Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B70/00—Making flexible containers, e.g. envelopes or bags
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
  • B31B2150/001—Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom
  • B31B2150/0014—Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom having their openings facing transversally to the direction of movement
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B2155/00—Flexible containers made from webs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B2155/00—Flexible containers made from webs
  • B31B2155/003—Flexible containers made from webs starting from tubular webs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B2160/00—Shape of flexible containers
  • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B2160/00—Shape of flexible containers
  • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B70/00—Making flexible containers, e.g. envelopes or bags
  • B31B70/003—Opening or distending bags

Definitions

• the invention relates to an apparatus and a method for the production of sacks comprising woven fabrics of stretched plastic tape, according to the preamble of claims 1 and 13.
• Such devices are known and have been available on the market for a long time. As a rule, they initially comprise a separating device in order to separate a supplied fabric hose, which may also be coated, into hose pieces. These consist of two superposed material webs, each web of material can be constructed of several layers of different material. The pieces of hose are then taken over by at least one transport device in order to spend them in the individual processing stations. One of these processing stations is the so-called bottom opening station. Here, at least one end of a piece of tubing is pulled open, so that a bottom can be molded onto this wound-up end. In general, both ends of a piece of hose are processed in this way.
• the lower material layer of the hose section is held in place by negative pressure on the table on which the hose section rests during transport.
• the upper material layer is thereby folded back on the outside of the upper material layer, so that a Boden rectangle arises.
• corner impacts also occur, which form on both sides of the floor rectangle and have a triangular shape.
• the sheet is pulled back and transported the bag on.
• the hose pieces are successively taken over by a further transport device, which feeds them in a uniform speed, ie continuously, a bottom closure device.
• the bottom rectangle and the corner impacts are thus in the plane of the hose piece, preferably in the horizontal direction.
• the soil remains in the horizontal plane as the method of bottom closure has advantages.
• both press rollers can act on the floor over the entire width. This can not be done, for example, if the floors are orthogonal to the actual bag body. In this case, no continuous nip can compress the entire floor. In the area of the ground center line where the bag body is located, the one must Press roll inevitably be interrupted. So there can be no compression, which could cause leaks in the finished bag.
• Another aspect of tillage in the plane of the bag body is that, when the bottom is welded by means of hot air and a ground cover sheet is welded, the hot air is uniformly applied to the parts to be welded. So there is a uniform joining instead.
• the object of the present invention is therefore to propose a device for producing sacks, which allows a simpler procedure in the opening of the ends of the hose pieces, wherein these ends are opened so that the open bottom is in the plane of the bag body.
• the device contained in the device for opening the ends of the hose pieces includes means for folding over the ends of the hose pieces from the horizontal position to a vertical position.
• the two material layers continue to lie together.
• one end of the tube piece is folded upwards by about 90 degrees, so that approximately between the tube piece and the folded-up end a right angle is created.
• a folding down by 90 degrees is conceivable in principle. In this way it is possible to separate by relatively simple opening means, the two layers of the up or folded down the end and fold into the horizontal. This process can then take place simultaneously for both layers and especially during continuous operation.
• a piece of tubing having an open bottom is obtained, which does not differ from a piece of tubing provided with an open bottomed cycle, so that the known bottom closure station can be used. Due to the uniform working method for both material layers, the mounting of the floor can be done faster, so that the performance can be significantly increased.
• the means for opening at least one end of a piece of tubing for this end comprises at least two detection devices, with each detection means a material layer of the respective piece of tubing can be detected and wherein the material layers are separable from each other with the at least two detection means.
• These detection devices are adapted to apply forces to the two outer layers of material, wherein the forces are directed opposite. The forces must be large enough to overcome any attractive forces that may be caused by an electrostatic charge, for example.
• the detection devices need, if the ends of the tube piece are folded over 90 degrees from the horizontal, are moved only in a horizontal plane. This saves compared to other devices for the production of bags comprising woven fabric of stretched plastic, height.
• the detection devices are arranged on rotating elements, such as discs, on which detection devices are mounted eccentrically, they can be operated at least temporarily with the same speed vector, which indicates the speed direction and the amount of speed, as the hose section.
• the layers of the end of a piece of tubing can be separated even if the piece of tubing is transported in continuous operation.
