Hybrid type forming section for a paper making machine

A technology for forming section and paper machine, which is applied in the directions of paper machine, wet section of paper machine, and paper making, etc., can solve the problems of negative influence of forming fabric deflection control and forming process, bad influence of paper product quality, etc.

Active Publication Date: 2006-12-27
ASTENJOHNSON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Poor control of the deflection of the forming fabric within the forming section has been found to negatively affect the forming process and in turn the quality of the paper product being manufactured

Method used

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  • Hybrid type forming section for a paper making machine
  • Hybrid type forming section for a paper making machine
  • Hybrid type forming section for a paper making machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] First, see figure 1 , shows a double-fabric hybrid forming part 1 . The forming section 1 is arranged approximately horizontally; arrow A indicates the horizontal direction.

[0051] In the forming section of the invention, a forming zone 60 extends from the breast roll 50 to the couch roll 57 where the sheet is formed on the first forming fabric 2 . The stock layer 7 is sprayed onto the first forming fabric 2 from the headbox slice 8 . In the forming zone 60, the two-fabric hybrid forming section extends from one of the following two positions to the other: namely, the first forming fabric 2 carrying the slurry layer 7 and the second forming fabric 4 contact to sandwich the size layer 7 between them, and the location of the turning roll 9 where the first and second forming fabrics separate. The sheet continues to move on the first forming fabric 2 towards the nip. The two forming fabrics move together through the hybrid forming section so that the sheet moves in th...

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PUM

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Abstract

A twin fabric hybrid forming section for paper making machine is described in which: the pitch of the fabric support elements decreases progressively in the machine direction; the level of vacuum applied to the forming fabrics through the dewatering boxes increases in the machine direction; the two forming fabrics together with the stock sandwiched between them traverse at least four separate and distinct vacuum zones within the forming section as they proceed in the machine direction; the level of vacuum applied to the last of the at least four separate and distinct vacuum zones is higher than the level of vacuum applied to the first of the separate and distinct vacuum zones; the level of vacuum applied to the at least four separate and distinct vacuum zones follows a preselected profile; and the dewatering boxes carrying the fabric support elements are arranged so that the fabric support elements are located in an alternating sequence on the machine sides of both of the forming fabrics.

Description

technical field [0001] The present invention relates to a two-fabric hybrid forming section for a paper machine. In a hybrid forming section, the stock jet is sprayed from the headbox slice onto a first forming fabric that travels in the machine direction on a horizontal plane through a series of forming the dehydration box. A second forming fabric is then brought into intimate contact with the exposed upper paper surface at the start of the two-fabric hybrid forming section. The partially formed paper and undrained stock is sandwiched between two forming fabrics; then drained through the two forming fabrics. The second forming fabric is separated from the upper surface of the formed sheet at the end of the dual fabric hybrid forming section, and the sheet is conveyed on the first forming fabric to a press section. The present invention relates to the portion of the two-fabric hybrid forming section between the positions where the first and second forming fabrics come toget...

Claims

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Application Information

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IPC IPC(8): D21F9/00D21F1/48D21F1/54D21F1/52
CPCD21F1/523D21F9/003
Inventor 沃恩·维尔德方理查德·皮特托马斯·黑尔比希
Owner ASTENJOHNSON
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