DE1030485B - Electrode arrangement of a high-frequency welding machine intended for welding plastic foil packs - Google Patents

Description

Electrode arrangement for welding transparent packs Plastic film specific high-frequency welding machine The welding of from Plastics, such as acetate foils, in existing transparent packaging is often based on high-frequency technology Paths carried out. So is in such a device for welding Kunstfolien uses a welding machine, which has two holding bodies, one of which one of which is an electrode that works together with an adjustable counter electrode and the other is made of a material with good dielectric properties consists. Since both electrodes are each an unchangeable part of the construction form, it is as soon as boxes of different types with such a welding machine Size to be welded, it is necessary to go through the entire electrode assembly to replace a different electrode arrangement corresponding to the selected box size. However, given the large number of by no means standardized box sizes, it is inexpedient and economically unsustainable to match one of such a wide variety of box sizes Keep number of electrode assemblies in stock. Such welding machines therefore require one for the welding of transparent packages of different sizes considerable effort.

It is also a welding machine for welding transparent packages known, in which there is probably an adjustability of electrodes to one another. Here, however, the arrangement is made such that the welding machine has two has special high-frequency generators each with a pair of electrodes, the Generators with their pairs of electrodes are mutually adjustable. Apart from that that the use of two high-frequency generators makes the machine very expensive, This electrode arrangement also by no means readily guarantees the welding of visual packs of various sizes. There are special aids for this required, namely the use of the different box sizes corresponding blocks with counter electrodes are necessary, which are therefore also in a must be present in large numbers, since, as already stated above, the Market box sizes of any size are required.

The invention relates to an electrode arrangement for a the welding of plastic packaging such as acetate foils and the like. certain high-frequency welding machine in which the upper plate-shaped electrode compared to the lower electrode serving as a support for the material to be welded is adjustable. It makes itself the task of the disadvantages mentioned above to eliminate, in particular, to create a welding machine that is easy in its Construction is and the Sealing of transparent packs of all sizes is more economical Way allows.

According to the invention this is achieved in that the lower electrode has two welding bars which are adjustable in their spacing, the welding bars at the same time the supports of the seam edges to be welded on both sides of the transparent pack form.

According to one embodiment of the invention, the welding bars arranged independently adjustable, interrupted by a recess and be connected with a cross bar.

According to a further embodiment of the invention is expedient each of the two sealing bars on a transversely adjustable support interchangeable attached. Here horizontal support arms with a number of threaded holes for the optional attachment of perforated sealing bars of various Length to be provided. The carrier with the sealing bars can also have the from the base plate of the welding machine limited base area also arranged protruding will. The base plate of the welding machine can be larger towards the operator side Have cutout.

The adjustment of the carrier carrying the sealing bars can be achieved by means of a spindle arrangement.

The spindle arrangement can, for example, have two spindles, of which by means of a handwheel arranged on one side one carrier and through the other by means of one arranged on the other side Handwheel the second Carrier can be adjusted, the adjustment of the two carriers is carried out independently of one another.

A pressure plate with D, for example, serves as the upper electrode three-point adjustment. This pressure plate can be used to hold the to the packaging have lateral grooves that can be welded on.

In the drawing, FIGS. 1 and 2 show two exemplary embodiments of the invention shown. The differences are shown below on the basis of these illustrations and advantages of the electrode arrangement according to the invention over the known ones Arrangements explained in more detail.

Fig. I shows a high-frequency welding machine in which the Bearing plates 2, 3 attached to the base plate 1 have two guide axles 4, 5 arranged are, on which carriers 6, 7 sit transversely. This adjustability of the Carrier 6, 7 is reached by two spindles 8, 9, which are also in the bearing plates 2, 3 are arranged and adjusted independently of one another by means of the handwheels 10, 11 can be.

On the horizontal arms 12, 13 of the carrier 6, 7 are each a sealing bar 14 and 15 fastened by means of screw bolts, which pass through holes 16 of the sealing strips grip and can be screwed into threaded holes in the support arms 12, 13.

