WO2007009768A1 - Appareil et procede de production d'un sac tubulaire - Google Patents

Appareil et procede de production d'un sac tubulaire Download PDF

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Publication number
WO2007009768A1
WO2007009768A1 PCT/EP2006/007102 EP2006007102W WO2007009768A1 WO 2007009768 A1 WO2007009768 A1 WO 2007009768A1 EP 2006007102 W EP2006007102 W EP 2006007102W WO 2007009768 A1 WO2007009768 A1 WO 2007009768A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
film
length
motion
segment
Prior art date
Application number
PCT/EP2006/007102
Other languages
English (en)
Inventor
Frank Theodorus Catharina Caris
Rudolf Adrianus Van Gulik
Peter Joseph Hendriks
Original Assignee
Cfs Weert B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cfs Weert B.V. filed Critical Cfs Weert B.V.
Publication of WO2007009768A1 publication Critical patent/WO2007009768A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • B65B57/02—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages
    • B65B57/04—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages and operating to control, or to stop, the feed of such material, containers, or packages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B41/00—Supplying or feeding container-forming sheets or wrapping material
    • B65B41/18—Registering sheets, blanks, or webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • B65B51/303—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes reciprocating along only one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/213—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles the web having intermittent motion

Definitions

  • the present invention relates to a process for the cyclic production of packaging bags from a planar web, on a bagging machine which comprises detection means for the detection of print-marks which are located on the web and control means to control the motion of the film-web, whereas: the web is formed into a film tube, the web is transported by transportation means intermittently, so that the velocity of the web is zero between at the beginning and at the end of each motion of the film-web.
  • Packaging bags made of a plastic material.
  • the packaging bags are produced by forming a planar web, whereas the planar web is drawn from a roll, formed into a tube and a longitudinal seal is applied. Subsequently, the tube is cross-sealed at the bottom, the food stuff is inserted and another cross seal is applied at the top of the packaging bag and the completed packaging bag is cut from the tube.
  • these packaging bags are produced intermittently; i.e. the web is advanced and stopped in cycles.
  • the produced packing items have imprints and print-marks to control the packaging process. These print- marks determine the respective length of each bag. Theoretically, the distance between two print-marks is always identical.
  • inventive process allows the reproducible production of bags with a length deviation within a small bandwidth.
  • the regulation of the production process does not take place after defective packaging bags have been produced, but during the production process of each packaging bag. i.e. if the print-mark is not located as expected, the production of this packing item will be altered such that this and the following packaging bags are not defective goods.
  • inventive process allows, at the end of each motion of the film-web, a controlled reduction of the motion of the film-web to zero without any shock. Thus, oscillations of the packaging machine on which the inventive process is carried out are minimized. Additionally, the web stability is improved, which improves the quality and the reproducibility of the produced packaging bags and allows higher production rates.
  • the inventive process can be carried out on every intermittently operating packaging machine, regardless how the film-web is transported along the packaging machine.
  • the inventive process is preferably carried out on a vertical packaging machine, for example a vertical flow-wrapper.
  • a vertical packaging machine On such a packaging machine, a flat film-web is drawn off a role, formed into a tube. At this tube a longitudinal seal and at the bottom a cross -seal is applied. After the packing bag has been filled via a filling tube, another longitudinal seal is applied at the top of the packaging bag and the completed packaging bag is cut off the film-web. In many cases, the cross-seals at the top of one packaging bag and the cross seal at the bottom of the next packaging bag are applied simultaneously and then cut apart.
  • the film-web is moved by transportation means.
  • These transportation means can be endless bands, which are positioned adjacent to the filling tube and which draw the film preferably downwards.
  • the film web is moved by the cross sealing means, which apply the cross-seals to the film-tube.
  • These cross sealing means comprise two jaws, between which the film is clamped during the sealing. While the film is clamped, the sealing jaws are moved for example downwards and thus draw the web from the role. After the sealing/drawing is completed, the sealing jaws are moved apart and back to their starting position and start the next cycle.
  • the packaging machine comprises detection means, for example a photocell, to detect print marks which are located on the web. These print marks can be printed on the web.
  • the print mark can be any other means that is detectible, for example a transponder, a metal strip or the like.
  • the print-marks are theoretically located at set intervals in the direction of motion of the web. However, the distance between two print marks is not always identical so that the actual distance between two print marks is different from the theoretical distance The distance between two print-marks determines the length of the respective packaging bag.
  • the set length of the packaging bag I is virtually divided into two segments S 1 and S 2 , comprising the set length I 1 , 1 2 , respectively.
  • the two segments are separated by a print-mark.
  • the velocity profile V 1 of the film-web is always identical for a given packaging bag.
  • the velocity V 1 is zero and then increases until it reaches a certain value.
  • the velocity preferably remains at this certain or another value until the print mark is detected by the detection means.
  • the control means calculate the actual length I 1 ' between the beginning of the motion and the detection of the print-mark and if I 1 ' differs from I 1 the velocity profile V 2 in the second segment S 2 is altered to the velocity profile V 2 ' .
  • the velocity profile starts right after the detection of the print-mark and reduces the velocity of the film-web from the certain value to zero. If I 1 ' is equal to I 1 , this will be achieved by a predetermined velocity profile V 2 . However, if I 1 ' is not equal to I 1 , due to tolerances during the production of the web or due to length tolerances of the packing bags produced previously, the velocity profile v 2 ' is altered accordingly.
  • the velocity profile v 2 ' is altered such that the length of the respective packaging bag is equal to the sum I 1 ' +I 2 .
