WO2022071871A1 - Papier pour carton ondulé à haut rendement - Google Patents

Papier pour carton ondulé à haut rendement Download PDF

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Publication number
WO2022071871A1
WO2022071871A1 PCT/SE2021/050970 SE2021050970W WO2022071871A1 WO 2022071871 A1 WO2022071871 A1 WO 2022071871A1 SE 2021050970 W SE2021050970 W SE 2021050970W WO 2022071871 A1 WO2022071871 A1 WO 2022071871A1
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WO
WIPO (PCT)
Prior art keywords
containerboard
high yield
cellulose fibres
group
fibres
Prior art date
Application number
PCT/SE2021/050970
Other languages
English (en)
Inventor
Jan Andersson
Tommy WIKSAND
Jonas Jonsson
Christer Sandberg
Original Assignee
Holmen 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 Holmen Ab filed Critical Holmen Ab
Priority to EP21791489.4A priority Critical patent/EP4222311A1/fr
Publication of WO2022071871A1 publication Critical patent/WO2022071871A1/fr

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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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/10—Mixtures of chemical and mechanical pulp
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/007—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and at least partly composed of recycled material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N5/00—Manufacture of non-flat articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
    • B27N7/005—Coating boards, e.g. with a finishing or decorating layer
    • 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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/08—Corrugated paper or cardboard
    • 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
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B65D65/403—Applications of laminates for particular packaging purposes with at least one corrugated layer
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • 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
    • D21H1/00—Paper; Cardboard
    • D21H1/02—Multi-ply material finished plies
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/08—Mechanical or thermomechanical pulp
    • 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
    • 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
    • D21H27/40—Multi-ply at least one of the sheets being non-planar, e.g. crêped
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/26—All layers being made of paper or paperboard

