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
  • B65D27/00—Envelopes or like essentially-rectangular containers for postal or other purposes having no structural provision for thickness of contents
  • B65D27/32—Opening devices incorporated during envelope manufacture
  • B65D27/38—Tearing-strings or -strips
• • 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
  • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
  • B65D77/22—Details
  • B65D77/30—Opening or contents-removing devices added or incorporated during filling or closing of containers
  • B65D77/32—Tearing-strings or like flexible elements
• • 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
  • B65D75/66—Inserted or applied tearing-strings or like flexible elements
• • 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
  • B65D85/1018—Container formed by a flexible material, i.e. soft-packages
  • B65D85/1027—Opening devices

Definitions

• the present invention relates to a tear strip for a package, a method for producing such a tear strip and a package with such a tear strip.
• a disadvantage of these paper-based tear strips is the fact that they show a significantly poorer tearing behavior than the previous plastic-based tear strips, since the paper-based tear strips often tear off when they are torn open and the packaging does not open or only opens partially.
• a first aspect of the invention relates to a tear strip for packaging, comprising a layer system which has a paper substrate and an adhesive layer arranged on a first side of the paper substrate.
• improved tearing behavior is achieved in that the adhesive layer has an uneven surface structure with relative elevations and relative depressions, at least in regions.
• a paper-based tear strip is provided according to the invention, the adhesive layer of which has an uneven surface structure with relative elevations (“heights”) and relative depressions (valleys, cups) in some areas or completely.
• the inventors assume that the improved tear-off behavior is achieved by this uneven surface structure, since the tear strip can thus be bonded to an associated packaging to varying degrees locally, since the depressions or valleys lead to a local weakening of the bond, while the elevations or heights lead to a more intimate material connection and thus to a firmer bond.
• the local weakening of the adhesive bond prevents the paper-based tear strip from sticking too tightly and tearing off.
• the elevations reliably prevent the adhesive bond with the associated packaging being too weak overall.
• the adhesive layer has between 20 and 100 bumps per square centimeter of paper substrate.
• the adhesive layer can consist of one or more suitable adhesives exist and may contain additives.
• an adhesive based on poly(meth)acrylate, a natural or synthetic rubber and/or a sealing wax can be used.
• a/an in the context of this disclosure should be read as an indefinite article, i.e. always as “at least one/at least one” unless expressly stated otherwise. Conversely, “a/an” can also be understood as "only one/only one”.
• the paper substrate is compostable and/or biodegradable. This achieves an improved environmental balance.
• the paper substrate has a grammage between 80 g/m 2 and 200 g/m 2 , in particular between 100 g/m 2 and 140 g/m 2 , in particular about 120 g/m 2 . This ensures sufficient stability of the paper substrate and thus advantageous sealing and tearing behavior of the tear strip for most applications and embodiments.
• the amount of adhesive applied per unit area of the paper substrate is particularly preferably selected as a function of or as a function of the grammage of the paper substrate, with higher amounts applied per unit area generally being selected for higher grammages.
• the paper substrate has a stability of at least 75 N/15 mm, preferably at least 110 N/15 mm and/or a thickness of between 100 ⁇ m and 250 ⁇ m in a main extension direction. in particular between 150 pm and 200 pm.
• a main direction of extent is understood to mean the direction of the longest extent of the tear strip, that is to say generally the extent along which the associated packaging is torn open.
• first and/or a second side of the paper substrate is or are embossed and/or bleached and/or colored and/or printed.
• the tear strip can be optically and/or functionally adapted to different requirement profiles in a particularly simple manner.
• an embossed paper substrate can provide better release of the non-stick second side.
• the adhesive layer is applied to the first side over the entire surface or in sections.
• the adhesive layer is provided that either the entire surface of the paper substrate is provided with the adhesive layer, or only one or more surface areas. This allows the sticking and tearing behavior to be controlled.
• advantageous tearing behavior is achieved by the adhesive layer having an application weight of between 15 g/m 2 and 60 g/m 2 , in particular between 20 g/m 2 and 30 g/m 2 .
• the adhesive layer has a regular surface structure, in particular a dot structure and/or a wavy structure and/or a line structure and/or a pyramid structure and/or a truncated pyramid structure and/or a hexagonal structure and/or a line structure with cups and/or a dome structure.
• the elevations and depressions of the surface structure thus have regularly arranged structure elements, it being possible for only a single type of structure element or two or more types of structure element to be provided. In the case of several structural element types, these can generally have the same or different volumes.
