WO2024038332A1 - Paperboard-based disposable cup arranged with an interior layer with a low pps-value - Google Patents
Paperboard-based disposable cup arranged with an interior layer with a low pps-value Download PDFInfo
- Publication number
- WO2024038332A1 WO2024038332A1 PCT/IB2023/057176 IB2023057176W WO2024038332A1 WO 2024038332 A1 WO2024038332 A1 WO 2024038332A1 IB 2023057176 W IB2023057176 W IB 2023057176W WO 2024038332 A1 WO2024038332 A1 WO 2024038332A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- paperboard
- disposable cup
- pigment
- coating layer
- based disposable
- Prior art date
Links
- 239000011087 paperboard Substances 0.000 title claims abstract description 114
- 239000000049 pigment Substances 0.000 claims abstract description 60
- 239000011247 coating layer Substances 0.000 claims abstract description 59
- 229920000642 polymer Polymers 0.000 claims abstract description 40
- 239000010410 layer Substances 0.000 claims description 43
- 239000000758 substrate Substances 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 24
- 239000011230 binding agent Substances 0.000 claims description 20
- 239000006185 dispersion Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 12
- 239000004816 latex Substances 0.000 claims description 11
- 229920000126 latex Polymers 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 241000276425 Xiphophorus maculatus Species 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 6
- 239000000454 talc Substances 0.000 claims description 6
- 229910052623 talc Inorganic materials 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims description 5
- 239000005995 Aluminium silicate Substances 0.000 claims description 4
- 235000012211 aluminium silicate Nutrition 0.000 claims description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000011115 styrene butadiene Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 description 38
- 239000011248 coating agent Substances 0.000 description 29
- 235000013405 beer Nutrition 0.000 description 28
- -1 polyethylene Polymers 0.000 description 25
- 229920003023 plastic Polymers 0.000 description 12
- 239000004033 plastic Substances 0.000 description 12
- 239000004698 Polyethylene Substances 0.000 description 11
- 229920000573 polyethylene Polymers 0.000 description 11
- 238000007765 extrusion coating Methods 0.000 description 9
- 239000006260 foam Substances 0.000 description 9
- 238000005187 foaming Methods 0.000 description 9
- 239000004743 Polypropylene Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 229920001155 polypropylene Polymers 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- 238000004806 packaging method and process Methods 0.000 description 6
- 239000005014 poly(hydroxyalkanoate) Substances 0.000 description 6
- 229920000903 polyhydroxyalkanoate Polymers 0.000 description 6
- 239000002655 kraft paper Substances 0.000 description 5
- 229920000954 Polyglycolide Polymers 0.000 description 4
- 229920000331 Polyhydroxybutyrate Polymers 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000007756 gravure coating Methods 0.000 description 4
- 229920001684 low density polyethylene Polymers 0.000 description 4
- 239000004702 low-density polyethylene Substances 0.000 description 4
- 239000005015 poly(hydroxybutyrate) Substances 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229920002472 Starch Polymers 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 235000013361 beverage Nutrition 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000004626 polylactic acid Substances 0.000 description 3
- 239000008107 starch Substances 0.000 description 3
- 235000019698 starch Nutrition 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 229920008262 Thermoplastic starch Polymers 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229920002301 cellulose acetate Polymers 0.000 description 2
- 238000007766 curtain coating Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 239000004629 polybutylene adipate terephthalate Substances 0.000 description 2
- 239000004631 polybutylene succinate Substances 0.000 description 2
- 229920002961 polybutylene succinate Polymers 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920001610 polycaprolactone Polymers 0.000 description 2
- 239000004632 polycaprolactone Substances 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004628 starch-based polymer Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- NJVOHKFLBKQLIZ-UHFFFAOYSA-N (2-ethenylphenyl) prop-2-enoate Chemical compound C=CC(=O)OC1=CC=CC=C1C=C NJVOHKFLBKQLIZ-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 229920000571 Nylon 11 Polymers 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920000305 Nylon 6,10 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012793 heat-sealing layer Substances 0.000 description 1
- 235000015095 lager Nutrition 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000004633 polyglycolic acid Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000013074 reference sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000003232 water-soluble binding agent Substances 0.000 description 1
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
- B32B27/10—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 paper or cardboard
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/826—Paper comprising more than one coating superposed two superposed coatings, the first applied being pigmented and the second applied being non-pigmented
-
- 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
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
-
- 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
- B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
- B65D3/02—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape
- B65D3/06—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape essentially conical or frusto-conical
Definitions
- the present disclosure relates to paperboard-based disposable cups. More specifically, the present disclosure relates to paperboard-based disposable beverage cups suitable for serving beer.
- Coating of paper and paperboard with plastics is often employed to combine the mechanical properties of the paperboard with the barrier and sealing properties of a plastic film.
- Paperboard provided with even a relatively small amount of a suitable plastic material can provide the properties needed to make the paperboard suitable for many demanding applications, for example as liquid or food packaging board.
- polyolefin coatings are frequently used as liquid barrier layers, heat sealing layers and adhesives.
- a paperboard-based disposable cup said paperboard-based disposable cup being formed of a paperboard-based laminate, wherein a first side of the paperboard-based laminate forming an inside surface of the paperboard-based disposable cup comprises a pigment coating layer having a grammage in the range of 10-20 g/m 2 and an outermost polymer coating layer having a grammage in the range of 5-25 g/m 2 , wherein the inside surface of the paperboard-based disposable cup has a PPS surface smoothness ⁇ 3 pm as determined according to ISO 8791-4:2007.
- the surface energy of board was found to had very little effect on foam formation.
- the smoothness of the inside surface of the cup was found to be the key factor influencing the foam formation.
- the present invention is based on the understanding that by providing a pigment coating layer underneath the outermost polymer coating layer forming the inside surface of the cup, a very smooth surface of the inside surface can be obtained.
- the smooth surface having a PPS surface smoothness ⁇ 3 pm as determined according to ISO 8791-4:2007, has been found to significantly reduce the foaming tendency of beer served in the cup.
