摘要:
Forming polystyrene foam by extruding polystyrene, nucleating agent, physical blowing agent, and water where the physical blowing agent and water are injected into extruder to provide blowing system. The product produced has small cells at junction points between membranes of the foam.
摘要:
The method of improving the stiffness of a polystyrene foam cup having a generally closed cell foam sidewall and bottom and a solid plastic film coating on at least the outer surface thereof comprising placing said cup around a heated mandrel, said mandrel having an outside diameter sufficiently less than an inside diameter of said cup to allow the cup sidewall to expand, at a temperature and for a time sufficient to expand the sidewall.
摘要:
Improved automatic machine made heatsealed overwraps on trays with interior self-contained compartments are achieved by having the top surfaces of the dividers for said compartments progressively project above the top surfaces of outside walls.
摘要:
A laminate suitable for use as a graphic arts board comprising two solid ABS resin sheets, said ABS resin containing a pigment and UV stabilizer, said solid sheets being fushion bonded to the upper and lower surfaces of a foam resin core containing polystyrene or a blend of polystyrene and ABS resin, a nucleating agent, and an antistatic agent on the surfaces of the laminate.
摘要:
In a process for extrusion coating of both sides of a foamed polystyrene sheet with a rubber modified polystyrene the specific improvement of crushing the coated foam sheet such that it will rebound to only 30 to 70 percent of its original thickness results in a product of improved processing characteristics. This crushed sheet can be thermally formed into a wrinkle free china-like surface useful in making insulated dishes, trays, food containers and the like.
摘要:
The invention comprises a multi-layer thermoplastic foam sheet comprising a thermoplastic foam layer adjacent to at least one multi-resin layer, preferably comprising a reclaim material mixture recycled from the sheet manufacturing process, and which comprises a thermoplastic barrier resin. In a preferred embodiment, the multi-layer sheet of the invention comprises a four major layer sheet comprising a barrier film layer which comprises a thermoplastic oxygen barrier resin; an inner mutli-resin reclaim layer comprising the oxygen barrier resin used in the barrier film layer; a foam core layer adjacent to the inner multi-resin reclaim layer; and an outer multi-resin reclaim layer, also comprising the oxygen barrier resin, as the other outer layer of the multi-layer sheet. In a more preferred embodiment, impact polystyrene is added to the reclaim layers and polystyrene is used in the foam core to produce multi-layer sheets having an impact-resisting outer layer and a lightweight inner foam core layer, respectively.
摘要:
Container suitable for use in fast food operations which permits longer storage of food products therein while maintaining good quality. Projections are provided on the base of the container to permit air circulation between a prepared food product and prevent deterioration thereof.
摘要:
A method of producing a thermoplastic foam sheet comprising the step of (a) foaming, by extrusion, a mixture comprising polystyrene and a thermoplastic reclaim material obtained from a multi-layer sheet manufacturing process, wherein said thermoplastic reclaim material comprises polystyrene and a thermoplastic barrier resin selected from the group consisting of (i) copolymers of ethylene and vinyl alcohol, and (ii) polymers comprising a copolymer of acrylonitrile, to produce a foam sheet having an upper and lower surface.
摘要:
The invention comprises a method for producing the multi-layer sheets of the invention comprising extrusion coating multi-resin layers onto each side of the foam core layer and then lamination of a barrier film layer onto one of the multi-resin layers.
摘要:
Laminate suitable for use as automobile trim panel or headliner comprising the following layers: (1) polypropylene fabric, (2) a solid layer comprising a physical mixture of a copolymer of styrene and maleic anhydride, preferably a rubber modified copolymer, and polypropylene and (3) a foam of a copolymer of styrene and maleic anhydride. The laminates can be shaped by thermoforming. Optionally the laminate can contain, on the foam side opposite the fabric, a sheet or film of a rubber modified copolymer of styrene and maleic anhydride.