DE2337939A1 - PROCESS FOR THE CONTINUOUS PRODUCTION OF LIQUID PACKAGING AND DEVICE FOR CARRYING OUT THE PROCESS - Google Patents

Description

The invention relates to a method for continuous ichen Production of liquid-filled packaging with two narrow and two wide side walls from one Hose, in which the at least one side with a liquid-impermeable Plastic coating provided The web of carrier material is folded over and welded to form a continuous tube, which is used for the individual Packaging has necessary folding lines and is filled in its lower part with the liquid. The invention also relates to a device for carrying out the method, with deflection rollers for the carrier material web, one arranged from above the longitudinal welding station, up to the lower part of the hose reaching filler tube for the liquid to be packaged, with a

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Cross welding station and with a cutting device for Separation of the packaging.

Numerous machines and methods of the aforementioned type are known. The term "continuous production ¹¹ " is understood to mean an at least partially intermittent drive. The intermittent movement is necessary because the forming, transverse welding and separation of the packaging from the tube must be carried out in a separate part of the device, which for reasons of convenience is stored stationary is.

Understandably, every device with intermittently controlled work processes has disadvantages with sid) associated with reduced speed, increased acceleration of large inertia forces and thus also increased abrasion are.

It is therefore the object of the present invention to provide a method and a device of the type mentioned at the beginning To improve and design the type in such a way that the movement of the hose or the packaging takes place continuously, so that the device is also continuous in all its movements.

According to the invention, the object is achieved with regard to the method in that the lower, with liquid

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filled part of the tube over a curved veg is preformed in such a way that the chain-like adjacent packagings are on edge and their outer ones narrow side walls stretched along an outer radius of curvature, while the inner narrow Side walls of the packaging run along an inner, smaller radius of curvature and here along the Fold lines are folded in and preformed, then cross-welded, separated and, via another smaller one Radius of curvature in opposite direction of curvature running, folded and shaped on the outside. For the first time, this process allows a truly continuous one Mode of operation, so that the throughput of these mass-produced articles can be increased considerably Plastic, usually with polyethylene coated carrier material web is known ¥ ice once along their Center line folded over so that two Matorial webs result, which are connected to one another at one edge via the fold line and along the other The edge on which the two free material ends are located can be joined by means of a longitudinal welding station In front of the longitudinal welding station, a filling device is provided which has a filling tube that extends far into the extends more or less obliquely downward running hose. Even before the packaging is formed or even separated the tube is filled with liquid.

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The fundamental novelty of this invention lies in the pre-deformation the packaging in a line that follows a curved curve, with the packaging on edge arranged along this line of curvature. Upright means here that the wide side walls the cuboid packaging are arranged in front and behind or right and left, while the narrow side walls run up and down or outside and inside. Obviously the outer radius of curvature is larger than that inner, in such a way that the edgewise packaging is still stretched on the outside, i.e. a reduction in length of the hose has not yet taken place, while the narrow ones arranged on the inside on the smaller radius of curvature Side walls already experience a fold, which leads to a reduction in the original length of the hose. Even during this arrangement, i.e. with the outer side wall stretched and the inner narrow one already folded Side wall, the transverse welding and separation of the individual packages from one another, e.g. by cutting, where the transverse welding station with the middle »over the curved Line running packaging is moved. More precisely, it involves a large number of transverse welding stations. In the context of the method according to the invention, however, it is important that the transverse weld takes place during the rotation. After the packagings have been separated, they run off the first circle with the aforementioned radius of curvature to a second with a smaller radius of curvature, here the

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resulting rotation is reversed. This will the folding of the outer narrow side walls, which remained stretched, is brought about, so that after this Stations the individual packaging is then preformed so far that only one pressing of the protruding Lashing and gluing the same must be done at the top or bottom of the packaging.

In an advantageous further development of the invention, the isolated packs, which are preformed on their narrow base walls, are continuously applied to co-rotating pressure rollers passed for final shaping. These ensure the aforementioned folding down of the tabs that are still protruding and, if necessary Gluing or sealing these flaps to the top or bottom of the packaging.

