WO2022005768A1 - Improved cellulose-based materials and containers made therefrom - Google Patents

Improved cellulose-based materials and containers made therefrom Download PDF

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Publication number
WO2022005768A1
WO2022005768A1 PCT/US2021/038022 US2021038022W WO2022005768A1 WO 2022005768 A1 WO2022005768 A1 WO 2022005768A1 US 2021038022 W US2021038022 W US 2021038022W WO 2022005768 A1 WO2022005768 A1 WO 2022005768A1
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WO
WIPO (PCT)
Prior art keywords
cellulose
based material
clause
comparative
container
Prior art date
Application number
PCT/US2021/038022
Other languages
English (en)
French (fr)
Inventor
Sadakat HUSSAIN
James D. REGEL
Original Assignee
International Paper Company
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 International Paper Company filed Critical International Paper Company
Priority to EP21740393.0A priority Critical patent/EP4172414A1/en
Priority to CN202180043866.9A priority patent/CN115702275A/zh
Publication of WO2022005768A1 publication Critical patent/WO2022005768A1/en
Priority to CONC2022/0017874A priority patent/CO2022017874A2/es

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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
    • D21H11/10—Mixtures of chemical and mechanical pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/12—Making corrugated paper or board
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • D21H17/375—Poly(meth)acrylamide
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • D21H17/55—Polyamides; Polyaminoamides; Polyester-amides
    • 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
    • D21H21/16—Sizing or water-repelling 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
    • D21H21/14—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
    • D21H21/14—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
    • D21H21/20—Wet strength 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper

Definitions

  • the present disclosure relates to cellulose-based material, and particularly to containers utilizing the cellulose-based material. More particularly, the present disclosure relates to cellulose-based material comprising strength-enhancing preparations and improved containers made with the strength-enhanced cellulose-based materials.
  • Containers are used to store, ship, and protect a multitude of products from damage.
  • such containers may be stacked on top of each other during general use, thus exposing certain containers within the stack to significant weight loads.
  • the strength of the containers and the materials that comprise the containers is of extreme importance.
  • containers comprising cellulosic fibers are subject to swelling due to the absorbance of water by the fibers, thus weakening the containers.
  • containers used in activities that have a high relative humidity e.g., the food supply chain
  • a cellulose-based material in accordance with the present disclosure includes cellulosic fibers, wherein the cellulosic fibers are treated with i) a dry strength chemistry preparation and ii) a wet strength chemistry preparation. Furthermore, the cellulose-based material in accordance with the present disclosure can be utilized in containers as described herein.
  • the cellulose-based materials and containers of the present disclosure provide several advantages and improvements compared to the state of the art.
  • the cellulose-based material including cellulosic fibers that are treated with both a dry strength chemistry preparation and a wet strength chemistry preparation provides significant strength improvement (i.e., a significant reduction in strength loss) that is observed in both the cellulose- based material and containers made using the cellulose-based material.
  • the improvement in strength can be observed at conditions of high relative humidity in order to provide significant advantages for activities performed in such humid conditions.
  • the cellulose-based materials and containers of the present disclosure are recyclable, repulpable, and capable of being recycled, which are highly desired from an environmental perspective.
  • a synergistic effect in strength improvement can be observed for containers prepared using a combination of a dry strength chemistry preparation and a wet strength preparation in the cellulose-based materials. This synergistic effect was surprising and unexpected.
  • a cellulose-based material comprising cellulosic fibers.
  • the cellulosic fibers are treated with i) a dry strength chemistry preparation and ii) a wet strength chemistry preparation.
  • a container comprising a cellulose-based material comprising cellulosic fibers is provided.
  • the cellulosic fibers are treated with i) a dry strength chemistry preparation and ii) a wet strength chemistry preparation.
  • Fig. l is a view of an exemplary containerboard formed from the cellulose-based material described herein. As shown in Fig. 1, two linerboard compositions are provided for the outer layers of the containerboard and one medium composition is provided for the fluted inner layer that is sinusoidal in shape.
  • Fig. 2 shows that a higher BCT at 85 % relative humidity for containers prepared using a combination of a dry strength chemistry preparation plus a wet strength preparation in the cellulose-based materials.
  • Fig. 3 shows a synergistic strength improvement was observed for containers prepared using a combination of a dry strength chemistry preparation plus a wet strength preparation in the cellulose-based materials.
  • Fig. 4 shows that inclusion of a dry strength chemistry preparation plus a wet strength chemistry preparation demonstrated an increase in SCT when normalized to 36 lbs/1000 ft 2 compared to other cellulose-based materials that did not include a dry strength chemistry preparation.
  • Fig. 5 shows a synergistic strength improvement was observed for containers prepared using a combination of a dry strength chemistry preparation plus a wet strength preparation in the cellulose-based materials.
  • a cellulose-based material comprises cellulosic fibers, wherein the cellulosic fibers are treated with i) a dry strength chemistry preparation and ii) a wet strength chemistry preparation.
  • the cellulose-based material is a paper-based material.
  • the cellulose-based material is paper.
  • the cellulose-based material is a paper board.
  • the cellulose-based material is a medium.
  • a “medium” is well known in the art as an inner layer of a containerboard.
  • a medium may be fluted and/or sinusoidal in shape.
  • the cellulose-based material is a liner.
  • a “liner” is well known in the art as an outer layer of a containerboard.
  • the cellulose-based material is a containerboard.
  • the cellulose-based material is recyclable.
  • cellulose-based materials are known in the art to be certified for recycling.
