CA2128261C - Multiwall bag - Google Patents
Multiwall bag Download PDFInfo
- Publication number
- CA2128261C CA2128261C CA 2128261 CA2128261A CA2128261C CA 2128261 C CA2128261 C CA 2128261C CA 2128261 CA2128261 CA 2128261 CA 2128261 A CA2128261 A CA 2128261A CA 2128261 C CA2128261 C CA 2128261C
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- CA
- Canada
- Prior art keywords
- inner tube
- outer tube
- tube
- container
- flap members
- 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.)
- Expired - Lifetime
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Abstract
A container apparatus and method of manufacture for same, in which the container includes an inner tube formed of plastics material, and an outer tube of one of more plies of material.
The container is generally configured to lie flat, when in its unfilled condition. The container has a flat first end formed from flap members configured from one or more plies of the outer tube. The container is advantageously configured to enable open-ing of the first end of the outer tube to provide access to the inner tube.
The container is generally configured to lie flat, when in its unfilled condition. The container has a flat first end formed from flap members configured from one or more plies of the outer tube. The container is advantageously configured to enable open-ing of the first end of the outer tube to provide access to the inner tube.
Description
21~8~6l BACRGRO~N~ 0~ THE lNvk~rlON
~ he present inven~ion relates to improvements in and or relating to bags of ~ultiple plies, apparatus for manufacturing same, methods of manufacturirg sa~e, uses thereof and related means and methods.
~ any forms of ~ag containers for~ed of multiple ~lies are known. Many of these are in the form of a multiwall bag sometimes with a plastics ma~erial inner liner. The present invention i5 directed to improvemen~s in such a cont~iner and is adapted to pro~ide at least some custo~er choice in relation to containers of that type.
A prior art form of construction is that as hereina~ter described and the present invention is prefera~ly directed to a form o such container where no ~ase patch is required that is separate from the plies of the outer tube of such a container and~or which, upon opening, will minimize loose pieces of ~aterial.
It is, therefore, an object of the present invention to go at least some way to ~eet the above-mentianed objects or at least provide the public with a use~ul choice.
8~
SUMMARY OF THE INVENTION
In a first aspect the invention consists in a lie flat container (e.g. a bag) having a tube (extruded or fabricated) of a sealable plastics ~aterial (hereafter "the inner tube"~
disposed within an exterior tube (hereafter "t~e outer tube"), each tube having been formed of at least one we~ of a planar ~aterial ~preferably paper or ~ultiple plies of paper), the same end (bereafter the ~first" or "factory" end) of each of the inner tube and outer tube being separately closed while the other end of each of the in~er tube and outer tube is open (hereafter the "second" or "cu~tomer" end) to allow the ~illing of the inner tube prior to the sealing thereof, and wherein, in its lie flat, un~illed condition, ea~h tube simply lies as a si~ple fold connected front and back panel except at the factory end where the outer tube at least has been conformed from factory end regions of the front and back panels of the outer tube to a su~stantially plana~ base region dieposed in a lie flat condition over one or other of the front or back panels of the outer tube, said ou~er tube at said factory end being held closed at least primarily by overlying ~laps from the factory end extremit~ of each of the front and ~ack panels, the flaps while adhered o~e to the other being capable of being peel separated so that, in use, if desired, the filled and sealed inner tube, if not pe~manently attached to the outer tube at the customer end, can be removed from the factory end after the peel separation of ~he flaps tc allow opening of the outer tube at the factory end.
In a preferred ~o~ nt of the invention, the container is in the form of a bag, ~ith the exterior tube being formed from paper, preferably from multiple plies of paper. Preferably, the inner tube at the c~sto~er end is adhered at leact in a tack ~anner to the outer tube at the customer end to facilitate filling of the inner tube.
~ he present inven~ion relates to improvements in and or relating to bags of ~ultiple plies, apparatus for manufacturing same, methods of manufacturirg sa~e, uses thereof and related means and methods.
~ any forms of ~ag containers for~ed of multiple ~lies are known. Many of these are in the form of a multiwall bag sometimes with a plastics ma~erial inner liner. The present invention i5 directed to improvemen~s in such a cont~iner and is adapted to pro~ide at least some custo~er choice in relation to containers of that type.
A prior art form of construction is that as hereina~ter described and the present invention is prefera~ly directed to a form o such container where no ~ase patch is required that is separate from the plies of the outer tube of such a container and~or which, upon opening, will minimize loose pieces of ~aterial.
It is, therefore, an object of the present invention to go at least some way to ~eet the above-mentianed objects or at least provide the public with a use~ul choice.
