Abstract: A method for impregnating a polymeric granulate with a physical blowing agent is disclosed. The polymeric granulate can be a typical material such as a polycarbonate that is used in foam injection moulding processes. The physical blowing agent can be carbon dioxide which impregnates that polymeric granulate at a temperature range of 40° to 120° C. and a pressure range of 15 to 55 bar. Preferably, the polymeric granulate is heated in a range of 50° to 90° with a range of 60° to 80° preferred. A pressure range of 25 to 45 bar is preferred with a range of 30 to 40 bar more preferred.

Abstract: The invention relates to a method for impregnating a polymer granulate with a predefined mass of a gaseous propellant. According to the invention, the polymer granulate is arranged inside a pressure vessel and a gaseous propellant is introduced into the inside of the pressure vessel.

Abstract: A method for impregnating a polymeric granulate with a physical blowing agent is disclosed. The polymeric granulate can be a typical material such as a polycarbonate that is used in foam injection moulding processes. The physical blowing agent can be carbon dioxide which impregnates that polymeric granulate at a temperature range of 40° to 120° C. and a pressure range of 15 to 55 bar. Preferably, the polymeric granulate is heated in a range of 50° to 90° with a range of 60° to 80° preferred. A pressure range of 0 25 to 45 bar is preferred with a range of 30 to 40 bar more preferred.

Abstract: The present invention relates to a device for drying and impregnating a material with a fluid blowing agent, having a blowing agent source (13) for providing a fluid blowing agent (20), a first vessel (11) set up to dry a material (22) with the fluid blowing agent (20) or a drying gas (25) and to load the dried material (23) with the fluid blowing agent (20) at a pressure of at least 2 bar, wherein the first vessel (11) can be flow-connected to the blowing agent source (13) or to the blowing agent source (13) and a drying gas source (17) for provision of the drying gas (25), and a dryer (14) for removing water (27) from the fluid blowing agent (21) or the drying gas (26), wherein the dryer (14) can be flow-connected to the first vessel (11).

Abstract: For supplying a sink with liquid carbon dioxide with a required temperature of more than 0° C. and with a required pressure of more than 30 bar, liquid carbon dioxide is taken from a tank, in which it has been stored at a temperature below the required temperature and at a pressure below the required pressure. The pressure of the carbon dioxide is increased and then the carbon dioxide is heated to the required temperature.

Abstract: A method for producing a molded part, wherein a molten polymer is introduced into a mold space of a molding tool and liquid carbon dioxide with a pressure of at least 160 bar, preferably with a pressure of at least 200 bar or at least 250 bar is supplied to the mold space, whereby the polymer is pressed against the walls of the mold space and a space is formed in the polymer.

Abstract: A method for producing plastic parts by a gas injection molding method by injecting a melt into a cavity and a flushing gas is fed into the cavity prior to the injection of the melt.

Abstract: In a method of producing a casting, molding or pressing tool (1) or tool insert (2) with at least one material layer (3, 5, 7) and with temperature control medium channels (6) arranged in the at least one material layer (3, 5, 7), the temperature control medium channels (6) are introduced into the at least one material layer (3, 5, 7) using a thermal spray process (2).

Abstract: To supply a consumer (13a, 13b) with liquid carbon dioxide with a desired temperature of more than 0° C. and a desired pressure of more than 30 bar, liquid carbon dioxide is taken from a tank (1) in which it is stored at a temperature below the desired temperature and a pressure below the desired pressure. The pressure of the carbon dioxide is increased (3) and subsequently the carbon dioxide is heated to the desired temperature (14a, 14b).

Abstract: A process and device is provided for cooling extruded hollow sections, especially pipes, that are made of plastic. Liquid or supercritical carbon dioxide is directed into the interior of the plastic hollow section through an extruder head and is depressurized in at least one depressurization nozzle, whereby carbon dioxide in gaseous and solid form is produced. The carbon dioxide that is in gaseous form is directed to the inner wall of the hollow section, while carbon dioxide snow is brought into heat exchange with the inner wall of hollow section only to the extent that the latter is not damaged.