Tube bank structure, and flow tube producing method

Details Tube bank structure, and flow tube producing method Tube bank structure, and flow tube producing method

2005-06-07

2005-06-07

Chin, Peter (Department: 1731)

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

C072S370230, C072S370240, C072S370260

Reexamination Certificate

active

06902651

ABSTRACT:
The invention provides tube bank structure and a method of manufacturing a flow tube, which can improve the stabilization of the flow of stock in the tube bank of the headbox of a papermaking machine and prevent the development of turbulence and uneven concentration of stock flow by a simple and inexpensive means, resulting in speedup of papermaking process. Said flow tubes has a smaller diameter pipe portion of a circular cross-section in the inlet side, a larger diameter pipe portion connected to said smaller diameter pipe portion, a tapered pipe portion, and a rectangular pipe portion, the cross-sectional configuration of said tapered pipe portion being changed smoothly from circular to rectangular configuration.

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patent: 199 37 302 (2001-02-01), None
patent: WO 93/07335 (1993-04-01), None

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