Apparatus and process for filtering molten polymer

Details Apparatus and process for filtering molten polymer Apparatus and process for filtering molten polymer

D - Textiles, Paper

01

D

182/124, 18/563,

D01D 1/10 (2006.01) B01D 39/20 (2006.01) B29C 47/68 (2006.01) C04B 35/10 (2006.01)

Patent

CA 1186243

ABSTRACT OF THE DISCLOSURE 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.

406928

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