US20030148132A1 - Recyclable label foil - Google Patents
Recyclable label foil Download PDFInfo
- Publication number
- US20030148132A1 US20030148132A1 US09/471,433 US47143399A US2003148132A1 US 20030148132 A1 US20030148132 A1 US 20030148132A1 US 47143399 A US47143399 A US 47143399A US 2003148132 A1 US2003148132 A1 US 2003148132A1
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- US
- United States
- Prior art keywords
- label foil
- foil
- core layer
- top layers
- layer
- 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.)
- Abandoned
Links
- 239000011888 foil Substances 0.000 title claims abstract description 68
- 239000010410 layer Substances 0.000 claims abstract description 63
- 239000012792 core layer Substances 0.000 claims abstract description 32
- -1 polyethylene Polymers 0.000 claims abstract description 23
- 239000004698 Polyethylene Substances 0.000 claims abstract description 13
- 229920000573 polyethylene Polymers 0.000 claims abstract description 12
- 238000002372 labelling Methods 0.000 claims abstract description 10
- 239000004743 Polypropylene Substances 0.000 claims description 10
- 229920001155 polypropylene Polymers 0.000 claims description 9
- 229920001684 low density polyethylene Polymers 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 7
- 229920002994 synthetic fiber Polymers 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 5
- 239000000454 talc Substances 0.000 claims description 5
- 229910052623 talc Inorganic materials 0.000 claims description 5
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 229920001903 high density polyethylene Polymers 0.000 claims description 4
- 239000004700 high-density polyethylene Substances 0.000 claims description 4
- 239000004702 low-density polyethylene Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 239000012764 mineral filler Substances 0.000 claims description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 2
- 239000005977 Ethylene Substances 0.000 claims description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 2
- 229920001038 ethylene copolymer Polymers 0.000 claims description 2
- 238000010101 extrusion blow moulding Methods 0.000 claims description 2
- 239000012968 metallocene catalyst Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229920001897 terpolymer Polymers 0.000 claims description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 abstract description 11
- 239000012790 adhesive layer Substances 0.000 description 4
- 238000004040 coloring Methods 0.000 description 4
- 229920000098 polyolefin Polymers 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 2
- RZXDTJIXPSCHCI-UHFFFAOYSA-N hexa-1,5-diene-2,5-diol Chemical compound OC(=C)CCC(O)=C RZXDTJIXPSCHCI-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000005026 oriented polypropylene Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/04—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps to be fastened or secured by the material of the label itself, e.g. by thermo-adhesion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/70—Scrap or recycled material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/08—Dimensions, e.g. volume
- B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
- B32B2309/105—Thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
- B32B2323/043—HDPE, i.e. high density polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/10—Polypropylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2519/00—Labels, badges
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
- Y10S264/911—Recycling consumer used articles or products
- Y10S264/918—From hollow- or container-type articles, e.g. tubes, bottles, cups
-
- 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
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
-
- 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
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
-
- 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
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31938—Polymer of monoethylenically unsaturated hydrocarbon
Definitions
- the invention relates to a recyclable label foil.
- label foils made of mono- or bi-axially oriented polyesters or oriented polypropylene (OPP).
- the label foil is printed and bonded to a release liner that is provided with an adhesive layer.
- the entire composite consisting of release liner, adhesive layer and label foil is cut and the excess is taken up as a cut grid.
- it is important that the foil has a good cutability. A series of separate foil sections remains on the release liner.
- the release liner is redirected with a small bending radius in a large angle whereby the label section is released from the release liner.
- the release liner is redirected with a small bending radius and a large angle, whereby the label section is released from the release liner.
- the stiffness of the label section is large enough such that the part of the label section that is already released from the release liner can be pushed in a “free-floating” manner to the contact point at the object to be labeled without bending away from the desired path.
- the principal objective of the present invention to provide a cost-efficient label foil that exhibits a high stiffness such that good processability in labeling devices is ensured.
