Process for making sheet-formed reticulated fibrous structures
AssigneeTeijin Limited
InventorsAkira Omori, Isao Okamura, Tadasi Imoto, Tadayuki Katoh
Life of this patent
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Abstract
A process for the preparation of unopened sheet-formed and reticulated fibrous structures, which comprises: A. extruding a molten thermoplastic resin containing a foaming substance through a die with a slit clearance of 0.1 - 1.0mm; B. quenching the extrudate at a point less than 5mm away from the die surface to a temperature below the glass transition temperature of the resin; and C. simultaneously drafting the extrudate at a draft ratio between the maximum draft ratio possible under the conditions and one-third thereof, thereby fibrillating the extrudate just as it leaves the die exit.
Claims8
A process for the preparation of unopened sheet-formed and reticulated fibrous structures, which comprises;
- a. extruding a molten thermoplastic resin containing a blowing agent through a die with a slit clearance of 0.1 -1.0 mm;
- b. quenching the extrudate at a point less than 5 mm away from the die surface to a temperature below the glass transition temperature of the resin;
- and
- c. simultaneously drafting the extrudate at a draft ratio between the maximum draft ratio possible under the conditions and one-third thereof, thereby fibrillating the extrudate just as it leaves the die exit.
Dependencies are inferred from the claim text.