  • FBA Fibre Box Association
  • the cellulosic fibers comprise virgin fibers. In an aspect, the cellulosic fibers comprise recycled fibers. In an aspect, the cellulosic fibers comprise a combination of virgin fibers and recycled fibers. In an aspect, the cellulosic fibers are capable of being recycled. In an aspect, the cellulose-based material is capable of being recycled. [0018] The combination of virgin fibers and recycled fibers may fall within one of several different ranges.
  • the combination may be one of the following ranges (in which the total percentage is 100%): about 1% to about 99% virgin fibers and about 1% to about 99% recycled fibers, about 5% to about 95% virgin fibers and about 5% to about 95% recycled fibers, about 10% to about 90% virgin fibers and about 10% to about 90% recycled fibers, about 15% to about 85% virgin fibers and about 15% to about 85% recycled fibers, about 20% to about 80% virgin fibers and about 20% to about 80% recycled fibers, about 25% to about 75% virgin fibers and about 25% to about 75% recycled fibers, about 30% to about 70% virgin fibers and about 30% to about 70% recycled fibers, about 35% to about 65% virgin fibers and about 35% to about 65% recycled fibers, about 40% to about 60% virgin fibers and about 40% to about 60% recycled fibers, about 45% to about 55% virgin fibers and about 45% to about 55% recycled fibers, about 48% to about 52% virgin fibers and about 48% to about 52% recycled fibers, and about 50% virgin fibers and about 50% recycled
  • the dry strength chemistry preparation comprises an aldehyde functionalized polymer.
  • the dry strength chemistry preparation comprises glyoxalated polyacrylamide (GPAM).
  • GPAM can be supplied, for example, as Solenis Hercobond Plus 555 (aka BASF Luredur Plus 555), as Solenis Hercobond Plus HC (aka BASF Luredur Plus HC), or as other GPAM formulations known in the art.
  • the GPAM is applied to the cellulosic fibers between 1-16 dry lbs/ton. In an embodiment, the GPAM is applied to the cellulosic fibers between 2-8 dry lbs/ton. In an embodiment, the GPAM is applied to the cellulosic fibers at 2 dry lbs/ton. In an embodiment, the GPAM is applied to the cellulosic fibers at 4 dry lbs/ton. In an embodiment, the GPAM is applied to the cellulosic fibers at 6 dry lbs/ton. In an embodiment, the GPAM is applied to the cellulosic fibers at 8 dry lbs/ton.
  • the wet strength chemistry preparation comprises a polyamide resin.
  • the polyamide resin is a polyamidoamine epihalohydrin resin.
  • the polyamide resin is selected from the group consisting of EPI-Poly amide resin, Polyamide- Epichlorohydrin resin (PAE), and Epichlorohydrin polyamide resin.
  • the polyamide resin is Polyamide-Epichlorohydrin resin (PAE).
  • the wet strength chemistry preparation can be supplied, for example, as Kymene 1500LV, as Nalco 63642, or as other wet strength chemistry formulations known in the art.
  • the polyamide resin is applied to the cellulosic fibers between 1-
  • the polyamide resin is applied to the cellulosic fibers between 2- 16 dry lbs/ton. In an aspect, the polyamide resin is applied to the cellulosic fibers between 2- 8 dry lbs/ton. In an aspect, the polyamide resin is applied to the cellulosic fibers at 2 dry lbs/ton. In an aspect, the polyamide resin is applied to the cellulosic fibers at 4 dry lbs/ton. In an aspect, the polyamide resin is applied to the cellulosic fibers at 6 dry lbs/ton. In an aspect, the polyamide resin is applied to the cellulosic fibers at 8 dry lbs/ton.
  • the cellulosic fibers are treated with a sizing agent.
  • the sizing agent is an internal sizing agent.
  • the sizing agent is a surface sizing agent.
  • the sizing agent is alkenyl succinic anhydride (ASA).
  • the sizing agent is rosin.
  • the sizing agent is alkyl ketene dimer (AKD).
  • the cellulosic fibers are treated with the dry strength chemistry preparation and the wet strength chemistry preparation at the same time.
  • the cellulosic fibers are treated with the dry strength chemistry preparation and the wet strength chemistry preparation sequentially, in either order.
  • the cellulosic fibers are treated with the dry strength chemistry preparation and the wet strength chemistry preparation separately.
  • the dry strength chemistry preparation and the wet strength chemistry preparation are combined prior to treating the cellulosic fibers.
  • the cellulosic fibers are treated with an enzymatic preparation.
  • the enzymatic preparation comprises a polypeptide having amylase activity.
  • the cellulosic fibers are not treated with an enzymatic preparation.
  • the cellulosic fibers are treated with an anionic surface preparation.
  • the anionic surface preparation is an anionic polyacrylamide.
  • the anionic surface preparation is a copolymer of acrylamide and unsaturated carboxylic acid monomers, being (meth)acrylic acid, maleic acid, crotonic acid, itaconic acid, or any combination thereof.
  • the cellulosic fibers are not treated with an anionic surface preparation.
  • the cellulose-based materials of the present disclosure may be determined to have certain properties.
  • the cellulose-based material has a basis weight.
  • a basis weight is generally understood in the paper making arts to represent the mass per unit of area of the cellulose-based materials.
  • the cellulose-based materials of the present disclosure can be contrasted to comparative cellulose-based materials having a similar basis weight in which the comparative cellulose-based materials lack the wet strength chemistry preparation, lack the dry strength chemistry preparation, or lack both the wet strength chemistry preparation and the dry strength chemistry preparation.
