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Gap type forming section for a two fabric paper making machine

A technology of forming part and paper machine, applied in the field of gap forming part and double fabric gap forming part, can solve the problems of negative influence of forming fabric deflection control 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Gap type forming section for a two fabric paper making machine
  • Gap type forming section for a two fabric paper making machine
  • Gap type forming section for a two fabric paper making machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] Referring firstly to Figure 1, there is shown a double fabric gap forming section 1 for a paper machine. The forming section 1 is arranged vertically; arrow A indicates the vertical direction.

[0055] The forming section 1 extends from one of the following two positions to the other, i.e. the conveying forming fabric 2 enters the forming section 1 around a first forming roll 3 and the pad forming fabric 4 enters the forming section 4 around a second forming roll 5. The position of the forming section, and the position where the transfer forming fabric 2 and the pad forming fabric 4 are separated after passing around the turning roll 6 . In the forming section 1 the two forming fabrics 2 , 4 sandwich between them the stock layer 7 released from the headbox slice 8 to the point of impact 9 . The two forming fabrics 2 , 4 are moved together through the forming section 1 in the machine direction indicated by arrow 10 . Thus, it is evident that the slurry layer 7 travels ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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PUM

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Abstract

A twin fabric gap former forming section (1) for paper making machine is described in which: the pitch of the fabric support elements (26, 27, 28) decreases progressively in the machine direction; the level of vacuum applied to the forming fabrics (2, 4) through the dewatering boxes (11, 12, 13, 14), increases in the machine direction; the two forming fabrics (2, 4) together with the stock (7) sandwiched between them traverse at least four separate and distinct vacuum zones (24, 19, 20, 21, 22, 23) 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 pre-selected profile; and the dewatering boxes (11, 12, 13) and (14) carrying the fabric support elements (26, 27, 28) are arranged so that the fabric support elements (26, 27, 28) are located in an alternating sequence on the machine sides of both of the forming fabrics (2, 4).

Description

technical field [0001] The present invention relates to a double fabric gap forming section for a paper machine in which stock is sprayed from a headbox slice directly into the gap between two moving forming fabrics. The forming section of the invention therefore does not contain earlier open surface sections using only one forming fabric. The present invention relates to the portion in the forming section between where the forming fabrics come together to sandwich the stock between them, and where the two forming fabrics separate while the stock continues position on one of them. The present invention is suitable for retrofits of double fabric forming sections as well as new build gap forming sections. Background technique [0002] In a gap forming section in a paper machine, the two forming fabrics do not follow a straight path. The forming fabrics pass together through a series of rollers and dewatering boxes arranged in sequence, which alternate on the sides of the tw...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F9/00D21F1/48D21F1/54
CPCD21F1/523D21F9/003D21F1/483
Inventor 沃恩·维尔德方理查德·皮特
Owner ASTENJOHNSON
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