DE2342194A1 - CONTAINERS FOR PACKAGING OR FILLING MEDIA OR LIQUIDS SUBJECT TO SUPERATMOSPHERIC PRESSURE - Google Patents

Description

AMV..V.TE

DIPL ■ I Γ.'GH Γ, OHR
DIPL-IKG. P. 3 ^T Ar-GER

8 MUNICH 5
MÖLLERSTRASSE 31

2 ί. Ϊλΐ3. 1373 Folder 23 239
Case P. 25 289 Dr.F / he-. ^;

IMPERIAL CHEMICAL INDUSTRIES LIMITED London, United Kingdom

CONTAINERS FOR PACKAGING OR FILLING MEDIA OR LIQUIDS; THAT ARE SUBJECT TO OVER ATMOSPHERIC PRESSURE.

Priority: August 24, 1972 - Great Britain '

The invention "relates to containers for filling of liquids that are under overpressure. A container for filling a liquid, for example a carbonated beverage can be made from a sheet of flexible, tubular thermoplastic Foil can be produced as described, for example, in GB-PS 1,241,948, 1,251,672, 1,254,0991 and 1,302,450 is. The present invention now relates to a new method for closing or sealing a or "Both ends of such containers. According to the Erühdunp, there is a container for filling liquids under positive pressure from a length of flexible, hose-shaped Plastic film, which is laid flat at at least one end and folded transversely by 180 ° around a rod is, v / obei the end is firmly and continuously discharged? ier fold around the bar by a Strips of decayed material are enclosed, then it is unfolded. The length of the strip and

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the "rod is at least as large as the flat .Breite of the tubular film, so that in this way a gas-tight Closure is created.

The empty container can initially be sealed at either end and then filled through an opening in the wall as described, for example, in GB-PS 1,251,672 is. If desired, the container can also be used initially only closed at one end and then through the

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other end filled ^ "uai then to be sealed. Conveniently, each end of the container is sealed in accordance with the present invention.

The closure according to the invention is self-sealing i / o suppose that the folded end is firmly clamped between the rod and the deformable strip ir, t; ' and ever The greater the internal pressure in the container, the greater the sealing pressure on the film layers be inside the breech. A thermal seal or some other seal is required between the inner surfaces of the tubular film. Probably depends on the main sealing mechanism in the closure depends on the tendency of the pressure inside the container to push the closure strip off the end » but this is prevented by the clamping effect between the strip and the rod and thus leads to a seal * pressure leads transversely to the layers of the film between the rod and the closure strip. Another possible sealing mechanism depends on the tendency of the pressure within the container to open the layers of film and thus the bar on one side against the closure strip to press and thus to generate a sealing pressure across the layers of the film. The invention int however does not depend on the accuracy of these statements of sealing effect, and other statements are quite possible.

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BATHROOM ħ

The 'container contents can be from. Gas and / or liquid consist, "for example of beer or something else carbonated drink that is under an overpressure

of about 30 kN / m, with a slightly carbonated one Drink under cold conditions up to 4CO kN / m a highly carbonated product under very warm Conditions. The central, substantially cylindrical part of the packing is suitably cylindrical with paper or the like. Wrapped around so the tubular film against accidental To protect against tearing and continue to provide a good base for labeling the product and also a rigid envelope for the opened package after the pressure has been released. The end of Pack which has been closed according to the invention, however, corresponds to the laid-flat width of the Tubular film and can therefore not be inserted into the cylindrical casing. To get the slide close to the To protect ends against tearing, it is therefore desirable to reinforce these ends with outer layers, namely by applied reinforcement strips made of flexible sheet material. These can consist of a film or paper, and they preferably extend on the outside of the container down to the part which assumes a substantially cylindrical shape, when the container is inflated. So that means that the lower edges of the reinforcement strips should lie within the cylindrical shell of the finished pack.