- Paperboard generally refers to strong, thick paper or cardboard comprising cellulose fibers used for boxes and other types of packaging. Paperboard can either be bleached or unbleached, coated or uncoated, and produced in a variety of thicknesses, depending on the end use requirements.
- the paperboard substrate used in the inventive method typically has a grammage of at least 100 g/m 2 and a density in the range of below 600-1000 kg/m 3 . Unless otherwise stated, the grammage is determined according to the standard ISO 536. Unless otherwise stated, the density is determined according to the standard ISO 534.
- the paperboard-based laminate of the paperboardbased disposable cup comprises a paperboard substrate having a grammage in the range of 150-400 g/m 2 .
- the paperboard substrate has a bulk > 1.1 m 3 /kg, preferably > 1.2 m 3 /kg, and more preferably > 1.3 m 3 /kg, as determined according to ISO 534.
- the paperboard may be a single ply material, or a multi-ply material comprised of two or more plies.
- the paperboard substrate is a multi-ply paperboard. In some embodiments the paperboard substrate is a multi-ply paperboard comprised of two or more plies. In some embodiments the paperboard substrate is a multi-ply paperboard comprised of three or more plies.
- a common type of multi-ply paperboard is comprised of a lower density mid-ply (also sometimes referred to as “bulk ply”) sandwiched between two higher density outer plies.
- the lower density mid-ply may typically have a density below 750 kg/m 3 , preferably below 700, below 650, below 600, below 550, below 500, below 450, below 400 or below 350 kg/m 3 .
- the higher density outer plies typically have a density at least 100 kg/m 3 higher than the mid-ply, preferably at least 200 kg/m 3 higher than the mid-ply.
- the paperboard substrate typically comprises kraft pulp.
- the paperboard substrate consists of kraft pulp.
- the paperboard substrate consists of a mixture of kraft pulp and chemi- thermomechanical (CTMP) or other mechanical pulps.
- CTMP chemi- thermomechanical
- the outer plies may preferably consist of kraft pulp and the mid-ply may preferably consist of a mixture of kraft pulp and chemi-thermomechanical (CTMP) or other mechanical pulps.
- the paperboard substrate may typically have a relatively rough surface.
- the paperboard substrate has a PPS (Parker Print-Surf) surface smoothness > 3 pm, typically > 5 pm, as determined according to ISO 8791-4:2007.
- PPS Parker Print-Surf
- a paperboard-based laminate is a packaging material formed mainly from a paperboard substrate.
- the paperboardbased laminate comprises additional layers or coatings designed to improve the performance and/or appearance of the laminate.
- the paperboard substrate of the paperboard-based disposable cup is provided on a first side thereof facing the inside of the cup with a pigment coating layer.
- a pigment coating is a coating comprising at least one pigment and at least one binder.
- the pigment and binder are typically applied to the surface of the paperboard substrate in the form of a liquid, preferably aqueous, dispersion, and subsequently dried to obtain the pigment coating layer.
- the grammage of the pigment coating layer is in the range of 10-20 g/m 2 . In some embodiments, the pigment coating layer has a grammage in the range of 13-15 g/m 2 .
- the pigment coating layer comprises at least one pigment and at least one binder. In some embodiments, the pigment coating layer comprises 60-70 wt% pigment and 20-30 wt% binder based on dry weight.
- the pigment comprises calcium carbonate and a platy pigment, preferably selected from the group consisting of kaolin, talc or a mixture thereof.
- the binder may comprise a single binder or a combination of binders.
- the binder may preferably comprise a water-dispersible or water-soluble binder, or a combination thereof.
- the binder is a latex, preferably selected from the group consisting of styrene acrylic (SA) latex, styrene butadiene (SB) latex, or a mixture thereof.
- SA styrene acrylic
- SB styrene butadiene
- the pigment coating layer may preferably be applied in at least two different coating steps with drying of the coated film between the steps.
- the pigment coating layer consists of two or more sub-layers.
- the pigment coating layer comprises a precoat layer formed on the paperboard substrate and a topcoat layer formed on the precoat layer.
- the precoat layer has a grammage in the range of 5-15 g/m 2 , preferably in the range of 6-12 g/m 2 .
- the precoat layer comprises 75-95 wt% pigment and 5-25 wt% binder, based on dry weight.
- the pigment in the precoat layer is calcium carbonate or a mixture of calcium carbonate and talc.
- the topcoat layer has a grammage in the range of 5-15 g/m 2 , preferably in the range of 6-9 g/m 2 .
- the topcoat layer comprises 20-50 wt% pigment and 50-80 wt% binder, based on dry weight.
- the pigment in the topcoat layer is platy pigment selected from the group consisting of kaolin, talc or a mixture thereof.
- the platy pigment in the topcoat layer has an aspect ratio above 10 and preferably above 20.
- the pigment coating layer may also be calendered, preferably in a soft calender or belt calender.
- the pigment coating layer has a PPS surface smoothness ⁇ 2 pm, preferably ⁇ 1.7 pm, and more preferably ⁇ 1.5 pm, as determined according to ISO 8791-4:2007.
- the paperboard-based laminate is further provided with an outermost polymer coating layer formed on the pigment coating layer.
- the outermost polymer coating layer preferably provides liquid barrier properties and mechanical protection for the paperboard-based laminate surface.
- the outermost polymer coating layer is preferably also heat-sealable.
- the outermost polymer coating layer is preferably applied onto the pigment coating layer by extrusion coating.
- Extrusion coating is a process by which a molten plastic material is applied to a substrate to form a very thin, smooth and uniform layer.
- the outermost polymer coating layer is an outermost extrusion coated polymer layer.
- the outermost polymer coating layer may comprise any of the thermoplastic polymers commonly used in protective and/or heat-sealable layers in paperboard- based packaging laminates in general or polymers used in liquid or food packaging board in particular.
