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WO1996003272A1 - Procede et appareil de fabrication de sacs en plastique se maintenant debout - Google Patents

Procede et appareil de fabrication de sacs en plastique se maintenant debout Download PDF

Info

Publication number
WO1996003272A1
WO1996003272A1 PCT/US1995/009351 US9509351W WO9603272A1 WO 1996003272 A1 WO1996003272 A1 WO 1996003272A1 US 9509351 W US9509351 W US 9509351W WO 9603272 A1 WO9603272 A1 WO 9603272A1
Authority
WO
WIPO (PCT)
Prior art keywords
bag
along
stand
flap
collapsible
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US1995/009351
Other languages
English (en)
Inventor
Larry W. Crabtree
Jerome J. Kennedy
Kenneth H. Kirby
Ronald L. Ramsay
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lin Pac Inc
Original Assignee
Lin Pac Inc
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 Lin Pac Inc filed Critical Lin Pac Inc
Priority to AU31445/95A priority Critical patent/AU3144595A/en
Publication of WO1996003272A1 publication Critical patent/WO1996003272A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/06—Handles
    • B65D33/12—String handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/005—Bags or like containers made of paper and having structural provision for thickness of contents by folding a single blank to U-shape to form the base of the bag and opposite sides of the body-portion, the remaining sides being formed by extensions of one or more of these opposite sides
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2170/00—Construction of flexible containers
    • 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
    • B31B70/02—Feeding or positioning sheets, blanks or webs
    • B31B70/022—Holders for feeding or positioning sheets or webs
    • B31B70/024—Rotating holders, e.g. star wheels, drums

