Process for making a multilayered parison of thermoplastic mater

Details Process for making a multilayered parison of thermoplastic mater Process for making a multilayered parison of thermoplastic mater

1985-02-21

1986-05-20

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

156268, 264515, 264138, 264173, 264296, 264322, 425523, 425DIG58, B29C 4904, B29C 4922

Patent

active

045900280

ABSTRACT:
A method is disclosed for making a three layered parison for blow molding a biaxially oriented hollow article of thermoplastic material. One end portion of an extruded tubular body is heated to welding temperature and closed to a bottom by a forming step. The central layer of the multilayered body is removed from part of the end portion before the forming step takes place to insure that the central barrier layer of the body allows for an intimate welding together of the inner and outer layer. A similar operation is used in making the finish portion of a container at the opposite end of the tubular body.

REFERENCES:
patent: 2089991 (1937-08-01), Boicey
patent: 2710987 (1955-06-01), Sherman
patent: 3457337 (1969-07-01), Turner
patent: 3929943 (1975-12-01), Klimaszewski, Jr.
patent: 3970498 (1976-07-01), Loew
patent: 4424182 (1984-01-01), Cerny

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