- examples include polybutylene succinate (PBS), poly(butylene succinate-co-butylene adipate) (PBSA), polycaprolactone (PCL), poly(glycolic acid) (PGA), polyvinyl alcohol (PVOH), polybutylene adipate terephthalate (PBAT), polylactic acid (PLA), polyhydroxyalkanoates (PHA), polyhydroxybutyrate (PHB), starch, thermoplastic starch (TPS), cellulose acetate (CA), polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene furanoate (PEF), polypropylene (PP), polyamide 6 (PA6), polyamide 66 (PA
- Preferred examples include polyethylene (PE), polyethylene terephthalate (PET), polyethylene furanoate (PEF), polypropylene (PP), polyhydroxyalkanoates (PHA), polylactic acid (PLA), polyglycolic acid (PGA), polyvinyl alcohol (PVOH), and starch.
- PE polyethylene
- PET polyethylene terephthalate
- PEF polyethylene furanoate
- PP polypropylene
- PHA polyhydroxyalkanoates
- PPA polylactic acid
- PVA polyglycolic acid
- PVOH polyvinyl alcohol
- starch starch.
- Polyethylenes especially low density polyethylene (LDPE) and high density polyethylene (HDPE)
- LDPE low density polyethylene
- HDPE high density polyethylene
- the outermost polymer coating layer comprises polyethylene, preferably low-density polyethylene (LDPE).
- the polymers used are preferably manufactured from renewable materials.
- the outermost polymer coating layer is applied onto the pigment coating layer by liquid coating methods.
- the polymer is applied in the form of a dispersion, latex or solution of the of the polymer in a liquid carrier, and subsequently dried to form the outermost polymer coating layer.
- the outermost polymer coating layer applied by liquid coating methods may be applied by contact or non-contact coating methods. Examples of useful coating methods include, but are not limited to rod coating, curtain coating, film press coating, cast coating, transfer coating, size press coating, flexographic coating, gate roll coating, twin roll HSM coating, blade coating, such as short dwell time blade coating, jet applicator coating, spray coating, gravure coating or reverse gravure coating.
- the liquid dispersion is applied by blade coating.
- the polymer applied in the form of a dispersion, latex or solution of the of the polymer in a liquid carrier may for example be selected from the group consisting of a latex (e.g. styrene-acrylate (SA) latex, styrene-butadiene (SB) latex, or mixtures thereof), starch, carboxymethyl cellulose (CMC), polyolefins (e.g. polyethylene (PE), polypropylene (PP), or copolymers of polyethylene and polypropylene), polyhydroxyalkanoates (PHA), polyhydroxybutyrate (PHB), and polylactic acid (PLA).
- SA styrene-acrylate
- SB styrene-butadiene
- CMC carboxymethyl cellulose
- polyolefins e.g. polyethylene (PE), polypropylene (PP), or copolymers of polyethylene and polypropylene
- PHA polyhydroxyalkanoates
- PHB polyhydroxybuty
- the outermost polymer coating layer further comprises 1-20 wt% of a pigment, based on dry weight.
- the grammage of the outermost polymer coating layer is in the range of 5-25 g/m 2 . In some embodiments, the outermost polymer coating layer has a grammage in the range of 9-15 g/m 2 .
- the outermost polymer coating layer has a very smooth surface. More specifically, the outermost polymer coating layer forming an inside surface of the paperboard-based disposable cup has a PPS surface smoothness ⁇ 3 pm as determined according to ISO 8791-4:2007.
- the inside surface of the paperboard-based disposable cup has a PPS surface smoothness ⁇ 2 pm, preferably ⁇ 1.9 pm, and more preferably ⁇ 1.8 pm, as determined according to ISO 8791-4:2007.
- the second side of the paperboard-based laminate forming an outside surface of the paperboard-based disposable cup may also be provided with one or more coating layers, e.g. for improving the moisture resistance or printability of the outside surface of the paperboard-based disposable cup.
- the second side of the paperboard-based laminate forming an outside surface of the paperboard-based disposable cup comprises a pigment coating layer having a grammage in the range of 5-50 g/m 2 .
- the second side of the paperboard-based laminate forming an outside surface of the paperboard-based disposable cup comprises an outermost extrusion coated polymer layer, preferably a polyethylene layer, having a grammage in the range of 5-50 g/m 2 .
- the paperboard-based disposable cup is intended for serving beverages in general, and beer in particular.
- the paperboard-based disposable cup has an inner volume in the range of 50-2000 ml.
- a method for manufacturing a paperboard-based disposable cup comprising: a) manufacturing a paperboard-based laminate by i. providing a paperboard substrate, ii. applying a liquid dispersion comprising a pigment and a binder onto a first side of the paperboard substrate and drying the applied liquid dispersion to obtain a pigment coating layer having a grammage in the range of 10-20 g/m 2 and a PPS surface smoothness ⁇ 2 pm, preferably ⁇ 1.7 pm, and more preferably ⁇ 1.5 pm, as determined according to ISO 8791-4:2007, iii.
- the paperboard substrate, the pigment coating layer, and the outermost polymer coating layer may be further defined as described above with reference to the first aspect.
- the pigment coating layer is formed by applying a first liquid dispersion comprising a pigment and a binder onto a first side of the paperboard substrate and drying the applied first liquid dispersion to obtain a precoat layer, and applying a second liquid dispersion comprising a pigment and a binder onto the precoat layer and drying the applied second liquid dispersion to obtain a topcoat layer on the precoat layer.
- the composition and grammage of the precoat layer and the topcoat layer may be the same or different.
- the composition and grammage of the precoat layer and the topcoat layer may be further defined as described above with reference to the first aspect.
- the liquid dispersion may be applied by contact or non-contact coating methods.
- useful coating methods include, but are not limited to rod coating, curtain coating, film press coating, cast coating, transfer coating, size press coating, flexographic coating, gate roll coating, twin roll HSM coating, blade coating, such as short dwell time blade coating, jet applicator coating, spray coating, gravure coating or reverse gravure coating.
- the liquid dispersion is applied by blade coating.
- the polymer applied in iii. is preferably applied by extrusion coating.
- the surface of the cooling cylinder used in the extrusion coating should preferably be smooth.
- the cooling cylinder used in the extrusion coating is chromium-plated.
