WO2003000554A1 - Mecanisme a souder les sacs - Google Patents

Mecanisme a souder les sacs Download PDF

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Publication number
WO2003000554A1
WO2003000554A1 PCT/US2002/014569 US0214569W WO03000554A1 WO 2003000554 A1 WO2003000554 A1 WO 2003000554A1 US 0214569 W US0214569 W US 0214569W WO 03000554 A1 WO03000554 A1 WO 03000554A1
Authority
WO
WIPO (PCT)
Prior art keywords
bag
pair
rollers
fold
sealing
Prior art date
Application number
PCT/US2002/014569
Other languages
English (en)
Inventor
James Mcgregor
Scot Berkley
Kenneth R. Hancock
Robert Hart
Original Assignee
James Mcgregor
Scot Berkley
Hancock Kenneth R
Robert Hart
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 James Mcgregor, Scot Berkley, Hancock Kenneth R, Robert Hart filed Critical James Mcgregor
Priority to EP02780868A priority Critical patent/EP1392565A1/fr
Publication of WO2003000554A1 publication Critical patent/WO2003000554A1/fr

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10Applying or generating heat or pressure or combinations thereof
    • B65B51/14Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • B65B51/146Closing bags
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/32Cooling, or cooling and pressing, package closures after heat-sealing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00Closing containers or receptacles after filling
    • B65B7/02Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks
    • B65B7/06Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks by collapsing mouth portion, e.g. to form a single flap
    • B65B7/08Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks by collapsing mouth portion, e.g. to form a single flap and folding