• an additionally improved tearing behavior results from the fact that the surface structure of the adhesive layer has a periodic structural element at least in regions, with at least one Extension vector of the periodicity of the structural element is preferably arranged obliquely to the main direction of extension of the paper substrate.
• the extension vector of the periodicity of the structural element is not arranged parallel or coaxial, but at an angular position other than 0° or 180° to the main extension direction of the paper substrate.
• a separating layer is arranged over the entire surface or in sections on the second side of the paper substrate, with an application weight of the separating layer preferably between 0.1 g/m 2 and 2.0 g/m 2 , in particular between 0.2 g/m 2 and 1.0 g/m 2 .
• the separating layer can be silicone-based, although in principle other separating layers based on polyacrylate, carbamate, polyvinyl ether wax or other suitable compounds and mixtures thereof can also be provided.
• a separating strip it has proven to be advantageous for a separating strip to be arranged on a side of the adhesive layer which faces away from the paper substrate. This also represents a way of preventing the tear strip from blocking or sticking to itself or to undesired areas of an associated packaging.
• the separating strip can, for example, be a separating film or a separating paper, for example silicone paper.
• An advantageous storage or an advantageous transport of the tear strip is achieved in a further embodiment that this rolled up on a spool with a preferably traversing winding and/or made up as a flat spool.
• a second aspect of the invention relates to a method for producing a tear strip for packaging, in which a layer system is produced by applying an adhesive layer to a first side of a paper substrate.
• improved tearing behavior is achieved in that the adhesive layer is produced at least in regions with an uneven surface structure with relative elevations and relative depressions.
• the tear strip After its production, the tear strip can be wound on spools with traversing winding, which allow a long running length of up to 40,000 m or more, typically 10,000 - 20,000 m. Alternatively, the tear strip can also be made up as a flat coil.
• the paper substrate is provided with an uneven surface structure before the application of the adhesive layer and/or that the uneven surface structure is produced in the adhesive layer.
• the uneven surface structure of the adhesive layer can be achieved in that the adhesive layer itself is applied correspondingly unevenly to a paper substrate with an at least regionally uniform surface.
• the paper substrate is initially provided with an uneven surface, at least in regions, after which the adhesive layer is applied evenly or unevenly to the paper substrate.
• a smooth paper substrate is usually easier to coat than a rough or structured one.
• the adhesive layer is applied to the paper substrate by means of an anilox roller, in particular a hatch roller.
• an anilox roller in particular a hatch roller.
• the local application volume of the adhesive layer can also be precisely controlled by a suitable choice of the cells or elevations of the anilox roller.
• the paper substrate is provided with a printed layer and/or with a separating layer on a second side.
• the optical appearance of the tear strip can be adjusted with the help of the printed layer.
• the tear strip can be provided with symbols or instructions for use.
• Printing can generally take place using gravure printing, flexographic printing, offset printing, laser printing, inkjet printing or another suitable printing process.
• the ink can be based on nitrocellulose (NC), polyurethane (PU), polyvinyl chloride (PVC), polyvinyl butyral (PVB) or other binders.
• the separating layer prevents the tear strip from sticking to itself, for example.
• the width of the tear strip can be adapted to different applications, whereby the tear strip can initially be produced with a multiple of this width, which facilitates the coating process or processes for forming the layer system.
• the tear strip preferably has a width of between 2 mm and 15 mm, in particular between 4 mm and 8 mm.
• a third aspect of the invention relates to packaging which comprises at least one tear strip which is designed according to the first aspect of the invention and/or is produced by means of a method according to the second aspect of the invention.
• the resulting advantages can be found in the descriptions of the first and second aspects of the invention, advantageous configurations of the first and second aspects of the invention being to be regarded as advantageous configurations of the third aspect of the invention.
• advantageous configurations of the third aspect of the invention are also to be regarded as advantageous configurations of the first and second aspects of the invention.
• the packaging can preferably be designed to be completely compostable or biodegradable.
• the package may include two or more tear strips.
• FIG. 1 shows a schematic cross section through a tear strip according to the invention
• FIG. 2 shows a schematic and sectional view of the tear strip according to the invention during the application of an adhesive layer
• Figure 3 is a schematic perspective view of a tear tape spool
• Figure 4 is a plan view of a package on which the tear strip is placed.
• Fig. 5 shows an enlarged representation of detail V shown in Fig. 4.
• Fig. 1 shows a schematic cross section through a tear strip 10 according to the invention.
• the tear strip 10 comprises a layer system 12, which in the present case comprises a paper substrate 14, an adhesive layer 16 arranged on a first side of the paper substrate 14 and a fundamentally optional layer on the second side of the Paper substrate 14 arranged release layer 18 has. It can be seen in the cross section that the adhesive layer 16 has an uneven surface structure with a wavy structure made up of relative elevations 20 and relative depressions 22 .