8~
SUMMARY OF THE INVENTION
In a first aspect the invention consists in a lie flat container (e.g. a bag) having a tube (extruded or fabricated) of a sealable plastics ~aterial (hereafter "the inner tube"~
disposed within an exterior tube (hereafter "t~e outer tube"), each tube having been formed of at least one we~ of a planar ~aterial ~preferably paper or ~ultiple plies of paper), the same end (bereafter the ~first" or "factory" end) of each of the inner tube and outer tube being separately closed while the other end of each of the in~er tube and outer tube is open (hereafter the "second" or "cu~tomer" end) to allow the ~illing of the inner tube prior to the sealing thereof, and wherein, in its lie flat, un~illed condition, ea~h tube simply lies as a si~ple fold connected front and back panel except at the factory end where the outer tube at least has been conformed from factory end regions of the front and back panels of the outer tube to a su~stantially plana~ base region dieposed in a lie flat condition over one or other of the front or back panels of the outer tube, said ou~er tube at said factory end being held closed at least primarily by overlying ~laps from the factory end extremit~ of each of the front and ~ack panels, the flaps while adhered o~e to the other being capable of being peel separated so that, in use, if desired, the filled and sealed inner tube, if not pe~manently attached to the outer tube at the customer end, can be removed from the factory end after the peel separation of ~he flaps tc allow opening of the outer tube at the factory end.
In a preferred ~o~ nt of the invention, the container is in the form of a bag, ~ith the exterior tube being formed from paper, preferably from multiple plies of paper. Preferably, the inner tube at the c~sto~er end is adhered at leact in a tack ~anner to the outer tube at the customer end to facilitate filling of the inner tube.
2~2826-1 Preferably one or both of the flaps is of a multiple ply construction.
Preferably the overlying flap of the base at the factory end is of a multiple ply and part of one ply of the overlying flap is adhered to the factory end ~f the inner tube while the factory end of the inner tu~e is adhesively associat~d with at least one ply of the unde_lying flap.
Preferably the container operates such that, when lying substantially horizontally, the overlying flap of the base can be lifted by a person usi~g one or two hands, the container then bein~ ~o~able t~ a condition where the ~ase is directed downwardly and the weight of the contents in the inner tube will allow the dropping free thereof from the outer tube or the lifting free of the outer tube from t~e inner tube or a combination of ~oth by breaking associations and/or adhesive associ2tions without releasing any substantial loose pieces of material fro~ the o~ter tube and~or inner tube.
The container is preferably substantially rectangulsr in form.
Preferably the outer tube is substantially as hereinafter described with reference to any one or mor2 of the ~cco~panying drawings In another aspect the invention is a container substantially as hereinafter described with reference to any one or more of the accompanying drawings other than Figures 3A, 3B and 3C.
~ n still a further aspect the in~ention consists in a method o~ forming a lie flat container ~aving a tube of a sealable plastics material (hereafter "the inner tube") disposed within an exterior tube ~hereafter "the outer tube"), each tube havinq been formed of at least one web of a planar material, the same end (hereafter "the factory end") of each ~f the inner tube and outer tube being separately closed while the other end of each of the ~128~6~
inner tube and outer tube ls open (hereafter "the customer end") to allow the filling of the inner tube prior to the sealing thereof, and wherein, in its lie flat, unfi'led condition, each tube simply lies as a simple fold connected front and bac~ panel ex~ept at the factory end where the outer tube at least has been confor~ed from factory end regions of the front and back panels of the outer tube to a substantially planar base region disposed in a lie flat cond~tion o~er one or other of the ~ront or back panels of the outer tube, said outer tube at said factory end bein~ held closed at least primarily by overlying flaps fro~ the factory end ex~re~ity cf each of the front and back panels, the flaps while adhered one to the other being capable of being peel separated so that, in use, if desired, the filled and sealed inner tube, if not permanently attached to the outer tube at the customer end, can be removed fro~ the factor~ end after the peel separation of the flaps to a low opening of the outer tube at the factory end, which method comprises the steps of:
advancing a feed of a inner tu~e and a outer tube, the inner tube being within the outer tu~e, heat sealing the factory end of the advanced inner tu~e, spreading the factory end of the advanced outer tube out together with part of the sealed ~actory end of the inner tube to define a lie flat base but from which extends in opposite directions (parallel to the locus of advancement) said flaps of the ~ase and thereafter adhesively inter-engaging said flaps, the completed lie flat container structure ~eing a discrete item after, if necessary, a cutting of the feeds o~ materi~l at the customer end.
Preferably said method involves the use of one or several plies of a paper from which the outer tube is to be formed, a tubular pla~tics material from which the inner tube is formed, ~2~2G'I`
~orming the outer tube about the inne~ tubular ~aterial, ma~ing appropriate perforations and~or cuts as ~ell as a heat ~eal to close the inner tube of the plastics material and sequentially adhesive closing the ~actory end cf the outer tube in the manner determina~le by reference to any of the accompanying drawings other than Figures 3A, 3B and 3C.