Definitions

  • the present invention relates to a bag sealing mechanism used in an automated bag filling and sealing machine. More specifically, the present invention relates to a mechanism for activating a heat sensitive adhesive and for compressing a bag top so that the heat sensitive adhesive will securely hold the bag top shut.
  • Paper bags and paper bags having plastic or other waterproof liners are typically sealed or closed in an automated bag filling machine using a heat sensitive adhesive.
  • the adhesive is usually applied to the bags prior to the filling operation and must be heated to become active so that it may properly seal a bag top shut.
  • the activation of such an adhesive is a difficult proposition.
  • various types of bag sealing mechanisms have used, for example, convection heating devices that played a stream of hot air onto the heat sensitive adhesive, or used radiant devices that emitted infrared energy to activate the adhesive. While functional, each of these aforementioned types of sealing mechanisms require a great deal of attention and care in implementation, primarily due to fire hazards. Moreover, they also require substantial and continual monitoring and adjustment to ensure their continued and proper operation. Therefore, there is a recognized need for a simplified mechanism for activating a heat sensitive adhesive in an automated bag filling and closing system.
  • the bag sealing mechanism of the present invention comprises a pair of opposable forming bars, a pair of opposable sealing bars, a fold-over arm, and an optional pusher bar.
  • the opposable forming bars are constructed and arranged to grasp and hold the top end of a filled bag during the sealing process.
  • One of the opposable sealing bars comprises a resilient, heat resistant platen, while the other, opposable sealing bar comprises a creasing, or knife edge.
  • the opposable sealing bars are moveable between a first, inoperative position and a second, operative position in which the knife edge crimps the top of a filled bag against the platen and forms a flap.
  • the fold-over arm of the present invention is coupled to the first sealing bar and is moveable along a predetermined path between a first, inoperative position, and a second, operative position in which the fold-over bar operatively contacts the flap formed in the bag by the second sealing bars, and folds the flap so that it comes into contact with a heat sensitive adhesive that has previously been applied to a predetermined area of the bag below the crimp.
  • the fold-over arm incorporates a heating element that is constructed and arranged to maintain the fold-over arm at a temperature that is sufficient to activate the heat sensitive adhesive.
  • the fold over arm may also have discrete areas having varying coefficients of heat transfer. In one embodiment these areas are adapted as strips that run the length of the fold over arm to engage the entire width of the bag top. In another embodiment the discrete areas comprises a number of sections, that when lined up next to one another, make up the entire width of the fold over arm.
  • the sealing bar to which the fold-over arm is coupled may also comprise a resilient platen that is arranged to back up the fold-over arm as it compresses a folded-over bag top. This resilient platen may be uniformly resilient across the width of the bag top, or may have varying resiliencies across the width of the bag top. In one embodiment the platen is applied to a layer of resilient material having varying resiliency. In another embodiment, the platen is mounted upon a spring biased mechanism having varying resiliencies. In yet another embodiment the platen is made of a uniform material but has a thickness that varies across the width of a bag top.
  • the optional pusher bar is mounted immediately below the knife edge on the second sealing bar.
  • the pusher bar is offset rearwardly from the knife edge a sufficient distance to avoid interfering with the knife edge's crimping action.
  • the pusher bar compresses the flap against the platen of the sealing bar to ensure optimal adhesion by the heat activated adhesive between the folded over bag portions.
  • the present invention also comprises a method of sealing a bag top comprising the steps of grasping a filled bag, crimping the top of the filled bag to create a flap and to bias the flap towards the face of the bag, folding and pressing the flap so that it comes into contact with the face of the bag while simultaneously applying heat to activate a heat sensitive adhesive disposed therebetween, and maintaining pressure on the folded over portion of the bag top to allow the heat activated adhesive to sufficiently cure.
  • the step of maintaining pressure may be omitted.
  • a pair of forming bars comprising a pair of rollers may be used. The rollers are mounted on the respective opposed forming bars. One of the pair of rollers is an idler and is free to rotate.
  • the other of the pair of rollers is constrained to selectively rotate. Where the second roller is stationary, the pair of rollers are capable of firmly grasping and holding a bag therebetween when the rollers are addressed to the bag. Once the necessary operations have been completed, the bag is released by allowing the second of the pair of rollers to rotate such that the bag will pass downward through and out of the rollers.
  • Figure 1 is a cutaway side elevation view of a bag handling and sealing mechanism having a filled bag positioned therein;
  • Figure 2 is a cutaway close up side view of the bag of Figure 1 having its top crimped between a pair of sealing bars;
  • Figure 3 is a cutaway close up side view of the bag of Figure 1 wherein the bag top is being folded over into contact with the bag face;
