EP1375366A1 - Verpackungsbeutel sowie Verfahren und Vorrichtung zu dessen Herstellung - Google Patents

Verpackungsbeutel sowie Verfahren und Vorrichtung zu dessen Herstellung Download PDF

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Publication number
EP1375366A1
EP1375366A1 EP03011985A EP03011985A EP1375366A1 EP 1375366 A1 EP1375366 A1 EP 1375366A1 EP 03011985 A EP03011985 A EP 03011985A EP 03011985 A EP03011985 A EP 03011985A EP 1375366 A1 EP1375366 A1 EP 1375366A1
Authority
EP
European Patent Office
Prior art keywords
bag
ply
tubular film
film material
edge
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Withdrawn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
EP03011985A
Other languages
English (en)
French (fr)
Inventor
Francesco Robbiati
Antonio Montalbano
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.)
Cryovac LLC
Original Assignee
Cryovac LLC
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
Priority claimed from EP02254428A external-priority patent/EP1375365A1/de
Application filed by Cryovac LLC filed Critical Cryovac LLC
Priority to EP03011985A priority Critical patent/EP1375366A1/de
Publication of EP1375366A1 publication Critical patent/EP1375366A1/de
Withdrawn legal-status Critical Current

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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
    • B65B9/06—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
    • 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
    • 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
    • B65D33/007—Details of, or accessories for, sacks or bags for facilitating the separation of the two walls, e.g. walls of inequal height, tabs; for maintaining the mouth of the sack or bag open
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/002—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers in shrink films
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5827—Tear-lines provided in a wall portion
    • 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/16—Cutting webs
    • B31B70/18—Cutting webs longitudinally
    • 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
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B31B70/642—Uniting opposed surfaces or edges; Taping by applying heat or pressure using sealing jaws or sealing dies
    • 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
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings

Definitions

  • the present invention relates to a packaging bag, particularly a transverse- or side-sealed bag of plastics film.
  • a further object of the present invention is to provide a method of producing packaging bags which are resistant to the curling problem of the prior art.
  • Yet a further object of the present invention is to provide an apparatus for producing packaging bags which are resistant to this curling problem.
  • a packaging bag comprising opposed first and second film plies joined at a closed end of the bag and sealed along lateral edges of the bag, said plies defining an open mouth end having a first edge of the first ply and a second edge of the second ply which projects beyond the first edge of the first ply and comprises a folded over film portion to exhibit double thickness at the exposed end of the second ply, wherein the margin of the folded over portion of the second ply is disposed adjacent to the first edge of the first ply so as to provide a substantially constant thickness of the bag across the mouth and the projecting portion.
  • the turned over lip defines the mouth edge of a longer side of the bag which thus slightly projects beyond the edge of the shorter opposite side of the bag.
  • the turned over lip also therefore presents a rigidifying effect, which is particularly helpful in the case of packaging bags with a thickness at the smaller end of the available range of materials to be used, i.e. a light weight of film.
  • the packaging bags according to this first aspect may be presented as discrete, separate, bags, possibly reassociated in shingled or imbricated form on guide tapes, or stacked vertically and delivered as a wicket of stacked bags. They may also be presented in the form of a continuous strip of contiguous bags that can be easily separated one from the other, e.g. due to the presence of weakening lines such as pre-perforated lines, positioned between the transverse seals of each bag and the transverse seals of the immediately preceding and following bags.
  • a further aspect of the present invention provides an apparatus for manufacturing a bag according to the first aspect, comprising means for feeding a flattened tubular film material, having first and second marginal folds, along a film path, means for transversely sealing said flattened tubular film at regularly spaced locations to define the joins between contiguous transverse-sealed bags formed from said tubular film material, means for taking up said succession of transverse sealed bags from said transverse sealing station, and means for slitting one flat wall of said flattened tubular film material in proximity of said first fold of said film material to define said second mouth edge extending beyond said first mouth edge, said slitting means being mounted upstream of said transverse sealing station.
  • a third aspect of the present invention provides a method of manufacturing a bag according to the first aspect, comprising feeding a flattened tubular film material along a machine direction while exhibiting first and second superposed plies extending between first and second marginal folds of said tubular film material, slitting said first ply in proximity of said first marginal fold of said flattened tubular film material while leaving said second ply unslit whereby said second ply has a turned over edge at said first marginal fold of the tubular film material, downstream of said slitting station transversely sealing said tubular film material along a plurality of regularly spaced transverse seal lines which extend into said second ply at said turned over edge in proximity to the first marginal fold of the tubular film material, and delivering the plurality of transverse-sealed packaging bags thus formed.
  • a fourth aspect of the invention provides a method of packaging, comprising taking a bag according to the first aspect, or a bag made by the method of the third aspect, and pneumatically inflating the mouth of said bag to separate the edge of said shorter first ply from said projecting edge of the second ply to initiate opening of the bag, and subsequently holding the bag open and introducing a product article into a respective said open bag.
  • the improved packaging bag shown in Fig. 1 is a transverse- or side-sealed bag 1 having a closed end 1a at which are joined together first and second superposed main panels 2 and 3 which are sealed along opposite edges 4 and 5 by a heat-sealing operation.
  • the closed end 1a is a first fold in the film material providing the two plies defining the panels 2 and 3.
  • the mouth of the bag is at the end opposite the closed end 1a and is formed by a singly folded portion 7 of the second main panel 3 and a cut edge 6 of the first main panel 2.
  • the manufacture of the mouth end involves slitting the flattened tubular film of the plastic material used for the bag (12 in Figs. 3 and 4) in proximity of the second of the two folds thereof, the first fold being to define the closed end 1a, described above, of the bag.