According to the invention, it is also particularly advantageous if the continuous welding of the umgefaiteten Web of carrier material to the continuous hose by butt welding the free material edges using liquid introduced plastic takes place. This method has considerable advantages because it is along the weld seam there is no longer any overlapping of the ends of the carrier material, creating a thickened strip. It will not only material saved, but also cross welding is also greatly facilitated and improved. The two

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For example, transverse welding seams arranged on the bottom and on top of the packaging are namely in the case of the thickened Strip, i.e. if the ends of the carrier material are placed one on top of the other, can only be sealed with difficulty. It lies that the transverse weld seam covers areas with two carrier material layers as well as with four carrier material layers must run. At those points where the longitudinal weld is made, there is after folding over or double-laying the place with the four layers of material lying on top of one another. Can be seen the perfect sealing with cross welding especially at the transition points between the areas with two material layers and those with four material layers difficult. Often, good and even heating and thus even welding cannot be achieved can be achieved because the contact pressure of the welding jaws at the transition points mentioned is difficult. this will inventively avoided in a surprising manner, so that a welded connection with high tensile strength and absolute tightness results because during butt welding the introduced liquid plastic material is automatically distributed somewhat over the edge areas.

The continuous transverse welding according to the invention in the manner of butt welding is sufficient - like experiments have shown - a welding time of 3 seconds at a throughput of 10,000 packages per hour.

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An essential feature of the above-described method according to the invention consists in the precise setting of the curvature, ie the angle at which the same take-off direction and uniform take-off speed is guaranteed _{for the carrier material, ie the cardboard or the paper 8.}

The device for carrying out the method, with pulleys for the carrier material web, one from above the longitudinal welding station, which extends into the lower part of the hose, for the filler pipe to be packaged Liquid, e.g. milk, with a transverse welding station and with a cutting device for separation of the packaging is characterized in that in the area of the lower part of the tube a circular, continuously driven, having gripping devices Carousel is provided, on the circumference of which the packagings lying against one another in a chain-like manner together upright with the cyclically controlled gripping devices are arranged circumferentially, and that in addition to the carousel one in reverse Direction of rotation driven turntable is mounted at such a distance that the path of the packaging follows a continuous curve. It is useful if the running direction of the hose has a component in the direction the force of gravity has, so that the filled liquid without special measures in the lower part of the hose can be maintained at a predetermined level. What is fundamentally new is the idea of using the hose and the chain-like

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tig adjoining packaging around the circumference of a carousel, so that deformation, cross-welding and separation can be carried out continuously during the rotary movement without disrupting the filling process and the continuous flow. The arrangement of the turntable next to the carousel represents a reversal of the form principle insofar as only the so-called inner narrow side walls can be created on the carousel by shortening the length of the hose, while on the turntable, however, with simpler means, namely without gripping devices Forming the opposite, so-called outer narrow side surfaces of the packaging can be made. It is understood that the other work processes, such as pressing the protruding flaps, welding them onto the upper and lower surfaces of the packaging, possibly counting and conveying away, are adapted to the continuous work cycle. This means that the pressure jaws for the final deformation also run along and the conveyor belts, counting devices and the like have the same speed, so that no jams or delays in the removal of the separated and fully formed packages have to be accepted.

Furthermore, the invention is embodied in that the hose is arranged tangentially running onto the carousel, the packagings lying next to one another in a chain-like manner run off the carousel after a rotation of about 250

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are provided and as many cross welding stations as Gripping devices are provided, the welding activity of the transverse welding station at about half of the 25O route takes place. In a special execution form According to the invention, 18 gripping devices and thus also 18 transverse welding stations are provided. This machine-technical Effort does not mean any disadvantage because the machine according to the invention has an unexpectedly high throughput Has.

It is advantageous if, in a particular embodiment, the transverse welding station has cam-controlled sealing jaws and comprises the cutting device. In this way, a compact design and the controls can be provided - mostly via cam disks - on the one hand the cutting knife and on the other hand the sealing jaws can mechanically can be easily linked together in a confined space.

According to the invention, the axis of rotation of the carousel is parallel to that of the turntable and arranged transversely to the direction of travel of the hose. This is in a particular embodiment compare the projection of the running direction of the hose on the horizontal with the axial directions. These measures lead to a further simplification of the device because deflection rollers are saved and none Speed differences arise when pulling off the packaging or the hose.

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To control the gripping devices is a special one Embodiment of the invention, a stationary cam disk attached to the axis of rotation of the carousel, on the control surface of which slide plungers which can be moved in the radial direction roll, which at their outer end are the gripping devices wear. This type of control represents a robust construction in which the mechanical engineer ksnn use his extensive experience.

According to the invention, it is useful here if each gripping device has a lever which is rotatably articulated on the plunger and which has a U-shaped cross-section, and that the web of the U-lever is longer than the legs of the U and has a length which is equal to the height of the finished folded packaging. The bars grip the inner one Curvature line of the hose drawn in a circle around the carousel or the chain of the packaging and wear effortlessly contributes to the deformation of the fold lines already present in the hose material. A special control of the levers is not required because it automatically adapts to the so-called inner narrow side wall during rotation the packaging. With regard to the length of the web, it should also be noted that in comparison to Of course, a small tolerance is provided for the height of the folded packaging, i.e. the length of the The bar is a little shorter than the height of the folded packaging, for example by the two

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up to six times the thickness of the carrier material web.

