DE1900953U - DEVICE FOR SEALING CONTAINERS BY USING A HEAT-SHRINKABLE PLASTIC FILM. - Google Patents

Description

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899 Lindau (Lake Constance) Rennerle 10

6. 7. 64

Adolf Schnydrig Frutigen (Canton of Bern,

Switzerland)

Device for closing containers by means of a heat-shrinkable Plastic film

In the packaging industry, bags made of more or less transparent plastic film "are known, which after filling the goods automatically

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be locked. There are two basic types of bag production in particular Use. The first, older type uses a flat sheet of plastic to double the length of the cut off the finished bag and spread it flat. The goods to be packaged will then open onto the cut piece of plastic film then put one half of this cut piece over the goods so that, from the fold starting out, the three end parts of the envelope including the goods on the end parts of the flat plastic piece come to rest. Then a vertical downwardly moving hold-downs these Eandpartien with or without the action of heat or using an adhesive is pressed together, thereby forming a sealed pouch. Especially with small individual items, e.g. B. Medicines in pill form, also find two parallel running plastic webs application, between which the individual pieces at a distance are placed side by side, with a four-sided hold-down device for each individual item to form the bag Is used.

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This type of packaging is particularly suitable for bulk goods or individual items such as "described, d. H. goods that can be piled up on one level. she is but not suitable for goods with a more or less liquid consistency. For these goods The second type of bag production is used, in which an endless tube is made Plastic is brought in vertically and cut to the length of the bag. The lower The end of the same is welded shut by pressing two tumblers moved horizontally towards one another or glued; The more or less liquid goods are filled into the resulting sack and thereupon the bag is also closed at the upper end by means of two of the tumblers described. If the upper tumblers are rotated by 90 degrees compared to the lower ones, the bag is created well-known tetrahedron.

For some time now, aluminum foil containers have also been used for packing goods, closed on three sides by the container wall, covered from above with a plastic film will. So z. B. for packaging cakes, pre-cooked whole meals, etc.,

"with which partially the filled goods" already Pre-cooked or ready-cooked in an open aluminum container "or is baked. The encrypted one The transparent plastic film forming this container has the property under action from heat to shrink, causing the top of these containers, similar to an eardrum, is taut and therefore tight. These thus sealed aluminum containers generally have an upper, outwardly protruding edge that extends over the circumference of the vessel, d. H. at least about the circumference of the neck of the vessel, protruding and on which the top cover is held in place.

The present innovation relates to a device for closing such containers by means of a heat-shrinkable Plastic film, with one to press the Plastic film on the container to be closed, overlapping the container edge, vertically displaceable hold-down device.

With the innovation is a structurally relatively simple device with a few individual parts

maschine11en sealing of the containers described created that can be manufactured economically and is suitable for both manual and semi-automatic or fully automatic actuation.

According to the innovation, this device is characterized in that coaxially below the Hold-down a horizontal, the container centering support plate is arranged for this, below which there is a cavity for the supply of a fan and a heating device generated hot air is located and that on the circumference of the support plate, leading out of the cavity, with their mouths on the Eandpartie of the container directed channels are provided so that, with the container placed on the plate and with a plastic film inserted between it and the hold-down device, by actuating the device, the hold-down device, to press the plastic film onto the Container edge, is moved downwards, in which position the hot air flow through exit from the channels the shrinking of the protruding plastic film rim section below the container rim

Applying to the same "causes and thereby, a tight closure of the container and a firm connection of the plastic film to the container is achieved, whereupon the hold-down device moves away from the closed container into its starting position moved upwards.

Three embodiments of the device according to the innovation are shown in the drawing. Bs shows:

Figure 1 is a diagrammatic representation of the

Device according to the first version with partially cut hold-down device,

FIG. 2 shows a vertical section through the work table and hold-down device of the device according to Fig. 1, drawn on a larger scale,

FIG. 3 more schematically shows a vertical section through a device according to the second Version with hydraulically operated

Hold-down and

Figure 4- a vertical section through the device according to the third version with a hold-down device "fastened on one side".

