WO2002012064A1 - Method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener - Google Patents
Method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener Download PDFInfo
- Publication number
- WO2002012064A1 WO2002012064A1 PCT/US2001/041463 US0141463W WO0212064A1 WO 2002012064 A1 WO2002012064 A1 WO 2002012064A1 US 0141463 W US0141463 W US 0141463W WO 0212064 A1 WO0212064 A1 WO 0212064A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- web
- fastener
- bag
- sealing
- forming
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000004033 plastic Substances 0.000 title claims abstract description 22
- 229920003023 plastic Polymers 0.000 title claims abstract description 22
- 239000002985 plastic film Substances 0.000 claims abstract description 17
- 229920006255 plastic film Polymers 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims description 45
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 238000012432 intermediate storage Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000005021 flexible packaging material Substances 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 239000012775 heat-sealing material Substances 0.000 description 1
- 235000015243 ice cream Nutrition 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 235000011888 snacks Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- 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
-
- 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
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
- B65B61/18—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for making package-opening or unpacking elements
- B65B61/188—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for making package-opening or unpacking elements by applying or incorporating profile-strips, e.g. for reclosable bags
-
- 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
- B65B9/06—Enclosing successive articles, or quantities of material, in a longitudinally-folded web, or in a web folded into a tube about the articles or quantities of material placed upon it
- B65B9/08—Enclosing successive articles, or quantities of material, in a longitudinally-folded web, or in a web folded into a tube about the articles or quantities of material placed upon it in a web folded and sealed transversely to form pockets which are subsequently filled and then closed by sealing
- B65B9/093—Enclosing successive articles, or quantities of material, in a longitudinally-folded web, or in a web folded into a tube about the articles or quantities of material placed upon it in a web folded and sealed transversely to form pockets which are subsequently filled and then closed by sealing the web having intermittent motion
-
- 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
-
- 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
- B65B9/207—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 advancing continuously
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49782—Method of mechanical manufacture of a slide fastener
Definitions
- the present invention generally relates to methods and apparatus for manufacturing reclosable plastic bags and, more particularly, to a method and apparatus for manufacturing reclosable plastic bags using a pre-applied slider-operated fastener.
- form-fill-seal means producing a bag or pouch from a flexible packaging material, inserting a measured amount of product, and closing the bag.
- FFS packaging Two distinct principles are utilized for FFS packaging: horizontal and vertical.
- a flat web of plastic film is shaped around a bag- forming tube. As the shaped web moves down around the forming tube, the opposing edges of the web are overlapped for either a fin or lap seal. At this point, with the web wrapped around the tube, the web moving vertically down along the bag-forming tube will be sealed.
- a vertical seal mechanism forms the fin or lap seal to make the web into a tube
- a cross-seal mechanism forms a cross-seal beneath the bag-forming tube to simultaneously seal the top of a filled bag and the bottom of a succeeding empty bag. After sealing the bottom of the succeeding empty bag, the succeeding empty bag is filled with a product dropped through the bag-forming tube.
- a fastener is typically attached to the inner surface of the web.
- the fastener may be continuous and move in the same direction as the web, or the fastener may be divided into individual bag-width segments applied transverse to the direction of web movement.
- a slider may be slidably mounted thereto. The slider engages the fastener's interlocking profiles while moved in one direction, and disengages the profiles while moved in the opposite direction.
- the present invention provides a method and apparatus for making reclosable plastic bags using a pre-applied slider- operated fastener.
- a fastener is attached to a moving flat web of plastic film, preferably in the direction of web movement and near the center of the web.
- a plurality of sliders are mounted to the fastener either before or after the fastener is attached to the flat web, but prior to conveying the web to a FFS machine.
- the flat web with the slider-operated fastener already attached thereto, is then conveyed to a vertical or horizontal FFS machine where the flat web is formed into bags, and the bags are successively filled and sealed.
- a significant advantage of attaching the slider-operated fastener to the flat web upstream from the FFS machine is that the operations of mounting the sliders to the fastener and attaching the fastener to the flat web can be performed independently from the FFS machine and therefore do not adversely impact the FFS machine's efficiency and performance.
