JPH017760Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to reinforcing the ears of a paper dryer canvas. In order to dry the wet paper, the dryer canvas presses the wet paper against the heating cylinder while bending between many steam heating cylinders and guide rollers. Therefore, the canvas is constantly subjected to heating action during long periods of use, and the
Because it travels at a high speed of 1,000 meters, it is exposed to extremely harsh effects.

Recently, many dryer canvases are made of synthetic fibers, and the selvage of the canvas is cut to a specified width after the heat-setting process, and the edges are cut along the outermost warp of the selvage to prevent fraying. Usually, the warp and weft threads are welded using a heated trowel. After that, resin is coated over the entire length of the selvedge, 2 to 5 cm wide, to bond the warp and weft threads and prevent the warp threads from fraying.

As the resin, epoxy-based, acrylic-based, polyurethane-based, silicone-based, etc. resins are used. It is desirable that the resin has heat resistance, chemical resistance, flexibility, etc., and that its adhesive effect is not lost over a long period of time. Furthermore, the ears are often worn out due to contact with the detection arm that maintains the running properties of the canvas.

Due to its nature, synthetic monofilament yarns have weak adhesion to resins, especially when the yarns are thick. This seems to be due to the lack of anchoring effect during adhesion.

The resin applied to the monofilament yarn hardens under the influence of heat, making it more likely to crack and partially peel off.

The present invention is intended to solve these problems. That is, during weaving, a separate thread having good adhesion to resin is woven into the canvas selvage by an appropriate method along with the monofilament warp over a required width. After that, heat set as usual, and then apply resin processing to the ears.

As the other yarn, a synthetic fiber multifilament yarn or spun yarn is used. In addition, as for the method of combining with monofilament warp yarns, a method such as drawing, twisting, or covering is used to make a composite yarn of both.

By doing this, the resin enters into the constituent single fibers of the multifilament yarn or spun yarn and wraps around the monofilament warp yarns, providing a sufficient anchoring effect and making the mutual adhesion extremely strong. Even if the resin hardens after a number of days of use, the fine fibers inside the resin allow it to maintain its functionality for a long period of time without peeling or cracking.

Next, a description will be given with reference to the drawings.

FIG. 1 is a longitudinal sectional view of the ear portion of the dryer canvas of this invention, and FIG. 2 is a plan view. Weaving is carried out as a composite yarn in which multifilament yarn is aligned with monofilament yarn on warp 2 corresponding to half the number of warp yarns in the selvedge part. Further, the multifilament yarn can be combined with the monofilament warp by twisting it together using a twisting machine, or it can be made into a so-called covering form. It is also possible to use thin spun yarns instead of multifilament yarns. In either case, it is undesirable that the thickness of the selvedge increases, so it is preferable to use thin threads. The width of the selvedge is set in advance to be much wider than the width of the resin coating, and a composite yarn is used for the warp, since the width of the selvedge will shrink slightly during the heat-setting process, and will also serve as reinforcement for the selvedge. Although the figure shows two- and five-ply weaves, the same method as in the present invention can be applied to double-ply weaves and plain weaves.

Example: In a 2.5-ply weave canvas as shown in Figure 1, the warp is made of polyester monofilament with a diameter of 0.4 mm.
For each 10cm width of both ears, 1/2 of the number of warp threads is made of composite threads. For other threads (D200d/4+
A T250d/1) multifilament yarn with 9 S twists per 2.5 cm was aligned in the warp and woven as a composite yarn. After heat setting, it was cut into a predetermined width (7.2 m), the ends were welded, and polyurethane resin was applied over a 2 cm width, followed by drying. This canvas has been used in a high-speed paper drying section, and the edges have not frayed even after more than a year and a half, and the bond between the resin and warp threads is good, and the previous problems have been resolved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the ear part of the dryer canvas of the present invention, and FIG. 2 is a plan view of the canvas of the present invention. 1: Dryer canvas, 2: Warp, 3: Separate yarn, 4: Weft, 5: Composite yarn of selvage + resin coating area.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a dryer canvas for paper manufacturing using synthetic fiber monofilament yarn as the warp, a composite yarn of monofilament yarn and another yarn is used as the warp of the selvage, and this selvage A dryer canvas characterized in that a resin is applied to the canvas, and monofilament yarns of the warp of the selvage portion and other yarns are bonded by the resin. (2) The dryer canvas according to claim 1, wherein the composite yarn is a stretched yarn of a monofilament yarn and a separate yarn. (3) The dryer canvas according to claim 1, wherein the composite yarn is a twisted yarn of a monofilament yarn and a separate yarn. (4) The dryer canvas according to claim 1, wherein the composite yarn is a covering yarn in which another yarn is wound around a monofilament yarn. (5) The dryer canvas according to any one of claims 1 to 4, wherein the separate yarn is a spun yarn. (6) The dryer canvas according to any one of claims 1 to 4, wherein the separate yarn is a multifilament yarn made of synthetic fiber.