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WO2006097104A2 - Sac a couture de connexion formant des courbes renforcees - Google Patents

Sac a couture de connexion formant des courbes renforcees Download PDF

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Publication number
WO2006097104A2
WO2006097104A2 PCT/DK2006/000146 DK2006000146W WO2006097104A2 WO 2006097104 A2 WO2006097104 A2 WO 2006097104A2 DK 2006000146 W DK2006000146 W DK 2006000146W WO 2006097104 A2 WO2006097104 A2 WO 2006097104A2
Authority
WO
WIPO (PCT)
Prior art keywords
curve
reinforcing
bag
bag according
flaps
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DK2006/000146
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English (en)
Other versions
WO2006097104A3 (fr
Inventor
Johan Philip Trampe
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 WO2006097104A2 publication Critical patent/WO2006097104A2/fr
Publication of WO2006097104A3 publication Critical patent/WO2006097104A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/02—Local reinforcements or stiffening inserts, e.g. wires, strings, strips or frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/06—Handles
    • B65D33/08—Hand holes
    • 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
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/28—Strings or strip-like closures, i.e. draw closures

Definitions

  • the present invention relates generally to a bag having reinforcing flaps at an upper part of the bag, and more specifically to a bag wherein the reinforcing flaps are connected to the sides of the bag by one or more connection or welding seams.
  • the invention further relates to a bag for containing a gas or a liquid.
  • the invention also relates to a bag having two handles formed by use of one or more connection seams forming one or more reinforcing curves.
  • the invention relates to a method for heat sealing a multiple layer of thermoplastic film.
  • EP 1 252 073 B1 a bag or carrier bag having two folded reinforcing parts, with each reinforcing part forming a channel and being connected to a side piece of the bag by a welding seam.
  • the bag has a seize opening in each of the reinforcing parts, and in a second embodiment the bag has a loop handle being connected to each of the reinforcing parts.
  • a draw band is provided in each channel formed by the reinforcing part.
  • Each reinforcing part is welded to a side part of the bag by a continuously welding seam forming a straight line and extending substantially from the first to the second side edges of the bag.
  • the weakest areas are along the connections of the reinforcing parts to the side pieces, which connections are provided by the welding seams underneath the seize openings or loop handles.
  • a bag which overcomes the above- mentioned drawbacks, and allows an improved connection or welding of the reinforcing parts to the side pieces.
  • an improved bag for containing a gas or a liquid It is also an object of invention to provide an improved bag with two handles formed by use of an improved connection of the side pieces of the bag. It is furthermore an object of the invention to provide an improved method for heat sealing a multiple layer of thermoplastic film.
  • a bag comprising two opposing side pieces, a first and a second side piece, said side pieces being interconnected at each side edge of the bag and at a bottom thereof, said bag further comprising two reinforcing pieces, a first and a second reinforcing piece, said first and second reinforcing pieces being connected to the first and second side pieces, respectively, at an upper part of the bag, thereby forming first and second reinforcing flaps with each flap having one or more connection seams, wherein the connection seam(s) of each flap forms/form at least one reinforcing curve, and wherein, for at least one reinforcing curve of one or both flaps, the total length of the connection seam(s) forming a reinforcing curve is longer than the shortest distance between the two outermost points of the formed reinforcing curve.
  • the total length of the connection seam(s) forming a reinforcing curve is longer than the shortest distance between the two outermost points of the formed reinforcing curve.
  • the reinforcing pieces are formed at the upper end of the bag by having each of the side pieces being bent downwards and connected to the side piece by one or more connection seams, thereby forming the first and the second reinforcing flaps.
  • At least one reinforcing curve of one or both flaps has at least one curve part with a positive slope and/or at least one curve part with a negative slope.
  • one, two, three, four or more reinforcing curves of one or both flaps has one, two, three, four or more curve parts with a positive slope and/or one, two, three, four or more curve parts with a negative slope.
  • the slopes may be defined in relation to a line extending in a transverse direction of the bag from one side edge to the other.
  • the general direction of a reinforcing curve extends substantially in a transverse direction of the bag.
  • the bag of the first aspect of the present invention also covers embodiments wherein at least one reinforcing curve of one or both flaps forms at least one peak and/or at least one trough. It is preferred that at least one reinforcing curve of one or both flaps forms several peaks and/or troughs. It is also preferred that at least one reinforcing curve of one or both flaps forms at least 2 or 3 peaks and/or 2 or 3 troughs.
  • At least one reinforcing curve of one or both flaps forms a curve with alternating peaks and troughs.
  • the peak(s) and/or trough(s) is/are defined in relation to a line extending in a transverse direction of the bag from one side edge to the other.
  • the total length of the connection seam(s) forming a reinforcing curve is longer than or equal to 1,2 or 1 ,3 times the shortest distance between the two outermost points of the formed reinforcing curve. It is further preferred that for several or all reinforcing curves, the total length of the connection seam(s) forming a reinforcing curve is longer than or equal to 1 ,2 or 1 ,3 times the shortest distance between the two outermost points of the formed reinforcing curve.
  • the total length of the connection seam(s) forming a reinforcing curve is longer than or equal to 1 ,4 or 1 ,5 times the shortest distance between the two outermost points of the formed reinforcing curve. It is further preferred that for several or all reinforcing curves, the total length of the connection seam(s) forming a reinforcing curve is longer than or equal to 1 ,4 or 1 ,5 times the shortest distance between the two outermost points of the formed reinforcing curve.
  • a reinforcing curve of the bag of the first aspect of the invention may take on a lot of different forms.
