Abstract: A device and method for repositioning sliders on profiled resiliently flexible zipper on bag sections of bag making material travelling along a manufacturing path. The device may comprise a frame, two movable rollers cooperatively opposed to one another mounted on free ends of arms which are pivoted and adapted for moving the rollers toward and away from one another. When the rollers are in close adjacency they are adapted to restrain the sliders for a predetermined interval while the zipper travels on with the bag making material whereby to reposition the slider properly with respect to transverse bag side sealing of the bag sections. The rollers are operable to shift the sliders in opposite directions along the zipper in the cyclical operation of the associated apparatus, whereby to test proper functioning of the sliders.

Abstract: An improved method and mechanism for forming a chain of laterally interconnected plastic bags which have confronting releasably interlocking rib and groove profile elements on the inner confronting wall surfaces or at the edge of said surface including advancing a tube or a folded film of plastic bag material having interlocked rib and groove profile elements, forming spaced spot seals at the profile element and alternately at another location to permanently join the layers of material and permanently join the rib and groove elements over the area of the spot, forming lateral seals extending the width of the material at the location of the spot seals to provide side seams for the adjacent bags, and cutting through the material along the center of the seam to partially separate the bags with the cuts extending a predetermined distance partially into the spot seals to control their remaining strength and control the separation force needed to separate adjacent bags.

Abstract: A pinch bottom open mouth ("PBOM") bag having a pinch bottom flap folded over upon and adhered to one wall of the bag, with a tab for tearing the flap open inserted at its inner end between the walls of the bag, folded to overlie the flap and the outside of the other wall and releasably adhered to the other wall, and a method of and apparatus for manufacturing the bags with the tabs from bag tubes wherein the tubes are continuously fed forward, one after another, tabs are applied to the tubes as the tubes travel forward and folded to overlie said other wall before the pinch closure flap is folded over, and wherein each tab is inserted between the walls of a tube by bringing the tab into a position overlapping said one wall and separating said one wall from the other to the point where the end of the tab slips off said one wall and becomes disposed between the walls.

Abstract: Self-contained reusable pour spout structure is made by means and methods compatible with low-cost bag production machinery and methods. Thus, a memory strip with an internal metallic strip and an external cover compatible with attachment to the bag material by heat welding, gluing or sewing, is simply placed at a desired access opening position, attached along its length on one bag layer and attached at opposite ends to two bag layers with the intervening distance unattached to the second bag layer. This strip then is manually deformed into a bowed position to open the spout and is straightened to close the spout over a plurality of use cycles. The bags so made are useful for containing and dispensing candy, cereal and like products.

Abstract: 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 respon

Abstract: A payout coil of tape for forming substantially instantly openable and reclosable package closures over the flattened mouths of packages in mechanized packaging operations. The tape is a unified structure having a layer of solid non-tacky thermoplastic polymeric material. Optionally, the only layer of a tape may be a polymeric layer; and the polymeric layer may exhibit adhesive properties. Tapes with a backing are preferred, as are tapes which include a layer of adhesive activatable to tackiness at elevated temperatures and remaining tacky at temperatures lower than those at which the polymeric layer exhibits tackiness. The adhesive layer may be separately applied as a hot melt at the time of adhesively fixing the tape to a package. A tearstrip structure is integrally conjoined with and preferably embedded in the polymeric layer, and at least one deformable deadfold strip is also embedded in the polymeric layer.

Abstract: In an apparatus for forming and separating the side edges of plastic bags of the type which have opposed interlocking closure strips, an intermittent transport device transports a half-tube of thermoplastic sheeting to a welding device. The sheeting is stopped while welding is performed. At a milling station upstream of the welding device, a milling apparatus is actuated while the half-tube is stopped to mill off a short length of each of the opposed closure strips at a position which coincides with the position at which welding will later be performed.