  • Figure 4 is a cutaway close up side view of the bag of Figure 1 wherein an optional pusher bar firmly presses against the folded over bag top to cool the heat sensitive adhesive so as to ensure that the bag top is securely closed;
  • Figure 5 is a cutaway close up side view of the forming bars and their attendant rollers shown grasping a filled bag therebetween;
  • Figure 6 is a front view of a sealing bar alternate embodiments of the fold- over arm and platen;
  • Figure 7 is a front elevation of a gusseted bag.
  • Figure 8 is a perspective view of a fold-over arm having a plurality of metallic strips formed in its operative face.
  • Figure 1 illustrates a bag B captured in a bag handling and sealing mechanism 5.
  • a more complete description of the bag handling and sealing mechanism 5 as it is used in conjunction with a bag filling machine (not shown) is set forth in U.S. Patent Application 09/409,099, filed on 30 September 1999, and hereby incorporated by reference.
  • the bag top 8 is intended to be crimped in a line from side to side, indicated at 9 such that when the bag top 8 is crimped, a flap F is formed.
  • This flap F is subsequently folded over into contact with the body of the bag B therebelow (also referred to as the face of the bag), and secured thereto by a layer of adhesive A.
  • adhesive A may be applied above or below the crease line 9.
  • the bag handling and sealing mechanism 5 comprises a pair of movable sealing bars 10, 12 that are in an opposing relation.
  • Sealing bar 10 comprises a resilient and heat resistant pad 14 that serves as a platen that opposes a knife or creasing edge 16 of sealing bar 12.
  • the sealing bars 10, 12 act to crimp the bag top 8 as it is being held between a pair of forming bars 18a, 18b. In crimping the bag top 8, the sealing bars 10, 12 move from a first, inoperative position in which the bars 10, 12 are out of contact with the bag top 8 to a second, operative position in which the bag top 8 is firmly clamped between the knife edge 16 of sealing bar 12 the resilient pad 14 of sealing bar 10. See Figure 2.
  • the clamping pressure placed upon the bag top 8 by the knife edge 16 and resilient pad 14 crimp the bag top 8 at line 9 to form a flap F, which is biased towards the body or face of the bag B.
  • Sector arm or fold-over arm 20 is moveably mounted to sealing bar 10 for the purpose of folding the biased flap F over into contact with the face of the bag B.
  • the fold-over arm 20 travels along a predetermined path between a first, inoperative position in which the fold-over arm 20 is moved out of contact with the bag flap F, and a second, operative position in which the fold-over arm 20 is moved into operative contact with the flap F of the bag top 8 so as to fold the flap F over and into contact with the body or face of the bag B. See Figure 3.
  • Fold-over arm 20 is moved between its first and second positions by a chain linkage 23 having a chain 23a that is passed around sprockets 23b, 23c, and 23d.
  • the fold-over arm 20 includes a heating element 22 that heats the working, curved surface 21 of the fold-over arm to a predetermined temperature in the neighborhood of 300° Fahrenheit. Note that the exact temperature can vary depending upon the nature of the heat sensitive adhesive applied to the bag, the bag material, the size of the bag, etc.
  • the heat emanating from the working surface 21 of the fold-over arm 20 heats the adhesive A and begins the process of sealing the bag B. However, because the adhesive A remains relatively weak when in its activated state, it is desirable to maintain the flap F of the bag top 8 in its folded-over position against the bag face B, while the adhesive A cools down and sets up.
  • the adhesive A will be disposed in such a manner as to seal the bag Flap F in its closed position.
  • FIG 4 the fold-over arm 20 has been moved back to its first, inoperative position and sealing bar 12 has again addressed the bag top 8.
  • a pusher bar 30 is operatively connected to the sealing bar 12 immediately below the knife edge 16 and is slightly rearwardly offset with respect to the knife edge 16. This rearward offset permits the knife edge 16 to properly crimp the bag top 8 at line 9 without interference from the pusher bar 30.
  • Pusher bar 30 has a two-fold purpose. First, the pusher bar 30 clamps the bag flap F in its folded-over, sealed position. Second, the pusher bar 30 acts as a heat sink that cools the adhesive A so that it can become sufficiently tacky to maintain the bag flap F in its folded-over, sealed position. Note that the pusher bar 30 is not a necessary part of the present invention and where an adhesive with a relatively short setting or cure time is used, it may be possible and desirable to omit the pusher bar 30.
  • a folded over bag top may be approximately four times the thickness of a single ply of the bag material at its center and eight times the thickness of a single ply of the bag material at its edges where the gussets are located when the bag top is folded over for sealing.
  • a solid fold-over arm 20 may place an uneven pressure on the bag flap as it is being folded over, and the pressure on the lateral portions of the bag top where the gussets G are located would be subject to much higher pressures than the middle portion of the bag away from the gussets. Because higher pressure upon the adhesive A has the effect of lowering its activation temperature, the higher pressure imparted by a solid fold-over arm 20 can, in some instances, cause portions of the heat activated adhesive to be substantially squeezed out of contact with the flap and the face of the bag. In addition, the adhesive A may also be negatively affected by the application of too much heat. As can be appreciated, such squeeze-out can easily foul-up the fold-over arm 20 and may even cause failure of the glue joint at the bag top. Likewise, too much heat applied to the adhesive A may cause the glue joint to fail.
