Twin wire gap former paper making machine with variable wrap impringement shoe

A paper machine and forming shoe technology, applied in the field of scraper-type double-fabric forming section, can solve the problems of bulkiness, difficult slurry jet guidance, inaccurate and cumbersome fine-tuning control of weir lips, etc., and achieve the effect of keeping the track unchanged

Active Publication Date: 2013-06-12
ASTENJOHNSON INC (US)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Headboxes are cumbersome pieces of equipment, and despite the provision of so-called weir lips, which can be used to direct the flow of stock discharged from the headbox to predetermined positions on the impact shoe, the fine-tuning control of these weir lips is still imprecise and cumbersome
It is actually very difficult to precisely direct the slurry jet onto the impact shoe so that it impacts exactly where it is

Method used

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  • Twin wire gap former paper making machine with variable wrap impringement shoe
  • Twin wire gap former paper making machine with variable wrap impringement shoe
  • Twin wire gap former paper making machine with variable wrap impringement shoe

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Embodiment Construction

[0039] Certain terminology is used below for convenience only and should not be considered limiting. The words "lower", "upper", "left" and "right" indicate directions in the drawings to which reference is made. The terms "a" and "one" are defined to include one or more of the referenced parts unless expressly stated otherwise. The term "effective wrap angle" refers to the wrap angle from the point of impact of the jet to the trailing edge of the impact shoe. The term "fabric offset angle" refers to the angle formed by the forming fabric at the impact shoe trailing edge and / or the forming shoe leading edge.

[0040] see now figure 1 , which shows the forming section 10 of a doctor blade forming paper machine. The forming section 10 includes a headbox 12 which delivers a stream of papermaking slurry 14 to a point of impact 16 on a conveying forming fabric 18 . A support forming fabric 20 is also provided which joins the delivery forming fabric 18 at or very close to the poi...

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Abstract

A forming section for a gap blade former type papermaking machine having a headbox which delivers a jet of papermaking stock between a conveying forming fabric and a backing forming fabric is provided. The conveying fabric moves in sliding contact over an impingement shoe on which the jet of papermaking stock is delivered at a point of impingement. A forming shoe located immediately downstream of the impingement shoe over which the backing forming fabric slides. The impingement shoe is mounted for at least one of pivoting and transverse movement so that a position of the point of impingement of the jet of papermaking stock can be adjusted by at least one of rotating the impingement shoe about a first pivot point and transversely shifting the impingement shoe. The forming shoe can also be mounted for movement.

Description

technical field [0001] The invention relates to a doctored double fabric forming section of a paper machine and a device for improving the formation of the paper therein. Background technique [0002] Modern twin-fabric (or twin-wire) paper machines are often referred to as gap formers, in which papermaking stock or furnish is supplied from the headbox lip into the gap between two converging forming fabrics. In a gap former, one of two forming fabrics is supported by either wrapping it around a rotating roll surface or by a series of scrapers mounted on stationary support shoes. Consisting of a forming fabric on a support surface. There are two types of gap formers. [0003] In the first type of gap former called roller gap former, the stock jet first impinges on the forming fabric supported on the roll surface; this solution guarantees constant pressure drainage and has excellent fiber Retained, great tolerance for impingement angle variation, but poor sheet formation du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F1/24D21F1/48D21F1/52D21F1/26
CPCD21F1/48D21F9/003D21F1/26D21F1/52
Inventor 沃奥干·维尔德方托马斯·海尔毕克
Owner ASTENJOHNSON INC (US)
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