Method of manufacturing resin tubes alternately having a thick w

Details Method of manufacturing resin tubes alternately having a thick w Method of manufacturing resin tubes alternately having a thick w

1975-09-24

1977-07-19

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Of varying cross-sectional area or with intermittent...

264 407, 264 90, 264209, 425377, 425465, B29D 2304

Patent

active

040369307

ABSTRACT:
Resin tubes having thick walled portions and thin walled portions are formed by providing a specially configured orifice on an extruder and varying the rate at which the extruded resin tube is pulled from the extruder. The orifice is shaped to form a thin tubular opening and a thick tubular opening communicating with one another, the thick tubular opening being adjacent and down-stream of the thin opening. When the extruded resin tube is pulled at a high speed the thin tubular opening is filled with resin that passes through but does not fill the thick tubular opening. At the slow pulling speed the resin fills at least the open-end portion of the thick tubular opening thereby forming a thick walled portion of the resin tube.

REFERENCES:
patent: 3264383 (1966-08-01), Niessner et al.
patent: 3928519 (1975-12-01), Kashiyama et al.

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