- the cooling cylinder used in the extrusion coating is highly polished.
- the surface of the cooling cylinder used in the extrusion coating has an average roughness (Ra) of ⁇ 0.25 pm, preferably ⁇ 0.10 pm, and more preferably ⁇ 0.025 pm.
- the cooling cylinder used in the extrusion coating is of the “GLF” type.
- the cooling cylinder used in the extrusion coating is of the mirror finish or mirror pocket type.
- the equipment used in the pouring test involved a laboratory stand and two clamps. An opened 330 ml beer can containing lager beer was attached to the upper clamp horizontally. A 75 mm glass funnel was attached to the lower clamp to simulate the mouth of a beer tap. The final pouring angle was adjusted so that the 330 ml beer can ran empty in 17 seconds. The time was confirmed with a stopwatch. This time was selected based on the assumption that a commercial beer tap fills the cup with 400 ml of beer in 20 seconds. The distance between the bottom part of the beer can and the top part of the glass funnel was approx. 30 mm in the setup. The temperature of beer was 4 °C in the experiment.
- a 500 ml disposable plastic (PP) beer cup was used as reference sample.
- the 500 ml disposable plastic beer cup was placed under the outlet of the glass funnel. The distance between the outlet and the internal wall of the cup was approx. 30-40 mm.
- the cup was positioned in an angle of 20° to the flat table surface with the aid of plastic support placed under the cup. The beer was first in contact with the cup wall, not the cup bottom as in a typical beer tap setup. The number of parallel determinations was three.
- the same procedure was then repeated with different types of coated paperboard as the inside surface of the cup as set out in Table 1.
- the paperboards included three different standard polymer coated boards, and two different boards according to the proposed inventive concept.
- the internal wall of a plastic cup was covered prior to the pouring test with the paperboard substrate.
- the height of foam and liquid matrices was marked on the outer surface of the cup after immediate removal of the paperboard cover inside the cup.
- the whole pouring test was recorded with a video camera to ensure the quality of documentation of beer foaming behavior.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention relates to a paperboard-based disposable cup, said paperboard-based disposable cup being formed of a paperboard-based laminate, wherein a first side of the paperboard-based laminate forming an inside surface of the paperboard-based disposable cup comprises a pigment coating layer having a grammage in the range of 10-20 g/m2 and an outermost polymer coating layer having a grammage in the range of 5-25 g/m2, wherein the inside surface of the paperboard-based disposable cup has a PPS surface smoothness < 3 µm as determined according to ISO 8791-4:2007.
Description
PAPERBOARD-BASED DISPOSABLE CUP ARRANGED WITH AN INTERIOR LAYER WITH A LOW PPS-VALUE
Technical field
The present disclosure relates to paperboard-based disposable cups. More specifically, the present disclosure relates to paperboard-based disposable beverage cups suitable for serving beer.
Background
In large events such as outdoor festivals, beer is commonly served in plastic disposable cups. However, environmental concerns and changing legislation have caused strong pressure to reduce the use of plastic disposable items. However, the problem of excessive foaming with the current paperboard-based cups limits their potential to replace plastic beer cups.
Coating of paper and paperboard with plastics is often employed to combine the mechanical properties of the paperboard with the barrier and sealing properties of a plastic film. Paperboard provided with even a relatively small amount of a suitable plastic material can provide the properties needed to make the paperboard suitable for many demanding applications, for example as liquid or food packaging board. In liquid or food packaging board, polyolefin coatings are frequently used as liquid barrier layers, heat sealing layers and adhesives.
The foaming tendency of beer often limits the usage of paperboard-based disposable cups in beer serving. Due to excessive foaming, the filling of the cup takes too much time compared to glass or plastic beer cups. Especially in large festivals and similar events, filling of the cup must be done in a very short time. A typical requirement is that a cup should be fillable in 20 seconds with 400 ml of beer without overflowing. This requirement is not met with the current 2PE (double polyethylene coating layer) paperboard-based cups. For example, the paperboard cups must be filled with beer so slowly that the current automatic tap machines are not suitable without modification, which affects the volume of beer that can be sold.
Previous attempts to solve the problems with excessive foaming of beer in paperboard-based disposable cups have for example included adding surfactants to the polymer coating forming the inner surface of the cup. However, adding additional components to the surface intended for contact with the beverage to be consumed is generally undesired.
Thus, there remains a need for improved solutions to replace plastic disposable cups with paperboard-based disposable cups while avoiding the problems with excessive foaming in beer serving.
Description of the invention
It is an object of the present disclosure to provide a paperboard-based disposable cup with reduced foaming in beer serving.
It is a further object of the present disclosure, to provide a paperboard-based disposable cup with reduced foaming in beer serving using only components conventionally used in paperboard-based disposable cups.
The above-mentioned objects, as well as other objects as will be realized by the skilled person in the light of the present disclosure, are achieved by the various aspects of the present disclosure.
According to a first aspect illustrated herein, there is provided a paperboard-based disposable cup, said paperboard-based disposable cup being formed of a paperboard-based laminate, wherein a first side of the paperboard-based laminate forming an inside surface of the paperboard-based disposable cup comprises a pigment coating layer having a grammage in the range of 10-20 g/m2 and an outermost polymer coating layer having a grammage in the range of 5-25 g/m2, wherein the inside surface of the paperboard-based disposable cup has a PPS surface smoothness < 3 pm as determined according to ISO 8791-4:2007.
Surprisingly, the surface energy of board was found to had very little effect on foam formation. Instead, the smoothness of the inside surface of the cup was found to be the key factor influencing the foam formation. The present invention is based on the understanding that by providing a pigment coating layer underneath the outermost polymer coating layer forming the inside surface of the cup, a very smooth surface of the inside surface can be obtained. The smooth surface, having a PPS surface smoothness < 3 pm as determined according to ISO 8791-4:2007, has been found to significantly reduce the foaming tendency of beer served in the cup.
