Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length
Patent
1993-08-19
1996-07-30
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Production of continuous or running length
264 39, 264565, 264566, 425 721, 4253261, B29C 5528
Patent
active
055408818
ABSTRACT:
The present invention relates to an apparatus for automatically blowing a bubble in the production of tubular biaxially stretch oriented thermoplastic flexible film by the "bubble" method comprising a high flow fluid conduit having a proximal end for introducing a high flow fluid, and a distal end substantially perpendicular to said proximal end, and having attached to said distal end a bullet mounted proximate to the distal end of the high fluid flow conduit through which the high flow fluid may pass into the tubular thermoplastic film; a cutting device located on said high flow fluid conduit and in line with the bullet, said high flow fluid conduit, bullet, and cutting device disposed downstream from a first and second pair of rolls defining the bubble; and an automatic bubble blowing control system means comprising means for controlling the flow of fluid into the interior of the tape, and means for controlling the speed of a driven set of squeeze rolls located downstream from the high flow fluid conduit. A process for the automatic production of the isolated bubble in the production of tubular film is also disclosed.
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