Definitions

  • the present invention relates to a stand-up plastic bag. More particularly, the present invention pertains to a method and apparatus for making a plastic bag that is capable of standing up by itself, when the bag is opened, and also capable of fully exposing the front or back display surfaces of the bag, when the bag is folded.
  • the present invention is directed to the method and apparatus for manufacturing a stand-up plastic bag that substantially obviates one or more of the limitations of the related art.
  • the apparatus of the present invention comprises supply means for providing a continuous length of heat sealable material, and bag assembly means connected to the supply means for producing a bag from the heat sealable material having closed sides, a closed bottom, and an open mouth.
  • the apparatus also includes means for receiving the bag from the bag assembly means and shaping the bag into a stand-up plastic bag.
  • the bag shaping means includes a series of stations including: a first station for forming opposed faces, opposed sides, and a substantially flat bottom; a second station for creasing at least the bottom of the bag, so that the bottom folds inwardly and does not obstruct the front and back display surfaces of the bag; and a third station for unloading the bag.
  • the bag shaping means includes at least one rotatable turret assembly for positioning the bag at each of the stations.
  • the turret assembly includes means for holding the bag as the turret assembly is rotated.
  • the holding means includes a collapsible frame that is positioned within the bag when the frame is at least partially collapsed. The frame is expanded and collapsed during processing at the various stations before the bag is unloaded for collection and stacking.
  • the present invention comprises a method of manufacturing a stand-up plastic bag.
  • the method includes unwinding a roll of heat sealable material and conveying the material through an arrangement of rollers.
  • the material is folded to form top and bottom sheets, which are intermittently sealed along a seal line extending transverse to the direction of travel of the material when it is sealed.
  • the method also includes cutting the material along the seal line to form individual bags having a closed bottom and an open mouth.
  • the bags are then loaded onto a frame for shaping the bags interiorly to correspond essentially to the frame, so that when the bag is opened the bag has a substantially planar bottom surface and support columns, such as vertical folds, extending from the bottom surface.
  • the method also includes creasing a fold line along at least the bottom surface of the bag for folding each of the bags inwardly along the fold line so that neither the front nor back display surfaces is obstructed by the bottom surface when the bag is folded.
  • the method includes the step of providing lateral support to prevent the bag from collapsing inwardly when the bag is opened.
  • the lateral support includes cuffing a top portion of the bag.
  • the method also may include applying tape along a top portion of the bag, for example, along the cuff.
  • FIG. 1 is a schematic diagram of the layout of the apparatus for making a stand-up plastic bag in accordance with the present invention.
  • FIG. 2a is a side elevation view of an unwind section of the present invention.
  • FIG. 2b is a perspective view of the details of the unwind section of the present invention.
  • FIG. 3a is a side elevation view of a cuffer section of the present invention.
  • FIG. 3b is a perspective view of the details of the cuffer section of the present invention.
  • FIG. 3c is a perspective view of a scoring assembly in the cuffer section of the present invention.
  • FIG. 3d is a perspective view of a lower roll bar in the cuffer section of the present invention.
  • FIG. 3e is a perspective view of an upper roll bar in the cuffer section of the present invention.
  • FIG. 3f is a side elevation view of a tie bar mechanism in the cuffer section of the present invention.
  • FIG. 3g is a rear perspective view of the tie bar mechanism shown in FIG. 3f.
  • FIG. 4a is a rear elevation view of a bag folding section of the present invention featuring an alternative arrangement of scoring assemblies.
  • FIG. 4b is a side elevation view of the bag folding section shown in FIG. 4a except the alternative embodiment is not shown.
  • FIG. 4c is a perspective view of the bag folding section shown in FIGS. 4a and 4b except the alternative embodiment is not shown.
  • FIG. 5 is a side elevation view of the bag seal and cut section of the present invention.
  • FIG. 6a is a schematic diagram of stations in a turret assembly of the present invention.
  • FIG. 6b is a top view of the turret assembly of the present invention.
  • FIG. 6c is a side view of a fully opened, collapsible frame in the turret assembly of the present invention.
