January 01, 1970
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Imported from USA, and used for braiding packing.
Outer ring grooving machine design for making groove of outer ring of spiral wound gasket, controlled by air pump. No longer expensive lathes need; one worker can see after more then 10 machines in same time.
The gasket is made by cutting modified PTFE sheet, and is widely used in medicine, food, petrochemical, paper making and water treatment industries.