VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG VON IN ZWEI RICHTUNGEN ORIENTIERTEN, WAERMESCHRUMPFENDEN SCHLAUCHFOLIEN

• Main Authors: LAKNER ENDRE, SZAKOS IMRE, DOBO JANOS, PARICSI ZOLTAN, KEREKES BELA, MISKOLCZY LASZLO, MADAI GYULA, CVIKOVZSKY TIBOR, KALMAN IVAN
• Format: Patent
• Language: German
• Published: 10.02.1989
• Edition: 4
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; PERFORMING OPERATIONS; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

In the process hose (1) extruded from polyethylene or ethylene copolymer, then reticulated, is led through a liquid bath (2), the temperature of which is approximately the same as the crystalline melting point of the hose material. An air bubble is blown from the hose emerging from the bath between two pairs of closing rolls (3, 7) and, during continuous expansion of the bubble, the extent of the expansion is controlled with deformation elements (10) arranged parallel or at variable angle to the direction of progress of the hose, the size of the bubble representing 50-500% longitudinal and transverse expansion in relation to the unexpanded hose. The hose is then passed via baffle plates (6) to the second pair of rolls (7). The apparatus enables increased safety and improved dimensional stability.