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
• • 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
  • B65D75/5833—Tear-lines provided in a wall portion for tearing out a portion of the wall
  • B65D75/5844—Tear-lines provided in a wall portion for tearing out a portion of the wall the portion of the wall being a narrow strip, e.g. between lines of weakness
• • 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
  • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
  • B65D85/07—Containers, packaging elements or packages, specially adapted for particular articles or materials for compressible or flexible articles
  • B65D85/08—Containers, packaging elements or packages, specially adapted for particular articles or materials for compressible or flexible articles rod-shaped or tubular
  • B65D85/10—Containers, packaging elements or packages, specially adapted for particular articles or materials for compressible or flexible articles rod-shaped or tubular for cigarettes
• • 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
  • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
  • B65D85/07—Containers, packaging elements or packages, specially adapted for particular articles or materials for compressible or flexible articles
  • B65D85/08—Containers, packaging elements or packages, specially adapted for particular articles or materials for compressible or flexible articles rod-shaped or tubular
  • B65D85/10—Containers, packaging elements or packages, specially adapted for particular articles or materials for compressible or flexible articles rod-shaped or tubular for cigarettes
  • B65D85/1072—Bundle of cigarette packs
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/15—Sheet, web, or layer weakened to permit separation through thickness

Definitions

• the present invention relates to a biaxially oriented polypropylene film with perforation and a package of biaxially oriented polypropylene film with a perforation as an opening aid.
• biaxially oriented plastic films particularly thermoplastic polymer films, and especially biaxially oriented polypropylene films
• the polyolefin film protects the packaged goods against rapid drying or loss of flavor with very low material usage.
• Uniaxially oriented films show a low tear strength in the direction of orientation and can be easily controlled in this direction and tear further.
• uniaxially oriented films are not usable in many fields, among other things due to insufficient transverse mechanical strengths.
• the biaxial orientation on the one hand, produces the desirable high strengths (moduli) in both dimensions; on the other hand, but also the preferred directions are equalized. This has the consequence that for opening a foil packaging (eg biscuit bag) first a high force must be overcome in order to tear the foil.
• a crack will be planted even when using very low tensile forces uncontrollably continued.
• WO 98/2312 describes packages which are pre-cut by a laser beam. These packages have a multilayer structure. In particular, a metallic intermediate layer is provided which is intended to prevent the laser beam from cutting through the film. This packaging is lavish and expensive due to the lamination with a metal layer. About the exact configuration of the packaging is disclosed in the description nothing.
• the perforated film must have sufficient mechanical stability so that the perforated film can be used to package the piece goods.
• the perforation is integrated as a processing step in the packing process. This solution avoids any mechanical stresses on the perforated film, e.g. when winding up and unwinding.
• the integration of the perforation is not possible in all packaging processes. Firstly, the spatial conditions in the existing system are often designed so that there is simply no room to grow such a device. Furthermore, the packaging processes in the cigarette industry are running at very high speeds, which may be too fast for the perforation. Therefore, it is not always possible to incorporate a device for perforating the foil into a device for bar wrapping cigarette packets. A sufficient mechanical stability of the film is contrary to the same desire for an easy-open packaging.
• the object of the present invention was to provide an improved package for ordered cargo available.
• the object is further achieved by a method for wrapping piece goods, in which a perforated film unwound from a roll and used for packaging the piece goods.
• FIG. 1 shows an embodiment of the film (2) with circular perforations (1) with a length (diameter) B.
• the length of the distances between the perforations corresponds to the length A.
• Both parallel perforation lines are arranged at a distance from each other C.
• the distances A are the same length as the length of the perforations B.
• the perforation line are offset relative to one another such that the center of the respective perforation is aligned with the center of the opposite distance.
• FIG. 2 shows a film with circular perforations whose length B is greater than the distances A.
• FIG. 3 shows perforations with a rectangular geometry, wherein here too B> A.
• Fig. 4 shows a film with diamond-shaped perforations, as they are produced for example by rotating blades.
• Fig. 5 shows a film with elliptical perforations. Again, B> A.
