Plastic article or earthenware shaping or treating: apparatus – Diverse distinct type shaping means – Shaping orifice and either a downstream preform reshaping...
Patent
1998-02-27
2000-09-26
Pyon, Harold
Plastic article or earthenware shaping or treating: apparatus
Diverse distinct type shaping means
Shaping orifice and either a downstream preform reshaping...
425392, 425 721, 4253871, 264 401, B29D 2300
Patent
active
061235369
ABSTRACT:
A plant for the production of plastic tubular films with a biaxial orientation, includes one or more extruders to feed the molten polymer to an extrusion head; an annular drawplate for extruding a tube; an orientation station in which the tube is heated, expanded by an air bubble and simultaneously stretched in an axial direction. Elements are provided, for compensating the volume of inflation air so as to maintain a constant pressure inside the tube during the orienting process. To this end at least one of the pairs of rollers that feed and pick-up the tube is mobile in a direction parallel to the axis of the tube, and elements are provided to command the shifting of the pair of rollers depending on the diameter of the tube measured during the orienting phase.
REFERENCES:
patent: 3960997 (1976-06-01), Sorenson
patent: 4355966 (1982-10-01), Sweeney et al.
patent: 4978484 (1990-12-01), Takashige et al.
patent: 5046936 (1991-09-01), Bourdiol et al.
patent: 5589561 (1996-12-01), Barry et al.
Del Sole Joseph S.
Pyon Harold
Tecno Coating Engineering S.R.L.
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