Press felt for papermaking

Abstract

The invention is to provide a jointless and joint-containing felt in which warp yarn and weft yarn of base cloth forming the felt are monofilament in order to guarantee proper space and volume and continuance of permeability and compressibility of the felt, and thus to provide the felt on the occasions of solving unhairing problem of a wet paper side and roller side, increasing no operation processes and causing no great change of physical property of the felt. In the press felt (500) for papermaking, the base fabric (510) has a multilayered structure forming the wet paper side (511) and roller side (512); the ground warp yarn (521 and 522) and the group weft yarn (531) are the monofilament; joining fiber layers (551 and 552) are integrated with the base cloth; and an additional warp yarn (541) formed by yarn material different from the material of the ground warp yarn is disposed between the ground warp yarn and is woven in a manner that the additional warp yarn floats and sinks on the two surfaces of the wet paper side and the roller side.

Description

technical field [0001] The present invention relates to a press felt for papermaking (also referred to as a press fabric, hereinafter simply referred to as a felt) used in a papermaking machine. Background technique [0002] In the papermaking process, in order to press and dehydrate the wet paper, a conventional papermaking machine generally has a wire part, a press part, and a drying part. These papermaking wire parts, press parts, and drying members are arranged in this order along the conveyance direction of the wet paper. The wet paper is conveyed one by one with transitions and dewatered by the papermaking tools respectively arranged in the papermaking wire part, the pressing part and the drying part, and is finally dried in the drying part. [0003] A papermaking tool corresponding to the dehydration function is used in each of these parts. The pressing device arranged in the pressing section includes a plurality of pressing devices arranged in series along the conv...

AI Technical Summary

Problems solved by technology

[0010] The warp yarns constituting the base fabric of this seamed felt use monofilament yarns in order to ensure an appropriate space volume in the felt as described above, and to maintain water permeability and compressibility. In the case of shape retention, meshing of coils, insertion of core wires, etc., it is necessary to use monofilament

[0011] However, if monofilament yarns are used for the warp and weft yarns constituting the base fabric of the felt, then when the bonding fibers are entangled and integrated with the base fabric felt by the needle punching method, the monofilament yarns constituting the base fabric and the bonding fibers are weakly entangled. As a result, the bonding fibers will fall off during the use of the blanket, and the so-called depilation phenomenon occurs

[0012] This depilation phenomenon will cause the following problems: Disruption of wet paper conveyance, causing the shedding of bonding fibers to adhere to wet paper and causing paper printing problems, in addition, due to the shedding of bonding fibers, many physical problems such as press dehydration and water permeability of the felt will be affected. Changes in properties disturb the operational stability of papermaking, and expose the warp and weft yarns on the wet paper side of the base fabric or on the roll side, which accelerates the wear of the base fabric, resulting in a decrease in the strength of the base fabric and shortening the life of the felt

[0022] However, in the felt described in Patent Document 3, when the additional warp yarns are arranged only on the paper-making surface side, there may be a problem of depilation on the driving surface side, and when the additional warp yarns are arranged only on the driving surface side, there may be a problem of hair loss. Hair loss on the paper side

[0023] In addition, in the case of the seamed felt disclosed in Japanese Unexamined Patent Publication No. 2010-100947 (Patent Document 3), in which additional warp yarns are arranged on both the paper-making surface side and the running surface side, when the core thread is replaced (for example, by Needle punching method to make the bonding fiber and the base fabric entangled and integrated (replacing the damaged core thread due to needle punching) and / or the operation of dividing the felt at the seam (such as cutting the reverse bonding fiber layer of the seam, removing During the so-called dividing process of joining fibers entangled with seam loops and cutting the joint fiber layer on the surface of the seam), additional warp yarns are connected above and below the seam section, so the seam loops cannot be seen due to the additional warp yarns , the seams cannot be opened, so the number of operating procedures increases a lot

In addition, when cutting the additional warp, even the seam loop may be cut

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