EP4187014A1 - Papier ou carton revêtu d'amidon - Google Patents

Papier ou carton revêtu d'amidon Download PDF

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Publication number
EP4187014A1
EP4187014A1 EP21210830.2A EP21210830A EP4187014A1 EP 4187014 A1 EP4187014 A1 EP 4187014A1 EP 21210830 A EP21210830 A EP 21210830A EP 4187014 A1 EP4187014 A1 EP 4187014A1
Authority
EP
European Patent Office
Prior art keywords
coating
starch
product
calcium carbonate
dry weight
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.)
Withdrawn
Application number
EP21210830.2A
Other languages
German (de)
English (en)
Inventor
Johan Larsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Billerud AB
Original Assignee
Billerud AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Billerud AB filed Critical Billerud AB
Priority to EP21210830.2A priority Critical patent/EP4187014A1/fr
Priority to PCT/EP2022/083031 priority patent/WO2023094476A1/fr
Priority to CA3238988A priority patent/CA3238988A1/fr
Publication of EP4187014A1 publication Critical patent/EP4187014A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • 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
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • 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
    • D21H19/80—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
    • 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
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply

Definitions

  • the present disclosure relates to the field of paper and paperboard intended to be covered by a polyolefin layer.
  • the inventor has noted that a problem of the above-mentioned starch coating is that the starch-coated surface has inferior adhesion to polyolefins. Accordingly, there may be a delamination problem after a polyolefin film has been laminated to a starch-coated paper or paperboard surface.
  • An objective of the present disclosure is to provide an alternative coating of that provides better adhesion to polyolefins.
  • the present disclosure provides a product comprising a paper substrate, such as a paperboard substrate, and a first coating provided on the substrate, wherein the first coating comprises starch and calcium carbonate pigment, preferably in a dry weight ratio between 21:100 and 500:100.
  • the present disclosure provides a product comprising a paper substrate and a first coating provided on the substrate, wherein the first coating comprises starch and calcium carbonate (CaCO 3 ) pigment.
  • the starch may be natural or modified starch.
  • the starch may comprise dissolved starch molecules and/or starch particles that are not dissolved, but suspended in water.
  • At least 90%, such as at least 95%, by dry weight of all the pigment in the first coating is calcium carbonate pigment.
  • the d 50 of the calcium carbonate pigment maybe 0.60-0.80 ⁇ m and the d 98 of the calcium carbonate pigment is preferably at least 2.8 ⁇ m, such as 2.9-4.0 ⁇ m.
  • the d 75 of the calcium carbonate pigment may be 1.0-1.4 ⁇ m
  • d values The skilled person working with calcium carbonate pigments is familiar with d values.
  • a Sedigraph 5100 or 5120 device from the company Micromeritics, USA can be used.
  • the particle size distributions given herein were determined using a Micromeritics Sedigraph III with software version V.1.04.
  • the calcium carbonate pigment is preferably ground calcium carbonate (GCC).
  • the dry weight ratio of starch to calcium carbonate in the first coating may for example be between 10:100 and 500:100.
  • pigment coatings typically comprise 10-20 parts binding agent per 100 parts of pigment.
  • a preferred embodiment of the first coating has 21-500 parts of starch per 100 parts of calcium carbonate pigment.
  • the lower limit for the proportion of starch is 25 or 33 parts per 100 parts of calcium carbonate pigment.
  • the dry weight ratio of starch to calcium carbonate in the first coating is between 21:100 and 500:100 in a preferred embodiment and between 25:100 and 500:100 in a more preferred embodiment.
  • the dry weight ratio of starch to calcium carbonate in the first coating is between 33:100 and 300:100, such as between 50:100 and 500:100, such as between 150:100 and 500:100.
  • Starch and calcium carbonate pigment typically constitute at least 80% of the dry weight of the first coating. Preferably, they constitute at least 90% of the dry weight of the first coating and more preferably at least 95% of the dry weight of the first coating.
  • the first coating may comprise a rheology modifier.
  • the rheology modifier typically amounts to 0.05-2.0 %, such as 0.1-1.1%, of the dry weight of the first coating.
