Method of preparing and belling thermoplastic pipe with thickene

Details Method of preparing and belling thermoplastic pipe with thickene Method of preparing and belling thermoplastic pipe with thickene

1977-04-25

1978-09-12

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264296, 264322, 425393, 425DIG218, B29D 2300

Patent

active

041138139

ABSTRACT:
A method and apparatus for expanding and shaping the end portion of a section of thermoplastic pipe to form a so-called "bell" thereon with a raised annular rib defining a sealing groove. The end portion to be belled is differentially heated to provide an intermediate zone of high temperature and plasticity for the rib, between two zones of lower plasticity for a lip and a barrel, the lip zone preferably being of higher plasticity than the barrel zone, and is forced onto a mandrel with radially expandable internal die sections and closable external die sections for shaping the rib. When the pipe is on the mandrel, the bell is thickened by axial compression, and then die-shaped so that the wall thickness increases progressively with the diameter of the rib. Two alternative differential heating methods are disclosed, one heating the different zones in steps, and one using heating chambers of different intensities in a one-step process.

REFERENCES:
patent: 2897545 (1959-08-01), Meissner
patent: 3360826 (1968-01-01), Lorang
patent: 3453359 (1969-07-01), Clement
patent: 3520047 (1970-07-01), Muhlner
patent: 3557278 (1971-01-01), Kuhlemann
patent: 3635639 (1972-01-01), Kresbach
patent: 3849052 (1974-11-01), Gordon
patent: 3865912 (1975-02-01), Rosenkranz
patent: 3899565 (1975-08-01), Hertog et al.

Affiliated with

Also associated with

Rating

Method of preparing and belling thermoplastic pipe with thickene does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of preparing and belling thermoplastic pipe with thickene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of preparing and belling thermoplastic pipe with thickene will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2384382