DE1063518B - Method and device for closing valve bags - Google Patents

Description

Method and device for closing valve bags in the previously known methods and devices for closing valve bags, to which the invention relates are methods and devices for closing valve bags with an adhesive strip inside the valve, which closes the valve after filling.

One of these known methods is that a thermoplastic Glue, especially a bituminous mass, used in the valve and during the Filling process by means of a heating device attached to the filling device is made.

The filling device used to carry out this known method for valve sacks has a heating device attached to the filling pipe or to the sack holder on the thermoplastic adhesive strips in the bag valve during the filling process heated from the inside or outside until it is adhesive.

The heating of the thermoplastic used to close the bag valve Mass takes place by means of the heated filling pipe of the bag filling machine, namely in that very short period of time while the bag to be filled is on the filling tube the bag filling machine is hanging. As a very short period of time for the implementation of the Filling process is sufficient, the thermoplastic must also be heated during this time Mass take place, which is not possible without difficulties. The heat transfer must be done too quickly, so that the thermoplastic mass at moderate Degrees of warmth is not sufficiently heated through and through. That could be if applied high degrees of warmth can be achieved, but this has the consequence that this is too high degree of heat has a very detrimental effect on the paper of the bag valve treated with it because the paper heats up too suddenly and is therefore made too brittle.

The feeding of filled packages with valve closures from the Filling to closing devices has become known through a device which Fills valve packs and initiates their automatic further transport to thereby to allow closure of the Alentil hose.

This is essentially a control for a automatic filling and closing device for packages with valve closure, whereby the sluice of the valve filling device by actuating a single push button put into action and the clamping of the bag is effected at the same time the lifting of the knocking device and the conveyor belt including the compartments is controlled until it is in the area of the bag to be filled, and after Fall of the filled bag the conveyor belt including the Closing bag steers further, with the valve bags one behind the other and continuously without manual With the help of the automatic closure.

These known measures, which relate to the feeding of filled However, valve closure packages are restrictive to a closure device only intended for packs that are particularly small compared to valve sacks.

In addition, there is the heating of the glued sealing surfaces of packs while they are being led past heating devices with the objects packed therein not new anymore.

A machine of this type has become known that is used for packaging of objects in glued packets, especially cigarettes. These The machine is especially designed to remove the packets after they have been made by gluing Seal to dry.

The finished parcels to be dried, one after the other by the packaging machine from arriving in a fixed slide, are thereby in the by circulating Steel belts formed passage introduced and from these circumferential steel belts forwarded to the exit end of this passage. During their through the passageway formed by the circumferential steel belts, the packets are pressed together and heated by the heating elements, thereby rapidly drying the parcel should be brought about.

The packets are not closed by thermoplastic Adhesive. This known machine is unsuitable for closing valve bags and not intended for it.

A cooling mechanism for heat seal closures is also known, which is connected downstream of a packaging machine, in particular as a bread packaging machine Is used.

To ensure sufficient and rapid cooling of the hot sealing points the packaging machine is followed by a cooling mechanism, which consists of an endless floor conveyor belt and two endless side conveyor belts. These conveyor belts should preferably be made of canvas because of this moisture can absorb well.

These conveyor belts are used to hold the closures together, to convey the packaged objects further and at the same time to cool the closures. To make the conveyor belts more effective, they are soaked in water.

The side conveyor belts can be made from a tank that is connected to a Drip valve is provided, over circumferential ring brushes, the periphery on their outside absorb the dripping water emerging from the drip valve of the water tank and this transferred to the side conveyor belts, cooled.

Finally, the bottom conveyor belt and the two side conveyor belts immediately moistened by ordinary spray devices.

This known packaging machine is used for closing valve bags and the downstream cooling mechanism for the cooling processes of closed Sack valves or valve inserts unsuitable.

