EP0267706A1 - Sacs en liasse et procédé de fabrication - Google Patents

Sacs en liasse et procédé de fabrication Download PDF

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Publication number
EP0267706A1
EP0267706A1 EP87309344A EP87309344A EP0267706A1 EP 0267706 A1 EP0267706 A1 EP 0267706A1 EP 87309344 A EP87309344 A EP 87309344A EP 87309344 A EP87309344 A EP 87309344A EP 0267706 A1 EP0267706 A1 EP 0267706A1
Authority
EP
European Patent Office
Prior art keywords
bag
bags
hand hole
bundle
wall
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.)
Withdrawn
Application number
EP87309344A
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German (de)
English (en)
Inventor
William F. Brown
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0267706A1 publication Critical patent/EP0267706A1/fr
Withdrawn legal-status Critical Current

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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
    • B65D33/001—Blocks, stacks or like assemblies of bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/003—Flexible containers made from webs starting from tubular webs
    • 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
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • 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
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • 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
    • B31B70/74—Auxiliary operations
    • B31B70/86—Forming integral handles or mounting separate handles
    • B31B70/874—Forming integral handles or mounting separate handles involving punching or cutting
    • 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
    • B31B70/74—Auxiliary operations
    • B31B70/92—Delivering
    • B31B70/98—Delivering in stacks or bundles
    • B31B70/988—Assembling or block-forming of bags; Loading bags on a mandrel

