(NL1004572-C2)      A plastic object having a sandwich structure with a foamed core and closed skin is made by injection moulding in a mould having two mould parts displaceable relative to one another. The moulding machine has means for suppressing foaming in the mould cavity and these are effectuated before moulding. A plastics material is heated and injected into the mould cavity. The plastics material is a mixture of up to 20 wt.% high melt strength polypropylene with at least one other plastics resin and contains a foaming agent. Foam suppression is ended after heating and injection of the plastics material is started but before heating and injection of the plastics material has ended. After heating and injection has ended, the mould parts are moved apart at a chosen speed so that the moulded object cools to a chosen temperature before the mould is fully open and the object is removed.    USE -   Manufacture of thermal or acoustic insulation boards, including boards having a shaped or bent edge. Mechanical strength, vibration or shock damping properties, skin thickness and bending stiffness of the board can be controlled and the board may have resistance to pull-out of screws and inserts.    (EP948428-A1)      A plastic object having a sandwich structure with a foamed core and closed skin is made by injection moulding in a mould having two mould parts displaceable relative to one another. The moulding machine has means for suppressing foaming in the mould cavity and these are effectuated before moulding. A plastics material is heated and injected into the mould cavity. The plastics material is a mixture of up to 20 wt.% high melt strength polypropylene with at least one other plastics resin and contains a foaming agent. Foam suppression is ended after heating and injection of the plastics material is started but before heating and injection of the plastics material has ended. After heating and injection has ended, the mould parts are moved apart at a chosen speed so that the moulded object cools to a chosen temperature before the mould is fully open and the object is removed.    USE -   Manufacture of thermal or acoustic insulation boards, including boards having a shaped or bent edge. Mechanical strength, vibration or shock damping properties, skin thickness and bending stiffness of the board can be controlled and the board may have resistance to pull-out of screws and inserts.    (JP2001504405-W)      A plastic object having a sandwich structure with a foamed core and closed skin is made by injection moulding in a mould having two mould parts displaceable relative to one another. The moulding machine has means for suppressing foaming in the mould cavity and these are effectuated before moulding. A plastics material is heated and injected into the mould cavity. The plastics material is a mixture of up to 20 wt.% high melt strength polypropylene with at least one other plastics resin and contains a foaming agent. Foam suppression is ended after heating and injection of the plastics material is started but before heating and injection of the plastics material has ended. After heating and injection has ended, the mould parts are moved apart at a chosen speed so that the moulded object cools to a chosen temperature before the mould is fully open and the object is removed.    USE -   Manufacture of thermal or acoustic insulation boards, including boards having a shaped or bent edge. Mechanical strength, vibration or shock damping properties, skin thickness and bending stiffness of the board can be controlled and the board may have resistance to pull-out of screws and inserts.    (US6277896-B1)      A plastic object having a sandwich structure with a foamed core and closed skin is made by injection moulding in a mould having two mould parts displaceable relative to one another. The moulding machine has means for suppressing foaming in the mould cavity and these are effectuated before moulding. A plastics material is heated and injected into the mould cavity. The plastics material is a mixture of up to 20 wt.% high melt strength polypropylene with at least one other plastics resin and contains a foaming agent. Foam suppression is ended after heating and injection of the plastics material is started but before heating and injection of the plastics material has ended. After heating and injection has ended, the mould parts are moved apart at a chosen speed so that the moulded object cools to a chosen temperature before the mould is fully open and the object is removed.    USE -   Manufacture of thermal or acoustic insulation boards, including boards having a shaped or bent edge. Mechanical strength, vibration or shock damping properties, skin thickness and bending stiffness of the board can be controlled and the board may have resistance to pull-out of screws and inserts.