  • at least one reinforcing curve of one or both flaps forms a substantially sinusoidal formed curve or an arched formed curve. It is also within an embodiment of the bag of the invention that at least one reinforcing curve of one or both flaps has one or more angled parts or one or more pyramid shaped parts.
  • the bag of the first aspect of the invention covers embodiments wherein at least one reinforcing curve of one or both flaps is formed of several separated connection seams.
  • the bag of the invention also covers embodiments wherein at least one reinforcing curve of one or both flaps is formed of a single connection seam.
  • one or both reinforcing flaps are connected to the corresponding side piece along at least 1/5, 1/4, 1/3, 1/2 or 2/3 of the total length from one side edge of the bag to the other.
  • the bag of the first aspect of the present invention also covers embodiments in which a channel is formed in each reinforcing flap. It is preferred that each channel is formed by the connection of a bent downwards part to the side piece. It is also preferred that at least one draw band is provided in each channel.
  • the bag of the first aspect of the invention also covers embodiments wherein the bag further is provided with a carrying handle at each reinforcing flap.
  • the carrying handle may be a seize opening provided through the flap and arranged above the at least one reinforcing curve. It is preferred that for each flap, the carrying handle is arranged underneath the draw band and above the at least one reinforcing curve.
  • the carrying handle is a seize opening, the two side faces of a channel may be connected at a point between the draw band and the seize opening.
  • a first reinforcing curve is provided underneath a first end section of the carrying handle and a second reinforcing curve is provided underneath the other end section of the carrying handle.
  • a first reinforcing curve is extending underneath the carrying handle at least from the first end section of the carrying handle to the other end section of the carrying handle.
  • the carrying handle is a loop handle connected at first and second ends thereof to the flap above the at least one reinforcing curve.
  • the carrying handle may be connected to the flap underneath the draw band and above the at least one reinforcing curve.
  • a first reinforcing curve is provided underneath the first end of the carrying handle and a second reinforcing curve is provided underneath the second end of the carrying handle.
  • a first reinforcing curve is extending underneath the carrying handle at least from the first end of the carrying handle to the other end of the carrying handle.
  • each channel is provided with an opening at one or both side edges of the bag, said draw band extending out of at least one of said openings.
  • the channels may be provided with an opening at one and the same side edge of the bag only, and the draw band may be fastened to the other side edge of the bag.
  • the ends of the draw band(s) that extend out of the openings are not interconnected.
  • the ends of the draw band(s) that extend out of the openings are interconnected.
  • the interconnection may be in a tearable manner.
  • the bag of the first aspect of the present invention may be made from different materials, but in a preferred embodiment the bag is made from a plastic material.
  • the draw band(s) and the loop handle(s) may also be made from a plastic material.
  • the plastic material may be polyethylene (PE) or polypropylene (PP).
  • PE polyethylene
  • PP polypropylene
  • the draw band(s) is formed as a string made of cotton other any suitable material for forming such a string.
  • connection curve(s) of each flap is made by welding or formed by heat sealing. It is also within an embodiment that all connections in the bag are made by welding or by heat sealing.
  • the bag of the present first aspect of the present invention also covers embodiments wherein the connection curve(s) of each flap is made by gluing or by application of adhesive. It is also within an embodiment that all connections in the bag are made by gluing or by application of adhesive.
  • a bag for containing a gas or a liquid comprising: at least a first and a second side piece, and a mouthpiece or sleeve arranged at the first side piece of the bag, said mouthpiece or sleeve being connected to the first side piece by use of a sleeve weld curve, said sleeve weld curve having at least one peak and/or trough.
  • the sleeve weld curve may form several peaks and/or troughs.
  • the sleeve weld curve may also form a substantially sinusoidal formed curve or an arched formed curve.
  • first and second side pieces are connected to each other along side edges by one or more continuously formed sealing curves.
  • a sealing curve may run along each of the connecting side edges.
  • the bag has more than two side pieces being connected to each other along side edges, and wherein a sealing curve runs along each of the connecting side edges.
  • the side pieces of the bag of the second aspect of the invention may be substantially rectangular shaped.
  • the sleeve and/or side pieces are made from a weldable material.
  • the sleeve and/or side pieces may be made from a plastic material.
  • the plastic material may be polyethylene (PE) or polypropylene (PP). Materials such as EVOH or Nylon or metallized polyester and laminates thereof may also be used for the side pieces and/or sleeve of the bag.
  • the sealing curves are made by welding or by heat sealing.
  • the bag of the second aspect of the invention also covers embodiments wherein the sealing curves are made by gluing or by application of adhesive.
  • a bag according to one or more embodiments of the second aspect of the invention may be formed so as to be used as a bag in a bag-in- box, as a pouch, as a colostomy bag, as a bag for containing blood or as other types of bags where reinforced sealing of side pieces may be needed.
  • a bag having at least two opposing bag side pieces and comprising: a bottom end with a bottom weld or seam extending at least partly between a first side part and a second opposed side part, and first and second handles being formed at an upper part of said first and second side parts, respectively, opposed to the bottom end with a bag opening being formed between said two handles, a first opening being formed at the upper part of the first side part to thereby form an opening of the first handle with one or more first connection seams extending above said first opening thereby connecting a first upper part of said bag side pieces, a second opening being formed at the upper part of the second side part to thereby form an opening of the second handle with one or more second connection seams extending above said second opening thereby connecting a second upper part of said bag side pieces, wherein the connection seam(s) of each handle forms at least one reinforcing curve, and wherein, for at least one reinforcing curve of one or both handles, the total length of the connection seam(s) forming
  • the bottom weld or seam is provided by a continuous connection or welding seam extending between the first and second opposed side parts to thereby obtain a closed bottom end.