  • FIG. 6d is a side view of a partially collapsed frame in the turret assembly of the present invention.
  • FIG. 6e is a side view of a fully collapsed frame in the turret assembly of the present invention.
  • FIG. 6f is a top view of a flap sealing station in the turret assembly of the present invention.
  • FIG. 6g is a front elevation view of a bag mounted on the fully opened, collapsible frame in the turret assembly of the present invention, and showing a flap of additional material adjacent the bottom surface of the bag.
  • FIG. 6h is a top view of a gusset-forming station in the turret assembly of the present invention.
  • FIG. 6i is a side, sectional view of a creaser bar of the present invention taken along lines "6i-6i" in FIG. 6h.
  • FIG. 6j is a front elevation view showing side, gusset-forming creaser bars of the present invention disposed beneath the collapsible frame.
  • FIG. 6k is a front elevation of the embodiment in FIG. 6h, except a gusset-forming creaser bar disposed along the bottom of the bag is not shown.
  • FIG. 61 is a front elevation view of a bag mounted on a partially collapsed, collapsible frame with side, gusset-forming creaser bars engaging the sides of the bag, in accordance with the present invention.
  • FIG. 7a is a perspective view of a fully opened, stand-up plastic bag of the present invention.
  • FIG. 7b is a perspective view of a partially opened, stand-up plastic bag of the present invention.
  • FIG. 7c is a perspective view of a fully opened, stand-up plastic bag of the present invention with the flap secured to the side of the bag.
  • FIG. 7d is a perspective view of a substantially closed, stand-up plastic bag of the present invention.
  • FIG. 7e is a perspective view illustrating details of a top portion of the stand-up plastic bag of the present invention.
  • FIG. 7f is a cross-section of the bag taken along lines "7f-7f" in FIG. 7e.
  • FIG. 7g is a perspective view of a fully opened, stand-up plastic bag of the present invention with the flap secured in an inner pocket formed between the sides and bottom of the bag.
  • the present invention relates to a method and apparatus for manufacturing a collapsible, stand-up plastic bag comprising a substantially planar bottom surface when the bag is opened, and support columns extending upward from the bottom surface for holding the bag upright.
  • the support columns define front, back, and side surfaces of the bag.
  • the bag also includes a substantially continuous seam along the bottom and side surfaces for folding the bottom and side surfaces inward when collapsing the bag, so that the front and back surfaces of the bag are substantially, fully exposed when the bag is folded.
  • FIG. 1 An exemplary schematic diagram of the method and apparatus for manufacturing stand-up plastic bags in accordance with the present invention is shown in FIG. 1.
  • the apparatus of the present invention includes an unwind section, which is identified in FIG. 1 by reference character A.
  • the apparatus also includes a cuffer section B, a handle forming section C, a bag folding section D, and a bag seal and cut section E, where individual bags are assembled.
  • the individual bags are then conveyed to one or more turrets, which are generally designated by reference character F.
  • the turrets include stations for shaping and gusseting the bags, which are then off-loaded, collected, and stacked.
  • the apparatus for manufacturing a stand-up plastic bag includes an unwind section for supplying a continuous length of heat sealable material.
  • the unwind section A includes a feed roll 10 having a continuous web of plastic sheet material 12 and an arrangement of rollers, generally referred to as an accumulator or dancer assembly 14.
  • the sheet material 12 is drawn from the feed roll 10 and fed through the dancer assembly 14, which enables uniform tension to be maintained on the sheet material 12 as it is fed to the cuffer section B of the apparatus.
  • the cuffer section includes a scoring assembly spaced from an edge of the length of heat sealable material for scoring the material along a score line a predetermined distance from the edge to form a cuff .
  • the cuffer section B preferably includes a pair of scoring assemblies 16, 16' that are adjustably positioned along a crossbar 20 extending parallel to a scoring roller 22. The sheet material 12 is fed over the scoring roller 22, and the scoring assemblies 16, 16' are aligned along opposite sides 24, 24' of the sheet material 12 (see FIG. 4c) for scoring the sides 24, 24' to form cuffs.
  • scoring assemblies 16, 16' are essentially identical. Therefore, reference will be made to only one of the scoring units 16, though it will be appreciated that both units 16, 16' function similarly and contain similar elements that form cuffs along opposite sides 24, 24' of the same sheet material 12.
  • the scoring assembly 16 comprises outer and inner scorers 26a, 26b.
