| 摘要 |
1,232,195. Degassing during melting, heat transfer. VICKERS-ZIMMER A.G. PLANUNG UND BAU VON INDUSTRIEANLAGEN. 28 Jan., 1969 [10 April, 1968], No. 4669/ 69. Headings B1M and B1X. A process for melting bulky scrap material formed of one or more synthetic linear high polymers comprises compressing the bulky material in a chamber to reduce its bulk volume by from 50 to 90%, heating the compressed material to melt it, and removing the molten material and gases escaping from the material from the chamber in such a manner that, within the chamber, the direction of movement of the molten material is substantially opposed to the direction of movement of the gases. In the Figure, the scrap material is delivered after drying into compression zone 1 by a conveyor 11 comprising a ribbed roller 12 and a ribbed roller 13 driven by rack 17 via free wheel 20, whereupon the scrap is compressed so that its bulk volume is reduced by from 50 to 90% by the downward movement of piston 3 and is melted as it passes between heating jackets 29 and 30. Space 40 is annular and wedge shaped. The melt passes through port 39 into chamber 41 and is drawn off through aperture 43 for further processing, e.g. by being added to a stream of fresh polymer, and then spun straight into filaments or ropes which are then made into chips. Gasses are drawn off through ventilation port 44. An overload safety device to reduce the stroke of piston 3 comprises insert 6, and pin 8 operatively connected by cup springs. |