- the label foil shall have good cutability such that clean cutting edges occur at the cut label section. The recylability of the label foil must be ensured; if possible, the applied label foil shall be recyclable together with the packaging.
- one first top layer made of polyethylene
- one second top layer made of polyethylene
- top layers each have about the same thickness and where the core layer has about 5 times to 20 times the respective thickness of one top layer.
- An advantage of the label foil subject to the invention is that it is manufactured exclusively of polyolefines, that is, of inexpensive mass synthetics that are also used to manufacture most of the packages for goods of daily consumption.
- Polyethylene and polypropylene have a good mixability and a good reusability as a mixed recycled product.
- the symmetric design prevents a tendency of the label foil to roll during processing such that the label foil is in plain contact during processing.
- the synthetic materials of the top and core layers can be coextruded as a blow or cast foil because of the good compatibility of the polyolefines PE and PP.
- the core layer which is made of polypropylene and has a significantly greater thickness when compared to the top layers, a high stiffness of the label foil is achieved. Orienting of the foil is no longer required, which results in the possibility of significant cost reductions.
- the cutting dies experience a high resistance because of the thick core layer of polypropylene such that a clean cut is obtained at the cutting line. A plastic deformation of the synthetic material in the area of the cut, which would lead to fraying, is avoided.
- the invention also relates to a recyclable label foil that is suitable for In-mold Labeling (IML) of synthetic containers that are produced by extrusion blow molding.
- IML label foil with at least three co-extruded layers is known from the German Patent No. DE 43 06 103 A1, where the at least one core layer is located between two top layers and where at least one of the top layers consists of a sealable synthetic material that softens at or below the temperature of the blow mold. Either the seal layer or the core layer is foamed, which allows for better compensation of the heat tensions within the label, such that optical error spots such as wrinkles or bubbles can be largely avoided with the labels that are attached to the container. Because of the exclusive use of polyolefines in the laminate structure, the labels are well suited for recycling.
- the top layer is made of polyethylene and the core layer is made of polypropylene, and
- both top layers have about the same thickness and the core layer has a thickness that is about 5 times to 20 times that of one top layer.
- the layer design and the thickness ratio of the layers are significant to the invention.
- an improvement is also realized in the properties at increased temperatures.
- the symmetric design avoids the tendency of warping and rolling during temperature changes.
- the thick core layer can obtain significantly more heat than the relatively low amount of heat that is transferred when melting on the seal layer.
- the section of the label foil must, with the processing steps described above, contact the inside of the blow form plainly, and since generally cylindrical or otherwise rounded containers are labeled with the in-mold labeling method, the outer area of the label section must be stretched and the inner area, which is to be applied to the container, must be compressed.
- the fact that the top layers are thin and soften at relatively low temperatures that correspond approximately to the tool wall temperature of the blow mold aids in this regard, such that a plastic deformation of the top layers, and thus, an adjustment of the shape of the label section, is made possible in the blow mold.
- the thick core remains stable in its shape.
- the invention provides top layers that seal at low temperatures.
- the synthetic material of the top coating has a flow behavior that is characterized by a melt flow index MFI (German Industry Standard—DIN 53735, 190° C./2.16 kg test conditions) of 5 to 30 g/10 min. preferably of 10 to 20 g/10 min.
- the top coatings can, preferably, be made of:
- PE-LD low density polyethylene
- PE-LLD low density linear polyethylene polymerized with metallocene catalysts
- PE-LD low density polyethylene
- PE-LLD low density linear polyethylene
- EVA ethylene vinyl acetate copolymer
- an ethylene copolymer or an ethylene terpolymer with a sealing temperature range from 60 to 85° C.
- a fill content of 5 to 40 percent in weight advantageously achieves a further improvement of the thermal and mechanical durability and at same time improves the economic aspect through material savings at the relatively thick core layer.
- the label foil is a five-layer co-extruded product, where a coextruded adhesion-supporting layer is located between each of the top layers and the core layer.
