Flattening and haul-off apparatus for the blow moulding of a plastic tubular film

• Main Author: ACHELPOHL, FRITZ, GRAD
• Format: Patent
• Language: English; French; German
• Published: 11.05.1994
• Edition: 5
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CONVEYING; HANDLING THIN OR FILAMENTARY MATERIAL; HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; PACKING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; STORING; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A flattening and haul-off apparatus for a plastic tubular film blow-moulded from a fixed film blowing head has flattening plates and pinch rolls which can be swivelled reversibly about the axis of the fed-in film tube and is provided with a downstream fixed winding or further-processing apparatus and with a radially outer deflection roll, parallel to the pinch rolls and reversing with them, as well as a radially inner reversing rod, by means of which the tubular film is guided between the pinch rolls and the winding or further-processing apparatus or a fixed deflection roll feeding the tubular film to the latter and which lie in planes parallel to the swivelling plane of the pinch rolls. The distance of the deflection roll from the pivoting axis is greater in every possible swivelling position than the distance of the part wrapped around by the film of the reversing rod swivel-mounted close to the swivelling axis from the said axis. The swivelling movement of the reversing rod is only half as great as that of the deflection roll. To be able to increase the diameter of the reversing rod as much as desired, without thereby hindering or hampering the drawing-in of the flattened tubular film when setting up the apparatus, the pinch rolls (30) with the deflection roll (28, 29) on the one hand and the reversing rod (16) on the other hand are mounted on shafts or spindles with mutually aligned centre lines in a supporting frame (5) or the like. The supporting frame (5) has between the mountings a recess in the region of the reversing-rod swivelling plane, which passes through the centre line.