• Fig. 6 shows a possible geometry of a needle perforation which results in propeller-like perforations.
• Fig. 7 shows a film web having a plurality of perforation double lines in Longitudinal direction.
• Fig. 8 shows a package (3), which is opened by breaking along the perforation double line (4).
• the packaging according to the invention is particularly suitable for ordered or stacked piece goods, e.g. Cigarette packs, as well as pasty products such as butter, sausage and the like suitable. It is possible for the consumer to tear the film along a predetermined predetermined breaking point in such a way that individual pieces can be removed without further units falling out uncontrollably in the case of piece goods.
• the individual segments between the parallel perforation lines are adapted according to the size of the unit to be removed. This can be used to control whether one or more units can be conveniently removed with one open.
• the perforation lines can be applied to the film web in a suitable pattern.
• the lines are straight.
• the perforation lines can be produced by mechanical perforation, for example by means of needles or knives or by a laser beam or in another way, so that a continuous hole is formed in the film.
• perforations are also understood as meaning thin areas in which no continuous hole is produced in the film, but the film only becomes thinner at the corresponding points due to removal of material, for example by a laser beam which only penetrates to a predetermined depth.
• incisions or thin places alternately undamaged film sections whose length A is determined by the distance of the perforations.
• distances are thus the areas of undamaged film which extend from the end of a perforation to the beginning of the subsequent perforation in the same perforation line.
• the geometric shape of the perforation can vary and depends on the perforation method. Needles or rotating blades can be used for the perforation. For perforation lines from non-continuous thin sites, laser or ultrasound are preferred. Needle perforations create circular or ellipsoidal or propeller-like shapes that result from the needle and foil being in contact at the perforation and moving relative to each other. Knife perforations produce more rectangular or diamond-shaped cuts or thin spots. Laser and ultrasound methods allow different geometric shapes. Except in the case of circular perforations, all perforations have a greater extension in one of the two principal directions (longitudinal direction) aligned along the line of perforations.
• the perforations have in the longitudinal direction in general a length B of 0.1-8 mm, preferably 0.3 to 6 mm, in particular 0.5 to 3 mm.
• the extent of the perforation transversely to this longitudinal direction is correspondingly smaller and is generally 5 to 80%, preferably 10 to 50% of its extension in the longitudinal direction. This does not apply to circular perforations.
• Circular and approximately circular perforations have a diameter of 0.1-6 mm, preferably 0.3 to 5 mm, in which case the diameter of the length of the perforation B corresponds.
• perforations with a length of> 1 to 6 mm are preferred, in particular also lengths of 1, 5 to
• Strengths of the film is not affected. These embodiments can be excellent to wind up a film roll and unwind easily on the packing machine again.
• the length A of the sections, ie the undamaged film between the perforations is 0.05 to ⁇ 8mm, preferably 1 to 6mm.
• distances of> 4 to 10 mm are preferred.
• the dimensions of the distances A are selected in relation to the length B of the perforation so that these lengths B of the perforations are at least as large or larger than the distances A.
• the length or diameter of a perforation is at least 10% greater than the length of the gaps.
• the length A of the distances is 10 to 90% of the length B of the perforations, preferably 20 to 85%.
• the dimensions given for the perforations and distances apply in the same way also to perforations in the form of non-continuous thin spots, which in turn may likewise be circular, elliptical or oblong.
• the dimensions of the distances between the perforations are generally constant, or vary only slightly within the usual manufacturing accuracy. In the same way, the size of the individual perforations along a line does not vary or only slightly (up to 10%), ie, for example, the diameter of the holes or the length of a perforation is constant.
• the perforations and distances of the two parallel perforation lines of a predetermined breaking point have approximately the same dimensions. It is essential to the invention that an intended breaking point is formed from two parallel perforation lines, which are arranged at a distance C of not more than 10 mm. The distance C of these two lines is preferably 0.5 to 8 mm, in particular 0.8 to 5 mm.