• the tear strip 10 shown is compostable and/or biodegradable.
• the paper substrate 14 is based on cellulose. However, other types of paper, for example paper based on PET fibers, can also be provided.
• the grammage of the paper substrate 14 is between 90 and 200 g/m 2 , for example 120 g/m 2 .
• the paper substrate 14 can be white or bleached or unbleached or colored. Provision can also be made for the paper substrate 14 to be printed on one or both sides.
• the paper substrate 14 has a high mechanical stability in the main extension direction H (see FIG. 2) or running direction of at least 75 N/15 mm, in particular at least 110 N/15 mm or more.
• the paper substrate 14 is smooth to allow for good coatability. In principle, however, provision can also be made for the paper substrate 14 to have a structured surface on its first and/or second side, to which the adhesive layer 16 and/or the separating layer 18 is applied. By embossing the paper substrate 14, a better anti-adhesion property of the non-adhesive, second side can often be achieved.
• the adhesive layer 16 is applied to the entire surface of the first side of the paper substrate 14, it also being possible, in principle, to only apply it to certain areas.
• Fig. 2 which shows a schematic and sectional top view of the tear strip 10 according to the invention during the application of the adhesive layer 16
• the structured surface of the adhesive layer 16 has a regular line or wave structure, which contains lines or waves formed by the elevations 20 Waves are formed as structural elements.
• the wave or line structure shown can be produced, for example, by means of a corresponding engraving of a coating cylinder, for example by means of a hatching roller.
• the line structure with the elevations 20 and depressions 22 is formed regularly since the lines are repeated periodically on the surface of the paper substrate 14 .
• Extension vector V of the periodicity of the line structure element is arranged obliquely to the main extension direction H of the paper substrate 14 .
• the lines or elevations 20 do not run perpendicularly or parallel to the main extension direction H, but rather run diagonally.
• other regular or irregular surface structures can also be produced.
• An adhesive based on polyacrylate, a natural or synthetic rubber or a sealing wax can be used for the adhesive layer 16 .
• the application of adhesive is typically in the range between 15 and 60 g/m 2 , in particular 20 to 30 g/m 2 .
• the separating layer 18 can likewise be applied to the entire surface or only to specific surface areas of the paper substrate 14 .
• the separating layer 18 is typically silicone-based, but in general other separating agents, for example based on polyacrylate, carbamate or polyvinyl ether wax, can also be used.
• the coating weight of the separating layer 18 is normally in the range between 0.1 and 2.0 g/m 2 , in particular between 0.2 and 1.0 g/m 2 .
• the separating layer 18 can be dispensed with and instead the adhesive layer 16 can be covered with a separating film (not shown) or a separating paper, for example silicone paper.
• the paper substrate 14 can be printed, in particular on the non-adhesive side. If a release liner 18 is provided, printing is preferably done directly on the paper substrate 14 prior to coating with the release liner 18. Printing may be by rotogravure, flexographic, offset, or other printing methods. The ink can be based on NC, PU, PVC, PVB or other binders. Optionally between the Printing layer and the separating layer 18 an additional lacquer coating (not shown) are applied. In this case, the layer structure of the layer system 12 would be adhesive layer 16-paper substrate 14-printing layer-varnish layer-separating layer 18.
• FIG. 3 shows a schematic perspective view of a tear-off strip spool 26.
• the tear-off strip 10 is wound onto a core 24 for this purpose.
• the tear-off strip 10 is preferably wound with traversing winding, as a result of which a long running length of up to 40,000 m, typically 10,000 to 20,000 m, is made possible.
• the tear strip 10 can also be made up as a flat coil.
• the tear strip 10 can be cut into narrower strips.
• the typical stripe width for the most common packages 28 is about 2 to 15 mm, in particular 4 to 8 mm. Cutting is typically done with scissors, but other types of cutting or separating are also possible.
• FIG. 4 shows a plan view of an unfolded package 28 on which another exemplary embodiment of the tear strip 10 according to the invention is arranged.
• FIG. 4 is explained in conjunction with FIG. 5, which shows an enlarged representation of detail V.
• FIG. It can be seen in particular in FIG. 5 that the adhesive layer 16 in the present case has a regular dot pattern of punctiform elevations 20 and corresponding depressions 22 .

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wrappers (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=83081988

Family Applications (1)

Country Status (6)

Family Cites Families (8)

• 2021
  • 2021-07-26 DE DE102021119281.1A patent/DE102021119281A1/de active Pending
• 2022
  • 2022-07-26 KR KR1020247005454A patent/KR20240040763A/ko unknown
  • 2022-07-26 CA CA3227170A patent/CA3227170A1/en active Pending
  • 2022-07-26 WO PCT/EP2022/071009 patent/WO2023006786A1/de active Application Filing
  • 2022-07-26 EP EP22760662.1A patent/EP4377218A1/de active Pending
  • 2022-07-26 CN CN202280057775.5A patent/CN118055887A/zh active Pending

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