In still a further aspect the invention consists in a ~ethod of for~ing a container substantially as hereinaftar described when performed subs~antially as hereinbefore described with refe~ence to any one or ~ore of the accompanying drawings.
In a further aspect the invention is any container of the present invention when the inner tu~e has been ~illed with a ~aterial and the inner tube is sealed at the customer end and the outer tube is also sealed at the custo~er end.
The material with which the inner tube is filled is preferably a powder or liquid.
In a further aspect the invention consists in a ~ethod of handling a material capable of being poured selected ~ro~ a powder, liquid or discrete items, su~h as granules, which involves the operative u~e of a lie flat container of the present invention and/or one produced by a meth~d of the present invention and/or the opening and removal of a filled inner ~ube from the outer tube t~ereof that has been sealed at the custo~er end.
In a further aspect the invention is a ~ethod of ~andlin~ a material when perfor~ed substantially as hereinafter described with referen~e to the accompanying drawings.
~ he invcntion consists in the ~oregoinq and also envisages ~onstru~tions of which the following gives exa~ples.
2~ 2~26:i BRIEF DESCRIPTION OF THE ~RAWINGS
Fiyures lA through lE show the factory end of a preferred bag like ~ontainer in accordance with t~e present invention;
Figure lA shows a bag, aceordinq to the present invention, substantially lying fla~ presenting the base region for openin~;
Figure lB shows the bag according to Figure lA, in which the outer flap o~ the base regio~ is being pulled fiO as to separate the ~dhesively fixed o~erSlap ~rom the othe~ ~lap;
Figure lC shows the full opening of the outer flap;
Figure lD goes the next stage where the bag is about to be lifted upright:
Figure lE shows the bag ~h~n lifted upright with the inner tube full of a powder or liquid material fall free of the outer tube notwithstanding any sliqht adhesive or other tac~ing of the inner tubé to the factory end of the oute~ tube;
Figures 2A to 2c show the final folds together with adhesive regions giving rise to the base region connecte~ by gussets to the ~ront and rear panels of the outer tube as shown in Figure 2C, it not ~attering whether or no~ the base regions lies flat over what ~ight be considered a ~ront or ~ack panel;
Pigures 3A to 3C are si~ilar to those of Figures 2A to 2C
~ut are in relation to a prior art arrangement whereby there is a separate flap adhesively secu~ed to the plies of ~aterial from which the outer tube has been ~ade;
~ igurR 4 is a view of the factory end o~ the outer tube prior to its Gondition as in Pigure 2A but from the side as depicted in ~igure 2A;
~ igure 5 is a ~iew of the factory end as s~own in Figure 2C
2.1~8~l but f rom the other side;
Figure 6 is si~ilar to ~igure 4 ~ut showing the factory end ~rom the other side;
Figure ~ is a tipped over, inside ~iew of the factory end side shown in Figure 6;
Figure B is the tipped over, inside view of the factory end side shown in Figure 4, and Figures 2AA to 2CC show a slightly different em~odiment to t~e form as shown in Figures 2A to 2C, this different em~odimen~
providing for a greater glued flap overlap.
21~82~ 1 PETAI~ED D~SCRIPTION OF THE DRAWINGS
While this invention is susceptible of embodiment in ~any di~erent for~s, there is shown in the drawings and will be described herein in detail, several embodiments, with the understanding that the present disclosure is to be considered as an exempli~ication o~ the principles of the in~ention a~d is not intended to limit the invention to the embodiments illuctrated.
The preferred container as depicted in the enclosed drawings is prefera~ly formed using an adaption o~ existing continuous ~ultiple ply walled ma~ufacturing apparatus. Preferably the outer tube is formed from multiple plies of paper preferably with staggered ends developed by appropriate cutting and~or perfor~tion and any necessary separation procedures all of which are known in the art.
The present in~ention differs significantly from the prior art form of multiple ply bags with a plastic liner bag which had a separate base patch provided on the outer tube as depicted in ~igures 3A to ~C as p~eviousl~ supplied to the New Zealand Dairy Board, whioh adds complexity to manufacture and~or at least cost thereto and~or minimizes the re-~se that customers of the end product may make of the resulting bag. In this respect it should be realized that in so~e thlrd world countries the outer tube, once emptied, forms a ~aluable resource and, therefore, ~ini~iza-tion of destruction upon opening is desirable. Moreover a reduc-tion of pieces that become severed from the outer tu~e during ope~ing desirably should also ~e minimi7ed.
Preferably the opening of the outer tube and the unloading of the still sealed inner tube is b~ the sequence of steps as shown in Figures lA thro~h lE, all of which are self-explanatory.
The firs~ or factory end of the outer tube is shown in the dra~ings with the lines ~ sho~n for clarity of ~he drawings being 2128~
those cuts A also seen in Figure 4. Likewise lines B are cuts B
of Figures 4 and 6.