Definitions

  • the present application relates to a high yield containerboard, a method of producing such a high yield containerboard, a containerboard product, a packaging material, a container and a high yield liner or high yield fluting according to the annexed claims.
  • the containerboard comprises, a first group of high yield cellulose fibres produced by mechanical defibration of wood chips.
  • the first group may comprise cellulose fibres chosen from a group consisting of: any kind of mechanical pulp (MP) fibres e.g.
  • the high yield containerboard may comprise an optional second group of cellulose fibres.
  • the second group of cellulose fibres are chosen from a group consisting of chemical cellulose fibres, sulphate cellulose fibres, sulphite cellulose fibres, OCC and/or recycled chemical cellulose fibres.
  • the high yield containerboard comprises at least 16 dry weight % of the first group of cellulose fibres.
  • the cellulose fibres in the first group may comprise virgin cellulose fibres.
  • the optional second group may comprise virgin cellulose fibres. It may be so that the first group consists of only virgin cellulose fibres. It may be so that the optional second group only consists of virgin cellulose fibres.
  • the advantage of the high yield containerboard is that the wood material put into the process will be efficiently used in the ensuing high yield containerboard.
  • the first group of cellulose fibres provides excellent yield in producing the high yield containerboard.
  • having at least 16 % of the high yield containerboard coming from the first group of cellulose fibres gives both a high yield requiring less wood chips as starting material per unit of needed high yield, and also a sufficiently strong high yield containerboard.
  • a high yield containerboard wherein the production of the high yield containerboard comprises the use of NaHSOs and NaOH. Preferably the amounts of 40-60 kg of NaHSOs and 25-45 kg of NaOH per ton of chips, are used.
  • the cellulose fibres of the first group and/or the second group comprise softwood fibres.
  • the cellulose fibres consists of softwood fibres. It may as well be preferred that the cellulose fibres comprises spruce fibres, for example from picea abies.
  • the cellulose fibres may also comprises pine cellulose fibres, for example from pinus sylvestris.
  • the advantage of using softwood fibres is that they give a strong high yield containerboard, for example due to longer fibres than hardwood fibres.
  • Spruce fibres, in particular picea abies grows in forests that are easy to regrow and gives very little impact to the environment when farmed.
  • Pine fibres have the same advantages and pinus sylvestris is easy to regrow as well.
  • a high yield containerboard wherein the surface weight of the high yield containerboard is comprised in the range of 40-140 g/m 2 , preferably 50-130 g/m 2 , even more preferred in the range of 60-120 g/m 2 , most preferred 60-100 g/m 2 .
  • the high yield containerboard is particularly favourable for the balance between strength and amount of cellulose fibres used for the high yield.
  • a high yield containerboard wherein the high yield containerboard comprises at least 20 dry weight % of the first group of cellulose fibres in the high yield containerboard, preferably at least 40 % or at least 60 %, or at least 70 %, or at least 80 %, or at least 90 % or at least 95 % or 100 %, in dry weight of the cellulose fibres of the first group.
  • the advantage with increased amount of the first group of fibres is that each advantage mentioned above is improved. More high yield cellulose fibres will be in the high yield containerboard. This will in turn improve the overall yield for the high yield containerboard, as compared with the amount of wood start material. Also there can be advantages in terms of reduction of the use of chemicals for providing the free cellulose fibres.
  • a high yield containerboard wherein the tensile strength is comprised in the range of 3-20 kN/m, preferably 3-15 kN/m in machine direction and/or 3-7 kN/m, preferably 1-7 kN/m in cross machine direction.
  • the burst index is comprised in the range of 1-500 kPa*m 2 /g, preferably 1-450 kPa*m 2 /g, even more preferred 1-430 kPa*m 2 /g.
  • a high yield containerboard wherein the high yield containerboard comprises surface sizing applied on at least on side.
  • a high yield containerboard wherein it further comprises micro fibrillated cellulose and/or nano fibrillated cellulose.
  • the properties of the micro/nano fibrillated cellulose can help improve bonding in the high yield containerboard, in particular bonding can be improved at a high share of the first group of cellulose fibres together. This means improved mechanical properties, with less cellulose fibres needed for the same properties. Thus if it is desired to improve the strength properties it is possible to add MFC/NFC.
  • a high yield containerboard wherein the cellulose fibres of the first group has a yield when compared with the starting material, preferably wood chips, of above 80 dry weight %.
  • a high yield containerboard wherein the SCT in machine direction is comprised in the range of 1,5 -15 kN/m, and/or the SCT in cross direction is comprised in the range of 1-10 kN/m.
  • the high yield containerboard produced is a high yield containerboard according to the aspects above.
  • a containerboard product according to claim 13, packaging material according to claim 14 and a container for goods according to claim 15.
  • Fig. 1 discloses a high yield containerboard according to an aspect of the disclosure.
  • FIG. 2 A high yield containerboard according to one aspect of the disclosure included into a corrugated containerboard.
  • Fig. 3 A container including the high yield containerboard according to the present disclosure.
  • Fig. 4 Example of a process for producing the cellulose fibres of group 1.
  • the present disclosure is related to a high yield containerboard.
  • the high yield containerboard is a cellulose fibre product that is entirely intended to be used as a liner and/or a fluting, for example in a corrugated containerboard product.
  • the corrugated containerboard product can be made in various ways. In general the high yield containerboard is applied as one layer in a containerboard product. Even if the preferred use is in a corrugated containerboard product, it can be used also in a multilayer product where the corrugated medium is replaced with another layer. Other layers can be made of any material, for example a resin material or a layer contain metal. There may be added a fluting layer to the containerboard product, i.e.