- the performance of the FFS machine can be measured by such parameters as the machine's filling rate, cycle speed, scrap/reclaim generation, etc.
- a broad range of current FFS machines can be easily retrofitted to handle the web with minimal customization.
- FIG. 1 depicts a method of making a slider-operated fastener
- FIG. 2 depicts a method and apparatus for attaching the slider-operated fastener to a flat web of plastic film and then conveying the web to a horizontal FFS machine;
- FIG. 3 depicts a method and apparatus for attaching the slider-operated fastener to a flat web of plastic film and then conveying the web to a vertical FFS machine;
- FIG. 4 is an enlarged isometric view of the vertical FFS machine;
- FIG. 5 is a section taken generally along line 5-5 in FIG. 4;
- FIG. 6 is an isometric view of a partially-opened finished bag produced by the methods and apparatus of FIGS. 2 and 3;
- FIG. 7 depicts a method and apparatus for attaching the slider-operated fastener to a flat web of plastic film and then conveying the web to a horizontal FFS machine in the form of a flow wrapper;
- FIG. 8 is a section taken generally along line 8-8 in FIG. 7;
- FIG. 9 is a section taken generally along line 9-9 in FIG. 7. While the invention is susceptible to various modifications and alternative forms, a specific embodiment thereof has been shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that it is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
- FIG. 1 depicts a method of making a slider-operated fastener for use in reclosable plastic bags, h the method, there is provided a continuous fastener 10 including first and second opposing tracks 12 and 14.
- the tracks 12 and 14 include respective first and second interlocking profiles 16 and 18 and respective first and second fins 20 and 22 extending downward from the respective profiles 16 and 18.
- the profile 16 preferably includes a rib, and the profile 18 preferably includes a groove for receiving the rib. Further details concerning the construction of the profiles 16 and
- the fastener 10 may be unwound from a spool or the like.
- the fastener 10 is conveyed by rollers and the like (not shown) to a preseal station.
- the preseal station includes a pair of reciprocating seal bars 24 and 26. Either both of the seal bars 24 and 26 move back and forth between open and closed positions, or one of the seal bars is stationary while the other seal bar moves back and forth. At least the seal bar 24 is heated. The other bar 26 may be heated as well, or may simply serve as a backing against which the heated seal bar 24 applies pressure when the seal bars 24 and 26 are brought together. The temperature, pressure, and dwell time of the seal bars 24 and 26 are properly adjusted to allow the seal bars 24 and 26 to impart a U- shaped preseal 28. While the fastener 10 is temporarily stopped at the preseal station, the fins 20 and 22 are sealed to each other along the U-shaped preseal 28.
- the preseal 28 is a pair of reciprocating seal bars 24 and 26. Either both of the seal bars 24 and 26 move back and forth between open and closed positions, or one of the seal bars is stationary while the other seal
- the seal bar 24 has a U-shaped projection 30 corresponding to the shape of the preseal 28.
- the preseal 28 is lo illustrated as being generally U-shaped, the area between the sides 28a, 28b of the preseal 28 may be sealed as well so that the preseal 28 appears like a solid rectangle.
- the preseal 28 preferably does not extend into the profiles 16 and 18 due to the technique for installing sliders on the fastener 10 later in the manufacturing process.
- the fastener 10 After forming the preseal 28, the fastener 10 is conveyed to a notching station.
- the notching station includes a pair of reciprocating cutters 32 and 34. Either both of the cutters 32 and 34 move back and forth between open and closed positions, or one of the cutters is stationary while the other cutter moves back and forth.
- the cutter 32 forms a rectangular projection, while the cutter 34 forms a rectangular hole for receiving the projection.
- the fastener 10 is temporarily stopped at the notching station with the
- the preseal 28 generally encompasses the notch 38 and defines a periphery thereof such that the preseal provides a leak-resistant barrier to entry into an interior of the fastener 10 between the fins 20 and 22 via the notch 38.
- the leak-resistant barrier effectively minimizes leaks in the reclosable plastic bags ultimately formed by the manufacturing process.
