JP2907578B2 - Stamp pad - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Generally, a stamp base used as office supplies has a felt (2), a nonwoven fabric (3) and a board cloth (4) on a bottom plate (1), as shown in FIG. It has a laminated form.

According to the JIS standard, the stamp base is formed such that the stamped floor is mainly made of felt or a part of sponge, and the board surface cloth is cotton yarn of 40 count or more, and the average number of the driving lines is 170 or more per 5 cm. As the board surface cloth, cotton cloth is generally used.

[0004] In such a stamp stand, the problems that have conventionally arisen are: [1] spots of imprint due to ink spots during printing [2] disturbance of imprint due to fluffing of surface cloth, and eyes of seal stamps. Clogging [3] Life of stamp base due to durability of board cloth [4] Life of stamp base due to drying of ink.

[0005] Conventionally, as a material for a stamp base, those described in JP-B-51-11538 using regenerated cellulose having a microfibril structure and those obtained by impregnating a fine-fiber nonwoven fabric with urethane are disclosed. For example, Japanese Utility Model Application Laid-Open No. 64-5622 is known.

[0006]

However, the one described in Japanese Patent Publication No. 11538/1979 uses regenerated cellulose fibers having a microfibril structure, that is, micropores, to improve the water retention of ink. Thus, the life of the ink on the stamp stand can be extended, but the unevenness of the ink and the durability of the board surface cloth cannot be improved.

[0007] Further, in Japanese Unexamined Utility Model Publication No. Sho 64-40562, it is necessary to precisely control the state of impregnation of the elastic polymer, and it is difficult to industrially obtain a high-quality stamp base. .

The present invention has been made to solve the above problem, and high quality printing can be performed by using a specific woven or knitted fabric as the surface cloth while employing the structure of the conventional stamp table. Another object of the present invention is to provide a durable stamp base.

[0009]

SUMMARY OF THE INVENTION The present invention provides a radial type
And a shape that complements the radiating section.
Conjugated polyester fiber
Single fiber fineness of 1 using fibrillation with coal
A stamp base using a woven or knitted fabric using a synthetic fiber filament of denier or less as a board cloth.

In the present invention, the synthetic fiber filament having a single yarn fineness of 1 denier or less is defined as nylon 6, nylon 6 or the like.
Polyamides such as 6, polyamide terephthalate, polybutylene terephthalate, polyesters such as copolymers thereof, and synthetic polymer polymers such as polyacrylic can be mentioned. As described later, both components of polyamide and polyester are used. Preferably, it is used.

[0011] Natural fibers, such as cotton, are often unsuitable because they absorb a large amount of water and absorb ink. Moreover, short fibers cause fluff. Further, silk and the like have a fine fineness, but have low strength when wet, and thus, a board cloth has a problem in durability when absorbing ink. Therefore, synthetic fiber filaments, polyesters, polyamides, etc., which have a small decrease in strength when wet, are preferred.

Further, the fibers having a single yarn fineness of 1 denier or less are
Obtained by small fineness by means of dissolution or break such a conjugate fiber composed of two Porima of different things property, further preferably follows That raise particular 0.2 denier.

However, in view of the ease of production, the fabric density described below, the affinity of the polymer for the ink, and the like, it is necessary to form a woven or knitted fabric using a fibrillated composite fiber made of polyamide and polyester and then fibrillate. preferable.

Various types of fibrillated conjugate fibers are known, but the following are particularly preferred for the stamp base. That is, the polyamide component and the polyester component are composite fibers having a shape in which both components are joined without completely surrounding one component in any cross section of a single filament, More specifically, the composite fiber has a cross section of a side-by-side type composite fiber (FIG. 4), a side-by-side repetition type composite fiber (FIG. 5), a portion having a radial shape and another component having a shape complementary to the radiation portion. There are fibers (FIGS. 1 and 2) and composite fibers (FIG. 3) having a hollow portion in the shape.

Of these composite fibers, the stamp base is particularly preferably a composite fiber (FIGS. 1 and 2) comprising a portion having a radial shape and another component having a shape complementary to the radiation portion. It is preferable that a polyamide having a radial shape and a polyester having a shape complementary to the radiating portion be used, and the fineness of the segment be 0.2 denier or less.

Next, a woven or knitted fabric using the above-mentioned synthetic fiber filament will be described. Although various structures can be adopted as the structure of the woven or knitted material, a smooth structure is preferable in view of the ink adhesion, and it is preferable to use a knitted material in view of the fact that the board cloth can be fixed flat by using an appropriate stretch property. preferable. From these, high gauge smoothness is the most preferable.

It is a matter of course that the present woven or knitted fabric may contain other fibers in addition to the synthetic fibers as long as the function is not affected.

Here, in the case of a board cloth made of a conventional cotton cloth, a cotton yarn of about 42 counts of a general product is 1.2 denier in terms of denier, and the fiber surface area is 3000 cm ² /.
g. On the other hand, when the single yarn fineness is 1.0 denier or less, a modified cross-section yarn of 1.0 denier (for example, a flatness of 1 denier)
Round cross section fiber of 6000cm ² /g,0.1 denier flat yarn) of 0 has a much wider surface area 9600cm ² / g.

Such a high surface area fiber can increase the total surface area of the fiber without increasing the number of constituent fibers existing in the same area. For this reason, a sufficient capillary phenomenon and flatness of the surface can be obtained, and the contact area between the ink and the stamp can be increased.