  • the rheology modifier may for example be CMC or an acrylic co-polymer, such as an alkali-swellable emulsion (ASE) or a hydrophobically modified, alkali-swellable emulsion (HASE) or a high molecular weight starch or a polyvinyl alcohol.
  • the coat weight of the first coating is thus preferably at least 0.5 g/m 2 and may for example be between 0.5 and 20 g/m 2 , such as between 0.5 and 15 g/m 2 , such as between 0.5 and 10 g/m 2 .
  • the coat weight is between 0.5 and 4.5 g/m 2 , such as between 0.5 and 2.9 g/m 2 , such as between 0.8 and 2.0 g/m 2 .
  • the first coating may be applied in two layers, in particular if the coat weight is higher, such as above 6 g/m 2 .
  • the paper substrate is a multi-layered linerboard or paperboard having a grammage according to ISO 536:2019 of 120-500 g/m 2 , such as 150-500 g/m 2 or 120-300 g/m 2 .
  • the a multi-layered linerboard or paperboard typically has a density according to ISO 534:2011 of 550-900 kg/m3.
  • Liquid packaging board (LPB) is preferred type of multi-layered paperboard.
  • the LPB may have a basis weight according to ISO 536:2019 of 120-300 g/m 2 , such as 125-260 g/m 2 .
  • the LPB typically comprises hydrophobic size, e.g. rosin size, AKD and/or ASA.
  • the LPB comprises rosin size in combination with AKD or ASA.
  • the hydrophobic size is preferably provided as internal sizing (i.e. added in the wet end of the paperboard machine).
  • the paper substrate is intended to be printed on one side thereof (e.g. by water-based flexo or rotogravure, which are surface sensitive printing techniques), it is preferably the other side (the “reverse side") that is provided with the first coating. Further, a second coating may be provided of the side intended to be printed (the "printing side").
  • the second coating preferably comprises pigment and a polymeric binder.
  • polymeric binders are styrene-butadiene copolymers, styrene-acrylate copolymers, other latex-forming polymers and starch.
  • the styrene-acrylate copolymers are more preferred than the styrene-butadiene copolymers due to lesser health and environmental concerns.
  • the dry weight ratio of polymeric binder to pigment in the second coating is preferably between 10:100 and 20:100.
  • the pigment of second coating preferably comprises or consists of calcium carbonate and/or clay.
  • a suitable example of the second coating is the pigment coating disclosed in WO 2018/189283 , which provides satisfactory PE adhesion in combination with satisfactory printing properties.
  • the coat weight of the second coating is typically 5-30 g/m 2 , such as 6-25 g/m 2 , such as 7-22 g/m 2 , such as 8-20 g/m 2 .
  • the coat weight of the first coating is at least 50% lower than the coat weight of the second coating.
  • the coat weight of the first coating is 0.5-2.9 g/m 2 at least 60% lower than the coat weight of the second coating.
  • the second coating comprises starch and calcium carbonate pigment, preferably in a dry weight ratio between 21:100 and 500:100.
  • This embodiment is advantageous when there is a need to reduce linting and obtain a strong polyolefin adhesion on both sides.
  • This coating layer may improve the printing properties compared to uncoated paper, however if the printing properties requirements are high then a different coating can be employed for the print side.
  • the product discussed above may further comprise a polyolefin layer, such as a polyethylene (PE) layer, provided on the first coating.
  • a polyolefin layer such as a polyethylene (PE) layer
  • the product may also comprise a second polyolefin layer (e.g. PE layer) provided on the second coating.
  • the surface of the second coating may be printed before the second polyolefin layer is applied.
  • the product 100 comprises a multilayered paperboard substrate 101 comprising a printing layer 102, a middle layer 103 and a reverse layer 104.
  • the paperboard substrate 101 thus has a printing side 105 and a reverse side 106.
  • a first coating 107 is provided on the reverse side 106.
  • the dry content of the first coating 107 consists essentially of starch, calcium carbonate pigment and rheology modifier.
  • the dry weight ratio of starch to calcium carbonate pigment is between 21:100 and 500:100.
  • the rheology modifier amounts to 0.05-2.0 % of the dry weight of the first coating 107.
  • the coat weight of the first coating 107 is in the range of 0.5-2.9 g/m 2 .
  • a second coating 108 is provided on the printing side 105.
  • the second coating has two sublayers 108a and 108b (typically applied in two subsequent coating steps).
  • the coat weight of the second coating 108 is in the range of 7-22 g/m 2 .
