公开(公告)号：DE1196850B

公开(公告)日：1965-07-15

申请号：DEB0069203

申请日：1962-10-12

Applicant: BASF AG

Inventor： RETTIG AUGUST ,  SCHMIDTS KURT ,  DAUR DR THEODOR

IPC: B29C47/88

Abstract: 1,053,528. Tubular films. BADISCHE ANILIN- & SODA-FABRIK A.G. Oct. 11, 1963 [Oct. 12, 1962], No. 40145/63. Heading B5B. Highly transparent films of thermoplastics, e.g. polyolefins are made by extruding a tubular film at a temperature above the softening point of the thermoplastic, passing the film after inflation through an annular cooling zone in which the film is exposed to a gaseous cooling medium flowing at a uniform rate, and squeezing the film after cooling to a temperature below the range of crystallization of the thermoplastic, the thermoplastic being heated in an extruder to a temperature at least 30‹ C. above its softening point, and the tubular film being cooled in the region in which the thermoplastic changes from the plastic condition to the solidified condition, the flow velocity of the cooling medium, emanating from a porous surface, being 1 to 30 m/sec. in the whole region of the cooling zone, and the flow velocity of the cooling medium and the width of the cooling zone being such that the tubular film becomes cloudy in the first third of the cooling zone, adjacent the extruder, and then becomes clear again. The cooling medium may be air or nitrogen, dry or laden with water vapour. Apparatus for the process comprises an extruder, having an annular die, nip rollers for withdrawing the film, and a cooling ring provided in the region in which the film reaches its greatest diameter, the cooling ring surrounding the film and having means for supplying air thereto and having an annular wall facing its axis, and made of porous material. In one embodiment, a tubular film 2 of, e.g. isotactic polypropylene is extruded through die 1 inflated by air line 3 and squeezed between nip rolls 4. A hollow cooling ring 7 is provided with air supply lines 5 and water supply lines 6. Wall 8, facing the axis of the ring is porous and may be made of, e.g. ceramic, felt, multilayer fabric, sponge or particles of metal or plastic sintered together, particularly sintered bronze balls of 1 mm. diameter. In operation, air from 5 escapes from the porous surface and flows uniformly on to the surface of the film. The air may evaporate water contained in the porous material. The film issuing from the cooling zone is highly transparent and has low scattering power.

公开(公告)号：DE1144233B

公开(公告)日：1963-02-28

申请号：DEB0049086

申请日：1958-05-29

Applicant: BASF AG

Inventor： RETTIG AUGUST

IPC: B01F5/00 ,  B01F7/00 ,  B29C47/52 ,  B29C48/76

Abstract: 891,177. Extrusion machines. BADISCHE ANILIN-& SODA-FABRIK A.G. May 29, 1959 [May 29, 1958], No. 18328/59. Class 87(2). [Also in Group II] In a process for mixing and homogenizing solid, plastic and viscous materials (especially polystyrene and polyethylene) the apparatus comprises a disc member 4 rotating in a housing 2 and having spiral grooves on its upper and under surfaces. The material is introduced under pressure by the passage 6 and is conveyed by the spiral groove on the upper side of the disc member 4 to its periphery, round its edge and back to its centre to be discharged at 7 ; a perforated disc 8 may provide back pressure and there may be an extrusion die 9. The spiral groove may be continued round the edge of the disc, see Fig. 3 (not shown). The clearance between the disc and the housing may vary or be constant dependant on the pressure relationships desired, but the volume of each element of the mixing chamber determined by a given angle α continuously increases towards the periphery of the disc so that the rate of flow of the material increases and its pressure decreases. Passages 14 may permit the escape of gas and the introduction of stabilizers, colouring materials and other additives. The disc member 4 is hollow and a fluid cooling medium may be introduced by the annular space surrounding the tube 12, whence it flows from the centre to the periphery of the disc 4, back below the partition 10, 11 and out by the tube 12. If a heating medium is required, it will be caused to flow in the reverse direction.

公开(公告)号：GB891177A

公开(公告)日：1962-03-14

申请号：GB1832859

申请日：1959-05-29

Applicant: BASF AG

Inventor： RETTIG AUGUST

IPC: B01F5/00 ,  B01F7/00 ,  B29C47/52 ,  B29C48/76

Abstract: 891,177. Extrusion machines. BADISCHE ANILIN-& SODA-FABRIK A.G. May 29, 1959 [May 29, 1958], No. 18328/59. Class 87(2). [Also in Group II] In a process for mixing and homogenizing solid, plastic and viscous materials (especially polystyrene and polyethylene) the apparatus comprises a disc member 4 rotating in a housing 2 and having spiral grooves on its upper and under surfaces. The material is introduced under pressure by the passage 6 and is conveyed by the spiral groove on the upper side of the disc member 4 to its periphery, round its edge and back to its centre to be discharged at 7 ; a perforated disc 8 may provide back pressure and there may be an extrusion die 9. The spiral groove may be continued round the edge of the disc, see Fig. 3 (not shown). The clearance between the disc and the housing may vary or be constant dependant on the pressure relationships desired, but the volume of each element of the mixing chamber determined by a given angle α continuously increases towards the periphery of the disc so that the rate of flow of the material increases and its pressure decreases. Passages 14 may permit the escape of gas and the introduction of stabilizers, colouring materials and other additives. The disc member 4 is hollow and a fluid cooling medium may be introduced by the annular space surrounding the tube 12, whence it flows from the centre to the periphery of the disc 4, back below the partition 10, 11 and out by the tube 12. If a heating medium is required, it will be caused to flow in the reverse direction.

公开(公告)号：FR1268710A

公开(公告)日：1961-08-04

申请号：FR837017

申请日：1960-08-29

Applicant: BASF AG

Inventor： HANUSCH FRITZ ,  RETTIG AUGUST

IPC: B29B7/52

公开(公告)号：DE1105159B

公开(公告)日：1961-04-20

申请号：DEB0040552

申请日：1956-06-07

Applicant: BASF AG

Inventor： HANUSCH DR FRITZ ,  HAAS DR HANS ,  RETTIG AUGUST

IPC: C08J3/22 ,  C08L21/00 ,  C08L25/06