Definitions

  • This invention relates to bags, and to a method of and an apparatus for, manufacture of such bags. More particularly, this invention relates to bundles of plastic bags, to the method of manufacture of such bundles and to an apparatus for manufacturing such bundles.
  • Individual, flattened bags were generally piled, one atop another, up to a finite pile height.
  • As a check-out person grasped an uppermost bag from such a pile it was often difficult (for such a person) quickly to engage in a bag-loading procedure which included removing the uppermost bag from the pile, locating the uppermost bag opening, opening the bag and positioning the bag for receipt of goods.
  • Such a bagging procedure thus was often inefficient, time consuming and expensive for the merchandiser.
  • such bags had generally been made of paper.
  • Packaging goods in plastic bags is now quickly becoming the preferred method of packaging merchandise.
  • a plastic handled bag has generally been encountered by the public at a variety of check out counters.
  • many of such plastic bags are generally known to be difficult quickly to open and load with goods. It is currently thought, for example, that charge builds up on the sidewalls of many plastic bags, such charge buildup causing the bag sidewalls to adhere together.
  • a more specific object is to provide a bundle of such bags, such a bag bundle including a plurality of such bags uniformly disposed and fastened together at one end thereof.
  • a further object is to provide such a bundle having an uppermost or closest bag wherein a mouth or opening of such a bag is readily graspable for opening such bag.
  • Yet another object is to provide such a bundle wherein any individual bag (but preferably the uppermost or closest bag) is readily removable, as by a flip of the wrist, from the remainder of bags in the bundle.
  • a related object is to provide a method for the manufacture of such a bag and bag bundle.
  • Another related object is to provide an apparatus for the manufacture of such a bag and bag bundle.
  • the bundle comprises a plurality of plastic bags.
  • Each such bag includes a first sidewall, a second sidewall integral with the first sidewall at lateral end portions thereof, a closed bottom, an opening in distal relation to the bottom and a tab.
  • a longitudinal end portion of the first and second sidewalls defines the opening.
  • the tab is integral with at least one of the first and second sidewall end portions adjacent the opening. The tab, moreover, is readily separable from such sidewall end portion because of the presence of a plurality of perforations formed in such sidewall end portion adjacent the opening.
  • Only one of the first and second sidewalls includes a hand hole formed through such sidewall proximate to the tab.
  • the bags are affixed together at their tabs in a stacked, folded manner, all such bag hand holes being uniformly disposed.
  • the affixed tabs preferably include at least one support hole therethrough for securing the bag bundl e to a support.
  • a first embodiment of the bag bundle 10 (Fig. 1) comprises a plurality of (preferably from about 50 to about 100) joined, collapsed bags 12.
  • the bags 12 are made of plastic and preferably have relatively thin walls.
  • Each such bag 12 includes a first or forward sidewall 14 and a second or rearward sidewall 16 integral with the first sidewall 14 at lateral end portions thereof (Figs. 2-4).
  • Each such bag 12 further includes a bottom 18 forme d by joining together the lower longitudinal end portions of the forward and rearward sidewalls 14, 16 along a transverse line 19 (Fig. 3).
  • Each such bag 12 yet further includes a mouth or opening 20 in distal relation to the bottom 18 (Figs. 2,3).
  • Each such bag 12 additionally includes a tab 24 (Fig. 1).
  • the tab 24 is integral with first and second sidewall upper longitudinal end portions adjacent the opening 20 (Fig. 2).
  • Such sidewall upper longitudinal end portion is separable from its tab 24 because each such bag 12 further includes a linear perforated boundary or margin 26 (Fig. 1) for separating the bag 12 from the tab 24.
  • the sidewalls 14, 16 preferably include longitudinally-disposed inwardly-folded (or gusseted) integral side panels 22 (Fig. 4) at lateral end portions thereof.
  • Only one (preferably the forward sidewall 14) of the sidewalls 14, 16 includes a hand hole 28 (Fig. 3) formed through such sidewall 14, large enough for readily inserting the fingers of a hand of a grasper (Fig. 2) into the opening 20 intermediate the forward and rearward sidewalls 14, 16.
  • the perforations of the boundary 26 are spaced such that when the tab 24 is held securely by a support, a quick flip of the wrist (after the fingers have been inserted intermediate the forward and rearward sidewalls 14, 16) provides sufficient force for removing such a grasped bag 12 from the tab 24.
