Press belt and shoe press roll

Abstract

A press belt 2 comprises both end corresponding regions B positioned so as to correspond to both ends of a press roll 1 or a pressing shoe 3 in the width direction and a center region A positioned between the both end corresponding regions B. The center region A has a predetermined thickness and constitutes a pressed part pressed by pressing means. The end corresponding regions B have a thickness smaller than that of the center region A to form recessed parts and constitute pressure escape parts for allowing the pressure from the pressing means to escape.

Description

TECHNICAL FIELD[0001]The present invention relates to a press belt and a shoe press roll used for pressing a press object in various kinds of industries such as a papermaking industry, a magnetic recording medium manufacturing industry and a fiber industry.BACKGROUND ART[0002]In the various kinds of industries, a belt press is used such that a band-shaped press object is put on a press belt and the press object is pressed between one pressing member positioned inside the periphery of the press belt and the other pressing member positioned outside the periphery of the press belt. Here, the pressing member includes a press roll and a pressing shoe. As one example of the belt press, there is a shoe press as a dewatering press in the papermaking industry.[0003]To explain the shoe press briefly taking the papermaking industry as one example, it is a method for pressing (dewatering) a press object (wet paper web) by applying a surface pressure to the press object put on the outer peripher...

AI Technical Summary

Benefits of technology

The present invention provides a press belt that can prevent cracks from being generated at both ends when a press object is pressed. The press belt has end corresponding regions positioned so as to correspond to the ends of the pressing means and a center region positioned between the end corresponding regions. The center region has a predetermined thickness and constitutes a pressed part, while the end corresponding regions have a smaller thickness and form recessed parts allowing the pressure from the pressing means to escape. This design prevents bending stress from being applied to the end corresponding regions, reducing the likelihood of a crack being generated. The press belt can be used in a shoe press roll and provides effective prevention of cracks.

Problems solved by technology

However, since harsh bending and pressing are repeated to the press belt, the shoe press belt especially, the fact that a crack is likely to be generated in its outer peripheral surface is a serious problem in view of durability.

A crack is likely to be caused intensively at both edge regions corresponding to both ends of the pressing means such as the press roll and the pressing shoe in the width direction.

Thus, according to the belt in which the change in hardness is increased between the center region and both edge regions in the width direction, its cylindricity deteriorates and its traveling performance could be damaged.

However, even when the flexibility at the both end corresponding regions of the press belt is improved, the crack is not satisfactorily prevented from being caused.

That is, the pressure from the pressing means and bending force generated by the pressing process inevitably are applied synergistically to the above boundary part.

Therefore, even when the region in the vicinity of the boundary part has the flexibility, a crack is not satisfactorily prevented from being generated.

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