  • the production of the mouth end involves forming a cut at 7a in one of the two flat plies of the flattened tubular film in proximity to the second fold 7 referred to above, in order to separate the first main ply from the co-planar folded over part of the film margin at the fold 7.
  • the folded end of the second main ply exhibits a double thickness of the film in one wall which projects beyond the end 6 of the first main ply (other wall), thereby (i) allowing easier pneumatic inflation of the bag mouth in order to open the bag 1 for loading purposes, and (ii) resisting wrinkling in that the increase in thickness of the end of the panel 3 at the folded end of the second ply helps to resist the tendency, which the bag material would otherwise have, to curl, as described above.
  • the bag mouth is created by cutting only one of the plies of the flattened tubing along a line which is parallel to and in proximity of the second of the two longitudinal folds of the flattened tubing, no material is removed and the transverse seals to give the discrete bags are made directly on the longitudinally (machine direction) tensioned slit tubing. Therefore, there will be essentially a zero space between the edge 6 of the first ply and the margin 7a of the folded over portion of the second ply, i.e. said two edges will be adjacent one to the other.
  • seal lines 8, 9a and 9b Close to the end 1a of the bag are optional seal lines 8, 9a and 9b the purpose of which will be described later.
  • the film used for manufacturing the bag 1 may be a mono-layer film, but is preferably a multi-layer film having different functions for the individual layers of the bag.
  • one of the intermediate layers of the bag material may be a barrier layer in order to control the transmission of gas (for example O 2 ) between the interior and exterior of the bag when sealed
  • another of the layers of the bag material on the inside of bag will be a sealing layer facilitating sealing to a similar material for the purposes of closing the bag when loaded
  • a third layer will be an abuse-resistant layer giving strength to the bag material.
  • Other functions may also be provided, for example there may be tie layers between any of the above mentioned layers.
  • the thickness of films suitable for the manufacture of transverse-sealed bags is typically comprised between about 35 and about 120 ⁇ m, preferably between about 40 and about 100 ⁇ m. Thicker films as well as thinner films, e.g. films 15, 20, 25, 30 ⁇ m thick may however be employed in the process of the present invention.
  • Figs. 1 and 2 The apparatus for producing a bag of the type shown in Figs. 1 and 2 will now be described with reference to Figures 3 and 4, Fig. 3 showing a prior art apparatus for manufacturing a continuous strip of transverse- or side-sealed contiguous packaging bags, and Fig. 4 showing a modification which produces the bags in accordance with the present invention.
  • FIG. 3 there is shown bag making apparatus 10 which processes a flattened tubular film 12 which may either have come straight from a bubble extrusion manufacturing plant or may have been previously formed by bubble extrusion and then rolled up for reuse at a later date at which point the roll is unwound so that the film can be fed to the bag making apparatus 10.
  • the tubular material 12 arrives at a bag opening station 14 which includes a horizontally arranged knife blade 16 which can serve to slit the film 12 at the right-hand marginal fold as shown in Fig. 3.
  • the film 12 arrives at an optional air introduction station 18 including an air nozzle 20 which is supported on the machine frame and is cantilevered to extend across the width of the flat folded film to introduce air near the left-hand fold line (which corresponds to the closed end 1a in Figs. 1 and 2). This may be helpful in case bags with the optional EZO feature, which will be described later, are manufactured.
  • the film 12 arrives at a bottom forming station 22 which is optional but which in the present embodiment creates the seal lines 8, 9a and 9b to provide a particular easy open (EZO) configuration to the closed or bottom end of the bag so that the bag is substantially in accordance with US-A-6,260,705.
  • EZO easy open
  • the already slit film material then arrives at a transverse sealing station 24 including vertically closable and openable seal bars 26 and 28 which operate in synchronisation with stepwise advance of the tubular film material 12 so as to define a plurality of spaced transverse seal lines 30 which each include two spaced lines parallel sealing contiguous bags, one of such lines being associated with each of the contiguous bags, and between them a perforation line to allow the bags to be separated from one another at a downstream station.
  • the bag material just at the slitting station 14 and downstream therefrom undergoes considerable curling particularly at the mouth end of the bag, and this results in pleats and wrinkles at the transverse sealing operation at station 24, particularly when the film material is of a heat shrinkable nature.
