| 摘要 |
In the case of the method for the production of polyester granulate or molded articles from a melt which is discharged from a polycondensation (1), the melt in the discharge region (2) of the polycondensation is kept at a temperature between 270-285° C. in communication with a gas chamber at a reduced pressure in order according to the invention to achieve a low acetaldehyde content. With respect to the granulate, within the scope of the method according to the invention, a standard crystallization (5) and drying (6) with air as drying gas suffices. The molded articles can be produced directly from the melt, e.g. with an injection molding machine (9). The device according to the invention comprises a polycondensation, at least the last stage of which is configured as a disc reactor in which, with extensive avoidance of a sump, the melt is transported directly from disc to disc by a combination of rotating disc and static strippers fitted on the circumference of the reactor. In the discharge region, the melt is conveyed directly into the discharge unit by static strippers without an accumulation of melt occurring here. |