  • the hand hole 28 can have a thickened peripheral edge 25 which reinforces the sidewall 14 and prevents tearing the edge 25 when grasped to remove the bag 12; the linear edge 25A is on or above the margin 26 so it remains with the tab 24. It is noted that the gusseted side panels 22 serve to space the sidewalls 14 and 16 from each other to facilitate inserting of the fingers into the opening 20 and behind the forward wall 14.
  • the perforated margin 26 overlies an upper edge 25A of the hand hole 28 (Fig. 1). Accordingly, when the user inserts his fingers through the hand hole 28 (of a bag 12) for the purpose of removing such a grasped bag 12 from the bundle 10 (Fig. 2), the hand hole 28 of the bag 12 (Fig. 3), now removed from the bundle 10, provides the bag 12 with a notch 29 (Fig. 3) along the upper longitudinal end portion of only the forward sidewall 14.
  • the inertia or attraction as between the forward and rearward sidewalls 14, 16, surprisingly, is readily overcome by a quick thrust of the fingers through the hand hole 28.
  • the fingers initially separate upper portions of the forward and rearward sidewalls 14, 16, and subsequent downward disposition of the fingers permits the user to grasp the forward sidewall 14 (preferably along the hand hole 28) for removing the bag 12 from the tab 24 as above described.
  • the bags 12 of the first embodiment of the bag bundle 10 are joined together in a manner such that the tabs 24 are one atop another, and such that the hand holes 28 are uniformly disposed, i.e., preferably directed toward the user (Fig. 2).
  • the tabs 24 are fastened together preferably along an upper transverse line 30 (Figs. 1, 2) located intermediate the perforated margin 26 and an upper edge of each tab 24, thereby forming the first embodiment of the bundle 10.
  • the tabs 24 of the first embodiment moreover, include punched holes 32 preferably through spaced opposite end portions of the tabs joined 24, and further preferably centered on the transverse line 30 for supporting the bundle 10 in a known manner using hooks 34 and a support structure 36 (Fig. 1).
  • the hooks 34 are preferably fastened to the support structure 36 by screws 35.
  • the legs 33A are preferably mounted into a counter top 39 in an upright manner.
  • a second embodiment of a structure 36B (Fig. 6A), also particularly useful for supporting the bag bundle 10, similarly comprises hooks 34A, a single leg 33B and a metal plate 37B serving a function similar to that of the metal plate 37A.
  • the leg 33B similarly is preferably mounted into the counter top 39 in an upright manner.
  • the upper longitudinal edge portions of the forward and rearward sidewalls 14A, 16A respectively include a hand hole 28A and an arcuate tab 24A.
  • the tab 24A integral only with the rearward sidewall 16A, is separable from the rearward sidewall 16A along an arcuate perforated boundary or margin 26A.
  • Bags 12A (of the second embodiment of the bag bundle 10A) are stacked, one atop another, in a manner such that the tabs 24A are one atop another, and such that the hand holes 28A are uniformly disposed.
  • the stacked tabs 24A moreover, preferably include at least one hole 32A formed therethrough for supporting bundle in 10A (substantially as described above, using a single hook 34).
  • the tabs 24A are joined together preferably along the circumference of the holes 32A.
  • the first and second sidewalls 14A, 16A further include elongated patches 41 (preferably plastic) which respectively have been affixed to the first and second sidewalls 14A, 16A intermediate the side panels 22.
  • the patches 41 are located proximate to the hand hole 28A and tab 24A and are transversely disposed relative to the side panels 22.
  • the third embodiment further preferably includes a second hand hole 43 (Fig. 1B) formed through the first and second sidewalls 14A, 16A and centered on the patches 41.
  • the second hand holes 43 are transversely disposed relative to the side panels 22, and serves as a means for carrying the bag 12B when such bag 12B has been removed from its bag bundle 10B and filled with merchandise.
  • the patches 41 serve as a reinforcement for eliminating tearing of the sidewalls 14A, 16A. Accordingly, the thickness of the patches 41 is sufficient for accomplishing such a purpose.
  • the second and third embodiments of the bags 12A and 12B can also have thickened, melt-hardened hand hole edges similar to edge 25 of the first bag 12.
  • edge 25 of the first bag 12 can also have thickened, melt-hardened hand hole edges similar to edge 25 of the first bag 12.
  • the bags 12, 12A and 12B are preferably made of a relatively thin gauge plastic, and are preferably individually heat sealed at the transverse line 19 (Fig. 4) thereby providing each bag 12, 12A and 12B with its respective closed bottom 18.
