JPH066496U - Needle canvas - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a needle canvas that does not impair the characteristics of the material and has an antistatic effect. [Structure] In a needle canvas made by needle-punching a fibrous web on a base cloth, the fibrous material of the fibrous web is mixed with metal-coated fibers that are of the same quality as the fibrous material inside and have a metallic coating on the outside. Needle canvas that is characterized by being. [Effect] The needle canvas has an antistatic effect because the metal-coated fiber is conductive because the metal-coated fiber is mixed in the fiber web, and the inside of the metal-coated fiber has the same quality as the fiber web. As it is a material, it does not impair the characteristics of the material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dryer canvas used in a paper machine, and more particularly to a dryer needle canvas formed by needle punching a fiber web on a canvas base fabric.

[0002]

[Prior art]

 In the dryer part of the paper machine, as the paper dries, static electricity is generated due to friction between the synthetic resin canvas and the paper, or the synthetic resin canvas and the rolls, and becomes charged. Since this electrostatic charge poses a risk of disasters and failures such as explosion, ignition, suction, and repulsion, various antistatic measures have been taken for synthetic resin canvas (hereinafter called canvas).

As a means for preventing static electricity in a conventional canvas, a method in which a conductive monofilament is arranged on a part of the warp is disclosed in Japanese Utility Model Publication No. 02-57998 and Japanese Utility Model Publication No. 02-57998. As a means for preventing static electricity in the needle canvas, there is a non-woven fabric in which metal fibers are mixed and needle punched as described in Japanese Utility Model Publication No. 62-199893.

[0004]

[Problems to be solved by the device]

 However, in order to create a needle canvas with an antistatic effect, when a conductive monofilament is arranged on a part of the base cloth as the base cloth and the fiber web is needle punched on the base cloth, the antistatic effect is obtained by the fiber web. As a result, the antistatic ability becomes lower than the conventional product.

Therefore, a needle canvas in which metal fibers are mixed in the fiber web has been used. However, since the metal fibers have completely different properties such as flexibility and hardness from the fiber material of this fiber web. In a carding machine, when the fibers are separated, they are not separated properly and become lumps, which makes it difficult to mix them uniformly with other fiber webs, and because of their hardness, they may damage wires and other parts. In addition, if these metal fiber lumps are exposed on the surface by needle punching, the surface area of that part is different from that of the original fiber web and the air permeability is different. If the needle canvas is used in a paper machine, unevenness will occur on the paper surface due to the difference between the two. The present invention is provided for the purpose of solving such inconvenience.

[0006]

[Means for Solving the Problems]

 The present invention solves such a problem by mixing fibers having the same quality as the fiber material and having a metal coating in the fiber material forming the fiber web of the needle canvas.

That is, in a needle canvas made by needle-punching a fibrous web on a base fabric, a fiber obtained by subjecting the fibrous material of the fibrous web to a fiber material of the same quality as the fibrous material (hereinafter referred to as metal coating). It is a needle canvas characterized by being mixed with (fiber). The term "coating" as used herein includes all coatings formed by plating, vapor deposition, coating, etc.

The mixing ratio of the metal coating fiber is preferably 1% to 30% by weight with respect to the fibrous web, and if it is 1% by weight or less, the antistatic effect is almost negligible because it diffuses too much.

In order to increase the antistatic effect, it is sufficient to increase the mixing ratio of the metal-coated fiber, but since the cost also increases accordingly, considering the antistatic effect and various costs, it is preferably 1%. ˜20%, more preferably 1% to 10%.

The metal-coated fiber is preferably a fiber obtained by applying a metal coating to a fiber material of the same quality as the fiber material forming the fiber web, and more preferably the same fiber material having a metal coating. It is a fiber.

In this metal-coated fiber, if the amount of metal coating on the fiber material is too thick, only the characteristics of the coating metal will be exerted and the characteristics of the internal fiber material will be lost. The metal coating amount is preferably 0.01 to 0.5 micron with respect to the fiber in order to utilize the characteristics as well.

[0012]

[Action]

 By mixing the metal-coated fiber in the nonwoven fabric of the needle canvas, the needle-canvas diffuses or discharges the generated charge and prevents electrification because the metal-coated fiber is conductive.

Further, since the inside of the metal-coated fiber is the same fiber material as the fiber web, the characteristics of the material are not impaired, and the needle canvas has physical properties such as surface hardness as compared with the case where the metal coating fiber is not mixed. Will be equivalent.

[0014]

【Example】

 The present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional structure diagram showing the weaving structure of the first, third and fifth embodiments of the present invention, and FIG. 2 is the second and fourth embodiments of the present invention. It is a cross-section organization chart which shows the weaving organization of Example 6.