  • the cellulose-based material has a basis weight and a short- span compression strength (SCT).
  • SCT short- span compression strength
  • Means of evaluating compression strength of a cellulose- based material via SCT are well known in the art.
  • the SCT is greater than a comparative SCT for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the dry strength chemistry preparation and the wet strength chemistry preparation.
  • the greater SCT is observed at a dry relative humidity.
  • the greater SCT is observed at a high relative humidity.
  • a “high relative humidity” can refer to a relative humidity of 50% or greater, a relative humidity of 55% or greater, a relative humidity of 60% or greater, a relative humidity of 65% or greater, a relative humidity of 70% or greater, a relative humidity of 75% or greater, a relative humidity of 80% or greater, a relative humidity of 85% or greater, a relative humidity of 90% or greater, or a relative humidity of 95% or greater.
  • the SCT is greater than a comparative SCT for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the dry strength chemistry preparation.
  • the greater SCT is observed at a dry relative humidity. In an embodiment, the greater SCT is observed at a high relative humidity.
  • the SCT is greater than a comparative SCT for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the wet strength chemistry preparation.
  • the greater SCT is observed at a dry relative humidity. In an embodiment, the greater SCT is observed at a high relative humidity.
  • the dry strength chemistry preparation and the wet strength chemistry preparation provide a synergistic increase in SCT for the cellulose-based material in comparison to the comparative cellulose-based material.
  • the synergistic increase in SCT is observed at a dry relative humidity.
  • the synergistic increase in SCT is observed at a high relative humidity. The synergistic increase in SCT for the cellulose-based materials of the present disclosure is demonstrated in the subsequent examples and was unexpected.
  • the cellulose-based material has a basis weight and short- span compression strength index (SCT Index).
  • SCT Index short- span compression strength index
  • determining the SCT Index of a cellulose-based material is well known in the art by dividing the average SCT value of the cellulose-based material by the average basis weight of the cellulose-based material.
  • the SCT Index is greater than a comparative SCT Index for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the dry strength chemistry preparation and the wet strength chemistry preparation.
  • the greater SCT Index is observed at a dry relative humidity.
  • the greater SCT Index is observed at a high relative humidity.
  • the SCT Index is greater than a comparative SCT Index for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the dry strength chemistry preparation. In an embodiment, the greater SCT Index is observed at a dry relative humidity. In an embodiment, the greater SCT Index is observed at a high relative humidity. [0034] In an embodiment, the SCT Index is greater than a comparative SCT Index for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the wet strength chemistry preparation. In an embodiment, the greater SCT Index is observed at a dry relative humidity.
  • the greater SCT Index is observed at a high relative humidity.
  • the dry strength chemistry preparation and the wet strength chemistry preparation provide a synergistic increase in SCT Index for the cellulose-based material in comparison to the comparative cellulose-based material.
  • the synergistic increase in SCT Index is observed at a dry relative humidity.
  • the synergistic increase in SCT Index is observed at a high relative humidity. The synergistic increase in SCT Index for the cellulose-based materials of the present disclosure is demonstrated in the subsequent examples and was unexpected.
  • the cellulose-based material has a basis weight and a
  • Concora value Means of evaluating flat crush of a cellulose-based material via Concora are well known in the art.
  • the Concora value is greater than a comparative Concora value for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the dry strength chemistry preparation and the wet strength chemistry preparation.
  • the greater Concora value is observed at a dry relative humidity.
  • the greater Concora value is observed at a high relative humidity.
  • the Concora value is greater than a comparative Concora value for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the dry strength chemistry preparation.
  • the greater Concora value is observed at a dry relative humidity. In an embodiment, the greater Concora value is observed at a high relative humidity.
  • the Concora value is greater than a comparative Concora value for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the wet strength chemistry preparation.
  • the greater Concora value is observed at a dry relative humidity. In an embodiment, the greater Concora value is observed at a high relative humidity.
  • the dry strength chemistry preparation and the wet strength chemistry preparation provide a synergistic increase in Concora value for the cellulose-based material in comparison to the comparative cellulose-based material.
  • the synergistic increase in Concora value is observed at a dry relative humidity.
  • the synergistic increase in Concora value is observed at a high relative humidity. The synergistic increase in Concora value for the cellulose-based materials of the present disclosure is demonstrated in the subsequent examples and was unexpected.
  • a container comprising a cellulose-based material.
  • the container comprises cellulosic fibers, wherein the cellulosic fibers are treated with i) a dry strength chemistry preparation and ii) a wet strength chemistry preparation.
  • the cellulose-based material is a paper-based material.
  • the cellulose-based material is paper.
  • the cellulose-based material is a paper board.
  • the cellulose-based material is a medium.
  • a “medium” is well known in the art as an inner layer of a containerboard.
  • a medium may be fluted and/or sinusoidal in shape.
  • the cellulose-based material is a liner.
  • a “liner” is well known in the art as an outer layer of a containerboard.
  • the cellulose-based material is a containerboard.
  • the cellulose-based material is recyclable.
  • cellulose-based materials are known in the art to be certified for recycling.
  • FBA Fibre Box Association
  • the container is corrugated cardboard.
  • the cellulosic fibers comprise virgin fibers. In an aspect, the cellulosic fibers comprise recycled fibers. In an aspect, the cellulosic fibers comprise a combination of virgin fibers and recycled fibers. In an aspect, the cellulosic fibers are capable of being recycled. In an aspect, the container is capable of being recycled.
  • the combination of virgin fibers and recycled fibers may fall within one of several different ranges.
