초록 ▼

A process and apparatus for producing a reclosable container stock with adhered occludable closure strip portions, said apparatus comprising a rotatable lay-on roll having circumferential grooves therein, means to advance the closure strip portions to the lay-on roll, a rotatable casting cylinder po

A process and apparatus for producing a reclosable container stock with adhered occludable closure strip portions, said apparatus comprising a rotatable lay-on roll having circumferential grooves therein, means to advance the closure strip portions to the lay-on roll, a rotatable casting cylinder positioned opposite the lay-on roll, means for extruding a molten plastic film onto the casting cylinder so that the film adheres to the closure strip portions, and means for cooling the resulting reclosable container stock with adhered closure strip portions.

대표청구항 ▼

An apparatus for producing plastic film with occludable closure strip portions fused thereto wherein said closure strip portions have profile portions and flange portions, said apparatus comprising feeding means for supplying said closure strip portions; a rotatable, circumferentially grooved lay-on

An apparatus for producing plastic film with occludable closure strip portions fused thereto wherein said closure strip portions have profile portions and flange portions, said apparatus comprising feeding means for supplying said closure strip portions; a rotatable, circumferentially grooved lay-on roll adapted to receive the profile portions of said closure strip portions wherein said lay-on roll has circumferential grooves positioned near the opposite ends of said roll and a recessed area between said grooves; a rotatable casting cylinder positioned opposite said lay-on roll wherein the axis of said casting cylinder is parallel to the axis of said lay-on roll; means for advancing said closure strip portions to said lay-on roll; means to control the tension on said closure strip portions as said closure strip portions are fed to said lay-on roll from said feeding means; extruding means for casting a molten plastic film onto said casting cylinder so that said plastic film becomes fused to said flange portions of said closure strip portions; means adapted to control the lamination pressure exerted by said lay-on roll on said casting cylinder when said closure strip portions are fused to said plastic film; and cooling means for the laminated composite of said plastic film and closure strip portions. A method for producing plastic film fused to occludable closure strip portions having profile portions and flange portions, said method comprising the steps of advancing said closure strip portions to a rotatable, circumferentially grooved lay-on roll so the unoccluded profile portions of said closure strip portions extend into the grooves of said lay-on roll, said lay-on roll having a recessed area between said grooves, controlling the tension on said closure strip portions as said closure strip portions are fed to said lay-on roll, extruding a molten plastic film onto a rotatable casting cylinder positioned opposite said lay-on roll so that said plastic film fuses to said flange portions of said closure strip portions, controlling the lamination pressure exerted by said lay-on roll on said casting cylinder when said closure strip portions are being fused to said plastic film, and thereafter cooling the laminated composite of said plastic film and closure strip portions.