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Suction device used in paper machine and paper machine using suction device

A suction device, a technology for paper machines, applied in the field of paper machines

Active Publication Date: 2019-11-08
VALMET AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors of the present invention have noticed that in paper machines using suction devices, such as molding boxes, there may be disturbance (disturbance) in the area downstream of the suction device, and this may sometimes be caused by the suction device self-induced

Method used

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  • Suction device used in paper machine and paper machine using suction device
  • Suction device used in paper machine and paper machine using suction device
  • Suction device used in paper machine and paper machine using suction device

Examples

Experimental program
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Effect test

Embodiment Construction

[0025] refer to figure 1 , shows the paper machine 1 . figure 1 The paper machine 1 is a machine for producing tissue paper webs with high bulk, such as TAD paper. The machine can be used to make tissue paper with 2 up to 40g / m 2 range of basis weights and can include, for example, toilet paper or kitchen paper grades. figure 1 The paper machine comprises a forming section 2 with a first forming fabric 3 and a second forming fabric 4 . The forming fabrics 3, 4 may be, for example, air and water permeable foraminous forming wires. Each forming fabric 3 , 4 is arranged to run in a loop supported by guide rolls 7 . During operation, the forming fabric 3, 4 will travel in the direction indicated by the arrow S. The headbox 5 is arranged to inject stock into the gap between the forming fabrics 3, 4, as is known in the art to which the invention pertains. Reference numeral 34 denotes a forming roll. The forming section is followed by a drying section 8 comprising a through-a...

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Abstract

The invention relates to a suction device (15) for use in a paper machine, suitable for acting on a wet fibrous web by means of a permeable fabric (4, 6), for example by means of an air drying (TAD) fabric . The suction device has a fabric-facing surface (18) formed by end faces of solid elements (21, 22). Channels (24, 25) are defined between the solid elements. The end face of the last solid element (22) is not in the same plane as the end face of the preceding solid element (21). Thereby, a gap A is formed between the fabric (4, 6) and the last solid element (22). This allows air to flow through the gap and into the final channel (25). The air flow will then capture fine debris, small fibers and water droplets and draw them into the final channel (25), thereby eliminating the accumulation of large amounts of fine debris and fibers.

Description

technical field [0001] The invention relates to a suction device for use in a paper machine. The suction device can be, for example, a molded box for a ventilated dryer. The invention also relates to a paper machine using the suction device of the invention. Background technique [0002] In paper machines various suction devices are used which act on the fibrous web through air and water permeable fabrics. One use of such a suction device is as a molding box in a ventilated dryer (ie a TAD machine). In a TAD machine, the wet fibrous web is dried as it is carried over one or more TAD cylinders on a permeable fabric with an embossed pattern. To imprint a three-dimensional pattern into the fabricated fibrous web, the web and permeable fabric may be passed through a molding box before the web is carried by the permeable fabric to one or more TAD cylinders. The molding box is a suction device which attracts the fibrous web towards the permeable fabric when the fibrous web and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F1/52D21F5/18D21F9/00
CPCD21F11/14D21F1/523D21F11/006D21F1/52D21F11/145D21F5/18
Inventor M·比耶克丹尼斯·朱伊特M·约翰森
Owner VALMET AB
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