| abstract |
PCT No. PCT/AT90/00054 Sec. 371 Date Feb. 3, 1992 Sec. 102(e) Date Feb. 3, 1992 PCT Filed Jun. 5, 1990 PCT Pub. No. WO90/14935 PCT Pub. Date Dec. 13, 1990The invention relates to a process for the manufacture of new shaped parts, preferably made from chipboards, wherein a mass formed from at least a binder and a small-particled material brought into contact with this binder is subjected to extrusion at elevated temperature and pressure. In the process according to the invention, a mass possessing a total moisture content of 6 to 25 wt. % or adjusted to the stated moisture content and made up of at least one biopolymeric preferably starch-containing binder, which converts into a melt and/or gel at extrusion temperatures and pressures, and further made up of the small-particled material, is subjected to extrusion and immediately thereafter undergoes decompression and spontaneous expansion. A device for carrying out the process according to the invention is also disclosed, and includes extrusion equipment for lump-sized starting components having a processing zone arranged upstream of an extrusion nozzle for carrying out partial decompression, thereby causing partial internal expansion of the mass being processed. |