• the second feature of the predetermined breaking point which is essential to the invention is the arrangement of the perforations of the two parallel perforation lines relative to each other. It has been found that an offset arrangement of the perforations of the two lines improves the control of crack propagation surprisingly.
• a perforation of the second line does not start at the same height as the opposite perforation of the first line.
• the perforation of the second line at least partially covers the distance of the first perforation line.
• the portions of the one perforation line are completely covered by the perforations of the opposite lines.
• the center of the sections of the first perforation line is aligned with the center of the respective opposite perforations of the second perforation line, so that a symmetrical perforation pattern is formed.
• the arrangement of two parallel, mutually offset perforation lines significantly improves the control of the crack profile.
• the invention also makes it possible to break off the packaging at the predetermined breaking point over the edges of the piece good if the piece goods have a corresponding mechanical stability and the piece goods in the package is arranged so that its edge extends at the level of the double line.
• the perforation lines are generally applied in the machine direction of the film. The perforation can be combined simultaneously with the cutting of the film to narrower film widths and thus carried out in one operation. Alternatively, the perforation can also be done before or after cutting to the finished film width.
• the film for perforation for example, over rollers with suitable perforation tools out, for example, these rollers are equipped with needles or knife blades.
• appropriate tools are positioned below or above the film web.
• the film to be perforated is unwound from a roll, the perforations according to the invention are applied and the perforated film is then rewound and the roll used at the facilities for packaging of piece goods, ie unwound and used for wrapping the goods.
• the perforations do not or only insignificantly impair the wrapping behavior of the film, so that the perforated film can be wound up and unwound with the usual devices.
• the roll of perforated film is used to make the package of the invention.
• the packaging according to the invention is particularly suitable for ordered or stacked piece goods, as well as pasty products such as butter, sausage and the like. It is possible for the consumer to tear the film along a predetermined predetermined breaking point in such a way that individual pieces can be removed without other uncontrolled fall out in the case of general cargo.
• the individual segments are adapted according to the size of the unit to be removed. This can be used to control whether one or more units can be conveniently removed after opening.
• the film used is generally a biaxially oriented film of polypropylene.
• the film can be a translucent to transparent or an opaque film.
• "opaque film” means an opaque film whose light transmittance (ASTM-D 1003-77) is at most 70%, preferably at most 50%.
• the film can basically be constructed as a single layer or as a multilayer.
• laminates which are preferably constructed from the films described herein.
• the formulation of the film and the type of laser can be coordinated so that the laser beam in the field of thinning leaves a white or colored line.
• thermoplastics for the film are polyolefins of olefinic monomers having 2 to 8 carbon atoms.
• Propylene polymers, ethylene polymers, butylene polymers, cycloolefin polymers or copolymers of propylene, ethylene, butylene units or cycloolefins are particularly suitable.
• the layers of the film, or the layer for single-layer embodiments at least 50 wt .-%, preferably 70 to 99 wt .-%, in particular 90 to 98 wt .-%, of the thermoplastic polymer, each by weight the layer.
• propylene polymers are preferred. These propylene polymers contain 90 to 100 wt .-%, preferably 95 to 100 wt .-%, in particular 98 to 100 wt .-%, of propylene and has a melting point of 120 0 C or higher, preferably 130 to 17O 0 C, and im in general a melt flow index of 0.5 g / 10 min to 15 g / 10 min, preferably 2 g / 10 min to 10 g / 10 min, at 230 0 C and a force of 21, 6 N (DIN 53 735).
• Isotactic propylene homopolymer having an atactic content of 15% by weight and less copolymers of ethylene and propylene having an ethylene content of 10% by weight or less, copolymers of propylene with C 4 -C 8 olefins having an olefin content of 10% by weight. % or less, terpolymers of propylene, ethylene and butylene having an ethylene content of 10% by weight or less and having a butylene content of 15% by weight or less are preferred propylene polymers for the core layer, with isotactic propylene homopolymer being particularly preferred.
• the stated percentages by weight relate to the respective polymer.
