Foam Extrusion systems


This system consists of two stages: the plasticization & gas insertion stage, and the cooling stage.
The environmentally friendly physical foaming technology is adopted to achieve lines that accommodate heat resistant polymers from PS, PE and PP, to PET, PEI, and PES.
Efficiency of foam extrusion is improved by the Schaumtandex ZE/KE line which consists of a twin-screw extruder for compounding and a single-screw extruder for cooling. The modular design of the twin-screw extruder's barrel units and screw elements provide an optimal combination of conveying elements, mixing (or kneading) elements, blister and returning elements, depending on the application, enabling the production of high quality products. All barrels for foam processes are gas-tight and can be fitted with spacer rings for injection of the blowing agent. The processing section can be configured to match individual foaming processes using L/D=4D side-feed barrels and L/D=6D combined barrels
The following options are available for barrels:

- Open and closed designs
- L/D=4D side feed barrels and 6D combined barrels.



The Schaumtandex extruder equipped with the patented ASD active melt seal, which seals the plastic processing section from the gearbox end, establishes a new standard in reliability. This special active melt seal effectively meets the constant operating conditions required by sensitive foaming processes involving liquid or gaseous blow agents as well as high system pressures. Because a water cooled liner with spiral groove is adopted at the feed section, a diverse range of pellet sizes can be fed without any complication. Constant feeding is thus assured throughout the entire operational speed range.
The Schaumtandex extrusion system is effective in the production of the following types of foam sheets:

- Packaging for food and electrical appliances
- Foam materials for building insulation such as impact and sound insulation
- Industrial articles such as seals, edge protection strips, and cover seals
- Roof linings, seals, armrests, and impact protection for the automotive industry
- Depending on the line configuration, large outputs of up to 1,500kg/h are possible.
- Processing capability may vary depending on the extent of foaming, type of resin used, product size, and blow agent.