  • corrugated layer of cellulose fibres meaning a layer of undulating containerboard.
  • the fluting layer can be glued directly onto the high yield containerboard.
  • the corrugated containerboard product can be a multilayer product. In general at least two layers is provided in a containerboard product, that is at least one liner layer and one undulating fluting layer. But in general it is suitable to have all liner layers of a containerboard product or packaging material to be made from the high yield containerboard.
  • Containerboard being defined as a raw material intended to be used in a corrugated board product.
  • Figure 1 discloses a high yield containerboard 1 according to the disclosure.
  • the liner la is made of the high yield containerboard 1. This liner la is glued to an undulating fluting layer 20 of fluting material.
  • the high yield containerboard 1 has two sides 2, 3.
  • the high yield containerboard 1 may be homogenous in the direction from the first side 2 to the second side 3, i.e. with normal variations in the cellulose fibre formation.
  • High yield in high yield containerboard means that the high yield containerboard 1 comprises cellulose fibres that has not had the lignin removed to any greater extent. I.e. the major part of the defibration, where the cellulose fibres are separated from each other, is made through mechanical processes. In producing a pulp with this type of cellulose fibres the basic material is wood chips.
  • the undulating layer 20 may be made with the high yield containerboard 1.
  • the same figure 2 is relevant for a fluting 20 made from the containerboard 1.
  • the containerboard 1 when used for fluting should be adapted for the undulating application.
  • a lower basis weight may apply than for the corresponding liner la, lb.
  • the high yield containerboard 1 comprises a first group of cellulose fibres.
  • the first group of fibres thus being produced by mechanical defibration of wood chips. Mechanical defibration is achieved through a mill, a refiner or the like.
  • the first group is comprising cellulose fibres chosen from a group consisting of: any kind of mechanical pulp MP fibres e.g. refiner mechanical pulp RMP cellulose fibres, pressurized refiner mechanical pulp PRMP cellulose fibres, thermomechanical pulp TMP cellulose fibres, chemithermomechanical pulp CTMP cellulose fibres, all kinds of alkaline peroxide mechanical pulp APMP cellulose fibres, pressure groundwood PGW cellulose fibres and PRC-APMP cellulose fibres, and/or chemimechanical pulp CMP cellulose fibres,
  • mechanical pulp MP fibres e.g. refiner mechanical pulp RMP cellulose fibres, pressurized refiner mechanical pulp PRMP cellulose fibres, thermomechanical pulp TMP cellulose fibres, chemithermomechanical pulp CTMP cellulose fibres, all kinds of alkaline peroxide mechanical pulp APMP cellulose fibres, pressure groundwood PGW cellulose fibres and PRC-APMP cellulose fibres, and/or chemimechanical pulp CMP cellulose fibres,
  • At least 16 % of dry weight of the cellulose fibres of the high yield liner are made according to any of the mechanical processes above. That is 16 % dry weight compared with total dry weight of cellulose fibres. Any amount, below 16 % of the first group of fibres is not enough to achieve the desired advantages for the present disclosure, and would have disadvantageous effects in terms of the amount of wood material (chips) needed for same the desired amount of cellulose fibres (in weight).
  • cellulose fibres that may be comprised in the high yield containerboard 1.
  • This group of cellulose fibres that primarily are not separated by means of mechanical processes. Instead the main process step for separation of the cellulose fibres from each other is based on partial chemical dissolution of the wood material, that is comprised in wood.
  • the cellulose fibres are chosen from a group consisting of chemical cellulose fibres, sulphate cellulose fibres, sulphite cellulose fibres, OCC and/or recycled chemical cellulose fibres.
  • the amount sums up to a total dry weight of 100 % of cellulose fibres. If the amount of fibres of the first group is below 100 % dry weight, the remainder of fibres are either coming from the second group of fibres, or from both the second group of fibres and other fibres that not belong to the first or second group. It is also thinkable that only first group fibres and other fibres are mixed.
  • fibres of first and second groups are discussed. With fibres is meant in general wood material, thus both long fibres and shorter fibre fragments and preferably fines of the particular group should be included in this wording.
  • the cellulose fibres of the first group may come from virgin cellulose fibres. With virgin it is to be defined fibres that have their origin from wood chips. Thus any recycled cellulose fibre should not be construed as belonging to the group of virgin cellulose fibres.
  • the virgin fibres need not come from wood chips per se. It is thinkable that the cellulose fibres is not coming from what would be termed wood chips.
  • the cellulose fibres may be softwood cellulose fibres. Softwood provides good properties in the high yield containerboard of the present disclosure. As compared with hardwood fibres, softwood fibres provide better strength properties due to longer fibres on average.
  • the soft wood cellulose fibres may for example come from Nordic Softwood.
  • One particular fibre may be spruce fibres. The type of spruce could be picea abies, which grows well in colder climates.
  • the softwood cellulose fibres may also for example be pine cellulose fibres. The pine cellulose fibres may come from pinus sylvestris.
  • the surface weight may be comprised within the range of 40-140 g/m 2 .
  • the aim of the disclosure is to present an effective usage of the wood material put into the production of a high yield liner.
  • unnecessary high surface weights of the high yield liner is preferred to be avoided, as this will mean that an unnecessary large amount of cellulose fibres are used. It is equally important not apply a too low surface weight as this will give very poor strength properties.