- FIG. 1 a shows a schematic presentation of a laminate of release liner, adhesive layer and label foil
- FIG. 1 b shows a schematic presentation of the label foil with attached labels after cutting and removing of the cutting grid
- FIG. 2 shows a schematic sectional view of a label foil according to the invention
- FIG. 3 shows another embodiment of a label foil in schematic sectional view as well
- FIG. 4 shows a schematic section through a blow mold tool with hollow body and in-mold label.
- FIG. 1 a shows a laminate for labeling of packaging, for example.
- a silicon compound acting as an anti-adhesion coating is applied to one of the top layers of the release layer 1 , and after hardening, an adhesion layer 2 is applied.
- This may be a melt adhesive or an adhesive that is available in an aqueous or solvent-containing dispersion, for example, ethylene vinyl alcohol (EVAc).
- EVAc ethylene vinyl alcohol
- An already printed label foil 3 is then laminated to the adhesion layer 2 .
- the label foil 3 is cut along the contour shown as a dashed line 5 resulting in label sections 4 being worked out of the label foil 3 .
- the cutting is carried out with cutting dies that penetrate at least the label foil 3 and the adhesive layer 2 .
- the area of the label foil 3 that is outside the label sections is removed as a connected cut grid, such that the result is a release liner 1 with numerous label sections 4 arranged in a row as shown in FIG. 1 b .
- This is fed to an automatic dispenser, where the label sections are released and applied to packaging or similar objects.
- the label foil 3 shown in FIG. 2 is manufactured as a three-layer co-extruded product as blow foil and exhibits the following characteristics:
- the top layers 3 . 1 , 3 . 3 are made of high density polyethylene (HDPE) with a density ⁇ of 0.930 to 0.960 g/cm 3 , a melt flow index MFI (DIN 53735, 190° C./2.16 kg test conditions) of 3 to 7 g/10 min. and have a thickness of 2 to 10 ⁇ m, preferably of 3 to 7 ⁇ m.
- HDPE high density polyethylene
- the core layer 3 . 2 is made of polypropylene with a melt flow index MFI (DIN 53735, 190° C./2.16 kg test conditions) of 0.2 to 4 g/10 min, preferably of 0.2 to 2 g/10 min.
- MFI melt flow index
- the label foil 3 exhibits an overall thickness of 40 to 80 ⁇ m, preferably of 50 to 70 ⁇ m.
- the melting point of the core layer 3 . 2 is greater than 155° C.
- FIG. 3 shows another embodiment of a label foil 3 .
- the core layer 3 . 2 is filled with mineral filler materials 6 such as chalk, lime or talc.
- the filler content is 2 to 20 percent in weight, preferably around 10 percent in weight.
- the preferred filler material is talc with a particle size of 2 to 20 ⁇ m, preferably a particle size of 2 to 5 ⁇ m. This adjusts the material of the core layer 3 . 2 to a greater brittleness, such that the cutability is improved and particularly clear cutting edges are achieved.
- the label foil 3 in this embodiment can be co-extruded as a five-layer laminate with adhesion-supporting layers 7 . 1 , 7 . 2 , resulting in the following layer sequence:
- the preferred thickness of the adhesion-supporting layers 7 . 1 , 7 . 2 is 5 to 8 ⁇ m.
- the label foil 3 subject to the invention in an additional embodiment is suited for in-mold labeling.
- FIG. 4 shows, an in-mold-label 3 is placed in a blow mold tool 10 that consists of two tool sections 11 , 12 .
- the tool sections 11 , 12 form a tool cavity 16 and are moved apart to retrieve the finished hollow body 20 .
- a hose-shaped softened mold blank that is closed on one side is lowered into the tool cavity 16 through an upper tool opening 14 and is expanded by feeding in blow air until the plastical formable wall of the mold blank contacts the wall of the tool, where it solidifies while forming a hollow body 20 .
- the mold blank contacts the easily sealable top layer 3 . 1 in the location where the in-mold-label is placed, and forms a solid bond with said sealable top layer by melting into each other, thus preventing label 3 from falling off of the finished hollow body 20 .