In another embodiment of the invention has the gripping device rotatably hinged to the rams, positively controlled gripping tongs. These capture at the Contact point of the hose with the carousel the connection points of the packagings lying next to one another and thus bring about the folding along the intended Fold lines. The positive control of the gripping tongs mentioned can also be done mechanically with the radial Movement of the ram must be coupled

In order to complete the final deformation, the invention has in a particular further embodiment the feature that the turntable evenly distributed on its polygonal circumference, stationary forming punches carries, the length of which in the direction of rotation is equal to the length of the webs of the lever. The turntable can be seen easier, namely built without the gripping devices or without the levers * From the gripping devices of the carousel the separated packages are pressed onto the turntable and the forming die in such a way that the forming takes place the so-called outer narrow side wall of the respective packaging is carried out properly.

The longitudinal welding station advantageously has two opposite directions driven, cooled Wsriae »rollers with parallel Axes of rotation, between which the free ends of the carrier

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tracks run through it, furthermore an extruder with filling container and filling pipe of the type that the outlet opening of the extruder is attached directly in front of the rollers in the running direction of the carrier webs. Through this squat The stump welding station is constructed after a one-off Supply of heat, namely to liquefy the granulate, the weld seam, which is carried out immediately after its completion and molding is cooled by the rollers · In this way it is possible that already in not too large Removal of the tube is so solidified that it can be filled with the liquid to be packaged without that the weld seam tears open again. It is tactical here if the rollers are designed as hollow rollers, their Interior is provided with inlet and outlet lines for coolant. According to the invention, Aä is expedient the device for folding the carrier web in the form of a tube is provided in such a way that the tube passes one roller anaer butt weld.

Further advantages, features and possible applications of the present invention emerge from the following description in connection with the drawings «It shows:

Fig. 1 in side view schematically the overall structure of the device according to the invention,

2 shows the top view of the removal station transversely to the turntable,

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Pig. 3 the view of the discharge station of FIG. 2 seen in the direction of arrow ¹¹ A ",

Fig. H shows another embodiment of the gripping device of the carousel,

Fig. 5 shows a cross section of the longitudinally welded, filled and hose not yet formed,

6 shows a cross section of the tube preformed on the inner narrow side wall at a point where the The packaging has not yet been cross-welded and has not yet been isolated, but lies next to one another in a chain-like manner and

7 shows, in section, an enlarged illustration of the transverse welding station with cutting device.

In Fig. 1 the entire system is shown, some parts are shown schematically ^ The entire machine is carried on the frame 1, which has a towering stand 2 approximately in the middle, on which the upper pulleys, the filling station 3 and the butt welding station k for the production of the longitudinal seam, that is to say closing the tube 5, are held. The roller 7 of the carrier material web 8 is rotatably mounted on the shaft 6 shown on the left in FIG. 1. From this roll, the carrier material runs over pulleys 9 and 10 upwards in the direction of arrow 11. It is turned over by the diagonally arranged pulley 12.

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steers and passed the guide rollers 13 and Ik , down to the right in the direction of the carousel 15. After leaving the deflection roller 1 * 1, the carrier material web 8 is folded over by known folding devices (not shown in the figures) in such a way that a kink occurs along the center line 16 in such a way that the free ends or edges 17 and 18 of the material web are arranged opposite one another, as shown in the area below the filling station 3.

At this point the hose 5 is still open, so that the filling pipe 1 ° - can be inserted into the hose 5. The filling tube extends from above the butt weld did ion k into the lower part 20 of the hose 5 into it. The level 21 of the liquid 22 can be clearly seen in said lower region 20. The butt welding station k has a container 23 for the plastic granulate and an extruder 2k, known per se, which introduces the liquid plastic to the point between the free edges 17 and 18 of the carrier material and between the rollers 25 and 25 '. These rollers form the butt weld made of plastic, if necessary to a profile, which is cooled down at the same time. In the lower part 20 of the hose 5, the profile-like butt weld has solidified in such a way that the liquid 22 can be filled.

Transverse to the projection of the running direction of the hose 5 are the axes of rotation 26 and 27 of the carousel 15 or the rotary

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disc 28 arranged. The turntable 15 has 18 gripping devices 29, which are described in more detail below. At the point marked with the arrow 30, the activity of the transverse welding station 31, which is described in more detail in FIG. 7, takes place with the cutting knives 32 Control surface 3k de gripping devices 2p roll. The carousel 15 is driven in the direction of arrow 36.

