Abstract: A laminate providing an effective barrier to the migration of essential oils and/or flavorings, such as d-limonene and for the retention of Vitamin C, is provided comprising from the outer surface to the inner surface, a paperboard substrate, a web of nylon directly coated thereon, a web of Surlyn overlying and in contact with said nylon web and a web of olefin overlying and in contact with said Surlyn web. Preferably the paperboard substrate is also coated on the external surface thereof with a web of heat sealable polymer. Containers constructed from such laminates are especially useful as fruit juice containers which enable significant flavor and Vitamin C retention in the liquid i.e., fruit juice contained therein over the normal shelf life of the product.

Abstract: A laminate providing an effective barrier to the migration of essential oils and/or flavorings, such as d-limonene and for the retention of Vitamin C, is provided comprising from the outer surface to the inner surface, a paperboard substrate, a web of nylon directly coated thereon, a web of Surlyn overlying and in contact with said nylon web and a web of olefin overlying and in contact with said Surlyn web. Preferably the paperboard substrate is also coated on the external surface thereof with a web of heat sealable polymer. Containers constructed from such laminates are especially useful as fruit juice containers which enable significant flavor and Vitamin C retention in the liquid i.e., fruit juice contained therein over the normal shelf life of the product.

Abstract: A laminate providing an effective barrier to the migration of essential oils and/or flavorings, such as d-limonene, therethrough is provided comprising, from the outer surface to the inner surface, a paperboard substrate, a web of propylene polymer coated thereon and a web of olefin polymer overlying said propylene polymer web. Preferably the paperboard substrate is also coated on the external surface thereof with a web of heat sealable olefin polymer. Containers constructed from such laminates are especially useful as fruit juice containers which enable significant flavor retention in the fruit juice contained therein over the normal shelf life of the product.

Abstract: This invention provides a process for the lamination of a polyester, particularly polyethylene terephthalate, to a paperboard substrate which comprises coextruding a polyester layer and a polymeric adhesive layer onto a paperboard substrate. By use of this process, well adhered coatings of polyester can be obtained where the polyester is used in amounts as low as 10 pounds of polyester per ream. The adhesive layer can be pigmented thereby providing visual enhancement of the laminate product. Moreover, the paperboard can be treated with sizing agents or the like without serious adverse effects on the adherence of the polyester layer. Laminates produced in accordance with this invention are less costly than those of the prior art as they include less polyester per unit of surface.

Abstract: A process for the production of a permanently bonded polyester-polyolefin film laminate is disclosed herein. The process involves exposing the surface of polyester or polyolefin film to contact with a flame so as to prime the surface thereof and thereafter coating the primed surface of the film with a layer of a molten polyolefin or polyester, respectively. Flame priming of the polyester or polyolefin film results in a permanent surface modification of the film. Thus, the time lapse between the priming of the polyester or polyolefin film and the subsequent coating with the molten polymer may be a matter of days, if desired.Multi-layer laminates which comprise a substrate-polyester-polyolefin laminate, e.g., paperboard-polyester-polyolefin laminates, can be provided by the process of the present invention by providing a previously formed laminate of a substrate and a polyester film and flame priming the polyester surface of the laminate.

Abstract: A process and apparatus is disclosed for thermoforming an all plastic carton used to house a fluid with integral, kidney-shaped depressions in adjacent side walls of the carton to serve as handle members to aid in pouring the fluid contents from the carton. A pair of mandrels are inserted through opposite ends of a tubular enclosure formed from the carton blank. The mandrels are provided with a toroidal shaped cavity where they meet inside the enclosure. The enclosure is heated and a pair of complementally shaped, dies are rotated exteriorly of the enclosure into the toroidal cavity in the mandrels on adjacent sidewalls of the carton to form the handle depressions.

Abstract: Disclosed is an improved process for extruding films of thermoplastic polyester film-forming materials. The process enables extrusion of films with reduced problems of neck-in, edge-weave and beading, by laminar flow feeding a small amount of a polymer into the extruder die in the area near both edges of the elongated die opening. The polymer laps said edge portions and thereby provides a controllable edge, which may be cut from the film after drawing the film from the die, and an increase in the usable film area for a given weight of polymer.

Abstract: A pigment-coated paperboard is provided which comprises a paperboard substrate on which there are coextruded a top film of polyethylene terephthalate and an intermediate layer of an acrylic ester copolymer containing from about 1/2 to about 15% pigment particles. Such coated paperboard is particularly suitable for use in containers for food, for book covers, expansion envelopes, business folders and the like. When the pigment is aluminum powder, trays made from the coated paperboard are suitable for use as disposable roller print trays.