- Coloring of the label foil 3 is accomplished by adding pigments to at least one of the top and/or core layers 3 . 1 , 3 . 2 , 3 . 3 .
- white coloring pigments such as titanium oxide can be used inexpensively. Coloring has the result that the contrast of the printing is richer. It may also be possible to reduce the usage of printing dye by coloring the label foil 3 . With a small amount of pigment additives in the label foil 3 , an opaque foil with a respective optical effect can be created, particularly in combination with rear, transparent printing.
- the label foil of the invention distinguishes itself through a low tendency of rolling, good cutting behavior and high stiffness.
- the structure of standard polyolefines leads to a cost-effective label foil well suited for recycling.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Laminated Bodies (AREA)
Abstract
A label foil is disclosed that is suitable for in-mold labeling, has a high stiffness, is well suited for cutting and is recyclable. The top layers of the label foil are made of polyethylene. Both top layers have about the same thickness and the core layer has a thickness that is about 5 times to 20 times that of one top layer.
Description
- The invention relates to a recyclable label foil.
- According to the state-of-the-art, label foils made of mono- or bi-axially oriented polyesters or oriented polypropylene (OPP). The label foil is printed and bonded to a release liner that is provided with an adhesive layer. The entire composite consisting of release liner, adhesive layer and label foil is cut and the excess is taken up as a cut grid. For this purpose, it is important that the foil has a good cutability. A series of separate foil sections remains on the release liner.
- During dispensing, that is, during the application of the label on the container or similar object to be labeled, the release liner is redirected with a small bending radius in a large angle whereby the label section is released from the release liner. In front of the object to be labeled, the release liner is redirected with a small bending radius and a large angle, whereby the label section is released from the release liner. The stiffness of the label section is large enough such that the part of the label section that is already released from the release liner can be pushed in a “free-floating” manner to the contact point at the object to be labeled without bending away from the desired path.
- However, a disadvantage of known recyclable label foils is that a cost-intensive orienting of the starting material is absolutely essential to ensure a sufficient stiffness of the label section, and thus the problem-free application with automatic labeling devices. In addition, the synthetic materials suitable for the labels, in particular PET (polyethylene terephtalate), are relatively expensive.
- It is, therefore, the principal objective of the present invention to provide a cost-efficient label foil that exhibits a high stiffness such that good processability in labeling devices is ensured. In addition, the label foil shall have good cutability such that clean cutting edges occur at the cut label section. The recylability of the label foil must be ensured; if possible, the applied label foil shall be recyclable together with the packaging.
- According to the invention, this objective mentioned above is accomplished with a recyclable label foil with at least
- one first top layer made of polyethylene,
- one core layer made of polypropylene,
- one second top layer made of polyethylene,
- where the top layers each have about the same thickness and where the core layer has about 5 times to 20 times the respective thickness of one top layer.
- An advantage of the label foil subject to the invention is that it is manufactured exclusively of polyolefines, that is, of inexpensive mass synthetics that are also used to manufacture most of the packages for goods of daily consumption. Polyethylene and polypropylene have a good mixability and a good reusability as a mixed recycled product. The symmetric design prevents a tendency of the label foil to roll during processing such that the label foil is in plain contact during processing. It is further advantageous that the synthetic materials of the top and core layers can be coextruded as a blow or cast foil because of the good compatibility of the polyolefines PE and PP. Due to the core layer, which is made of polypropylene and has a significantly greater thickness when compared to the top layers, a high stiffness of the label foil is achieved. Orienting of the foil is no longer required, which results in the possibility of significant cost reductions. In addition, the cutting dies experience a high resistance because of the thick core layer of polypropylene such that a clean cut is obtained at the cutting line. A plastic deformation of the synthetic material in the area of the cut, which would lead to fraying, is avoided.