  • the bags 12, 12A and 12B of each respective bag bundle 10, 10A and 10B, moreover, are fastened together, using commercially available heat-welding apparatus, either along the line 30 or along the circumference of the holes 32A.
  • an extruder 38 which receives plastic material from a source (not shown), extrudes (step 1) a molten form of the plastic material.
  • the extruded plastic material assumes the shape or form of a tube or sleeve 40.
  • Feed rollers 42 (within a tube-transfer station 45) transfer the extruded tube 40 from the extruder 38 to heat sealers 44.
  • the feed rollers 42 of the tube-transfer station 45 serve to flatten the tube 40 as the tube is advanced past the heat sealers 44.
  • the heat sealers 44 are spaced above and below the extruded tube 40, and are spaced transverse to the direction of travel of the extruded tube 40 so as to substantially equally divided (step 2) the extruded tube 40 into a plurality of (in Fig. 5, for example, 3) relatively narrower, longitudinally-joined tubes 46.
  • the tubes 46 are then drawn past cutters 48 which cut (step 3) the tubes 46 along a margin or region 50, where such tubes 46 had been joined.
  • Advancing rollers 49 then assemble individual tubes 46 (now severed one from another) through a tension-adjusting. station 52 preferably comprising five rollers (Fig. 5A) so that each tube 46 can be punched on one side only (Fig. 5A: step 4).
  • FIG. 5A Directing attention to Fig. 5A, it will be seen that within each tube 46 an internal mandrel 54 having an anvil 56 is supported within the tube 46 by support rollers 58.
  • the internal mandrel 54 separates the walls of the tube 46, and changes the shape of the tube 46 from substantially flat (Fig. 7) to relatively open (Fig. 8).
  • a punch 60 external to the tube 46, at predetermined time intervals strikes the mandrel anvil 56 forming the hand hole 28 through one side only of the tube 46 (see Fig. 5).
  • An indexing station 62 advances each tube 46 from its respective mandrel 54 to a folding station 64 where guiding vanes 66 (Figs. 5, 5A) cause folds or gussets to be formed (step 5) in the lateral sides of each tube 46. (These folds or gussets become the side panels 22 when the tubes 46 are later formed into bags 12, 12A or 12B.)
  • the indexing station 62 serves to flatten the tubes 46 as they are drawn over their respective mandrels 54. (As between Figs. 5 and 5A, the tension-adjusting station 52, mandrels 54 and indexing station 62 are included within an area 63.)
  • each tube 46 is advanced by advancing rollers 68 to heat sealers 70 and cutters 72.
  • the function of the heat sealers 70 is to heat seal transversely-disposed, longitudinally-spaced portions of each tube 46, and the function of the cutters 72 is to cut (step 6) each such tube 46 along these transversely-disposed, heat-sealed portions.
  • Each such tube 46 is cut along a longitudinal end portion which is in distal relation to the hand hole 28. See Fig. 5.
  • Severed tubes 46 are conveyed by a conveyer 74 from the heat sealers 70 and cutters 72 to a stacker 76 which causes the severed tubes 46 to become stacked vertically (step 7).
  • the advancing rollers 68 serve to advance the unsevered tubes 46 past the heat sealers 70 and cutters 72.
  • the heat sealers 70 and cutters 72 perform their respective functions upon the tubes 46 at predetermined time intervals.
  • the advancing rollers 68, heat sealers 70 and cutters 72 moreover, cooperate in a manner such that a leading end portion of the unsevered tubes 46 is permitted to be advanced onto the conveyor 74 before the cutters 72 cut such leading end portions from the remainder of each tube 46.
  • a conveyor 80 which operates at predetermined time intervals in cooperation with the stacker 76, receives the severed tubes 46 from the conveyor 74 and permits a quantity (preferably from about 50 to about 100) to accumulate as to each pile of severed tubes 46 (there are 3 such piles: see Fig. 5) before advancing the stacks of tubes 46 from the stacker 76 to the heat sealer 78.
  • the conveyor 80 transfers the joined and severed tubes 46, now unfinished bag bundles 10, to a punch 82 which punches and cuts (step 9) the bag bundles 10, through the leading end portions thereof thereby forming the perforated boundaries or margins 26 and the tabs 24.
  • the punch 82 preferably forms the linear perforated margin 26 when the apparatus (of the present invention) is used to form the first embodiment (Fig. 1) of the present invention.
  • the punch 82 moreover, preferably forms the arcuate perforated margin 26A when the apparatus is used to form the second and third embodiments (Figs. 1A, 1B).
  • the punch 82 is used for forming the holes 32 or 32A through the tabs 24 or 24A of the first or second and third embodiments of the bundles 10 or 10A and 10B of the present invention. Where two holes 32 are formed through the tab 24 (Fig. 1), such holes 32 are preferably spaced at opposite end portions of the transverse line 30 for additional support of the bag bundle 10 by the hooks 34.
