DE1252574B - Device for manufacturing, filling and closing plastic bags - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

German class:

Number:
File number:
Registration date:
Display day:

B 65b

8ia-3 / e *. (. (

C 32398 Vn b / 81 a
March 12, 1964
October 19, 1967

The invention relates to a device for producing plastic sacks from a tubular film as well as for filling and closing the bags, with transport rollers, a separation welding device, Gripping members and with these downstream expansion members, with a molding box in the range of motion of the expansion members and filling and closing devices in the range of motion of the molding box. .

Granular and dusty goods, such as, in particular, plastics with a low bulk density, are used in large quantities from 20 to 50 kg, usually in paper bags with or without plastic film inserts packed on known bagging devices. The filled and closed bags form conditionally Due to the inherent rigidity of the packaging material, easily stackable structures, possibly box shapes can have.

In addition, attempts have already been made to give filled plastic sacks a box-like shape give, the bags were filled in molding boxes, evacuated and welded. Sacks with gussets and possibly welded corners were inserted into the molding boxes by hand The molding boxes are then closed, the sack is inflated with the aid of compressed air, the film adhering to it placed the walls of the box shape, the compressed air was finally released and the sack filled became. After filling, the bag was evacuated and welded. In this way rigid, easy-to-handle, box-shaped structures can be achieved. However, it turned out to be disadvantageous that the bags were only allowed to have the smallest dimensional tolerances in order to be neatly inserted into the molding boxes to be able to put the sacks in box shape, d. H. with inlaid gussets and possibly welded Corners that had to be prefabricated, and finally the bags after being inflated with compressed air fill the molding box and maintain the box shape by yourself after releasing the compressed air had to.

Furthermore, a device for producing bags, sacks or the like has already become known, the a filling and closing device is connected immediately afterwards. This device works by the bags by means of transport rollers, a separation welding device, gripping members and by means of these downstream spreading members revolving around an axis are produced, which attach the bags to a with Give up molding boxes equipped cell wheel, which in turn, the bags then the filling, closing and Feeding station supplies.

Device for making, filling and
Closing of plastic bags

Applicant:

Chemical works Hüls Aktiengesellschaft, Mari

Named as inventor:

Dr. Hermann Amrehn,

Amandus Weiss, Mari;

Dipl.-Ing. Rolf Harnischmacher, Rhade;

Dieter Jablonka, Recklinghausen;

Dipl.-Ing. Dr.-Ing. Helmut König,

Ludwig Wittrock, Mari

Apart from the fact that a lot of unused height is wasted due to the large number of spreader members rotatably arranged around an axis and the cellular wheel with the molding boxes, this device is not suitable for the above-described packaging of fine-grained or powdery bulk goods in quantities of 25 to 50 kg in Plastic bags as the to _; Flexible plastic bags cannot be self-supporting in the molding box.

The invention is therefore based on the object of a machine for packaging fine-grained and To build powdery bulk materials in plastic bags, with the plastic bags in the device can be made from the tubular film and the completely filled and closed sack is a rigid one represents cuboid and therefore easily stackable structure.

According to the invention, this object is achieved in that the apparatus described at the outset is used in a device Type the expansion members with the sack in the molding box with a hinged bottom can be lowered and the mouth parts of the filling device can be moved over the spreading members lowered in this way are arranged and that arranged on the closing device, in the pivoting range of the molding box, a device for evacuating the bags is provided.

The tubular films can be made of plastics such as polyvinyl chloride, high-pressure and low-pressure polyethylene, exist. Powdery and granular fillings, especially. Their powdery and granular plastics, plastic granulates, fertilizers, are in question.

709 678/258

An exemplary embodiment of the invention is explained in more detail below with reference to the drawings. The essential parts of the device are shown in Figs. From the tubular film roll 1, the take-off rollers 2 pull off the tubular film 21. The tubular film 21 lies or slides on the support surfaces 3. The photoelectric scanning device 4 stops the tubular film 21 from being pulled off the roll! If, for example, one of the

return. The tubular film section is, as in A b b. 2 shown, stretched on the two expansion members 7 in a box shape. The lower corners of the sack have developed automatically as a tip 5 and are stretched when retracting the The sack is turned up in the molding box. The spreading members 7 with the stretched tubular film section pivot with the aid of pneumatic or electrical means of transport in the dashed lines in

p g

brings the other. Is applied from above with the help of electrical or pneumatic exercise equipment Foil pressed on.

At the end of the support surfaces 3, two vacuum suction devices 6 grasp the bag film and open it the sack mouth, then pull the sack over the two spreading members 7, until the Scanning device 4 the foil feed to the welding Whd d Shiß d

printed film attached mark in the scanning front ίο Fig.l drawn position and then lower Direction 4 arrived. It also emits a start signal into the molding box 8.

to the welding and cutting device 5, is this tubular film section on the spreading

which is retracted in a known embodiment from members 7 in the molding box 8, so is

two high-frequency or thermal welding electrodes, before the filling process, the compressed air from the

Troden and the cutting knives. An electric cylinder, which carried out the bag tensioning, was removed is firmly attached below the bag film. This releases the sack tension, without the sack collapsing. The form supports can then after filling the sack can be pulled out without difficulty.

The height, width and depth of the flask are different for filling a certain amount of one Volume required for filling can be calculated. The height and depth of the molding box are fixed immutable Sizes for a filling of a certain pouring process stops. During the sweat and weight. The width of the molding box must be so big Cutting process detect two electrical or selected that the opened bag pneumatically operated gripper 22 already over the section with maximum dimensional tolerance of the hose both Mold supports 7 drawn bag mouth on the film can be pushed into the molding box. The sides of the sack are roughly in the middle of the side surfaces of the weighing vessel 9 of the weigh feeder 10.