  • the length I 2 of segment S 2 is constant for a given packaging bag.
  • the detection means preferably measure the length I 1 ' until it detects the next print-mark, which is the actual length I 1 ' of segment S 1 and the control means compares I 1 ' with the set length I 1 and if I 1 ' and I 1 are not equal, the velocity profile V 2 is modified such that the velocity of the web is zero at the end of segment S 2 .
  • the actual length I ' of the packaging bag is different from the set length I, if W differs from I 1 .
  • the acceleration of the web is zero. More preferably, at the beginning and the end of each motion of the film-web, the impulse of the web is zero.
  • each cycle cross seal is applied.
  • cross seals are applied by cross-sealing means during the motion of the web, whereas even more preferably, the cross sealing means are also the transportation means.
  • the film is clamped during the sealing by sealing jaws. While the film is clamped, the sealing jaws are moved and thus draw the web from the role. After the sealing/drawing is completed, the sealing jaws are moved apart and transported back to their starting position again and the next cycle starts.
  • the sealing means are also the transportation means for the film web.
  • inventive process can also be carried out on a packaging machine with transportation belt or any ozher means to transport the film intermittently.
  • Figure 1 a packaging bag.
  • Figure 2 a scheme of a vertical form fill packaging bag machine.
  • FIG. 3 an illustration of the inventive process.
  • Figure 4 curves regarding the motion of the film.
  • Figure 1 shows a packaging bag 3 which can be filled with a packaging item (not depicted).
  • the person skilled in the art understands that a large variety of different packaging bags can be produced according to the inventive process.
  • the packaging is made from a film tube 10 and comprises a longitudinal seal 4 and a cross-seal 1 at its top and a cross-seal 2 at its bottom.
  • a vertical form-fill-seal packaging machine i. e. a vertical flow rapper is systematically depicted, which allows for example the production of the packaging bag 3 according to Figure 1.
  • a web of a film 7, especially a sealable plastic film 7, is supplied by rolls (not shown) of film material.
  • the film-web 7 is then shaped by a forming shoulder 6 to provide a rather tubular form to the material.
  • tubular form of the packaging bags or of the film means any cross-sectional form including a circular form or another form, and especially a rectangular or generally a polygonal form.
  • the film tube 10 is shaped around a filling tube 8 through which the packaging items are filled into the packaging bags 3.
  • the vertical flow wrapper further comprises longitudinal sealing means 11 in order to produce the longitudinal seal 4 of the bag.
  • cross seals 1 , 2, extending perpendicularly (or transversally) to the direction of flow of the film, are applied, especially by means of cross-seal jaws 12, 13.
  • the cross seal jaws 12, 13 further comprises cutting means which separate the completed bags.
  • the cross sealing means 12, 13 can be moved horizontally as depicted by arrows 14 and vertically, as depicted by arrow 15 from a upper dead center 16, to a lower dead center 17 and back. In the top- and in the lower dead center the velocity of the sealing means is zero, respectively.
  • the cross sealing jaws 12, 13 are first vertically moved and then pressed together until enough pressure is applied to apply the cross seal and to clamp the film tube. Subsequently, the sealing jaws are moved downwards as depicted by arrow 15, from its upper dead center to its lower dead center. Since the film tube is clamped and due the downward movement of the cross seal jaws, the film is pulled downwards. At the lower dead center, the cross seal jaws are opened and moved upwards again, so that the next sealing/transportation-cycle can begin. During the clamping and the downward motion, the tube 10 is cross sealed. In Figure 3, the inventive process is depicted. The film web 7 is transported from the right to the left.
  • a photocell 19 is located in a distance I f , which is in the present example 20 mm, downstream of the next print-mark 18; i.e. after the web has started to move the photocell expects to see a pint-mark after the film has moved 20 mm.
  • the length I of the film material needed is separated into two segments s-i, S 2 , which have a set length I 1 , 1 2 , respectively and which are separated by a printmark (18, 18 ' , 18 " ).
  • the first, very left, example shows an ideal situation; i.e.
  • the film-web 7 moves according to the preset velocity profile V 1 ; i.e. the velocity increases gradually until it reaches a certain speed.
  • the photocell 19 detects the print-mark 18. This situation is illustrated with the word "photocell”.
  • the film is advanced according to the preset velocity profile V 2 ; i.e. the speed is maintained at a certain value for a while and then reduced asymptotically to zero after the film web has by-passed the distance I 2 , which is in the present example 30 mm.
  • the photocell 19 does not detect the print-mark 18 ' after the set-length I 1 (20mm), but only after the actual length I 1 ' (22 mm). This situation is illustrated with the word " no photocell". In this case, the velocity of the the film-web 7 is maintained constant at a certain value and the photocell waits until it detects the print-mark 18 ' . Subsequently, the control means (not depicted) calculates the difference between I 1 and I 1 ' . Based on this information the control means know that the packaging bag presently under production cannot have the set length I, but must have the actual length I ' , which can be longer or shorter.
  • the inventive control process has the advantage, that the adjustment of the length of the packaging bag takes place, while it is produced and that the control means calculate a new velocity profile V 2 ' to reduce the velocity to zero in a controlled manner at the adjusted length I ' of packaging bag.
  • the adjustment of the velocity profile is depicted in the graph on the lower left-hand aide.
  • the inventive process allows a significant reduction of the oscillations in the system and thus higher production rates and an increased film stability.
  • the next example shows an ideal situation again; i.e. the set-parameters and the actual parameters match perfectly.
  • FIG 4c the acceleration versus the time during the motion of the film-web is depicted.
  • the acceleration is the second derivate of the curve according to Figure 4a. In the vicinity of the beginning and at the end of the downward movement, the acceleration is zero, respectively.
  • the impulse which is the third derivative of the curve according to Figure 4a and which is depicted in Figure 4d. Due to this design of the motion of the film web according to Figures 4a-d, there is very little oscillation in the system due to the intermittent operation of the packaging machine on which the packaging bags are produced. Thus the production rate can be increased.
  • V 2 set velocity profile in the second segment
  • V 2 actual velocity profile in the second segment