Abstract: A process and apparatus is disclosed for thermoforming an all plastic carton used to house a fluid with integral, kidney-shaped depressions in adjacent side walls of the carton to serve as handle members to aid in pouring the fluid contents from the carton. A pair of mandrels are inserted through opposite ends of a tubular enclosure formed from the carton blank. The mandrels are provided with a toroidal shaped cavity where they meet inside the enclosure. The enclosure is heated and a pair of complementally shaped, dies are rotated exteriorly of the enclosure into the toroidal cavity in the mandrels on adjacent sidewalls of the carton to form the handle depressions.

Abstract: An all plastic carton housing a fluid is provided with integral, kidney-shaped depressions in adjacent side walls of the carton to serve as handle members to aid in pouring the fluid contents from the carton. The carton also includes an integral pouring spout having a center line axis lying in a diagonal plane between the side walls of the carton provided with the handle-forming depressions to complement the handles in enabling accurate pouring of the fluid contents of the carton while grasping and tilting the carton. The spout is also formed so as to lie flat on top of the carton when closed thereby facilitating compact shipment and storage and display where shelf space is at a premium.

Abstract: In a multi-layer sheet material from which containers adapted to heat food in microwave ovens may be erected, the sheet material comprising a core layer and a transparent surface layer on each side of the core layer, the improvement comprising an intermediate layer located between the core and at least one of the adjacent surface layers, the intermediate layer being a relatively thin layer of polyethylene terephthalate and a design printed on one side of the intermediate layer whereby the design is visible through the adjacent surface layer and is prevented by the adjacent surface layer from being physically contacted.

Abstract: Disclosed is an improved process for extruding films of thermoplastic polyester film-forming materials. The process enables extrusion of films with reduced problems of neck-in, edge-weave and beading, by feeding a small amount of a polymer which is readily processable with the polyester into the extruder die in the area near the edges of the elongated die opening. The different polymers commingle at the edge portions and thereby provide a controllable edge. In the preferred embodiment, a small amount of a low-to-high density polyethylene is injected into the film-forming die near the edge portion of a stream of polyethylene terephthalate prior to extrusion. The resulting milky-appearing edges are preferably cut from the film, and the film is then adhered to a paperboard substrate.

Abstract: The invention provides a dynamic system for heat-sealing an all-plastic material in a continuous process at high speed. The invention includes an all-plastic heat-sealable container material comprising a multiple-layer composite, in sheet form, including a core layer and at least one outer layer on one side thereof. The layers preferably comprise thermoplastic material, the core layer material having a higher softening point than the outer layer material. The composite sheet is conveyed through a converting, side-seaming or other apparatus at high speed, the system being tuned to dynamically heat the outer layers to a molten state for heat sealing, while the core does not soften but remains undistorted. The core is thus thermally insensitive to heat at speeds used in side-seaming the composite, and as such it supports and maintains the structure of the sealing outer layers on its exterior while they are in a molten condition.

Abstract: A polymeric multiple-layer sheet material particularly suited for making containers for food products to be cooked or reheated in microwave ovens has a relatively thick core layer of foamed, high density polyethylene with thinner surface layers of a coextruded polyester, such as polyethylene terephthalate. The surface layers are preferably bonded to the core by suitable adhesive layers.

Abstract: The invention provides a dynamic system for heat-sealing an all-plastic material in a continuous process at high speed. The invention includes an all-plastic heat-sealable container material comprising a multiple-layer composite, in sheet form, including a core layer and at least one outer layer on one side thereof. The layers preferably comprise thermoplastic material, the core layer material having a higher softening point than the outer layer material. The composite sheet is conveyed through a converting, side-seaming or other apparatus at high speed, the system being tuned to dynamically heat the outer layers to a molten state for heat sealing, while the core does not soften but remains undistorted. The core is thus thermally insensitive to heat at speeds used in side-seaming the composite, and as such it supports and maintains the structure of the sealing outer layers on its exterior while they are in a molten condition.

Abstract: A casting sheet comprising medium to high density polyethylene provides low release resistance when used as a liner for casting concrete articles. The casting sheet may comprise polyethylene-coated paperboard having a polyethylene coating on both sides, and such sheet be employed, for example, as a separator for concrete wall panels cast on-site in a superposed manner for tilt-slab construction or for other concrete construction.

Abstract: A dielectric web substrate is primed for adhesion of a plastic coating by passing between two rolls in rolling contact therewith. One roll has a conductive core and an insulating jacket while the other roll has a conductive surface. A high voltage A.C. source is connected between the conductive portions of both rolls to establish a corona discharge therebetween to effect said priming. Additional rolls with conductive surfaces may be connected in parallel with the first such roll.