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
  • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
  • B65D75/52—Details
  • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
  • B65D75/5827—Tear-lines provided in a wall portion
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
  • B65D75/04—Articles or materials wholly enclosed in single sheets or wrapper blanks
  • B65D75/20—Articles or materials wholly enclosed in single sheets or wrapper blanks in sheets or blanks doubled around contents and having their opposed free margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding

Definitions

• the present invention relates to a package forming at least one pocket delimited by at least one flexible film having two principal faces which are connected to one another along at least two opposing transverse connecting lines which delimit the said pocket between them,
• each principal face has a weakened line which allows the upper end of the package to be removed entirely by tearing it simultaneously along the two weakened lines.
• the two weakened lines are disposed at the same level along the length of the package and meet along the welded longitudinal edges of the package.
• the object of the invention is to propose a package in which opening is made easier.
• the invention relates to a package as defined in Claim 1.
• FIG. 1 shows a perspective view of a closed package according to the invention
• Figure 2 shows a sectional view of the package of Figure 1 along the central longitudinal section line H-II 9 the package being closed;
• Figures 3 and 4 show views identical to that of Figure 2 during successive phases of opening; and - Figure 5 shows a perspective view of the package of Figure 1 during the final phase of opening.
• the package illustrated in Figures 1 and 2 in its closed state is intended for example to contain food products P. It is formed from one single flexible film 12 made from polymers.
• the film 12 is folded back on itself at a lower end of the package in order to form a front face 14 and a rear face 16 which are connected to one another by a transverse connecting line 18 formed by a fold of the film on itself.
• the fold 18 is welded on itself in order to be flattened.
• the faces 14 and 16 are welded to one another at their end opposite the connecting line 18 by another transverse connecting line 20.
• the connecting lines 18 and 20 extend substantially parallel to one another.
• the length of the front face 14 measured between the transverse connecting lines 18, 20 is less than the length of the rear face 16 measured between these same lines.
• front face 14 and the rear face 16 are connected to one another by longitudinal welds 22, 24 extending parallel to one another and connecting the two transverse connecting lines 18 and 20 in order to form an initially closed package.
• the film 12 delimits between the two longitudinal welds 22, 24 a package body 26 in which the products P to be packaged are contained.
• the rear face 16 of greater length has a fold 30 which, is more easily visible in Figure 3 and of which the length corresponds to double the difference in length between the front and rear faces.
• the fold 30 is formed from a folding line 32 fo ⁇ ned at the top of the fold.
• the two front and rear faces 14 and 16 form a flap 34 where they extend strictly parallel to one another.
• the flap 34 is capable of being received on the outer surface of the front face 14.
• a folding line 36 is formed transversely on the front face 14.
• the faces 14 and 16 are connected by a weld formed at their ends at the location of the connecting line 18. If the package is formed from one single sheet, the connecting line 20 is then formed solely from one fold which if necessary can be flattened by a weld.
• connection between the two ends of the film forming the faces 14, 16 is effected along the connecting line 32, and folds, which may be finished off by welds, are only formed at the level of the lines 18 and 20.
• the two ends of the film are welded to one another in the current part of the face 14 or in the current part of the face 16.
• the package is formed from a plurality of films welded to one another. For example, one film is used to form the face 16 and the upper surface of the flap 34 whilst another film constitutes the face 14 and the outer surface of the flap 34.
• the front face 14 has an area 40 of more or less substantial width designated by a transverse weakened line which extends over all or part of the width of the face from a longitudinal weld 22 to the opposing longitudinal weld 24. Ideally, this weakened line extends to the immediate vicinity of the folding line 36 in a region of the front face 14 covered by the flap 34.
• the weakened line 40 is provided facing the fold 30 and therefore along the folding line 36 or in the vicinity thereof.
• Figure 2 shows an advantageous position of the line 40 whilst Figure 3 shows the ideal position.
• opening of the package can be achieved in the central part of the package but is difficult or impossible in the vicinity of the longitudinal welds 22 and 24.
• This weakened line 40 is formed by treatment of the film 12.
• the treatment is applied before the shaping of the package whilst the film is in the course of manufacture, during the operation of winding onto a reel.
• this weakening could equally be made during, before or after the different steps intended to obtain the finished product with the product P packaged.
• the weakened line 40 is produced by application of high- energy radiation, such as a laser, applying a high-energy beam along the course of the line which is to be weakened.
• This high-energy treatment is carried out on one or several layers of the film when the film comprises more than one layer.
• the weakened line 40 is formed by a mechanical weakening of the film which extends along the course of the weakened line.
• This mechanical treatment is carried out along one or several of the layers of the film when the film comprises more than one layer.
• microporous weakening is carried out in order to form the weakened line.
• Such microporous treatment is carried out for example by passing the illm > or a layer of the film when the film comprises several layers, between two rollers, one of the rollers having a surface which has been rendered abrasive in the zone which is to be applied to the line to be weakened.
• Such treatment is described for example in the document FR-2 717449.
• the mechanical weakening is obtained by cutting or stamping partially or completely the thickness of one or several layers of the film when the film comprises more than one layer. These cuts or stampings are formed by applying a die with cutting blades along the weakened line. During the treatment, the film is pressed between the die and a support, as is known per se. Thus the part which is cut or partially cut is formed of perforations,
• the weakened line 40 is formed by a microperforated region which does not pass completely through the film but reduces the resistance to rupture of the film in the treated zone. These microperforations can penetrate only through one of the layers of the film when the film comprises several layers.
• a combination of the weakening treatments described above can be carried out on one and the same film, either on one and the same layer of the film or on different layers of the film if the film comprises more than one layer.
• the film comprises a plurality of laminated or co- extruded polymer layers, in particular it has a support layer associated with a sealing layer, a connecting layer being disposed between these two layers in order to connect them over their entire surface.
• the sealing layer forms the inner layer of the package.
• the support layer has a weakened area made by high-energy radiation and in particular a laser beam. It is equally possible to use mechanical cutting (rotary cutter / blades / etc.. ,) of the support layer before it is joined to the sealing layer.
• the welding layer does not receive any weakening treatment.
• a weakening treatment is provided along the course of the weakened line 40 in the welding layer.
• This treatment preferably consists of rendering the welding layer fragile along the course of the weakened line 40, particularly by passing the welding layer between two rollers, one of which is abrasive, i ⁇ order to roughen one of the surfaces of the welding layer.
• This surface is advantageously disposed on the side of the connecting layer.
• the force of rupture on tearing of the film 12 along the weakened line 40 is preferably between 3 N/15 mm and 50 N/15 mm, that is to say that it is appropriate to apply a force of 3 N to 50 N transversely with respect to a weakened line 40 having a length of 15 mm in order to obtain rupture of the membrane along the weakened line. It is preferably between 4 N/15 mm and 40 N/15 mm.
• composition of the film and the treatments carried out can adjust the rupture as a function of the tearing force chosen.
• the longitudinal welds 22 and 24 extend along the package body 26, the fold 30 and the flap 34 between the inner surfaces of the film, in such a way that the welds 22 and 24 comprise three welded sections converging at one and the same point denoted 42 in Figure 1 and disposed in the region of articulation between the package body 26, the fold 30 and the flap 34.
• welds 20, 22, 24 carried out arc of the skin/skin type, that is to say that only areas of one and the same surface of the film 12 are welded to one another, Thus the welds are only produced between areas of the inner surface of the package, and no weld is produced from an area of the outer surface of the package.
• the film 12 is preferably formed from a material comprising a plurality of layers, the layer forming the inner surface of the package constituting a sealing layer capable of being welded to itself, whilst the layer forming the outer surface of the package is a non- sealing layer, that is to say a layer of which the welding temperature is higher than the welding temperature of the layer forming the inner surface.
• the film 14 is made from oriented polyamide or polyester for the outer layer and polyethylene for the inner layer.
• the flap 34 is tilted and brought substantially into an extension of the body of the pocket at the location initially occupied by the fold 30. In this position then the package is in the configuration illustrated in Figure 3.
• the operator exerts traction in opposite directions. Taking into account the difference in length between the front face 14 and the rear face 16, the force exerted by the operator is exerted solely on the front face 14.
• the film breaks at a point on this line 40 and the break spreads progressively along the length of this line until the two longitudinal welds 22, 24 are reached, as illustrated in Figures 4 and 5 or simultaneously along the entire weakened line.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Packages (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=35429258