  • the bottom weld or seam is provided by a continuous connection or welding seam forming a reinforcing curve.
  • first and second side parts have first and second side edges, respectively, with a first lateral gusset extending inwards from said first side edge and with a second lateral gusset extending inwards from said second side edge, said first opening of the first handle being provided in the upper part of the first lateral gusset, and said second opening being provided in the upper part of the second lateral gusset, whereby the first and second handles are both formed of parts of double layered bag side pieces.
  • At least one reinforcing curve of one or both handles and/or the bottom weld has at least one curve part with a positive slope and/or at least one curve part with a negative slope.
  • the slopes may be defined in relation to a line extending in a transverse direction of the bag from one side edge of the handle to the other.
  • the general direction of a reinforcing curve extends substantially in a transverse direction of the bag.
  • At least one reinforcing curve of one or both handles and/or the bottom weld forms at least one peak and/or at least one trough. It is further preferred that at least one reinforcing curve of one or both handles and/or the bottom weld forms several peaks and/or troughs.
  • at least one reinforcing curve may form at least 2 or 3 peaks and/or 2 or 3 troughs.
  • the total length of the connection seam(s) forming a reinforcing curve is longer than or equal to 1 ,2, 1,3, 1,4 or 1 ,5 times the shortest distance between the two outermost points of the formed reinforcing curve.
  • At least one reinforcing curve of one or both handles and/or the bottom weld forms a curve with alternating peaks and troughs.
  • at least one reinforcing curve may form a substantially sinusoidal formed curve or an arched formed curve.
  • the third aspect of the invention also covers a bag, wherein at least one reinforcing curve of one or both handles and/or the bottom weld has one or more angled parts or one or more pyramid shaped parts.
  • At least one reinforcing curve of one or both handles is formed of several separated connection seams.
  • at least one reinforcing curve of one or both handles is formed of a single connection seam.
  • opposed parts of bag side pieces of each handle are connected along at least 1/2 or 2/3 of the total length from one side edge of the handle to the other.
  • the side pieces are connected along the whole length from one side edge of the handle to the other.
  • the bag side pieces are made from a weldable material.
  • the bag side pieces may be made from a plastic material.
  • the plastic material may be polyethylene (PE) or polypropylene (PP). Materials such as EVOH or Nylon or metallized polyester and laminates thereof may also be used for the side pieces of the bag.
  • connection seams or reinforcing curves are made by welding or by heat sealing.
  • the bottom weld of the bag may also be made by welding or by heat sealing.
  • the bag of the third aspect of the invention also covers embodiments wherein the connection seams are made by gluing or by application of adhesive.
  • a method of heat-sealing in the longitudinally direction a continuously moving multiple layer web of thermoplastic film comprising the steps of: providing a cylindrical drum mounted for rotation about the axis thereof, providing a continuously heated area in the cylindrical surface of the drum, said heated area forming a curve extending in a direction around the cylindrical surface of the drum to thereby at least partly encircling the drum, wrapping the moving web of film around the cylindrical surface of the drum, providing a tension of the web film against the cylindrical surface of the drum, rotating the cylindrical surface of the drum together with moving web or film, and maintaining the tension of the web film against the cylindrical surface of the drum during the substantial portion of the rotation thereof to thereby heat seal part of the multiple layer web film along the heated area of the drum surface.
  • the method of the present invention further comprises providing a flow of hot air to at least part of the area of the web film covering the heated area of the cylindrical surface of the drum during the substantial portion of the rotatio ⁇ thereof during which said heat sealing is performed.
  • a flow of hot air may be provided to preheat the part of the moving web film, which is to cover the heated area of the surface of the drum, said preheating being performed before the moving web film part reaches the surface of the drum.
  • the temperature of the heated area of the cylindrical surface is maintained high enough to perform said heat sealing of the web film during the rotation of the cylindrical surface. It is also preferred that the temperature of the hot air flow is controlled so that the temperature of the hot air reaching the web film is maintained below the heat sealing temperature of the web film.
  • the curve formed by the heated area of the cylindrical surface may fully encircle the drum. It is within a preferred embodiment that the heated area of the cylindrical surface forms a curve with alternating peaks and troughs. The total length of the curve formed by the heated area of the cylindrical surface is preferably longer than or equal to 1 ,2 or 1 ,3 times the circumference of the cylindrical surface. It is also within an embodiment of the method of the invention that the heated area of the cylindrical surface forms a substantially sinusoidal formed curve or an arched formed curve.
  • the web film may be made of polyethylene, which may have a welding temperature of about 130 "C, and the temperature of the heated area of the cylindrical surface may be maintained above 130 °C, such as around 135 ° C, during the heat-sealing rotation of the cylindrical surface.
  • the temperature of the hot air reaching the web film is maintained around or below 120 ° C during the heat-sealing rotation of the cylindrical surface.
  • other film materials may be heat sealed according to an embodiment of the method of the invention, which film materials may have another welding temperature and thereby demand another temperature of the heated area and another temperature of the hot air. It should be understood that principles covered by the method of the invention may be used as part of the manufacturing of the bags according to embodiments of the first and/or third aspects of the invention.