The tubular film for the container is expediently made made of biaxially oriented poly (ethylene terephthalate), although other thermoplastic polyesters such as poly (ethylenediphenoxyethane-4,4'-dicarboxylate) or polymers of similar mechanical properties can be used. Certain types of nylons and certain uniform copolymers of acrylonitrile and styrene, which are 86-93 mol% of acrylonitrile

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BATH

23A219A

and which are preferably solidified by particles of a compatible grafted rubber can also be used. A biaxially oriented tubular film made of poly (ethylene terephthalate), as it is described in GB-FS 1.271.694- is special suitable, especially if they are covered with a gas-impermeable coating, for example "made of a vinylidene chloride -! ^ is coated with polymer. The wall thickness of the. · The hose must generally be larger s & n, the larger is the lay flat width, and the required thickness naturally depends on the mechanical properties of the respective plastic film. A wall thickness of at least 20 μm (for example 30 to 450 μm) is generally suitable for a biaxially oriented poly (ethylene terephthalate) tubular film with a laid flat width of 50 to 200 mm. The strength of the stuck-on reinforcement sheet, which is used to consolidate the ends of the container. is applied, is preferably at least as great as the strength of the. Tubular film.

The diameter of the rod which is used to manufacture the closure according to the invention is at least as large and preferably 2 to 4 χ greater than the total folding strength of the film layers, ie the sum of the strengths of the 4 film layers and the reinforcement sheet, if one is used will. The rod can be made of any rigid or resilient material and is preferably a metal rod or a piece of plastic monofilament such as nylon, thermoplastic polyester or poly (propylene). The ends of a flexible single thread can extend beyond the closure and be connected to one another on the outside in order in this way to form a handle for the package.

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The strip which encloses the foil folded around the rod is made of deformable material so that it can be shaped accordingly and is relatively free from kinks. Preferably the strip is made of metal, for example sheet metal (which can be galvanized or colored), stainless steel or aluminum. Most plastic materials do not have suitable mechanical properties to be used for this purpose. For a rod or wire with a diameter of 0.5 to 1 mm and a total folding thickness of the film of 300 to 600 μm, a sheet metal strip of 0.3 to 0.5 mm thickness is generally suitable. The width of the strip is at least sufficient that it can be deformed around the fold of film surrounding the rod or wire and, if desired, larger so that the strip can be folded over the fold forms parallel flanges lying on either side of the adjacent film. A suitable filling or filling opening can be provided from the outset on the container according to the invention. B _e ispielsweise this may be of the type, as described in French Patent dor 2.14? .269. Such a fill opening consists of a hole in at least one of the two surfaces of one end of the container, this or each hole being closed by a removable, glued-on patch of gas-tight, flexible material so as to create an outlet opening for the package. Preferably, two such filling openings are provided, namely one on each side of the end of the package, which are preferably both closed by patches, or by the ends of the same glued-on patch. This arrangement makes it possible that one opening can be used for pouring out the liquid contents of the pack, and the other allows air to enter the pack. If the openings are covered by different parts of a single patch, the patch can preferably consist of one

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There are strips which extend across the end of the package, one or both ends . are not glued so as to provide a handle that the patch can be removed from the openings.

A preferred embodiment of a container and a packaging according to the invention and devices for a method for pulling the container are based on the accompanying drawings explained in more detail. ·

Show it:

Figure 1 shows a filled container in a perspective view,

FIG. 2 shows a longitudinal section through one end of such a container, the rod, the closure part and the film layers in cross section reveals, and

Figures 5

to 6 show the one already closed at one end

Container as it is filled and closed at the other end.

As can be seen from FIGS. 1 and 2, a section 1 is formed from flexible tubular plastic film. the actual body of the container, and the ends of this section are reinforced by strips 2 which are glued on the outside of the surface of the tubular film and extend somewhat beyond the side folds of the same, where they adhere to one another and thereby form narrow ribs 2a. Each end of the tubular film is revived and is wrapped around a flexible rod or wire 3 by 180 ° and firmly enclosed on this by a deformable strip 4 which is clamped around. In this way, a liquid operated closure becomes

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created across the layers of the film. This is shown in particular on an enlarged scale in FIG. in which the rod 3 and the strip 4 are shown in cross section and between these the tubular film 1 and the glued-on reinforcement film 2 is in place. , ':. In contrast, the opposing surfaces of the tubular film 1 are not connected to one another on known terminations for liquid-tight containers made of tubular film. At one end of the packaging are the free ends of the flexible rod if desired connected to one another so as to form a handle 3a (Figure 1) for the packaging. On the other At the end they are essentially identical to the, ends of the

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Strip 4 cut off. A sticker fb seals a pouring opening, and it preferably extends to the other side of the container closure in order to close another opening there. The free end of the sticker is folded back and protrudes freely outwards to provide an opening handle . to form, the sich'von the cylindrical paper sleeve 6 durchrockt to the outside, which • surrounds the container tightly and supports the middle part of the same.