In the preferred form of the present invention, the outer tube has the gusset eonnection base region thereof fo~med from ~laps 1 and 2 with flap 2 o~erlying flap 1 (as can best be seen ln ~igures 2A through 2C) with the gusseted regions 3 of the lie flat base region over the front or back panel (as the case ~ay be) as in Figure 2C.
~ igure 2A shows how the ~lap 1 has its perimeter regions bounded by the cuts A sbown in Figure 4 provided with glue lines 4 while flap 2 includes a glue line 5. The glue lines 4 are not normally broken as can be seen in Figures lB thrcu~h lE prior to the use of gra~ity to assist in the re~oval of an inner tube 6 from within the outer tube ~, i.e., the tearing apart as in Figures lB and lC leaves the ~ase region in the manner su~stantially as it was prior to the move during forming from Figure 2~ and 2c. There is, ~owever, the difference in that the region 8 shown in Figure 7 has adhesive applied at positions 9 and that flap from one of the inner webs of one panel of the outer tube is adapted to be adhered a points 10 on the sealed inner tube 11 tsee ~iqure 8), the first or factory end of the inner tube being heat sealed along the heat seal line 12. Prei-erably, there is an adhesive ~ixing of the inner tube 11 to the other ply also but in an easily releasable ~anner. This adhesion is denoted by circles lOA and i5 under the inner tu~e 11 in Figure 8.
Persons skilled in the ~rt, from the drawings, will appreciate the sequential ~anner in which the multiply outer tube and the inner tube t11, 6) is ~ormed at its fixst or factory end.
The manner in which first the inner tube and then the outer tube or simultaneously the inner tube and outer tu~e are sealed, prefera~ly the inner tube with heat sealinq, at the customer end Zl282~ ~
is not relevant to an understanding of the invention but any conventional ~eans ~ight be used. The choice of an envelope grade adhesive capable of being opened as in Figures ~A to lE is preferred as an appropriate adhesive can ensure total success.
Figures 2AA th~ough ZCC are very simila~ drawings to Fisures 2A through 2C ~ut sho~ing how, with the slightly different arrangement of the staggering of the plies, a greater glued 1ap area ca~ be provided to provide a stronger adhesive overlap ~ut still be within the scope of the present invention.
The adhesives capable of beillq utili2ed in the forming of a bag in accordance with the prasent inve~tion include the following:
Liquid Adhesives Includin~: Starche~, Dextrines, Polyvinyl Alcohol, Animal, Casein;.
Latex Adhesive Including: Natural, Synthetic;
Emulsion Po~ymers ~ncluding: Polyvinyl Acetate ~omopoly-~ers, Ethylene/Vinyl Acetate Copolymers, Acrylate~Vinyl Acetate Copolymers, Polyethylene, Amorphou, Polypropylene, Polyamide; and Sol~ent sased: Po~yurethanes, Natural Poly~er, Synthetic Polymers, T~o Pot Systems.
~ he use of a container of the present invention provides some, i~ not all, of the advantages previously referred to.
The construction of the container of the present invention is such that when a filled contain~r is lying s~bstantially horizontally, the overlying flap of the base can be lifted by a person using ome or two hands, the contAiner then being movable to a condition where the ~ase is directed downwardly and the weight of the contents in the inner tube will allow the dropping free thereof from the outer tube or t~e lifting free of the outer tube from the inner tube or combination of both by brea~ing associations and~or adhesive associations without releasing any substantial loose pieces of ~aterial from the outer tube and~or 2l282g~-inner tube. This presumes that the second or customer ends o~
the inner and outer tubes have not been unreleaseably a~fixed to one another after ~illing, by the customer. Ideally, sep~rate sealing of the inner tube at the ~econd end, such as by he~t sealing, followed by separate sealing of the outer tube at ~he second end, would facilitate removal of the filled inner tube in the ~nanner described hereinabove.
The present invention also comprises a method of handling a liquid or granular material, or discrete items, using a container such as described.
The foregoing description and dra~ings merely explain and illustrate the invention and the in~ention is not limited thereto except insofar a5 the appended claims are so limited, as those skilled in the art who have the disclosure before them will be a~le to ~ake modifications and variations therein without departing from the scope of the invention.
Preferably the overlying flap of the base at the factory end is of a multiple ply and part of one ply of the overlying flap is adhered to the factory end ~f the inner tube while the factory end of the inner tu~e is adhesively associat~d with at least one ply of the unde_lying flap.
Preferably the container operates such that, when lying substantially horizontally, the overlying flap of the base can be lifted by a person usi~g one or two hands, the container then bein~ ~o~able t~ a condition where the ~ase is directed downwardly and the weight of the contents in the inner tube will allow the dropping free thereof from the outer tube or the lifting free of the outer tube from t~e inner tube or a combination of ~oth by breaking associations and/or adhesive associ2tions without releasing any substantial loose pieces of material fro~ the o~ter tube and~or inner tube.