The rotary disk 28 is driven in the opposite direction of rotation, as shown by the arrow. It has forming punches 38 on its circumference, which have no moving parts. The delivery station kO, which is shown in greater detail in FIGS. 2 and 3, is located next to the turntable 28.

In Fig. 2, the carousel 15 is not shown again, and the turntable 28 is only indicated schematically. The individual packagings kl are shown, the tabs kz of which still protrude in the upper part and are glued to the top or bottom of the pack by pressing jaws% 3 shown in FIG. 3 after prior heating by the heating device kk. A conveyor k5 (Fig. 3) driven at the appropriate speed j takes the one shown in Fig. 3 on

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Farthest left shown, falling from the turntable packaging kl and guides it with sliding surfaces h6 under the heating device and the pressure jaws, from where they are carried away to the last conveyor k7 by corresponding guide devices and held by the slides k6 .

The gripping devices 29 are in terms of one embodiment explained with reference to FIG. 1. They have plungers 50, which are under spring tension of the spring 51, carry on the inside of drain rollers 52 and on their outer ends with rotatably hinged, positively controlled Gripping tongs 53 are provided.

The other embodiment of the gripping devices 29 is shown in Fig. H visible. There, too, the tappets 50 have U-shaped levers 55 pivoted on their outer ends, whose web 56 connecting the two legs of the V 57 and 5 ^ is longer than the height of the legs 57 and 58.

Pig. 7 shows the cross section of the transverse welding station 31 1 which also rotates on the axis of rotation 26 of the frame. As mentioned above, each gripping device 29 is assigned a transverse welding station 3 ¹ . The mechanical transmission of the control of the gripping device 29 through the control cam 3k _t can be seen on the right and left in FIG. 7

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are shown · Further are further out and likewise Curves 60 for controlling the sealing jaws 61 and the counter jaw 62, respectively, on the right and left in the illustration of FIG. 7 appropriate. The mechanical coupling takes place via swivel parts 63 and piston 64 under spring tension. Another curve 65 is shown in the left half of FIG shown, which provides for the control of the cutting knife 32. At the top in the middle between the sealed bake-offs 61 resp. Counter-jaw 62, the partially preformed tube 5 is shown.

The operation of the device is as follows erfiiidungsgemäßen t

The tube 5 filled with liquid 22 is drawn tangentially onto the circumference of the carousel 15 in the direction of the arrow 36 by the drive of the carousel 15. In the embodiment of the gripping devices according to FIG. 1, the gripping tongs 53 engage the points between the packaging in such a way to the right and left of the later separation point that "ioJi. the packagings are folded in on the inside of the circle, that is to say on their so-called inner narrow side walls, thereby shortening the length of the tube 5. It can be seen from the right half of the cam disk 33 'i.e. the right part of the control cam 3k that the gripping tongs remain in the clamping position along about 180 °. The packs are now pulled around in the direction of arrow 36 so that they fit on the outer circumference.

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stay stretched. The angles and the curvatures are like this set so that proper promotion can take place in the direction of the circular line.

According to the embodiment of FIG. K , the webs $ 6 of the lever 55 engage the inner narrow side walls of the packaging from below, so that here too the? corresponding folding takes place along the intended folding lines JO.

In Fig. 5 the cross-section is the longitudinally welded filled one and packaging or tube 5 that has not yet been formed is shown.

After according to Flg. 4 those lying next to one another like a chain Packaging further demanded by about 9 ° in the direction of arrow 36 6 shows the cross section of the tube 5 formed on the inside.

At the point 30 shown in FIG. 1, the transverse welding station 31 then comes into operation, ie the sealing jaw 61 moves under corresponding cam control against the counter jaw 62, which also moves towards the center, and welds the tube filled with liquid. Shortly thereafter - likewise cam-controlled - the knife 32 and the groove 71 come into operation for cutting, as a result of which the packages Ή are separated. Meanwhile, the carousel 15 has rotated further in the direction of the arrow 36.

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After about 180 the clamping handle of the gripping tongs 53 'or the levers 55 move back to the folding position radially inwards towards the center of the carousel 15. As a result, the individual packagings are free for transfer to the turntable 28. However, there still remains a sufficient pressing force so that the so-called outer narrow side walls of the packaging are pressed onto the forming dies 3 ^ of the turntable 28. This results in further deformation of the packaging on its narrow outer side walls. The turntable rotates in the direction of arrow 37 and conveys the separated packages 4i to the delivery station ^ to. Circumferential pressure jaws lf-3 glue the flaps that are still protruding, but which have not been folded by conventional guide devices, onto the top or bottom of the packaging 41. The conveyor k '] then derives the finished and filled packaging ^ 1.