  • the selvage 34 of the film material along the right-hand fold of the tubular material 12 is removed in its entirety by means of a vertically aligned trimming knife blade 32 which separates the selvage 34 to be sucked into an aspiration nozzle 36.
  • the chain of perforated and transverse-sealed bags downstream of the knife 32 can then either be wound up for subsequent use, or be separated and reassociated in shingled or imbricated form on guide tapes, or possibly stacked vertically and delivered as a wicket of stacked bags, depending upon the type of bag loader for which they are to be used.
  • the mouth of the bag along the right-hand edge, corresponding to the right-hand end 7 of the bag in Figs. 1 and 2 is closed by any convenient mechanism, preferably by heat seal bars, and then the bag can be subjected to a heat-shrinking operation which serves to tidy the structure of the bag around a product article which was loaded therein before the bag closing operation.
  • the shrinking operation also results in formation of loose tabs or ears, illustrated by the portions 8a and 8b (Fig. 1) of the bag bottom to either side of the central V-notch shown therein (defined by the seal lines 9a and 9b), at which tearing of the bag can be initiated by pulling the two ears 8a and 8b apart from one another.
  • This particular easy open feature is very useful for a shrink package but, as indicated above, is optional and can be used with or without the curl-preventing mouth structure in accordance with the present invention.
  • Fig. 4 The difference between the prior art apparatus of Fig. 3 and the embodiment of the present invention shown in Fig. 4, which provides a bag in accordance with the present invention, resides in the fact that the film opening station 14 of Fig. 3 is replaced by a modified bag slitting station in Fig. 4, where the knife blade 17 is vertically aligned as compared with the horizontal alignment of the knife blade 16 at the film slitting station 14 of Fig. 3.
  • the tube-slitting blade 17 is associated with a support 19 which carries both the knife blade 17 on the outside of the tubular film material 12 and an anvil (46 in Fig. 5) inside the tubular material so that the blade 17 can form a slit (illustrated at 7a in Fig.
  • this slit 7a formed by the knife blade 17 in Fig. 4 forms, at a single stroke, the bag mouth in accordance with the present invention.
  • the support 19 carrying the tube-slitting blade 17 and the anvil 46 is mounted on the machine frame so as to be released when desired, and so as to be adjustable in position in a direction transverse to the machine direction (i.e. to the direction of movement of the film web 12).
  • the apparatus of Fig. 4 again includes the optional bottom-forming station 22 which may be used in conjunction with the optional air-introduction station 18 also shown in Figure 3.
  • the optional air introduction station 18 can be located on the carrier 19 of the slitting station 15.
  • the air introduction station 18 it is equally possible for the air introduction station 18 to be positioned downstream of the slitting station 15 but upstream of the optional bottom forming station 22.
  • the transverse sealing station 24 in Fig. 4 is identical to that of Fig. 3 and will not be described in more detail.
  • a further difference between the device of Fig. 4 in accordance with the present invention and the prior art embodiment of Fig. 3 is that there is no longer any need to remove the selvage material as shown at 32, 34, 36 in Fig. 3 because the reinforcement of the mouth portion, relying on the staggered mouth edges 6 and 7 (Fig. 2) and the folded over configuration of the projecting edge 7 (Fig. 1), rigidifies the bag structure sufficiently to eliminate the curling, and the absence of curling can be readily appreciated from the drawing of Fig. 4.
  • the perforated chain of bags delivered at the far end of the apparatus as viewed in Fig. 4 can then either be immediately separated into individual bags for wicketing or imbricating or can remain as a chain of transverse-sealed bags for rolling up and storage.
  • Both the Fig. 3 prior art embodiment and the Fig. 4 embodiment of the present invention include also a mouth separating blade 40 which serves merely to hold the right-hand edges of the upper 2 and lower 3 plies of the folded film 12 apart from one another and to guide them into the area between the jaws 26 and 28 of the transverse sealing station 24.
  • the sealing station 24 in Fig. 4 operates in an intermittent manner synchronously with the stepwise movement of the bag chain.
  • the modified apparatus 11 of Fig. 4 is threaded up in a similar manner except that the combined tube slitting station 15 and the optional air introduction station 18 provide for (i) the support 19 with the blade 17 to be removed from the bag path and for the nozzle then to be introduced between the opposed plies 2 and 3 of the centre folded film 12 once a slit (7a in Fig. 2) has been formed manually, and (ii) the air introduction station 18 (where fitted) to be similarly removed and then replaced after slitting the tube manually.