The container is preferably substantially rectangulsr in form.
Preferably the outer tube is substantially as hereinafter described with reference to any one or mor2 of the ~cco~panying drawings In another aspect the invention is a container substantially as hereinafter described with reference to any one or more of the accompanying drawings other than Figures 3A, 3B and 3C.
~ n still a further aspect the in~ention consists in a method o~ forming a lie flat container ~aving a tube of a sealable plastics material (hereafter "the inner tube") disposed within an exterior tube ~hereafter "the outer tube"), each tube havinq been formed of at least one web of a planar material, the same end (hereafter "the factory end") of each ~f the inner tube and outer tube being separately closed while the other end of each of the ~128~6~
inner tube and outer tube ls open (hereafter "the customer end") to allow the filling of the inner tube prior to the sealing thereof, and wherein, in its lie flat, unfi'led condition, each tube simply lies as a simple fold connected front and bac~ panel ex~ept at the factory end where the outer tube at least has been confor~ed from factory end regions of the front and back panels of the outer tube to a substantially planar base region disposed in a lie flat cond~tion o~er one or other of the ~ront or back panels of the outer tube, said outer tube at said factory end bein~ held closed at least primarily by overlying flaps fro~ the factory end ex~re~ity cf each of the front and back panels, the flaps while adhered one to the other being capable of being peel separated so that, in use, if desired, the filled and sealed inner tube, if not permanently attached to the outer tube at the customer end, can be removed fro~ the factor~ end after the peel separation of the flaps to a low opening of the outer tube at the factory end, which method comprises the steps of:
advancing a feed of a inner tu~e and a outer tube, the inner tube being within the outer tu~e, heat sealing the factory end of the advanced inner tu~e, spreading the factory end of the advanced outer tube out together with part of the sealed ~actory end of the inner tube to define a lie flat base but from which extends in opposite directions (parallel to the locus of advancement) said flaps of the ~ase and thereafter adhesively inter-engaging said flaps, the completed lie flat container structure ~eing a discrete item after, if necessary, a cutting of the feeds o~ materi~l at the customer end.
Preferably said method involves the use of one or several plies of a paper from which the outer tube is to be formed, a tubular pla~tics material from which the inner tube is formed, ~2~2G'I`
~orming the outer tube about the inne~ tubular ~aterial, ma~ing appropriate perforations and~or cuts as ~ell as a heat ~eal to close the inner tube of the plastics material and sequentially adhesive closing the ~actory end cf the outer tube in the manner determina~le by reference to any of the accompanying drawings other than Figures 3A, 3B and 3C.
In still a further aspect the invention consists in a ~ethod of for~ing a container substantially as hereinaftar described when performed subs~antially as hereinbefore described with refe~ence to any one or ~ore of the accompanying drawings.
In a further aspect the invention is any container of the present invention when the inner tu~e has been ~illed with a ~aterial and the inner tube is sealed at the customer end and the outer tube is also sealed at the custo~er end.
The material with which the inner tube is filled is preferably a powder or liquid.
In a further aspect the invention consists in a ~ethod of handling a material capable of being poured selected ~ro~ a powder, liquid or discrete items, su~h as granules, which involves the operative u~e of a lie flat container of the present invention and/or one produced by a meth~d of the present invention and/or the opening and removal of a filled inner ~ube from the outer tube t~ereof that has been sealed at the custo~er end.
In a further aspect the invention is a ~ethod of ~andlin~ a material when perfor~ed substantially as hereinafter described with referen~e to the accompanying drawings.
~ he invcntion consists in the ~oregoinq and also envisages ~onstru~tions of which the following gives exa~ples.
2~ 2~26:i BRIEF DESCRIPTION OF THE ~RAWINGS
Fiyures lA through lE show the factory end of a preferred bag like ~ontainer in accordance with t~e present invention;
Figure lA shows a bag, aceordinq to the present invention, substantially lying fla~ presenting the base region for openin~;
Figure lB shows the bag according to Figure lA, in which the outer flap o~ the base regio~ is being pulled fiO as to separate the ~dhesively fixed o~erSlap ~rom the othe~ ~lap;
Figure lC shows the full opening of the outer flap;
Figure lD goes the next stage where the bag is about to be lifted upright:
Figure lE shows the bag ~h~n lifted upright with the inner tube full of a powder or liquid material fall free of the outer tube notwithstanding any sliqht adhesive or other tac~ing of the inner tubé to the factory end of the oute~ tube;
Figures 2A to 2c show the final folds together with adhesive regions giving rise to the base region connecte~ by gussets to the ~ront and rear panels of the outer tube as shown in Figure 2C, it not ~attering whether or no~ the base regions lies flat over what ~ight be considered a ~ront or ~ack panel;
Pigures 3A to 3C are si~ilar to those of Figures 2A to 2C
~ut are in relation to a prior art arrangement whereby there is a separate flap adhesively secu~ed to the plies of ~aterial from which the outer tube has been ~ade;
~ igurR 4 is a view of the factory end o~ the outer tube prior to its Gondition as in Pigure 2A but from the side as depicted in ~igure 2A;
~ igure 5 is a ~iew of the factory end as s~own in Figure 2C
2.1~8~l but f rom the other side;
Figure 6 is si~ilar to ~igure 4 ~ut showing the factory end ~rom the other side;
Figure ~ is a tipped over, inside ~iew of the factory end side shown in Figure 6;
Figure B is the tipped over, inside view of the factory end side shown in Figure 4, and Figures 2AA to 2CC show a slightly different em~odiment to t~e form as shown in Figures 2A to 2C, this different em~odimen~
providing for a greater glued flap overlap.