As already mentioned, the container can be formed with both terminations from the beginning, after which it then is filled through an opening in its wall in the manner described in GB-PS "3.251 · 6? 2. If desired only one end of the container can be closed from the beginning, and it is then closed by the other iinde filled, which is then closed. Such a mode of operation is described below with reference to Figures 5 * to 6 of the drawings, which illustrate the working steps in a container, the lower end of which is already is closed and reinforced, by means of the rod 3 of the flexible strip 4, ·. being at this end also already an opening strip and a handle broken ao, in kannnon.

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The working method is described using an example ", in which a carbonated drink is lulled into the container.

An upper closure clamp 7 holds the non-closed end of the open container by means of a vacuum below a filling nozzle 8, which is then / as shown in FIG. 5, guided into the open end of the container. The upper closure clamp 7 then clamps the ends of the tubular film around the end of the nozzle 8 so as to produce a pressure-tight closure. The container is then brought to a desired pressure by introducing a gas through the nozzle 8. If a carbonated beverage is to be filled, the container is preferably pressurized with carbon dioxide to a pressure equal to the pressure prevailing in the storage container for the beverage, from which the deses is to be filled a predetermined amount of the carbonated beverage is filled into the container 1 under the desired pressure, as shown in Figure 4. The liquid can be pumped into the container or it can be poured into the container under the action of gravity. The liquid is preferably cooled, for example to 5 ⁰ C.

Below the upper locking clip 7 is a second locking clip 10 provided. After the container has been filled under pressure, this lower clamp becomes 10 pressed firmly against the tubular film in order to create a temporary pressure-tight seal and the upper Terminal 7 is released. The nozzle 8 is withdrawn as shown in FIG.

While the lower clamp holds the container contents 9 under pressure, it is transferred from the filling station to a station via · »

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out, in which the reinforcement lining 2 is applied to the surface of the container 1 and glued to it by means of clamps will. These facilities are not shown in the drawing. If desired, these can be reinforcement strips ready to be applied during the manufacture of the container »This way of working becomes special preferred as the strips for both ends of the container can be easily accessed in a single stage of the working process can be applied. It also allows for a lot of head space in the finished package can be kept smaller than in the case where a space 'must be reserved for the strips to follow them . to be able to apply the filling.

The container is then taken to a third work station where the reinforced upper end of the tubular film folded 180 ° around a rod 3 and a strip of deformable material clamped around the fold in exactly the same way as it was at the lower closed end of the container the case is. j d-il * Attachment of a handle desired is and this is not already provided from the outset at the lower end of the container, 'so the rod material for the closure of the upper end are supplied from a supply in the form of a closed loop, to serve as a handle for the finished pack.

The lower clamp 10 is then released and the closed containers can then be wrapped in a cylindrical paper envelope 6, as described in FH-PS 7.228.533. In this procedure:

1. the pack into a partial by mechanical means brought cylindrical shape, over more than half, but less than the entire circumference, and at least over part of its length on which the wrapping is to be applied.

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2. The starting end of the paper strip forming the envelope is glued to the surface of the pack,

3. The package is rotated with the assistance of the mechanical means so that the beginning end of the Paper strip gets between the mechanical means and the pack,

4. This rotation is continued for more than a single complete rotation of the pack so that the strip is wrapped around the package, and

5. the last end of the strip is glued to the part of the same underneath. In this way, the cylindrical paper envelope 6 overlaps the reinforcement sheets 2, which are attached to the ends of the container, and the folding of the sticker 5 of the opening closure, as can be seen from FIG.

In a special embodiment of the container and the packaging, as explained with reference to the drawings, the container can be formed from a length of about 260 mm of a biaxially oriented tubular poly (ethylene terephthalate) film, which, for example, according to GB -PS 1.271-694 is manufactured. This tubular film has a flat width of 70 mm and a wall thickness of 36pi and has a 3 µm thick covering made of vinylidene chloride mixed polymer. This container holds about 3CO ecm beer or other carbonated G _p tränkea with a pressure of about 100 kN / m ^ at about 20 ⁰ C. Each end portion of the container is äthylenterephtalat by laminating the film tube with a pair of strip 2 of biaxially oriented poly ( ) Reinforced film of 40 μm thickness, each of which is longer than the flat width of the tubular film, so that on this