- The invention also relates to a recyclable label foil that is suitable for In-mold Labeling (IML) of synthetic containers that are produced by extrusion blow molding. A recyclable IML label foil with at least three co-extruded layers is known from the German Patent No. DE 43 06 103 A1, where the at least one core layer is located between two top layers and where at least one of the top layers consists of a sealable synthetic material that softens at or below the temperature of the blow mold. Either the seal layer or the core layer is foamed, which allows for better compensation of the heat tensions within the label, such that optical error spots such as wrinkles or bubbles can be largely avoided with the labels that are attached to the container. Because of the exclusive use of polyolefines in the laminate structure, the labels are well suited for recycling.
- However, it has been found that the stiffness of such a foil is not sufficient for secure handling by a machine, such that sections of the label snap off, get stuck in the transport paths and thus cause interruptions in the operating process. Additionally, changes in the thickness of the foamed layer of the label can be observed that are the result of pressure effects prior to the application (e.g., during printing) and/or of heat effects when applying the label during blow molding. This results in an uneven surface on the printed visible side, which optically, is hardly attractive. Furthermore, the application of foamed layers requires additional plant investments and processing steps for the production.
- It is, therefore, a further objective of the present invention to create an inexpensive, recyclable label foil that is suitable for in-mold labeling, has a high stiffness, is well suited for cutting and is recyclable. The aforementioned disadvantages of known IML label foil should be avoided.
- This objective is achieved with a label foil that is suitable for in-mold labeling of the kind mentioned above that is characterized
- in that the top layer is made of polyethylene and the core layer is made of polypropylene, and
- in that both top layers have about the same thickness and the core layer has a thickness that is about 5 times to 20 times that of one top layer.
- Significant to the invention is the layer design and the thickness ratio of the layers. In addition to the improvement in the suitability for machine handling due to the high stiffness of the thick core layer, an improvement is also realized in the properties at increased temperatures. The symmetric design avoids the tendency of warping and rolling during temperature changes. The thick core layer can obtain significantly more heat than the relatively low amount of heat that is transferred when melting on the seal layer. Regardless of the high stiffness, the section of the label foil must, with the processing steps described above, contact the inside of the blow form plainly, and since generally cylindrical or otherwise rounded containers are labeled with the in-mold labeling method, the outer area of the label section must be stretched and the inner area, which is to be applied to the container, must be compressed. With the label foils subject to the invention, the fact that the top layers are thin and soften at relatively low temperatures that correspond approximately to the tool wall temperature of the blow mold aids in this regard, such that a plastic deformation of the top layers, and thus, an adjustment of the shape of the label section, is made possible in the blow mold. However, the thick core remains stable in its shape.
- Sealing to the container is accomplished without an additional adhesive. Rather, the invention provides top layers that seal at low temperatures. In a preferred embodiment, the synthetic material of the top coating has a flow behavior that is characterized by a melt flow index MFI (German Industry Standard—DIN 53735, 190° C./2.16 kg test conditions) of 5 to 30 g/10 min. preferably of 10 to 20 g/10 min.
- With a recyclable label foil that is stiff in the delivery condition, the suitability for sealing is achieved through various designs of the top coatings. The top coatings can, preferably, be made of:
- low density polyethylene (PE-LD) with a density of 0.915 to 0.920 g/cm3,
- low density linear polyethylene polymerized with metallocene catalysts (PE-LLD) with a density of 0.915 to 0.985 g/cm3,
- a mixture of low density polyethylene (PE-LD) with a density of 0.915 to 0.985 g/cm3 and low density linear polyethylene (PE-LLD) with a density of 0.935 to 0.985 g/cm3,
- an ethylene vinyl acetate copolymer (EVA) with a vinyl acetate content of 25 to 40 percent in weight,
- an ethylene copolymer or an ethylene terpolymer with a sealing temperature range from 60 to 85° C.
- It is also possible to fill the core layer with mineral filler materials such as chalk, lime or talc. A fill content of 5 to 40 percent in weight advantageously achieves a further improvement of the thermal and mechanical durability and at same time improves the economic aspect through material savings at the relatively thick core layer.