Paperboard generally refers to strong, thick paper or cardboard comprising cellulose fibers used for boxes and other types of packaging. Paperboard can either be bleached or unbleached, coated or uncoated, and produced in a variety of thicknesses, depending on the end use requirements.
The paperboard substrate used in the inventive method typically has a grammage of at least 100 g/m2 and a density in the range of below 600-1000 kg/m3. Unless otherwise stated, the grammage is determined according to the standard ISO 536. Unless otherwise stated, the density is determined according to the standard ISO 534. In some embodiments, the paperboard-based laminate of the paperboardbased disposable cup comprises a paperboard substrate having a grammage in the range of 150-400 g/m2. In some embodiments, the paperboard substrate has a bulk > 1.1 m3/kg, preferably > 1.2 m3/kg, and more preferably > 1.3 m3/kg, as determined according to ISO 534.
The paperboard may be a single ply material, or a multi-ply material comprised of two or more plies.
In some embodiments, the paperboard substrate is a multi-ply paperboard. In some embodiments the paperboard substrate is a multi-ply paperboard comprised of two or more plies. In some embodiments the paperboard substrate is a multi-ply paperboard comprised of three or more plies.
A common type of multi-ply paperboard is comprised of a lower density mid-ply (also sometimes referred to as “bulk ply”) sandwiched between two higher density outer plies. The lower density mid-ply may typically have a density below 750 kg/m3, preferably below 700, below 650, below 600, below 550, below 500, below 450, below 400 or below 350 kg/m3. The higher density outer plies typically have a density at least 100 kg/m3 higher than the mid-ply, preferably at least 200 kg/m3 higher than the mid-ply.
The paperboard substrate typically comprises kraft pulp. In some embodiments, the paperboard substrate consists of kraft pulp. In some embodiments, the paperboard substrate consists of a mixture of kraft pulp and chemi- thermomechanical (CTMP) or other mechanical pulps. In embodiments comprising a lower density mid-ply sandwiched between two higher density outer plies the outer plies may preferably consist of kraft pulp and the mid-ply may preferably consist of a mixture of kraft pulp and chemi-thermomechanical (CTMP) or other mechanical pulps.
Due to its fibrous composition, the paperboard substrate may typically have a relatively rough surface. In some embodiments, the paperboard substrate has a PPS (Parker Print-Surf) surface smoothness > 3 pm, typically > 5 pm, as determined according to ISO 8791-4:2007.
A paperboard-based laminate is a packaging material formed mainly from a paperboard substrate. In addition to the paperboard substrate, the paperboardbased laminate comprises additional layers or coatings designed to improve the performance and/or appearance of the laminate.
The paperboard substrate of the paperboard-based disposable cup is provided on a first side thereof facing the inside of the cup with a pigment coating layer. A pigment coating is a coating comprising at least one pigment and at least one binder. The pigment and binder are typically applied to the surface of the paperboard substrate in the form of a liquid, preferably aqueous, dispersion, and subsequently dried to obtain the pigment coating layer.
The grammage of the pigment coating layer is in the range of 10-20 g/m2. In some embodiments, the pigment coating layer has a grammage in the range of 13-15 g/m2.
In some embodiments, the pigment coating layer comprises at least one pigment and at least one binder. In some embodiments, the pigment coating layer comprises 60-70 wt% pigment and 20-30 wt% binder based on dry weight.
In some embodiments, the pigment comprises calcium carbonate and a platy pigment, preferably selected from the group consisting of kaolin, talc or a mixture thereof.
The binder may comprise a single binder or a combination of binders. The binder may preferably comprise a water-dispersible or water-soluble binder, or a combination thereof. In some embodiments, the binder is a latex, preferably selected from the group consisting of styrene acrylic (SA) latex, styrene butadiene (SB) latex, or a mixture thereof.
The pigment coating layer may preferably be applied in at least two different coating steps with drying of the coated film between the steps. Thus, in some embodiments, the pigment coating layer consists of two or more sub-layers.
In some embodiments, the pigment coating layer comprises a precoat layer formed on the paperboard substrate and a topcoat layer formed on the precoat layer.
In some embodiments, the precoat layer has a grammage in the range of 5-15 g/m2, preferably in the range of 6-12 g/m2.
In some embodiments, the precoat layer comprises 75-95 wt% pigment and 5-25 wt% binder, based on dry weight.
In some embodiments, the pigment in the precoat layer is calcium carbonate or a mixture of calcium carbonate and talc.
In some embodiments, the topcoat layer has a grammage in the range of 5-15 g/m2, preferably in the range of 6-9 g/m2.
In some embodiments, the topcoat layer comprises 20-50 wt% pigment and 50-80 wt% binder, based on dry weight.
In some embodiments, the pigment in the topcoat layer is platy pigment selected from the group consisting of kaolin, talc or a mixture thereof.
In some embodiments, the platy pigment in the topcoat layer has an aspect ratio above 10 and preferably above 20.
The pigment coating layer may also be calendered, preferably in a soft calender or belt calender.
In some embodiments, the pigment coating layer has a PPS surface smoothness < 2 pm, preferably < 1.7 pm, and more preferably < 1.5 pm, as determined according to ISO 8791-4:2007.
The paperboard-based laminate is further provided with an outermost polymer coating layer formed on the pigment coating layer. The outermost polymer coating layer preferably provides liquid barrier properties and mechanical protection for the paperboard-based laminate surface. The outermost polymer coating layer is preferably also heat-sealable.
The outermost polymer coating layer is preferably applied onto the pigment coating layer by extrusion coating. Extrusion coating is a process by which a molten plastic material is applied to a substrate to form a very thin, smooth and uniform layer. I.e., in a preferred embodiment, the outermost polymer coating layer is an outermost extrusion coated polymer layer.
