公开(公告)号：DE2507186A1

公开(公告)日：1976-09-09

申请号：DE2507186

申请日：1975-02-20

Applicant: BASF AG

Inventor： SCHOLL KARL HEINZ DIPL ING DR ,  SCHMELZER GERHARD ING GRAD

IPC: B29C48/355 ,  B29C48/92 ,  B29F3/06

Abstract: Semi-finished plastic prod. e.g. a tube, produced by extruding a molten plastic material from an extruder towards a calibration device connected to an electrically driven, withdrawing device. The extrudate is transported between the extruder and the calibration device without use of an intermediate volume-compensating vessel, and the withdrawal velocity is controlled by using the pressure on the molten mass in the extruder as control parameter. System accurately controls the extrusion, transportation, calibration and withdrawal of the extrudate. Damage to the extrudate is avoided. The extrudate has a smooth uniform surface without marks or grooves, and a uniform size over its entire length.

公开(公告)号：DE3107701A1

公开(公告)日：1982-01-14

申请号：DE3107701

申请日：1981-02-28

Applicant: BASF AG

Inventor： HAGEN KARL DIPL ING DR ,  SCHOLL KARL HEINZ DIPL ING DR ,  SCHUHMACHER FRANZ DIPL ING DR ,  SCHMELZER GERHARD ING GRAD

IPC: B29C48/92 ,  G01B21/08 ,  B29D7/02

Abstract: In this process measured values and data are recorded by a thickness measuring instrument traversing perpendicularly to the extrusion direction, digitised into pulses and the actual values determined are compared with digitised set point values. At the same time a local transverse profile and a longitudinal profile, temporarily superimposed on said transverse profile, of the flat films or sheets are recorded. In said process, the measurement path is subdivided, parallel to the extrusion direction, into a plurality of zones, correlating with control zones of an extrusion die. A mean thickness value is formed from each accepted zone on the flat films or sheets, is compared with the computed set point values and the result is used in the production process for control purposes. An overall mean value is then generated from the mean values of all zones, this overall mean value is compared with the overall mean value of a previous or subsequent traverse of the thickness measuring instrument and the take-off rate of the flat films or sheets is varied corresponding to the differences ascertained. A device for carrying out the process consists of a slit die which is subdivided, parallel to the extrusion direction of the flat films or sheets, into a plurality of control zones which can be temperature-controlled independently of one another and of a thickness measuring instrument which is traversable perpendicularly to the extrusion direction and is connected to a power setting unit and/or a process computer controlling a take-off device.

公开(公告)号：DE3007999A1

公开(公告)日：1981-09-24

申请号：DE3007999

申请日：1980-03-01

Applicant: BASF AG

Inventor： HAGEN KARL DIPL ING DR ,  SCHOLL KARL HEINZ DIPL ING DR ,  SCHMELZER GERHARD ING GRAD

IPC: B29C35/00 ,  B29B9/00 ,  B29B13/00 ,  B29B13/08 ,  B29C35/02 ,  B29C35/08 ,  B29C45/00 ,  B29C51/42 ,  G05D23/22 ,  B29B3/00