JPS6332158Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to improvements in the joints of needle canvases used in the drying process of paper manufacturing. Normally, an end-shaped needle canvas is hung in a multi-tube dryer, and joints are created at both ends to make it endless. It is preferable that this joining part, the so-called joint, be the same as the main body part, but it is inevitable that there will be some difference in structure, and problems in terms of strength are likely to occur. The present invention is an improvement to improve this strength and durability, and to solve problems such as the joint part leaving marks on the paper.

An example of a conventional needle canvas joint is the first
As shown in the figure, a butt 2 (a soft aggregate of fibers, also called a web) is needled on the upper surface of the base fabric 1, and then a predetermined portion is cut, and each terminal part of the batt 2 is cut into the base fabric 1.
Both ends 1a, 1b of the base fabric are peeled off by hand for the required length from the batt 2, and both ends 1a, 1 of the peeled base fabric are
The fabric 7 is sewn onto b using a sewing machine, a joining metal fitting (hook) is attached to the tip thereof, and the butt of the peeled part and the base fabric, and the butt and the upper surface of the metal fitting leg are glued with adhesive 9.
The metal fittings are meshed oppositely and the core wire 6 is inserted through the common hole to connect them endlessly.

The base fabric is woven with single or twisted synthetic fibers such as monofilament, multifilament, spun yarn, etc. in a single layer or in multiple layers as warp and weft yarns. Also, the butt is made of polyamide, polyester,
Synthetic fiber staples such as acrylic fibers are used alone or in combination.

Another method of connecting devices is to use a base fabric (with a loop at the tip) with a joint made on a small width loom instead of metal fittings.
Polymerize and sew between the base fabric of the canvas,
It may also be made into an endless shape by joining the loops at both ends and inserting the joined core wire in the same way as in the previous case. Or both ends 1 of the peeled base fabric as shown in Figure 2.
a, 1b are folded back and sewn to the main body part using sewing thread 8, and the spiral wires 4, 5 are attached to the warp threads at the folded bends, and then the peeled parts are glued with adhesive 9, and the spiral wires 4, 5 are attached. A method is used in which the core wire 6 is inserted into the common hole of the core wires, which are opposed to each other and meshed with each other. The adhesive used is an epoxy, polyurethane, or silicone resin, either directly or diluted with a solvent to an appropriate viscosity.

However, as the needle canvas is used, the joint portion weakens due to bending and heat effects, and the flap portion is damaged first. That is, this part becomes brittle and the fibers of the batt begin to peel or fall off. or,
The adhesive used to increase the strength penetrates into the vat more than necessary, making this part harder than the main body, and in some cases penetrating into the surface layer and hardening, requiring a delicate texture. Paper and high-quality papers have a mark defect.

The present invention solves these drawbacks.
That is, a highly durable thin cloth is sandwiched between the middle layer of the butt of the joint part and needled together with the butt.

To explain this in the design diagram of Fig. 3, a thin cloth 3 is inserted into the middle layer of the butt 2 at a length slightly longer than the full width of the joint, that is, a length of 50 m/m to 100 m/m over the entire width. . Normally, bats are stacked in two to five layers on one side and needled each time or after pre-punching an appropriate layer, so it is easy to sandwich a thin cloth between them.

The thin cloth used is one woven as thinly as possible (preferably 0.5 mm or less in thickness) using a heat-resistant synthetic fiber such as Nomex (trademark) or Cornex (trademark).

This prevents the joint flap from becoming brittle or peeling off earlier than other parts due to direct heat from the dryer cylinder. Also, when adhering with resin, the applied resin penetrates the surface layer of the bat (paper-contacting side) by capillary action, and there is a risk that the surface layer of the bat will harden and become a mark on the paper. As a result, the adhesive strength at the interface with the base fabric increases, and the surface fibers can maintain the same soft state as other parts, so that there is no adverse effect on the paper.

Also, if some flaps are machine sewn, this can be omitted.

The above structure has been found to be effective in improving the durability of needle canvas, which tends to cause problems at the joints, and preventing negative effects on paper sheets, but it is also extremely difficult to implement. This is an extremely significant idea because it has no gender implications.

[Brief explanation of the drawing]

FIGS. 1 and 2 show cross-sectional views of conventional needle canvas joints. FIG. 3 shows a cross-sectional view of the joint of the needle canvas of the present invention. 1...Base fabric, 2...Butt, 3...Thin fabric, 4,
5...Joining tool (metal fittings or spiral), 6...Joining core wire, 7...Fabric, 8...Machine sewing, 9...
Resin coating layer, 1a, 1b...Both ends of base fabric, S...
...Touching surface.

Claims (1)

[Scope of utility model registration request] Paper manufacturing in which the canvas body is formed by needle-punching butts on one or both sides of the base fabric, which is laminated and polymerized, and joining loops attached to both ends of the canvas body are engaged, and a core wire is inserted through the common hole to create an endless paper. A joint part of a needle canvas for paper making, characterized in that the needle canvas for paper making is needled with a heat-resistant thin cloth interposed in the middle layer of the butt on the paper-contacting surface side of the joint part.