The outermost polymer coating layer may comprise any of the thermoplastic polymers commonly used in protective and/or heat-sealable layers in paperboard-
based packaging laminates in general or polymers used in liquid or food packaging board in particular. Examples include polybutylene succinate (PBS), poly(butylene succinate-co-butylene adipate) (PBSA), polycaprolactone (PCL), poly(glycolic acid) (PGA), polyvinyl alcohol (PVOH), polybutylene adipate terephthalate (PBAT), polylactic acid (PLA), polyhydroxyalkanoates (PHA), polyhydroxybutyrate (PHB), starch, thermoplastic starch (TPS), cellulose acetate (CA), polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene furanoate (PEF), polypropylene (PP), polyamide 6 (PA6), polyamide 66 (PA66), polyamide 11 (PA11), polyamide 12 (PA12), polyamide 10.10 (PA10.10), and polyamide 6.10 (PA6.10). Preferred examples include polyethylene (PE), polyethylene terephthalate (PET), polyethylene furanoate (PEF), polypropylene (PP), polyhydroxyalkanoates (PHA), polylactic acid (PLA), polyglycolic acid (PGA), polyvinyl alcohol (PVOH), and starch. Polyethylenes, especially low density polyethylene (LDPE) and high density polyethylene (HDPE), are the most common and versatile polymers used in liquid or food packaging board. In some embodiments, the outermost polymer coating layer comprises polyethylene, preferably low-density polyethylene (LDPE). The polymers used are preferably manufactured from renewable materials.
Alternatively, the outermost polymer coating layer is applied onto the pigment coating layer by liquid coating methods. In some embodiments, the polymer is applied in the form of a dispersion, latex or solution of the of the polymer in a liquid carrier, and subsequently dried to form the outermost polymer coating layer. The outermost polymer coating layer applied by liquid coating methods may be applied by contact or non-contact coating methods. Examples of useful coating methods include, but are not limited to rod coating, curtain coating, film press coating, cast coating, transfer coating, size press coating, flexographic coating, gate roll coating, twin roll HSM coating, blade coating, such as short dwell time blade coating, jet applicator coating, spray coating, gravure coating or reverse gravure coating. In preferred embodiments the liquid dispersion is applied by blade coating.
The polymer applied in the form of a dispersion, latex or solution of the of the polymer in a liquid carrier may for example be selected from the group consisting
of a latex (e.g. styrene-acrylate (SA) latex, styrene-butadiene (SB) latex, or mixtures thereof), starch, carboxymethyl cellulose (CMC), polyolefins (e.g. polyethylene (PE), polypropylene (PP), or copolymers of polyethylene and polypropylene), polyhydroxyalkanoates (PHA), polyhydroxybutyrate (PHB), and polylactic acid (PLA).
In some embodiments, the outermost polymer coating layer further comprises 1-20 wt% of a pigment, based on dry weight.
The grammage of the outermost polymer coating layer is in the range of 5-25 g/m2. In some embodiments, the outermost polymer coating layer has a grammage in the range of 9-15 g/m2.
Thanks to the underlying pigment coating layer, the outermost polymer coating layer has a very smooth surface. More specifically, the outermost polymer coating layer forming an inside surface of the paperboard-based disposable cup has a PPS surface smoothness < 3 pm as determined according to ISO 8791-4:2007.
In some embodiments, the inside surface of the paperboard-based disposable cup has a PPS surface smoothness < 2 pm, preferably < 1.9 pm, and more preferably < 1.8 pm, as determined according to ISO 8791-4:2007.
The second side of the paperboard-based laminate forming an outside surface of the paperboard-based disposable cup may also be provided with one or more coating layers, e.g. for improving the moisture resistance or printability of the outside surface of the paperboard-based disposable cup.
In some embodiments, the second side of the paperboard-based laminate forming an outside surface of the paperboard-based disposable cup comprises a pigment coating layer having a grammage in the range of 5-50 g/m2.
In some embodiments, the second side of the paperboard-based laminate forming an outside surface of the paperboard-based disposable cup comprises an
outermost extrusion coated polymer layer, preferably a polyethylene layer, having a grammage in the range of 5-50 g/m2.
The paperboard-based disposable cup is intended for serving beverages in general, and beer in particular. In some embodiments, the paperboard-based disposable cup has an inner volume in the range of 50-2000 ml.
According to a second aspect illustrated herein, there is provided a method for manufacturing a paperboard-based disposable cup, said method comprising: a) manufacturing a paperboard-based laminate by i. providing a paperboard substrate, ii. applying a liquid dispersion comprising a pigment and a binder onto a first side of the paperboard substrate and drying the applied liquid dispersion to obtain a pigment coating layer having a grammage in the range of 10-20 g/m2 and a PPS surface smoothness < 2 pm, preferably < 1.7 pm, and more preferably < 1.5 pm, as determined according to ISO 8791-4:2007, iii. applying a polymer layer by extrusion or liquid coating methods onto the pigment coating layer to obtain an outermost polymer coating layer having a grammage in the range of 5-25 g/m2 and a PPS surface smoothness < 3 pm as determined according to ISO 8791-4:2007; and b) converting the paperboard-based laminate into a paperboard-based disposable cup, wherein the outermost polymer coating layer forms an inside surface of the paperboard-based disposable cup.
The paperboard substrate, the pigment coating layer, and the outermost polymer coating layer may be further defined as described above with reference to the first aspect.
In some embodiments, the pigment coating layer is formed by applying a first liquid dispersion comprising a pigment and a binder onto a first side of the paperboard substrate and drying the applied first liquid dispersion to obtain a
precoat layer, and applying a second liquid dispersion comprising a pigment and a binder onto the precoat layer and drying the applied second liquid dispersion to obtain a topcoat layer on the precoat layer. The composition and grammage of the precoat layer and the topcoat layer may be the same or different. The composition and grammage of the precoat layer and the topcoat layer may be further defined as described above with reference to the first aspect.
The liquid dispersion may be applied by contact or non-contact coating methods. Examples of useful coating methods include, but are not limited to rod coating, curtain coating, film press coating, cast coating, transfer coating, size press coating, flexographic coating, gate roll coating, twin roll HSM coating, blade coating, such as short dwell time blade coating, jet applicator coating, spray coating, gravure coating or reverse gravure coating. In preferred embodiments the liquid dispersion is applied by blade coating.
