Press felt for papermaking

A technology for pressing felt and batt, applied in papermaking, papermaking, textiles and papermaking, etc., can solve problems such as compression fatigue, achieve smoothness, reduce replacement times, squeeze water, and have good resistance to hair loss and abrasion.

Inactive Publication Date: 2010-02-03
ICHIKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the press felts of JP-A-2004-143627 and JP-A-8-302584 have the problem that they are susceptible to repeated compression fatigue caused by the press device.

Method used

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  • Press felt for papermaking
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  • Press felt for papermaking

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no. 1 approach

[0057] In addition, as the first embodiment of the present invention, the fibers contained in the base side batt layer 22 use so-called core-sheath composite fibers in which the sheath is melted by heat treatment but the core is not. However, the core-sheath composite fibers may be replaced with Fully fused fibers are used, or both core-sheath composite fibers and fully fused fibers may be used together.

[0058] Here, the so-called full-melt fiber refers to a fiber in which all components are made of low-melting-point materials and are completely melted at a relatively low temperature. When fibers containing fully melted fibers are included in the base side batt, compared to when the above-mentioned core-sheath composite fibers are included, the action of hot pressing during the production of felts is slightly eased, since only the side of the fully melted fibers can be melted, so It is possible to thermally bond napped fiber bundles of fully fused fibers in a columnar shape....

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Abstract

The press felt (10) for papermaking comprises base (30) and a butt layer furnished with wet-paper-side layer (20). The wet-paper-side layer (20) has base-side butt layer (22), and pile-erected fiber bundle (50) is provided within the base-side butt layer (22). The pile-erected fiber bundle (50) is provided by needle punching of sheath-core conjugate fiber (41) followed by thermal treatment meltingportion of the sheath component of the sheath-core conjugate fiber (41) so that fibers are fusion bonded in columnar form. Accordingly, the base-side butt layer (22) is densified so as to suppress the movement of the moisture of press-side butt layer (23) to the wet paper side, thereby inhibiting any rewetting phenomenon. Further, by virtue of the pile-erected fiber bundle (50) fusion bonded in columnar form, felt (10) has enhanced abrasion resistance and compression fatigue resistance.

Description

technical field [0001] The present invention relates to a papermaking press felt (hereinafter, simply referred to as "press felt") used in a papermaking machine. Background technique [0002] Conventionally, in the papermaking process, a press device has been used to squeeze water from wet paper. In the press device, the wet paper after forming the paper layer is squeezed through a press nip through a press felt. Furthermore, press installations usually consist of a plurality of press nips. [0003] Figure 4 It is a brief diagram of the press nip of the press unit. [0004] The press nip is composed of a pair of press rolls P', P' and a pair of press felts 11', 11' clamping the wet paper W'. 11', 11' and the wet paper W' apply pressure, so that the moisture is squeezed out from the wet paper W' and absorbed by the press felts 11', 11'. [0005] However, since the pressure applied to the wet paper W' and the press felts 11', 11' drops sharply from the center (nip part) o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F7/08
CPCD21F7/083Y10T442/3732Y10T442/3764
Inventor 大内隆司
Owner ICHIKAWA ELECTRIC CO LTD
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