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
  • B31B70/00—Making flexible containers, e.g. envelopes or bags
  • B31B70/003—Opening or distending 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
  • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
  • B31B2150/003—Flexible containers made from sheets or blanks, e.g. from flattened tubes made from tubular sheets
• • 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

Definitions

• the invention relates to an apparatus and a method for opening an end region of a tubular bag body, which end region extends between an open hose end and a bottom center line, with a transport device on which the bag body with adjacent hose walls with a transport speed in a transport direction is transportable, wherein Bottom center line is aligned in the transport direction, and with transversely to the transport direction reciprocally driven suction devices that are movable towards each other until they rest against the tube walls of the intermediate end portion of the bag body and thereafter while exerting a suction force on the respective tube wall away from each other whereby they pull the tube walls away from each other, the suction means being additionally reciprocable in an oblique direction oriented at an angle to the bottom center line r are.
• Chest bags also called cross-bottom bags, are bags of cuboidal shape which are made in bag making machines by providing tubular bag bodies whose end portions are opened and folded into cross bottoms. The bag bodies are guided lying flat when folding through the clothing plant, so that the tube walls of the tubular bag body abut each other, especially at the end portions of the tubular bag body.
• the two tube walls are separated from each other at the end of the tubular bag body and folded over 180 ° with respect to each other, usually one of the two tube walls is folded over with the help of a spreading tool as a side flap on itself, creating an open bottom, in which the other tube wall forms a second side flap.
• valve sheets can be inserted, which are formed by further folding operations into a valve, through which the bags can be filled by means of a filler neck
• the overlapping bottom side flaps are glued or welded depending on the material Alternatively or additionally, bottom cover sheets can be placed on the overlapping bottom side flaps and glued or welded thereto.
• a corresponding Sackkon Stammionsstrom is described in AT 408 427 B.
• the bottom opening device with the aid of which the two layers are separated from one another at the end region of the tubular bag body, is designed as a pneumatic bottom opening device in which suction devices lying opposite each other with respect to the material layers to be separated are provided, which engage the tube walls of the bag body and the sequence are moved apart, whereby the tube walls are separated from each other, so that the spreading tool can intervene therebetween.
• the present invention is therefore an object of the invention to provide a bottom opening device for bag making equipment, with a continuous operation of the system is reliably guaranteed at a high production rate, the bottom opening device should be simple, inexpensive and robust and wear resistant as possible. Furthermore, the bottom opening device should also allow the safe opening of different widths of floors and a correct transfer to the following processing station and of course be suitable for continuous operation.
• the present invention solves this object by further developing the above-mentioned device and the method mentioned above for opening an end portion of a tubular bag body by the suction means in addition to their transverse mobility in an oblique direction, which is aligned on the one hand in the transport direction and on the other hand at an angle to the bottom center line ,
• the reciprocating suction devices are each arranged on a holder which is hingedly connected to first ends of two parallel pivot arms, of which at least one is driven to pivot transversely to the transport direction, said second ends of the pivot arms articulated with a Carrier carriage are connected, which carrier carriage in a guide rail in the oblique direction is driven to move back and forth.
• the point of application of the suction devices on the tube walls can be controlled with respect to the mid-center line and even adjusted during operation, whereby the opening s device is adaptable to end regions of different lengths which are formed into bag bases of different widths . Furthermore, it is possible with the opening device according to the invention to adjust the points of application of the suction devices on the tube walls to be separated so that they are as close as possible to the outer end of the bag body, whereby the precision of the opening operation is increased.
• the device according to the invention offers robustness, speed and multiple adjustment during operation, with a respective pivoting arm being expediently driven pivotably via an angle lever.