- the fastener 10 is conveyed to a slider insertion station. While the fastener 10 is temporarily stopped at the slider insertion station, a slider 40 from a source of multiple sliders is positioned within the notch 38. The slider 40 is then threaded onto the fastener 10 in response to relative movement of the slider 40 and the fastener 10.
- the slider 40 may be constructed to allow for various other types of installations.
- the slider may be a multipart plastic slider including a separator finger and two side walls mechanically joined together in place on the fastener.
- This multipart slider is disclosed in U.S. Patent Nos. 5,007,142 and 5,426,830, which are incorporated herein by reference in their entireties.
- the slider may have one or more hinged wings that fold and snap permanently in place to attach it to the fastener.
- This foldable slider is disclosed in U.S. Patent Nos. 5,010,627, 5,063,644, 5,070,583, and 5,448,808, which are incorporated herein by reference in their entireties.
- the slider may have semi-flexible side walls that allow the slider to be pushed downward onto the fastener from above.
- the slider may be flexible and including a post-installation rigidizing structure as disclosed in U.S. Patent No. 5,283,932, which is incorporated herein by reference in its entirety.
- the end stops perform three primary functions: (1) preventing the slider 40 from going past the ends of the fastener, (2) holding the profiles together to resist stresses applied to the profiles during normal use of the plastic bag, and (3) minimizing leakage from inside the plastic bag out through the fastener ends.
- the end stop applicator includes a pair of chilled, reciprocating molds 47 and 49. Either both of the molds 47 and 49 move back and forth between open and closed positions, or one of the molds is stationary while the other mold moves back and forth. While the fastener 10 is temporarily stopped, the molds 47 and 49 close around the fastener ends 46 and 48.
- a predetermined amount of flowable plastic material is then forced around and between the profiles 16 and 18 at the fastener ends 46 and 48 by a conventional back pressure device (not shown) coupled to the supply tube.
- the molds 47 and 49 form channels for receiving the plastic material and guiding it to the fastener ends 46 and 48.
- other types of end stops may be applied to the fastener ends 46 and 48, including those disclosed in U.S. Patent Nos.
- each end stop is in the form of a fairly rigid strap/clip that wraps over the top of the fastener.
- One end of the strap is provided with a rivet-like member that penetrates through the fastener fins and into a cooperating opening at the other end of the strap.
- the various stations simultaneously perform their respective functions on different parts of the continuous fastener 10 spaced approximately at bag- width distances apart. Therefore, as the preseal station forms a new preseal 28, (1) the notching station forms a new notch 38 within a previously formed preseal, (2) the slider insertion station installs a slider 40 via a previously formed notch, and (3) the end stop applicator applies new end stops 42 and 44 proximate a previously installed slider. After each of the stations has completed its respective function on the stopped fastener 10, movement of the fastener 10 is resumed. The fastener 10 is moved for approximately a bag- width distance so that the next station can perform its respective function.
- the preseals 28 are advantageous in that they allow the fastener 10 to be controlled during such downstream operations as notch formation, slider installation, and end stop installation and when the fastener 10 is tensioned by various rollers in the bag making machine.
- the preseals 28 keep the interlocked profiles 16 and 18 together and prevent them from moving longitudinally relative to each other.
- the fastener 10 is preferably applied to a moving flat web of plastic film that is then formed into individual plastic bags.
- the fastener 10 may be conveyed to a storage medium, such as a spool, and placed in an intermediate storage facility, and then applied to the moving web at a later time.
- a storage medium such as a spool
- FIG. 2 depicts a method and apparatus for attaching the slider-operated fastener 10 to a flat web 50 of plastic film and then conveying the web 50 to a horizontal FFS machine.
- the fin 20 of the fastener 10 is "tacked” or lightly sealed to a moving web 50 of plastic film unwound from a film roll 52.
- a pair of reciprocating seal bars 54 and 56 To tack the fastener fin 20 to the moving web 50, there is provided a pair of reciprocating seal bars 54 and 56. Either both of the seal bars 54 and 56 move back and forth between open and closed positions, or one of the seal bars is stationary while the other seal bar moves back and forth. Both the fastener 10 and the web 50 are temporarily stopped while the seal bars are brought together to tack the fastener 10 to the web 50.
