Process for filtering molten polymer

Details Process for filtering molten polymer Process for filtering molten polymer

1981-07-09

1983-09-20

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

210503, 425198, D01D 110

Patent

active

044055480

ABSTRACT:
Sintered bauxite particles having defined physical and chemical properties are disclosed as being surprisingly eminently suitable as filtration media for molten polymer, such as polyester polymer. Broadly, the particles have a roundness of at least 0.8, and an API standard mesh size of at least 12; in addition, such particles inherently contain significant amounts of ferric oxide. It is preferred that the sintered bauxite particles (i) be microcrystalline, and therefore sintered under critical conditions; (ii) exhibit high crush strength; (iii) be compaction and fracture resistant up to pressures of 6000 psi by defined permeability tests; and (iv) have an API standard mesh size not greater than 70. Also, the sintered particles may have a microporous internal structure and surface.
Also disclosed is an improved annular melt-spinning pack, including a bed of sintered bauxite particles, and means for preventing the bed of free-flowing particles from being deformed during use of the pack.

REFERENCES:
patent: 2266363 (1941-12-01), Graves
patent: 3104419 (1963-09-01), Force
patent: 3896028 (1975-07-01), Phillips

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