초록 ▼

A machine and method of extruding a fastener product is disclosed. The product has a continuous, sheet-form base and rows of discrete fastener elements that extend from a side of the base, and is formed by extruding a molten polymer through an extrusion die defining a die opening comprising a base o

A machine and method of extruding a fastener product is disclosed. The product has a continuous, sheet-form base and rows of discrete fastener elements that extend from a side of the base, and is formed by extruding a molten polymer through an extrusion die defining a die opening comprising a base opening for extrusion of the base of the product, and, contiguous therewith, a series of fastener element openings for extrusion of the rows of fastener elements, each fastener element opening having a profile configured to form oppositely directed sides of the discrete fastener elements of one row. While extruding the product, flow of polymer through the fastener element openings is periodically interrupted while continuing the flow of the polymer through the base opening, thereby forming rows of upstanding fastener elements integrally extruded with a sheet-form base. Fastener products formed by this method are also disclosed.

대표청구항 ▼

[ What is claimed is:] [17.] A method of forming a fastener product having a continuous, sheet-form base and rows of discrete fastener elements that extend from a side of the base, the method comprisingextruding a molten polymer through an extrusion die defining a die opening comprising a base openi

[ What is claimed is:] [17.] A method of forming a fastener product having a continuous, sheet-form base and rows of discrete fastener elements that extend from a side of the base, the method comprisingextruding a molten polymer through an extrusion die defining a die opening comprising a base opening for extrusion of the base of the product, and, contiguous therewith, a series of fastener element openings for extrusion of the rows of fastener elements, each fastener element opening having a profile configured to form oppositely directed sides of the discrete fastener elements of one row; whileperiodically interrupting flow of the polymer through the fastener element openings, while continuing flow of the polymer through the base opening, thereby forming rows of upstanding fastener elements integrally extruded with a sheet-form base; andvarying the frequency of said interruption so as to vary the longitudinal spacing of said fastener elements.