- the stoppage of the fastener 10 and web 50 for tacking can be made to coincide with the stoppage of the fastener 10 in FIG. 1 for forming the preseal and notch and installing the slider and end stops.
- the seal bars 54 and 56 are replaced with a continuous heat sealing mechanism such as a static hot air blower that blows hot air onto the moving fastener.
- the tacked fastener 10 is carried with the moving web 50 without shifting relative thereto.
- the fastener-carrying web 50 is conveyed to the horizontal FFS machine.
- the web 50 is folded in half with the fastener 10 inside the web 50 and proximate the fold 51.
- the web 50 is conveyed over a horizontal roller 58, under a triangular folding board 60, and then between a pair of closely spaced vertical rollers 62.
- the folded web 50 includes a pair of overlapping panels 64 and 66 joined along the fold 51.
- the fastener fins 20 and 22 are permanently sealed to the respective web panels 66 and 64 by respective seal bars 68 and 70.
- the seal bars 68 and 70 are sufficiently wide that they generate the fin seals across the entire width of a bag. Either both of the seal bars 68 and 70 move back and forth between open and closed positions, or one of the seal bars is stationary while the other seal bar moves back and forth.
- the fastener-carrying web 50 is temporarily stopped while the seal bars are brought together to seal the fastener 10 to the web 50.
- Both of the seal bars 68 and 70 are preferably heated.
- the temperature, pressure, and dwell time of the seal bars 68 and 70 are properly adjusted to allow the seal bars 68 and 70 to generate the permanent fin seals.
- the seal bars 68 and 70 are replaced with a continuous heat sealing mechanism such as a pair of hot air blowers that blow heated air onto the respective fastener fins.
- the web panels 64 and 66 are sealed to each other along a side seal 72 by a pair of reciprocating seal bars 74 and 76.
- the side seal 72 is transverse to a direction of movement of the folded web 50 and is aligned with a center of the notch 38 (and preseal 28). Also, the side seal 72 extends from the folded bottom 51 to an open top 53 of the folded web 50.
- the folded web 50 is conveyed to a cutter 78 for separating the folded web 50 into individual plastic bags. While the folded web 50 is temporarily stopped, the cutter 78 cuts the folded web 50 along a center of the side seal
- the plastic bag 80 is filled with a product through its open top 53 at a filling station 81. Finally, the open top 53 is sealed by a heat sealing mechanism 84. The end result is a filled and sealed bag 80 ready for shipment to a customer such as a grocery store or convenience store.
- the fastener 10 various stations simultaneously perform their respective functions on different parts of the continuous web 50.
- the fastener fins 20 and 22 of a previously tacked section of the fastener 10 can be permanently sealed to the respective web panels 64 and 66 by respective seal bars 68 and 70, (2) the web panels 64 and 66 carrying previously sealed
- fastener fin sections can be sealed to each other along a side seal 72 by the seal bars 74 and 76, and (3) the folded web 50 can be cut along a previously generated side seal. After each of the stations has completed its respective function on the stopped web 50, movement of the web 50 is resumed.
- each preseal 28 intersects both the adjacent side seal 72 and the fastener profiles 16 and 18, thereby providing a leak- resistant barrier between an interior and an exterior of the bag 80.
- this leak-resistant barrier minimizes food spoilage and leakage of product from inside the bag.
- FIGS. 3-5 depict a method and apparatus for attaching the slider- operated fastener 10 to the flat web 50 of plastic film and then conveying the web 50 to a vertical FFS machine.
- the seal bars 54 and 56 discussed above the fin of the fastener 10 is "tacked" or lightly sealed to the moving web 50 of plastic film unwound from a film roll 52.
- the fastener-carrying web 50 is conveyed to the vertical FFS machine, which forms and fills vertically instead of horizontally.
- the vertical FFS machine produces flexible bags from the flat web 50, which has the slider-operated fastener 10 already attached thereto.
- the web 50 is fed through a series of rollers 90 to a bag-forming collar/tube, where the finished bag 80 is formed.
