POROUS POLYTETRAFLUOROETHYLENE FILM AND METHOD OF MANUFACTURING THEREOF

FIELD: polymer materials. SUBSTANCE: invention may be applied in production of liquid filters, air filters for purifying interior atmosphere in sterile semiconductor-production rooms, and to create favorable conditions for precision devices in medicine, biochemistry, etc. Film is manufactured by str...

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Bibliographische Detailangaben
Hauptverfasser:	DZUN ASANO, KATSUTOSI JAMAMOTO, OSAMU INOE, TOSIO KUSUMI, OSAMU TANAKA, NOBUKI URAOKA, SINDZI TAMARU, SINITI TAEN
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	FIELD: polymer materials. SUBSTANCE: invention may be applied in production of liquid filters, air filters for purifying interior atmosphere in sterile semiconductor-production rooms, and to create favorable conditions for precision devices in medicine, biochemistry, etc. Film is manufactured by stretching non-molten polytetrafluoroethylene in longitudinal direction at 250-320 C and in transverse direction at 100-200 C. Average pore size of thus obtained film is 0.2-0.4 mcm, and pressure fall in water passing the film at flow velocity 5.3 mm/s is 20-50 mm water column. EFFECT: enhanced filtration efficiency. 7 cl, 2 dwg, 3 tbl, 9 ex