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NZ745660B2 - Paper sheet, corrugated paper and a process for the manufacture thereof - Google Patents
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NZ745660B2 - Paper sheet, corrugated paper and a process for the manufacture thereof - Google Patents

Paper sheet, corrugated paper and a process for the manufacture thereof Download PDF

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Publication number
NZ745660B2
NZ745660B2 NZ745660A NZ74566017A NZ745660B2 NZ 745660 B2 NZ745660 B2 NZ 745660B2 NZ 745660 A NZ745660 A NZ 745660A NZ 74566017 A NZ74566017 A NZ 74566017A NZ 745660 B2 NZ745660 B2 NZ 745660B2
Authority
NZ
New Zealand
Prior art keywords
additive
paper
corrugating
sheet
cellulose
Prior art date
Application number
NZ745660A
Other versions
NZ745660A (en
Inventor
Andrew Conn
Rafik Faltas
Jim Selway
Original Assignee
Opal Packaging New Zealand Limited
Filing date
Publication date
Application filed by Opal Packaging New Zealand Limited filed Critical Opal Packaging New Zealand Limited
Priority claimed from PCT/AU2017/050273 external-priority patent/WO2017165919A1/en
Publication of NZ745660A publication Critical patent/NZ745660A/en
Publication of NZ745660B2 publication Critical patent/NZ745660B2/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2845—Details, e.g. provisions for drying, moistening, pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2886—Additionally reinforcing, e.g. by applying resin or wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/36—Moistening and heating webs to facilitate mechanical deformation and drying deformed webs
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/12—Layered products comprising a layer of metal comprising metal 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
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/12—Coating on the layer surface on paper 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/24—Organic non-macromolecular coating
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/408—Matt, dull surface
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/542—Shear strength
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/548—Creep
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/73—Hydrophobic
    • 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
    • B32B2439/40—Closed containers
    • B32B2439/62—Boxes, cartons, cases
    • 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
    • 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
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • 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
    • 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
    • D21H17/25—Cellulose
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape
    • 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
    • D21H27/32—Multi-ply with materials applied between the sheets

Abstract

The present invention is directed towards improving the performance of corrugating paper. The present invention provides a corrugating paper and a process of making the corrugating paper that improves the high humidity load carrying capacity of the corrugated paper. The corrugating paper includes an additive including starch and platelet shaped nanoparticles

Claims (30)