  • the scorers 26a, 26b have individual scoring discs 28a, 28b mounted on a bracket 30 depending from a housing 32 mounted on the crossbar 20.
  • the housing 32 contains a spring assembly (not shown) for applying tension to each scoring disc 28a, 28b.
  • Each spring or arrangement of springs is operated by a control knob 36 for adjustably controlling the tension applied to the scoring disc 28a, 28b.
  • the scoring discs 28a, 28b have knife-like edges 38 for scoring a pair of parallel creases on the side 24 of the sheet material 12.
  • the outer scoring disc 28a applies a first crease 40 that forms a first cuff 42.
  • the inner scoring disc 28b breaks the memory of the sheet material 12, thereby applying a second crease 44 to form a second or double cuff 46.
  • the scorers 28a, 28b form first and second creases 40, 44 by applying either continuous or intermittent force to the sheet material 12 as the sheet material 12 is conveyed over scoring roller 22.
  • means are provided for folding the material along the creases .
  • the cuffer section preferably includes one or more rollers, such as lower rollers 48a, b and c and upper rollers 50a, b, for folding the side 24 along the creases 40, 44 to form cuffs 42, 46, as the sheet is drawn through the rollers.
  • the side 24 of the sheet material 12 is folded along the first crease 40, thereby forming first cuff 42 as the sheet material passes over the first lower roller 48a and the first upper roller 50a.
  • the second upper roller 50b may be sized to be narrower than the sheet material 12 and slightly narrower than the distance between the second creases 44 on opposite sides 24, 24' of the sheet material 12.
  • an end 52 of the second upper roller 50b preferably is aligned a slight distance inside of the second crease 4 . This alignment enables the unsupported side 24 of the sheet material 12 to begin to fold along the second crease 44, as the sheet material is drawn over the second upper roller 50b.
  • the formation of the second cuff 46 commences as the sheet material is passed over the second upper roller 50b.
  • the sheet material 12 passes from upper rollers 50a, 50b to lower rollers 48b, 48c before exiting the cuffer section B.
  • Substantially adjacent the lower roller 48b is an arrangement of fixed bars, referred to as a tie bar mechanism 53.
  • the side 24 of the sheet material 12 passes through the tie bar mechanism 53, which preferably comprises three fixed bars 53a-c.
  • the tie bar mechanism 53 forces the first and second cuffs 42, 46 together and reinforces the fold along first and second crease lines 40, 44.
  • the sheet material 12 passes around lower rollers 48b, 48c, and exits the cuffer section B.
  • scoring assembly 16' and corresponding rollers and tie bar mechanisms are used to form cuffs on both sides 24, 24' of the sheet material 12 passing through the cuffer section B.
  • the scoring assemblies and corresponding rollers and tie bar mechanisms can be adjusted to accommodate sheet material of varying widths and thicknesses.
  • the sheet material 12 is conveyed to a handle forming section C, where handles 54 are attached to the opposite edges 24 of the sheet material 12.
  • handles may be stamped or punched into the sheet material 12 to provide a means for grasping the bag when formed.
  • the folding section D includes a pair of friction rollers 56a, 56b for drawing sheet material 12 into the folding section D, and a tension bar 58 for applying tension to the sheet material 12.
  • the folding section D also includes a spring-operated scoring assembly 60 similar to the scoring assembly 16, 16' described with respect to the cuffer section B, except the scoring assembly 60 comprises a single scoring disc 62.
  • the scoring assembly 60 is adjustably mounted above a scoring bar 64 over which the sheet material 12 passes. The scoring assembly 60 is aligned so that the scoring bar 64 applies a bottom crease 66 along a midpoint between opposite edges 24 of the sheet material 12.
  • the bottom crease 66 allows the bag 84 to keep the top of the bag in line from front to back. Due to buildup of gauge created by the cuffs, the material is much tighter and will prevent one cuff from running over the other. As such, the center bottom crease 66 locks the sheet material 12 in position, so that the top and bottom surfaces of the sheet material do not slide relative to each other.
  • the scoring assembly 60 may include additional scoring assemblies 61, 61' that provide side creases 67, 67' along either side of the bottom crease 66.
  • the side creases 67, 67' correspond to the side edges for the bottom of the bag when it is eventually formed in the bag shaping assembly F.
  • the side creases 67, 67' provide reinforcement and stability for the bag when it is used.
  • the sheet material 12 is drawn over an upside down A-frame 68 positioned above a nip roll 70 formed by a pair of opposing rollers 72a, 72b.
  • the A-frame 68 is angled downwardly and has steeply angled sides 68a, 68b that lead to a common end point 68c aligned with the bottom crease 66 of the sheet material 12.