• the inventive device offers in addition to a relatively simple, inexpensive construction has the advantage that due to the parallelogram geometry of the structure of holder, swivel arms and carrier carriage during pivoting this Parallelogrammmaschine in the course of the opening process, the orientation of the suction with respect to maintained to be separated from each other tube walls, so that even if relatively wide end portions are raised, a safe and torsion-free opening or separation of the adjoining tube walls takes place and can intervene reliably in the later processing the spreading tools.
• the device according to the invention is particularly suitable for processing bag bodies made of stretched plastic tapes and / or plastic film, wherein the plastic material is preferably selected from polyethylene, polypropylene and / or PET. Also composites of the materials mentioned can be processed, and the bag body can be provided with a plastic coating.
• the web of stretched plastic tape may be provided with a plastic coating to achieve the tightness of the web, to improve printability, and to adjust other desirable properties. Sacks of stretched plastic tape have superior strength over paper or plastic film bags, but tend to slip in the manufacturing process and are also harder to fold than, for example, paper. Therefore, it is of particular advantage that these bag bodies can be handled by the present invention.
• bottoms can be formed at both opposite end regions of the tubular sack body, or a bottom can be formed only at one end region.
• the opening device according to the invention can be adapted particularly easy for the mounting of different wide bottoms and different width bag bodies become.
• a shallow angle is chosen against the mid-ground line, and for steeper soils, a steeper angle can be set.
• the precision of the opening operation is increased when the angle of the oblique direction to the center of the ground line is less than 45 °, preferably less than 30 °.
• the transverse guide means preferably rails, pivot arms and / or transversely arranged to the transport direction piston-cylinder arrangements arranged at the free ends of the piston Include suction devices.
• the inclined guide means preferably comprise rails, swivel arms and / or obliquely arranged piston-cylinder arrangements with suction devices arranged at the free ends of the pistons.
• the pivot arms are displaceable together in the oblique direction and can therefore in continuous operation of a bag making machine in a simple manner during the opening process with the continuously conveyed bag bodies be moved.
• the pivot arms of the respective parallelogram unit can be driven in any desired manner. It is conceivable to actuate the pivot arms by means of servo motors or motor / gear groups, hydraulic or pneumatic cylinder-piston units or via cables. According to a preferred embodiment of the present invention, however, it is provided that in each case a pivoting arm is driven via an angle lever and connected to the angle levers rods which are hinged to a control slide. Due to the parallelogram arrangement of the pivot lever, it is sufficient to actuate only a single pivot arm of a parallelogram unit, since the remaining elements of the parallelogram are forced.
• This preferred embodiment of the drive with an angle lever, rods and control slide is robust and maintenance-free.
• the pivoting of the pivot lever by means of control slide which is independent of the carriage slidably, represents a straight-line displacement operation.
• the carrier carriage and the control slide are guided on a common guide rail.
• peripheral drives in particular toothed belt drives, are preferred as drives for the carrier slide and the control slide.
• Timing belt drives are known to be reliable even with long running times and can be quickly replaced if necessary without the need for specially trained personnel.
• the displacement of the carrier carriage and the control slide could also be done by means of cylinder / piston drives, spindle drives or servomotors.
• the present invention is preferably further developed such that opposing suction devices are arranged offset from one another, whereby they attack each other offset to the tube walls to be separated. With such a positioning of the suction devices to each other succeeds a reliable separation of the tube walls.
• the guide rail is adjustable by means of adjustable storage with an adjustable angle in the oblique direction to the bottom center line.
• the adjustable bearing comprises elongated holes with recesses defined by recesses, a rapid change between different settings of the angle to the ground center line is possible. Switching between positions can be done with simple tools and, if necessary, by a single person.
• a particularly advantageous embodiment can be achieved if the mounting of the guide rail is adjustable by means of a motor drive.
