The invention relates to a device (01, 19, 23) for foaming a viscous material (02), said viscous material (02) being conveyed through a first conveyor pipe (05) using a first conveying means (04) at a first conveying pressure, and a gas (07) being conveyed through a second conveyor pipe (08) at a second conveying pressure, and the second conveyor pipe (08) and the first conveyor pipe (05) becoming conjoined at an opening (15), and a discharge device (17) being provided downstream of the opening (15) so as to allow a pressure-relieving discharge of the mixture (14) made up of viscous material (02) and gas (07), a gas injection valve (09) being arranged at the opening (15), said gas injection valve (09) allowing to inject gas bubbles (25) into the viscous material (02).

A system for dispensing a liquid includes a source (24) of a liquid that crystallizes upon exposure to water moisture in air (e.g., an isocyanate). A dispenser (58) includes an inlet conduit (62) for receiving the liquid from the source, an outlet conduit (72) for dispensing the liquid out of an outlet opening exposed to air, and a valve (66) between the inlet (62) and outlet conduits (72). In the closed position of the valve (i) an upstream portion of the liquid is retained in the inlet conduit (62) on the upstream side of the valve (66) and (ii) a downstream portion of the liquid extending from the downstream side of the valve to the outlet opening is retained in the outlet conduit (72) on the downstream side of the valve (66). The size of the outlet opening of the outlet conduit (72) is sufficiently small to retain the downstream portion of the liquid in the outlet conduit when the valve (66) is in the closed position.

The invention relates to a device (01, 19, 23) for foaming a viscous material (02), said viscous material (02) being conveyed through a first conveyor pipe (05) using a first conveying means (04) at a first conveying pressure, and a gas (07) being conveyed through a second conveyor pipe (08) at a second conveying pressure, and the second conveyor pipe (08) and the first conveyor pipe (05) becoming conjoined at an opening (15), and a discharge device (17) being provided downstream of the opening (15) so as to allow a pressure-relieving discharge of the mixture (14) made up of viscous material (02) and gas (07), a gas injection valve (09) being arranged at the opening (15), said gas injection valve (09) allowing to inject gas bubbles (25) into the viscous material (02).

The invention concerns an apparatus (1) for the dispersion of an expansion gas even in supercritical conditions, e.g. carbon dioxide, in a reactive resin, of the kind in which a reaction chamber having an input (27) for gas and an input (37) for resin is provided. Advantageously, the chamber is a dispersion and containment chamber made into a casing (2) of predetermined high resistance susceptible to sustain high pressure and is divided into two sections (6,7) by a head (14) of a dispersion and mixing cylinder-piston group (4) in fluid communication between themselves by means of at least one pouring passage (31, 36, 32, 39) provided with a static mixer (38), motor means (3) being provided for piston (34) control of said mixing cylinder-piston group (4). The invention also concerns a process for the formation of a polyurethane foam starting with the dispersion of carbon dioxide, even supercritical, in a reactive resin in which at least one initial dispersion and mixing controlled phase of the two components is provided in a dispersion and containment chamber under pressure divided into two sections (6,7) by a head (14) of a cylinder-piston mixing group (4) in fluid communication between themselves by means of at least one pouring passage (31, 36, 32, 39) provided with a static mixer (38) and in which adduction, dispersion and mixing occurs under high pressure (at least greater than 75 bar).

Apparatus for producing a mixture of at least one gas and at least one liquid plastic component, includes a mixing device that is connected, via a first pipe, to an introducing device for the at least one gas and is connected, via a second pipe, to a conveying device for that at least one liquid plastic component. The introducing device and the conveying device are designed as piston pumps that have pistons.

A foam molding apparatus and a foam molding method thereby are proposed. The foam molding apparatus includes a foaming agent supply unit configured to supply a foaming agent, a molten resin supply unit configured to supply molten resin, a fixed mixing unit configured to produce a foaming resin-critical solution by mixing a foaming agent supplied from the foaming agent supply unit and molten resin supplied from the molten resin supply unit through a rod-shaped body, and a molding unit configured to mold a foam molding product using the foaming resin-critical solution supplied from the fixed mixing unit. Accordingly, it is possible to produce a foaming resin-critical solution by uniformly mixing a large amount of high-viscosity gel-state molten resin and a high-pressure compressed and low-viscosity foaming agent, using high-strength multiple channels.

A mechanism for mixing a supercritical fluid and a polymer raw material melt provided by the present invention includes a hot-melting unit, a mixing unit, and a supercritical fluid supplying unit. The mixing unit, independently of the hot-melting unit, receives a polymer melt from the hot-melting unit and a supercritical fluid from the supercritical fluid supplying unit, respectively, and mixes the polymer melt and the supercritical fluid into a homogenous single-phase solution. The hot-melting unit is provided with a pushing member for pushing a polymer raw material. The mixing unit is provided with a mixing rotor for mixing the polymer melt and the supercritical fluid.

A device for preparing a liquid polymer blend is proposed having a storage container for the liquid polymer blend; a degassing device, which is arranged downstream of the storage container, for the liquid polymer; a gassing device, which is arranged downstream of the degassing device, for adding an additive gas to the liquid polymer blend; a homogenization unit, which is arranged downstream of the gassing device, for the polymer blend to which the additive gas was added; and an output line, which is connected to the homogenization unit, for the homogenized polymer blend.

A system for dispensing a liquid includes a source (24) of a liquid that crystallizes upon exposure to water moisture in air (e.g., an isocyanate). A dispenser (58) includes an inlet conduit (62) for receiving the liquid from the source, an outlet conduit (72) for dispensing the liquid out of an outlet opening exposed to air, and a valve (66) between the inlet (62) and outlet conduits (72). In the closed position of the valve (i) an upstream portion of the liquid is retained in the inlet conduit (62) on the upstream side of the valve (66) and (ii) a downstream portion of the liquid extending from the downstream side of the valve to the outlet opening is retained in the outlet conduit (72) on the downstream side of the valve (66). The size of the outlet opening of the outlet conduit (72) is sufficiently small to retain the downstream portion of the liquid in the outlet conduit when the valve (66) is in the closed position.

A device includes a source for at least one liquid plastic component, and a metering device. The source intermittently supplies the at least one liquid plastic component for the metering device. A buffer device with a variable buffer volume is arranged between the source for the at least one liquid plastic component and the metering device, and the buffer device is connected to the source via an inlet opening and to the metering device via an outlet opening.