The device shown in Figs. 1 and 2 for Closing of containers by means of a plastic film which shrinks under the action of heat " a box-shaped stand 1 having table height and a horizontal table top on its top 2 carries. In a circular section of this table top 2 is a plan view of the shape the cutout adapted, horizontal plate 3 is used. The same has one on its underside axial guide pin 4-, which is in a guide bush 5 protrudes, the front side on a spaced parallel to the table top, below the same, in the stand 1 fixed base plate 6 is supported. The plate 3 is with its guide pin 4 in the Bush 5 guided vertically within certain limits. One to the sleeve 5 coaxial between the plate 3 and the base plate 6 inserted compression spring 7 holds the plate 3 in their

upper starting position, in which a conical collar arranged on the outer circumference of the plate 3 ^ a. keeps the circular cutout in the table top 2 closed. At the same time, the above-mentioned collar 3a serves as an end stop for the plate 3 in the direction of force of the leather 7. The top of the plate 3 carries a centering plate 9 that is adapted to the outline of the bottom surface of the container 8 to be closed on it.

The below the platen 3 between the Base plate 6 and the table top 2 lying tree is represented by a vertical circular ring 10 delimited, while outside this ring 10 between the table and the base plate thermal insulation material 1 introduced isfi. On the underside of the base plate 6 is a centrifugal fan 12 attached, the conveyed air through slots 13 in the limited by the ring 10 Eaum is guided in which an electrical heating device 14 is located. Besides that is there 3? coaxial, one in the shape of a downward tapering one

Conical air guide plate 15 "attached.

Parallel to the axis of the support plate 3 are, laterally of the same, one each, running through the table and the base plate, two guide columns 16 in guide bushes 1? vertically displaceably guided whose upper ends are jointly a located above the table top 2 horizontal top plate 18, on the underside, coaxially with the platen 3 ₅ a horizontal pressure plate 20 is fixed as a holding-down device via an intermediate ring 19th This named pressure plate 20 is provided on its underside with a recess 20a corresponding to the outline of the upper edge of the container 8 to be closed. The lower ends of the guide column 16 are connected via articulated rods 21 to the intermediate gear 2J, which has a foot lever 22, for actuating the device.

Viewed from the front of the device, behind the support plate 3, parallel to the through both guide columns 16 extending vertical plane,

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is on the table top 2 a holder 24 formed from two rollers for supporting the in the form a roll 25a of the stock stacked to Closing the container 8 required shrinkable plastic film 25 arranged. A cutting device is also located between this holder 24 and the support plate 3 for cutting the film web into individual pieces, for closing the containers 8 needed pieces. This cutting device is formed by one below that of the supply roll 25a running film web 25 horizontally rectilinear stretched through, electrically heatable resistance wire 26 and a higher lying Guide roller 27, under which the latter the film web is passed.

For the sake of clarity, the head plate 18 is drawn upward in FIG. 1, its real upper band position is indicated by 18 'and dash-dotted lines. Likewise is the Bracket 24 and the cutting device 26, slightly enlarged and with a greater distance from the platen 3 is drawn away as this

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in reality is the case. The real proportions are z. Part of FIG. 2 can be seen.

The operation and mode of operation of the device shown and "described in FIGS. 1 and 2" is the following:

To start up the device, the fan 12, the heating device 14 and the heating wire are required 26 to be switched on. The free end of the shrinkable plastic film 25 is under the roller passed through and is at the level of the heating wire 26. The container to be closed 8, engaging with its bottom in the recess of the centering ring 9, on the support plate placed, then the plastic film 25 so far pulled out to the front so that it protrudes slightly on all sides over the upper edge of the container 8. By stepping down the pedal 22, the head plate 18 and with it the pressure plate 20 moved downwards. Here, the pressure plate 20 first takes the plastic film 25 downwards, the this comes to rest on the heating wire 26, which the latter thereby by means of fusion cut

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separates the piece lying above the container from the supply web. At the same time this cut piece plastic film is printed on the edge of the container 8, and, taken in moving further down Zopfplatte, the container 8 together with the platen 3 ₅ against the force of the spring 7 downward. By pressing down the support plate 3 as described, its collar 3a, which acts as a valve in cooperation with the edge portion of the cutout in the table top 2, is removed from its seat, creating an annular gap around the support plate 3. Through this annular channel, the air, which is printed by the fan 12 through the slots 13 in the space bounded by the Hing 10 and there is strongly heated by the heating device 14, is guided to the underside of the pressure plate 20, where it hits the portion of the plastic film protruding over the container edge 25 hits. This action of heat causes the said edge portion to shrink, which in the process rests against the edge of the container 8 from below and thereby forms a firm connection between the latter and the plastic film covering it, which

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a tight closure of the container 8 results.