1. A corrugating paper treated with an additive including starch and at least 15wt% platelet shaped nanoparticles, the nanoparticles having a thickness in the range of 1 to 5nm and bond to any one or a 5 combination of: starch of the corrugating paper, adhesives present in the corrugating paper, cellulose of the corrugating paper, and fibre of the corrugating paper, wherein the additive increases the high humidity load carrying capacity from 1 to 13% compared to an equivalent corrugating paper without the additive, in which the 10 relative humidity is at least 50%.
2. A corrugating paper treated with an additive including starch and at least 15wt% platelet shaped nanoparticles having a thickness in the range of 1 to 5nm, including: 15 at least two ply layers that are joined together, and the additive being located between the ply layers that enhances the bond between the layers joined together, wherein the nano- particles bond to any one or a combination of fibre of the ply layers, cellulose and starch of the ply layers, wherein the 20 additive increases the high humidity load carrying capacity from 1 to 13% compared to an equivalent corrugating paper without the additive, in which the relative humidity is at least 50%. 25
3. The corrugating paper according to either claim 1 or 2, wherein the nano-particles include cellulose nano-particles or derivatives thereof, including nanocrystalline cellulose, cellulose nanocrystals, cellulose whiskers, nanofibrillated cellulose, cellulose nanofibrils, microfibrillated cellulose, carboxymethylated 30 cellulose, microcrystalline cellulose, and cellulose filaments.
4. The corrugating paper according to any one of the preceding claims, wherein the nano-particles include clay nano-particles. 35
5. The corrugating paper according to any one of the preceding claims, wherein the additive includes a combination of clay nano- particles, cellulose nano-particles in which a weight ratio of clay 21141152_1 (GHMatters) P96760.NZ nanoparticles and cellulose nanoparticles is in the ranges of 10 to 90 : 90 to 10 respectively.
6. The corrugating paper according to any one of the preceding 5 claims, wherein the additive increases the ring crush strength from 1 to 8% compared to an equivalent corrugating paper without the additive.
7. The corrugating paper according to any one of the preceding 10 claims, wherein the additive slows time dependent deformation (creep) of the corrugating paper that is subject to a load in a high humidity/moisture environment in which the relative humidity is at least 50%, compared to an equivalent corrugating paper without the additive.
8. The corrugating paper according to any one of the preceding claims, wherein the nano-particles are distributed throughout the corrugating paper. 20
9. The corrugating paper according to any one of the preceding claims, wherein the corrugating paper has one or more ply layers, and the nano-particles are distributed throughout the or each ply layer. 25
10. The corrugating paper according to any one of the preceding claims, wherein the nano-particles are applied to the outer faces of the corrugating paper.
11. A corrugating paper treated with an additive including starch 30 and at least 15wt% platelet shaped nanoparticles having a thickness in the range of 1 to 5nm including: at least two ply layers that are joined together to form the corrugating paper, and the additive being is present in the corrugating paper and 35 between the ply layers, wherein the nano-particles bond to any one or a combination of fibre of the ply layers, cellulose and starch of the ply layers, 21141152_1 (GHMatters) P96760.NZ wherein the additive increases the high humidity load carrying capacity from 1 to 13% compared to an equivalent corrugating paper without the additive, in which the relative humidity is at least 50% and facilitates relative movement of the ply 5 layers to prevent or reduce fracturing of the join between the ply layers during corrugation of the sheet.
12. The corrugating paper according to claim 11, wherein the additive further includes a plasticizing agent that can form a 10 thermoplastic with starch.
13. The corrugating paper according to claim 12, wherein the plasticizing agent includes at least one of glycerol or sorbitol. 15
14. The corrugating paper according to any one of claims 11 to 13, wherein the additive slows time dependent deformation (creep) of the corrugating paper that is subject to a load in a high humidity/moisture environment in which the relative humidity is at least 50%, compared to an equivalent corrugating paper without the 20 additive.
15. The corrugating paper according to any one of claims 11 to 14, wherein the additive is located at the interface between the ply layers, and penetrates into the plies to a degree.
16. The corrugating paper according to any one of claims 11 to 15, wherein the additive is located entirely through each ply layer.
17. The corrugating paper according to any one of claims 11 to 16, 30 wherein the additive is added to a paper pulp slurry feed to the headbox of a papermaking machine so that the additive is distributed through the ply layer at the headbox.
18. The corrugating paper according to any one of claims 11 to 17, 35 wherein the additive is applied to a face of the ply layer that is discharged from a paper machine headbox. 21141152_1 (GHMatters) P96760.NZ
19. A process of manufacturing a corrugating paper from a paper sheet, the process including the steps of: forming the paper sheet including one or more than one ply layer; 5 treating the paper sheet with an additive including starch and at least 15wt% platelet shaped nanoparticles having a thickness in the range of 1 to 5nm; and corrugating the sheet into a corrugating paper; wherein the nano-particles bond to any one or a combination of 10 fibre of the ply layers, cellulose and starch of the ply layers, and the additive increases the high humidity load carrying capacity from 1 to 13% compared to an equivalent corrugating paper without the additive, in which the relative humidity is at least 50% and facilitates relative movement of 15 internal sheet structure and/or the ply layers to prevent or reduce fracturing of the internal structure and/or join between the ply layers during corrugation of the sheet.
20. The process according to claim 19, wherein the process 20 includes allowing the paper sheet to cool, and thereafter heating the paper sheet prior to and/or during the corrugating step.
21. The process according to claim 19 or 20, wherein the step of corrugating the paper sheet into a corrugating paper includes 25 passing the paper sheet between a pair of co-operating rollers having mating surfaces with crests and troughs that impart a corrugated profile.
22. The process according to any one of claims 19 to 21, wherein 30 the step of forming the sheet including one or more ply layers includes creating a paper pulp slurry containing the paper fibre, and delivering the slurry onto a travelling wire from a headbox at the wet end of a paper making machine and the step of incorporating the additive in the paper sheet includes any one or a combination of 35 the following: 21141152_1 (GHMatters) P96760.NZ i) adding the additive to the paper pulp slurry feed to the headbox of a papermaking machine so that the additive is distributed through the ply layer of the headbox; or ii) applying the additive to a face of the ply layer that is 5 discharged from a paper machine head box onto the wire.
23. The process according to any one of claims 19 to 22, wherein the step of treating the paper sheet with the additive includes forming a pool including the additive and conveying the paper sheet 10 through the pool.
24. The process according to any one of claims 19 to 23, wherein the step of treating the paper sheet with the additive includes controlling the penetration depth of the additive into the paper 15 sheet.
25. A process of manufacturing a corrugating paper, the process including: treating two base sheets with an additive including starch and 20 at least 15wt% platelet shaped nanoparticles having a thickness in the range of 1 to 5nm to locate the additive between the two base sheets; joining the base sheets together with the additive therebetween to form a medium; and 25 corrugating the medium into the corrugating paper; wherein the additive enhances the bond between the sheets and the nano-particles bond to any one or a combination of the fibre of the base sheets or starch of the base sheets, and increases the high humidity load carrying capacity from 1 to 30 13% compared to an equivalent base sheet without the additive, in which the relative humidity is at least 50%.
26. The process according to claim 25, wherein the additive is a wet additive. 21141152_1 (GHMatters) P96760.NZ
27. The process according to claim 25, wherein the additive is applied to one or both of the joined faces of the sheets prior to the sheets being joined together. 5
28. The process according to claim 27, wherein the additive is applied by means of either: i) spraying the additive onto the base sheet, or ii) applying the additive by means of roller application.
29. The process according to any one of claims 25 to 28, wherein 10 corrugating the medium into the corrugating paper includes passing the medium between a pair of co-operating rollers having mating surfaces with crests and troughs that impart a corrugated profile before drying the additive. 15
30. The process according to any one of claims 25 to 29, wherein the process includes applying at least one liner board to the corrugating paper after the corrugating step. 21141152_1 (GHMatters) P96760.NZ
NZ745660A 2017-03-30 Paper sheet, corrugated paper and a process for the manufacture thereof NZ745660B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AU2016901175A AU2016901175A0 (en) 2016-03-30 Paper sheet and a process for the manufacturing thereof
AU2016901174A AU2016901174A0 (en) 2016-03-30 Paper sheet and a process for the manufacture thereof
AU2016901173A AU2016901173A0 (en) 2016-03-30 Corrugated medium and a process for the manufacture thereof
PCT/AU2017/050273 WO2017165919A1 (en) 2016-03-30 2017-03-30 Paper sheet, corrugated paper and a process for the manufacture thereof

Publications (2)

Publication Number Publication Date
NZ745660A NZ745660A (en) 2024-09-27
NZ745660B2 true NZ745660B2 (en) 2025-01-07

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