- the roller arrangement (which may include more than the two illustrated rollers 90) maintains minimum tension and controls the web 50 as it passes through the machine, preventing overfeed and whipping action.
- the bag-forming collar or shoulder 92 receives the web 50 from the rollers and changes the web travel from a flat plane and shapes it around a bag-forming tube 94.
- the opposing vertical edges of the web 50 are overlapped for either a fin or lap seal 96.
- a fin seal 96 which is shown in FIGS. 3-5, can be made of materials with sealing properties on only the inner side of the web, because the heat sealable surface seals to itself.
- a lap seal uses slightly less material, but it requires sealing properties on both sides of the web because the lap is made by sealing the inner ply of one edge to the outer ply of the other edge.
- the overlapped vertical edges moving vertically down along the bag-forming tube 94 are sealed.
- the web 50 advances a predetermined distance that equals the desired bag-width dimension.
- a pair of conventional draw-down drive belts maybe located on opposite sides of the bag-forming tube 94.
- the drive belts are sufficiently close to the tube 94 to both draw the wrapped web 50 downward and pull additional web material through the collar 92.
- the bag width (vertical direction in FIGS. 3 and 4) is the extent of the material hanging down from the bottom of the bag-forming tube 94.
- the bag height (horizontal direction in FIGS.
- a pair of reciprocating vertical (longitudinal) seal bars 100 are mounted adjacent to the face of the bag-forming tube 94 and are positioned to seal the fin (or lap) seal 96 that makes the web 50 into a tube.
- the fin seal 96 forms the bottom of the finished bag 80 in FIG. 6.
- front and rear cross-sealing (horizontal) jaws 102 combine top- and bottom- sealing sections with a bag cutoff device in between.
- the top-sealing portion seals the "bottom” of a succeeding empty bag suspended down from the bag-forming tube 94, and the bottom portion seals the "top” of a filled bag.
- the "bottom” and “top” actually correspond to the sides 72 of the finished bag 80 in FIGS. 6.
- the cutoff device which can be a knife or a hot wire, operates during the jaw closing/sealing operation. This means that when the jaws 102 are open, the filled bag is released from the machine.
- the cross (end) seals are generated in line with the preseals and notches produced by the fastener manufacturing method in FIG. 1.
- a pair of reciprocating vertical (longitudinal) seal bars 104 are mounted adjacent to the face of the bag-forming tube 94 diametrically opposite from the seal bars 100 used to generate the fin seal 96.
- the seal bars 104 are positioned to permanently seal the fastener fins 20 and 22 to opposing sides of a C-fold 112 of the web 50.
- the seal bars 104 are sufficiently long that they generate the seals across the entire width (vertical direction in FIGS. 3 and 4) of a bag produced by the vertical FFS machine.
- the bag-forming collar 92 includes a pair of slots 106 and 108 diametrically opposite to each other when the collar 92 is viewed from above (see FIG. 5).
- the conventional exterior slot 106 intersects the outer periphery of the collar 92 and is used to position the opposing longitudinal edges of the web 50 adjacent to each other in preparation for the fin seal 96.
- the interior U-shaped slot 108 cooperates with a folding plate 110 attached to an outer surface of the bag-forming tube 94 to create the C-fold 112 in the web 50.
- the interior slot 108 opens toward the bag- forming tube 94 and accommodates the folding plate 110. There is a small gap between the collar 92 and the folding plate 110 at the location of the interior slot 108.
- the folding plate 110 starts above the collar 92 and extends vertically downward below the collar 92 to a height just above the seal bars 104.
- the C-fold 112 is diametrically opposite the fin seal 96.
- the fastener 10 is positioned slightly off the centerline between the longitudinal edges of the flat web 50 so that when the fastener 10 is drawn through the interior slot 108 of the collar 92, the fastener 10 is located to one side of the C-fold 112.
- the seal bars 104 permanently seal the fastener fins to the opposing sides of the C-fold 112.
- the folding plate 110 is located entirely above the seal bars 104 so that the folding plate 110 does not interfere with this sealing operation.
- the finished bag 80 produced by the vertical FFS machine is generally depicted in FIG. 6.
