초록 ▼

Apparatus for 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 materia

Apparatus for 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 of the apparatus. Notably, one of the rollers is formed of a series of plates and 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 form 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. The fastener is uniquely configured and includes upstanding hook-like engaging elements having stem portions of at least partially arcuate configuration to produce a combination of properties previously unknown in such fasteners.

대표청구항 ▼

An apparatus for continuously providing an elongated strip-like member which comprises: a first, cooled unitary forming roller having a plurality of hook-forming cavities defined in the periphery thereof and extending inwardly therefrom; a second pressure roller positioned for coaction with said fir

An apparatus for continuously providing an elongated strip-like member which comprises: a first, cooled unitary forming roller having a plurality of hook-forming cavities defined in the periphery thereof and extending inwardly therefrom; a second pressure roller positioned for coaction with said first forming roller; means for concurrently rotating said first and second rollers in opposite directions about their respective generally parallel axes; means for forming a strip-like extrusion of molten plastic material adjacent said first and second rollers to be directed therebetween at an interface thereof such that said plastic material fills said hook-forming cavities and forms a strip-like member having a base portion and a great multiplicity of hook-like projections extending from one surface of said base portion and integral therewith; means for removing said strip-like member from said first forming roller at a position spaced from the interface of said first and second rollers such that said hook-like projections are withdrawn from said hook forming cavities without opening said cavities after being cooled by the first forming roller to a desired temperature.