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Press sleeve and method of manufacturing the same

A polyol and cross-linking agent technology, applied in the field of press sleeves, can solve the problems of inability to achieve stability and service life

Active Publication Date: 2020-11-20
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, currently known polyurethanes from the prior art (in particular prepolymers based on 1,4-phenylene diisocyanate and 1,4-butanediol (PPDI-1,4-BDO) or 1,4 -Phenylene diisocyanate and 1,4-hydroquinone bis(2-hydroxyethyl)ether (PPDI-1,4-HQEE) respectively crosslinked with aromatic polyamines) have until today not been possible in the corresponding application cases Achieve stability and longevity that satisfy customers

Method used

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  • Press sleeve and method of manufacturing the same
  • Press sleeve and method of manufacturing the same
  • Press sleeve and method of manufacturing the same

Examples

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Embodiment Construction

[0046] The back roll 14 here consists of a cylindrically designed roll rotating about its longitudinal axis, while the shoe press roll 12 consists of a shoe 16 , a stationary yoke 18 supporting the shoe 16 and a press sleeve 20 . The shoe 16 and the yoke 18 are fixedly arranged relative to the back roll 14 or the press jacket 20, respectively. This means they do not rotate. In this case, the shoe 16 is supported by a yoke 18 and is pressed by means of hydraulic press elements, not shown, onto a press sleeve 20 surrounding it. The press sleeve 20 , which surrounds the shoe 16 and the yoke 18 in the circumferential direction, rotates here about its longitudinal axis counter to the direction of rotation of the counterroll 14 . Due to the concave configuration of the shoe 16 on its side facing the back roller 14 , a relatively long nip 22 results.

[0047] The shoe press 10 is particularly suitable for dewatering the fibrous web 24 . During operation of the shoe press, the fibr...

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Abstract

The invention relates to a press sleeve comprising at least one polymer layer, wherein the polymer layer comprises or is made of polyurethane, wherein the polyurethane is formed from a prepolymer and a crosslinking agent, the prepolymer being 1, The reaction product of 4-phenylene diisocyanate and polyol, wherein said cross-linking agent comprises the following components: including 1,4-butanediol or 1,4-hydroquinone bis(2-hydroxyethyl) ether ( HQEE), a first component comprising at least one aliphatic diamine, a third component comprising at least one alkanolamine.

Description

technical field [0001] The invention relates to a press jacket (press jacket), in particular a press jacket (press jacket) for processing a fibrous web, for example for its leveling (smoothing) or dewatering (pressing device), and for the manufacture of A corresponding method for such a press sleeve. Background technique [0002] Pressing devices such as shoe presses have long been part of modern paper machines. They essentially consist of a fixed arrangement of shoes extending transversely of the machine and a press sleeve surrounding the fixed shoe. The latter is deformable and assumes a substantially tubular shape during operation. The shoe is shaped in such a way that it forms a press nip (or press nip) (press nip) with a backing roll (counter roll Gegenwalze). The press nip is defined in the shoe by the contact surface of the backing roll. The boot is designed to be movable and can be moved to the back roller. [0003] With regard to their stability, ie in terms of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F3/00D21F3/02C09D175/00
CPCC08G18/7614C08G18/10C08G18/227C08G18/3228C08G18/3271C08G18/3206C08G18/3215D21F3/0227D21F3/0236
Inventor D.德尔马斯H.赖克特U.马图施齐克M.沃库雷克
Owner VOITH PATENT GMBH
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