  • the sheet material folds along the bottom crease 66, and the top and bottom surfaces of the sheet material are drawn through the nip roll 70 beneath the A-frame 68.
  • the folded sheet material 12 is then lead from the bag folding section D through one or more rollers (not shown) .
  • the folded sheet material is passed to a section of the apparatus for sealing and cutting the folded sheet material to form individual bags.
  • the bag seal and cut section E includes a feed roll 74 for drawing the folded sheet material 12 from the bag folding section D.
  • This section also includes an arrangement of rollers 76 that act as an accumulator for taking up slack in the folded sheet material before it is cut into individual bags.
  • a registration device 78 assesses whether the sheet material 12 is in registration, i.e., in alignment.
  • the registration device is particularly important when the sheet material features a design.
  • the seal and cut section E also may include a preheater 80 for warming the edges 24 of the sheet material where cuffs have been formed so that the edges 24 are easier to seal and cut.
  • the apparatus includes a conventional seal and cut unit 82 for sealing and cutting the sheet material at spaced intervals to form individual bags.
  • the seal and cut unit 82 may seal and cut adjoining bags simultaneously or in sequence (i.e., first seal, then cut), as long as individual, flattened bags 84 are formed having closed sides and an open mouth.
  • the individual bags 84 are pulled from seal and cut unit 82 by a conventional rope conveyor 85 for transfer to the bag shaping section F.
  • the apparatus includes a bag shaping section comprising a conveyor for transferring individual bags from the bag seal and cut section to one or more turrets having stations for shaping and creasing each of the bags.
  • the bag shaping section F includes a conveyor 86 for receiving bag 84 formed by the bag seal and cut section E.
  • the bags 84 are deposited on the conveyor 86 one at a time so that the mouth 88 of each bag 84 faces the side of the conveyor 86 passing closest to the turrets 90. Once the bag 84 reaches the designated turret 90, the bag 84 is loaded on the turret 90 for processing.
  • Each of the turrets 90 include the same processing stations.
  • a turret 90 includes a bag loading station I, a flap sealing station II, a gusset forming station III, a bag unloading station IV, and a vacant station V that has no designated processing function.
  • the turrets 90 comprise a turntable or turnstile 92 supporting five collapsible frames 94 that are indexed from one station to the next.
  • the bag loading station I one of the collapsible frames 94 will receive a bag 84 when the frame 94 is partially or fully collapsed.
  • the turret 90 will rotate to the flap sealing station II and the frame 94 expands within the bag 84 to form side walls 96, a bottom surface 98, and a flap 100 of additional material adjacent to the bottom surface 98. See FIGS. 6b and 7a.
  • a sealing assembly 102 secures the flap 100 to the bag 84.
  • the turnstile 92 rotates and the frame 94 at flap sealing station II will go to gusset forming station III.
  • the other frames 94 will be rotated to the next succeeding station, i.e., I to II, III to IV, IV to V, and then V goes back to I.
  • the side walls 96 and the bottom surface 98 of the bag 84 are creased forming a gusset enabling the bag to fold inwardly along the crease.
  • the bag is delivered to an unload station IV, where the bags are collected and eventually stacked.
  • the vacant station V has no designated function. However, it may be used to load bags manually.
  • the bags 84 formed in the bag seal and cut section E are transferred to the turrets 90 for processing.
  • the bags 84 are conveyed to a gate 104 adjacent a designated turret 90 with the mouth 88 of the bag facing the turret for loading the bags on a collapsible frame 94.
  • suction cups grip the top and bottom of the bag 84, as the gate 104 urges the open bag 84 over the collapsed or partially collapsed frame 94, as shown in FIGS. 6d and 6e.
  • the frame 94 acts as a self-centering mechanism, when expanded, enabling the sides and bottom of the bag to be shaped properly, even if the bag is loaded onto the frame 94 so that one of the side seams of the bag is higher than the other, for example.
  • the collapsible frame 94 includes upper and lower rectangular plates 106, 108 that are interconnected by a hinge mechanism 110.
  • the upper and lower plates 106, 108 are opened (FIG. 6c) and closed (FIG. 6d and 6e) by the hinge mechanism 110, in response to oscillating movement of a drive shaft 112 which is pivotally connected to the hinge mechanism 110.
  • the drive shaft 112 is actuated by an hydraulic system or other conventional means mounted on the turntable 92 and generally designated by reference numeral 114.