  • Figs. 1a, 1b and 1c illustrate various embodiments of a bag according to the first aspect of the invention provided with a loop-handle, partly broken and in side view,
  • Figs. 2a, 2b and 2c illustrate various embodiments of a bag according to the first aspect oft the invention provided with an integrated handle, partly broken and in side view,
  • Figs. 3a, 3b and 3c illustrate various embodiments of a bag according to the first aspect of the invention having channels with draw band, partly broken and in side view,
  • Figs. 4a and 4b illustrate further embodiments of a bag according to the first aspect of the invention having channels with draw band, partly broken and in side view,
  • Fig. 5 shows an embodiment of a bag according to the first aspect of the invention having channels with draw band and a loop-handle, partly broken and in side view,
  • Figs. 6a, 6b, 6c, 6d, 6e, 6f and 6g illustrate various embodiments of reinforcing curves according to the invention
  • Figs. 7a and 7b show a top view and a side view of an embodiment of a bag according to the second aspect of the invention
  • Figs. 8a and 8b illustrate two embodiments of a bag according to the third aspect of the invention provided with two handles
  • Figs. 9a and 9b illustrates two embodiments of an apparatus for heat-sealing a multiple layer of thermoplastic film according to the method of the present invention.
  • a bag 1 or carrier bag according to the embodiments illustrated in Figs. 1-5 comprises two side pieces 2a, 2b and may be manufactured from a sheet material, which is preferably a plastic material, such as polyethylene (PE).
  • PE polyethylene
  • the bag may be manufactured from two sheets positioned on top of each other and welded together at bottom 3 of the bag 1 and at the side edges 4a, 4b of the bag 1 , or it may be manufactured from one sheet that is bent at the bottom 3 of the bag 1 and welded at the side edges 4a, 4b of the bag 1.
  • the bottom 3 may also be gusseted.
  • the reinforcing pieces may have a shorter length than the side pieces 2a, 2b and may have the same width as the side pieces 2a, 2b and may be manufactured from the same material as the side pieces 2a, 2b.
  • the connection of the reinforcing pieces to the side pieces 2a, 2b may be done by or include welding at a distance underneath the open upper end 5 of the bag 1 , whereby the welding or connection seams may form one or more reinforcing curves 7 on each reinforcing flap 6a, 6b.
  • the reinforcing pieces may be separate sheets connected to the side pieces 2a, 2b, but in a preferred embodiment, then at the upper end 5 of the bag 1 each side piece 2a or 2b is bent over, preferably inwardly, and is welded to the side piece 2a or 2b at a distance underneath the open upper end 5 of the bag 1 , thereby forming a closed channel 8 in each reinforcing flap 6a, 6b.
  • the reinforcing curve 7 is not formed by a single straight line, and the lower edge of a reinforcing piece 9 may be at least partly unconnected to the corresponding side piece 2a or 2b.
  • the embodiments of a bag illustrated in Figs. 1a-1c are provided with two loop-handles 10a, 10 b, with a loop handle 10a, 10b being connected to each reinforcing flap 6a, 6b above the reinforcing curve or curves 7.
  • the loop handles 10a, 10b may be made from the same material as the bag 1.
  • the loop handles 10a, 10b may be welded or glued to the reinforcing flaps 6a, 6b.
  • the loop handles 10a, 10b are welded to the flaps 6a, 6b at welding points 11 , and preferably the inner faces of the reinforcing flaps 6a, 6b are also interconnected at these welding points 11 in order to strengthen the bag 1 at these areas.
  • one or more reinforcing curves 7 may be used for connecting a reinforcing piece to a side piece 2a, 2b.
  • a reinforcing curve 7 may be formed by a single, continuous connection or welding seam, or a reinforcing curve 7 may be formed by a number of separated connection or welding seams.
  • a single reinforcing curve 7 is provided at each flap 6a, 6b, with the reinforcing curve 7 extending underneath the handle 10a or 10b from one side edge 4a to the other side edge 4b of the bag 1.
  • the reinforcing curve 7 shown in Fig. 1a is formed by a single, continuous connection or welding seam, and the curve 7 is substantially sinusoidal formed with several peaks and troughs. It is seen from Fig. 1a that the total length of the connection of welding seam forming the reinforcing curve 7 is longer than the shortest distance from the side edge 4a to the side edge 4b.
  • a single reinforcing curve 7 is provided at each flap 6a, 6b, but here the reinforcing curve 7 is only extending underneath the carrying handle 10a or 10b and a little further than the welding points 11 at both end of a handle 10a or 10b.
  • the reinforcing curve 7 shown in Fig. 1b is also formed by a single, continuous connection or welding seam, and the curve 7 is substantially sinusoidal formed with several peaks and troughs. It is seen from Fig. 1b that the total length of the connection of welding seam forming the reinforcing curve 7 is longer than the shortest distance between the two outermost points 12a, 12b of the reinforcing curve 7.
  • each reinforcing curve 7a, 7b is provided at each flap 6a, 6b, with each reinforcing curve 7a, 7b extending underneath a welding point 11 of the carrying handle 10a or 10b and a little further than the welding point 11.
  • Each of the reinforcing curves 7a, 7b shown in Fig. 1c are also formed by a single, continuous connection or welding seam, and the curves 7a, 7b are substantially sinusoidal formed with several peaks and troughs. It is seen from Fig. 1c that the total length of the connection of welding seam forming a reinforcing curve 7a or 7b is longer than the shortest distance between the two outermost points 12a, 12b or 12c, 12d of the reinforcing curve 7a or 7b.
  • a bag 1 used as a carrier bag or waste bag and having reinforcing curves 7 according to one or more embodiments of the present invention may take a heavier load before breaking when compared to a normal carrier bag having a welded connection being a straight line.
