Method and system for inerting polymeric film producing machines
AssigneePraxair Technology, Inc.
InventorsRobert Marcel De Wilde, Pascal Yves Duro
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Abstract
This invention is directed to a method and system for using laminar barrier inerting techniques to shroud a selected area in an open space covering the polymeric film outlet and/or raw material inlet with inert gas.
Claims14
A method for producing polymeric film in a film making apparatus having an inert gas distribution system on top of an extrusion head between a hopper inlet and an extruder outlet, said method comprising
- a. providing a portion of inert gas through a laminar barrier into an area covering said extruder outlet;
- b. passing raw polymers into said hopper inlet;
- and
- c. recovering a polymer film product from said extruder outlet.
A method for producing polymeric film in a film making apparatus having an inert gas distribution system between a hopper inlet and an extruder outlet and a conduit between the hopper inlet and the extruder outlet, said method comprising
- a. providing a portion of inert gas into an area covering said hopper inlet;
- b. passing raw polymers into said hopper inlet;
- and
- c. recovering a polymer film product from said extruder outlet, wherein the exit velocity of said inert aas is sufficiently low to avoid turbulence in the conduit.
Dependencies are inferred from the claim text.