公开(公告)号：DE2757258A1

公开(公告)日：1979-07-05

申请号：DE2757258

申请日：1977-12-22

Applicant: BASF AG

Inventor： THEYSOHN RAINER DIPL CHEM DR ,  NOETZEL WOLFRAM DIPL CHEM DR ,  PFIRRMANN GUENTHER DIPL CHEM D ,  ZEITLER GERHARD DIPL CHEM DR

IPC: C08K3/22 ,  C08L23/02 ,  C08L25/04 ,  C08L97/02 ,  C08L23/00 ,  C08K7/02

公开(公告)号：DE2312123A1

公开(公告)日：1974-09-12

申请号：DE2312123

申请日：1973-03-10

Applicant: BASF AG

Inventor： NOETZEL WOLFRAM DIPL CHEM DR ,  LINDNER EDMUND DIPL ING ,  KRESS GERHARD DIPL ING

IPC: B29C47/00 ,  B29C48/90 ,  B29D7/02

Abstract: In mfr. of plastics tubular film where a prim. tubular film is produced by (A) extrusion of plastics through an annular die, the plastic having a temp. > m.pt. and the prim. tube having 2-300 cm. dia and 20-1500 mu wall thickness; (B) cooling the prim. tube immediately before it issues from the die without altering its dimensions; and (C) blowing it to 4-3000 cm dia. immediately after it has issued from a cooling device; the cooling device for the external cooling of the prim. tube comprises (I) an internal tube of sintered porous material (1) having inner dia. 2-300 cm. wall thickness 1-10mm, and pore distances of 5-200 m mu; (II) a jacket (2) snugly fitting the (1) - except the bottom part thereof - which serves to receive a liq. cooling medium; and (III) a channel (3) to receive a liq. lubricant, the (3) surrounding the (1) at its bottom section and being connected with it. The cooling device as claimed is of rel. simple design and affords trouble-free operation.