| 摘要 |
A three-layered film, which has two outer layers of high pressure, ow density polyethylene and a core layer of low pressure, low density polyethylene, is produced in an extruder at 176.7oC - 315.6oC at the production rate of 4-25 lbs per hr and sq. in. of the mold where no fracture of melted products occurs.
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