JPH04312881A - Stamp pad - Google Patents

Abstract

PURPOSE:To improve durability by enabling high quality printing to be performed by a method wherein knitting fabrics of synthetic fiber filament of one denier or under in single yarn fineness is used for a board surface cloth. CONSTITUTION:After knitting by using composite fiber knitting fabrics consisting of each portion having a radial form and a form supplementing it, fine size filaments are formed by fibrilation. Density in knitting product is 64 warps/inch, 62 wefts/inch and 81900 single yarn fibers per 1 inch. A board surface cloth 4 is formed by cutting in 6X9.5cm, which is laminated above wool felt 2 to construct a stamp pad. Since speckling of ink in sealing is almost gone and discharge of the ink can be also controlled to a suitable quantity, a clear sealed impression can be obtained. Besides, clogging in a seal is decreased by restraining fuzzing from felt, and durability of the baord surface cloth itself can be improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stamp pad using a woven or knitted fabric made of ultra-fine synthetic fiber filaments.

0002

[Prior Art] As shown in FIG. 6, the structure of a stamp pad normally used as an office supply is such that felt (2), nonwoven fabric (3), and board cloth (4) are sequentially placed on a bottom plate (1). It has a layered form.

[0003] According to the JIS standard, the stamp pad must be made of ``the stamp bed is mainly made of felt or partially made of sponge, and the cloth on the board is made of cotton thread of 40 or more, and the average number of stamps in the weft and warp is 170 or more threads per 5 cm. Cotton cloth is generally used as the cloth for the board surface.

[0004] Conventional problems with such stamp pads are: [1] mottling of the stamp due to ink mottling during stamping; [2] irregularity of the stamp and marks on the stamp due to fuzz on the board cloth. Clogging [3] Lifespan of the stamp holder due to the durability of the cloth on the board [4] Lifespan of the stamp holder due to ink drying.

[0005] Conventionally, as base materials for stamp pads, there have been those described in Japanese Patent Publication No. 11538/1983 that use regenerated cellulose having a microfibril structure, and those that are made of fine fiber nonwoven fabric impregnated with urethane. Utility Model Application Publication No. 64-40562 is known.

[0006]

[Problems to be Solved by the Invention] However, the method described in Japanese Patent Publication No. 51-11538 uses regenerated cellulose fibers having a microfibril structure, that is, fine pores, which improves the water retention of ink. Although it was possible to extend the life of the ink on the stamp pad, it was not possible to improve the ink mottling and the durability of the cloth on the stamp pad.

Furthermore, in the method described in Utility Model Application Publication No. 64-40562, it is difficult to industrially obtain a high-quality stamp pad because the impregnation state of the polymer elastic body must be precisely controlled. .

[0008] The present invention solves this problem, and while employing the structure of a conventional stamp pad, high-quality stamping is possible by using a specific woven or knitted fabric as the pad cloth. The object of the present invention is to provide a durable stamp pad.

[0009]

[Means for Solving the Problems] The present invention has a single yarn fineness of 1
This stamp pad uses a woven or knitted fabric made of synthetic fiber filaments of denier or less as the board cloth.

[0010] In the present invention, the synthetic fiber filaments having a single filament fineness of 1 denier or less include nylon 6, nylon 6
Examples include polyamides such as No. 6, polyesters such as polyethylene terephthalate, polybutylene terephthalate, and copolymers thereof, and synthetic polymers such as polyacrylic. It is preferable to use

[0011] Natural fibers, such as cotton, are often water-absorbent and absorb ink, making them unsuitable, and since they are short fibers, fuzz is generated. Furthermore, although silk and the like have fine fineness, their strength when wet is low, and as a board cloth, durability when absorbing ink becomes a problem. Therefore, synthetic fiber filaments, polyesters, polyamides, and the like, which have little loss of strength when wet, are preferred.

[0012] Furthermore, fibers with a single yarn fineness of 1 denier or less are
The target fineness yarn may be directly spun, or a composite fiber made of two types of polymers having different physical properties may be made fine by means such as dissolving or splitting, and it is more preferable to make the fineness of the yarn to be 0.2 denier or less.

