Turning calibration apparatus and process

Details Turning calibration apparatus and process Turning calibration apparatus and process

1996-12-09

1998-10-27

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Corrugating

2642092, 264310, 264557, 264568, 264569, 4253261, 425336, 425388, 425392, 425396, B29C 4724, B29C 5322

Patent

active

058274685

ABSTRACT:
Convoluted tubing of thermoplastic resin is made by extruding the resin as a molten tubular extrudate, feeding said extrudate into the interior of a rotating tubular member which has a helical thread in the interior of said member, the spiral thread having a deformation zone receiving the extrudate and a cooling zone downstream from the deformation zone. A vacuum can be used to force the extrudate against the spiral thread in the deformation zone to spirally convolute the extrudate. The rotation of the tubular member causes the resultant convoluted tubing to engage the spiral thread in the cooling zone for conveyance through such zone. Apparatus comprising the rotating tubular member with the interior thread for forming the convoluted tubing is provided.

REFERENCES:
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patent: 3660000 (1972-05-01), Yoshida et al.
patent: 3692889 (1972-09-01), Hetrich
patent: 3711232 (1973-01-01), Van Zon
patent: 4017244 (1977-04-01), Vellani
patent: 4038011 (1977-07-01), Lemelson
patent: 4053274 (1977-10-01), Lemelson
patent: 4292014 (1981-09-01), Lupke et al.

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