  • the combination may be one of the following ranges (in which the total percentage is 100%): about 1% to about 99% virgin fibers and about 1% to about 99% recycled fibers, about 5% to about 95% virgin fibers and about 5% to about 95% recycled fibers, about 10% to about 90% virgin fibers and about 10% to about 90% recycled fibers, about 15% to about 85% virgin fibers and about 15% to about 85% recycled fibers, about 20% to about 80% virgin fibers and about 20% to about 80% recycled fibers, about 25% to about 75% virgin fibers and about 25% to about 75% recycled fibers, about 30% to about 70% virgin fibers and about 30% to about 70% recycled fibers, about 35% to about 65% virgin fibers and about 35% to about 65% recycled fibers, about 40% to about 60% virgin fibers and about 40% to about 60% recycled fibers, about 45% to about 55% virgin fibers and about 45% to about 55% recycled fibers, about 48% to about 52% virgin fiber
  • the dry strength chemistry preparation comprises an aldehyde functionalized polymer.
  • the dry strength chemistry preparation comprises glyoxalated polyacrylamide (GPAM).
  • GPAM can be supplied, for example, as Solenis Hercobond Plus 555 (aka BASF Luredur Plus 555), as Solenis Hercobond Plus HC (aka BASF Luredur Plus HC), or as other GPAM formulations known in the art.
  • the GPAM is applied to the cellulosic fibers between 1-16 dry lbs/ton. In an embodiment, the GPAM is applied to the cellulosic fibers between 2-8 dry lbs/ton. In an embodiment, the GPAM is applied to the cellulosic fibers at 2 dry lbs/ton. In an embodiment, the GPAM is applied to the cellulosic fibers at 4 dry lbs/ton. In an embodiment, the GPAM is applied to the cellulosic fibers at 6 dry lbs/ton. In an embodiment, the GPAM is applied to the cellulosic fibers at 8 dry lbs/ton.
  • the wet strength chemistry preparation comprises a polyamide resin.
  • the polyamide resin is a polyamidoamine epihalohydrin resin.
  • the polyamide resin is selected from the group consisting of EPI-Poly amide resin, Polyamide- Epichlorohydrin resin (PAE), and Epichlorohydrin polyamide resin.
  • the polyamide resin is Polyamide-Epichlorohydrin resin (PAE).
  • the wet strength chemistry preparation can be supplied, for example, as Kymene 1500LV, as Nalco 63642, or as other wet strength chemistry formulations known in the art.
  • the polyamide resin is applied to the cellulosic fibers between 1-
  • the polyamide resin is applied to the cellulosic fibers between 2- 16 dry lbs/ton. In an aspect, the polyamide resin is applied to the cellulosic fibers between 2- 8 dry lbs/ton. In an aspect, the polyamide resin is applied to the cellulosic fibers at 2 dry lbs/ton. In an aspect, the polyamide resin is applied to the cellulosic fibers at 4 dry lbs/ton. In an aspect, the polyamide resin is applied to the cellulosic fibers at 6 dry lbs/ton. In an aspect, the polyamide resin is applied to the cellulosic fibers at 8 dry lbs/ton.
  • the cellulosic fibers are treated with a sizing agent.
  • the sizing agent is an internal sizing agent.
  • the sizing agent is a surface sizing agent.
  • the sizing agent is alkenyl succinic anhydride (ASA).
  • the sizing agent is rosin.
  • the sizing agent is alkyl ketene dimer (AKD).
  • the cellulosic fibers are treated with the dry strength chemistry preparation and the wet strength chemistry preparation at the same time.
  • the cellulosic fibers are treated with the dry strength chemistry preparation and the wet strength chemistry preparation sequentially, in either order.
  • the cellulosic fibers are treated with the dry strength chemistry preparation and the wet strength chemistry preparation separately.
  • the dry strength chemistry preparation and the wet strength chemistry preparation are combined prior to treating the cellulosic fibers.
  • the cellulosic fibers are treated with an enzymatic preparation.
  • the enzymatic preparation comprises a polypeptide having amylase activity.
  • the cellulosic fibers are not treated with an enzymatic preparation.
  • the cellulosic fibers are treated with an anionic surface preparation.
  • the anionic surface preparation is an anionic polyacrylamide.
  • the anionic surface preparation is a copolymer of acrylamide and unsaturated carboxylic acid monomers, being (meth)acrylic acid, maleic acid, crotonic acid, itaconic acid, or any combination thereof.
  • the cellulosic fibers are not treated with an anionic surface preparation.
  • the cellulose-based materials of the present disclosure may be determined to have certain properties.
  • the cellulose-based material has a basis weight.
  • a basis weight is generally understood in the paper making arts to represent the mass per unit of area of the cellulose-based materials.
  • the cellulose-based materials of the present disclosure can be contrasted to comparative cellulose-based materials having a similar basis weight in which the comparative cellulose-based materials lack the wet strength chemistry preparation, lack the dry strength chemistry preparation, or lack both the wet strength chemistry preparation and the dry strength chemistry preparation.
  • the cellulose-based material has a basis weight and a short- span compression strength (SCT).
  • SCT short- span compression strength
  • Means of evaluating compression strength of a cellulose- based material via SCT are well known in the art.
  • the SCT is greater than a comparative SCT for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the dry strength chemistry preparation and the wet strength chemistry preparation.
  • the greater SCT is observed at a dry relative humidity.
  • the greater SCT is observed at a high relative humidity.
