By Pira International Ltd
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Additional info for Biopolymer Processing Technologies
However the limited availability and multiple conversion steps makes these wood sugars compared to dextrose economically prohibitive. g. g. housings/enclosures, wind vanes, overhead luggage bins, etc. g. PTT fibers Source: IntertechPira Biopolymers PLA, PHA, Starch blends PLA, PHA, Starch blends Biopolyesters PLA & Starch blends PLA & other biopolyesters PLA, PHA PLA, PHA, Starch blends Biopolyesters, Blends with natural fiber (flax), biopolyurethanes PTT and other biopolyester fibers PTT and other biopolyester fibers PLA & starch blends PLA & high-temp sc-PLA and other biopolyesters Biopolyesters, Biopolyurethanes PLA, PHA Glass filled unsaturated polyesters, epoxies Alkyd and other vegetable oil derived polymers in oil base RETURN TO PAGE Producer & brand PLA NatureWorks (Cargill); Ingeo Purac; Puralact PHA Telles (Metabolix/ADM); Mirel Tianan Biologic Tianjin Green BioScience (DSM jv) PBS Mitsubishi Chemical / PTT jv; GS-Pla Reverdia (DSM/Roquette jv) Ire Chemical; Enpol Bio-urethanes, polyesters & nylons Dow DuPont JV; Cerenol, Biomax & others Arkema; Rilsan-11 Bio-polyolefins Dow / Crystalsev Bioethanol jv Braskem Compounds, starch, etc.
The mold is opened (can be reused again) and the part is finished. Typical uses are molding large parts for transportation such as boat hulls, farm equipment housings, automotive body panels and aircraft wings and other parts. Typical polymers include unsaturated polyesters, epoxy resins, phenolics, etc. More recent uses include wind vane blades for wind electrical generation and structural composites for civil engineered structures like bridges. Because these parts are very large, they can use large quantities of polymers and therefore are potentially strong markets for biopolymers that are derived from liquid bio-monomers such as polyols for unsaturated polyesters and urethanes, and monomers for epoxy resins.
A similar extrusion screw is used for many other processes such as blow molding and injection molding to also create shear and melt the polymer for processing. However, rather than using a die, these molding processes force the melted polymer into a heated mold and the polymer melt conforms to the mold shape, later cooled and recovered as a single part. Blown film also uses extrusion at the beginning stage, where a wide thin wall tube is extruded, then air blown in an upwards vertical direction to further stretch and orient the film, before collapsing the bubble and forming the final film roll stock.