Abstract: A pad of a plurality of sealable-unsealable bags comprising a stack of the bags, each bag comprising a front and rear wall closed at the sides and bottom and having a region of access to between the walls; a closure flap as an integral extension of the back wall, the flap having an inside and an outside surface relative to the bag in its sealed condition; an adhesive region located on a portion of the inside surface of the flap; and at least the adhesive-bearing portion of said flap being reverse-folded, outside surface-to-outside surface and the adhesive-bearing inside surface positioned in releasable adhesive contact with a non-adhesive bearing portion of the inside surface of the flap of a preceding bag in the stack.

Abstract: An apparatus for stretching a plastic film around a package is disclosed wherein two handles are secured to the core of the plastic film, one handle effectively extending the core and having a braking cover for dispensing speed control. The other handle includes a U-shaped member to provide a second grip parallel to, but displaced from the axial centerline of the core. The plastic film is configured between the two handles for rotation about the centerline axis of its core.

Abstract: A pack of thermoplastic film bags, which are in at least approximate registration, each bag having a bottom, front and rear bag walls connected by way of gussetted side walls, a bag mouth, double film loop handles at opposite ends of the bag mouth, the handles being integral extensions of the walls; the pack having pack suspension and dispensing means in association with the handles about intermediate between the top and the base of the handles; and the area of the film of each of the handles of the pack adjacent to suspension means being releasably-pressure bonded together, in the absence of an adhesive.

Abstract: A plastic bag, such as a trash bag or the like, of linear low density polyethylene or a blend of low density polyethylene and low density polyethylene has a closure portion along its open end. The closure portion is of a plastic having dead fold properties, such as oriented high density polyethylene or polystyrene. The bag can be closed by twisting the closure portion. The dead fold property of the closure portion will maintain the twisted condition of the closure portion to maintain the bag closed.

Abstract: A thermoforming oven for the convection heating of a continuous web of a thermoplastic foam or film material which is being advanced through the oven towards a thermoformer. Moreover, there is disclosed to a method for the improved and more uniform convective heating of a thermoplastic foam or film material which is advanced through a thermoforming oven. A countercurrent flow of a gaseous heating medium is regulated and directed so as to impart the greatest degree of uniformity of temperature thereto during heating and blow-up to the thermoplastic material being advanced in an intermittent manner through the convective oven.

Abstract: Method of sequentially removing articles from a stack of nested articles and for controlling their movement to a location remote from the stack. The method is particularly suited for denesting and feeding large multiple cell cartons such as eighteen cell cartons to a conveyor for subsequent printing. The cartons are placed in a vertical stack and the stack of nested cartons is supported by a set of rotary brushes on opposite sides at the bottom of the stack. The cartons are preseparated and sequentially fed by a second set of rotary brushes from the bottom of the stack to a denesting station. The height of the stack of cartons at the denesting station is sensed by a photoelectric eye for controlling the rotation of the sets of brushes and the feed of cartons to the denesting station. A pair of counter-rotating feed screws having multiple operating sections denest the cartons at the denesting station and sequentially feed them to a conveyor.

Abstract: A tamper-evident film includes a hydrocarbon polymer core layer (a) having an upper face and a lower face; an oriented tamper-evident layer applied to at least the lower face of core layer (a), layer (b) being fabricated from a mixture of a polyolefin and a filler of particles which induce cavitation upon orientation, layer (b) having an internal cohesiveness which is less than the internal cohesiveness and bonding strength of packaging adhesives and heat seals; and, an oriented skin layer (c) applied to the upper face of core layer (a) if layer (b) has not been applied thereon, layer (c) being hydrocarbon polymer. A tamper-evident package seal and package are also provided.

Abstract: A thermoplastic bag with a separably integral draw strip which is extruded concurrently with the thermoplastic film of the bag body and has a thicker dimension than the thermoplastic film. The draw strip is confined within a tubular channel defining an open mouth for the bag.

Abstract: Films containing LLDPE having a high modulus and good tear strength for the high modulus and improved processing conditions are obtained by blending minor amounts of polystyrene or other aromatic polymer, and polypropylene with the LLDPE.

Abstract: An apparatus for the production of a tubular thermoplastic film, and more particularly, a water bath film cooling apparatus for the rapid quenching of an extruded tubular thermoplastic film so as to enhance the speed of cooling thereof, and increase the strength of the film material. Also disclosed is a method of rapidly cooling a thermoplastic film material through the intermediary of a water bath, utilizing the inventive cooling apparatus. A predetermined internal pressure is maintained within the tube by a gaseous medium, such as air, which is slightly higher than the external pressure imparted to the film tube by the water bath, so as to enhance the speed of cooling of the film materials and increase the strength of the film by minimizing the premature crystallinity thereof upon extrusion of the film and passage through the cooling apparatus.

Abstract: A multi-layer structure of low COF also having antistick characteristics over a wide temperature range during heat-sealing, comprising an amine containing polypropylene core layer having one or more skin layers of a low stereoregularity polyolefin containing, silica and a polysiloxane and a method of forming the same.

Abstract: A male and female mold parts combination for forming a latch opening in a container molded from a softened sheet of plastic having a female mold key member arranged on the female mold part; a male mold key member arranged on the male mold part; a cutting edge adjacent to a planar face of one key and a vertical surface having a bevelled edge surface on the other key. The keys being normally registered so that on closure of the mold parts, initial contact will involve the cutting edge, the bevelled edge surface and the plastic therebetween. One of the keys is fixed in one of the mold parts and the other of the keys being located in the other of the mold parts and free to move independently of its mold part so that on closure of the mold parts the cutting edge will ride off the bevelled edge surface and slide across the vertical surface piercing and enlarging a latch opening in the plastic.

Abstract: A shipping pallet comprising a load deck of plastic shrink wrap film, wrapped about a pallet frame, said film being in its heat shrunk condition. The method of preparing the same comprising, after wrapping the plastic film with heat shrinkable oriented thermoplastic film, subjecting the arrangement to a temperature sufficient to heat shrink the film to a taut product supporting condition.

Abstract: Core/shell polymers containing a rubber-core and a thermoplastic shell acrylate-vinylacetate-acrylic terpolymer having excellent cold seal strength properties.

Abstract: An apparatus for the support of loop handled bag packs of different general geometry which is also adapted for the loading of individual bags from said bag packs, said apparatus including a support means for a bag of first general geometry and a second support means for a bag pack of general geometry.

Abstract: Fork lift truck pallet having a load deck of a plastic stretch wrap film wrapped with tension about a pallet frame.

Abstract: An apparatus for dispensing individual plastic handle bearing bags from a stack of bags and holding the dispensed bag in an open position for loading. The apparatus comprises a bottom support member and two spaced-apart, oppositely disposed upwardly projecting tab members such that the apparatus has an opening corresponding approximately to the size of the open bag it is designed to contain. The upwardly projecting elongated tabs are compatible in size with the open portion of the bag handles and each is adapted to engage a handle of the bag in such manner that the bag is held suspended within the apparatus.