Apparatus for flattening and withdrawing blown continuous plasti

Details Apparatus for flattening and withdrawing blown continuous plasti Apparatus for flattening and withdrawing blown continuous plasti

1986-03-11

1987-01-06

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

2642092, 264564, 425183, 425186, 4253261, 4253871, 425392, B29C 5320

Patent

active

046343580

ABSTRACT:
Apparatus for flattening and withdrawing blown continuous plastic tubular film issuing from a stationary film-blowing head. At least two deflecting rollers are provided for deflecting the tubular film through about 180.degree., and at least two turning rods are also provided for deflecting the tubular film through about 180.degree. and for effecting a simultaneous change in direction. The deflecting rollers and turning rods are disposed in alternation behind each other between squeeze rolls and a pair of rotatable feed rolls, and are mounted on supports which are pivotally movable relative to each other in side arms that include track grooves to permit the deflecting rollers and turning rods to be movable in inward and outward directions, relative to the axis of rotation of the flattening plates, and are adapted to be retained in their inner and outer positions. The deflecting rollers and turning rods are initially at opposite ends of their respective track grooves for start up purposes. A pair of laterally spaced reels having threading tape wound thereon and extending therebetween are positioned vertically above the laterally spaced deflecting rollers and turning rods and are releasable so that one reel can pass therebetween when the apparatus is in the startup position, and so that the leading edge of the film can be attached to the threading tape for threading between the respective deflecting rolls and turning rods. After threading of the film, the deflecting rollers and turning rods are moved transversely along the grooves and in opposite directions to deflect the film through respective 180.degree. turns.

REFERENCES:
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patent: 3632265 (1972-01-01), Upmeier et al.
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patent: 4138453 (1979-02-01), Segl, Jr.
patent: 4246212 (1981-01-01), Upmeier et al.

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