  • the resilient pad or platen 14 of sealing bar 10 may be mounted upon a spring biased mechanism (not shown) that would limit, by means of the selection of an appropriate spring coefficient, the maximum pressure that could be applied to the bag top by the fold-over arm 20.
  • the resilient pad 14 may be formed as a unitary structure, or may be formed as individual sections 14a (see, Figure 6).
  • a suitable spring biased mechanism may comprise an additional layer of resilient materials having varying spring coefficients or a mechanical spring mechanism wherein each section 14a is mounted upon a spring or springs having suitable spring coefficients.
  • the spring biased mechanism supporting the pad 14 will be constructed and arranged to yield to pressure above a given set point as with the single pad 14 of figure 5, or at a plurality of given set points as with the sectional pads of figure 6.
  • the spring biased mechanism supporting the pad 14 will be constructed and arranged to yield to pressure above a given set point as with the single pad 14 of figure 5, or at a plurality of given set points as with the sectional pads of figure 6.
  • the increased thickness of the gussets G may act as a heat sink, it may be necessary to apply greater pressure to the bag top 8 over the gussets G.
  • the middle portion of the bag top is thinner, less pressure is needed. It is to be understood that by tailoring the pressures and temperature applied by the fold-over arm 20, uniform activation of the adhesive A may easily be achieved along the width of the bag top without damaging the bag top or the adhesive itself.
  • the purpose of the fold-over arm 20 is two fold: to fold over the flap a bag and to simultaneously activate the heat sensitive adhesive that will seal the bag closed.
  • the increased thickness of the folded over bag top can make it difficult to activate the adhesive. This is especially true for the adhesive that is to seal the bag top under the gussets of the bag.
  • a given dwell time (or heating cycle) of the fold-over bar 20 against the folded over bag flap may be sufficient to activate the adhesive in the middle portion of the bag flap, that same dwell time may not give the fold-over arm 20 sufficient time to heat the adhesive under the gussets to its activation temperature.
  • the fold-over arm 20 may be divided into a plurality of sections 40 that together extend across the entire length of the fold-over arm 20. See Figure 6.
  • the sections of the fold-over arm 20 overlying the gusseted portions of the bag top will be arranged to have a higher coefficient of thermal conduction than those portions of the fold-over arm 20 that are near the middle portion of the bag.
  • the gusseted portions of the bag top will receive more heat than the middle portion of the bag, thereby activating the adhesive in the thicker gusseted portions of the folded-over bag top, while activating the adhesive in the middle portion of the folded over bag top without burning or otherwise negatively affecting the middle portion.
  • the exact composition and size of the various sections of the fold-over arm may vary depending upon the application and the type of bag being sealed.
  • rollers 100a, 100b of forming bars 18a, 18b are coupled to the operative faces of the forming bars 18a, 18b, respectively, rather than the more typical tongue-in-groove structure that has been traditionally used.
  • Roller 100a is an idler and is free to rotate whereas roller 100b is constrained to rotated in a controlled manner.
  • Roller 100b may be driven by an air cylinder, a chain drive, a gear drive, or by any suitable mechanism. In operation the rollers 100 are moved into engaging contact with a bag B by the forming bars 18a, 18b to firmly grasp the bag B therebetween. Roller 100b is constrained not to rotate so long as the bag B is grasped therebetween.
  • roller 100b After bag B has been sealed, as by fold-over arm 20, roller 100b is caused to rotate, in Figure 7 in a counter clockwise direction indicated by arrow 101 , so that bag B will pass between the rollers 100 and subsequently from between the forming bars 18.
  • the action of rollers 100 on the folded over bag top is to firmly press the flap into contact with the heat activated adhesive between the flap and the body or face of the bag.
  • the use of the rollers 100a, 100b may obviate the need for a pusher bar 30 as the rollers 100a, 100b act in that same capacity.
  • Figure 8 illustrates a preferred embodiment of the fold over bar 20.
  • the fold- over bar 20 illustrated in Figure 8 comprises three metallic strips 20a, 20b, and 20c in its working, curved surface 21.
  • Each of the strips 20a, 20b, and 20c has a different coefficient of heat transfer. Since the dimensions of the strips 20a, 20b, and 20c are more or less the same, the amount of heat that will be transmitted from the heating element 22 to the bag B by each of the metallic strips 20a, 20b, 20c will vary for a given dwell time.
  • strip 20a is fabricated of copper, strip 20b of aluminum, and strip 20c of stainless steel.
  • any overheating that may take place in the bag B will not cause the adhesive A between the flap and the body of the bag to be burned or squeezed from between the fold of the bag top. It is to be understood that any number of strips 20a-20c may be used and that the specific material from which they strips are made and their exact configuration may vary from application to application.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Package Closures (AREA)
  • Making Paper Articles (AREA)