  • a “high relative humidity” can refer to a relative humidity of 50% or greater, a relative humidity of 55% or greater, a relative humidity of 60% or greater, a relative humidity of 65% or greater, a relative humidity of 70% or greater, a relative humidity of 75% or greater, a relative humidity of 80% or greater, a relative humidity of 85% or greater, a relative humidity of 90% or greater, or a relative humidity of 95% or greater.
  • the SCT is greater than a comparative SCT for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the dry strength chemistry preparation.
  • the greater SCT is observed at a dry relative humidity. In an embodiment, the greater SCT is observed at a high relative humidity.
  • the SCT is greater than a comparative SCT for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the wet strength chemistry preparation.
  • the greater SCT is observed at a dry relative humidity. In an embodiment, the greater SCT is observed at a high relative humidity.
  • the dry strength chemistry preparation and the wet strength chemistry preparation provide a synergistic increase in SCT for the cellulose-based material in comparison to the comparative cellulose-based material.
  • the synergistic increase in SCT is observed at a dry relative humidity.
  • the synergistic increase in SCT is observed at a high relative humidity. The synergistic increase in SCT for the cellulose-based materials of the present disclosure is demonstrated in the subsequent examples and was unexpected.
  • the cellulose-based material has a basis weight and short- span compression strength index (SCT Index).
  • SCT Index short- span compression strength index
  • determining the SCT Index of a cellulose-based material is well known in the art by dividing the average SCT value of the cellulose-based material by the average basis weight of the cellulose-based material.
  • the SCT Index is greater than a comparative SCT Index for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the dry strength chemistry preparation and the wet strength chemistry preparation.
  • the greater SCT Index is observed at a dry relative humidity.
  • the greater SCT Index is observed at a high relative humidity.
  • the SCT Index is greater than a comparative SCT Index for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the dry strength chemistry preparation. In an embodiment, the greater SCT Index is observed at a dry relative humidity. In an embodiment, the greater SCT Index is observed at a high relative humidity. [0060] In an embodiment, the SCT Index is greater than a comparative SCT Index for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the wet strength chemistry preparation. In an embodiment, the greater SCT Index is observed at a dry relative humidity.
  • the greater SCT Index is observed at a high relative humidity.
  • the dry strength chemistry preparation and the wet strength chemistry preparation provide a synergistic increase in SCT Index for the cellulose-based material in comparison to the comparative cellulose-based material.
  • the synergistic increase in SCT Index is observed at a dry relative humidity.
  • the synergistic increase in SCT Index is observed at a high relative humidity. The synergistic increase in SCT Index for the cellulose-based materials of the present disclosure is demonstrated in the subsequent examples and was unexpected.
  • the cellulose-based material has a basis weight and a
  • Concora value Means of evaluating flat crush of a cellulose-based material via Concora are well known in the art.
  • the Concora value is greater than a comparative Concora value for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the dry strength chemistry preparation and the wet strength chemistry preparation.
  • the greater Concora value is observed at a dry relative humidity.
  • the greater Concora value is observed at a high relative humidity.
  • the Concora value is greater than a comparative Concora value for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the dry strength chemistry preparation.
  • the greater Concora value is observed at a dry relative humidity. In an embodiment, the greater Concora value is observed at a high relative humidity.
  • the Concora value is greater than a comparative Concora value for a comparative cellulose-based material made on the paper-making machine, wherein the comparative cellulose-based material having the basis weight and lacking the wet strength chemistry preparation.
  • the greater Concora value is observed at a dry relative humidity. In an embodiment, the greater Concora value is observed at a high relative humidity.
  • the dry strength chemistry preparation and the wet strength chemistry preparation provide a synergistic increase in Concora value for the cellulose-based material in comparison to the comparative cellulose-based material.
  • the synergistic increase in Concora value is observed at a dry relative humidity.
  • the synergistic increase in Concora value is observed at a high relative humidity. The synergistic increase in Concora value for the cellulose-based materials of the present disclosure is demonstrated in the subsequent examples and was unexpected.
  • the containers of the present disclosure may be determined to have certain properties.
  • the containers can comprise a cellulose-based material having a basis weight.
  • a basis weight is generally understood in the paper making arts to represent the mass per unit of area of the cellulose-based materials.
  • the containers of the present disclosure can be contrasted to comparative containers comprising cellulose-based materials having a similar basis weight in which the comparative cellulose-based materials lack the wet strength chemistry preparation, lack the dry strength chemistry preparation, or lack both the wet strength chemistry preparation and the dry strength chemistry preparation.
  • the container has a box compression strength (BCT50) measured at 50% relative humidity.
  • BCT50 is greater than a comparative box compression strength (CBCT50) measured at 50% relative humidity of a comparative container comprising comparative cellulose-based material made on the paper machine at the basis weight and lacking the dry strength chemistry preparation and the wet strength chemistry preparation.
  • CBCT50 comparative box compression strength
  • the BCT50 is greater than a CBCT50 measured at 50% relative humidity of a comparative container comprising comparative cellulose-based material made on the paper machine at the basis weight and lacking the dry strength chemistry preparation.
  • the BCT50 is greater than a comparative box compression strength CBCT50 measured at 50% relative humidity of a comparative container comprising comparative cellulose-based material made on the paper machine at the basis weight and lacking the wet strength chemistry preparation.
  • the dry strength chemistry preparation and the wet strength chemistry preparation provide a synergistic increase in BCT50 for the container in comparison to the comparative container. The synergistic increase in BCT50 for the containers of the present disclosure is demonstrated in the subsequent examples and was unexpected.
  • the container has a box compression strength (BCT85) measured at 85% relative humidity.