  • the film material can then be advanced such that the anvil (46 in Fig.2) at the slitting station 15 and the air nozzle 20a of the optional air introduction station 18 can be introduced into the space between the two opposed plies (2 and 3 in Fig.
  • the anvil 46 and the slitting blade 17 of Fig. 4 are also adjustable in a direction perpendicular to the machine direction for accommodating flattened tubular films 12 of different widths.
  • the length of the transverse-sealed bags (that corresponds to the width of the flattened tubing 12) is typically comprised between about 15 and about 65 cm, preferably between about 16 and about 60 cm, and more preferably between about 18 and about 50 cm.
  • the distance between the cut edge 6 of the first main panel 2 and the fold 7 of the second main panel 3, that corresponds to the length of the turned over lip, is typically below about 5 %, and preferaby below about 3 % of the total length of the bag.
  • the length of the turned over lip is anyway less than 1 cm, more preferably less than 0.8 cm and even more preferably less than 0.5 cm.
  • the bag represented in Fig. 1 is 18 cm long and has a turned over lip of 0.4 cm, corresponding to less than 3 % over the total length of the bag.
  • the slitting blade will thus be positioned at a distance from the second fold 7 of the flattened tubing 12 that corresponds to the desired length of the turned over lip, i.e. preferably less than 1 cm, more preferably less than 0.8 cm and even more preferably less than 0.5 cm.
  • Fig. 5 shows the knife blade 17 on the carrier 19 and in the process of forming the cut 7a in the upper ply 2 of the material 12a and leaving the underneath ply 3 uncut.
  • the sub-carrier 42 is bolted to the main carrier 19 by means of bolts (not shown) which engage in holes 44 of the main carrier 19.
  • the entire carrier 19 is releasably mounted on the machine frame so that it can be introduced into the already slit tubular film so that subsequent operation of the apparatus will continue the slitting action.
  • the carrier 19, and the sub-carrier 42 and the air introduction nozzle 20a carried thereby, are in this way able to be rigidly mounted on the machine frame once it has been introduced into the already pre-positioned tubular film.
  • the lower film ply 3 is shown in section along its entire length in Fig. 5 and the upper film ply 2 is only shown in section up to the point where it arrives at the tip of the slitting blade 17. Thereafter it has been slit and the exposed face 6 of the ply 2 can be seen, except where it is concealed behind the rear surface of the main carrier 19.
  • Fig. 1 shows this optional characteristic as comprising a first seal line 8 which is parallel to and disposed inwardly of the fold defining the bottom end 1a of the bag, and a pair of additional seal lines 9a, 9b which start from the bottom end 1a of the bag and converge towards one another in a direction towards the seal line 8.
  • these additional lines 9a and 9b meet at the seal line 8, but this is not essential to the operation of the easy open means defined by the lines 8, 9a, 9b.
  • An "easy-open” (EZO) pre-cut line 9c extends longitudinally of the bag (i.e. perpendicularly to the seal line 8 and to the bottom end 1a of the bag so as to define a point of initiation of a tear when the bag is to be open. This opening operation will occur after the open end of the bag at 6, 7 has been sealed and the thus sealed bag has been subjected to a shrinking operation.
  • the bag closing operation involves placing the loaded bag into a vacuum chamber which exposes the exterior of the sealed bag to reduced pressure causing the bag to balloon slightly, and causing the sealed pockets 8a, 8b of the bottom end of the bag to inflate slightly to present the tabs or ears mentioned above.
  • the thus partially evacuated and sealed bag is subjected to a heat shrinking operation, either in a hot air shrink tunnel or in a shrink bath, whereupon the bag material between the seal line 8 and the closed mouth end of the bag will hug the contours of the product within the bag to provide a tidy package, but the pockets 8a, 8b will protrude from the surface, in the manner described in US-A-6,260,705.
  • perforation line 9c is optional, and that instead some other form of tear-initiating formation could be provided.
  • a hole is formed centrally in the triangular region defined between the fold line 1a of the tubular film material and the converging additional seal lines 9a, 9b.
  • tear-initiating means could be omitted and one could rely simply on the fact that it is easy to apply tearing tension to the film material simply by grasping the two ears defined by the pockets 8a, 8b and pulling them apart.
  • the tear-initiating bottom formation 8, 8a, 8b, 9a, 9b, 9c is optional and it would have been possible for the bag to be finished with simply the fold line 1a defining the closed end of the product compartment of the bag.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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EP03011985A 2002-06-25 2003-05-28 Verpackungsbeutel sowie Verfahren und Vorrichtung zu dessen Herstellung Withdrawn EP1375366A1 (de)

