A method for producing gramophone records by injection moulding, comprises the steps of heating polymeric material to liquefy said material, supplying liquid polymeric material under pressure from a feed zone to a space between two mould parts via a nozzle. The liquid polymeric material is passed through a single passage located in one of the mould parts and forced under pressure through the nozzle into said space. Polyethylene terephthalate isophthalic acid modified copolymer is used as said polymeric material.

In order to create a long-lasting memento for a musical performance for example, which also has a practical use, a coin or medal is designed with an embossed soundtrack. Furthermore, a method for embossing this coin or medal is proposed.

The improved record press is of the type wherein a relatively hot fluid is circulated through the platens to render the puck molten for molding and wherein a relatively cold fluid is circulated through the platens to cool the molten material for ejection. The improvement comprises the use of pressurized water as the relatively hot fluid.

In order to create a long-lasting memento for a musical performance for example, which also has a practical use, a coin or medal is designed with an embossed soundtrack. Furthermore, a method for embossing this coin or medal is proposed.

A method for producing gramophone records by injection moulding, comprises the steps of heating polymeric material to liquefy said material, supplying liquid polymeric material under pressure from a feed zone to a space between two mould parts via a nozzle. The liquid polymeric material is passed through a single passage located in one of the mould parts and forced under pressure through the nozzle into said space. Polyethylene terephthalate isophthalic acid modified copolymer is used as said polymeric material.

A die assembly and a method of forming a vinyl record are provided. The assembly includes a base circular-shaped plate having an outer ring-shaped gasket groove, an inner O-ring groove, and a plurality of concentric grooves extending from a primary surface into the base circular-shaped plate. The assembly includes an O-ring that is disposed in the inner O-ring groove, and an outer ring-shaped gasket disposed in the outer ring-shaped gasket groove. The assembly includes a contacting circular-shaped plate having an engagement surface and a plurality of concentric channels such that a plurality of concentric finger portions are formed on the contacting circular-shaped plate. The plurality of concentric finger portions are partially disposed in the plurality of concentric grooves and contact the base circular-shaped plate.

A method for producing gramophone records by injection moulding, comprises the steps of heating polymeric material to liquefy said material, supplying liquid polymeric material under pressure from a feed zone to a space between two mould parts via a nozzle. The liquid polymeric material is passed through a single passage located in one of the mould parts and forced under pressure through the nozzle into said space. Polyethylene terephthalate isophthalic acid modified copolymer is used as said polymeric material.