• suckers that can be arranged on a beam. These can be brought to both sides of the folded-up end. After being subjected to negative pressure, the suction cups can be removed from each other again so that the layers of material are likewise removed from one another. Now the inside of the hose piece is accessible.
• the device for opening at least one end of each of a piece of hose comprises supports to which the detection devices can be fastened.
• the detection devices can be mounted in different positions, so that the material layers can be detected independently of the height of the folded-up end of the hose piece.
• the carriers are designed as guides which extend parallel to the folded ends of the hose piece, ie perpendicular to the plane of the hose piece. By moving the detection devices along the guides so they are adjustable in height.
• the distance of the detection devices to the transport plane of the hose pieces is changeable.
• the region of the hose piece end folded over by 90 degrees is already small, so that the Detecting devices along the guides are brought close to said transport plane.
• the detection elements are further removed from the transport plane.
• the guides may be configured as simple rods to which the detection means by means of suitable fastening means, such as knurled nuts, can be locked. If at least two parallel guides are provided for each detection device, tilting of the detection devices can be prevented. Overall, such a detection device can be easily and quickly arranged in their vertical distance to the hose piece.
• the height of the up or down folded end ultimately defines the width of the finished floor.
• a particularly preferred embodiment of the invention includes spreading elements, which can be introduced between the two layers of material of the end of the hose piece to be opened. Furthermore, it is advantageous if these spreading elements move the material layers so far away from each other that they are then completely horizontal. Such expansion elements have a good effect especially when operated in combination with the detection devices described above. In this case, the spreading elements can dive without problems in the space between the already separated by the detection elements material layers.
• the means for opening one end of a piece of tubing comprises at least one pressure roller, which forms a gap together with an abutment, through which at least parts of an open end of a piece of tubing feasible and these parts can be acted upon by a pressing force.
• This pressure roller thus has the task to flatten the reared soil and thus to fix in the open mold.
• the counter-layer can also consist of another roller. It is particularly advantageous if each side of the device a individual pressure roller is assigned, so that the open ends of a piece of hose can be pressed separately.
• offset in the transport direction means that a processing step takes place first at one end of the hose piece and the same processing step takes place at the other end of the hose piece after the hose piece has been transported further
• the pitch center distance is the distance from fold line to fold line, the fold lines being the ones around which the end areas are folded upwards.
• the step of setting up the tube piece ends preferably takes place in the sequence described, but this method step can also be used for both ends occur simultaneously, since the corresponding device components do not need much space.
• a great advantage of a staggered arrangement is the fact that, above all, the individual elements of the bottom opening station with the
• FIG. 1 is a schematic diagram of an apparatus for producing tissue sacks.
• FIG. 2 is a perspective view of a bottom opening station in a device according to the invention. 3 View III - III from FIG. 2
• FIG. 4 View IV - IV from FIG. 3
• FIG. 5 View V - V from FIG. 2
• FIG. 1 schematically shows individual steps for processing a fabric tube into sacks, as they take place in sack making device 1.
• the fabric tube 2 is fed to the sack manufacturing device 1. This is advantageously done by unwinding the fabric 3 forming a fabric tube in a processing device 4. Subsequently, the tube 2 experiences the so-called opening in the layer separation station 5.
• the fabric tube is guided around an inner tool around which separates the two layers, so that the layers, if they were glued together in one of the manufacturing steps of the tube, separate. Only with separate layers can it be ensured that the following production steps can be carried out properly. Afterwards, the separate material layers of the hose are put back on top of each other.
• the fabric tube is now fed to the cross-cutting device 6, which separates the fabric tube into individual pieces of hose.
• the conclusion of the actual Sackherstellreaes forms the application of a ground cover sheet on the floors in the cover sheet station 11.
• the cover sheets can also be welded.
• the finished bags are then placed on the bag stack 12 and transported away from there on unspecified manner.
• FIG. 2 shows details of an opening station 5 in a device according to the invention.
• the tube pieces 13 are transported by means of a transport device not shown in the direction x on the surface of a support 14, for example, on the surface of a table, lying flat, so horizontal.
• a transport device not shown in the direction x on the surface of a support 14, for example, on the surface of a table, lying flat, so horizontal.
• this end is first brought from the horizontal position to a vertical position.
• the hose piece must be counteracted.
• the hose piece 13 is threaded under a folding belt 16.
• This folding tape can be relative to the hose pieces in peace and thus relative to the support in motion.
• the hose pieces can also move relative to the folding belt 16. This is the case, for example, when the seam is at rest.