21~82~ 1 PETAI~ED D~SCRIPTION OF THE DRAWINGS
While this invention is susceptible of embodiment in ~any di~erent for~s, there is shown in the drawings and will be described herein in detail, several embodiments, with the understanding that the present disclosure is to be considered as an exempli~ication o~ the principles of the in~ention a~d is not intended to limit the invention to the embodiments illuctrated.
The preferred container as depicted in the enclosed drawings is prefera~ly formed using an adaption o~ existing continuous ~ultiple ply walled ma~ufacturing apparatus. Preferably the outer tube is formed from multiple plies of paper preferably with staggered ends developed by appropriate cutting and~or perfor~tion and any necessary separation procedures all of which are known in the art.
The present in~ention differs significantly from the prior art form of multiple ply bags with a plastic liner bag which had a separate base patch provided on the outer tube as depicted in ~igures 3A to ~C as p~eviousl~ supplied to the New Zealand Dairy Board, whioh adds complexity to manufacture and~or at least cost thereto and~or minimizes the re-~se that customers of the end product may make of the resulting bag. In this respect it should be realized that in so~e thlrd world countries the outer tube, once emptied, forms a ~aluable resource and, therefore, ~ini~iza-tion of destruction upon opening is desirable. Moreover a reduc-tion of pieces that become severed from the outer tu~e during ope~ing desirably should also ~e minimi7ed.
Preferably the opening of the outer tube and the unloading of the still sealed inner tube is b~ the sequence of steps as shown in Figures lA thro~h lE, all of which are self-explanatory.
The firs~ or factory end of the outer tube is shown in the dra~ings with the lines ~ sho~n for clarity of ~he drawings being 2128~
those cuts A also seen in Figure 4. Likewise lines B are cuts B
of Figures 4 and 6.
In the preferred form of the present invention, the outer tube has the gusset eonnection base region thereof fo~med from ~laps 1 and 2 with flap 2 o~erlying flap 1 (as can best be seen ln ~igures 2A through 2C) with the gusseted regions 3 of the lie flat base region over the front or back panel (as the case ~ay be) as in Figure 2C.
~ igure 2A shows how the ~lap 1 has its perimeter regions bounded by the cuts A sbown in Figure 4 provided with glue lines 4 while flap 2 includes a glue line 5. The glue lines 4 are not normally broken as can be seen in Figures lB thrcu~h lE prior to the use of gra~ity to assist in the re~oval of an inner tube 6 from within the outer tube ~, i.e., the tearing apart as in Figures lB and lC leaves the ~ase region in the manner su~stantially as it was prior to the move during forming from Figure 2~ and 2c. There is, ~owever, the difference in that the region 8 shown in Figure 7 has adhesive applied at positions 9 and that flap from one of the inner webs of one panel of the outer tube is adapted to be adhered a points 10 on the sealed inner tube 11 tsee ~iqure 8), the first or factory end of the inner tube being heat sealed along the heat seal line 12. Prei-erably, there is an adhesive ~ixing of the inner tube 11 to the other ply also but in an easily releasable ~anner. This adhesion is denoted by circles lOA and i5 under the inner tu~e 11 in Figure 8.
Persons skilled in the ~rt, from the drawings, will appreciate the sequential ~anner in which the multiply outer tube and the inner tube t11, 6) is ~ormed at its fixst or factory end.
The manner in which first the inner tube and then the outer tube or simultaneously the inner tube and outer tu~e are sealed, prefera~ly the inner tube with heat sealinq, at the customer end Zl282~ ~
is not relevant to an understanding of the invention but any conventional ~eans ~ight be used. The choice of an envelope grade adhesive capable of being opened as in Figures ~A to lE is preferred as an appropriate adhesive can ensure total success.
Figures 2AA th~ough ZCC are very simila~ drawings to Fisures 2A through 2C ~ut sho~ing how, with the slightly different arrangement of the staggering of the plies, a greater glued 1ap area ca~ be provided to provide a stronger adhesive overlap ~ut still be within the scope of the present invention.