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Cited By (1)

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CN115489774A (zh) * 2022-09-16 2022-12-20 安徽博日生物科技有限公司 一种转盘式提取管自动灌装封膜设备及方法

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US2873566A (en) * 1957-07-01 1959-02-17 Amsco Packaging Machinery Inc Merchandise container and method of making a merchandise package therefrom
US3358906A (en) * 1966-12-29 1967-12-19 Lamson Paragon Ltd Heat sealable plastic material bags for coins
DE1486527A1 (de) * 1965-12-20 1969-04-24 Mittelrheinische Plastik Gmbh Tragetasche aus thermoplastischem Kunststoff
DE1940404A1 (de) * 1969-08-08 1971-04-22 Herkules Papiersackfabriken Br Behaeltnis in Form eines Sackes,Beutels od.dgl. aus Kunststoffolie und Verfahren zu seiner Herstellung
US3647060A (en) * 1969-03-25 1972-03-07 Mobil Oil Corp Roll double-pocketed bag structures
GB2128575A (en) * 1982-10-04 1984-05-02 Grace W R & Co Taped multibags
US4616472A (en) * 1985-10-10 1986-10-14 W. R. Grace & Co., Cryovac Div. Method and apparatus for loading side-seal bags
JPH03251163A (ja) * 1990-02-28 1991-11-08 Eikou Kikaku:Kk 煙草吸いがら入れ用袋の製造法
JPH0928436A (ja) * 1995-05-15 1997-02-04 Ikeda Takahiro 傘 袋
DE19618814A1 (de) * 1996-05-10 1997-11-13 Auto Cover Gmbh Produktion Und Verfahren zum Herstellen und Bereitstellen von Fahrzeugsitz-Schutzbezügen
US6260705B1 (en) * 1999-11-15 2001-07-17 Cryovac, Inc. Heat shrinkable pouch
US6363694B1 (en) * 1998-04-06 2002-04-02 International Paper Company Bag for use in an automatic bag filling process

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US2873566A (en) * 1957-07-01 1959-02-17 Amsco Packaging Machinery Inc Merchandise container and method of making a merchandise package therefrom
DE1486527A1 (de) * 1965-12-20 1969-04-24 Mittelrheinische Plastik Gmbh Tragetasche aus thermoplastischem Kunststoff
US3358906A (en) * 1966-12-29 1967-12-19 Lamson Paragon Ltd Heat sealable plastic material bags for coins
US3647060A (en) * 1969-03-25 1972-03-07 Mobil Oil Corp Roll double-pocketed bag structures
DE1940404A1 (de) * 1969-08-08 1971-04-22 Herkules Papiersackfabriken Br Behaeltnis in Form eines Sackes,Beutels od.dgl. aus Kunststoffolie und Verfahren zu seiner Herstellung
GB2128575A (en) * 1982-10-04 1984-05-02 Grace W R & Co Taped multibags
US4616472A (en) * 1985-10-10 1986-10-14 W. R. Grace & Co., Cryovac Div. Method and apparatus for loading side-seal bags
JPH03251163A (ja) * 1990-02-28 1991-11-08 Eikou Kikaku:Kk 煙草吸いがら入れ用袋の製造法
JPH0928436A (ja) * 1995-05-15 1997-02-04 Ikeda Takahiro 傘 袋
DE19618814A1 (de) * 1996-05-10 1997-11-13 Auto Cover Gmbh Produktion Und Verfahren zum Herstellen und Bereitstellen von Fahrzeugsitz-Schutzbezügen
US6363694B1 (en) * 1998-04-06 2002-04-02 International Paper Company Bag for use in an automatic bag filling process
US6260705B1 (en) * 1999-11-15 2001-07-17 Cryovac, Inc. Heat shrinkable pouch

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PATENT ABSTRACTS OF JAPAN vol. 1997, no. 06 30 June 1997 (1997-06-30) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115489774A (zh) * 2022-09-16 2022-12-20 安徽博日生物科技有限公司 一种转盘式提取管自动灌装封膜设备及方法
CN115489774B (zh) * 2022-09-16 2024-06-04 安徽博日生物科技有限公司 一种转盘式提取管自动灌装封膜设备及方法

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