  • the turret assembly rotates the bag from the loading station I to the flap sealing station II, as shown in FIG. 6f, and the frame 94 is expanded to a fully open state.
  • the frame 94 is expanded rapidly forming a bag 84 having side walls 96, a bottom surface 98, and a flap 100 of additional material adjacent to the bottom surface 98, as shown in FIG. 6g.
  • the force in which the frame 94 is expanded is sufficient to crease the bag along side and bottom edges 116, 116a of the frame 94 shown in FIG. 6f.
  • the frame 94 provides the square bottom configuration, and the creasing defines vertical and horizontal support columns that enable the bag to stand upright once formed.
  • the flap sealing station II also may include a creasing pads 117 mounted on fixed or movable side frames 117a.
  • the creasing pads 117 engage the bag 84 along the side edges of upper and lower plates 106, 108, thereby reinforcing the creases formed along the sides of the bag when the frame 94 is expanded.
  • the creasing pads 117 which preferably are formed of silicone rubber, may have a planar configuration, or may be a wedge or a disc.
  • the creasing pads 117 also may be heated.
  • a sealing assembly is provided for securing to the bag the flap of additional material, which ordinarily forms adjacent the bottom surface, as shown in FIG.
  • the flap sealing station II includes an exterior flap sealing unit 118 and an interior flap sealing unit 120, which are mounted on a support structure (not shown) that does not obstruct rotation of the turnstile 92 and its associated equipment, particularly the collapsible frame 94.
  • the exterior flap sealing unit II comprises an exterior sealing pad 122 located adjacent to the periphery of the bag when the collapsible frame 94 is rotated to the flap sealing station II.
  • the sealing pad 122 is pivotally mounted on a housing 124 that contains a heating element 126.
  • a similar exterior flap sealing unit is located adjacent the other flap 100 along the bottom of the bag 84.
  • the housing 124 pivots so that the sealing pad 122 engages the flap 100, which is created when the frame is expanded within the tubular material.
  • the flap 100 which typically takes on a triangular configuration, is urged by the sealing pad 122 into contact with the bottom 98 of the bag.
  • the interior sealing unit 120 comprises a sealing pad 128 mounted on a retractable arm 130 that is removably inserted through the mouth 88 of the bag 84 and between upper and lower plates 106, 108.
  • the sealing pad 128 is positioned so that it contacts the bottom interior portion 131 of the bag 84, thereby clamping the bottom of the bag 84 and the flap 100 between the interior seal pad 128 and exterior seal pad 122.
  • the interior seal pad 128 may include a heating element for heat sealing the 100 to the bag 84 along the bottom interior portion 131.
  • exterior and interior seal units 118, 120 are shown to heat seal the flap to the bottom surface 98 of the bag, other conventional seals may be provided.
  • an adhesive (not shown) may be applied to the flap 100 by a separate mechanism before the flap 100 is secured to the bag 84 by the exterior and/or interior sealing units 118, 120.
  • the seal units 118, 120 may be adapted to sew the flap to the bag.
  • the exterior flap sealing unit 118 may be aligned to secure the flap 100 along the side 96 of the bag 84, as shown in FIG. 7c, or the top portion of the bottom of the bag, as shown in Figure 7g.
  • the turret assembly rotates the bag 84 from the flap seal station II to the gusset forming station III.
  • the collapsible frame 94 is in the expanded position, as shown in FIG. 6g.
  • the gusset forming station includes a creaser assembly for forming fold lines along the side walls and the bottom surface of the bag enabling the bag to flatten along the fold lines.
  • the creaser assembly which is generally designated by reference numeral 132, preferably includes an arrangement of creaser bars 134, 136, and 138, as shown in FIG. 6h that are adapted to be disposed around the periphery of the expanded bag.
  • the creaser assembly 132 is mounted on a support structure (not shown) that does not obstruct rotation of the turnstile 92 or its associated equipment.
  • the creaser assembly 132 may be positioned lower than the lower plate 108 of the frame 94, when it is fully expanded, as shown in FIG. 6j .
  • the creaser assembly 132 may be raised and positioned so that the creaser bars 134, 136, and 138 are disposed around the periphery of the bag.
  • the creaser bars 134, 136 and 138 are raised to a height corresponding to a midpoint 140 between upper and lower plates 106, 108, as shown in FIG. 6k.
  • the creaser bars 134, 136 and 138 are mounted on retractable support arms 142 that enable the creaser bars 134, 136, and 138 to be inserted between the upper and lower plates 106, 108.
  • the creaser bars 134, 136, and 138 are inserted simultaneously or at different times, as desired.
