Abstract: A coextruded film suitable for packaging a flowable material, particularly milk, in a form, fill and seal machine comprises a core layer of a blend of high density polyethylene and linear low density polyethylene and skin layers of a blend of linear low density polyethylene and ethylene-methyl acrylate copolymer.

Abstract: When a flexible packaging material having a heatseal layer comprising a blend of about 15 to 50 percent polybutylene and about 50 to 85 percent of an ionomer is formed into a package by heatsealing the heatseal layer to itself, the strenth of the heatseal is between about 0.5 and 2.0 pounds per inch, with delamination occurring solely between the heatseal layers when the package is opened.

Abstract: The invention is a flexible packaging material having a narrow band of pressure sensitive adhesive beneath a heatsealable surface layer. When the material is formed into a package, a heatseal is formed along the band of pressure sensitive adhesive. When the heatseal is opened, the pressure sensitive adhesive becomes exposed at the surface of the seal, which enables the package to be resealed by manual pressure alone. A particular advantage of the invention is that the pressure sensitive adhesive is present only in the narrow band, where it is needed to form the resealable seal. The packaging material is made by side-by-side coextrusion.

Abstract: The moisture barrier and heat seal properties of wax coatings on packaging materials are improved by blending with the wax from about 5 to 15 percent of a styrene/ethylene-butylene/styrene block copolymer.

Abstract: Heat sealable paper can be prepared by applying to a surface-sized paper web a coating of a dispersion comprising a microcrystalline wax and a copolymer of ethylene and acrylic acid or methacrylic acid. The coating can be applied by means of a size press between dryer sections in a paper machine. The coating neither adheres to nor leaves a residue on the heated drums in the dryer section following the size press.

Abstract: A coextruded film having an oxygen transmission rate between about 160 and 375, making it especially suitable for packaging fresh produce, comprises a skin layer of polypropylene, a core layer of ethylene-vinyl acetate copolymer, and a heat seal layer of ultra linear low density polyethylene.

Abstract: An article is disclosed comprising a lid engaged to a container by the formation of interlocking waves of lid material and container material at the junction of the lid and container. The interlocking waves are geometrically aligned relative to the interior of the container so as to maximize the burst strength of the container, and also to minimize the force required to peel the lid from the container. An unheated clamp head is used to clamp the lid structure immediately adjacent a heated seal head, the heated seal head being used to form the interlocking wave structure around the inside rim of the container. The clamp head prevents any melted portions of the container or lid from flowing to or towards the outside rim of the container, and thereby prevents the formation of similar interlocking waves about the outside rim of the container.

Abstract: An apparatus is disclosed that engages a lid to a container by the formation of interlocking waves of lid material and container material. The interlocking waves are geometrically aligned relative to the interior of the container so as to maximize the burst strength of the container, and also to minimize the force required to peel the lid from the container. An unheated clamp head of the apparatus is used to clamp the lid structure immediately adjacent a heated seal head used to form the interlocking wave structure about the inside rim of the container, so as to prevent any melted portions of the container or lid from flowing to or toward the outside rim of the container, so as to prevent the formation of similar interlocking waves about the outside rim of the container.

Abstract: A method is disclosed wherein a lid is engaged to a container by the formation of interlocking waves of lid material and container meterial about the interior rim of the container. The interlocking waves are geometrically aligned relative to the interior of the container so as to maximize the burst strength of the container, and also to minimize the force required to peel the lid from the container. An unheated clamp head is used to clamp the lid structure immediately adjacent a heated seal head used to form the interlocking wave structure about the inside rim of the container. The unheated clamp head prevents any melted portions of the containter or lid from flowing to or towards the outside rim of the container. Interlocking waves of material are thereby prevented from forming about the exterior rim of the container.

Abstract: The barrier properties of crystalline polyolefin film can be improved substantially by incorporating a precise amount of a partially incompatible wax into the polyolefin. When the polyolefin is polypropylene or polybutylene, the wax is preferably a paraffin wax. The precise amount of wax, which produces optimum improvement in barrier properties, lies in the range of about 3 to 10 percent based on the weight of the polyolefin. The range in which excellent results are obtained can be broadened by contacting the film with a cooling medium immediately after it is extruded. The film may be annealed to further improve the barrier properties.