- To achieve a good bond between the individual layers of the label foil, especially with a high filler material content of the core layer, an embodiment is advantageous, where the label foil is a five-layer co-extruded product, where a coextruded adhesion-supporting layer is located between each of the top layers and the core layer.
- The invention will become more readily apparent from the following description of exemplary embodiments and the drawings, wherein
- FIG. 1a shows a schematic presentation of a laminate of release liner, adhesive layer and label foil,
- FIG. 1b shows a schematic presentation of the label foil with attached labels after cutting and removing of the cutting grid,
- FIG. 2 shows a schematic sectional view of a label foil according to the invention,
- FIG. 3 shows another embodiment of a label foil in schematic sectional view as well, and
- FIG. 4 shows a schematic section through a blow mold tool with hollow body and in-mold label.
- FIG. 1a shows a laminate for labeling of packaging, for example. A silicon compound acting as an anti-adhesion coating is applied to one of the top layers of the
release layer 1, and after hardening, anadhesion layer 2 is applied. This may be a melt adhesive or an adhesive that is available in an aqueous or solvent-containing dispersion, for example, ethylene vinyl alcohol (EVAc). An already printedlabel foil 3 is then laminated to theadhesion layer 2. Thelabel foil 3 is cut along the contour shown as a dashedline 5 resulting inlabel sections 4 being worked out of thelabel foil 3. The cutting is carried out with cutting dies that penetrate at least thelabel foil 3 and theadhesive layer 2. The area of thelabel foil 3 that is outside the label sections is removed as a connected cut grid, such that the result is arelease liner 1 withnumerous label sections 4 arranged in a row as shown in FIG. 1b. This is fed to an automatic dispenser, where the label sections are released and applied to packaging or similar objects. - The
label foil 3 shown in FIG. 2 is manufactured as a three-layer co-extruded product as blow foil and exhibits the following characteristics: - The top layers3.1, 3.3 are made of high density polyethylene (HDPE) with a density ρ of 0.930 to 0.960 g/cm3, a melt flow index MFI (DIN 53735, 190° C./2.16 kg test conditions) of 3 to 7 g/10 min. and have a thickness of 2 to 10 μm, preferably of 3 to 7 μm.
- The core layer3.2 is made of polypropylene with a melt flow index MFI (DIN 53735, 190° C./2.16 kg test conditions) of 0.2 to 4 g/10 min, preferably of 0.2 to 2 g/10 min.
- The
label foil 3 exhibits an overall thickness of 40 to 80 μm, preferably of 50 to 70 μm. - The melting point of the core layer3.2 is greater than 155° C.
- FIG. 3 shows another embodiment of a
label foil 3. With this foil, the core layer 3.2 is filled with mineral filler materials 6 such as chalk, lime or talc. The filler content is 2 to 20 percent in weight, preferably around 10 percent in weight. The preferred filler material is talc with a particle size of 2 to 20 μm, preferably a particle size of 2 to 5 μm. This adjusts the material of the core layer 3.2 to a greater brittleness, such that the cutability is improved and particularly clear cutting edges are achieved. - To strengthen the inner bond between the top layers3.1, 3.3 and the core layer 3.2, the
label foil 3 in this embodiment can be co-extruded as a five-layer laminate with adhesion-supporting layers 7.1, 7.2, resulting in the following layer sequence: - a first top layer3.1
- a first adhesion-supporting layer7.1
- a core layer3.2
- a second adhesion-supporting layer7.2
- a second top layer3.3
- Here, the preferred thickness of the adhesion-supporting layers7.1, 7.2 is 5 to 8 μm.