Family Applications (1)

Country Status (13)

Families Citing this family (6)

Citations (4)

Family Cites Families (4)

• 2005
  • 2005-03-29 DE DE602005002729T patent/DE602005002729T2/de active Active
  • 2005-03-29 EP EP05290696A patent/EP1707497B1/en active Active
  • 2005-03-29 PL PL05290696T patent/PL1707497T3/pl unknown
  • 2005-03-29 SI SI200530089T patent/SI1707497T1/sl unknown
  • 2005-03-29 AT AT05290696T patent/ATE374720T1/de active
  • 2005-03-29 PT PT05290696T patent/PT1707497E/pt unknown
  • 2005-03-29 ES ES05290696T patent/ES2294653T3/es active Active
  • 2005-03-29 DK DK05290696T patent/DK1707497T3/da active
• 2006
  • 2006-03-29 US US11/910,355 patent/US20080277459A1/en not_active Abandoned
  • 2006-03-29 WO PCT/IB2006/000707 patent/WO2006103525A1/en active Application Filing
  • 2006-03-29 NZ NZ561239A patent/NZ561239A/en not_active IP Right Cessation
  • 2006-03-29 CA CA002601511A patent/CA2601511A1/en not_active Abandoned
  • 2006-03-29 AU AU2006228392A patent/AU2006228392A1/en not_active Abandoned

Patent Citations (4)

Also Published As

Similar Documents

Legal Events