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Claims (1)

Claims ί 1.J Process for the continuous production of liquid-filled packaging with two narrow and two wide side walls from one tube, in which the carrier material web, which is provided with a liquid-impermeable plastic coating on at least one side, is folded over and welded to form a continuous tube, which is used for the individual packaging has necessary fold lines and is filled in its lower part with the liquid, characterized in that the lower, liquid-filled part of the tube is preformed over a curved path in such a way that the chain-like packaging lying on edge and their outer narrow side walls stretched along a outer radius of curvature run, while the inner narrow side walls of the packaging run along an inner, smaller radius of curvature and are folded and preformed along the fold lines, then transversely welded individual and, running over a further smaller radius of curvature in the opposite direction of curvature, are folded and shaped on the outer side. 2, method according to claim 1, characterized in that the isolated and on their narrow side walls in front - 21 - 509807/0087 Shaped packagings are continuously passed on to concurrent Ali " pressure rollers for final deformation -> 3β method according to claim 1 or 2 _S characterized in that the continuous Versclweißung the umgefaltefcen Trägerraaterialbahn welding to your durchgehendai tube through S · tujuipf the free Materi alkanteii effected by means of liquid incorporated of plastic. Η » Device for carrying out the method according to one or more of Claims 1 to 3» ^with deflection rollers for the carrier material web, a filler pipe for the liquid to be packaged, which is arranged above the longitudinal welding station and extends into the lower part of the hose, with a Cross-welding station and with a cutting device for separating the packaging, characterized in that in the area of the lower part (2θ) of the hose (5) a circular, continuously driven carousel (15) is provided which has gripping devices (29) and on the circumference of which the chain-like adjacent packagings (4i) are arranged upright together with the cyclically controlled gripping devices (29), and that next to the carousel (15) a rotating disc (28) driven in the opposite direction of rotation is attached at such a distance that the path of the packagings (4l ) follows a continuous curve, - 22 - 509807/0087 5 · Device according to claim h _t characterized in that <k>f; the hose (5) is arranged tangentially running towards the carousel (15), the chain-like packaging lying next to one another is provided running down from the carousel after a rotation of about 250 and as many cross-welding stations (3 ') as gripping devices (29) are provided, whereby / i. the welding activity of the transverse welding stations (31) took place about halfway down the 250-way H 6 "or device according to claim 5» characterized in that the cross welding station ciaß (30 nockengestouorte sealing jaws _(61? 62) and the cutting device (32, comprising 71). 7 · device according to claims 6 ₈ h characterized by that the axis of rotation (26) of the carousel (15) to the hub · (27 »28) in parallel and arranged transversely to the running direction of the hose (5) _e 8 _O device according to claims h to 7, characterized in that a stationary cam disc (33) is mounted on the axis of rotation (26) of the carousel (15), on the control surface (3 * 0 of which ram (5 ° ) that carry the gripping devices (? °) at their outer end. 509807/0087 9. Device according to claim h or 8, characterized in that each gripping device (29) has a lever (55) which is pivoted to the plunger (50) and has a U-shaped cross-section, and that the web (56) of the The U-lever (55) is longer than the legs (57, 58) of the U-lever and has a length which is equal to the height of the fully folded packaging (hl) . 10o device according to claim h or 8, characterized in that the gripping device (29) has positively controlled gripping tongs (53) articulated ^{on dt 11 plungers (50) drchbai 1.} 11. Device according to claims k to 7, characterized in that the turntable (2H) evenly distributed over its polygonal circumference, t-tatinary forming punches (38) "carries, the length of which in the direction of rotation is equal to the length of the webs 56 of the lever (55 ) is. 12. Device according to claims k to TI, characterized ₉ that the longitudinal welding station (k) has two counter-rotating, cooled ¥ alzen (25, 25 ') with parallel axes of rotation, between which the free edges (17, 18) of the substrate web pass , an extruder (24) with filling container (23) and filling pipe is arranged so that the outlet opening of the extruder (2h) is attached directly in front of the rollers (25, 25 ') in the running direction of the carrier web (8, 5). 509807/0087 _oL - 2k - 13. Device according to claim 12, characterized in that the rollers (25o 25 ') are designed as hollow rollers, its interior with inlet and outlet lines for coolant is provided. 1 ^. Device according to claim 12 or 13 "characterized in that the device is provided for the folding of the substrate sheet (8) in tubular form so ₃ that the hose (5) engages around the one roller (25) as they pass at the butt weld. 509807/0087 Blank page