摘要:
Degradable foamed lactic acid polymer products, such as trays and containers in general, are produced by the extrusion of the polymers by additioning a foaming agent selected from nitrogen, carbon dioxide and mixtures thereof, in the absence of additional additives as foaming adjuvants selected for example from foaming aids, blowing agent stabilizers, thickeners, and at a temperature within the range of Tm+ 10°C and Tm-30°C, particularly Tm and Tm -10°C wherein Tm is the melting temperature of the polymer.
摘要:
An expanded extruded polystyrene sheet is described, containing 0.5% to 3% polyethyleneterephthalate (PET) by weight of the polystyrene weight and /exhibiting an integral compact layer on at least one of its surfaces, as well as a method for the production of said sheet comprising the steps of forming a mixture comprising polystyrene and 0.5%-3% of (PET), melting the mixture by heating inside an extruder, adding a blowing agent to the melt mixture and extruding the mixture in an environment at lower pressure through a die, cooling the sheet on exit from the die on at least one of its surfaces by means of air blow.
摘要:
The use of a tray (V) in plastic material is described for packaging foods susceptible of releasing liquids, in which such tray (V) is made of a sheet (4) of an expanded plastic material of high water permeability, preferably open-celled, as well as a modified atmosphere packaging comprising such tray and a method for manufacturing such packaging.
摘要:
The invention refers to a package (1) comprising a rigid or semi-rigid flat support (3), possibly perimetrically provided with walls (9) and with a raised edge (7), a first flexible plastic film (4) coupled to the support (3) at a face thereof, such first plastic film (4) being a film which can be peeled from the support (3), a food product (2) arranged on such face of the support (3), a second plastic film (5) superimposed on the first plastic film (4) wherein the first and second plastic film (4, 5) are bound together along a peripheral band with the formation of a substantially sack-shaped sealed casing (6) containing said food product (2), such sealed casing (6) being detachable from the support (3) substantially by pulling.
摘要:
The invention refers to a sheet of plastic material comprising a foamed extruded polystyrene layer having an average density coupled with a - flexible plastic film having barrier properties against gases, such sheet being particularly indicated for use in the manifacture of trays for packaging food products and for food packages in a protective or modified atmosphere.
摘要:
Degradable foamed lactic acid (co)polymer products, such as trays and containers in general, are produced by the extrusion of the (co)polymers in the presence of a foaming agent selected from nitrogen, carbon dioxide and mixtures thereof, at a temperature within the range of T m + 10°C and T m -30°C, where T m is the melting temperature of the (co)polymer.
摘要:
A process for manufacturing expanded polystyrene meat trays characterised by the following steps: plasticizing at a temperature higher than 200°C in an extruder a mixture comprising polystyrene, cellulation regulator materials, inert material in fine powder form and mineral oil; injecting an expanding agent into a zone of the extruder in which the various ingredients have already undergone homogenization; cooling the material to a constant temperature between 140°C and 160°C; extruding the material through a die; winding the sheet obtained by extrusion into rolls; maintaining the rolls at ambient temperature for a period from 1 to 30m days; heating the sheet to a temperature between 120°C and 180°C; thermoforming the sheet by drawing in moulds.
摘要:
A process for the production of extruded sheets of expanded polystyrene, which only uses expanding agents with low environmental impact, comprising the steps of : a) heating polystyrene or a mixture composed of polystyrene and at least one component selected from the group consisting flame retardants, coloring agents, plasticizers, heat stabilizers and lubricants at a temperature in the range of 180-2500C thus obtaining a polymer melt, which is subjected to homogenization; b) adding to the polymer melt a mixture of expanding agents (4) comprising carbon dioxide and water; c) homogenizing the polymer melt including said expanding agents; d) homogeneously cooling the polymer melt to a temperature lower than or equal to 1400C; e) extruding the cooled polymer melt through a die (8) to obtai an expanded polystyrene sheet.
摘要:
The invention refers to a package (1) comprising a rigid or semi-rigid flat support (3), possibly perimetrically provided with walls (9) and with a raised edge (7), a first flexible plastic film (4) coupled to the support (3) at a face thereof, such first plastic film (4) being a film which can be peeled from the support (3), a food product (2) arranged on such face of the support (3), a second plastic film (5) superimposed on the first plastic film (4) wherein the first and second plastic film (4, 5) are bound together along a peripheral band with the formation of a substantially sack-shaped sealed casing (6) containing said food product (2), such sealed casing (6) being detachable from the support (3) substantially by pulling.