However, in view of the ease of production, the fabric density described later, the affinity of the polymer for ink, etc., it is not possible to fabricate a woven or knitted fabric using fibrillated composite fibers made of polyamide and polyester and then fibrillate it. preferable.

Various types of fibrillated composite fibers are known, but the following are particularly preferred for this stamp pad. In other words, it is a composite fiber having a shape in which a polyamide component and a polyester component are joined together without completely surrounding one component with the other in any cross section of a single filament. Specifically, composite fibers with a side-by-side cross section (Figure 4), composite fibers with a side-by-side repeating type (Figure 5), and composite fibers consisting of a portion with a radial shape and another component with a shape that complements the radial portion. These include fibers (FIGS. 1 and 2), composite fibers (FIG. 3) in which a hollow portion is provided in the same shape, and the like.

Among these composite fibers, composite fibers (FIGS. 1 and 2) consisting of a portion having a radial shape and another component having a shape that complements the radial portion are particularly preferred for use in the present stamp pad. It is preferable that polyamide be used as the portion having a radial shape, and polyester be used as the portion having a shape that complements the radial portion, and that the fineness of the segment is 0.2 denier or less.

Next, a woven or knitted fabric using the synthetic fiber filament as described above will be described. Although various textures can be adopted as the texture of such a woven or knitted fabric, a smooth texture is preferable from the viewpoint of ink adhesion, and a knitted fabric is preferably used since it is possible to fix the board cloth flatly using appropriate stretchability. preferable. Among these, high gauge smooth etc. are most preferable.

It goes without saying that the main woven or knitted fabric may contain other fibers in addition to the synthetic fibers as long as they do not affect the function.

[0018] In the case of the conventional board cloth made of cotton cloth, a general cotton thread of about No. 42 has a denier equivalent of 1
．． 2 denier, and the fiber surface area is 3000cm2/
It is about g. On the other hand, when the single yarn fineness is 1.0 denier or less, the irregular cross-section yarn of 1.0 denier (for example, the oblateness 1
0.1 denier round cross-section yarn has a much larger surface area of 9600 cm2/g.

Such wide surface area fibers can increase the total surface area of the fibers without increasing the number of constituent fibers present within the same area. Therefore, sufficient capillarity and surface flatness can be obtained, and the contact area between the ink and the stamp can be increased.

[0020] Therefore, in the case of the main board surface cloth, it is preferable that the fiber surface area per cm2 is at least 200 cm2. In the case of cotton fabric using 42nd cotton thread, the usual threading rate of about 100 threads/inch is 50 cm.
The fiber surface area is only about 2.

However, although the surface area is also related to the ink, if the surface area becomes too large, the ink dischargeability will deteriorate. Therefore, the surface area is preferably about 400 cm2 at most.

Furthermore, the number of single fibers is inch2
It is preferable to keep the number to about 10,000 per unit.

Next, a method for efficiently manufacturing the above-mentioned board cloth will be described. In this manufacturing method, a composite fiber is used in which polyamide is used as the portion having the aforementioned radial shape, and polyester is used as the portion having a shape that complements the radial portion.

In other words, after weaving a woven or knitted fabric using the composite fiber, the composite fiber is fibrillated to form fine filaments. As such a fibrillation method, known methods described in Japanese Patent Publication No. 53-35633 and the like can be used, but a method using benzyl alcohol is most preferred.

An example of this process is a method in which benzyl alcohol is applied to a woven or knitted fabric by a padding method or the like to open the fibrillated composite fibers, followed by washing with water, drying, and heat setting.

[0026] In this step, the temperature for treatment with benzyl alcohol is preferably 40°C to 60°C.

[0027]Furthermore, following the opening process, a shrinkage process using saturated steam or the like may be carried out, but as mentioned above, it is not necessarily preferable to increase the density of the woven or knitted material too much, so it is preferable to consider the degree of shrinkage. .

[0028] In the drying step, a continuous dryer using a heater may be used, but it is more preferable to use a tumbler dryer or the like which can impart a massaging effect.