To the existing disadvantages when closing valve bags resolve, according to the present invention, the method for closing Valve bags carried out in such a way that the filled valve bags in per se be transferred in a known manner to a transport device that the after one side aligned valve openings to soften the in the valve inserts located thermoplastic adhesive, as known per se, on a heating device be passed and that after the softening of the adhesive that from the valve protruding end of the valve insert for the purpose of bringing the adhesive surfaces together the valve insert is pulled out at a further work station.

This ensures that the heating of the to close the Bag valve serving thermoplastic mass not, as before, by means of the heated The filling tube of the bag filling machine takes place too quickly, but after the removal of the filled paper valve bags from the filling tube of the bag filling machine, gradually in the course of the onward transport of the filled bags, which is carried out by means of a conveyor belt device he follows.

Since this further transport of the filled paper valve bags on a not too short dimensioned route takes place, namely the heating of the with the Bag corner provided with a bag valve and the valve insert assigned to it with the thermoplastic Mass initiated gradually and gradually up to the required maximum limit can be increased. By the fact that the filled paper valve bags from the conveyor belt device be worn and guided in mutually aligned manner so that the with the Bag corners equipped with a bag valve can slide along or along a heating rail. be passed over a heating rail, by means of which the arranged in the bag valve thermoplastic mass adhesive melts under the action of heat attained goodness, the free ends of the valve inserts protruding from the bag valves can be one after the other in one continuous operation with a simple gripping and pulling device be pulled out in the direction of the longitudinal axis of the valve channel. This is done by a division of the adhesive layer causes the valve to close.

The procedure can be supplemented in such a way that following the process of closing the bag valve with the valve, the valve insert and the corner of the bag provided with the thermoplastic mass, as is known per se, a cooling process by means of I (old air flow or spraying.

This ensures that the thermoplastic mass through the The effect of the cold air flow cools down and sets faster and therefore the bag valve is sealed more quickly.

By spraying, which can be done by means of spray water, is in addition to the cooling process, that the normal moisture content is achieved of the paper that is released when the bag valve is closed by the action of heat has dried up to a certain extent, is restored.

Finally, the method can be supplemented by the fact that after the closing of the bag valve, the end of the valve insert protruding from the bag valve is folded onto the bottom of the sack and glued to it.

As a result, an additional locking mechanism is achieved and at the same time avoided that the protruding end of the valve insert from the bag valve too bulky protrudes outward and flutters in an undesirable manner.

According to the invention, a device can be used to carry out the method Find use, which is characterized in that the transport manual device assigned in a manner known per se a heating rail and connected to the heating rail a gripping and pulling device is arranged for pulling out the valve insert.

There is another embodiment for carrying out the method in that the manual transport device consists of a feed conveyor belt, on which the filled sacks are placed on another conveyor belt in their longitudinal direction are supplied, which is used to align the filled bags in one another Way, preferably in a vertical position, and below a third conveyor belt is arranged on which the bags together with the overlying transport hand are moved, and that to guide the filled sacks under the conveyor belt arranged heating bar continues upwards in a circular arc.

These devices can also be designed so that as a heating device an electric heat radiator is arranged.

Exemplary embodiments of the invention are shown schematically in the drawing illustrated. 1 shows an apparatus for carrying out the method seen from the side, the heating of the thermoplastic mass by means of a Heating rail takes place, Fig. 2 shows a section along the line A-B in Fig. 1, Fig. 3 a Conveyor belt, which has electric heat emitters instead of a heating rail, FIG. 4 shows a section along the line C-D in FIG. 3, FIG. 5 shows another embodiment the device for carrying out the method on a larger scale, Fig. 6 shows a section along the line E-F in FIG. 5, FIG. 7 shows a sack corner with valve inserts and the thermoplastic mass arranged therein before the valve inserts are unfolded and FIG. 8 shows the sack corner illustrated in FIG. 7 with unfolded valve inserts just before closing the valve.