  • the creaser bars 134, 136, and 138 form a seam along the sides and bottom of the bag, while the frame 94 collapses to a partially closed position about the inserted creaser bars 134, 136, and 138.
  • the creaser bars 134 which may be heated, form a substantially continuous fold line 144 along the side and bottom surfaces 96, 98 of the bag 84. See FIG. 7a.
  • the gusset forming station III also includes holding means for preventing the bag from shifting when the frame 94 is collapsed.
  • the holding means may include upper and lower holding bars 146, 148, as shown in FIGS. 6b and 6i.
  • the present invention also may include a creasing mechanism for further creasing the bag along the periphery 116 of the frame 94.
  • the gusset forming operation is completed.
  • the collapsible frame 94 is rotated to the unloading station and the bag is taken off the collapsed frame 94 by a suction mechanism (not shown) and an engagement mechanism (not shown), which engage a top portion of the bag 84, and open and slide the gusseted bag 84 off the frame 94.
  • the bag 84 is deposited in a bin (not shown) for stacking.
  • the collapsible frame 94 is then rotated to a fifth station, that is vacant, before returning to the loading station for receiving a new bag.
  • a substantially flat bag 84 (with or without a handle) having close bottom and open mouth (with or without a handle) is produced by the bag seal and cut section E.
  • the bag 84 is deposited on a conveyor 86 for transfer to a turret 90.
  • one or more turrets 90 are aligned along the conveyor, whereby the bag is presented to each turret 90 with the open mouth 88 facing the turret 90.
  • the first bag is stopped by a gate 104 adjacent to the first turret 90 and the first bag is loaded under the first turret 90. Meanwhile, the second and third bags are sent to the second and third turrets 90, respectfully.
  • the fourth bag is sent to the first turret, and the fifth and sixth bags are sent to the second and third turrets, and so forth.
  • the fourth bag is loaded on to the first turret assembly, the first bag is at the flap seal station.
  • every collapsible frame assembly will be indexed so that it is capable of accommodating a bag.
  • the turret assembly is designed to rotate so that each turret generates approximately 20 bags per minutes. If there is a malfunction or a gate fails to engage and load a bag on the turret assembly, the missed bag would be deposited in a holding area at the end of the conveyor 86, as shown in FIG. 1. The bags can then be loaded on the collapsible frame 94 at the auxiliary or vacant station to avoid any waste.
  • the network of components of the present invention perform a number of different functions that are integrally connected and synchronized by software that controls the timing of all the different processing functions. For example, the operation of the gates 104 is controlled so that the gates 104 corresponding to each respective turret 90 load the correct bag in sequence.
  • the bag includes a substantially planar bottom surface 98 when the bag is open.
  • the bag also includes longitudinal support columns or folds 150 and lateral support columns 151 formed by the expanded frame 94.
  • the longitudinal or vertical support columns 150 extend upward from the bottom surface 98 and hold the bag upright when the bag is opened, as shown in FIGS. 7a-7c.
  • the vertical support columns 150 define and side walls 96 that include front and back surfaces 152, 154 of the bag 84.
  • the gusset forming station III forms a substantially continuous seam 144 along the bottom and side surfaces 98, 96, of the bag.
  • the substantially continuous seam 144 enables the bag to fold inwardly along the bottom and side surfaces 98, 96, so that the front and back surfaces 152, 154 are substantially fully exposed when the bag is folded.
  • the seam 144 bisects the bottom and side surfaces 98, 96, enabling the bottom and side surfaces 98, 96 to be substantially concealed when the bag is folded, as shown in FIG. 7d.
  • the flap 100 is secured to the bottom surface 98 of the bag 84 and provides reinforcement for the bottom surface when the bag is opened.
  • the stand-up plastic also includes lateral beam support along an upper portion of the bag for preventing it from collapsing inwardly when the bag is opened.
  • the lateral beam support includes cuffs 42, 44, formed along the top portion of the bag.
  • the lateral beam support may also include tape 156 securing the cuffs 42, 46 to the interior 158 of the bag.
  • the cuffs 42, 44 may include apertures 160 enabling the tape to be secured through the apertures along the interior wall 158 of bag.
  • the bags are designed to fold inwardly along seam 144, thereby allowing the sides and bottom 96, 98 to be substantially concealed, whereas the front and back surfaces 152, 154 are fully visible when folded. As such, any displays or designs on the front or back surfaces 152, 154 are not obstructed by the folding arrangement of the bag.