The adhesives capable of beillq utili2ed in the forming of a bag in accordance with the prasent inve~tion include the following:
Liquid Adhesives Includin~: Starche~, Dextrines, Polyvinyl Alcohol, Animal, Casein;.
Latex Adhesive Including: Natural, Synthetic;
Emulsion Po~ymers ~ncluding: Polyvinyl Acetate ~omopoly-~ers, Ethylene/Vinyl Acetate Copolymers, Acrylate~Vinyl Acetate Copolymers, Polyethylene, Amorphou, Polypropylene, Polyamide; and Sol~ent sased: Po~yurethanes, Natural Poly~er, Synthetic Polymers, T~o Pot Systems.
~ he use of a container of the present invention provides some, i~ not all, of the advantages previously referred to.
The construction of the container of the present invention is such that when a filled contain~r is lying s~bstantially horizontally, the overlying flap of the base can be lifted by a person using ome or two hands, the contAiner then being movable to a condition where the ~ase is directed downwardly and the weight of the contents in the inner tube will allow the dropping free thereof from the outer tube or t~e lifting free of the outer tube from the inner tube or combination of both by brea~ing associations and~or adhesive associations without releasing any substantial loose pieces of ~aterial from the outer tube and~or 2l282g~-inner tube. This presumes that the second or customer ends o~
the inner and outer tubes have not been unreleaseably a~fixed to one another after ~illing, by the customer. Ideally, sep~rate sealing of the inner tube at the ~econd end, such as by he~t sealing, followed by separate sealing of the outer tube at ~he second end, would facilitate removal of the filled inner tube in the ~nanner described hereinabove.
The present invention also comprises a method of handling a liquid or granular material, or discrete items, using a container such as described.
The foregoing description and dra~ings merely explain and illustrate the invention and the in~ention is not limited thereto except insofar a5 the appended claims are so limited, as those skilled in the art who have the disclosure before them will be a~le to ~ake modifications and variations therein without departing from the scope of the invention.
Claims
WHAT IS CLAIMED IS:
A lie flat container comprising:
an inner tube of a sealable plastics material, said inner tube having a first end, a second end, a front panel and a back panel;
an outer tube, having a first end, a second end, a front panel and a back panel;
said first end of said inner tube being disposed adjacent said first end of said outer tube;
said inner tube being disposed within said outer tube, each of said inner and outer tubes having been formed of at least one web of a planar material;
said first and of said inner tube and said first end of said outer tube being closed separately from one another, said second end of said inner tube and said second end of said outer tube being open so as to enable the filling of said inner tube prior to sealing thereof;
each of said first and second tubes being operably config-ured so as to lie substantially flat, when in an unfilled condi-tion, such that said front panels and said back panels lie in substantially flat overlying relation to one another, respectively;
flap members operably formed in at least said first end of said outer tube, said flap members being operably configured to be arranged such that one flap member is in overlying relationship to the other, underlying flap member, to form a substantially planar base region operably configured so as to fold over onto one of said front and back panels of said outer tube, when said container is in an unfilled condition;
said flap members being releasably affixed to one another so as to enable separation of said flap members to enable opening of said first end of said outer tube, to further enable access to said inner tube.
The container according to claim 1, wherein said container is in the form of a bag.
The container according to claim 1, wherein said inner and outer tubes thereof are formed by extrusion.
The container according to claim 1, wherein said inner and outer tubes thereof are formed by fabrication.
The container according to claim 1, wherein said outer tube is formed from paper.
The container according to claim 5, wherein said outer tube is formed from multiple plies of paper.
The container according to claim 1, wherein said second end of said inner tube is adhered to said second end of said outer tube to facilitate filling of said inner tube.
The container according to claim 1, wherein at least one of the flap members is fabricated of multiple plies of material.
The container according to claim 1, wherein at least one ply of said underlying flap member is adhesively associated with said first end of said inner tube, said overlying flap member at said first end being formed of multiple plies and a portion of one of said multiple plies being adhered to said first end of said inner tube.
The container accordingly to claim 1, wherein said container has a substantially rectangular cross-section when said inner tube is filled.
A method of forming a container comprising the steps of:
advancing a feed of a substantially flexible inner tube and a substantially flexible outer tube, the inner tube being disposed within the outer tube, heat sealing a first end of the advanced inner tube, spreading the first end of the advanced outer tube out together with part of the sealed first end of the inner tube to define a lie flat base;
forming flap members in said first end of said outer tube, said flap members extending in opposite directions from said base, and parallel to the direction of advancement of said inner and outer tubes; and thereafter adhesively inter-engaging said flap members, beyond the sealed end of the inner tube, in such a manner that the flap members may thereafter be peel-opened so as to permit access to the inner tube without substantially damaging the outer tube, said inter-engaging of said flap members of said outer tube occurring without interlocking affixation of the first end of said inner tube to the first end of said outer tube.