  • the composition of the sublayers 108a and 108b may be the same or different, but both comprise polymeric binder and pigment in a dry weight ratio between 10:100 and 20:100.
  • the upper surface of the uppermost sublayer 108b is intended to be printed.
  • the first coating 107 is intended to be covered by a polyolefin layer.
  • the product 200 comprises a multilayered paperboard substrate 201 comprising a first outer layer 202, a middle layer 203 and a second outer layer 204.
  • a first coating 207 is provided on the outer surface of the first outer layer 202 and a second coating 208 is provided on the outer surface of the second outer layer 204.
  • the dry content of each of the first coating 207 and the second coating 208 consists essentially of starch, calcium carbonate pigment and rheology modifier, wherein the dry weight ratio of starch to calcium carbonate pigment is between 21:100 and 500:100.
  • the rheology modifier amounts to 0.05-2.0 % of the dry weight of the first coating 207 and the second coating 208.
  • the coat weight of each of the first coating 207 and the second coating 208 is in the range of 0.5-2.9.
  • the first coating 207 and the second coating 208 are intended to be covered by a polyolefin layer. Further, the coatings 207, 208 result in improved bending stiffness (since the starch improves the tensile strength of the outer layers 202, 204.
  • a two-layered paperboard having a white (bleached) top/print layer and a brown (unbleached) reverse layer was provided. Both layers were formed from kraft pulp and the basis weight of the paperboard was 192 g/m 2 .
  • the paperboard was coated on the reverse side with compositions comprising pigment, starch (Perfectafilm A150 from Avebe) and rheology modifier (Rheocoat 66 SN from Coatex, which is an alkali-swellable emulsion of acrylic copolymer) in different ratios.
  • the pigment was talc (C15 B2 from Elementis), CaCO 3 (HydroCarb 90 (HC90) from OMYA) or clay (Kaovit from Thiele, which is a delaminated kaolin clay).
  • talc C15 B2 from Elementis
  • CaCO 3 HydroCarb 90 (HC90) from OMYA
  • clay Kaovit from Thiele, which is a delaminated kaolin clay
  • the trial series was run in a gravure pre-metered size press (manufactured by UMV coating) in direct offset mode by coating the reverse side, which usually faces the inside of a package formed from the board.
  • Coat weight was measured as an average by a traversing frame consisting of ash sensor, moisture sensor and basis weight sensor in a 2-frame system, one frame before coating and the other frame after the coating and drying.
  • the difference between the average basis weight sensors output, corrected for moisture content, was used as the measurement of basis weight increase, i.e. coat weight in this case.
  • the average value is taken from several measurement points in both cross and machine direction during the coating trial.
  • the measuring frame was supplied by Honeywell.
  • the pigment-coated paperboard was then extrusion-coated with low density polyethylene (LDPE CA8200 from Borealis).
  • the extrusion die was set to 320 °C.
  • a 3 sized samples of the pigment-coated paperboard were taped to a 820 mm wide 70 g/m 2 kraft paper to get a carrier to take the sheets through the machine.
  • the coat weight was 40 g/m 2 divided between two slots in the die.
  • Ozone was used just before the nip to further oxidize the polymer melt and a pre-treatment of corona at 12kW before the extrusion station was employed to the paper and paperboard samples on the surface to be coated.
  • Line speed was 100m/min
  • press roll was set to 3.2 kp/cm 2 and the chill roll surface was set to 20 °C.
  • F max the maximum force determined in a peel test
  • the method of measuring F max is described in more detail below.
  • the results of the F max testing are shown in Table 1 below.
  • a composition comprising 100 parts of CaCO 3 and 100 part of starch (sample 4) resulted in significantly higher F max than a composition comprising 100 parts of clay or talc and 100 parts of starch (sample 9 or 10). It is also noted that F max increases with an increased proportion of starch in the CaCO 3 /starch mixtures, which may be considered surprising given the inferior polyolefin adhesion of surfaces coated with starch only. Another beneficial effect of an increased proportion of starch is that lower coat weights are enabled.
  • the method described below is designed to determine how well a final product, such as a liquid package, performs when subjected to mechanical stress by measuring the cohesion of the coating layer.
  • the instrument used for the method is made by Instron, but any quality tensile tester will suffice.

