CS252879B1 - Apparatus for manufacturing tubular thermoplastic films - Google Patents

Abstract

The purpose of the solution is a device for the production of tubular films from thermoplastics. The essence of the solution is the fact that by including a roller magazine and a film braking device between the take-off rollers and the winding device of a conventional device for the production of tubular films, more favorable conditions are created for handling mutually glued double-sided cut film when guiding the film onto separate reels. The device for the production of tubular films according to the present invention can be used for the production of special highly adhesive and super-thin films based on ethylene polymers and its copolymers.

Description

252879

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for producing bilaterally cut thermoplastic tubular films, wherein a cylindrical container and a braking device of a film are disposed between the withdrawal rolls and the winding device.

Previously known devices for making thermoplastic sheets are composed of an extruder with a round die, a guide of a folding sheet film, a draw-off roller and a winding device. inserted between the extruder and the tool. Further enhancement of the tubular film manufacturing equipment is achieved by increasing the cooling performance of the foil after exiting the crucible. Napr.v jap. pat. 5 2051 463, cooling efficiency is achieved by cooling the cooling air to a temperature of 0 to 10 ° C. In German Pat. No. 5,555,848, the cooling efficiency of the film is increased by a multi-stage internal brick which simultaneously stabilizes the film. Podlá jap.pat. 7,8008,339, a 2-stage external cooling is used to cool the balloon in the form of perforated cylinders of the diameter, through which the cooling air is directly blown by the film. NSR Pat. No. 2,647,555, the cooling efficiency of the film is achieved by the water-cooled rollers which are in contact with the film and which simultaneously provide the film. VNSR Pat. No. 2,658,518 discloses an improved apparatus for producing tubular films provided with automatic regulation of foil clearance. A disadvantage of these solutions is that these devices do not satisfy the production of special thick adhesive foils (for example, ethylene vinyl acetate copolymer stretch foils), which are cut off on both sides in the form of flat foils after the foil is drawn in the exhaust rollers. other two separate rolls. The ultra-sharp cutting of the foil is at the same time separate by the winding of the clippers. A major problem with the devices used to produce tubular plastic films, which have been used so far, is the necessity of quickly separating the glued-on tubular foil, which is glued on both sides of one another, and directing it onto 2 separate rollers in order to maintain the continuous production of the tubular film.

These drawbacks are eliminated by the device for producing tubular thermoplastic films, which consists in placing a roller foil reservoir and a foil device of the foil between the withdrawal rollers and the winding device of a conventional tubular film manufacturing apparatus. With the need to divide the bilaterally bonded double-faced film into two separate windings, the already cut tubular film is braked by the braking device before entering the winding device and the continuously produced film is deposited into the roller container. The roller tray consists of a set of fixed and movable rollers. The movable rivets are mounted in a traveling frame, which continues to fill the container by the foil produced by the guide rails. The weight of the drive is eliminated by the counterweight through the chain drive. In this way, depending on the speed of withdrawal of the tubular film produced and the capacity of the roller container, the necessary time is required to break the two-sided film to be bonded to each other and to the unrolled flat foils to the two-tier rolls. After the flat sheets have been guided onto two separate rolls, the foil braking device is released, the accumulated foil is gradually emptied out of the roller container and the roller container is out of order. The advantages are that they are. it improves aufahi handling with double-trimmed foil when guiding the retracting device, especially in the manufacture of special thick-film and super-thin foils. The roll-in roll can also be used to cool the film path, thereby improving the cooling of the film before entering the winding device and preventing possible blockage between the winding layers, caused by the insufficient cooling of the film. The accompanying drawing illustrates the arrangement of the apparatus for the manufacture of tubular thermoplastic films.

The apparatus comprises an extruder 1 with an extruding tool with a circular nozzle 3, a device for stabilizing the film 8 ', a folding dock 5, a withdrawal roller 7, a roller container 8, a cutting device 9, a braking device 10 and a winding device 11. For improving the quality of the film a continuous filtering filter 2 is provided between the extruder 1 and the extrusion tool with the circular hollow drum 3, which provides for the polymeric filtration of the polymer. The film stabilizing device 5 is a roll-type transfer to reduce the trailing of the contact surfaces of the film, thereby preventing the film from pulsating during manufacture.

After the film has been folded, the film is drawn off by the rubberized rollers 7 and the roller tray 8, which consists of a set of fixed and movable rollers 8a, 8b and is operated by the actuating mechanism of the rolling part of the roll The composite pre-brick film F through the cutting device 9, which is constituted by a set of knives, is adjusted through the lever mechanism. On the trimming device 9, the stacked film cuts the two-sided trimming of the foil to the desired size by winding the trimming reels 13 through the braking device 10 to the winding device 11. The braking device 10 consists of a fixed rubber roll and eccentrically positioned

Claims (1)

252879 push rubber ivalca, which is a control mechanism. If desired, especially when guiding the double-cut foil to two separate coils, the pressure rubber cylinder is pressed against the fixed cylinder to brake the film roll and at the same time the roller magazine is actuated, where the pile does not sustain the drawn folios. When the foil is stacked into the roller magazine, the time required for handling the separation of the double-cut foil and the foil feeding into two separate coils is obtained. The present invention is suitable for the production of super-light and special tubular films made of thermoplastics, for example, branched polyethylene, linear low-density polyethylene, ethylene dimethyl acetate copolymer and others. The device is advantageously used in the preparation of iv-ambient stretching foils in a base of ethylene-vinyl acetate copolymer and can be utilized with a film-up blowing technology upwards or top-down technology. OBJECT A device for producing tubular foil blowing technology from top to bottom, resipted from the top, characterized in that the intermediate draw rollers (7) and the winding device (11) of a conventional tulle film making machine are included in a rolling stock inventing nick (8) remaining from a set of fixed (8a) and movable rollers (8b), a braking device - a film (10) consisting of a rigid rubber roll (10a), a presser bar (10b) and a cutter winder (13). 1 sheet of drawings