Example 1 This is a needle canvas in which a fiber web material is a mixture of nylon fiber and acrylic fiber, and nylon fiber is further mixed with nickel coated fiber to form a fiber web. A needle canvas was prepared by needle punching the fibrous web on a base fabric. Table 1 shows the specifications of the base cloth and fiber web.

[0016]

[Table 1]

[Example 2]; A base fabric having a different specification from that of Example 1 is used, and a fibrous web is made of the same material as that of Example 1 but partially different in denier and web formulation. It is a canvas. Table 2 shows the specifications of the base cloth and the fibrous web.

[0018]

[Table 2]

[Embodiment 3] This is a needle canvas having the same base cloth specifications as in Embodiment 1, and a nylon web and an acrylic fiber are coated with nickel on an acrylic fiber mixed with a fiber web material. A fiber web is prepared by mixing the treated fibers, and the fiber web is needle punched on a base fabric to form a needle canvas. Table 3 shows the specifications of the base fabric and the fibrous web.

[0020]

[Table 3]

[Example 4] The same specifications as in Example 2 were used for the base fabric, and the fiber web was the same material as in Example 3 except for some denier and different web blending specifications. It is what The specifications of the base cloth and the fibrous web are shown in Table 4.

[0022]

[Table 4]

[Embodiment 5] This is a needle canvas with the same base fabric specifications as in Embodiment 1, and a nylon web and a chrome coating on the nylon fiber and a mixture of nylon fiber and acrylic fiber as the fiber web material. The fiber web is prepared by mixing the treated fibers, and the fiber web is needle-punched into a needle canvas. Table 5 shows the specifications of the base cloth and the fibrous web.

[0024]

[Table 5]

[Example 6]: The same specifications as in Example 2 were used for the base fabric, and the fiber web was the same material as in Example 5 except for some denier and different web blending specifications. It is what The specifications of the base cloth and the fibrous web are shown in Table 6.

[0026]

[Table 6]

[Embodiment 7] This is a needle canvas having the same base fabric specifications as in Embodiment 1, and a nylon web and an acrylic fiber are mixed-spun as the fibrous web material, and the acrylic fiber is further coated with chromium. The fiber web is prepared by mixing the treated fibers, and the fiber web is needle-punched into a needle canvas. Table 7 shows the specifications of the base fabric and the fibrous web.

[0028]

[Table 7]

[Example 8] The same specifications as in Example 2 were used for the base fabric, and the fiber web was the same material as in Example 7 except for some denier and different web blending specifications. It is what The specifications of the base cloth and the fibrous web are shown in Table 8.

[0030]

[Table 8]

In order to compare the effect of preventing charging voltage, a needle canvas of Example 1 and a dryer canvas (comparative example 1) in which a conductive monofilament is arranged in a part of a conventional base cloth and comparative example 1 were used as canvas base cloths. Each of the needle canvases (Comparative Example 2) in which the non-woven fabrics of the non-woven fabric of Example 1 were laid one on top of another were subjected to a running test machine, and the canvas was run at a constant speed to reach 30 mm from the canvas. The test was performed using a collector type electric potential measuring device (KS-525 manufactured by Kasuga Denki) at measurement positions separated from each other. The setting conditions and the results at that time are as shown in Table 9.

[0032]

[Table 9]

This result shows that when a non-woven fabric containing no metal coating fiber is overlaid on a dryer canvas (Comparative Example 1) which originally has an antistatic effect (Comparative Example 2), the antistatic effect is reduced and the antistatic effect is originally obtained. By laying a non-woven fabric mixed with metal-coated fibers on a non-canvas base fabric (Example 1), it is shown that this needle canvas has a voltage-preventing effect.

[0034]

[Effect of device]

 By mixing the metal-coated fibers in the fiber web in the needle canvas, the needle-canvas has an antistatic effect because the metal-coated fibers are electrically conductive.

Further, since the metal-coated fiber is a fiber material of the same quality as the fiber web, it has an effect of not impairing the characteristics of the material, and also in terms of surface properties, the physical properties such as the surface hardness of the needle canvas are the metal coating. It is equivalent to the case where fibers are not mixed.

Further, even in resin processing, since the surface properties are the same, there is no need to change the processing method, and there is an effect that the same finishing as in the case where the metal coating fiber is not mixed is completed.

[Brief description of drawings]

FIG. 1 is a cross-sectional structure diagram showing the woven structures of Example 1, Example 3, and Example 5.

FIG. 2 is a sectional structure diagram showing the weaving structures of Examples 2, 4, and 6;

[Explanation of symbols]

1: Fiber web, 2: Fiber material, 3: Metal coated fiber, 4: Warp yarn, 5: Front weft yarn, 6: Middle weft yarn, 7:
Back weft.

Claims (1)

[Scope of utility model registration request] 1. A needle canvas made by needle-punching a fibrous web on a base fabric, wherein the fibrous material of the fibrous web is mixed with fibers of the same fibrous material and metal-coated. Characteristic needle canvas.