  • BCT85 is greater than a comparative box compression strength (CBCT85) measured at 85% relative humidity of a comparative container comprising comparative cellulose-based material made on the paper machine at the basis weight and lacking the dry strength chemistry preparation and the wet strength chemistry preparation.
  • CBCT85 comparative box compression strength
  • the BCT85 is greater than a CBCT85 measured at 85% relative humidity of a comparative container comprising comparative cellulose-based material made on the paper machine at the basis weight and lacking the dry strength chemistry preparation.
  • the BCT85 is greater than a comparative box compression strength CBCT85 measured at 85% relative humidity of a comparative container comprising comparative cellulose-based material made on the paper machine at the basis weight and lacking the wet strength chemistry preparation.
  • the dry strength chemistry preparation and the wet strength chemistry preparation provide a synergistic increase in BCT85 for the container in comparison to the comparative container. The synergistic increase in BCT85 for the containers of the present disclosure is demonstrated in the subsequent examples and was unexpected.
  • a cellulose-based material comprising cellulosic fibers, wherein the cellulosic fibers are treated with i) a dry strength chemistry preparation and ii) a wet strength chemistry preparation.
  • a container comprising a cellulose-based material comprising cellulosic fibers, wherein the cellulosic fibers are treated with i) a dry strength chemistry preparation and ii) a wet strength chemistry preparation.
  • cellulose-based materials with a basis weight of 36 were prepared and compared. Preparation of the different cellulose-based materials included varying the basis weight of the material, the presence of a wet strength chemistry preparation, and the presence and amount of a dry strength chemistry preparation. [0072] The various cellulose-based materials with a basis weight of 36 were compared to other cellulose-based materials with a basis weight of 40 or a basis weight of 45. The evaluations of the other cellulose-based materials (i.e., with a basis weight of 40 or a basis weight of 45) are based on average production runs at the mill for Paper Trial #1.
  • cellulose-based material can be produced using an aqueous slurry comprising cellulosic fibers.
  • the general process for making cellulose-based material is well known in the art and can utilize starting materials such as trees, logs, and/or chips to provide the cellulosic fibers. Such starting materials are heated in a “defibering” method and the resultant cellulosic fibers are then further processed with water to form the aqueous slurry.
  • the general process for making cellulose-based materials is described, for instance, in U.S. Patent No. 7,648,772 and U.S. Patent No. 7,682,486, bothherein incorporated by reference in their entireties.
  • virgin fibers, recycled fibers (e.g., old corrugated containers, other recycled paper products, and the like), or combinations thereof can be used in the aqueous slurry.
  • the aqueous slurry can also comprise, for example, water, mechanical fibers (e.g., NSSC), ash content, and other materials known in the art.
  • the wet strength chemistry preparation and the dry strength chemistry preparation are then added to the aqueous slurry.
  • the wet strength chemistry preparation and the dry strength chemistry preparation can be added to the aqueous slurry separately or together and can also be added to the aqueous slurry in any order.
  • the aqueous slurry is formed into a web and then dried to produce the cellulose-based material.
  • the cellulose-based materials were evaluated for SCT values according to the procedures of TAPPI 826, entitled “Short span compression strength of containerboard.”
  • the SCT evaluation can determine the edgewise compressive strength of cellulose-based materials such as paperboard with a span-to-thickness ratio of 5 or less (basis wt. 20#/msf or greater.)
  • a L&W 152 STFI Tester can be utilized as equipment for the SCT evaluation.
  • the cellulose-based materials were evaluated for SCT Index by calculating the average SCT value divided by the average weight of the sample (i.e., basis weight). For basis weight determinations, the procedures of TAPPI T 410, entitled “Grammage of paper and paperboard (weight per unit area),” were utilized. For instance, a Toledo Basis Weight Scale or Mettler analytical balance can be utilized as equipment for the basis weight evaluation. [0080] The cellulose-based materials were evaluated for Concora values according to the procedures of TAPPI 809, entitled “Flat crush of corrugating medium (CMT Test).” Testing of flat crush resistance is necessary to prevent crushing the structure on the corrugator or finishing equipment, and Concora evaluation allows for testing prior to fabrication of board or containers from the cellulose-based materials. Concora evaluation is also utilized for determining fabrication efficiency.
  • a L&W SE 108 Sample Die Cutter, a fluter, and a L&W Crust Tester code 248 can be utilized as equipment for the Concora evaluation.
  • the cellulose-based material in accordance with the present disclosure even when prepared using a lower basis weight, demonstrated superior or similar SCT, SCT Index, and Concora values compared to other cellulose-based materials prepared with a higher basis weight.
  • cellulose-based material with a lower basis weight when prepared in accordance with the present disclosure, performs better than comparative cellulose-based material with a higher basis weight.
  • This improved performance provides an advantage in that cellulose-based material prepared in accordance with the present disclosure uses at least 10% less material to generate a product with desirable characteristics compared to traditional paper making procedures.
  • SCT short-span compression strength
  • SCT Index SCT Index
  • Concora Concora
  • the cellulose-based material in accordance with the present disclosure was superior than the comparison cellulose-based materials.
  • inclusion of a dry strength chemistry preparation demonstrated an increase in SCT, SCT Index, and Concora values compared to other cellulose-based materials that did not include a dry strength chemistry preparation.
  • the cellulose-based material in accordance with the present disclosure even when prepared using a lower basis weight, demonstrated superior or similar SCT, SCT Index, and Concora values compared to other cellulose-based materials prepared with a higher basis weight.
  • cellulose-based material with a lower basis weight when prepared in accordance with the present disclosure, performs better than comparative cellulose-based material with a higher basis weight.
