Papermaking machine for forming tissue employing an air press

Details Papermaking machine for forming tissue employing an air press Papermaking machine for forming tissue employing an air press

2007-07-10

2007-07-10

Halpern, Mark (Department: 1731)

Paper making and fiber liberation

Apparatus

Web creping or crinkling type

C162S290000, C162S358100, C162S358200, C162S358300, C162S359100, C162S363000, C162S214000, C162S111000, C162S116000, C162S206000, C162S109000

Reexamination Certificate

active

11073968

ABSTRACT:
A web of tissue is formed in a twin wire former, followed by an air press for water removal in the pressing section, passing onto a Yankee dryer. A headbox injects stock between upper and lower dryer fabrics brought together on a breast roll. The fabrics moves over vacuum boxes, and the web is heated with steam and passed between an upper pressure box and a lower vacuum box forming an air press which dewaters the web. A sheet transfer pickup vacuum box holds the sheet to the upper fabric as the lower fabric diverges from the upper fabric. A pressure roller transfers the web onto a Yankee dryer. The fabrics are cleaned on vertical runs before returning to the breast roll. A final forming fabric is arranged to operated at a lower speed than the penultimate forming fabric so that a rush transfer and creping like action takes place.

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