• the adjustment of the angle can be accomplished without the use of tools, wherein it is also possible to make the adjustment computer-controlled to the desired bottom width, even during operation of the bag making plant.
• FIGS. 1 to 3 schematically show sections of a bag making machine in which the device according to the invention for opening an end region of a tubular bag body is used.
• FIG. 4 shows a perspective view of an embodiment of an opening unit of the opening device according to the invention.
• FIG. 5 shows a bottom view of the opening unit.
• FIG. 6 schematically shows a side view of a section of the bag making machine with built-in opening unit.
• the device 1 comprises a transport device 2 in the form of a conveyor belt which moves continuously at a transport speed V in a transport direction T.
• a transport device 2 On the transport device 2 are tubular bag body 10 in flat-lying state with its longitudinal extent L transverse to the transport direction T.
• the bag body 10 are secured on the conveyor belt by means not shown holding against slipping.
• the tubular bag body 10 are made for example of fabric of stretched plastic tape.
• the plastic tapes may comprise a polyethylene or polypropylene or PET material.
• the fabric has a plastic coating.
• the tubular bag body 10 may alternatively be made of plastic film.
• the tubular bag body 10 has two opposing open end regions 10e, 10f.
• the end portion 10e extending between an open tube end 10k and a bottom center line 10j is to be formed into a cross bottom.
• the end area can also be lOf in the same way how the end portion 10e is formed into a cross bottom, thereby producing a box bag or box valve bag.
• FIG. 1 it can be seen that the tubular bag body 10 initially rests flat on the transport device 2 in a first plane ⁇ . In this flat lying state, a first and a second tube wall 10a, 10b abut each other. Then, the end region 10e of the tubular bag body 10 is brought by means of a bottom center bar 12 and baffles I Ia, I Ib along a bottom center line LAj from the first plane ⁇ of the flat bag body in a second plane extending substantially orthogonal ⁇ 2. It should be mentioned at this point that the formation of the soil is possible even without this folding process.
• FIG. 2 shows the bag body 10 with the end region 10e folded so as to be completely orthogonal along the bottom center line 10J (in the second plane 2).
• the floor center strip 12 continues in the transport direction T and has now in cooperation with the deflection plate I Ia the task, the folded into the second level ⁇ 2 end of the bag body 10 in this angular position to the first level ⁇ in which the bag body 10 is located to hold.
• the opening device 1 further comprises two suction devices 13, 14, which are transversely movable transversely to the transport direction T on symbolically illustrated transverse guide means 15, 16.
• the transverse guide means 15, 16 may be formed, for example, as rails or pivot arms.
• the transverse guide means 15, 16 piston-cylinder assemblies wherein the suction means 13, 14 sit at the free ends of the piston and in such a way transversely to the transport direction T back and forth are movable.
• the transverse guide means 15, 16 are by means of inclined guide means 17, 18 in an oblique direction S, which is aligned on the one hand in the transport direction T and on the other hand at an angle cc to the bottom center line lOj or the imaginary extension of the bottom centerline back and forth.
• the ground center line 10j or its imaginary extension is aligned in the transport direction T in the plane ⁇ .
• the skew guiding means 17, 18 may be e.g. be designed as rails, swivel arms or piston-cylinder arrangements.
• FIG. 2 shows a method step in which the two suction devices 13, 14 have been brought into contact with the first tube wall 10a or the second tube wall 10b from opposite sides in the end region 10e.
• a vacuum is generated at the suction devices 13, 14, so that the first suction device 13 sucks in the first hose wall 10a and the second suction device 14 sucks in the second hose wall 10b.
• the suction devices 13, 14, when in contact with the tube walls 10a, 10b are moved at a speed in the oblique direction S whose speed component in the transporting direction T is equal to the transporting speed V, so that there is no distortion of the tube walls 10a, 10b can come.
• the two suction devices 13, 14 start to move away from one another transversely to the transport direction V (arrows PI or P2), each entraining a hose wall 10a, 10b and thereby open the end region 10e of the tubular bag body 10.
• the suction devices 13 , 14 in the oblique direction S can be the point of application of the suction devices 13, 14 on the tube walls 10a, 10b control with respect to the Bodenmittenline lOj and even adjusted during operation, whereby the opening device 1 at different lengths end portions formed to different widths bag floors be customizable.