Abstract

L'invention concerne un mécanisme à fermer un sac rempli. Le mécanisme comprend une barre plieuse chauffée (20) qui plie la partie supérieure d'un sac en position fermée et applique simultanément de la chaleur sur cette partie supérieure repliée de façon à activer un adhésif thermosensible (A) disposé entre le segment replié de la partie supérieure du sac. Une barre directrice (30) est conçue et disposée de manière à comprimer la partie supérieure repliée du sac pour refroidir l'adhésif thermosensible.
PCT/US2002/014569 2001-05-04 2002-05-06 Mecanisme a souder les sacs WO2003000554A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02780868A EP1392565A1 (fr) 2001-05-04 2002-05-06 Mecanisme a souder les sacs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US28903701P 2001-05-04 2001-05-04
US60/289,037 2001-05-04

Publications (1)

Publication Number Publication Date
WO2003000554A1 true WO2003000554A1 (fr) 2003-01-03

Family

ID=23109749

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/014569 WO2003000554A1 (fr) 2001-05-04 2002-05-06 Mecanisme a souder les sacs

Country Status (2)

Country Link
EP (1) EP1392565A1 (fr)
WO (1) WO2003000554A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1818263A1 (fr) * 2006-02-10 2007-08-15 TEEPACK SPEZIALMASCHINEN GMBH & CO. KG Procédé pour emballer des produits et son usage dans une machine correspondante

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2006060A (en) * 1933-01-21 1935-06-25 Fred Goat Co Inc Siftproof package and method of making the same
US2011198A (en) * 1932-04-23 1935-08-13 Grace H Emery Container folding mechanism
US2175557A (en) * 1937-06-29 1939-10-10 Cons Packaging Machinery Corp Bag closing machine
US2257243A (en) * 1938-05-23 1941-09-30 Meyer-Jagenberg Gunther Method and apparatus for closing paper containers
US2364543A (en) * 1941-10-31 1944-12-05 Cons Packaging Machinery Corp Method of forming siftproof bag closures
US2608333A (en) * 1949-06-28 1952-08-26 Marziani Joseph Evacuating and heat-sealing machine
US2641882A (en) * 1949-12-02 1953-06-16 Niagara Packaging Machinery Co Bag packaging machine
US3063890A (en) * 1959-11-16 1962-11-13 Pneumatic Scale Corp Apparatus for and method of sealing thermoplastic tubes
US3874708A (en) * 1973-06-25 1975-04-01 H E Wiese Inc Flexible pipe connector for machinery protection
US4019305A (en) * 1973-07-16 1977-04-26 Colgate-Palmolive Company Methods and apparatus for foldably closing the ends of laminated metal-plastic tubes
US5448879A (en) * 1992-10-27 1995-09-12 Concetti S.P.A. Automatic machine for forming, filling and sealing sacks and the like
US5819509A (en) * 1995-01-06 1998-10-13 Mcgregor; Harold Bag shouldering and deaerating apparatus
US6094895A (en) * 1997-12-17 2000-08-01 Ravizza Packaging S.R.L. Method and apparatus for the packaging of articles within flexible material bags

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2011198A (en) * 1932-04-23 1935-08-13 Grace H Emery Container folding mechanism
US2006060A (en) * 1933-01-21 1935-06-25 Fred Goat Co Inc Siftproof package and method of making the same
US2175557A (en) * 1937-06-29 1939-10-10 Cons Packaging Machinery Corp Bag closing machine
US2257243A (en) * 1938-05-23 1941-09-30 Meyer-Jagenberg Gunther Method and apparatus for closing paper containers
US2364543A (en) * 1941-10-31 1944-12-05 Cons Packaging Machinery Corp Method of forming siftproof bag closures
US2608333A (en) * 1949-06-28 1952-08-26 Marziani Joseph Evacuating and heat-sealing machine
US2641882A (en) * 1949-12-02 1953-06-16 Niagara Packaging Machinery Co Bag packaging machine
US3063890A (en) * 1959-11-16 1962-11-13 Pneumatic Scale Corp Apparatus for and method of sealing thermoplastic tubes
US3874708A (en) * 1973-06-25 1975-04-01 H E Wiese Inc Flexible pipe connector for machinery protection
US4019305A (en) * 1973-07-16 1977-04-26 Colgate-Palmolive Company Methods and apparatus for foldably closing the ends of laminated metal-plastic tubes
US5448879A (en) * 1992-10-27 1995-09-12 Concetti S.P.A. Automatic machine for forming, filling and sealing sacks and the like
US5819509A (en) * 1995-01-06 1998-10-13 Mcgregor; Harold Bag shouldering and deaerating apparatus
US6094895A (en) * 1997-12-17 2000-08-01 Ravizza Packaging S.R.L. Method and apparatus for the packaging of articles within flexible material bags

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1818263A1 (fr) * 2006-02-10 2007-08-15 TEEPACK SPEZIALMASCHINEN GMBH & CO. KG Procédé pour emballer des produits et son usage dans une machine correspondante

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Publication number Publication date
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