초록 ▼

A method of continuously producing an elongated strip-like fastener member is disclosed which facilitates highly efficient formation of the fastener member with a great multiplicity of resiliently flexible hook-like projections. The method comprises the formation of an extrusion of plastic material

A method of continuously producing an elongated strip-like fastener member is disclosed which facilitates highly efficient formation of the fastener member with a great multiplicity of resiliently flexible hook-like projections. The method comprises the formation of an extrusion of plastic material which is shaped between a pair of coacting first and second rollers. Notably, one of the rollers defines a plurality of hook-forming cavities about its periphery within which the hook projections of the fastener member are formed. The forming roller is suitably cooled so as to effect substantial reduction in the temperature of the molten plastic extrusion from which the fastener member is formed. In this manner, the fastener member may be removed or stripped from the forming roller without opening of the hook-forming cavities, thus promoting highly efficient formation of the fastener member without resort to unduly complex equipment or processes.

대표청구항 ▼

A method suitable for continuously producing an elongated strip-like fastener member, comprising the steps of: forming a strip-like extrusion of plastic material; providing a first, cooled forming roller having a plurality of hook-forming cavities defined about the periphery thereof, each of said ho

A method suitable for continuously producing an elongated strip-like fastener member, comprising the steps of: forming a strip-like extrusion of plastic material; providing a first, cooled forming roller having a plurality of hook-forming cavities defined about the periphery thereof, each of said hook-forming cavities including a throat portion adjacent the periphery of said forming roller, and an inner end portion communicating with said throat portion, said inner end portion of each said hook-forming cavity extending in a direction generally toward the periphery of said forming roller; providing a second pressure roller in position for coaction with said first forming roller; concurrently rotating said first and second rollers in opposite directions about respective parallel axes; directing said extrusion in between said first and second rollers at an interface thereof so that said plastic material fills said hook-forming cavities to form a base portion of said strip-like fastener member and a great multiplicity of hook-like projections extending integrally from one surface of said base portion; cooling said fastener member to a desired temperature by carrying it on the periphery of said rotating, cooled forming roller; and removing said strip-like fastener member from said first forming roller at a position spaced from the interface of said first and second rollers without opening said hook-forming cavities after sufficiently cooling the hook-like projections so that said hook-like projections are withdrawn from said hook-forming cavities without unacceptable deformation of the hook-like projections, each said hook-like projection having a free end portion extending generally toward the base portion of said fastener member.