- The
label foil 3 subject to the invention in an additional embodiment is suited for in-mold labeling. - As FIG. 4 shows, an in-mold-
label 3 is placed in ablow mold tool 10 that consists of twotool sections tool sections tool cavity 16 and are moved apart to retrieve the finishedhollow body 20. - A hose-shaped softened mold blank that is closed on one side is lowered into the
tool cavity 16 through anupper tool opening 14 and is expanded by feeding in blow air until the plastical formable wall of the mold blank contacts the wall of the tool, where it solidifies while forming ahollow body 20. In this process, the mold blank contacts the easily sealable top layer 3.1 in the location where the in-mold-label is placed, and forms a solid bond with said sealable top layer by melting into each other, thus preventinglabel 3 from falling off of the finishedhollow body 20. - Coloring of the
label foil 3 is accomplished by adding pigments to at least one of the top and/or core layers 3.1, 3.2, 3.3. For example, white coloring pigments such as titanium oxide can be used inexpensively. Coloring has the result that the contrast of the printing is richer. It may also be possible to reduce the usage of printing dye by coloring thelabel foil 3. With a small amount of pigment additives in thelabel foil 3, an opaque foil with a respective optical effect can be created, particularly in combination with rear, transparent printing. - In processing, the label foil of the invention distinguishes itself through a low tendency of rolling, good cutting behavior and high stiffness. The structure of standard polyolefines leads to a cost-effective label foil well suited for recycling.
Claims (12)
1. Recyclable label foil (3) with at least
one first top layer (3.1) made of polyethylene,
one core layer (3.2) made of polypropylene, and
one second top layer (3.3) made of polyethylene,
where the top layers (3.1, 3.3) each have about the same thickness and where the core layer (3.2) has about 5 times to 20 times the respective thickness of one top layer (3.1, 3.3).
2. Recyclable label foil (3) as set forth in claim 1 , characterized in that
the top layers (3.1, 3.3) are made of high density polyethylene (HDPE) with a density p of 0.930 to 0.960 g/cm3 and a melt flow index MFI (DIN 53735, 190° C./2.16 kg test conditions) of 3 to 7 g/10 min. and have a thickness of 2 to 10 μm, preferably of 3 to 7 μm,
the core layer (3.2) is made of polypropylene with a melt flow index MFI (DIN 53735, 190° C./2.16 kg test conditions) of 0.2 to 4 g/10 min, preferably of 0.2 to 2 g/10 min.
the label foil (3) exhibits an overall thickness of 40 to 80 μm, preferably of 50 to 70 μm, and
the melting point of the core layer (3.2) is greater than 155° C.
3. Recyclable label foil (3) for in-mold labeling of synthetic containers to be produced by extrusion blow molding, with at least three co-extruded layers, where at least one core layer is located between two top layers and where at least one of the top layers consists of a sealable synthetic material that softens at or below the temperature of the blow mold, characterized in that
the top coatings (3.1, 3.3) are made of polyethylene and the core layer (3.2) of polypropylene, and
the two top layers (3.1, 3.3) each have about the same thickness and in that the core layer (3.2) has about 5 times to 20 times the respective thickness of one top layer (3.1, 3.3).
4. Recyclable label foil as set forth in claim 3 , characterized in that the synthetic material of the top layers (3.1, 3.3) exhibits a melt flow index MFI (DIN 53735, 190° C./2.16 kg test conditions) of 5 to 30 g/10 min., preferably of 10 to 20 g/10 min.
5. Recyclable label foil as set forth in claim 3 or 4, characterized in that the top layers (3.1, 3.3) are made of low density polyethylene (PE-LD) with a density of 0.915 to 0.920 g/cm3.
6. Recyclable label foil as set forth in claim 3 or 4, characterized in that the top layers (3.1, 3.3) are made of low density linear polyethylene polymerized with metallocene catalysts (PE-LLD) with a density of 0.915 to 0.985 g/cm3.
7. Recyclable label foil as set forth in claim 3 or 4, characterized in that the top layers (3.1, 3.3) are made of a mixture of low density polyethylene (PE-LD) with a density of 0.915 to 0.985 g/cm3 and low density linear polyethylene (PE-LLD) with a density of 0.935 to 0.985 g/cm3.