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Way side ribs 2a are formed. Each of these Stripes-I is fen to be sufficiently wide to overlap kung _c later by the edge of the supporting shell at each end of Pa. The two opening outlets of the container are closed by a single strip of a sticker made of biaxially oriented poly (ethylene terephthalate) film 50 μm thick and 25 mm wide, which is provided with a 0.12 μm thick layer of a polyester adhesive. This strip is applied over the orifices after the end closure has been made. This strip is not attached to the container when it crosses the end closure and also the ends of the strip are exposed for a sufficient length to be able to be folded back to form an opening handle, as shown in Figure 1 of the drawing. The rod of the advance consists of a single nylon thread, for example nylon 6: 6 with a diameter of 0.9 mm. The closure strip 4 consists of a 0.4 ram thick sheet metal strip which has first been shaped into a U-shaped cross-section and is then clamped firmly over the layers of film wrapped around the single thread. In the finished packing, the middle part of the container is supported by the cylindrical paper sleeve 6, which surrounds it tightly. The envelope is expediently made of paper with a weight of 90 g / m. This is about 2.25 cal around the pack wrapped around after filling the same.

Although the subject matter of the invention with reference to ehe pack is described, in which both ends are closed in a similar manner, but one end of the same can also be closed in the same way as in GB-P3 1,302,450 is described. Although the subject matter of the invention is described with reference to a particular filling method for the pack however, the filling can also be carried out according to the method described in GB-PS 1,251,672.

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It has already been proposed to use closures for temporarily closing the ends of containers made of plastic film to provide that are suitable for domestic use, with the closures from an inner longer Consist of a rod around which the end of the container is folded and an outer resilient clamp, which is removable and springs around the hose layers around the rod, so that the container end first around the rod is folded over and the folded end of the container then into the resilient clamp of one Side is pushed in / Such locks are for it intended that they can be easily opened and closed, so that the contents of the container in small portions can be withdrawn, or that the container over a longer period of time Time can be used over and over again. Such a closure is not suitable for filling under Liquids under pressure, as is the case with the subject matter of the invention, when the closure is removed by hand can be, it would also be pushed open by the internal pressure in the container. It is so far considered impossible has been considered a mechanical closure for plastic film containers for beer and other carbonated To create drinks without the closures at the ends of the film tube by sealing the film can be produced.

PATENT CLAIMS:

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Claims (11)

y \) Container for filling liquids which are under excess pressure, characterized in that it consists of a length of a "flexible, tubular plastic film, which is flattened at least at one end and folded transversely by 180 ° around a rod (3) and is enclosed along the fold around the rod by a strip (4x) of deformable material by pinching it around the fold, the length of the strip and rod being at least as great as the lay flat width of the tubular film around in this way to create a gas-tight seal. 2. Container according to Anspnxch, characterized in that the Rod (3) is flexible. • 3. Container according to claim 2, characterized in that , the rod (3) made of a single string of plastic material " consists. 4. Container according to one of the preceding claims, characterized characterized in that the plastic tubular film is made of a biaxially oriented tubular film made of poly (ethylene terephthalate) consists, which is provided with a gas-impermeable coating. 5. Container according to one of the preceding claims, characterized in that reinforcing strips (2) made of bie gr The same material is applied to the outside of each surface of the end of the length of the plastic tubing, and this in. the folding are included. 6. Container according to claim 5 »characterized in that the reinforcement strips (6) extend over the sides of the Tubular film (1) extend out where they are glued together to form grooves and that these reinforcement tires along the container walls up to 409811 / 04U the portion which assumes a substantially cylindrical shape when the container is inflated or is filled. 7. Container according to one of the preceding claims, characterized characterized in that the diameter of the rod (3) is two to four times the total thickness of it surrounding film layers (1 and 2). 8. Container according to one of the preceding claims, da- 'characterized in that the strip (3) made of deformable Material consists of sheet metal. 9. Container according to one of the preceding claims, characterized in that it has an outlet opening at least one of the two surfaces is provided at one end of the container, with the Outlets are closed by a sticker (5) made of gas-tight flexible material. 10. A container according to claim 1 to 3, characterized in that the ends of the rod 3 from the single plastic thread are extended beyond the closure and connected to one another to form a handle (3a). 11. Container according to claim 1, characterized in that the middle, essentially cylindrical part of the same with paper od. The like. Is wrapped around a stiff Form support cover (6). 409811/0414 Blank page