A gas-injected foam extrusion process is used to produce foamed
So why is it possible for PS, and why can't other thermoplastics be foamed
The fact that foamed
Santoprene can be co-extruded with other compatible thermoplastic materials, such as soft or hard elastomer and/or rigid or flexible polymers, along with other additions, such as substrates and low friction surface technology, all present new product development challenges.
Still, it isn't easy to be a specialist in foamed
Session 6 on development in foamed
products will include the following presentations: "High frequency coaxial cable--an application for microcellular foaming technology in extrusion," Karl Audenaerde and Johannes Lorenz, Kabelwerk Eupen AG, Germany; and "Development of an environmentally friendly thermoplastic printed circuit board manufactured by foam extrusion," Dieter Langenfelder, J.K.W.
Applications for use include foamed
2) that elastomeric alloys may be foamed
using water as the sole mechanical blowing agent.
silicone elastomers may be based on HCR or RTV formulations.
Foam technology has been extended to elastomeric alloys to allow their use in foamed
Other innovations included foam-core sandwich molding (the ICI process), which involved simultaneous coinjection of solid skins and a foamed
And the Societe Pour l'Industrialisation Rationelle du Batiment (IRBA GP) in France pioneered extrusion of foamed
PVC profiles by the Celuka process, which cooled the surface in a calibrator to form a solid skin.
Despite early experiments with sodium bicarbonate--ordinary baking soda--the era of foamed
plastics had to await the results of German work on hydrazine-based rocket propellents during World War II.
Several layers are applied--solid or foamed
, reinforced or unreinforced--and cured in the open mold at ambient temperature.
Utilizing a Cannon shuttle table, 10 windows are being foamed
on one platen while an equal number of parts on a second platen are being unloaded and loaded up for the next batch.
A broad line of additive concentrates for physically and chemically foamed
thermoplastics is newly available from Polyfil Corp., Rockaway, N.J.