As can be seen from Fig. 1 in connection with Fig. 2 of the drawing is, the filled paper sacks 1 after they are pulled from the filling nozzle of the sack filling machine - which is or is not shown in the drawing - a conveyor belt device fed, which consists of a flat conveyor belt 2, on which the filled, Flat bags 1 aligned and guided in the longitudinal direction in a horizontal position are, and then transferred to a conveyor belt 3 arranged below, which serves, the filled sacks 1 in mutually aligned manner at preferably vertical position.

This conveyor belt 3 is assigned a heating rail 4 so that the Sack corner 6 provided with sack valve 5 is slidable over heating rail 4 is feasible. By means of the heating rail 4, the one arranged in the bag valve 5 is obtained thermoplastic mass 7 (Figs. 7 and 8) under the action of the heating rail 4 outgoing heat adhesive pliability before being pulled by pulling the free, protruding from the bag valve 5 end 8 of the valve insert 9, 9 ', z. B. at a line a-b running parallel to the longitudinal axis of the valve channel, divided bipolar and is used to close the bag valve 5.

The actuation of the free end 8 protruding from the bag valve 5 the valve insert 9, 9 'is carried out by a gripping and pulling device 10 (Fig. 6), which is operated in the direction of the arrows shown that initially the off the end 8 of the valve insert projecting from the jaws 11 and 11 'in the direction of the blind valve the vertical arrows is grasped and held and the gripping and pulling device 10 is then moved so far outwards in the direction of the horizontal arrow 12, that the folds 13 and 14 or

13 'and 14' existing double folds (Fig. 7) unfolded and thereby the heated thermoplastic mass 7 on the line a-b, which is parallel to the longitudinal axis of the valve channel runs, is divided bipolar so that a double adhesive surface 15 and 16 or 15 'and 16', which are created when the bag valve is closed connects to one another, as indicated in Fig. 8 by the arrows drawn is. The bag valve 5 is closed by moving it in the direction of these arrows squeezes.

In Fig. 7 and 8 in the bag valve 5 is a tongue-shaped top and bottom Valve insert 9 or 9 'attached by means of normal adhesive 17, as it is through the Point 17 is indicated. The device according to the invention is for locking the illustrated bag valves as well as for tongue-shaped valve inserts that either Fastened individually below or above or together below and above in the valve channel and can be used for tubular valve inserts.

As illustrated from FIG. 3 in connection with FIG. 4 of the drawing is, the heating of the thermoplastic mass 7 when the heating rail is omitted 4 take place by means of electric heat radiators 18.

These are shown in Figs. 3 and 4, and by those facing upwards Arrows indicate that the electric heat radiator 18, the heat flow in the direction these arrows against those with the sackcloth valves 5 provided bag corners 6 of the paper valve bags 1, which are carried and guided by the conveyor belt 3. That the conveyor belt 3 to be assigned to the conveyor belt 2 illustrated in FIG. 1 is omitted in FIG. 3.

In Fig. 5 in conjunction with Fig. 6 of the drawing is in a larger Scale illustrates a conveyor belt device consisting of a flat conveyor belt 2 consists, and underneath a transport hand 19 is arranged, which is used to to receive the filled sacks 1 in a mutually aligned manner, and below this conveyor belt 19 is a flat conveyor belt 20 is arranged on which the filled sacks 1 in the opposite direction together with the one above Conveyor belt 19 is moved and carried by the lowermost conveyor belt 20. A heating rail 4 is assigned to this lowermost, flat transport hand 20 in such a way that that the bag corner 6 of the paper valve bag 1 provided with the bag valve is slidable is passed over it, wherein the heating rail 4 is arcuate upwards runs at a distance X from the outer periphery of the conveyor belt 19, which must be dimensioned so that it corresponds at least to the length L of the filled sacks 1. This arcuate part of the heating rail 4 also inhibits the bags 1 during the transition from the conveyor belt 19 to the conveyor belt 20, so that they this route as a result of their Do not cover difficulty too quickly. It is also possible to use this transitional route to arrange an additional braking device Z, as indicated by the circular arc running dashed lines is indicated.

