Method and apparatus for lay flat control in an extruded...

Details Method and apparatus for lay flat control in an extruded... Method and apparatus for lay flat control in an extruded...

2005-07-26

2005-07-26

Paladini, Albert W. (Department: 2125)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Product assembly or manufacturing

C700S013000, C264S040100, C264S040300, C264S040600, C264S040700, C425S140000

Reexamination Certificate

active

06922608

ABSTRACT:
An apparatus for producing an extruded film tube and supplying said tube to a collapsing and roller assembly includes a die for extruding a molten material in the form of a tube which is in a molten state below a frost line and in a solid state above the frost line. A blower system supplies and exhausts cooling air to and from an interior portion of the tube, and is regulated by a valve. At least two sensors are provided, one below the frost line for sensing the position of said tube, and one located proximate the tube in a position above said frost line. The upper sensor is used for sensing the position of the tube prior to collapsing and flattening it. A controller receives feedback signals from both sensors and controls operation of the valve.

REFERENCES:
patent: 4192637 (1980-03-01), Chong
patent: 6329629 (2001-12-01), Grewell
patent: 6592786 (2003-07-01), Joseph

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