Process and apparatus for producing hollow bodies of thermoplast

Details Process and apparatus for producing hollow bodies of thermoplast Process and apparatus for producing hollow bodies of thermoplast

1989-06-30

1991-04-02

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264515, 264541, 264173, 4251331, 425380, 425381, 425462, 425466, 425532, B29C 4904, B29C 4922

Patent

active

050045784

ABSTRACT:
The invention concerns a process and an apparatus for the production of hollow bodies from thermoplastic material, the wall of which is in the form of a laminate, by extrusion blow molding. Tubular preforms for making the hollow bodies are first produced in an intermittent mode of operation, the wall thereof also being in the form of a laminate which includes a suitable number of layers. Within an extrusion head having an annular storage chamber for receiving the laminate-formation preform and an annular piston for emptying the storage chamber, the flows of material for forming the layers of the laminate of the preform are passed through the annular piston into the storage chamber in which they combine to form the laminate. The width of the outlets at which the flows of material issue from the annular piston can be so selected that it is proportional to the thickness of the respective layers to be formed therefrom in the laminate produced in the storage chamber.

REFERENCES:
patent: 3611494 (1971-10-01), Feuerherm
patent: 3985490 (1976-10-01), Kader
patent: 4422838 (1983-12-01), Iwawaki et al.
patent: 4548569 (1985-10-01), Pitigliano et al.
patent: 4565515 (1986-01-01), Maier
patent: 4758144 (1988-07-01), Becker
patent: 4874305 (1989-10-01), McGill et al.

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