A paper making machine for making tissue paper and a method of operating a paper making machine

A technology of paper machine and thin paper, applied in the field of paper machine

Active Publication Date: 2014-06-25
VALMET OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above mentioned patents include a large number of parts and it is desirable to reduce the number of parts used in a paper machine

Method used

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  • A paper making machine for making tissue paper and a method of operating a paper making machine
  • A paper making machine for making tissue paper and a method of operating a paper making machine
  • A paper making machine for making tissue paper and a method of operating a paper making machine

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Embodiment Construction

[0038] refer to figure 1, the invention relates to a paper machine 1 for the manufacture of paper, especially tissue paper. As used herein, the term "thin paper" refers to paper having a relatively low basis weight. In most cases this means a basis weight of 10g / m 2 up to 50g / m 2 Examples of tissue paper webs in which the basis weight may lie outside this range are known. Unlike cardboard, tissue paper does not have to be rigid, and thus tissue paper can have a lower basis weight. In most cases, the basis weight of thin paper can be in the range of 15g / m 2 up to 40g / m 2 range, and typical values ​​can be in the range of 15g / m 2 up to 30g / m 2 or 20g / m 2 up to 30g / m 2 In the range. Such paper can be used, for example, as facial tissue, toilet tissue or absorbent tissue (eg dish towels). The machine according to the invention comprises a former 2 in which a fibrous web can be formed. like figure 1 As can be seen in , the former 2 has a forming roll 4 , a forming fabr...

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Abstract

The invention relates to a paper making machine for making tissue paper. The machine comprises a former (2) and a press (11) with a first press member (12) and a second press member (13) arranged to form a dewatering nip (PN) with the first press member (12). A felt (7) is arranged to pass through the dewatering nip (PN). A drying cylinder (14) is arranged to form a transfer nip (TN) with the first press member (12) and a belt (15) forming a loop around the first press member (12) such that the belt (15) passes through the dewatering nip (PN) and the transfer nip (TN). The first press member (12) is an extended nip roll that has a flexible jacket (17) that forms a loop and a flexible support body (18) within the loop of the flexible jacket (17). The flexible support body (18) can be caused to press the flexible jacket (17) radially outwards and the flexible support body (18) is placed opposite the drying cylinder (14) such that the flexible support body (18) can press the flexible jacket (17) towards the drying cylinder (14) to close the transfer nip (TN). The paper machine also comprises a mechanical stop arranged to halt a closing movement of the first press member (12). The invention also relates to a method of operating the machine.

Description

technical field [0001] The invention relates to a paper machine for making tissue paper. The invention also relates to a method of operating such a machine. Background technique [0002] A paper machine for the production of tissue paper is known from US Patent No. 5,393,384. The paper machine shown therein has a watertight belt running in a loop through a wide press nip formed by shoe presses and opposing rolls. The press felt is conveyed through the press nip. In one embodiment, the shoe press is positioned such that it can act on the tissue drying drum. The drying effect of a shoe press is known to produce a significantly higher degree of drying than the corresponding roll press, and in combination with a water-absorbent belt that avoids rewetting of the paper web, this results in a significantly increased drying capacity of the press unit . [0003] Another paper machine for soft paper such as tissue paper is disclosed in US Patent No. 6,547,924. The paper machine ...

Claims

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Application Information

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IPC IPC(8): D21F11/14D21F3/02D21F3/04D21F9/02
CPCD21F3/045D21F3/0218D21F11/14D21F3/0281D21F11/006
Inventor 托尔德·古斯塔夫松拉斯·古斯塔夫森
Owner VALMET OY
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