SU121891A1 - High-frequency apparatus for welding plastic films - Google Patents

Description

The known high-frequency apparatus for welding plastic films in the formation of the last (final) seam in plastic covers used for the hermetic packaging of products consists of a portable high-frequency generator with a power supply and an out-of-pocket manual working tool equipped with two electrodes forming an electric capacitor with the materials to be welded and connected to the generator at the end of the flexible cable. The proposed apparatus differs from the known ones in that the working tool is made in the form of tongs with clamp-shaped (curved at the ends) electrodes and adapted to clamp the material to be welded between them, attached to the tongs of the tongs. Such an execution of the working tool allows welding the last (final) groove of plastic covers with the intersection of adjacent seams to create a tight seal for the package, regardless of the dimensions of the products.

The drawing shows a working tool for the proposed apparatus in two projections.

The proposed unit consists of a high-frequency generator mounted in a perechny box with a power supply unit and remote manual welding tongs with hook-shaped (bent at the ends) electrodes 1 - l 2 attached to jaw lips. The clamp is connected to the generator with a flexible high-frequency feeder 3 and is equipped with a button mounted on the handle and connected to the control circuit with a flexible wire.

The pressure on the jaws is offered through a system of two levers 4 fitted with plastic handles 5.

The electrodes are made in the form of brackets so that when joining successively placed segments of the seam line,

No. 121891

intersected to create a completely sealed package. Optionally, the ends of the brackets meleno bend.

To signal the presence of high-frequency voltage ticks on the electrodes on the upper jaw / neon light 6 is installed.

During the welding process, due to a sharp change in the electrical parameters of the system, the light bulb 6 either fades or stops burning. This indicates the end of the welding process. For convenience of welding production, the control button 7 is introduced on the handle 5, with which, with a pre-prepared generator, the operator himself can start and end the welding process at the right time.

The control button with the help of a flexible wire 8 is included in the primary circuit of the anode transformer of the generator and provides switching on and off of the anode voltage on the generator lamp, and therefore, the supply or removal of high-frequency voltage from the electrodes.

Due to the fact that the strength of the seam at a given thickness of plastic depends on the size of the final thickness of the welded seam, the design of the tongs provides for adjustment of the gap between the electrodes using a special adjustment screw 9.

Subject invention

Claims (2)

1. High-frequency apparatus for welding plastic films, mainly in the formation of the last (final) seam in plastic covers used for hermetic packaging of products, consisting of a portable high-frequency generator with a power supply unit and an external manual working tool equipped with two electrodes forming with the material to be welded electrical capacitor and connected to the generator with a flexible cable, distinguished by the fact that the working tool is made in the form of pliers with a clamp These electrodes (curved at the ends), attached to the jaws of the tongs and adapted to clamp the material to be welded between them. 2. In the apparatus according to claim 1, use a button mounted on the handle of the tongs and used to control the welding process along a flexible wire connecting this button to the power supply.