  • the punch 82 moreover, cuts each bag 12A or 12B at the upper or leading longitudinal edge 27 thereof (Figs. 1A, 1B).
  • the punch 82 includes means for hot punching the tabs 24A together thereby forming the holes 32A whereby the tabs 24A are joined together at the circumferences of the holes 32A.
  • Figs. 9A, 9B and 9C modifications of the apparatus are illustrated in Figs. 9A, 9B and 9C.
  • Fig. 9A from the tension-adjusting roller 152 an individual tube 146 is advanced and separated by the steel plate 154 of an internal mandrel or former assembly 155.
  • the former plate 154 is mounted on a frame 156 which assembly also secures an upstream roller assembly 158, more fully described with reference to Figs. 12-14, and a downstream roller 160, which are supported on respective support roller assemblies 162 and 164.
  • a pair of reciprocating platens 166 and 168 are arranged in vertical alignment with the former plate 154.
  • the upper wall or web147 travels between the former plate 154 and the upper platen 166.
  • the lower web 148 travels between the former plate 154 and the lower platen 168.
  • the vertically reciprocating motions of the platens 166 and 168 are driven by fast-acting, pneumatic piston-cylinder units 170 and 172, respectively.
  • the lower platen 168 supports a heated melting tool which is generally designated by reference character 174.
  • both the upper platen 166 and lower platen 168 are simultaneously closed upon the respective webs 147 and 148 which are thereby each clamped against the former plate 154.
  • the hot annular edge 176 of the melter 174 just contacts the lower web 148 which is thereby impinged against a Teflon coating 180 on the bottom surface of the former plate 154, the entire area of the plastic web circumscribed by the hot edge 176 is immediately melted and removed within the millisecond time period of the stop cycle.
  • the temperature of the edge 176 will be approximately the melting temperature of the specific type of plastic being fabricated, for example approximately 194° C when high density polyethylene webs are fabricated in typical thicknesses of about 0.4 to 1.25 mil.
  • a thickened bead at the melt-hardened peripheral edge 129 is formed around the resulting hand hole 128 as shown in Fig. 9C.
  • the thickened peripheral edge 129 provides tough, integral reinforcement at the hand hole and prevents the bag wall from ripping at the hand hole when the user pulls the bag from the bundle.
  • the edge 176 applies negligible force against the Teflon®-coated plate 154, the clamping action of the upper platen 166 holds the plate 154 and the webs 147 and 148 stationary without any shifting to ensure registry of the edge 176 with the precise location for melting and removal of the plastic material to produce the hand hole 128 so that the upper edge thereof is coextensive with or above the correct line of margin, for example, perforated margin 26 in the first embodiment of the bundle 10 in Fig. 1.
  • the lower surface of the upper platen 166 is covered with a rubber sheet 167 which promotes the interfacial purchase with the upper web 147 during the stop cycle.
  • the instantaneously melted film area 182 is removed in downward motion under the combined action of gravity and the inward shrinking of the film melt with surface tension promoted by a downward flaring or reverse inside taper of the interior wall 178 of the melter tool 174 through which the generally vertical passageway 184 is formed, as more fully illustrated in Figs. 10 and 11.
  • the Teflon coating 180 also promotes the instantaneous release of the melt so that the film can advance at high speed as the platens are withdrawn as shown in Fig. 9C.
  • the passageway 184 is downwardly extended entirely through the tool 174, through a heat insulation layer 186 between the tool 174 and the platen 168, and further extending through the platen 168 itself to an opening 188 at the bottom of the platen.
  • the melt adheres to the interior wall 178 of the tool 174 and therefore creates a progressive build-up of melt resulting from the high frequency of removal cycles
  • the gradual descent of the melt build-up through the passageway 184 allows increased cooling and hardening of the melt so that eventually the motion of the platen 168 will produce fracture and discharge of the hardened melt 189 from the opening 188 in the platen 168 without interference from the drive piston 172 which is offset from the opening 188. Consequently, removal of the melt from the lower web 148 does not require additional discharge equipment at very high cycle frequencies.
  • the melter 174 includes a pair of generally cylindrical, electrical resistance heaters 190 which extend through a heat-conducting base 192.
  • the heaters 192 are aligned horizontally parallel so that the longitudinal dimension of the passageway 184 is positioned between the heaters 192.