The pneumatically operated, guided in the head 17 of the machine arm 18 Piston 19 carries a pressure plate assembly 20 which forms the upper electrode for precise parallel adjustment with respect to the welding bars 14, 15 with a Three-point adjustment is provided.

The machine is easy to set up and operate. To a box 22 to produce a certain size, you only need two welding bars 14, 15 to screw on the welding arms 12, 13, the lengths of which correspond to the depth of the box 22 match.

Replacing the sweat 14, 15 is easy here only takes a few minutes. After attaching the welding strips 14, 15 is through the two handwheels 1Q, 11, the distance between the two welding bars 14, 15 is precisely set. The length of the box 22 is irrelevant here. The pre-folded box 22 is now placed over the welding bars 14, 15 and pressed firmly by hand, so that it sits neatly.

The welding press is activated by a foot contact (not shown) set in motion. When the foot contact is actuated, a is also not shown Solenoid valve switched on the compressed air. The head plate 20 then moves down and first of all presses the xlapping edges of the box 22 firmly together. Fractions seconds later, the required pressure on piston 19- is reached.

Thereupon a pneumatic switch is actuated, the high frequency current switches on After the welding time set by means of a timer has elapsed the high-frequency current automatically switched off again, whereupon the press too is opened so that the box 22 is removed and on the opposite one Side can be welded.

When making a different box size, it is only necessary to according to the width of the box, the distance between the two welding strips 14, 15 by turning the two land wheels lQ; to change t1, with changing ati Depth the sealing bars 14, 15 can be replaced. To the required higher High frequency resistance to compensate for the welding of the acetate against RVC is it of course. easily possible. interrupted Sclsweißleistee, so Sealing bars with cutouts, to use, making the box at single points or short Stretch is welded.

The high frequency voltage is applied to the upper plate 2O, so that the Operator when touching the lower welding arms 14, 15 no injuries can suffer. Of course, as with other electrodes, you can use the upper pressure plate 20 attach a light stick that lights up as soon as the plate 20 is under tension. It is also possible for the plate 20 a Provide protection against accidental contact.

The exchangeable sealing bars 14, 15 are simple brass rails with holes for mounting screws. The welding arms 12, 13 have a row of threaded holes that make it possible to use practically any bar length with multiple Securely fasten screws. On the front of the welding arms are also threaded holes.

These are used to attach a crossbar for the implementation of U-welds. However, this is only necessary if the side panels of the box are not punched from one piece with the rest of the part, but are put on have to. In such a case, this cross bar must be replaced for each box width will.

The required welding time is built in in a known manner on a automatic timer and remains roughly constant with each weld. The air pressure can also be set precisely. He is then during each Welds independent of the behavior of the operator. This machine is suitable can also be used for films other than acetate, for example PVC films.

The welding can be done with or without underlay material. If documents are necessary, they will be attached to the upper Andruclç plate.

There are lateral grooves on the pressure plate to hold the documents intended.

In order to be able to weld boxes of any length, as shown in Fig. 1 the base plate f of the welding machine is provided with a larger recess 23.

It is therefore not a misshapen press with a very large throat more required, but you can the box 22 through the cutout 23 of the Let the base plate 1 hang down, so that even boxes of more than 1 m Length can be welded. The arrangement also offers the same possibility according to Fig. 2, which differs from that according to Fig-. 1 differs only in that the carrier arrrre6, 7 of the welding bars 14, 15 lie outside the boundary surface of the base plate 1.

With simultaneous welding of the two sides of the box on the sealing bars boxes can be made up to a size that corresponds to the greatest distance between the sealing bars Width can be used. However, boxes of any width can also be welded, if you weld each edge individually by: first moving the boxes to the right and then shifts to the left. You can also weld round cans. Here You need a welding arm, with the other, second welding arm pushed towards the soap will.

The electrode arrangement according to the invention differs from the usual welding machines primarily by not using them by means of an electrode attached to the pressure piston is welded to the base plate, but that instead of the base plate, two narrow, transversely adjustable arrere after protrude in front, on which every viable hollow body after appropriate Adjustment of the welding arms for welding can be attached. This arrangement makes it possible to weld packs of various sizes and types. Man In addition to welding acetate boxes, it can also weld other containers make of plastic foils with this arrangement.