  • FIGs. 2a-2c The embodiments of a bag illustrated in Figs. 2a-2c are provided with two seize openings 13a, 13 b, with one opening 13a or 13b in each reinforcing flap 6a or 6b above the reinforcing curve or curves 7.
  • a single reinforcing curve 7 is provided at each flap 6a, 6b, with the reinforcing curve 7 extending from one side edge 4a to the other side edge 4b of the bag 1 underneath the seize opening 13a or 13b.
  • the reinforcing curve 7 shown in Fig. 2a is similar to the reinforcing curve 7 of Fig. 1a.
  • a single reinforcing curve 7 is provided at each flap 6a, 6b, but here the reinforcing curve 7 is only extending underneath the opening 13a or 13b and a little further than the width of the opening 13a or 13b.
  • the reinforcing curve 7 shown in Fig. 2b is similar to the reinforcing curve 7 of Fig. 1b.
  • each reinforcing curve 7a, 7b is provided at each flap 6a, 6b, with each reinforcing curve 7a, 7b extending underneath an end part of the seize opening 13a or 13b.
  • Each of the reinforcing curves 7a, 7b shown in Fig. 2c are also formed by a single, continuous connection or welding seam, and the curves 7a, 7b are similar to the reinforcing curves 7a, 7b of Fig. 1c.
  • the embodiments of a bag illustrated in Figs. 3a-3c have two channels, where each reinforcing flap 6a, 6b forms a channel.
  • a draw band 14a, 14b is arranged in each channel of the reinforcing flaps 6a, 6b.
  • Each draw band 14a, 14b may be connected to the bag 1 at each side edge 4a, 4b.
  • an opening 15a, 15b is provided at the upper edge of each reinforcing flap 6a, 6b, with each opening 15a, 15b being arranged substantially in the middle between the side edges 4a and 4b.
  • each draw band 14a, 14b is arranged at the upper part of the corresponding flap 6a, 6b so that the draw band 14a, 14b can be seized or grabbed by a hand of a user.
  • the bags illustrated in Figs. 3a-3c may be used as waste bags.
  • a single reinforcing curve 7 is provided at each flap 6a, 6b, with the reinforcing curve 7 extending from one side edge 4a to the other side edge 4b of the bag 1 underneath an opening 15a or 15b.
  • the reinforcing curve 7 shown in Fig. 3a is similar to the reinforcing curve 7 of Fig. 1a.
  • a single reinforcing curve 7 is provided at each flap 6a, 6b, but here the reinforcing curve 7 is only extending underneath the opening 15a or 15b and a bit further than the width of the opening 15a or 15b.
  • the reinforcing curve 7 shown in Fig. 3b is similar to the reinforcing curve 7 of Fig. 1b.
  • each flap 6a, 6b four reinforcing curves 7a, 7b, 7c, 7d are provided at each flap 6a, 6b, with a single reinforcing curve 7a or 7b extending underneath each end part of the seize opening 15a or 15b.
  • Each of the reinforcing curves 7a, 7b, 7c, 7d shown in Fig. 3c are also formed by a single, continuous connection or welding seam, and the curves 7a, 7b, 7b, 7d are similar to the reinforcing curves 7a, 7b of Fig. 1c.
  • FIGs. 4a-4b have two channels, where each reinforcing flap 6a, 6b forms a channel.
  • a draw band 16a, 16b is arranged in each channel of the reinforcing flaps 6a, 6b.
  • an opening 17a, 17b is provided at the upper edge of each reinforcing flap 6a, 6b, with each opening 17a, 17b being arranged at one side edge 4b of the bag 1.
  • Each draw band 16a, 16b should be connected to the bag at the opposite side edge 4a.
  • each draw band 16a, 16b is arranged at the upper part of the corresponding flap 6a, 6b and extends out of the corresponding opening 17a, 17b, so that the draw band 16a, 16b can be seized or grabbed by a hand of a user. By pulling in the draw bands 16a, 16b the bag 1 can be closed.
  • the bags illustrated in Figs. 4a-4b may be used as waste bags.
  • a single reinforcing curve 7 is provided at each flap 6a, 6b, with the reinforcing curve 7 extending from one side edge 4a to the other side edge 4b of the bag 1 thereby also extending underneath the opening 17a or 17b.
  • the reinforcing curve 7 shown in Fig. 4a is similar to the reinforcing curve 7 of Fig. 1a.
  • each flap 6a, 6b For the embodiment of a bag illustrated in Fig. 4c, four reinforcing curves 7a, 7b, 7c, 7d are provided at each flap 6a, 6b.
  • the reinforcing curve 7d is extending underneath the opening 17a, 17b.
  • Each of the reinforcing curves 7a, 7b, 7c, 7d shown in Fig. 4b are also formed by a single, continuous connection or welding seam, and the curves 7a, 7b, 7b, 7d are similar to the reinforcing curves 7a, 7b of Fig. 1c.
  • Fig. 5 shows an embodiment of a carrier bag 1 according to the invention having two channels with draw bands 16a, 16b and two loop handle 10a, 10b, with a loop handle 10a, 10b being connected to each reinforcing flap 6a, 6b above a reinforcing curve 7 extending underneath the handle 10a or 10b from one side edge 4a to the other side edge 4b of the bag 1.
  • the bag 1 of Fig. 5 is a combination of the bags shown in Figs. 1a and 4a.
  • Each reinforcing flap 6a, 6b forms a channel with a draw band 16a, 16b being arranged in each channel.
