Process for the production from thermoplastic polymers of superf

Details Process for the production from thermoplastic polymers of superf Process for the production from thermoplastic polymers of superf

1991-03-28

1992-05-19

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

With subsequent uniting of the particles

264 8, 264 12, 264115, 425 7, 425 8, B05B 308, B05D 112

Patent

active

051146312

ABSTRACT:
The process for the production of superfine polymer fibre novwoven fabrics is based on spinning out radically the molten polymer at supply pressure in a rotating nozzle head (6) through a plurality of discharge opening (27) to form fibres and deflecting in the axial direction the not yet completely solidified fibres at a radial distance of 10 mm to 200 mm from the discharge holes (27) by an outer gas stream (8) and afterwards depositing them as nonwoven fabric (15) on a circulating, air-permeable carrier (12). In addition to the outer gas stream (8) an inner gas stream (24) emerges at a lower velocity from a plurality of axial boreholes (23) in the nozzle head (6) at a smaller radial distance than the discharge holes (27). Owing to the centrifugal sweeping forces at the rotating nozzle head (6) a rotationally symmetrical flow field then developes with a predominantly radial velocity component, the temperature of the gas being equal to or greater than the nozzle head temperature.

REFERENCES:
patent: 3806289 (1974-04-01), Schwarz
patent: 4889546 (1989-12-01), Denniston
patent: 4937020 (1990-06-01), Wagner et al.

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