8. Recyclable label foil as set forth in claim 3 or 4, characterized in that the top layers (3.1, 3.3) are made of an ethylene vinyl acetate copolymer (EVA) with a vinyl acetate content of 25 to 40 percent in weight.
9. Recyclable label foil as set forth in claim 3 or 4, characterized in that the top layers (3.1, 3.3) are made of an ethylene copolymer or an ethylene terpolymer with a sealing temperature range from 60 to 85° C.
10. Recyclable label foil (3) as set forth in one of the aforementioned claims, characterized in that at least the core layer (3.2) is filled with mineral filler materials such as chalk, lime, titanium oxide or talc with a fill content of 5 to 40 percent in weight.
11. Recyclable label foil (3) as set forth in one of the aforementioned claims, characterized in that the filler material is talc with an average particle size of 2 to 20 μm, preferably with a particle size of 2 to 5 μm.
12. Recyclable label foil (3) as set forth in one of the aforementioned claims, characterized in that the label foil (3) is a five-layer co-extruded product, where a coextruded adhesion-supporting layer (7.1, 7.2) with a thickness of 5 to 8 μm is located between each of the top layers (3.1, 3.3) and the core layer (3.2).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/636,667 US7186366B2 (en) | 1998-12-23 | 2003-08-06 | Recyclable label foil |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19859789.423 | 1998-12-23 | ||
DE19859789A DE19859789C1 (en) | 1998-12-23 | 1998-12-23 | Recyclable label film consists of a polypropylene core layer arranged between two polyethylene cover layers |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/636,667 Division US7186366B2 (en) | 1998-12-23 | 2003-08-06 | Recyclable label foil |
Publications (1)
Publication Number | Publication Date |
---|---|
US20030148132A1 true US20030148132A1 (en) | 2003-08-07 |
Family
ID=7892485
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/471,433 Abandoned US20030148132A1 (en) | 1998-12-23 | 1999-12-22 | Recyclable label foil |
US10/636,667 Expired - Fee Related US7186366B2 (en) | 1998-12-23 | 2003-08-06 | Recyclable label foil |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/636,667 Expired - Fee Related US7186366B2 (en) | 1998-12-23 | 2003-08-06 | Recyclable label foil |
Country Status (2)
Country | Link |
---|---|
US (2) | US20030148132A1 (en) |
DE (1) | DE19859789C1 (en) |
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WO2006002806A1 (en) * | 2004-07-01 | 2006-01-12 | Unilever N.V. | Laminate |
EP1813423A1 (en) * | 2006-01-27 | 2007-08-01 | RKW AG Rheinische Kunststoffwerke | Transparent, stiff and printable polypropylene blown films |
US20080206505A1 (en) * | 2006-06-20 | 2008-08-28 | Blackwell Christopher J | Multilayered Polymeric Film for Hot Melt Adhesive Labeling and Label Stock and Label Thereof |
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WO2018182026A1 (en) * | 2017-03-31 | 2018-10-04 | 株式会社ユポ・コーポレーション | Label for in-mold molding and labeled resin molded article |
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-
1998
- 1998-12-23 DE DE19859789A patent/DE19859789C1/en not_active Expired - Lifetime
-
1999
- 1999-12-22 US US09/471,433 patent/US20030148132A1/en not_active Abandoned
-
2003
- 2003-08-06 US US10/636,667 patent/US7186366B2/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
US7186366B2 (en) | 2007-03-06 |
DE19859789C1 (en) | 2000-06-08 |
US20040056389A1 (en) | 2004-03-25 |
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Legal Events
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Owner name: M & W VERPACKUNGEN GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SCHWINN, GEORG;REEL/FRAME:010503/0976 Effective date: 19991217 |
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Owner name: NORDENIA DEUTSCHLAND GRONAU GMBH, GERMANY Free format text: CHANGE OF NAME;ASSIGNOR:M & W VERPACKUNGEN GMBH;REEL/FRAME:013799/0179 Effective date: 20020715 |
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