  • an opening 17a, 17b is provided at the upper edge of each reinforcing flap 6a, 6b, with each opening 17a, 17b being arranged at one side edge 4b of the bag 1.
  • Each draw band 16a, 16b should be connected to the bag 1 at the opposite side edge 4a.
  • Each draw band 16a, 16b is arranged at the upper part of the corresponding flap 6a, 6b and above the welding points 11 of the loop handle 10a, 10b, and each draw band 16a, 16b extends out of the corresponding opening 17a, 17b, so that the draw band 16a, 16b can be seized or grabbed by a hand of a user.
  • the bag 1 can be closed.
  • the shown reinforcing curves 7 are formed by a single, continuous connection or welding seam, and the reinforcing curves are substantially sinusoidal formed with several peaks and troughs. It has been mentioned above that according to the present invention a reinforcing curve 7 may not be formed by a single straight line. However, it is within embodiments of the present invention that the reinforcing curve or curves 7 of a reinforcing flap 6a, 6b may have a number of different forms. Examples of different forms of a reinforcing curve according to the present invention are shown in Figs. 6a, 6b, 6c, 6d, 6e, 6f and 6g.
  • the reinforcing curve of Fig. 6a is substantially sinusoidal formed with several peaks and troughs and formed by a single, continuous connection or welding seam.
  • the reinforcing curve of Fig. 6b is also formed by a by a single, continuous connection or welding seam, but here the resulting reinforcing curve is made of pyramid shaped parts with several peaks or troughs.
  • the form of the reinforcing curve of Fig. 6c is substantially the same as the form of the reinforcing curve of Fig. 6b, but in Fig. 6c the resulting reinforcing curve is formed by several separated connection or welding seams, where each welding seam is a straight line having a positive or negative slope.
  • the reinforcing curve of Fig. 6d is formed of several, separated upwards arched curve parts, with each arch curve part being formed by a single connection or welding seam.
  • the reinforcing curve of Fig. 6e is formed of several, separated downwards arched curve parts, and also here each arch curve part is formed by a single connection or welding seam.
  • the reinforcing curve of Fig. 6f is also formed of several, separated curve parts.
  • the separated curve parts include upwards and downwards arched curve parts, and upwards and downwards pyramid or triangle shaped curve parts.
  • each curve part is formed by a single connection or welding seam.
  • FIG. 6g A further example of a reinforcing curve formed of several, separated curve parts is illustrated in Fig. 6g, where each curve part is a straight line with all curve parts being tilted with the same angle, and with each curve part being formed by a single connection or welding seam.
  • the pulling strength of the reinforcing flaps of a bag according to the invention may be increased considerably when compared to a normal carrier bag having the reinforcing flaps welded by a welding seam being a straight line.
  • the increase in the pulling strength may vary in accordance with the form and the total length of the welded parts of the reinforcing curve.
  • the total length of the welded parts of a reinforcing curve may vary with the amplitude of the curve or the distance between the lower parts and the upper parts of the reinforcing curve.
  • the distance between the upper and lower parts of a reinforcing curve i.e. the distance between the peaks and troughs of Fig. 6a, 6b or 6f, may in preferred embodiments of the invention be in the range of 0,5-15 mm, in the range of 1- 15 mm, in the range of 1-10 mm, in the range of 2-9 mm, in the range of 2-7 mm, in the range of2-6 mm, in the range of 3-5 mm, or in the range of 2-3 mm.
  • the distance between the upper and lower parts of a reinforcing curve is larger than 1 mm, larger than 2 mm, larger than 3 mm, larger than 5 mm, larger than 10 mm, larger than 15 mm, or larger than 20 mm.
  • Bags 1 have been described above which are provided with reinforcing flaps 6a, 6b having the inner part formed of an upper part of a side piece 2a, 2b and the outer part formed of a reinforcing piece.
  • a reinforcing piece may be a single sided sheet material and it may be a folded part of a side piece 2a, 2b. However, a reinforcing piece may also have several sheet layers and/or be doubled folded.
  • the first aspect of the invention has been described with reference to bags made of plastic material, but the first aspect of the invention may also be applied in connection with bags of paper or other foil materials.
  • foil materials is to be understood all types of thin, flexible materials that are suitable for bags, including different types of biodegradable films made of cellulose or starch.
  • bags made of a plastic material have the advantage of being impermeable to liquid, which may be critical when the bag is used as a waste bag.
  • the draw band may also be of any suitable material, such as those mentioned above.
  • plastics material in combination with a bag mad of plastics material has some manufacturing advantages, such as the possibility of welding together the bag and the draw band at certain areas.
  • Figs. 7a and 7b show a top view and a side view, respectively, of an embodiment of a bag according to the second aspect of the invention. This bag may be used for containing a fluid or liquid, and may also be use as a bag in a bag-in-box.
  • the bag 70 has a first side piece 71 and a second side piece 72 being sealingly connected to each other along side edges 73a, 73b, 73c and 73d by corresponding continuously formed sealing curves 74a, 74b, 74c and 74d.
  • a mouthpiece or sleeve 75 is arranged at the first side piece 71 in order to a allow a fluid to pass into and out of the bag.
  • the sleeve is connected to the first side piece 71 by a sleeve weld curve 76.
  • a single sealing curve 74a, 74b, 74c and 74d is provided along each side edge 73a, 73b, 73c and 73d.
  • the sealing curves 74a, 74b, 74c and 74d shown in Fig. 7a are each formed by a single, continuous connection or welding seam, and each curve 74a, 74b, 74c and 74d is substantially sinusoidal formed with several peaks and troughs. It is seen from Fig.