  • This improved performance provides an advantage in that cellulose-based material prepared in accordance with the present disclosure uses at least 10% less material to generate a product with desirable characteristics compared to traditional paper-making procedures.
  • SCT short-span compression strength
  • SCT Index SCT Index
  • Concora Concora
  • cellulose-based materials with a basis weight of 36 were prepared and compared. Preparation of the different cellulose-based materials included varying the basis weight of the material, the presence of a wet strength chemistry preparation, and the presence and amount of a dry strength chemistry preparation. [0094] The various cellulose-based materials with a basis weight of 36 were compared to other cellulose-based materials with a basis weight of 40 or a basis weight of 45. The evaluations of the other cellulose-based materials (i.e., with a basis weight of 40 or a basis weight of 45) are based on average production runs at the mill for Paper Trial #3.
  • the cellulose-based material in accordance with the present disclosure was superior than the comparison cellulose-based materials.
  • inclusion of a dry strength chemistry preparation demonstrated an increase in SCT, SCT Index, and Concora values compared to other cellulose-based materials that did not include a dry strength chemistry preparation.
  • the cellulose-based material in accordance with the present disclosure even when prepared using a lower basis weight, demonstrated superior or similar SCT, SCT Index, and Concora values compared to other cellulose-based materials prepared with a higher basis weight.
  • cellulose-based material with a lower basis weight when prepared in accordance with the present disclosure, performs better than comparative cellulose-based material with a higher basis weight.
  • This improved performance provides an advantage in that cellulose-based material prepared in accordance with the present disclosure uses at least 10% less material to generate a product with desirable characteristics compared to traditional paper-making procedures.
  • SCT short-span compression strength
  • SCT Index SCT Index
  • Concora Concora
  • cellulose-based materials with a basis weight of 23 were prepared and compared. Preparation of the different cellulose-based materials included varying the basis weight of the material, the presence of a wet strength chemistry preparation, and the presence and amount of a dry strength chemistry preparation. [00102] The various cellulose-based materials with a basis weight of 23 were compared to other cellulose-based materials with a basis weight of 26 or a basis weight of 30. The evaluations of the other cellulose-based materials (i.e., with a basis weight of 26 or a basis weight of 30) are based on average production runs at the mill for Paper Trial #4.
  • the cellulose-based material in accordance with the present disclosure was superior than the comparison cellulose-based materials.
  • inclusion of a dry strength chemistry preparation demonstrated an increase in SCT, SCT Index, and Concora values compared to other cellulose-based materials that did not include a dry strength chemistry preparation.
  • the cellulose-based material in accordance with the present disclosure even when prepared using a lower basis weight, demonstrated superior or similar SCT, SCT Index, and Concora values compared to other cellulose-based materials prepared with a higher basis weight.
  • cellulose-based material with a lower basis weight when prepared in accordance with the present disclosure, performs better than comparative cellulose-based material with a higher basis weight.
  • This improved performance provides an advantage in that cellulose-based material prepared in accordance with the present disclosure uses at least 10% less material to generate a product with desirable characteristics compared to traditional paper-making procedures.
  • An exemplary container in accordance with certain aspects of the present disclosure is provided in the instant example. Evaluations in the instant example include box compression strength measured at 50% relative humidity (BCT50) and box compression strength measured at 85% relative humidity (BCT85).
  • a Corrugator can be used to produce corrugated sheets.
  • a Corrugator can range from about 250 to about 400 feet long with a width range from about 67 inches to about 132 inches.
  • Typical Corrugators can include a Single Facer section wherein the top liner can be adjoined with starch to a medium that has been corrugated via corrugating rolls.
  • Corrugators are known to the skilled artisan and can include, for example, those manufactured by United, BHS, MHI, Fosber, and the like.
  • the second side liner can then be adhered using starch to the single face sheet in a “Doublefacer” or “Doublebacker” apparatus.
  • the resultant combined board sheet can then be cut into specified widths and can be scored for folding in the container-making process.
  • a cutoff knife can be used to cut the container to the desired length.
  • a Corrugator can operate at a speed from about 600 to about 1200 feet per minute (fpm) and can be varied according to the general knowledge in the art.
  • a Flexo Folder Gluer can include a feed section, print section, slotter-scorer, and a folder gluer section.
  • a die cutter can be, for example, rotary or platen (flatbed) and produces slotted carton containers that are typically not glued.
  • the cellulose-based materials can be evaluated for BCT50 values according to the procedures of TAPPI T-804 om-06, entitled “Compression Test of Fiberboard Shipping Containers.”
  • the containers can be conditioned at a temperature of 73°F and 50% relative humidity for the BCT50 evaluation, as it is important to provide uniform moisture content for the testing (see T402, entitled “Standard conditioning and testing atmospheres for paper, board, pulp hand sheets, and related products”).
  • the containers can be subjected to preconditioning in a preconditioning chamber. Temperature and humidity preconditioning can be performed overnight or for at least 2 hours (e.g., liner, medium, bag, or other cellulose-based materials), at least 7 hours (e.g., corrugated board, solid fiber, or open containers), at least 14 hours (e.g., sealed containers), or 72 hours (e.g., vapor resistant (waxed) board and containers).
  • a preconditioning chamber e.g., liner, medium, bag, or other cellulose-based materials
  • at least 7 hours e.g., corrugated board, solid fiber, or open containers
  • at least 14 hours e.g., sealed containers
  • 72 hours e.g., vapor resistant (waxed) board and containers.