• the rebate belt may consist of a flexible, but highly prestressed material. Preferably, however, these consist of steel sheets, which are connected in a manner not shown with the support 14 or with the machine frame. Steel sheets have the advantage over other components of a smaller thickness with the same load capacity. If the hose piece 13 is threaded, it is then guided past a guide element 17, for example a baffle. After the end 15 of the tube piece 13 has been brought into the vertical position, this comes to the actual bottom opening device 18, which is shown schematically in this figure. In this bottom opening device 18, two suction bars are provided, which engage on both sides of the folded-up end and are guided in or against the direction z, so that the material layers are separated from each other.
• suction bars are also moved in the direction X in order to be able to attack the further transported bag.
• the interior of the end 15 of the tube piece 13 is now accessible.
• Spreading elements now engage in this interior, which push the material layers further apart until they are horizontal again. This situation is illustrated by the open bottom 19.
• the opening of the second end 15 'of the tube piece 13 takes place in the same way, but offset from the opening of the first end 15.
• the first end is already opened in the bottom opening device 18, while the second end 15' is guided under the folding band 16 '.
• the open bottom 19 ' is generated in the manner described above.
• a staggered arrangement of the components is advantageous when bags are to be produced with very small bottom center distances A.
• the piece of tubing with open bottoms 19, 19 ' is present, wherein all components of the opened bottoms are located substantially in the plane of the support 14.
• each bottom opening device 18, 18 ' is supplied with torque by its own drive. This is illustrated by the motor 22 on the bottom opening device 18.
• the corresponding motor on the bottom opening device 18 ' is not visible in the illustrated view.
• the motor of a bottom opening device 18, 18 ' primarily supplies the suction bars with a drive torque, so that they can move the material layers away from one another.
• the spreading elements are powered by this engine with torque.
• the conclusion of the bottom opening devices 18, 18 ' form the pressure rollers 23, 23', which serve the purpose of compressing the freshly opened soils and thus to fix in their position.
• the resulting in the context of the bottom opening creases are struck out and then form correct folding edges, so that the tendency of the soil decreases, straighten up again.
• the pressure rollers 23, 23 ' As a counter-pressure element to the pressure rollers 23, 23 'is either the support 14 or the counter-pressure rollers 24, 24'.
• the pressure rollers 23, 23 ' are arranged in the transport direction x seen in Figure 2 at the same height. These rollers 23, 23 'can also be arranged offset from one another, so that the open floors can be pressed immediately after the opening process in the manner described.
• FIG. 3 shows the view III-III in FIG. 2. In this FIG. 3, details of the bottom opening station 8 can be seen.
• End 15 of the tube piece 13 are provided with suction bars, of which the viewer facing suction bar 20 can be seen.
• the folded ends 15 of the hose pieces 13 have different heights H.
• the suction pads 20, 20 'on vertical guides 21, 21' releasably secured, so that the suction pads in the direction of the double arrow y along the folded ends 15 can be moved and adjusted according to their heights H.
• the guides can be made in various ways. These can be round or rectangular profiles that are solid or hollow. 4 shows the view IV - IV of Figure 3. In addition to the front suction bar 20 and the front guide 21 are now also the suction bar 20 'and the guide 21' can be seen.
• FIG. 5 shows the view V - V of FIG. 2.
• the pressure roller 23 is mounted in a lever arm 25 or in a lever arm pair.
• the lever arm 25 itself is pivotally mounted in the machine frame or in attachments 26 of the machine frame.
• the lever arm 25 about an axis 27 which is fixedly connected to attachments, pivotable and fixable on this axis.
• a suitable, but not shown clamping device may be provided.
• the lever arm is freely rotatably mounted on the axle 27.
• the lever arm 25 is fixedly connected to a shaft which is rotatably mounted in the attachments.
• the pressure roller 23 can now act on the opened trays with a predetermined force, for example its own weight.
• the support 14 which is shown in the figure 2 serve.
• a counter-pressure roller 24 with which the pressure roller 23 forms a nip in which the open trays 19 are compressible.
• the counter-pressure roller can be rotatable, but arranged fixed to the frame.

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• Making Paper Articles (AREA)
• Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Priority Applications (5)

Applications Claiming Priority (3)

Publications (2)

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Family Applications (1)

Country Status (8)

Cited By (3)

Families Citing this family (7)

Citations (4)

Family Cites Families (12)

• 2008
  • 2008-04-03 DE DE102008017442A patent/DE102008017442B4/de not_active Expired - Fee Related
• 2009
  • 2009-02-10 AT ATA218/2009A patent/AT506551B1/de active
  • 2009-03-30 BR BRPI0911265A patent/BRPI0911265B1/pt not_active IP Right Cessation
  • 2009-03-30 JP JP2011502365A patent/JP5743884B2/ja not_active Expired - Fee Related
  • 2009-03-30 CN CN2009801119072A patent/CN102006991B/zh active Active
  • 2009-03-30 WO PCT/EP2009/053747 patent/WO2009121842A1/de not_active Ceased
  • 2009-03-30 EP EP09727833.7A patent/EP2288492B1/de active Active
  • 2009-03-30 ES ES09727833.7T patent/ES2626121T3/es active Active

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