  • the bag 70 shown in Figs. 7a and 7b is formed of two side pieces, which are sealingly connected to each other by four sealing curves.
  • the scope of the second aspect of the invention also covers bags formed by two folded side pieces or bags formed by more than two side pieces.
  • the second aspect of the invention also covers bags having a cube like form or a pyramid shaped form.
  • the side pieces should be sealingly connected to each other when two side pieces faces each other along a common side edge.
  • the connection of side pieces along a side edge may be formed by continuously formed sealing curves according to the second aspect of the invention having at least one curve peak and/or at least one trough.
  • a bag according to the second aspect of the invention is made of a watertight material such as a plastic film or any other weldable films being impermeable to a liquid.
  • the welding curves or sealing curves 74a, 74b, 74c, 74d and 76 may be formed by heat sealing to thereby obtain a watertight sealing.
  • Figs. 8a and 8b show a side view of two embodiments of a bag according to the third aspect of the invention, which covers a bag having two handles.
  • the bags 80a, 80b of Figs. 8a and 8b may be used as carrier bags or waste bags.
  • Each bag 80a, 80b may be made from a tube of plastic film, and the tube may be flattened and provided with lateral gussets 81a, 81b, 82a, 82b at each side part 83a, 83b, 84a, 84b. Inner folds of the lateral gussets 81a, 81b, 82a, 82b are illustrated by the dotted lines 85a, 85b, 86a, 86b.
  • a transverse weld curve 87a, 87b formed as a continuous reinforcing curve extends between the side edges at the bottom of the bag 80a, 80b to thereby obtain a closed bottom end.
  • a bag opening 88a, 88b is cut in the upper part of the bag, and the cut is formed so as to extend into the lateral gussets 81a, 81b, 82a, 82b at the upper part of each side part 83a, 83b, 84a, 84b, thereby forming first and second openings, 89a, 89b, 90a, 90b, in the gussets 81a, 81b, 82a, 82b.
  • first and second handles 91a, 91b, 92a, 92b are formed.
  • Transverse weld curves 93a, 93b, 94a, 94b formed as a continuous reinforcing curves are extending between the handle side edges at the top of the bag 80a, 80b to thereby finish the formation of the handles 91a, 91b, 92a, 92b.
  • the reinforcing curves 93a, 94a of the handles 91a, 92a are formed as one continuous connection seam being sinusoidal formed and comprising several peaks and troughs.
  • the reinforcing curves 93b, 94b of the handles 91b, 92b are also formed as one continuous connection seam, but here there is only one sinusoidal formed trough.
  • each side of a handle 91a, 91b, 92a, 92b has two layers of bag side material, i.e. each side of a handle is double layered, thereby giving more strength to a handle and allowing a heavier load in the bag.
  • a bag according to the third aspect of the invention is made of a plastic material, but the third aspect of the invention may also be applied in connection with bags of paper or other foil materials.
  • foil materials is also here to be understood all types of thin, flexible materials that are suitable for bags, including different types of biodegradable films made of cellulose or starch.
  • bags made of a plastic material have the advantage of being impermeable to liquid, which may be critical when the bag is used as a waste bag.
  • the welding curves or reinforcing curves 87a, 87b, 93a, 93b, 94a, 94b may be formed by heat sealing.
  • the present invention also provides a method for heat-sealing in the longitudinally direction a moving multiple layer web of thermoplastic film, and Figs. 9a and 9b illustrates two embodiments of an apparatus for performing such heat-sealing.
  • the heat-sealing methods according to the apparatuses of Figs. 9a and 9b may be used in order to obtain a heat-sealing or welding used for the reinforcing flaps of the bags illustrated in Figs. 1a, 2a, 3a, 4a and 5.
  • thermoplastic film 101 is bended along a first side to thereby obtain a double-layered web of film 102 along the first side part.
  • the bended film part 102 is welded by use of a welding string or heating wire 103, which is arranged around the surface of a roller or drum 104, so that the outer surface of the area comprising the welding string 103 is in level with the surface of the drum 104.
  • the welding string 103 is electrically heated with electrical power supplied via the inside of the roller or drum 104.
  • the temperature of the welding string is controlled to be above the melting temperature of the film 101 , and so as to obtain a welding according to the specifications of the material of the film 101.
  • the welding string 103 may be formed as a straight curve, but according to a preferred embodiment the welding string 103 is curve shaped and may be forming a sinusoidal formed curve.
  • the welded part of the film 101 may be used in order to obtain the reinforcing flaps of the bags of Figs. 1a, 2a, 3a, 4a and 5.
  • Fig. 9b includes an enlarged drawing 107 showing the area comprising the welding string 103.
  • the welding string 103 is sinusoidal formed, and an insulating layer 108 is arranged around the welding string of heating wire 103.
  • the bended film 101 is pulled along the surface of the roller or drum 104 under light and even tension.
  • Guiding means 105 are provided to guide the film 101 when being wrapped around the roller or drum 104, and by adjusting the position of the guiding means 105, the area of the film 101 being in contact with the surface of the drum 104 can be controlled.
  • the drum 104 is free to rotate, when the film 101 is pulled along the surface of the drum 104, whereby the surface of the drum may be rotating at the substantially same speed as the movement of film 101.
  • the welding string 103 heats the film to thereby perform a proper welding.
  • the doubled layered part of the film 102 is heated or preheated by warm air, 106a, 106b, along the area, where the film web is to be welded.
  • the warm air should not be allowed to heat up the film 101 to the welding temperature, but only to a temperature below the welding temperature, whereby the actual welding is performed by the heated welding string 103.