  • a more narrow range 50-130, or 60- 120 g/m 2 A good range that applies for many applications would be 60-100 g/m 2 .
  • the weight 100 g/m 2 has been found to be very satisfactory in terms of the amount of fibres used and the sufficient strength properties for the high yield containerboard 1.
  • the lower end of the range of the basis weight is better for a high yield fluting product 20, and the upper range of the basis weight is better for a high yield liner la.
  • the first group of cellulose fibres may be increased. For example 20 % of cellulose fibres of the first group gives less use of the input wood material for a given weight of high yield containerboard, i.e. yield increases. Other amounts can be 40, 50, 60, 70, 80, 90, 95 or 100 % of fibres of the first group with an increased yield and an excellent yield, despite using mechanical pulp fibres that are generally known as not to give sufficiently good strength properties, compared with the second group of cellulose fibres.
  • a machine direction tensile strength is preferred to be in the range of 3-20 kN/m, or more narrow ranges, 3-15, 3-7, 1-7 kN/m and a tensile strength in cross machine direction 3-7 kN/m, preferably 1-7 kN/m is preferred.
  • burst strength is important.
  • the high yield containerboard may a burst strength is comprised in the range of 1-500 kPa*m 2 /g, preferably 1-450 kPa*m 2 /g, even more preferred 1-430 kPa*m 2 /g.
  • a higher burst strength is important when a container is made, as shown in fig.2. It should be understood that burst strength preferably should be in the upper part of the range for a high yield liner product la, than for a high yield fluting product 20.
  • a surface sizing layer 10, Fig. 2 may be applied.
  • the surface sizing layer 10 may comprise starch.
  • a high yield liner la may have only surface sizing applied to one side, but a high yield fluting product 20 is preferred to have surface size applied to both sides.
  • the high yield containerboard 1 can also comprise an amount of MFC, micro fibrillated cellulose, i.e. NFC nano fibrillated cellulose. Addition of MFC/NFC will further increase the strength of the high yield containerboard 1, i.e. it will function as a glue and adhere the cellulose fibres to each other.
  • the yield of the cellulose fibres of the first group may be 80 dry weight % or more compared with the dry weight of the wood chips starting material. This is a high yield in terms of the present disclosure. Also higher yield as 90 % or 95 % or close to 100 % is thinkable.
  • the present disclosure is also related to a method for producing a high yield containerboard comprising the steps of:
  • the containerboard product 100 has in this case two liner layers la, lb.
  • the liner layers la, lb are made from the high yield containerboard 1 as described above.
  • the middle layer 20 is a corrugated fluting layer.
  • the second liner layer lb need not be the high yield containerboard, it could be another liner made according to traditional technology. I should be understood that the containerboard product 100 could be made in numerous ways, i.e. with only one liner layer and one fluting layer. It could also be a sandwich design with a group of liner layers, and a group of fluting layers 20.
  • the fluting layer of a containerboard product is made from a different containerboard, but at least one liner comprised in the containerboard product is made from the containerboard 1 of the present disclosure, the reversed being also thinkable, i.e. that only a corrugated fluting layer 20 is made from the high yield containerboard 1 of the present disclosure.
  • the packaging material comprising the high yield containerboard 1 as described above.
  • Figure 3 discloses a container 1000, which comprises the high yield containerboard of the present disclosure.
  • a container 1000 will be very efficient in terms of yield of the input wood material into the process of producing a container for transporting, storing, displaying and/or protection of goods.
  • Spruce chips were heated in a bin 33 with steam 21 for two minutes at atmospheric pressure and thereafter introduced to a pressurized heating screw 22 and heated with steam 21 at 1.5 bar for 15 seconds. After the preheating, the chips were compressed in an Impressafiner 30 and after the compression, chips were submerged in a solution of sodium bisulphite (NaHSOs) and caustic (NaOH) at 23 with the doses 50 kg bisulphite and 35 kg caustic per ton of chips. The impregnated chips were fed through a rotary valve 24 into a steam heated screw conveyor (digester) 25. The temperature in the digester was 175 °C and the retention time was 10 minutes.
  • NaHSOs sodium bisulphite
  • NaOH caustic
  • the thick stock of EXAMPLE 1 was post-refined in a JC01 low consistency refiner at around 3.5 % consistency to around 350 ml freeness.
  • the refiner was equipped with PSED segments. Directly after the post refining the stock was diluted to 2.5 % consistency in the machine chest.
  • the high yield containerboard was produced in a containerboard machine equipped as follows:
  • Forming section Metso OptiFormer Gap with loadable blades (forming roll gap angle: 20°).
  • Basis weight 65 - 110 gsm Retention aid: Fennopol K3400, dosage 150 g/t
  • the strength properties fulfils a sufficiently good criterion or use as a high yield containerboard. I.e. we have a reasonable good tensile strength in machine direction and somewhat lower in cross direction, but still sufficient.
  • the thick stock was a blend of 60 % dry weight TMP pulp and 40 % dry weight of NBSK pulp.
  • the Canadian Standard Freeness was 142 ml and the fibre length measured with PQM was 1.68 mm.
  • the above example discloses a first group pulp, TMP, and a second group pulp NBSK (Northern Bleached Softwood Kraft).
  • the ratio of the mix is 60/40 of TMP/NBSK.
  • the first group pulp was 60 % dry weight and the second group pulp was 40 % dry weight.
  • Example 4 About half of the decreased tensile strength can be explained by the lower basis weight of Example 4 compared with Example 2.
  • the further decrease in Tensile strength is due to the mix of Fibre being more unfavourable than in Example 1. I.e. the TMP fibre performs less good than the CMP fibre of Example 1-2. And the second group fibre of Example 4 does not compensate for this. Still the high yield containerboard performs sufficiently well.
  • High yield containerboard 80 gsm, 60 % TMP and 40 % Kraft fibres Solid starch: 15%

