Patent ID: 11951667
Assignee: nan
Field: Other special machines (Mechanical engineering)
Classification: CPC B  A  C | IPC A  B

Claim 0:
1. A process for manufacturing a tubular film, comprising:
(a) providing a preblended powder composition comprising a polymer matrix, a plasticizer, and water, wherein the preblended powder composition comprises all of the polymer matrix, all of the plasticizer, and some or all of the water which are present in the tubular film;
(b) feeding the preblended powder composition to an extruder;
(c) heating the preblended powder composition to a temperature above 100 degrees Celsius for a sufficient time to fully hydrate the polymer matrix and to convert the powder composition to a flowable mass;
(d) extruding the flowable mass through a tubular die of the extruder to form the tubular film comprising:
A. Polymer matrix in an amount of about 40-75 wt %;
B. Plasticizer in an amount of about 10-35 wt %; and
C. Water in an amount of about 10-35 wt %.