot size was 80μ. d) When the rubber stamp material is laser-processed, most of the rubber compounding components in the stamped portion volatilize, but a part remains as a residue and clogs in the recessed portion of the stamped portion. This was subjected to alkali treatment, and then washed with an automatic washing machine for 5 minutes to produce a rubber stamp.

E) (A) Cross-section of the stamped shape of the rubber stamp after processing The cross-section of the pattern body portion is square, the engraving depth (a) from the top surface of the stamp is 0.5 mm, and (a + b) is 1.
It is 35 mm. The cross section of the trapezoidal trapezoidal portion of (B) is
(A) The shoulder has a wider slope. The thickness (c) of the stamp base portion is 1. with respect to the stamp material width of 2.8 mm.
It was 45 mm. f) The rubber stamp was attached to the handle to make a rubber stamp.

[0017]

Since the stamp of the present invention has a rectangular cross section and the depth of the curved portion of the stamp face is close to 0, it is possible to stamp with less pressure than before. In addition, the ink consumption is low, and a large number of markings can be made with one ink application. Also, there is little variation in the width of the imprinted pattern.

[Brief description of drawings]

FIG. 1 is a sectional view of a rubber stamp according to the present invention.

FIG. 2 is a difference between a rubber stamp (a) of the present invention and a conventional rubber stamp (b).

FIG. 3 is a difference in the engraved shape of the character “mouth” and the cross-sectional shape.

[Explanation of symbols]

 A seal face pattern holding portion B seal face trapezoidal portion C seal base portion D handle base a relief depth (a + b) total engraving depth (a + b + c) stamp width d stamp width trapezoidal area f stamp surface (stamp surface) s stamp surface Corner curved portion h Marking object t Marking surface Corner curved portion depth

Claims (2)

[Claims] 1. A rubber stamp formed by a laser beam, wherein the stamp judgment surface shape is (A) a stamp surface pattern holding portion having the same cross-sectional width as the pattern width (d) of the stamp surface, and (B) said (A). )
The trapezoidal portion of the stamp surface supporting the stamp pattern holding portion, and (C)
The base of the stamp has a shoulder-like shape, and the shoulder of the stamp (B) has a slope (e) within 30 times the scanning feed pitch of the laser beam and the relief depth (a) from the upper surface of the stamp. ) And total engraving depth (a + b)
And the thickness (c) of the stamp base portion is 20 to 90% of the stamp width (a + b + c).
A rubber stamp formed by a laser beam. 2. A stamp surface pattern holding portion having (A) a stamp surface pattern width (d) which is the same as a cross sectional width, (B) a stamp surface trapezoidal portion which supports the stamp surface pattern holding portion (A), and (C) a stamp base. Has a cross-sectional shape consisting of a part, and a curved surface (s) of the stamp face
Is close to 0, the shoulder of the portion (B) is slope-shaped, the base spread (e) is within 30 times the scanning feed pitch of the laser beam, and the relief depth from the upper surface of the stamp ( The ratio between a) and the total engraving depth (a + b) is 1:99 to 99: 1, and the thickness (c) of the stamp base portion is 20 to 90% of the stamp width (a + b + c). A rubber stamp engraved with a laser beam.