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Yamashin Industry Inc
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Yamashin Industry Inc
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Application filed by Yamashin Industry IncfiledCriticalYamashin Industry Inc
Priority to JP19429687ApriorityCriticalpatent/JPS6438119A/en
Publication of JPS6438119ApublicationCriticalpatent/JPS6438119A/en
PURPOSE:To obtain a filter medium having high chemical resistance by impregnating fluororesin into a laminate of fibers of glass or the like, hardening the fluororesin and removing the fibers by dissolution in hydrofluoric acid. CONSTITUTION:A filter medium 1 is produced as follows: fibers of glass or the like are laminated to form a sheetlike laminate having a proper thickness and thermoplastic fluororesin having superior chemical resistance is impregnated into the laminate and hardened. All the fibers are then dissolved and removed by feeding a chemical soln. such as hydrofluoric acid so that only the fluororesin is left. The fiber removing stage is preferably carried out after the filter medium 1 is pleated or the assembling of a filter element is completed. Thus, the production of the filter medium can be very simply performed.
JP19429687A1987-08-051987-08-05Chemical resistant filter medium having high performance and production thereof
PendingJPS6438119A
(en)
Process for the production of pipe parts made of plastic, inorganic filler and glass fibers in a centrifugal casting process, and a pipe part produced by this process.