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  • Paper (AREA)
EP21210830.2A 2021-11-26 2021-11-26 Papier ou carton revêtu d'amidon Withdrawn EP4187014A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP21210830.2A EP4187014A1 (fr) 2021-11-26 2021-11-26 Papier ou carton revêtu d'amidon
PCT/EP2022/083031 WO2023094476A1 (fr) 2021-11-26 2022-11-23 Papier ou carton revêtus d'amidon
CA3238988A CA3238988A1 (fr) 2021-11-26 2022-11-23 Papier ou carton revetus d'amidon

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21210830.2A EP4187014A1 (fr) 2021-11-26 2021-11-26 Papier ou carton revêtu d'amidon

Publications (1)

Publication Number Publication Date
EP4187014A1 true EP4187014A1 (fr) 2023-05-31

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Family Applications (1)

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EP21210830.2A Withdrawn EP4187014A1 (fr) 2021-11-26 2021-11-26 Papier ou carton revêtu d'amidon

Country Status (3)

Country Link
EP (1) EP4187014A1 (fr)
CA (1) CA3238988A1 (fr)
WO (1) WO2023094476A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008073426A1 (fr) * 2006-12-11 2008-06-19 International Paper Company Composition d'encollage de papier, papier encollé et procédé d'encollage de papier
WO2014003556A1 (fr) * 2012-06-29 2014-01-03 Coöperatie Avebe U.A. Procédés et moyens destinés au couchage du papier par dépôt d'un film
US20170328005A1 (en) * 2015-02-11 2017-11-16 Westrock Mwv, Llc Printable compostable paperboard
EP3260292A1 (fr) * 2016-06-23 2017-12-27 Tetra Laval Holdings & Finance S.A. Procédé de production d'un matériau d'emballage pour un emballage stérilisable en autoclave
US20210245481A1 (en) * 2018-06-12 2021-08-12 Stora Enso Oyj Re-pulpable packaging material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008073426A1 (fr) * 2006-12-11 2008-06-19 International Paper Company Composition d'encollage de papier, papier encollé et procédé d'encollage de papier
WO2014003556A1 (fr) * 2012-06-29 2014-01-03 Coöperatie Avebe U.A. Procédés et moyens destinés au couchage du papier par dépôt d'un film
US20170328005A1 (en) * 2015-02-11 2017-11-16 Westrock Mwv, Llc Printable compostable paperboard
EP3260292A1 (fr) * 2016-06-23 2017-12-27 Tetra Laval Holdings & Finance S.A. Procédé de production d'un matériau d'emballage pour un emballage stérilisable en autoclave
US20210245481A1 (en) * 2018-06-12 2021-08-12 Stora Enso Oyj Re-pulpable packaging material

Also Published As

Publication number Publication date
WO2023094476A1 (fr) 2023-06-01
CA3238988A1 (fr) 2023-06-01

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