초록 ▼

A method of producing a substantially open-cell, expanded polystyrene sheet, comprising the steps of:forming a mixture comprising from 30 to 95% of polystyrene incorporating an aliphatic hydrocarbon with 4-6 carbon atoms, from 0 to 65% of polystyrene, and from 0.2 to 10% of a nucleating agent,mixing

A method of producing a substantially open-cell, expanded polystyrene sheet, comprising the steps of:forming a mixture comprising from 30 to 95% of polystyrene incorporating an aliphatic hydrocarbon with 4-6 carbon atoms, from 0 to 65% of polystyrene, and from 0.2 to 10% of a nucleating agent,mixing the mixture obtained and melting it by heating inside an extruder,bringing the mixture to a temperature of 130-150.degree. C. in the final portion of the extruder,extruding the mixture in a lower-pressure atmosphere to produce an expanded sheet, which has a low density and a high capacity to absorb aqueous liquids, particularly if a surfactant is added to the starting mixture, and which, when coupled with two films of plastics material gives rise to a laminate suitable for the production, by thermoforming, of trays of foods which may release aqueous liquids.

대표청구항 ▼

1. A method of producing a substantially open-cell polystyrene sheet, comprising the steps of:(a) forming a mixture comprised of (i) from 30 to 95% of polystyrene beads which contain an aliphatic hydrocarbon with 4-6 carbon atoms, (ii) from 0 to 65% of virgin polystyrene beads, and (iii) from 0.2 to

1. A method of producing a substantially open-cell polystyrene sheet, comprising the steps of:(a) forming a mixture comprised of (i) from 30 to 95% of polystyrene beads which contain an aliphatic hydrocarbon with 4-6 carbon atoms, (ii) from 0 to 65% of virgin polystyrene beads, and (iii) from 0.2 to 10% of a nucleating agent, (b) forming a melt of the mixture obtained in step (a) by heating the mixture inside an extruder (c) bringing the melted mixture to a temperature of 130-150.degree. C. in the final portion of the extruder, and (d) extruding the melted mixture in a lower-pressure atmosphere to produce an expanded sheet thereof.