[0020] Thus, in this board cloth, fiber surface area per 1 cm ² is preferably at least 200 cm ² there. In the case of a cotton woven fabric using a 42th-number cotton yarn, a typical driving of about 100 yarns / inch has only a fiber surface area of about 50 cm ² .

However, although the surface area is related to the ink, if the surface area is too large, on the contrary, the ejection property of the ink is deteriorated.

Furthermore, the number of single yarn fiber is preferably kept to 10000 0 present approximately per inch ^2.

Next, a description will be given of a method of efficiently manufacturing the above-mentioned board cloth. In the manufacturing method, a composite fiber using polyamide is used as a portion having the above-described radiation type shape, and a polyester is used as a portion having a shape complementary to the radiation portion.

That is, after knitting and weaving a woven or knitted product using the composite fiber, the composite fiber is fibrillated to form a fine filament. As such a fibrillation method, a known method described in JP-B-53-35633 or the like can be used, but a method using benzyl alcohol is most preferable.

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

In this step, the treatment temperature with benzyl alcohol is preferably from 40 ° C. to 60 ° C.

Although a shrinking step using saturated steam or the like may be carried out subsequent to the fiber opening step, it is not always preferable to increase the density of the woven or knitted material as described above, so it is preferable to consider the degree of shrinkage. .

In the drying step, a continuous dryer using a heater may be used, but a tumbler dryer or the like that can impart a kneading effect is more preferable.

Further, it is a matter of course that various post-processing may be applied to the main woven or knitted fabric. 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 dissolving tannic acid in a washing tank or the like and immersing the woven or knitted fabric.

Using the woven or knitted fabric as described above as a surface cloth,
When forming the stamp base, the woven or knitted fabric may be used instead of the conventional cotton cloth of the stamp base using a cotton cloth. In the structure of the stamp base shown in FIG. 6, the nonwoven fabric (3) is made of felt (2). There is no need for this stamp stand as long as it is used for the purpose of preventing fluff.

Further, various inks can be used for the stamp stand, but dye-based inks having a particle size of 1 μ or less (100 cp) can be used.
s or less), the upper limit of the density of the woven or knitted fabric has little relation.

On the other hand, when a pigment-based ink (several hundred cps) having a particle size of about 10 to 20 μm is used, the influence of the upper limit of the cloth density is large. In the present stamp stand, oil-based dye-based inks are preferably used because they can use a wide range of printing papers and are fast-drying.

[0033]

5 having a radiating shape showing the cross section in Embodiment Figure 1
An interlock structure was knitted with a 40 G × 33 ″ knitting machine using composite fibers 40 d / 25 f using polyamide as the segments and polyester as the eight segments having a shape complementary to the radiating portion.

After immersing the knitted fabric in benzyl alcohol at a concentration of 20%, the fabric is washed with an open soaper at room temperature,
After drying using a tumbler dryer, it was heat-set at 120 ° C. Note that tannic acid was added to the final tank of the open soaper so as to have a concentration of 1.5%. (Example 1)

The product density of the knitted fabric is 64 yarns / inc.
h, weft 62 / inch, the number of single yarn fibers per 1 inch ² is 81900, and the knitted fabric is 6 × 9.5 cm.
The surface area of the fiber was 322
44 cm ² .

In the above step, after the benzyl alcohol is applied, the benzyl alcohol is passed through hot water at 90 ° C., and 45% in the weft direction.
A knitted fabric (Example 2) treated exactly the same except for shrinkage, and a knitted fabric (Example 3) subjected to a water absorbing process were produced.

On the other hand, a flat knitted fabric using a single yarn of count 42 made of cotton, 90 warps / inch, 81 wefts / inch
(Comparative Example 1) was prepared, and these were evaluated. That is, after the ink was dropped on the knitted fabric, the time until the swelling due to surface tension disappeared due to the water absorption of the ink was measured (dropping method). Table 1 shows the results.

[0038]

[Table 1]

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 suction length of the ink by capillary action was measured (Bilec method). Table 2 shows the results.

[0040]

[Table 2]

Further, each knit was laminated on top of wool felt to form a stamp stand, impregnated with an oily dye, and stamped with rubber letters. Table 3 shows the results.

[0042]

[Table 3]

[0043]

According to the present stamp stand, there is almost no unevenness of ink at the time of printing, and the discharge of ink can be controlled to an appropriate amount, so that a clear imprint can be obtained.

In addition, the present stamp base is also used for a long period of time, because the clogging of the seal is reduced because the fuzz from the felt inside the stamp base is also suppressed, and the durability of the board cloth itself is high. Is possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fibrillated conjugate fiber that can be used for the face cloth of the present invention.

FIG. 2 is a cross-sectional view of a fibrillated conjugate fiber that can be used for the face cloth of the present invention.

FIG. 3 is a cross-sectional view of a fibrillated conjugate fiber that can be used for the face cloth of the present invention.

FIG. 4 is a cross-sectional view of a fibrillated conjugate fiber that can be used in the face cloth of the present invention.

FIG. 5 is a cross-sectional view of a fibrillated conjugate fiber that can be used for the face cloth of the present invention.

FIG. 6 is an explanatory view showing the structure of a stamp base.

Claims (1)

(57) [Claims] A polyamide component having a radial shape and
From a polyester component having a shape that complements the radiating section
Fibrils using benzyl alcohol
Stamp pad which fineness comprising brought reduction is a woven or knitted fabric using synthetic fiber filament of less than 1 denier was used as a board cloth.