• Suitable other polyolefins in the polymer blend are polyethylenes, especially HDPE, LDPE 1 VLDPE and LLDPE, wherein the proportion of these polyolefins each 15 wt .-%, based on the polymer mixture, does not exceed.
• a layer, preferably the base layer or an intermediate layer, of the film for opaque embodiments may additionally contain pigments and / or vacuole-initiating particles in customary amounts.
• the film of the invention may be single-layered, preferably the film is multi-layered.
• one or both sides of the intermediate layer and / or cover layers may be applied to the base layer.
• multi-layered embodiments of the film in addition to the base layer, optionally intermediate layers and outer layers.
• These additional cover layers and / or intermediate layers are generally composed of polyolefins. They contain at least 70 wt .-%, preferably 75 to 100 wt .-%, in particular 90 to 98 wt .-%, of a polyolefins. As polyolefins for these additional layers are basically the same polymers as described above for the base layer.
• butylene content of 4 to 25 wt .-%, preferably 10 to 20 wt .-%, each based on the total weight of the copolymer, or
• the co- or terpolymers described above generally have a melt flow index of from 1.5 to 30 g / 10 min, preferably from 3 to 15 g / 10 min.
• the melting point is in the range of 120 to 140 0 C.
• the blend of copolymers and terpolymers described above has a melt flow index of 5 to 9 g / 10 min and a melting point of 120 to 150 0 C. All the melt flow indices given above are measured at 230 0 C and a force of 21, 6 N (DIN 53 735) measured.
• Layers of co- and / or terpolymers preferably form the outer layers of sealable embodiments of the film.
• the total thickness of the film can vary within wide limits and depends on the intended use.
• the preferred embodiments of the film have total thicknesses of 5 to 250 microns, with 10 to 100 .mu.m, in particular 20 to 80 microns, are preferred.
• the base layer is the layer which makes up more than 50% of the total thickness of the film. Their thickness results from the difference between the total thickness and the thickness of the applied cover and intermediate layer (s) and can therefore vary within wide limits analogously to the total thickness.
• Cover layers form the outermost layer of the film and are 0.5 to 5 microns, preferably 1 to 3 microns.
• the intermediate layer is between 1 and 20 microns, preferably 1 to 10 microns.
• both the base layer and the intermediate layer (s) and the topcoat (s) may contain additives in an effective amount, preferably hydrocarbon resin and / or antistatics and / or antiblocking agents and / or lubricants and / or or stabilizers and / or neutralizing agents which are compatible with the polymers of the core layer and the top layer (s), with the exception of the generally incompatible antiblocking agents.
• the films are produced by the extrusion process known per se.
• the melts corresponding to the individual layers of the film are extruded through a flat die.
• the film thus obtained is stripped to solidify on one or more roll (s) and cooled.
• the temperature of the off roll or rolls is 10 to 90 0 C, preferably 20 to 60 0 C.
• the film is stretched biaxially.
• the biaxial stretching can be carried out simultaneously or sequentially, with the successive biaxial stretching in which stretching is first longitudinal (in the machine direction) and then transverse (perpendicular to the machine direction) is particularly favorable.
• In the longitudinal direction is preferably 3: 1 to 7: 1 and at a temperature of less than 140 C C, preferably in the range of 125 to 135 0 C stretched.
• In the transverse direction is preferably 5: 1 to 12: 1, at a temperature of greater than 140 0 C, preferably at 145 to 16O 0 C, stretched.
• the longitudinal stretching will be carried out expediently with the help of two different speeds corresponding to the desired stretching ratio and the transverse stretching with the aid of a corresponding clip frame.
• biaxial stretching can also be carried out simultaneously in the longitudinal transverse direction. These simultaneous stretching methods are known per se in the prior art.
• the film is held in conclusion about 0.5 to 10 s at a temperature of 110 to 15O 0 C for heat-setting (heat treatment).
• one or both surfaces of the film may be corona or flame treated by one of the known methods.
• the film may be laminated, coated, melt-coated, painted or laminated by further processing steps to provide the film with further advantageous properties.
• laminates composites of polypropylene films and polyethylene films are particularly preferred. Such composites can be produced by lamination of the individual films.