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)
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Abstract

L'invention concerne un papier pour carton ondulé à haut rendement (1) comprenant un premier groupe de fibres de cellulose de pâte mécanique. Le papier pour carton ondulé à haut rendement a une teneur d'au moins 16 % en poids sec du premier groupe de fibres. L'invention concerne également un procédé de production du carton pour papier ondulé à haut rendement. L'invention comprend en outre un produit en carton pour papier ondulé (100), un matériau d'emballage et un contenant (1000) produit avec le papier pour carton ondulé à haut rendememnt.
PCT/SE2021/050970 2020-10-02 2021-10-01 Papier pour carton ondulé à haut rendement WO2022071871A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21791489.4A EP4222311A1 (fr) 2020-10-02 2021-10-01 Papier pour carton ondulé à haut rendement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2051168-9 2020-10-02
SE2051168A SE546114C2 (en) 2020-10-02 2020-10-02 High yield containerboard and the production thereof

Publications (1)

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WO2022071871A1 true WO2022071871A1 (fr) 2022-04-07

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PCT/SE2021/050970 WO2022071871A1 (fr) 2020-10-02 2021-10-01 Papier pour carton ondulé à haut rendement

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EP (1) EP4222311A1 (fr)
SE (1) SE546114C2 (fr)
WO (1) WO2022071871A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000014333A1 (fr) * 1998-09-03 2000-03-16 Stora Kopparberg Bergslags Ab (Publ) Papier ou carton stratifie et son procede de fabrication
WO2017204723A1 (fr) * 2016-05-23 2017-11-30 Holmen Ab Procédé de fourniture d'une composition de fibres de papier
WO2018054957A1 (fr) * 2016-09-21 2018-03-29 Hoeglund Hans Produit en papier ou en carton comprenant au moins un pli contenant une pâte à haut rendement et son procédé de production
WO2020003128A1 (fr) * 2018-06-27 2020-01-02 Stora Enso Oyj Carton double léger destiné à un carton ondulé
WO2020003129A1 (fr) * 2018-06-27 2020-01-02 Stora Enso Oyj Couche de papier de couverture et papier de courverture léger pour carton ondulé

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000014333A1 (fr) * 1998-09-03 2000-03-16 Stora Kopparberg Bergslags Ab (Publ) Papier ou carton stratifie et son procede de fabrication
WO2017204723A1 (fr) * 2016-05-23 2017-11-30 Holmen Ab Procédé de fourniture d'une composition de fibres de papier
WO2018054957A1 (fr) * 2016-09-21 2018-03-29 Hoeglund Hans Produit en papier ou en carton comprenant au moins un pli contenant une pâte à haut rendement et son procédé de production
WO2020003128A1 (fr) * 2018-06-27 2020-01-02 Stora Enso Oyj Carton double léger destiné à un carton ondulé
WO2020003129A1 (fr) * 2018-06-27 2020-01-02 Stora Enso Oyj Couche de papier de couverture et papier de courverture léger pour carton ondulé

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
EK MONICA, GORAN GELLERSTEDT GUNNAR HENRIKSSON: "Pulping Chemistry and Technology", 1 January 2009 (2009-01-01), pages 1 - 22, XP093119918
HOLIK HERBERT: "Handbook of Paper and Board", HANDBOOK OF PAPER AND BOARD SECOND REVISED AND ENLARGED EDITION VOLUME 1, 1 January 2013 (2013-01-01), pages 745, XP093119646
TERLAND OLE, FELLERS CHRISTER: "Potential strength advantages with provision of paper in plies - CTMP and recycled corrugated board in liner", STH REPORT SERIES C NO. 134, 1 July 1986 (1986-07-01), pages 1 - 34, XP093119934

Also Published As

Publication number Publication date
EP4222311A1 (fr) 2023-08-09
SE2051168A1 (en) 2022-04-03
SE546114C2 (en) 2024-05-28

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