Furthermore, it goes without saying that the main woven or knitted fabric may be subjected to various post-processing processes. During post-processing, it is preferable to treat the main woven or knitted fabric with tannic acid. In this case, dimensional stability is improved by dipping the woven or knitted fabric in a water-washing tank or the like in which tannic acid is dissolved.

[0030] Using the above woven or knitted fabric as a board cloth,
When constructing a stamp pad, the woven or knitted fabric may be used in place of the cotton fabric of a conventional stamp pad that uses cotton cloth, but in the structure of the stamp pad shown in FIG. There is no need for this stamp pad as long as it is used for the purpose of preventing fuzz.

Furthermore, although various inks can be used for this stamp pad, dye-based ink with a particle size of 1 μm or less (100 cp
s or less), the above-mentioned upper limit of the density of the woven or knitted fabric is not so relevant.

On the other hand, when using a pigment-based ink with a particle size of about 10 to 20 μm (several 100 cps), the above-mentioned upper limit of fabric density has a large effect. In this stamp pad, it is preferable to use oil-based dye-based ink because a wide variety of printing papers can be used and it dries quickly.

[0033]

[Example] 6 having a radial shape whose cross section is shown in Fig. 1
An interlock structure was knitted using a 40G x 33'' knitting machine using composite fibers 40d/25f using polyamide as each segment and polyester as eight segments having a shape that complemented the radial part.

[0034] The knitted fabric was immersed in benzyl alcohol with a concentration of 20%, and then washed with water in an open soaper at room temperature.
After drying using a tumble dryer, heat setting was performed at 120°C. Note that tannic acid was added to the final tank of the open soaper to a concentration of 1.5%. (Example 1)

[
[0035] The product density of the knitted fabric is 64 warps/inch,
The weft is 62/inch, and the number of single fibers per inch2 is 81,900, and when the knitted fabric is cut into 6 x 9.5 cm to make a board cloth, the fiber surface area is 3,224.
It was 4cm2.

[0036] In the above step, after applying benzyl alcohol, it is passed through hot water at 90°C to reduce the temperature by 45% in the latitudinal direction.
A knitted fabric treated in the same manner except for shrinkage (Example 2)
A knitted fabric (Example 3) which was further subjected to water absorption treatment was manufactured.

On the other hand, a plain knitted fabric using 42 count single yarn made of cotton yarn, warp 90 yarns/inch, weft 81 yarns/inch (
Comparative Example 1) was prepared and evaluated. In other words, after dropping ink onto the knitted fabric, the time required for the swelling due to surface tension to disappear due to water absorption of the ink was measured (dropping method). The results are shown in Table 1.

[0038]

[Table 1]

[0039] Further, the tip of a knitted fabric having a width of 2.5 cm and a length of 20 cm was immersed in ink for 2.0 cm, and the length of the ink sucked up by capillary action was measured (Bylek method). The results are shown in Table 2.

[0040]

[Table 2]

Furthermore, each knitted fabric was laminated on top of wool felt to produce a stamp pad, impregnated with an oil-based dye, and stamped with a rubber letter stamp. The results are shown in Table 3.

[0042]

[Table 3]

[0043]

Effects of the Invention According to the present stamp pad, ink spotting during printing is almost eliminated, and ink discharge can be controlled to an appropriate amount, resulting in a clear stamp impression.

Furthermore, this stamp pad can be used for a long period of time because the fuzz from the felt inside the stamp pad is suppressed, which reduces clogging of the stamp, and the board cloth itself is highly durable. is possible.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a fibrillated composite fiber that can be used for the main panel cloth.

FIG. 2 is a cross-sectional view of a fibrillated composite fiber that can be used for the main panel cloth.

FIG. 3 is a cross-sectional view of a fibrillated composite fiber that can be used for the main panel cloth.

FIG. 4 is a cross-sectional view of a fibrillated composite fiber that can be used for the main panel cloth.

FIG. 5 is a cross-sectional view of a fibrillated composite fiber that can be used for the main panel cloth.

FIG. 6 is an explanatory diagram showing the structure of a stamp pad.

Claims (1)

[Claims] 1. A stamp pad using a woven or knitted fabric made of synthetic fiber filaments with a single yarn fineness of 1 denier or less as the board cloth.