Patents Assigned to Sirap-Gema S.p.A.
  • Publication number: 20030203080
    Abstract: A vacuum or modified atmosphere package for food products which are susceptible to release liquids and/or gases. The package has 1) a tray made of plastic material, having a bottom and sidewalls terminating with a jutting edge. The tray includes at least two layers, of which an inward-facing layer is a sheet of a substantially open-cell expanded thermoplastic material having holes or slots on at least part of its upper surface, and a lower outward-facing layer of a gas-barrier composite film. The tray further has a peripheral frame made of plastic material and having barrier properties with respect to the diffusion of gases, the peripheral frame coupled to the tray edge all around the perimeter thereof and having substantially listel-like sides with an angular cross-section comprising two flanges of which a first flange juts out as a prolongation of the tray edge and a second flange engages the tray edge from beneath.
    Type: Application
    Filed: March 28, 2003
    Publication date: October 30, 2003
    Applicant: SIRAP-GEMA S.p.A.
    Inventors: Luigi Garavaglia, Mauro Bonvini, Fabio Rubechini
  • Patent number: 6235360
    Abstract: 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° 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 for foods which may release aqueous liquids.
    Type: Grant
    Filed: October 21, 1999
    Date of Patent: May 22, 2001
    Assignee: Sirap-Gema S.p.A.
    Inventors: Federico Lanzani, Renato Mauri
  • Patent number: 6093751
    Abstract: 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 for foods which may release aqueous liquids.
    Type: Grant
    Filed: December 11, 1997
    Date of Patent: July 25, 2000
    Assignee: Sirap-Gema S.p.A.
    Inventors: Lanzani Federico, Renato Mauri
  • Patent number: 5833894
    Abstract: A sheet of expanded plastics material with absorbent properties towards aqueous liquids has a structure with intercommunicating cells and comprises at least one surfactant and at least one lubricating agent. The invention also relates to a tray (1) of plastics material for foods which may release liquids, comprising a base (2) and side walls (3), wherein the base (2) has holes (4) of 0.1-1.5 mm diameter in the surface (4) which is intended to contact the food, and is produced from a sheet as described above. Methods of producing the sheet and the tray are also described.
    Type: Grant
    Filed: July 15, 1996
    Date of Patent: November 10, 1998
    Assignee: Sirap-Gema S.p.A.
    Inventors: Federico Lanzani, Renato Mauri
  • Patent number: 5720999
    Abstract: A tray of plastics material for foodstuffs which may release liquids including a base and side walls constituted by an upper layer and a lower layer, the layers forming the side walls being joined together while those forming the base are spaced apart to define an interspace, in which the upper layer is pierced by holes having a diameter of 0.2-1.5 mm and is of foamed plastics material including a surfactant and the surface of the upper layer facing the interspace is rough.
    Type: Grant
    Filed: February 22, 1996
    Date of Patent: February 24, 1998
    Assignee: SIRAP-GEMA S.p.A.
    Inventors: Federico Lanzani, Renato Mauri
  • Patent number: RE37780
    Abstract: 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° 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.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: July 2, 2002
    Assignee: Sirap-Gema S.p.A.
    Inventors: Federico Lanzani, Renato Mauri