Shoe press belt for paper making

A shoe-shaped pressing and fiber-reinforcing technology, which is applied in the direction of papermaking, paper machines, and pressing parts, can solve problems such as the harsh environment in which the shoe-shaped press belt is used, and achieve enhanced bending resistance, improved wear resistance, and improved durability Effect

Active Publication Date: 2012-01-25
ICHIKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0034] However, in recent years, the use environment of the shoe press belt has become increasingly severe due to the increase in operating speed due to the improvement of paper productivity, the expansion of the width of the shoe press belt to about 10m, and the increase in the pressure of the press section.

Method used

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  • Shoe press belt for paper making
  • Shoe press belt for paper making
  • Shoe press belt for paper making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0132] Next, in order to evaluate the physical properties of the polyurethane forming the shoe press belt 10, a case where a polyurethane test piece is produced will be described.

reference example 1

[0134] A urethane prepolymer is obtained by reacting p-phenylene diisocyanate (PPDI) with polytetramethylene glycol (PTMG). Composition (H / NCO The ratio is 0.95) into the preheated mold, heated to 127°C, and pre-cured at 127°C for 0.5 hours.

[0135] Then, the pre-cured composition was taken out from the mold, and post-cured at 127° C. for 16 hours. Thus, a cured polyurethane sheet having a "JIS A hardness" of 98.1 degrees was obtained. A test piece (thickness: 1.5 mm) was produced from this piece.

reference example 2

[0137] A urethane prepolymer is obtained by reacting p-phenylene diisocyanate (PPDI) with polytetramethylene glycol (PTMG). A composition (H / NCO ratio is 0.95) into a preheated mold, heated to 127°C, and pre-cured at 127°C for 0.5 hours. Then, the pre-cured composition was post-cured at 127° C. for 16 hours.

[0138] Thus, a cured polyurethane sheet having a "JIS A hardness" of 98.1 degrees was obtained. A test piece was produced using this piece.

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Abstract

Disclosed is a shoe press belt (10) which comprises a reinforcing fibrous base material (6) embedded in a polyurethane layer, and has an outer circumference layer (2a, 21) and an inner circumference layer (2b, 22) each formed with a polyurethane. The polyurethane layer comprises a polyurethane which is produced by curing a composition comprising a mixture of an urethane prepolymer (A) and a curing agent (B). The urethane prepolymer (A) is produced by reacting an isocyanate compound (a) containing 55 to 100 mol% of a p-phenylene-diisocyanate compound with polytetramethylene glycol (b) and has an isocyanate group at its terminal. The curing agent (B) is selected from the group consisting of 1,4-butanediol, hydroquinone bis-sshydroxyethyl ether, 3,5-diethyltoluenediamine and 3,5-dimethylthiotoluenediamine. The belt (10) has excellent cracking resistance, bending fatigue resistance and wear resistance.

Description

technical field [0001] The present invention relates to a shoe press belt for papermaking (belt for a shoe press) used in a shoe press apparatus for papermaking, and particularly relates to a shoe press belt used for a closed shoe press. [0002] More specifically, the belt has a resin layer made of polyurethane having a specific composition and hardness, and is a papermaking shoe press belt excellent in mechanical properties such as crack resistance, bending fatigue resistance, and abrasion resistance. Background technique [0003] Figure 4 is a cross-sectional view of a shoe press belt for papermaking, Figure 5 It is a cross-sectional view of a shoe press for papermaking. [0004] Such as Figure 5 As shown, in the shoe press for papermaking, a shoe press mechanism in which an endless shoe press belt 10 is interposed between a press roll 1 and a shoe 5 is used. In this mechanism, a transfer felt 3 and a wet paper 4 are passed through a press section formed by a press ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F3/02
CPCC08G18/4854D21F3/0227C08G18/7614C08G18/10C08G18/3206C08G18/3865C08G18/3215B32B27/40
Inventor 矢崎高雄铃木伸治山崎新太郎石野淳
Owner ICHIKAWA ELECTRIC CO LTD
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