SU1118535A1 - Device for thermal-pulse sealing of polymeric films - Google Patents

Abstract

A DEVICE FOR THERMO-PULSE WELDING OF POLYMERIC FILMS, containing a housing with a thermal insulation strip, a tape heater, and an elastic anti-adhesive strip, forming a gap with a heater, which means that if you use a device with a heater, it will wear a gap, with a heater, a cross-section of a device with a heater, a grid of a device, a gap, with a heater, a gap buffer tank filled with gas. sl with eo U1: about: l

Description

I

The invention relates to the welding of plastics, in particular to devices for welding films, and can be applied in the machine-building, instrument-making and other industries.

A device for thermopulse welding of thermoplastic plaster is known, comprising a welding plate on which an insulating anti-adhesion gasket is placed with a heating element disposed in it with a gap mounted on stretches ij

A disadvantage of this device is that in the course of work, there is frequent contact between the adhesive strip and the heating tape, causing rapid burnout of the working portion of the gasket, which degrades the quality of the weld, violates the tightness of the package and reduces its quality. In addition, frequent gasket changes reduce the performance and reliability of the welding device.

Closest to the proposed technical essence and the achieved result is a device for thermopulse welding of polymer films, comprising a housing. on which a thermal insulating gasket, a tape heater and an elastic anti-adhesive gasket forming a gap with a heater 2 are fastened.

In the known device, a heating element, in the form of a tape, is installed inside the gasket with a gap which is eliminated during the welding process. Since the gap communicates with the atmosphere, its secondary occurrence is due to the elastic properties of the gasket. With repeated repetition of welding cycles, the elastic properties may disappear and the heater remains in contact with the gasket, which leads to rapid burnout of the latter.

The purpose of the invention is to increase the reliability of the device.

This goal is achieved by the fact that in the device for thermal impulse welding of polymer films, comprising a case on which heat is fixed, an insulating gasket, a tape heater and an elastic

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The anti-adhesive gasket, which forms a gap with a heater, is elastic. The anti-adhesive gasket is made in the form of a sealed buffer container 5 filled with gas.

Such an embodiment of the device makes it possible to increase the reliability of its operation, since in it the elastic properties of the gasket are provided

10 the material from which it is made is manufactured, and in addition to this, the gas is in a closed buffer tank. The drawing schematically depicts the proposed device for thermopulse welding of polymer films, a section.,

A device for thermopulse welding of polymer films contains

20 housing 1, on which a thermal heater 3 is fixed on the thermal insulating gasket 2, which is in a closed hermetic volume formed by an elastic anti-adhesive gasket 4 spaced 13 mm from the working part of the heater and fixed on the body with clamps 5. Elastic anti-adhesive gasket 4 is made in the form of a her30 amict buffer tank b, filled with gas, for example, air. Buffer container 6 communicates with a gap 7 between the release liner 4 and the tape heater 3. The recommended material for laying the PTFE heater is nichrom.

The device works as follows.

Weldable films (not shown)

placed between the release liners and bring them into tight contact. In this case, the anti-adhesive gasket 4, without breaking the tightness and deforming, chooses a gap 7

 before the tape heater 3, comes into close contact with the latter and by heat transfer and the force transmitted through the housing 1 and the current set time, welding is carried out

 films. At the same time, the air from the gap 7 is squeezed into the container 6. At the end of welding, the contact between the obtained weld and the welding unit is terminated. At the same time anti-adhesive

55 laying, exit from contact with

welded by a seam due to the forces of elastic deformation and increasing the air pressure in the buffer tank 6 and 3111185354

Dore 7, comes out of contact with the heating strip, which increases the reliability of the neck 3 and forms a working-lateral clearance of 1-3 mm from the device’s operation. Thus, the seam and, accordingly, the quality of the burnout of the adhesive packaging.

Claims (1)

DEVICE FOR THERMAL PULSE WELDING OF POLYMER FILMS, comprising a housing on which a heat-insulating gasket, a tape heater and an elastic release liner are formed, forming a gap with a heater, characterized in that, in order to increase the reliability of the device, the elastic release liner is made in the form of a tight buffer containers filled with gas.