Abstract: The barrier properties of a coextruded film having a surface layer comprising a crystalline polyolefin can be improved substantially by incorporating a precise amount of a partially incompatible wax into the polyolefin. The film has an interior layer comprising a polymer that prevents migration of the wax to the other surface of the film so that wax does not interfere with the printability or heat sealability of the other surface. The wax-containing polyolefin layer also protects the interior layer from adverse effects of moisture, such as when the interior layer comprises EVOH. An interior layer of EVOH may be sandwiched between wax-containing polyolefin layers to fully protect it from moisture.

Abstract: Microwave interactive coating compositions are disclosed which comprise finely divided carbon, a powdered inert solid and a binder. A preferred composition comprises finely divided carbon, finely divided microwave reactive metal, powdered inert material and a dielectric binder, preferably an acrylic latex. These compositions are capable of producing microwave reactive heaters comparable to those produced by vapor deposition of metals on a carrier film.

Abstract: A machinable flexible packaging material capable of forming a seal that is reclosable at ambient temperature is made by applying a tacky adhesive and a thin skin layer onto a substrate, such as polyester film. Being thin, the skin layer fractures when the seal is opened, thereby allowing the adhesive to form a resealable interface at the seal area. However, since the adhesive is encapsulated in the material initially, the material may be used like other packaging materials in form, fill and seal machines.

Abstract: A coextruded film having a matte surface layer is prepared by forming the layer from a blend of polyisobutylene and high density polyethylene. The film preferably has a heatseal layer on the other surface. In addition to having low gloss for consumer appeal, the matte surface layer has a medium coefficient of friction for good machinability and excellent heat resistance to facilitate heatsealing. The film is especially useful as an overwrap for packaging consumer products.

Abstract: When a film consisting of high density polyethylene and about three percent polystyrene is run on an interfolding machine to produce interfolded sheets of the film for use as deli wrap, the film is completely and consistently cut in the machine into sheets that are entirely separated from adjacent sheets. In comparison, sheets made from film consisting of 100 percent high density polyethylene are not consistently completely separated from adjacent sheets.

Abstract: Paper employed in an ion deposition printing process can be made antistatic by incorporating into the paper a composition comprising a water-soluble electrolytic salt, such as sodium sulfate, and a water-miscible organic solvent having a high boiling point, such as glycerine. Being antistatic, the paper does not acquire stray charges of static electricity that interfere with the printing process.

Abstract: The concentration of BHT in a flexible packaging material, such as a cereal liner, can be increased by incorporating the BHT into a polymer composition that is extrusion coated onto a substrate, such as PVDC-coated paper. The extrusion coating comprises a heatseal layer and an EVA tie layer containing the BHT. This method substantially prevents evaporation of the BHT. The extrusion temperature is less than the boiling point of BHT.

Abstract: A jumbo roll of toilet tissue wherein the initial section of the roll is perforated and the remainder is unperforated is dispensed from a dispenser having, in addition to a first spindle for supporting the jumbo roll, a second spindle for receiving the preceding roll of tissue after most of the tissue has been consumed. The spindles are secured by means that discourage pilferage of the rolls but permit access to them by an attendant when the rolls are changed. The second spindle is readily detachable and can be mounted on either side of the dispenser.

Abstract: The bond strength of ethylene-methyl acrylate copolymer to polypropylene is improved synergistically by blending between about 10 and 50 percent ethylene-acrylic acid copolymer with the ethylene-methyl acrylate copolymer.

Abstract: This invention provides an improved web transfer mechanism in a paper roll towel dispenser of the type having a primary roll and a reserve roll of paper toweling. The transfer mechanism comprises a cradle for supporting the primary roll that is counterbalanced by an element for tucking the leading end of the reserve roll into the nip between feed rollers. As the primary roll becomes depleted, the counterbalancing force of the roll decreases, causing the tucking element to gradually approach the leading end of the reserve roll until the element finally engages the end and introduces it into the nip. In a preferred embodiment, the device includes a damper mechanism to prevent premature introduction of the leading end caused by the tendency of the primary roll to rise above the cradle by a sudden pull on the toweling.