초록 ▼

Reclosable, separable fastener bags having openable mouths defined by pull flanges are made by providing wall panel sheet material having pull flange area along an edge, uninterruptedly assembling and joining a base surface of substantial width on a preformed extruded plastic resiliently flexible in

Reclosable, separable fastener bags having openable mouths defined by pull flanges are made by providing wall panel sheet material having pull flange area along an edge, uninterruptedly assembling and joining a base surface of substantial width on a preformed extruded plastic resiliently flexible interlocking fastener profile closure strip in face-to-face assembly relation with a surface of the wall panel material along the inner side of the pull flange area, and in the continuous advance of the assembly uninterruptedly securing a minor width portion of the base surface adjacent to the pull flange area as a hinge attachment to the wall panel material but leaving the remainder of the base surface free so that the strip is adapted to swing hingedly relative to the wall panel material, thus permitting the strip to swing hingedly relative to the wall panel due to force exerted against the wall panel from within the bag, but permitting quick separation of interlocked fastener profiles for opening the bag in response to separation pull on the pull flanges.

대표청구항 ▼

A method of uninterruptedly assembling components for making bags having sheet material wall panels and an openable mouth defined by pull flanges adapted to be pulled apart for opening the bags providing preformed wall panel sheet material having a pull flange area along an edge; providing a preform

A method of uninterruptedly assembling components for making bags having sheet material wall panels and an openable mouth defined by pull flanges adapted to be pulled apart for opening the bags providing preformed wall panel sheet material having a pull flange area along an edge; providing a preformed extruded plastic flexible interlocking closure strip, having opposite faces one of which has profile means adapted for separable interlocking with complementary profile means on another closure strip and the other face providing a base surface of substantial width directly opposite said profile means; continuously longitudinally advancing both said sheet material and said fastener strip at the same speed and guiding said fastener strip to cause said base surface to engage in face-to-face relationship with the surface of said wall panel material along the inner side of the pull flange area and substantially spaced from said edge; and continuously securing a minor width longitudinally extending portion of said base surface adjacent to said pull flange area as a hinge attachment to said wall panel material but leaving the remainder of said base surface inwardly from the secured minor width portion free from said wall panel material so that said strip is adapted to swing hingedly relative to said wall panel material.