DE19642057A1 - Automatic plastics bag filling machine - Google Patents

Abstract

The packaging plant is used for wrapping items in foil or filling foil bags with material. A flattened tube of foil (2) is pulled from a roll (4) and passes over a conveyor belt (6) to a transverse welding station which welds the foil to itself at intervals to form a succession of bags. The bags pass between upper and lower vacuum bands which suck the bags open. They are opened at one side so that pushers (18) can force materials into the open bags (16). The filled bags then pass into a welding station (22,24). The finished bags (28) are conveyed away on a conveyor belt.

Description

The invention relates to a method and a device for opening, Filling and closing bags pulled from a tube (Packaging) with the features of the preamble of patent claims 1 and 3.

Known machines for opening, filling and closing such mostly as Bags of trained packaging can only be used with medium-sized ones Cycle numbers of up to 70 to 80 cycles per minute fill bags because they a slide system oscillating in the conveying direction (e.g. a forward or backwards running linear unit or a rotating traction system like a chain to which 3-4 sliders are attached) that pass through the product transported the packaging machine. This results in  Speed limits for these machines, especially if they are small bags.

So far known machines of this type for high speeds used, there are very high linear speeds and Accelerations affecting the life of the machine parts reduce. There are also stronger vibrations and noises. Furthermore, the goods as well as the empty and filled bags must be like this be moved quickly so that damage can occur.

The invention is therefore based on the object, a method and a Develop a device that allows opening, filling and closing such Allow bags at a much higher speed without being too high Generate vibrations and loads on the packaging machine, so that the life of the machine parts is extended.

This task is carried out with the characteristic features of Claims 1 and 3 solved.

Claim 2 further improves the method.  

Claims 4 to 8 bring details of a device.

It is from DE-PS 38 37 709, DE-PS 39 07 208, DE-OS 40 05 078, the DE-OS 44 12 577, EP 0 226 693, EP 0 308 078 and WO 91/12177 known to bags or packaging transverse to the film conveying direction weld.

DE-OS 44 35 294 shows that one can use individual empty bags can open from vacuum.

In the following description, an embodiment of the present invention described with reference to the accompanying drawings.

Show it:

Fig. 1 shows an inventive device for implementing the method according to the invention in a schematic view from the side,

Fig. 2 the same device in the view from above.

A film tube 2 is wound on a roll 4 and is pulled off this roll by an arrangement (not shown in the conveying direction A of the packaging machine). The film passes via a conveyor belt 6 to a cross-welding station 8 , at which the film tube is provided with cross-weld seams and cut open in the area of the front fold (front) in order to provide a sequence of bags which are suitably separated / separated from one another and between one lower vacuum belt 10 and upper vacuum belts 12 , 13 , 14 arrive (vacuum belt is to mean that a conveyor belt rotating over two rollers is provided with holes, with negative pressure being generated in the area between the upper and lower run, for example by using one between the two Trums arranged box with suitable suction openings air is extracted). The upper and the lower vacuum belt initially run parallel to each other in the conveying direction, ie in the area of the upper vacuum belt 12 in order to gradually take a larger distance from one another in the conveying direction A of the bag sequence (ie in the area of the vacuum belt 13 ) and to open the bags in this way, ie that the sequence of individual bags 16 is opened on one side to the conveying direction A.

Alternatively, it is of course possible to provide a rolled-up sequence of already finished bags instead of the film tube 2 with the subsequent cross-welding station 8 for forming the sequence of bags.

Laterally in front of the moving in the direction of conveyance A of the packaging machine, opened by the vacuum belts 10 , 12 , 13 , 14 bags 16 are in the direction of conveyance A over a limited distance CD moving product slide 18 are provided, the goods to be packaged, eg. B. hygienic articles such as articles of feminine hygiene, from the side into the open bag 16 . This is done by the product slide 18 moving from C to D in the direction of conveyance A additionally carry out a feed movement transverse to the conveying direction or a return stroke in the direction of the double arrow B and then are returned against the conveying direction A from D to C and from there a new one Start circulation, the mechanical implementation of which is not shown here. After the products have been pushed in by the product pushers 18 , which partially move in the conveying direction A, the bags 16 are closed and previously folded upwards, downwards or inwards transversely to the conveying direction by means of wrapping fingers 20, also partly moving in the conveying direction A. The impact fingers 20 are attached to a circumferential traction means 26 c. Closing takes place for weldable materials, e.g. B. plastic films, by welding. The partially running upper and lower welding bars 22 , 24 , which weld the folded-in sides of the bags or packaging together in weld seams, serve this purpose. The welding bars 24 are arranged on circumferential traction means 26 a, b, namely a lower traction means 26 b and an upper traction means 26 a, so that the welding bars enclose the still open bags between them by being moved towards them from above and below , so that the welding process can be carried out with a weld seam extending in the conveying direction A.

For bags made of non-weldable materials, another type of Closing, e.g. B. be chosen by gluing.

The circumferential welding bars 24 or impact fingers 20 are driven by the continuously revolving traction means 26 a, b, c. The closing or opening movement is ideally controlled by a cam track. The synchronization of the individual modules to each other can be mechanical, e.g. B. by cams, or electrically, for. B. done by servo motors.

The corner turn can also be done by compressed air or by vacuum getting produced. The welding process is instead of linear moving bars can also be realized by rotating rollers.  

An outlet belt 28 transports the filled and closed bags for further processing or shipping.

Reference list

2nd

Foil tube

4th

role

6

Conveyor belt

8th

Cross welding station

10th

lower vacuum belt

12, 13, 14

upper vacuum belts

16

opened bags

18th

Product pusher

20th

Impact finger

22

all-round welding bars (top)

24th

all-round welding bars (below)

26

a, b, c revolving traction devices

28

Conveyor belt
Special positions:
A FM funding direction
B Feed / return stroke of the product pusher
CD circulation of the product pusher

18th

Claims (8)

1. A method for opening, filling and closing a hose withdrawn bag, characterized in that the sequence of bags laterally opened on one side of a conveyor track, filled transversely to the conveying direction from the side of the openings and closed in the longitudinal direction (conveying direction). 2. The method according to claim 1, characterized in that the bag opened by vacuum belts running in the conveying direction. 3. Device for opening, filling and closing a hose withdrawn bag, in particular to carry out a method according to Claim 2, characterized in that a lower vacuum belt and an upper vacuum band enclose the bags between them, to the side of the Open the conveyor of the packaging machine and then the bags continue to convey open. 4. Device for opening, filling and closing a hose withdrawn bag, in particular according to claim 3, characterized characterized in that the moving product slide in the conveying direction Goods from the side transversely to the conveying direction in the open on the  Push in the conveyor belt forwards. 5. Device for opening, filling and closing a hose withdrawn bag according to claim 4, characterized in that in Conveyor fingers running along the open sides of the Fold the packaging across the conveying direction. 6. Device for opening, filling and closing a hose withdrawn bag according to claim 5, for closing the bag weldable material, characterized in that The jaws open the sides of the pouch lengthways weld. 7. Device for opening, filling and closing a hose withdrawn bag according to claim 6, characterized in that the in Conveying direction of the rotating welding jaws from below and above hit the packaging at the same time.   8. Device for opening, filling and closing a hose withdrawn bag according to claim 7, characterized in that the Welding jaws on the lower and upper, moving in the conveying direction Welding bars are arranged.