  • the warm air could be sourced from a warm air knife, 106a, arranged above the roller or drum 104 as illustrated in Fig. 9a, but warm air could also be provided at both sides of the film 106b so as to preheat the film 101 before the film 101 reaches the roller or drum 104, as illustrated in Fig. 9b.
  • Preheating of the film 101 could also be done by use of one or more heated rollers instead of the use of warm air.
  • thermoplastic film could be used in accordance with the methods illustrated in Figs. 9a and 9b, but as an example, a linear low density polyethylene LDPE film having a welding temperature of around 130 ° C may be used.
  • the welding string 103 may be heated to a temperature of about 135 °C and the warm air may be delivered at a temperature of about 120 °C or about 115 0 C.
  • three variables may be controlled in order to obtain a high quality welding, i.e. temperature of the welding string, temperature of the heating or preheating warm air and the time of exposure of the moving film 101 to the warm air and the welding string.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)

Abstract

L'invention concerne un sac possédant une première et une seconde pièce de renforcement reliées à la première et à la seconde pièce latérale, respectivement, au niveau d'une partie supérieure du sac, formant ainsi des premier et second rabats de renforcement avec chaque rabat possédant une ou plusieurs coutures de connexion formant au moins une courbe de renforcement. L'invention concerne également un sac possédant une première et une seconde anse formées au niveau d'une partie supérieure des premières et secondes parties latérales, respectivement avec des ouvertures formées au niveau de la partie supérieure des parties latérales afin de former des ouvertures des anses avec des coutures de connexion s'étendant sur chaque ouverture et formant au moins une courbe de renforcement. La longueur totale de la/des couture(s) de connexion formant une courbe de renforcement est plus longue que la distance la plus courte entre les deux points les plus à l'extrémité de la courbe de renforcement formée, cette courbe de renforcement pouvant former une courbe de forme sensiblement sinusoïdale.
PCT/DK2006/000146 2005-03-15 2006-03-14 Sac a couture de connexion formant des courbes renforcees Ceased WO2006097104A2 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DKPA200500373 2005-03-15
DKPA200500373 2005-03-15
DKPA200500645 2005-05-02
DKPA200500645 2005-05-02
DKPA200500786 2005-05-30
DKPA200500786 2005-05-30

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WO2006097104A2 true WO2006097104A2 (fr) 2006-09-21
WO2006097104A3 WO2006097104A3 (fr) 2006-11-09

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PCT/DK2006/000146 Ceased WO2006097104A2 (fr) 2005-03-15 2006-03-14 Sac a couture de connexion formant des courbes renforcees

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4091963A1 (fr) * 2021-05-18 2022-11-23 W. Pelz GmbH & Co. KG Sachet à cordon d'une matière de film plastique thermoplastique
US11814225B2 (en) 2019-03-28 2023-11-14 The Glad Products Company Multi-film thermoplastic structures having visually-distinct contact areas arranged in text and methods of making the same
US11970310B2 (en) 2019-03-28 2024-04-30 The Glad Products Company Multi-film thermoplastic bags having grab zones with contact areas and methods of making the same
US12459714B2 (en) 2019-03-28 2025-11-04 The Glad Products Company Multi-film thermoplastic bags with zones of contact areas having variable lamination

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Publication number Priority date Publication date Assignee Title
BE754295A (fr) * 1970-01-20 1970-12-31 Munksjoe Ab Sac a provisions pourvu d'une poignee, procede de fabrication de tels sacs et machine pour realiser ce procede
FI58469C (fi) * 1978-06-15 1981-02-10 Suominen Heikki S Koepkasse av plastmaterial
DE8900883U1 (de) * 1989-01-26 1989-03-16 INDAG Gesellschaft für Industriebedarf mbH, 6900 Heidelberg Standbeutel
DE3925981A1 (de) * 1989-08-05 1991-02-07 Hoechst Ag Prismatischer standbeutel fuer fliessfaehige fuellgueter
DK1252073T3 (da) * 2000-01-12 2003-09-29 Etradan Bs Aps Bærepose med træksnor og bærehåndtag
US6461041B1 (en) * 2000-02-15 2002-10-08 Ebrahim Simhaee Gussetted plastic bag
FR2858809B1 (fr) * 2003-08-13 2006-05-26 Sp Metal Sac a doublelien coulissant elastique et non-elastique et procede de fabrication d'un tel sac
US7219814B2 (en) * 2004-01-09 2007-05-22 Built Ny, Inc. Totes for bottles

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11814225B2 (en) 2019-03-28 2023-11-14 The Glad Products Company Multi-film thermoplastic structures having visually-distinct contact areas arranged in text and methods of making the same
US11970310B2 (en) 2019-03-28 2024-04-30 The Glad Products Company Multi-film thermoplastic bags having grab zones with contact areas and methods of making the same
US12084230B2 (en) 2019-03-28 2024-09-10 The Glad Products Company Multi-film thermoplastic structures and bags having visually-distinct contact areas and methods of making the same
US12187511B2 (en) 2019-03-28 2025-01-07 The Glad Products Company Multi-film thermoplastic bags having hem seals comprised of continuous contact areas and methods of making the same
US12459714B2 (en) 2019-03-28 2025-11-04 The Glad Products Company Multi-film thermoplastic bags with zones of contact areas having variable lamination
EP4091963A1 (fr) * 2021-05-18 2022-11-23 W. Pelz GmbH & Co. KG Sachet à cordon d'une matière de film plastique thermoplastique

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