• the attack points of the suction devices 13, 14 to be separated at the tube walls 10a, 10b to be adjusted so that they are as close to the outer end of the bag body, whereby the precision of the opening operation is increased. It does not matter whether or not the end portion 10e is folded before opening along the bottom center line 10j with respect to the remaining bag body 10 (as shown here). If the end region 10e were not yet folded during opening, that is to say if it were still in the plane ⁇ , then the opening device would be arranged rotated so that the suction devices would engage from above and below. It only needs to be ensured that at least part of the end region 10e is free.
• FIG. 3 shows the end region 10e of the tubular bag body 10 in the opened state, in which a free space 10g is formed between the tube walls 10a, 10b. It can also be seen in this illustration that in the meantime the vacuum has been switched off by the suction devices 13, 14 and the two suction devices 13, 14 have disengaged from the hose walls 10a, 10b and can therefore be moved back in the oblique direction S. to be opened for opening the end portion of the next bag body.
• the further processing of the end region 10e for the formation of the soil takes place at a downstream of the bottom opening device processing station, which is schematically indicated in Figure 3 generally with 19 and is not the subject of the present invention.
• reference numeral 20 denotes a bottom opening unit as part of the opening device 1 according to the invention.
• This bottom opening unit 20 is shown in a perspective view in FIG. 4, in a somewhat simplified bottom view in FIG. 5 and in a schematic side view in FIG. 6.
• the suction devices 13, 14 are each arranged on a holder 3 and facing each other. Since the bottom opening unit 20 is constructed largely symmetrical, the relevant components are hereinafter called only once for the purpose of description. However, it is obvious that components of each side not described are identical in construction and function.
• the holder 3 is pivotally connected to first ends of two parallel pivot arms 4, 5, of which at least one (here the pivot arm 4) is driven to be pivotable transversely to the transport direction T.
• the second ends of the pivot arms 4, 5 are pivotally connected to a carrier carriage 7, which carrier carriage 7 is driven to move back and forth in a guide rail 22 in the oblique direction S.
• the bottom opening unit 20 is fixed to a support 30 so that the guide rail 22 is aligned in the transport direction T and parallel to the oblique direction S (see FIG. 6).
• the holder 3, the two pivot arms 4 and 5 and the carrier slide 7 form a parallelogram unit 8, in which the parallelogram configuration is maintained during pivoting.
• the pivoting of the pivot arms 4 and 5 takes place in the apparatus according to the invention shown in FIG 4 via an attached to the pivot arm 4 angle lever 23 which is connected to a rod 9 which is articulated to a control carriage 21.
• the control carriage 21 is mounted in the guide rail 22 to move back and forth.
• the carrier carriage 7 and the control carriage 21 are driven by means of a toothed belt drive 24, 25.
• FIG. 4 it can further be seen that in the opening unit 22 for the adjustable mounting of the guide rail 22, elongated holes 27 with recesses 28 are formed.
• the line AI is parallel to the longitudinal axis of the guide rail 22 and parallel to the oblique direction S, whereby the guide rail 22 together with the control slide 21, the carrier carriage 7, the linkage 9, the Parallelogrammtechniken 8 and arranged thereon suction devices 13 and 14 at an angle ⁇ are moved to the bottom center line lOj or plane ⁇ , which allows the precise opening of different width bag bodies 10. It is important here that the guide rail 22 is parallel to the oblique direction S. To change the angle cc, the bottom opening unit 20 is screwed with its upper recesses 28 on the support 30, whereby two bearing points are defined, which are interconnected by the line A2.

Landscapes

• Supplying Of Containers To The Packaging Station (AREA)
• Bag Frames (AREA)
• External Artificial Organs (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=47002662

Family Applications (1)

Country Status (7)

Families Citing this family (3)

Citations (2)

Family Cites Families (9)

• 2012
  • 2012-09-24 ES ES12185656.1T patent/ES2592534T3/es active Active
  • 2012-09-24 EP EP12185656.1A patent/EP2711164B1/fr active Active
• 2013
  • 2013-09-04 WO PCT/EP2013/068303 patent/WO2014044532A1/fr not_active Ceased
  • 2013-09-04 CN CN201380049509.9A patent/CN104812561B/zh active Active
  • 2013-09-18 TW TW102133905A patent/TWI477424B/zh active
• 2015
  • 2015-03-13 PH PH12015500558A patent/PH12015500558A1/en unknown
  • 2015-04-02 IN IN2703DEN2015 patent/IN2015DN02703A/en unknown

Patent Citations (2)

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