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)

Abstract

La présente invention concerne un procédé de production cyclique de sacs d'emballage (3) à partir d'un voile plan (7) par une ensacheuse. Celle-ci comporte un détecteur (19) de marques imprimées (18, 18', 18') sur le voile et un contrôleur pour commander le déplacement du voile de film (7). En l'occurrence, la machine forme le tube à partir du film, puis en assure un transport intermittent de façon que la vitesse d'avance du voile soit nulle entre le début et la fin de chaque déplacement du voile de film (7).
PCT/EP2006/007102 2005-07-19 2006-07-19 Appareil et procede de production d'un sac tubulaire WO2007009768A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP05015643.9 2005-07-19
EP05015643 2005-07-19
EP05025729A EP1746026A1 (fr) 2005-07-19 2005-11-25 Dispositif et procédé pour fabriquer un sachet tubulaire
EP05025729.4 2005-11-25

Publications (1)

Publication Number Publication Date
WO2007009768A1 true WO2007009768A1 (fr) 2007-01-25

Family

ID=36968159

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/007102 WO2007009768A1 (fr) 2005-07-19 2006-07-19 Appareil et procede de production d'un sac tubulaire

Country Status (2)

Country Link
EP (1) EP1746026A1 (fr)
WO (1) WO2007009768A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3350840A (en) * 1963-02-18 1967-11-07 Hesser Ag Maschf Packaging machine
EP0274849A1 (fr) * 1986-12-15 1988-07-20 Kliklok Corporation Appareil et procédé pour alimenter un film d'emballage
EP0348065A1 (fr) * 1988-06-20 1989-12-27 Hayssen Manufacturing Company Système et procédé pour le contrôle d'un dispositif de scellage d'emballages

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3350840A (en) * 1963-02-18 1967-11-07 Hesser Ag Maschf Packaging machine
EP0274849A1 (fr) * 1986-12-15 1988-07-20 Kliklok Corporation Appareil et procédé pour alimenter un film d'emballage
EP0348065A1 (fr) * 1988-06-20 1989-12-27 Hayssen Manufacturing Company Système et procédé pour le contrôle d'un dispositif de scellage d'emballages

Also Published As

Publication number Publication date
EP1746026A1 (fr) 2007-01-24

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