After releasing the pedal 22 causes a behind the axis of rotation of the pedal 22 on the same arranged balance weight 28 the return of the head plate 18 in its upper starting position 18 ', in which the support plate 3 by the force of the spring 7 in its upper, in Fig. 2 drawn end position is brought, in which the collar 3a the outlet channel described keep closed again for the hot air. After removing the now closed container 8 and Placing a new, unlocked container on the support plate 3? the closing process is repeated on the new container as described.

The gate direction shown in Fig. 3 for locking of containers works as opposed to that in the Pig. 1 and 2 shown and described mechanical device, hydraulic. The stand intended to be placed on a table is denoted by 101, in which two vertical guide columns 116 are fixedly arranged and upwards are guided out of the table top 102. The Andes

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The horizontal head plate 118 attached to the top of these columns 116 is also fixed and serves to support a hydraulic cylinder 29, the piston of which acts on the pressure plate 120, the latter being guided vertically on the columns 116 by means of a slide 30. The support plate 103 for the container 8 to be closed is held conically on its outer circumference and also acts here as a valve body in connection with the conically arranged limiting ring 110 for the interior space delimited by the latter for processing the hot air. The air is supplied here by means of an axial fan 112. The sleeve 104, which is fastened to the underside of the support plate 103 and protrudes axially, corresponds to the pin 4- in I ¹ Xg. 2. The parts 5-7, 11, 13 and 14- are with the same named parts in S ¹ Xg. 2 are identical and their punctures are the same as described there.

The pressure plate 120, however, is here as a cutting punch and the table top 102 as Cutting die formed while the arrangement of the support plate 103 in relation to the cutout

is made in the table top 102 such that the upper edge of the container 8, at the plate 105 lying on the container, comes to lie below the table top level.

This design is used to close the container 8 between the latter and plastic film inserted into the pressing plate 120 25 when the slide 30 descends hydraulically through the now as a cutting punch effective pressure plate when passing the upper edge of the table top 102 on the desired Cut to shape and the closing process is basically the same as with the device according to FIGS. 1 and 2 described.

Instead of the straight heating wire 26 for cutting the plastic film 25, could the same can also be laid in a circle outside the outline of the container 8 or a different one Have shape.

In the device shown in Fig. 4- the box-shaped stand is designated 201,

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the upper end of which is formed by the horizontal table top 202. This owns an expediently circular cutout in which the support plate 203 for the to be closed container 8 is used interchangeably, its centering pin 204 in a corresponding fitting bore of a support cone 205, which is arranged coaxially in the stator 201, engages.

In the right half of Fig. 4 is a container 8a drawn with a large diameter and the associated support plate 203a, while the left half of the picture a container 8b with a smaller diameter and the associated support plate 203b shows. So that the support plate 2O3 "b, which is smaller in diameter, is inserted centrally in the table cutout can be, is on its circumference a circular ring with the table cutout adapted outer diameter attached. With this design, various container support plates can be placed in said table cutout Use for containers of different sizes as required.

On the outer circumference of the individual container support - 17 -

plate are a number evenly around the circumference distributed vertical bores 207 arranged, on the one hand in the through the stand enclosed cavity 201a, on the other hand to the outside, against the edge of the respective container directed, open. The lower end of this cavity 201a is through a bottom flange formed, to which a radial fan 209 for generating an air flow is flanged on the outside on the left is. An electric heater 210 is installed inside the cavity 201a, the is used to heat the air mass guided through the cavity 201a.

