Abstract: A continuous method of press forming a sheet resin, which is capable of subjecting to a consecutive process the steps of extruding a molten resin, forming the molten resin into a sheet resin strip, cutting the sheet resin strip into sheet resin pieces and press forming the sheet resin pieces. These steps are continuously carried out synchronously with one another by means of synchronizing devices, while the sheet resin is maintained at the desired temperature so as to possess proper thermoplasticity and surface stiffness through the medium of two thermal controls.

Abstract: A locking slider for sliding clasp fasteners is provided with a locking spring member for locking the slider into position on the fastener. The locking spring member is formed from a strip of stainless steel into a desired shape, the strip having an area higher in the cold rolling modulus than the remaining areas, such that the resiliency inter alia of the formed locking member is increased to an extent sufficient to withstand severe external stresses.