Abstract: Polymeric, oriented films can be made by the use of a combination of a hot blown process and a blown bubble process. Styrene butadiene copolymer (SBC) forms two outer layers of the preferred embodiment, with a core layer of very low density polyethylene (VLDPE) or blends thereof, and intermediate polymeric adhesive layers such as ethylene vinyl acetate copolymer (EVA) bonding the core layer to the outer layers. A monoaxially or biaxially oriented film is produced with excellent optics.
Type:
Grant
Filed:
February 26, 1992
Date of Patent:
June 15, 1993
Assignee:
W.R. Grace & Co.-Conn.
Inventors:
Henry G. Schirmer, Stephen F. Compton, Martin Nelson
Abstract: An enclosure suitable for enclosing aerial cable splices comprises an elongate generally cylindrical housing comprising a first, second, and third member, a first elongate hinge connecting the first and second members together, a second elongate hinge connecting the second and third members together, at least one female boss disposed on an outside surface of each of the first and third members, and at least one male boss disposed on an outside surface of the second member such that the first and third members can be releasably locked in an open position by means of the respective bosses.
Abstract: Hot and cold heat seals are obtained in a multiple layer cook-in film from which packages such as bags or casings can be made wherein the films have a first food contact layer that adheres during cook-in to a contained meat product and wherein the first layer comprises a blend of a first and a second polyamide, preferably with a small amount of an antioxidant.
Abstract: A method for printing a web along the entire transverse width of the web, while avoiding ink build up on an impression cylinder, comprises passing the web between a printing cylinder and an anilox roll, and applying ink from the anilox roll to the web such that the ink covers substantially the entire width of an outer surface of the web.
Abstract: A barrier foam tray contains recycled reclaim of barrier foam. The tray comprises a sheet of foamed polystyrene (PS) having laminated to it a flexible barrier film. The foamed polystyrene part can have admixed therein from 0.0001% up to 30% by weight of the flexible barrier film. The barrier film contains a barrier polymer such as ethylene vinyl alcohol copolymer (EVOH). The tray is made by grinding laminate scrap and extruding reclaim therefrom with virgin polystyrene.
Type:
Grant
Filed:
October 1, 1990
Date of Patent:
June 2, 1992
Assignee:
W. R. Grace & Co.-Conn.
Inventors:
Gerald G. Gusavage, Thomas A. Hessen, Thomas R. Hardy, Susan R. Flye, Henry G. Schirmer
Abstract: A multilayer laminate comprises a machinable inner component perforated film, preferably of a propylene homopolymer or copolymer, a first outer component film bonded to one side of the inner component film, and a second outer component film bonded to the opposite side of the inner component film, each of the first and second outer component films providing high gas permeability and low moisture transmission and including a bonding layer of ethylene copolymers and an outer heat sealable layer.
Abstract: A multilayer laminated film useful in chub packaging comprises a core film comprising a biaxially oriented film, and an outer hot blown film bonded to each of the opposing surfaces of the core layer, at least one of the films including a layer of an oxygen barrier polymeric material.
Abstract: Discoloration of meat products due to oxygen starvation in stacked packages is significantly reduced by applying a textured surface to the bottom of the packages. A discrete textured film may be adhered to a tray or supporting member, or the tray or supporting member may itself be textured at its bottom surface.
Abstract: Disclosed is an oriented, heat-shrinkable, packaging film having a layer of polyamide or polyester. The film has a high shrink energy and high modulus.
Type:
Grant
Filed:
December 8, 1989
Date of Patent:
January 7, 1992
Assignee:
W. R. Grace & Co.-Conn.
Inventors:
Steven B. Garland, Donald J. d'Entremont
Abstract: A multi-layer film useful in vacuum skin packaging and other vacuum packaging applications, and having a combination of good implosion resistance, formability and high oxygen barrier characteristics, includes a core layer having an oxygen barrier material, intermediate layers of EVA or other ethylene homopolymer or copolymers, polymeric adhesive layers which bond the intermediate layers to respective surfaces of the core layer, a first outer heat-sealable layer, a second outer heat resistant layer, and two moisture resistant layers disposed between respective outer and intermediate layers.
Abstract: Packaging apparatus, using an upper film (6) pre-heated before contact with a lower film (9) on which products (not shown) are placed, has at least the central region heated by radiant heaters (7) and the marginal regions heated by hot air nozzles (10) at least in the region immediately preceding contact (8) between the upper and lower films.
Abstract: A first web having an ionomer, or ionomer/ethylene vinyl acetate copolymer (EVA) sealant layer, heat sealed to a second web having an EVA/ethytlene butene copolymer (EBC)/polypropylene (PP) sealant layer, forms an easily opened package. A layer adjacent the sealant layer of the second web optionally includes PP or ethylene propylene copolymer. With this optional layer, the sealant layer of the first web may comprise a polymeric material which forms strong interweb adhesion upon heat sealing.
Abstract: An easily opened package is made by heat sealing a first web to a second web. The sealing layer of the first web is a blend of polybutene and polypropylene with a third polymeric material of ethylene vinyl acetate copolymer. Low density polyethylene, linear low density polyethylene, or ionomer. The sealant layer of the second web is ethylene vinyl acetate copolymer, low density polyethylene, linear low density polyethylene or ionomer.
Type:
Grant
Filed:
April 12, 1990
Date of Patent:
June 11, 1991
Assignee:
W. R. Grace & Co.-Conn.
Inventors:
Gregory R. Pockat, Carl C. Christenberry, Paul J. Satterwhite
Abstract: A multilayer layer cook-on film utilizes a linear low density polyethylene sealant and, in place of a relatively thick and expensive adhesive layer, two thin adhesive layers having between them an intermediate layer of ethylene alpha-olefin copolymer.
Type:
Grant
Filed:
September 29, 1988
Date of Patent:
March 5, 1991
Assignee:
W. R. Grace & Co.-Conn.
Inventors:
Gregory R. Pockat, Hubert J. Cook, Paul J. Satterwhite