Tubular plastic film extrusion apparatus with improved adjustabl

Details Tubular plastic film extrusion apparatus with improved adjustabl Tubular plastic film extrusion apparatus with improved adjustabl

1994-06-22

1995-08-15

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

4253261, 4253871, 425394, B29D 2300

Patent

active

054413958

ABSTRACT:
Tubular plastic film extrusion apparatus includes an extruder for extruding tubular plastic film in an upwards direction, and an adjustable sizing cage above the extruder and surrounding the tubular film.
A collapsing frame is located above the sizing cage for collapsing the tubular film to sheet form and trapping air in the tubular film therebelow. The sizing cage has a series of adjustable sizing assemblies circumferentially spaced around the tubular film. Each sizing assembly includes a vertical arm support carrying vertically-spaced horizontally-extending sizing arms engageable with the tubular plastic film, upper and lower parallel levers pivotally connected at inner ends to the vertical arm support and at opposite ends to a fixed location, and an adjuster operable to pivot the upper and lower levers upwardly to cause upward and outer movement of the vertical arm support and the sizing arms carried thereby and to pivot the upper and lower arms downwardly to cause downward and inner movement of the vertical arm support and the sizing arms carried thereby.

REFERENCES:
patent: 3749540 (1973-07-01), Upmeier
patent: 3930781 (1976-01-01), Upmeier
patent: 3980418 (1976-09-01), Schott, Jr.
patent: 4355966 (1982-10-01), Sweeney et al.
patent: 4479766 (1984-10-01), Planeta
patent: 4749346 (1988-06-01), Planeta
patent: 4793790 (1988-12-01), Reinhold
patent: 4815957 (1989-03-01), Schnell et al.

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