In the table 202 and stand 201 there is a single column on one side of the table cutout in 3? ig. 1 and 2 analogue guide pillar 216 vertical mounted displaceably, at its upper end a circular, coaxial to the device and support plate axis arranged hold-down device 220 is held on one side and exchangeably. The clear diameter of this hold-down is included little larger than the outer diameter of the edge bead of the container 8 and the vertical

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movement of the guide column 216 so "limited, that in its lowest position, the hold-down device 220 slightly follows the upper edge of the container 8 overlaps below. In the right half of the picture the Pig. 4 is again a hold-down device 220a, suitable for container 8a, and in the left half of the figure a hold-down device 220b, suitable for container 8b, is drawn. The type of attachment not shown on the Head of the guide column 216 makes it possible to have the right hold-down device for every container size on the To attach the guide column.

The aforementioned guide column 216 can be actuated by an electric motor, pneumatically or hydraulically or be carried out by a foot pedal, switching the fan on and off 209 and the heating device 210 take place automatically by the moving guide column 216 can. The feeding and trimming of the plastic film, which has not been drawn, can be carried out with this device also take place, as is enumerated for the other devices described.

To prevent hot air from rising,

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after the fan 209 is switched off and the fan is switched off Heater 210, at an undesirable point in time through channels 207, can be in the cavity 201a a closure flap designated by 211 in FIG. 4 be arranged, which allows the passage of hot air only in its open position. The control of this flap 211 is expediently synchronized with the hold-down device 220 executed.

This illustrated and described device according to lig. 4- is particularly suitable for expansion with automatic controls, so that they can be integrated into the flow of a Packaging line is insertable.

Protection claims

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Claims (8)

- 20- PJU84 5Ö8-3.16 * Protection claims 1. Device for closing containers by means of a heat-shrinkable Plastic film, with one for pressing the plastic film onto the container to be closed "certain, the edge of the container overlapping, vertically displaceable hold-down device, characterized in that that coaxially below the hold-down device (20 or 120 or 220) a horizontal one that centers the container Support plate (3 or 103 or 203) for this is arranged, below which there is a cavity (201) for the supply of by a fan (12 or 112 or 209) and a heating device (14 · or 210) generated hot air is and that on the circumference of the support plate (3 or 103 or 203) leading out of the cavity, with their mouths on the edge part of the container (8) directed channels (207) are provided, such that at on the plate (3 or 103 or 203) placed container (8) and between this and the hold-down (20 or 120 or 220) inserted plastic film (25), by actuating the device, the hold-down device, for pressing the plastic - 21 - films on the edge of the container, moved downwards
is the position in which the hot air flow through exit from the channels causes the shrinking of the protruding plastic film edge part below the container edge with abutments on the same and thereby a tight closure of the container and a firm connection of the plastic film to the container is achieved, whereupon the hold-down device is
away from the closed container, up to its starting position. 2. Device according to claim 1,
marked by
a support plate (5 or 103), which is held in its upper end position by means of spring force, is vertically displaceable and is designed as a valve for the channels leading from the cavity to the outside . 120) but is shifted downwards by this, against the spring force, to release the channels. - 22 - 3. Device according to one of claims 1 or 2, with plastic running off from a supply roll (25a) ilmbahn (25), characterized in that the cutting of the plastic film (25) by the downward movement of the hold-down device (20 or 120 or 220) takes place. 4. Device according to one of claims 1 to 3, characterized by one arranged outside the container outline at a distance below the plastic band (25) Heating wire (26), which causes the downward movement of the hold-down device (20 or 120 or 220) Separates the plastic band (25) which is placed on it by a fusion cut. 5. Device according to one of claims 1 to 3 * marked by a punching device for cutting the plastic film (25), its cutting punch on the underside of the hold-down device (120) and its cutting die (102) with its cutting plane above the container edge plane is arranged. 6. Apparatus according to claim. 1 and one of the Claims 3 "to 5, characterized in that the support plate (203) for the container (8) Stationary in the stand (201) of the device and exchangeably arranged and the hold-down device (220) is designed in the form of a circular ring which can be exchanged on one side on a guide column (216) and the channels (207) leading to the outside from the cavity (201a) are open. 7. Apparatus according to claim 6, characterized in that that within the cavity (201a), between the heating device (210 and the channels (207) a flap (211) which closes the former and which can be pivoted into an open position is arranged is. 8. Apparatus according to claim 6 or 7, characterized in that that the activation of the fan (209) and the heating device (210) automatically by the downward moving hold-down device (220) and its shutdown by the upward movement of this hold-down device.