The polymer applied in iii. Is preferably applied by extrusion coating. The surface of the cooling cylinder used in the extrusion coating should preferably be smooth. In some embodiments, the cooling cylinder used in the extrusion coating is chromium-plated. In some embodiments, the cooling cylinder used in the extrusion coating is highly polished. In some embodiments, the surface of the cooling cylinder used in the extrusion coating has an average roughness (Ra) of < 0.25 pm, preferably < 0.10 pm, and more preferably < 0.025 pm. In some embodiments, the cooling cylinder used in the extrusion coating is of the “GLF” type. In some embodiments, the cooling cylinder used in the extrusion coating is of the mirror finish or mirror pocket type.
Generally, while the products, polymers, materials, layers and processes are described in terms of “comprising” various components or steps, the products, polymers, materials, layers and processes can also “consist essentially of” or “consist of” the various components and steps.
While the invention has been described with reference to various exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without
departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.
EXAMPLES
Example - Beer pouring test
The equipment used in the pouring test involved a laboratory stand and two clamps. An opened 330 ml beer can containing lager beer was attached to the upper clamp horizontally. A 75 mm glass funnel was attached to the lower clamp to simulate the mouth of a beer tap. The final pouring angle was adjusted so that the 330 ml beer can ran empty in 17 seconds. The time was confirmed with a stopwatch. This time was selected based on the assumption that a commercial beer tap fills the cup with 400 ml of beer in 20 seconds. The distance between the bottom part of the beer can and the top part of the glass funnel was approx. 30 mm in the setup. The temperature of beer was 4 °C in the experiment.
A 500 ml disposable plastic (PP) beer cup was used as reference sample. The 500 ml disposable plastic beer cup was placed under the outlet of the glass funnel. The distance between the outlet and the internal wall of the cup was approx. 30-40 mm. The cup was positioned in an angle of 20° to the flat table surface with the aid of plastic support placed under the cup. The beer was first in contact with the cup wall, not the cup bottom as in a typical beer tap setup. The number of parallel determinations was three.
The same procedure was then repeated with different types of coated paperboard as the inside surface of the cup as set out in Table 1. The paperboards included three different standard polymer coated boards, and two different boards according to the proposed inventive concept. The internal wall of a plastic cup was covered prior to the pouring test with the paperboard substrate. The height of foam
and liquid matrices was marked on the outer surface of the cup after immediate removal of the paperboard cover inside the cup. The whole pouring test was recorded with a video camera to ensure the quality of documentation of beer foaming behavior.
The properties and phenomena that were followed during the experiment included: i) the height of formed foam layer, ii) the structure of the foam (lamellar or not) and iii) potential occurrence overfoaming. The presence of lamellar foam is theoretically desired because it indicates rapid degradation of foam and thus less risk of overfoaming. In addition, the PPS (Parker Print-Surf) surface smoothness of each inside surface was determined according to ISO 8791-4:2007 (1.0 MPa).
Notes:
>10 cm foam means that the overfoaming was so strong that it was impossible to determine the initial height of foam layer. 10 cm was still somewhat measurable and overfoaming was not heavy.
Claims
1 . A paperboard-based disposable cup, said paperboard-based disposable cup being formed of a paperboard-based laminate, wherein a first side of the paperboard-based laminate forming an inside surface of the paperboard-based disposable cup comprises a pigment coating layer having a grammage in the range of 10-20 g/m2 and an outermost polymer coating layer having a grammage in the range of 5-25 g/m2, wherein the inside surface of the paperboard-based disposable cup has a PPS surface smoothness < 3 pm as determined according to ISO 8791-4:2007.
2. The paperboard-based disposable cup according to claim 1 , wherein the paperboard substrate has a PPS surface smoothness > 3 pm, as determined according to ISO 8791-4:2007.
3. The paperboard-based disposable cup according to any one of the preceding claims, wherein the pigment coating layer has a grammage in the range of 13-15 g/m2.
4. The paperboard-based disposable cup according to any one of the preceding claims, wherein the pigment coating layer comprises at least one pigment and at least one binder.
5. The paperboard-based disposable cup according any one of the preceding claims, wherein the pigment coating layer comprises 60-70 wt% pigment and 20- 30 wt% binder based on dry weight.
6. The paperboard-based disposable cup according to any one of claims 4-5, wherein the pigment comprises calcium carbonate and a platy pigment, preferably selected from the group consisting of kaolin, talc or a mixture thereof.
7. The paperboard-based disposable cup according to any one of claims 4-6, wherein the binder is a latex, preferably selected from the group consisting of styrene acrylic (SA) latex, styrene butadiene (SB) latex, or a mixture thereof.
8. The paperboard-based disposable cup according to any one of the preceding claims, wherein the pigment coating layer consists of two or more sub-layers.
9. The paperboard-based disposable cup according to claim 8, wherein the pigment coating layer comprises a precoat layer formed on the paperboard substrate and a topcoat layer formed on the precoat layer.
10. The paperboard-based disposable cup according to claim 9, wherein the precoat layer has a grammage in the range of 5-15 g/m2, preferably in the range of 6-12 g/m2.
11. The paperboard-based disposable cup according to any one of claims 9-10, wherein the precoat layer comprises 75-95 wt% pigment and 5-25 wt% binder, based on dry weight.
12. The paperboard-based disposable cup according to any one of claims 9-11 , wherein the pigment in the precoat layer is calcium carbonate or a mixture of calcium carbonate and talc.
13. The paperboard-based disposable cup according to any one of claims 9-12, wherein the topcoat layer has a grammage in the range of 5-15 g/m2, preferably in the range of 6-9 g/m2.
14. The paperboard-based disposable cup according to any one of claims 9-13, wherein the topcoat layer comprises 20-50 wt% pigment and 50-80 wt% binder, based on dry weight.
15. The paperboard-based disposable cup according to any one of claims 9-14, wherein the pigment in the topcoat layer is platy pigment selected from the group consisting of kaolin, talc or a mixture thereof.
16. The paperboard-based disposable cup according to claim 15, wherein the platy pigment in the topcoat layer has an aspect ratio above 10 and preferably above 20.
