SU1744019A1 - Arrangement for laterally joining ends of coiled material - Google Patents

Abstract

The invention relates to the processing of elastic bands, in particular to cross-splicing units UG-loten roll thermoplastic material or composite material with a thermoplastic coating, and allows you to increase productivity and simplify the design. The device contains a welding unit and guide rollers. The feed rollers are in contact with the guide rollers in the working position on the body of the welding unit, and channels for exhaust of air to the splicing zone are located on the radiating surface of the welding unit. 2 Il.

Description

The invention relates to the processing of elastic tapes, namely, the cross-splicing units of webbed thermoplastic material or thermoplastic composite material.

A device for welding thermoplastic film bags is known, comprising a film feeding device, a movable heater and a pressing device.

A disadvantage of the known device is that in order to dock the end of the developed and start a new roll, it is necessary to stop the device to fill the free end of the new roll, which requires for the organization of a continuous technological process the use of compensators, which significantly complicate the design.

The aim of the invention is to increase productivity and simplify the design.

This goal is achieved by the fact that in a device for cross-splicing the ends of material rolls containing a movable welding unit, pressing and feed rollers, feed rollers are mounted on the welding unit body opposite the pressing rollers for contacting the pressing rollers in the working position of the welding unit.

FIG. 1 shows the device in the off position, side view; FIG. 2 - the device in the working position, side view.

The device contains unwinding units 1, between which the pressing machine D is located.

4 4

with

3

The driving rollers 2, the movable welding unit 3, on the radiating surface of which between the heating elements h (for example, tenami) are the air ducts 5, and the feed rollers 6 are fixed on the body, the electric drive 7 is connected with the feeding rollers 6, which are in the working position of the welding unit 3 are in contact with the pressing rollers 2 (Lig.1 and 2)

The device works as follows.

When unwinding a thermoplastic material, the roll is mounted on one of the unwinding units 1, the welding unit 3 is in the initial position (Fig. 1), while the feed rollers 6 do not contact the pressing rollers 2, which are rotated by the scaling forces with the moving material, ensuring free access to the splice zone. The drive 7 feed rollers 6 is turned off.

While the produced roll is being consumed, a free unwind unit 1 is installed on a new roll of thermoplastic material, and its beginning is placed on a free pressing roller 2 so that it overlaps the contact line of the feed roller 6 and this pressing roller 2, as shown in FIG. At the same time, a new roll of thermoplastic material will not unwind due to low adhesion forces with its guide roller 2. At the time of the end of the produced roll (Fig. 2), according to the signal of the roll end sensor (not shown, the actuator 7 is turned on and air is flowing in The housing of the welding unit 3, which is supplied (for example, by a hydraulic cylinder) to the pressing rollers 2, occupies its working position. The feed rollers 6 in the working position press the end of the produced and the beginning of a new thermoplastic coil about the material to the pressing rollers and feed them into the splicing zone at a predetermined speed corresponding to the welding speed.

0

heating elements h of the welding unit 3. The thermoplastic material passes under the radiating surface of the welding unit 3 and heats up the air heated in the welding unit 3, through the channels 5 in the radiating surface into the splicing zone, presses the material to the surface of the pressing rollers 2, preventing wrinkling. The passage between the pressing rollers 2, the heated end of the produced and the beginning of the new roll is passed by them, forming a weld. At the end of the splicing operation, the welding unit 3 occupies the initial position (for example, at the operator's command) and the cycle repeats.

Based on the frequency of the docking operations and the inertial properties of the heating elements, the latter may not be turned off. If the unwinding speed of a roll of thermoplastic material

5 is greater than the splicing speed of the rolls, then it is necessary to use a small compensator (any of the known ones) after the splicing device.

0 Such a design in case of coincidence of the speeds of the main technological mode with the mode of splicing will allow the main technological process to be conducted continuously, and in the case of

 mismatch dramatically reduce the time for the docking operation, and hence the size of compensators,

Claims (1)

Invention Formula A device for transverse splicing of the ends of the material rolls, containing a movable welding unit, pressing and feed rollers, which, in order to increase productivity and simplify the design, feed rollers are mounted on the body of the welding unit opposite the pressing rollers for contact with the pressing rollers in working position of the welding unit. g 610ML