Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1981-08-17
1983-08-16
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264176F, 425 72S, 4251746, 425192S, 425378S, H05B 100
Patent
active
043990843
ABSTRACT:
The present invention provides a process for producing a fibrous assembly, which comprises extruding a melt of a fiber-forming polymer through a mesh spinneret, said spinneret including many closely arranged small openings and having an opening ratio (.alpha.), represented by the following formula, of at least about 10% ##EQU1## V.sub.a is the total apparent volume of the spinneret which is taken within a unit area of its mesh portion, and V.sub.f is the total volume of partitioning members defining the small openings which is taken within a unit area of the mesh portion of the spinneret; said extrusion being carried out while generating Joule heat in the partitioning members of the spinneret and cooling the vicinity of the extrusion surface of the spinneret by supplying a cooling fluid, whereby the melt is stably converted into fine streams by the partitioning members; and taking up and solidifying the fine streams; and also provides the process wherein the extrusion surface of the spinneret is turned upward so that the normal vector of the extruding surface is reverse to the direction of gravity, and the fine streams extruded from the extrusion surface are taken up against gravity.
The present invention provides a molding apparatus for production of a fibrous assembly having a mesh spinneret which has many closely arranged small openings having an opening ratio .alpha. defined by the above formula of at least 10% and the extrusion surface of the spinneret being turned upwardly such that the normal vector of the extrusion surface is reverse to the direction of gravity.
REFERENCES:
patent: 2623241 (1952-12-01), Mackay et al.
patent: 2820985 (1958-01-01), Cresswell
patent: 3049753 (1962-08-01), Ogden et al.
patent: 3056163 (1962-10-01), Deis
patent: 3797982 (1974-03-01), Borrello
Emi Shingo
Imoto Tadasi
Kiriyama Tsutomu
Norota Susumu
Sagawa Yasuhiko
Teijin Limited
Woo Jay H.
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