  • the heated wall 178 upstanding from the base 192 has an interior surface which tapers upwardly toward the opening edge 176 which forms the outline for the hand hole 28.
  • the melter 174 is mounted on the lower platen 168 from which it is separated by the heat insulation layer 186.
  • the lower platen 168 includes upper and lower plates 194 and 196, respectively, on which are secured the opposite ends of multiple helical, or hair, springs 198, two of which are shown in the sectional view of Fig. 11.
  • the springs 198 regulate the very light pressure with which the heated edge 176 impacts the lower web 148 and then the Teflon® coating 180 following the instantaneous melting, in order to prevent excessive impact force which could produce denting in the Teflon coating in a short period of time since the impacts are repeated at a very high cycle frequency.
  • the springs 198 thus provide the lower platen 168 with a floating action which is coordinated with the stop position at the top of the pneumatic piston upstroke closing the lower platen 168, in order to protect both the fine ground edge 176 and the Teflon coating 180.
  • the upstream roller assembly 158 includes a segmented, stationary bearing shaft which is mounted at opposite ends on the frame 156 which carries the former plate 154.
  • the lower web 148 is advanced between the lower set of rollers 208 and a pair of supporting rollers 210 (shown as part of assembly 162 in Fig.
  • the operating position of swing-arm roller 212 and the supporting rollers 210 are vertically spaced sufficiently closely to prevent the roller assembly 158 from passing between in the horizontal direction of the web advancement; this relative spacing provides the restraint on the roller assembly 158 and the former assembly 155 to oppose the horizontal force exerted by the webs 147 and 148 which are accelerated from stop to high speed advancement, for example, 260 feet per minute, in millisecond cycle times. Because the acceleration and deceleration of the webs is generated at such high frequency, the former assembly 155 must be light in order to provide as small inertia as possible to prevent excessive stretching or distortion of the plastic webs of film.
  • the rollers 206, 208, and 160 of the former assembly 155 all have small diameters and produce little friction or resistance to the advance and stop of the film.
  • a fourth embodiment of a bag bundle 10C is similar to the first bag bundle 10 shown in Fig. 1, with the same reference numerals designating like features.
  • the margin line 126 is a cut line through both the left and right lateral portions of the bundle 10C (including cuts through all of the gussets 22); however, a medial portion 126a of the line 126 is a perforated line, or series of spaced perforations, similar to perforated line 26 of the bundle 10. Consequently, the combined knife and punch 82, described with reference to step 9 in Figs. 5 and 5A, will be modified in configuration accordingly.
  • the perforated line 126a is aligned within the expanse of the hand hole 28, parallel to and below the linear, upper portion 25A of the peripheral edge 25, and preferably terminates between the gussets 22. Consequently, the perforated line 126a is formed only in the rearward sidewall 16C of each bag 12C in the bundle 10C.
  • the important benefit from locating the perforated margin line 126a only in the rearward sidewall 16C is illustrated in Fig.
  • the cut lines 126 allow the forward sidewall 14C of the leading bag 12C to extend outwardly from the bundle 10C, augmented by the natural expansion of the gussets 22 when incorporated, as in the illustrated embodiment.
  • the separation and outward extension of the forward sidewall 14C and the gusset 22 not only promote access to the peripheral edge 25 of handle 28, but also promote opening of the bag which reduces the time and effort required by the user to open the bag, often using a single hand.
  • the perforated line 126a in the illustrated embodiment of the bundle 10C is terminated between the gussets 22, which extend to the interior of the hand hole 28.
  • the perforation line 126a can extend transversely beyond the lat eral portions of the peripheral edge 25 of the hand hole 28, thus forming lines of perforation in the forward sidewall 14C which then must be torn to detach the bag, similar to the bundle 10 of Fig. 1.
  • the cut lines 126 can also be abbreviated to provide additional perforated line portions at the free side edges of the bag, for example when very large bags may require increased attachment to the supporting tabs.
  • the perforated lines 126a must be on or below the linear peripheral edge 25A so that edge 25A remains with the tab 24C when the line 126a is torn to detach the bag from the bundle.
EP87309344A 1986-10-24 1987-10-22 Sacs en liasse et procédé de fabrication Withdrawn EP0267706A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US92274886A 1986-10-24 1986-10-24
US922748 1986-10-24