- the width and height dimensions of the bag may vary from the illustrated dimensions, depending on whether the bag is produced by the horizontal FFS machine in FIG. 2 or the vertical FFS machine in FIGS. 3-5.
- FIG. 7 depicts a method and apparatus for attaching the slider-operated fastener 10 to the flat web 50 of plastic film and then conveying the web 50 to a horizontal FFS machine in the form of a flow wrapper.
- the flow wrapper forms a bag or pouch by wrapping the web 50 around a product, forming a tube with a fin seal, and sealing the ends.
- the flow wrapper may be used for a variety of products including, for example, snack foods, ice cream bars, bakery items, novelties, medical supplies, hardware, and other small lightweight items.
- the web can be made of polyethylene, polypropylene, treated paper, laminates, and other wrapping materials that may be heat sealed. Materials that do not heat seal naturally may be given heat seal characteristics by treating or laminating them with heat sealing materials.
- the pouches may be made with or without gussets at the ends.
- the fin of the fastener 10 is "tacked” or lightly sealed to a central portion of the moving web 50 of plastic film unwound from a film roll 52.
- the fastener 10 maybe attached near an edge of the moving web 50.
- the fastener-carrying web 50 is conveyed to the flow wrapper.
- the web 50 is fed from the roll 52 into a former 114.
- a smooth uniform flow of the web 50 is provided by the force that is produced by passing the edges of the web through a pair of adjacent fm seal wheels 116.
- the web 50 flows into the former 114 over its plough-shaped wings that shape it into a tube around a product 115 as it is being delivered by a conveyor 118.
- the former 114 includes an upper slot 124 (see FIG. 8) and a loop-forming bar
- the slot 124 extends inwardly from a downstream end of the former 114 and cooperates with the bar 126 to create a C-fold 128 in the web 50.
- the fastener 10 is positioned slightly off the centerline of the web 50 so that when the web 50 is forced through the slot 124 by the bar 126, the fastener 10 is located to one side of the C-fold 128.
- a pair of fastener seal wheels 130 (see FIG. 9) permanently seal the fastener fins to the opposing sides of the C-fold 128. This seal is made as the C-fold 128 and fastener 10 are pulled through the seal wheels 130.
- the two seal wheels 130 have interlocking sets of grooves that make corrugations in the seal as the C-fold 128 and fastener 10 are pulled between the wheels.
- the wheels 130 are heated to bring the web 50 up to the sealing temperature as the corrugation is made. If the web 50 requires a higher sealing temperature, a set of smooth wheels may also be used to preheat the C-fold 128 and fastener 10 before they enter the seal wheels 130.
- the amount of pressure exerted by the seal wheels 130 on the web 50 is important for good sealing. The pressure is regulated by adjusting the clearance between the two wheels.
- the former 114 also shapes the longitudinal edges of the web 50 into two flaps, or fins, which are sealed together downstream from the fastener seal wheels 130.
- the fin seal 120 is generally opposite the C-fold 128 containing the fastener 10 and is made as the fin flaps of the tube are pulled through a pair of fin seal wheels 116.
- the two fin seal wheels 116 have interlocking sets of grooves that make corrugations in the seal as the fins are pulled between the wheels.
- the wheels 116 are heated to bring the web 50 up to the sealing temperature as the corrugation is made. If the web 50 requires a higher sealing temperature, a set of smooth fin wheels may also be used to preheat the fins before they enter the fin seal wheels 116.
- the amount of pressure exerted by the fin seal wheels 116 on the web 50 is important for good sealing. The pressure is regulated by adjusting the clearance between the two wheels.
- the tightness or looseness of the wrap around the product 115 can be adjusted by tilting the fin seal wheels 116. Tilting the fin seal wheels 116 toward the discharge end of the machine will draw more film between the wheels and product a wider fin seal and a tighter wrap. Tilting the fin seal wheels 116 toward the in-feed end will pull less material between the wheels and loosen the wrap.
- the ends of the pouch are sealed by a pair of cross-sealing jaws 122.
- the cross-sealing jaws 122 combine a pair of end-sealing sections with a cutoff device in between.