Spreizglieder 7. Die.'Spreizglieder 7 have weighed a sack filling for 30 years. If the stretched covering of the sack mouth through the vacuum plastic sack is retracted into the molding box 8, the device 6 swivels the weighing vessel 9, e.g. B. with the help of a stand when they were with the bag open according to pneumatic actuating cylinder 10 a on the between A b b. 2 would have. the two spreading members 7 spanned open

If the named grippers 22 have the bag mouth 35, then the vessel shut-off valve 11 detected, so begin .die spreading members 7 apart, with the help of the pneumatic actuating cylinder 12 to run, d. H. their mutual distance increases. opens, whereupon the vessel is filled very quickly In this case, a form support preferably remains firmly in the sack. If the container 9 is empty, so stand while the other one moves away from the stand - it swings back to its starting position and becomes that moves away. This movement process can, for. B. 40 refilled via the weigh feeder 10, Executed by a pneumatic actuating cylinder. On the molding box 8 is on the two narrow sides

are, the surface and the actuating it each a gripper 23 attached. After the Pressure are designed so that the film section spreading members 7 stretched sack in the mold between Although the form supports are stretched taut, box 8 is inserted, the grippers grasp the sack, however is not overstretched and the adjusting cylinder 45 edge in the middle of the expansion members 7. After has not yet reached its limit. Pivoting back the empty vessel 9 will be the This device then automatically takes the two spreading members 7 from the filled, in the Avoidable dimensional fluctuations of the tubular film molding box 8 pulled out resting sack. the on. The two spreading members 7 thus serve to make the form supports run upwards and pivot in the process unstable tubular film 50 welded on one side into the in A b b. 1 position drawn in full line to section open in a box shape as it is back. If they are in this position, the begins is shown in Fig. 2. Its width depends on the cycle of the bag-opening.

according to the desired bag depth. You can choose from Are the expansion links 7 from the filled, im

sturdy sheet metal material that removes the sack from the outside molding box 8, so the pull is angled, or made of solid material with a 55 two gripper 23 the bag mouth diametrically out of one groove-shaped Depression in the middle of the lengthways, with the upper sides of the container between them exist. An opening extends over this depression, i. H. that is, the foils forming the mouth of the bag Sack foil is self-supporting, so that the gripper has a gap of a few millimeters at the ends. Can grasp the blind mouth without difficulty. The molding box 8 moves to the evacuation and

After cutting off the closing device 13 which is welded on one side. This can e.g. B. thereby th bag film section pull the gripper 22 with happen that the molding box 8, as in A b b. 3 Using pneumatic or electric transport, shown to one side around the fulcrum means the tubular film section is completely inclined over the 14. This is where the spreading members come apart 7. These diverge for so long, drawn sack mouth on the firm, something until they tuned the tubular film section with a 65 over the actual welding electrode 15 a have stretched the specified force. Is protruding rubber sealing strip 16 α to lie. the If this happens, the gripper and suction evacuation probe 17 is released with the help of electrical or devices and move into the starting position of pneumatic means of movement through the gap of the

The mouth of the sack is inserted into the sack down to the contents. The movable rubber sealing strip 16 b and the movable welding electrode 15 & move towards the mouth of the bag, the rubber sealing strips 16 a and 16 b sealing off the mouth of the bag. The probe 17 is connected to a vacuum device for a few seconds and the sack z. B. partially evacuated to 200 to 300 Torr. Then the welding electrodes 15 α and 15 b are pressed together after pulling the probe 17 out of the sack with the aid of pneumatic or electrical movement means and thereby the film ends are welded together. The parts of the sealing and welding device 16 & and 15 & then move back, whereupon the bottom flap 18 of the molding box 8 opens via a pneumatic actuating cylinder 19 and finally the finished, filled, box-shaped rigid plastic bag falls onto the conveyor belt 20. The bottom flap 18 closes again while the molding box 8 swings back into the vertical starting position.

This exemplary device includes additional devices not shown in the figures such as vacuum system, high-frequency generator for welding devices 5 and 13 or associated devices for a thermal welding device including associated control devices.

With the device according to the invention, it is possible to use the known advantages of plastic as Packaging material, here for the production and use of plastic bags, for storage and to be used for the shipment of fine-grained and powdery bulk goods. What before in more elaborate tedious manual work can be done in several successive steps had to and due to manufacturing inaccuracies and work errors to defects or complaints The new device makes it error-free in a significantly shorter time (15 to 20 seconds) carried out. Although the individual functions are known per se, as is the principle of their Implementation of the necessary device elements, so by their sensible arrangement and interlocking and interaction of their function

ίο created a packaging apparatus that solves the task of the invention in an excellent manner.

Claims (1)

Claim: Device for manufacturing plastic bags from a tubular film and for filling and closing the bags, with transport rollers, a welding cut-off device, gripping members and with these downstream expansion members, with a molding box in the range of movement of the expansion members and filling and closing devices in the range of movement of the molding box, characterized in that the spreader members (7) with the sack can be lowered into the molding box (8), which has a hinged bottom (18), and the mouth parts (9, 11) of the filling device can be moved over the spreader members (7) lowered in this way and that on the closing device (15 a, 15 i>), arranged in the swivel area of the molding box, a device (16 a, 16 b, 17) is provided for evacuating the bags. Considered publications:
German utility model No. 1 811758;
Swiss Patent No. 337 120;
U.S. Patent No. 2,997,831. 1 sheet of drawings