The method according to claim 11, further comprising the step of:
cutting the feeds of material at respective second ends of said inner and outer tubes, to form a discrete flat container structure.
The method according to claim 11, further comprising the step of:
forming the inner tube from a plastics material.
The method according to claim 11, further comprising the step of:
forming the outer tube from one or more plies of paper material.
The method according to claim 11, further comprising the steps of:
filling said inner tube;
sealing said second end of said inner tube;
sealing said second end of said outer tube.
The method according to claim 15, wherein said step of filling said inner tube further comprises filling said inner tube with one of the following materials: a powder, a liquid.
A lie flat container comprising:
an inner tube of a sealable plastics material, said inner tube having a first end, a second end, a front panel and a back panel;
an outer tube, having a first end, a second end, a front panel and a back panel;
said first end of said inner tube being disposed adjacent said first end of said outer tube;
said inner tube being disposed within said outer tube, each of said inner and outer tubes having been formed of at least one web of a planar material;
said first and of said inner tube and said first end of said outer tube being closed separately from one another, said second end of said inner tube and said second end of said outer tube being open so as to enable the filling of said inner tube prior to sealing thereof;
each of said first and second tubes being operably config-ured so as to lie substantially flat, when in an unfilled condi-tion, such that said front panels and said back panels lie in substantially flat overlying relation to one another, respectively;
flap members operably formed in at least said first end of said outer tube, said flap members being operably configured to be arranged such that one flap member is in overlying relationship to the other, underlying flap member, to form a substantially planar base region operably configured so as to fold over onto one of said front and back panels of said outer tube, when said container is in an unfilled condition;
said flap members being releasably affixed to one another so as to enable separation of said flap members to enable opening of said first end of said outer tube, to further enable access to said inner tube.
The container according to claim 1, wherein said container is in the form of a bag.
The container according to claim 1, wherein said inner and outer tubes thereof are formed by extrusion.
The container according to claim 1, wherein said inner and outer tubes thereof are formed by fabrication.
The container according to claim 1, wherein said outer tube is formed from paper.
The container according to claim 5, wherein said outer tube is formed from multiple plies of paper.
The container according to claim 1, wherein said second end of said inner tube is adhered to said second end of said outer tube to facilitate filling of said inner tube.
The container according to claim 1, wherein at least one of the flap members is fabricated of multiple plies of material.
The container according to claim 1, wherein at least one ply of said underlying flap member is adhesively associated with said first end of said inner tube, said overlying flap member at said first end being formed of multiple plies and a portion of one of said multiple plies being adhered to said first end of said inner tube.
The container accordingly to claim 1, wherein said container has a substantially rectangular cross-section when said inner tube is filled.
A method of forming a container comprising the steps of:
advancing a feed of a substantially flexible inner tube and a substantially flexible outer tube, the inner tube being disposed within the outer tube, heat sealing a first end of the advanced inner tube, spreading the first end of the advanced outer tube out together with part of the sealed first end of the inner tube to define a lie flat base;
forming flap members in said first end of said outer tube, said flap members extending in opposite directions from said base, and parallel to the direction of advancement of said inner and outer tubes; and thereafter adhesively inter-engaging said flap members, beyond the sealed end of the inner tube, in such a manner that the flap members may thereafter be peel-opened so as to permit access to the inner tube without substantially damaging the outer tube, said inter-engaging of said flap members of said outer tube occurring without interlocking affixation of the first end of said inner tube to the first end of said outer tube.
The method according to claim 11, further comprising the step of:
cutting the feeds of material at respective second ends of said inner and outer tubes, to form a discrete flat container structure.
The method according to claim 11, further comprising the step of:
forming the inner tube from a plastics material.
The method according to claim 11, further comprising the step of:
forming the outer tube from one or more plies of paper material.
The method according to claim 11, further comprising the steps of:
filling said inner tube;
sealing said second end of said inner tube;
sealing said second end of said outer tube.
The method according to claim 15, wherein said step of filling said inner tube further comprises filling said inner tube with one of the following materials: a powder, a liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2128261 CA2128261C (en) | 1994-07-18 | 1994-07-18 | Multiwall bag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2128261 CA2128261C (en) | 1994-07-18 | 1994-07-18 | Multiwall bag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2128261A1 CA2128261A1 (en) | 1996-01-19 |
| CA2128261C true CA2128261C (en) | 2002-09-17 |
Family
ID=4154025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2128261 Expired - Lifetime CA2128261C (en) | 1994-07-18 | 1994-07-18 | Multiwall bag |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2128261C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2280760C (en) | 1997-02-17 | 2007-07-03 | H A Holmes & Co. Limited | Bag-in-bag packaging system |
-
1994
- 1994-07-18 CA CA 2128261 patent/CA2128261C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2128261A1 (en) | 1996-01-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20140718 |