17. The paperboard-based disposable cup according to any one of the preceding claims, wherein the pigment coating layer has a PPS surface smoothness < 2 pm, preferably < 1.7 pm, and more preferably < 1.5 pm, as determined according to ISO 8791-4:2007.
18. The paperboard-based disposable cup according to any one of the preceding claims, wherein the inside surface of the paperboard-based disposable cup has a PPS surface smoothness < 2 pm, preferably < 1.9 pm, and more preferably < 1.8 pm, as determined according to ISO 8791-4:2007.
19. A method for manufacturing a paperboard-based disposable cup, said method comprising: a) manufacturing a paperboard-based laminate by i. providing a paperboard substrate, ii. applying a liquid dispersion comprising a pigment and a binder onto a first side of the paperboard substrate and drying the applied liquid dispersion to obtain a pigment coating layer having a grammage in the range of 10-20 g/m2 and a PPS surface smoothness < 2 pm, preferably < 1.7 pm, and more preferably < 1.5 pm, as determined according to ISO 8791-4:2007, iii. applying a polymer coating layer onto the pigment coating layer to obtain an outermost polymer coating layer having a grammage in the range of 5-25 g/m2 and a PPS surface smoothness < 3 pm as determined according to ISO 8791-4:2007; and b) converting the paperboard-based laminate into a paperboard-based disposable cup, wherein the outermost polymer coating layer forms an inside surface of the paperboard-based disposable cup.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE2230265-7 | 2022-08-16 | ||
SE2230265A SE2230265A1 (en) | 2022-08-16 | 2022-08-16 | Paperboard-based disposable cup |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2024038332A1 true WO2024038332A1 (en) | 2024-02-22 |
Family
ID=89941355
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2023/057176 WO2024038332A1 (en) | 2022-08-16 | 2023-07-13 | Paperboard-based disposable cup arranged with an interior layer with a low pps-value |
Country Status (2)
Country | Link |
---|---|
SE (1) | SE2230265A1 (en) |
WO (1) | WO2024038332A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090297808A1 (en) * | 2008-05-28 | 2009-12-03 | Fugitt Gary P | Low density paperboard |
US20180347116A1 (en) * | 2015-11-23 | 2018-12-06 | Westrock Mwv, Llc | Heat sealable coating with filler |
US20210222370A1 (en) * | 2020-01-22 | 2021-07-22 | Westrock Mwv, Llc | Heat-sealable paperboard structures and methods |
WO2021145943A1 (en) * | 2020-01-17 | 2021-07-22 | Westrock Mwv, Llc | Anti-blocking high barrier paperboard structures |
-
2022
- 2022-08-16 SE SE2230265A patent/SE2230265A1/en unknown
-
2023
- 2023-07-13 WO PCT/IB2023/057176 patent/WO2024038332A1/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090297808A1 (en) * | 2008-05-28 | 2009-12-03 | Fugitt Gary P | Low density paperboard |
US20180347116A1 (en) * | 2015-11-23 | 2018-12-06 | Westrock Mwv, Llc | Heat sealable coating with filler |
WO2021145943A1 (en) * | 2020-01-17 | 2021-07-22 | Westrock Mwv, Llc | Anti-blocking high barrier paperboard structures |
US20210222370A1 (en) * | 2020-01-22 | 2021-07-22 | Westrock Mwv, Llc | Heat-sealable paperboard structures and methods |
Also Published As
Publication number | Publication date |
---|---|
SE2230265A1 (en) | 2024-02-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN112368443B (en) | Repulpable packaging material | |
EP0801603B1 (en) | Coated sheet material and method | |
RU2753930C2 (en) | Method for producing packaging material and packaging material produced with this method | |
EP3784833B1 (en) | Heat-sealable paperboard structures and associated paperboard-based containers | |
US11952720B2 (en) | Repulpable packaging material | |
EP3710548B1 (en) | Heat-seal coatings | |
US20200291580A1 (en) | Barrier laminate with excellent barrier properties against moisture and gas and method of manufacturing same | |
US20220162804A1 (en) | Heat-sealable paperboard | |
EP2791414A1 (en) | Methods to form an ionomer coating on a substrate | |
JP2019127670A (en) | Paper substrate for foam heat insulation paper container, sheet for foam heat insulation paper container, and foam heat insulation paper container | |
US20210222370A1 (en) | Heat-sealable paperboard structures and methods | |
JP2023526063A (en) | Packaging materials for the packaging of liquids and foods | |
JP7255740B1 (en) | Base paper for metallized paper, metallized paper, packaging bags, laminates, and paper containers for liquids | |
JP7027897B2 (en) | Foam Insulation Paper Container Paper Base Material, Foam Insulation Paper Container Sheet and Foam Insulation Paper Container | |
WO2024038332A1 (en) | Paperboard-based disposable cup arranged with an interior layer with a low pps-value | |
JP2021176784A (en) | Paper base material for foamed heat-insulation paper container, sheet for foamed heat-insulation paper container, and foamed heat-insulation paper container | |
JP7027894B2 (en) | Foam Insulation Paper Container Paper Base Material, Foam Insulation Paper Container Sheet and Foam Insulation Paper Container | |
JP2019090130A (en) | Method for producing foam insulation paper container paper base, method for producing sheet for foam insulation paper container, method for producing foam insulation paper container, and foam insulation paper container paper base | |
JP2021028431A (en) | Paper base material for foamed heat-insulation paper container, sheet for foamed heat-insulation paper container, and foamed heat-insulation paper container | |
WO2024088887A1 (en) | Multilayer metallized paper-based packaging material | |
JP2023097230A (en) | Packaging paper and packaging material | |
WO2024121097A1 (en) | Heat sealable coated paper product | |
WO2024004858A1 (en) | Laminated paper and liquid container | |
JP2023526603A (en) | Packaging material manufacturing method | |
WO2023161890A1 (en) | Paper or paperboard based packaging laminate |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 23854588 Country of ref document: EP Kind code of ref document: A1 |