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 of processes.

대표청구항 ▼

An elongate member, comprising: a base portion; and a great multiplicity of resiliently flexible hook-like projections extending from one surface of said base portion, said hook-like projections including free end portions extending generally toward said base portion, with at least some adjacent one

An elongate member, comprising: a base portion; and a great multiplicity of resiliently flexible hook-like projections extending from one surface of said base portion, said hook-like projections including free end portions extending generally toward said base portion, with at least some adjacent ones of said projections, in a direction along the length of said member, extending in generally opposite directions; said base portion and integral projections being formed from an extrusion of molten plastic material by providing a first, cooled forming roller having a plurality of hook-forming cavities defined about the periphery thereof wherein each said cavity includes a throat portion adjacent the periphery of said forming roller having an inwardly tapering configuration, and each said cavity includes an inner end portion communicating with the throat portion thereof and extending in a direction back 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 said base portion of said strip-like fastener member and with said hook-like projections extending integrally from one surface of the base portion, each said hook-like projection having a free end portion; cooling said fastener member to a desired temperature by carrying it on the periphery of said rotating cooled forming roller through a substantial portion of a revolution of said 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 by maintaining tension on the elongated fastener member thus-formed so that said hook-like projections are withdrawn from said hook-forming cavities, after being sufficiently cooled so that unacceptable deformation of the hook-like projections is avoided, without opening said cavities by drawing the free end portion of each said hook-like projection through the throat portion of the respective one of said cavities, the free end portion of each said hook-like projection extending generally toward the base portion of said fastener member.