The sealing bars, which can be exchanged on the carriers, are used for Welding of rectangular boxes of any size, no special core pieces more is needed, the dimensions of which would have to be based on the size of the box. It is only necessary to use the welding arms attached to the machine to be adjusted accordingly and pushed onto these welding arms. The adjustment is done here by two spindles, which are adjusted by means of a small handwheel can be. Such an arrangement is due to the relatively cheap, Easy to manufacture replaceable brass strips screwed to the support arms.

An advantage of this electrode arrangement is that the welding arms not only replace the inner core, but also wear the electrodes at the same time, like that that a special electrode does not have to be made for each box size.

Furthermore, the sealing bars grip when welding the box inside, while the upper smooth plate presses on the outside of the box.

When welding, the sealing bars are pressed into the material. If you weld from the outside in the usual way, you get on the outside a groove in the box. However, this groove forms a dirt trap, which is undesirable is. In contrast, the welding bars engage in the electrode arrangement according to the invention from below. As a result, the weld seam is created on the underside of the box edge. The counter-plate is pressed on from the top, so that the outer surfaces the box remain perfectly smooth, so the weld is hardly noticeable.

With this electrode arrangement, the box needs to overlap only to be a little wider than the weld itself while you're gluing one Seam must make the overlap about 1 cm wide. It also saves film.

Another advantage is that with precisely adjusted welding arms the attached sealing bars also serve as a template to which the pre-folded The box is placed by hand from the right and left, causing it to slip the box is bent forward while welding.

PATENT CLAIM 1. Electrode arrangement for welding Transparent packaging made of plastics, such as acetate foils and the like, certain high-frequency welding machines, in which an upper plate-shaped electrode is opposite to one that cooperates with it lower electrode serving as a support for the material to be welded adjustable is, characterized in that the lower electrode has two adjustable spacing having parallel sealing bars (14, 15), the sealing bars at the same time form the supports of the seam edges of the packaging that are to be welded on both sides.

Claims (1)

2. Electrode arrangement according to claim 1, characterized in that the sealing bars (14, 15) are interrupted by cutouts. 3. Electrode arrangement according to claim 1, characterized in that a cross bar is connected to the two welding bars (14, 15) of the lower electrode is that this forms a U-shaped electrode with the two welding strips. 4. Electrode arrangement according to claim 1, characterized in that each of the two welding bars (14, 15) of the lower electrode on a transversely adjustable Carrier (6, 7) is attached replaceably. 5. Electrode arrangement according to claim 4, characterized in that horizontal support arms (12, 13) a number of threaded holes for optional attachment of welding strips (14, 15) provided with holes (16) of different lengths. 6. Electrode arrangement according to claim 4, characterized in that the carrier (6, 7) with the welding bars (14, 15) are arranged in such a way that they protrude beyond the base area delimited by the base plate (1) of the welding machine. 7. Electrode arrangement according to claim 4, characterized in that the base plate (1) of the welding machine towards the operator side has a larger section (23). 8. Electrode arrangement according to claim 3, characterized in that the carriers (6, 7) are guided on guide rods (4, 5) and by means of a spindle arrangement are adjustable. 9. Electrode arrangement according to claim 8, characterized in that the spindle arrangement has two spindles (8, 9), one of which by means of a handwheel (10) arranged on one side of a carrier (6) and through the other by means of a handwheel (11) arranged on the other side, the second Carrier (7) is adjustable, the adjustment of the two carriers (6, 7) independently from each other. 10. Electrode arrangement according to claim 1, characterized in that that the upper electrode has a pressure plate (20) with three-point adjustment. 11. Electrode arrangement according to claim 10, characterized in that that the pressure plate (20) has lateral grooves for holding it in the packaging weldable documents. ~~~~~~~~~ Publications considered: German Patent No. 829 034; British Patent No. 670 808.