• Another technically advantageous variant for the production of PP / PE laminates is the extrusion coating of a suitable polyethylene onto a biaxially oriented polypropylene film.
• the packaging according to the invention is characterized by a controllable tear behavior.
• the force required to initiate a tear at the foil edge can be reduced by a notch, preferably V-shaped.
• the packaging is much easier and more controlled to continue.
• conventional film packaging also have, such as high mechanical strength, water and oxygen barrier, good optical properties.
• the packaging according to the invention is particularly advantageous to use for piece goods, in particular for stacked units, such as biscuits, cigarette packets or pressed food moldings.
• the film with the perforation according to the invention enables a novel packaging solution for cigarette rods.
• the packets of cigarettes are stacked and wrapped in the film with the perforation according to the invention. These cigarette rods can then be opened at the predetermined breaking point by breaking along the perforation line.
• a transparent three-layer ABA film with a symmetrical structure with a total thickness of 20 ⁇ m was produced by coextrusion and subsequent stepwise orientation in the longitudinal and transverse directions.
• the cover layers had a thickness of 0.6 ⁇ m in each case.
• a cover layers about 75% by weight of ethylene-propylene random copolymer having a C2-
• the film was then coated on a surface with a sealable acrylate coating.
• the film was then cut to 350mm width into narrow cuts and wound up. These narrow cuts (rolls) were passed in a second step on a needled rollers and provided in the longitudinal direction of the film with perforation lines, which were arranged in parallel at a distance of 6mm.
• the perforation had a propeller-like shape with a length B of 4 mm. The distances between the individual perforations was 2mm.
• the thus perforated film was wound up into a roll of perforated film.
• the perforated film was then used for a bar wrap with 12 cigarette sachets.
• the packets were arranged so that the edges of the packets were at the level of the perforation line.
• the packets could be removed by breaking along the perforation line, without causing uncontrolled crack propagation in the film. Comparative example
• a single-row perforation was applied to the film described in Example 1 with a similar needle roller.
• the perforations were the same length and spacing as in Example 1.
• the film was used in the same way for the bar wrap of 12 cigarette sachets.
• the packaging could not be opened by breaking. When attempting to tear the film along the perforation line, 3 out of 10 attempts led to an uncontrolled tear along the perforation line.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wrappers (AREA)
• Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
• Laminated Bodies (AREA)
• Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
• Packages (AREA)
• Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Priority Applications (13)

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Citations (5)

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• 2010
  • 2010-08-26 UA UAA201203726A patent/UA115860C2/uk unknown
  • 2010-08-26 CN CN201080038415.8A patent/CN102498047B/zh not_active Expired - Fee Related
  • 2010-08-26 DE DE202010018143.7U patent/DE202010018143U1/de not_active Expired - Lifetime
  • 2010-08-26 CA CA2771912A patent/CA2771912A1/en not_active Abandoned
  • 2010-08-26 US US13/391,901 patent/US20120152773A1/en not_active Abandoned
  • 2010-08-26 EA EA201270329A patent/EA023195B1/ru not_active IP Right Cessation
  • 2010-08-26 WO PCT/EP2010/005223 patent/WO2011023385A1/de active Application Filing
  • 2010-08-26 AU AU2010288875A patent/AU2010288875B2/en not_active Ceased
  • 2010-08-26 MX MX2012002474A patent/MX2012002474A/es unknown
  • 2010-08-26 JP JP2012525930A patent/JP2013503080A/ja active Pending
  • 2010-08-26 EP EP10752721.0A patent/EP2470441B1/de not_active Not-in-force
  • 2010-08-26 BR BR112012004390A patent/BR112012004390A2/pt not_active Application Discontinuation
  • 2010-08-26 PL PL10752721T patent/PL2470441T3/pl unknown
  • 2010-08-26 KR KR1020127005581A patent/KR20120059519A/ko not_active Application Discontinuation
• 2012
  • 2012-02-24 ZA ZA2012/01384A patent/ZA201201384B/en unknown

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