- One of the end-sealing sections seals the trailing end of one pouch, while the other end-sealing section seals the leading end of a succeeding pouch.
- the cutoff device which can be a knife or a hot wire, operates during the jaw closing/sealing operation. This means that when the jaws are open, the filled pouch can be discharged from the flow wrapper.
- the cross (end) seals are generated in line with the preseals and notches produced by the fastener manufacturing method in FIG. 1.
- the fastener 10 may be attached to the flat web 50 prior to forming the preseal 28 and notch 38, installing the slider 40, and applying the end stops 42 and 44.
- the operations are preferably performed prior to conveying the web 50 to a horizontal or vertical FFS machine.
- the equipment used in the fastener and bag manufacturing processes may be modified so that the processes are entirely continuous with no temporary stoppages in the movement of the fastener or bag making web.
- any and all of the unit operations may be performed (1) during a continuous web motion such as a rotary or continuous draw machine or (2) during the web index of an intermittent motion machine.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Making Paper Articles (AREA)
- Containers And Plastic Fillers For Packaging (AREA)
- Slide Fasteners (AREA)
- Bag Frames (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002385702A CA2385702C (en) | 2000-08-10 | 2001-07-30 | Method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener |
JP2002517376A JP5002789B2 (en) | 2000-08-10 | 2001-07-30 | Method and apparatus for making reclosable plastic bags using pre-mounted slider actuated fasteners |
AU77282/01A AU7728201A (en) | 2000-08-10 | 2001-07-30 | Method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener |
DE60140547T DE60140547D1 (en) | 2000-08-10 | 2001-07-30 | METHOD AND DEVICE FOR PRODUCING RECYCLABLE PLASTIC BAGS WITH PRE-ASSEMBLED ZIPPERS |
EP01955081A EP1309487B1 (en) | 2000-08-10 | 2001-07-30 | Method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener |
AT01955081T ATE449004T1 (en) | 2000-08-10 | 2001-07-30 | METHOD AND DEVICE FOR PRODUCING RESEALABLE PLASTIC BAGS WITH A PRE-APPLIED ZIPPER |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/637,038 US6871473B1 (en) | 2000-08-10 | 2000-08-10 | Method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener |
US09/637,038 | 2000-08-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002012064A1 true WO2002012064A1 (en) | 2002-02-14 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/041463 WO2002012064A1 (en) | 2000-08-10 | 2001-07-30 | Method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener |
Country Status (9)
Country | Link |
---|---|
US (2) | US6871473B1 (en) |
EP (1) | EP1309487B1 (en) |
JP (1) | JP5002789B2 (en) |
AT (1) | ATE449004T1 (en) |
AU (1) | AU7728201A (en) |
CA (1) | CA2385702C (en) |
DE (1) | DE60140547D1 (en) |
ES (1) | ES2335085T3 (en) |
WO (1) | WO2002012064A1 (en) |
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- 2001-07-30 EP EP01955081A patent/EP1309487B1/en not_active Expired - Lifetime
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EP1288132A3 (en) * | 2001-08-31 | 2005-08-03 | Illinois Tool Works Inc. | Tamper-evident easy-open slider package and related methods of manufacture |
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WO2008092692A1 (en) * | 2007-01-31 | 2008-08-07 | Cfs Bakel B.V. | Meat product cooked in a tray |
Also Published As
Publication number | Publication date |
---|---|
AU7728201A (en) | 2002-02-18 |
US7093409B2 (en) | 2006-08-22 |
CA2385702A1 (en) | 2002-02-14 |
EP1309487B1 (en) | 2009-11-18 |
ES2335085T3 (en) | 2010-03-22 |
JP2004505807A (en) | 2004-02-26 |
ATE449004T1 (en) | 2009-12-15 |
US20050086911A1 (en) | 2005-04-28 |
JP5002789B2 (en) | 2012-08-15 |
CA2385702C (en) | 2007-06-05 |
DE60140547D1 (en) | 2009-12-31 |
US6871473B1 (en) | 2005-03-29 |
EP1309487A4 (en) | 2005-01-05 |
EP1309487A1 (en) | 2003-05-14 |
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