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

Abstract

Procédé et appareil (F) de fabrication de sacs en plastique se maintenant debout. L'appareil comporte une section fournissant une longueur continue d'un matériau thermoscellable (A) et une section d'assemblage des sacs (B, C, D, E) reliée à la précédente et concourant à la fabrication de sacs présentant un fond et des cotés fermés et un orifice d'accès ouvert. L'appareil comporte également une section de réception (F) des sacs assemblés, qui les transforme en sacs en plastique se maintenant debout et qui comporte elle-même plusieurs postes, dont un premier poste de mise en forme des faces opposées, des côtés opposés et du fond sensiblement plat, un second poste de pliage, du fond au moins, de manière à ce que ce dernier se replie vers l'intérieur sans dissimuler les surface frontale et dorsale d'affichage du sac, et un troisième poste de décharge des sacs.
PCT/US1995/009351 1994-07-25 1995-07-25 Procede et appareil de fabrication de sacs en plastique se maintenant debout Ceased WO1996003272A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU31445/95A AU3144595A (en) 1994-07-25 1995-07-25 Method and apparatus for manufacturing stand-up plastic bags

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US28017694A 1994-07-25 1994-07-25
US28019794A 1994-07-25 1994-07-25
US28019694A 1994-07-25 1994-07-25
US28017894A 1994-07-25 1994-07-25
US08/280,176 1994-07-25
US08/280,197 1994-07-25
US08/280,178 1994-07-25
US08/280,196 1994-07-25

Publications (1)

Publication Number Publication Date
WO1996003272A1 true WO1996003272A1 (fr) 1996-02-08

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ID=27501269

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/009351 Ceased WO1996003272A1 (fr) 1994-07-25 1995-07-25 Procede et appareil de fabrication de sacs en plastique se maintenant debout

Country Status (2)

Country Link
AU (1) AU3144595A (fr)
WO (1) WO1996003272A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001025000A1 (fr) * 1999-10-04 2001-04-12 Alberto Asensio Pastor Systeme de fabrication et de montage d'anses pour sacs papier
EP1287759A3 (fr) * 2001-08-31 2003-10-08 SQUARE BOTTOM, Inc. Sac avec poignée en plastique soudée et procédé de fabrication
US20190315523A1 (en) * 2016-12-14 2019-10-17 Ah Moi TAN Self-supporting plastic bag and method for manufacturing same
CN114193833A (zh) * 2022-01-18 2022-03-18 温州市康发机械有限公司 一种穿绳机的送料机构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313216A (en) * 1962-01-11 1967-04-11 Continental Can Co Bag making apparatus
US3942416A (en) * 1974-03-08 1976-03-09 Mobil Oil Corporation Square bottomed bag folding apparatus
US4362526A (en) * 1980-08-29 1982-12-07 Equitable Bag Co., Inc. Method of making plastic handle bags from continuous web
US4804356A (en) * 1987-03-20 1989-02-14 Shikoku Kakoki Co., Ltd. Apparatus for processing baglike container blanks

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313216A (en) * 1962-01-11 1967-04-11 Continental Can Co Bag making apparatus
US3942416A (en) * 1974-03-08 1976-03-09 Mobil Oil Corporation Square bottomed bag folding apparatus
US4362526A (en) * 1980-08-29 1982-12-07 Equitable Bag Co., Inc. Method of making plastic handle bags from continuous web
US4804356A (en) * 1987-03-20 1989-02-14 Shikoku Kakoki Co., Ltd. Apparatus for processing baglike container blanks

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001025000A1 (fr) * 1999-10-04 2001-04-12 Alberto Asensio Pastor Systeme de fabrication et de montage d'anses pour sacs papier
EP1287759A3 (fr) * 2001-08-31 2003-10-08 SQUARE BOTTOM, Inc. Sac avec poignée en plastique soudée et procédé de fabrication
US20190315523A1 (en) * 2016-12-14 2019-10-17 Ah Moi TAN Self-supporting plastic bag and method for manufacturing same
CN114193833A (zh) * 2022-01-18 2022-03-18 温州市康发机械有限公司 一种穿绳机的送料机构

Also Published As

Publication number Publication date
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