  • Temperature and humidity conditioning can be performed overnight or for at least 4 hours (e.g., liner, medium, bag, or other cellulose-based materials), at least 8 hours (e.g., corrugated board, solid fiber, or open containers), at least 16 hours (e.g., sealed containers), or 72 hours (e.g., vapor resistant (waxed) board and containers).
  • 4 hours e.g., liner, medium, bag, or other cellulose-based materials
  • at least 8 hours e.g., corrugated board, solid fiber, or open containers
  • at least 16 hours e.g., sealed containers
  • 72 hours e.g., vapor resistant (waxed) board and containers.
  • the BCT50 evaluation can measure the ability of containers, such as corrugated or solid fiber shipping containers, to resist external compressive forces. A higher BCT50 value is desirable because external compressive forces may be encountered in stacking the containers or in transporting the containers.
  • An Emerson Tester Model 6210 and/or an Emerson Model 8510 can be utilized as compression tester equipment for the BCT50 evaluation.
  • the container can be placed at the center of the bottom platen of the compression tester. Then, a preload can be applied to the container, for instance 50 pounds on a singlewall container, 100 pounds on a doublewall container, or 500 pounds on bulk bins.
  • the load can continue to be applied to the container at the rate of 0.5 inches (13 +/- 2.5 mm) until failure occurs, as evidenced by one or both of i) falling back from maximum load of 25% or ii) deflection exceeding 0.75 inches or greater. Thereafter, the maximum compression and deflection or the compression at the specified deflection can be recorded for the evaluated container.
  • BCT85 evaluations are conducted in a similar manner as the BCT50 evaluations, except that the containers can be conditioned at a temperature of 40°F and 85% relative humidity prior to compression testing.
  • SCT short- span compression strength
  • BCT50 box compression strength measured at 50% relative humidity
  • BCT85 box compression strength measured at 85% relative humidity
  • the containers in accordance with the present disclosure were superior than the comparison containers.
  • Inclusion of a dry strength chemistry preparation in the cellulose-based materials that prepared the containers demonstrated an increase in SCT and SCT Index values compared to the comparison containers made with cellulose-based materials that did not include a dry strength chemistry preparation.
  • inclusion of a dry strength chemistry preparation in the cellulose-based materials that prepared the containers demonstrated an increase in BCT50 and BCT85 values compared to the comparison containers made with cellulose-based materials that did not include a dry strength chemistry preparation.
  • Container Trial #3 IPlant Cl [00128] An exemplary container in accordance with certain aspects of the present disclosure is provided in the instant example. Evaluations in the instant example include short- span compression strength (SCT), SCT Index, box compression strength measured at 50% relative humidity (BCT50), and box compression strength measured at 85% relative humidity (BCT85).
  • SCT short- span compression strength
  • BCT50 box compression strength measured at 50% relative humidity
  • BCT85 box compression strength measured at 85% relative humidity
  • the containers in accordance with the present disclosure were superior than the comparison containers.
  • Inclusion of a dry strength chemistry preparation in the cellulose-based materials that prepared the containers demonstrated an increase in SCT and SCT Index values compared to the comparison containers made with cellulose-based materials that did not include a dry strength chemistry preparation.
  • inclusion of a dry strength chemistry preparation in the cellulose-based materials that prepared the containers demonstrated an increase in BCT50 and BCT85 values compared to the comparison containers made with cellulose-based materials that did not include a dry strength chemistry preparation.
  • SCT short- span compression strength
  • BCT50 box compression strength measured at 50% relative humidity
  • BCT85 box compression strength measured at 85% relative humidity
  • SCT short-span compression strength
  • SCT Index SCT Index
  • Concora Concora
  • the cellulose-based material in accordance with the present disclosure was superior than the comparison cellulose-based materials.
  • inclusion of a dry strength chemistry preparation plus a wet strength chemistry preparation demonstrated an increase in SCT and SCT Index compared to other cellulose-based materials that did not include a dry strength chemistry preparation.

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  • Laminated Bodies (AREA)
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Citations (4)

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WO1998036127A1 (en) * 1997-02-14 1998-08-20 Cytec Technology Corp. Papermaking methods and compositions
US7648772B2 (en) 2005-06-28 2010-01-19 International Paper Co. Moisture resistant container
US7682486B2 (en) 2000-01-26 2010-03-23 International Paper Company Low density paperboard articles
WO2015108751A1 (en) * 2014-01-16 2015-07-23 Ecolab Usa Inc. Wet end chemicals for dry end strength in paper

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US4096305A (en) * 1972-08-03 1978-06-20 Alton Box Board Company Rigid-when-wet paperboard containers and their manufacture
US20050133177A1 (en) * 2003-12-22 2005-06-23 Sca Hygiene Products Ab Method for adding chemicals to a nonwoven material
US9777434B2 (en) * 2011-12-22 2017-10-03 Kemira Dyj Compositions and methods of making paper products
US11015287B1 (en) * 2020-06-30 2021-05-25 International Paper Company Processes for making improved cellulose-based materials and containers

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Publication number Priority date Publication date Assignee Title
WO1998036127A1 (en) * 1997-02-14 1998-08-20 Cytec Technology Corp. Papermaking methods and compositions
US7682486B2 (en) 2000-01-26 2010-03-23 International Paper Company Low density paperboard articles
US7648772B2 (en) 2005-06-28 2010-01-19 International Paper Co. Moisture resistant container
WO2015108751A1 (en) * 2014-01-16 2015-07-23 Ecolab Usa Inc. Wet end chemicals for dry end strength in paper

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