Following the final end 21 of the heating rail 4 or the electrical Heat radiator 18, a fan 22 can be arranged, which a cold air flow against the bag corner 6 of the bag 1 provided with the bag valve 5, which leads to a distance Y happens, which is indicated in Fig. 1, 3 and 5 of the drawing. A spray device 23 can also be effective on this section Y. In Fig. 5 the fan 22 and the spray device 23 are shown schematically and in Fig. 1, 3 and 6 are omitted for the sake of clarity.

In the drawing (Fig. 1) are guide bodies 24 and 25, which are made of smooth Can consist of sheet metal, shown, which give the bags 1 the necessary guidance, when these are transferred from the conveyor belt 2 to the conveyor belt 3. The limiting roller 26 serves to restrain the sacks 1 at their upper end in such a way that that they are from the conveyor belt 3 on the guide body 27, which is made of smooth sheet metal can exist, and can be transported from here, as in Fig. 1 is illustrated schematically.

In Fig. 3 of the drawing, these parts 24, 25, 26 and 27 are omitted.

With the transport chains 28 of the conveyor belt 19 (Fig. 5 and 6) Collecting funnels 29 are connected in an articulated manner, which serve to hold the paper sacks 1 to be picked up and guided by the conveyor belt 2 as illustrated in FIG. 5 is.

The heating rails 4 in FIGS. 1 and 5 are advantageously in fields 30 subdivided so that each field up to the respective desired degree of warmth for itself can be heated. The heating rail 4 is expediently heated electrically Ways, as indicated in Fig. 6 by the connecting wires 31, but it can can also be done by steam or hot water.

By means of the conveyor belts 2 and 3, the filled sacks 1 can also downwards and upwards if these conveyor belts are used accordingly are formed and arranged, for. B. assume a corresponding incline.

PATENTANSI'ROCHE: 1. Method of sealing by heating a thermoplastic adhesive layer closable within the filling valve Valve bags made of paper or similar material, in particular bags with valves, whose valve insert is folded in this way and in which the adhesive is so in the folds is housed that when pulling out the insert a division of the heated Adhesive layer takes place, characterized in that the filled valve sacks are transferred to a transport device in a manner known per se, that the valve openings (5) aligned to one side to soften the in the valve inserts located thermoplastic adhesive, as known per se, be moved past a heating device (4) and that after the softening of the Adhesive protruding from the valve end of the valve insert for the purpose of Merging the adhesive surfaces, the valve insert at a further work station is pulled out.

Claims (1)

2. The method according to claim 1, characterized in that subsequently to the process of closing the bag valve (5) with the valve (5) of the Valve insert (9, 9 ') and the thermoplastic mass (7) provided with the bag corner (6), as is known per se, a cooling process by means of a cold air stream (22) or spraying is subjected. 3. The method according to claims 1 and 2, characterized in that that after closing the Sacltventils (S) that protruding from the bag valve (5) The end (8) of the valve insert (9, 9 ') folded over onto the bottom of the sack and glued to it will. 4. Device for performing the method according to the claims 1 to 3, characterized in that the conveyor belt device (3, 20) in itself a known manner associated with a heating rail (4) and connected to the heating rail a gripping and pulling device is arranged for pulling out the valve insert. 5. Apparatus according to claim 4, characterized in that the conveyor belt device consists of a feed conveyor belt (2) on which the filled bags (1) in their longitudinal direction are fed to a further conveyor belt (19), which serves to hold the filled sacks (1) in a mutually aligned manner, preferably take up in a vertical position, and arranged below a third conveyor belt (20) is on which the bags (1) together with the overlying conveyor belt (19) are moved, and that to guide the filled sacks under the conveyor belt (20) arranged heating rail (4) continues upward in the shape of a circular arc. 6. Device according to claims 4 and 5, characterized in that that an electric heat radiator is arranged as a heating device. Documents considered: German Patent No. 896 780; German utility model No. 1 721 657; French patent specification No. 1 030 446; U.S. Patent No. 2,420,763.