Publications (1)

Publication Number Publication Date
EP0267706A1 true EP0267706A1 (fr) 1988-05-18

Family

ID=25447541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87309344A Withdrawn EP0267706A1 (fr) 1986-10-24 1987-10-22 Sacs en liasse et procédé de fabrication

Country Status (4)

Country Link
EP (1) EP0267706A1 (fr)
DK (1) DK556287A (fr)
FI (1) FI874667A (fr)
NO (1) NO874434L (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377416A1 (fr) * 1989-01-04 1990-07-11 Generatori Elettronici Alta Frequenza G.E.A.F. S.R.L. Installation pour la fabrication en continu de sacs en utilisant du polypropylène, polythène, PVC ou matériaux plastiques similaires
US7775716B2 (en) 2004-05-26 2010-08-17 Kee Plastics Ab Piping bag, blank for manufacturing a piping bag and method of manufacturing a piping bag

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2227108A1 (en) * 1973-04-26 1974-11-22 Dajem Sa Punching through flattened plastic tube - using device for ensuring punching of one tube side only
US4046257A (en) * 1971-08-17 1977-09-06 Hans Lehmacher Pad-stacked bags or similar packaging, and apparatus and method for fabricating the same from plastic film
CH591316A5 (en) * 1975-05-20 1977-09-15 Zehnder Ag Geb Tool for piercing holes in synthetic film - has lightly contacting melting ring sucking blank from hole and aids in applying price tickets to packets
WO1984000322A1 (fr) * 1982-07-19 1984-02-02 Paper Converting Newcastle Pty Sac, dispositif de fabrication de sac et procede d'utilisation
US4500000A (en) * 1984-03-12 1985-02-19 Hercules Membrino Pad of plastic bags with support means
EP0136171A2 (fr) * 1983-09-26 1985-04-03 William F. Brown Paquet de sacs, procédé et dispositif de fabrication de ce paquet

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US4046257A (en) * 1971-08-17 1977-09-06 Hans Lehmacher Pad-stacked bags or similar packaging, and apparatus and method for fabricating the same from plastic film
FR2227108A1 (en) * 1973-04-26 1974-11-22 Dajem Sa Punching through flattened plastic tube - using device for ensuring punching of one tube side only
CH591316A5 (en) * 1975-05-20 1977-09-15 Zehnder Ag Geb Tool for piercing holes in synthetic film - has lightly contacting melting ring sucking blank from hole and aids in applying price tickets to packets
WO1984000322A1 (fr) * 1982-07-19 1984-02-02 Paper Converting Newcastle Pty Sac, dispositif de fabrication de sac et procede d'utilisation
EP0136171A2 (fr) * 1983-09-26 1985-04-03 William F. Brown Paquet de sacs, procédé et dispositif de fabrication de ce paquet
US4500000A (en) * 1984-03-12 1985-02-19 Hercules Membrino Pad of plastic bags with support means

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377416A1 (fr) * 1989-01-04 1990-07-11 Generatori Elettronici Alta Frequenza G.E.A.F. S.R.L. Installation pour la fabrication en continu de sacs en utilisant du polypropylène, polythène, PVC ou matériaux plastiques similaires
US7775716B2 (en) 2004-05-26 2010-08-17 Kee Plastics Ab Piping bag, blank for manufacturing a piping bag and method of manufacturing a piping bag
US8322926B2 (en) 2004-05-26 2012-12-04 Kee Plastics Ab Piping bag, blank for manufacturing a piping bag and method of manufacturing a piping bag

Also Published As

Publication number Publication date
FI874667A (fi) 1988-04-25
DK556287A (da) 1988-04-25
NO874434L (no) 1988-04-25
NO874434D0 (no) 1987-10-23
DK556287D0 (da) 1987-10-23
FI874667A0 (fi) 1987-10-23

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