EP4229237A1 - A method for preparing modified pulp - Google Patents
A method for preparing modified pulpInfo
- Publication number
- EP4229237A1 EP4229237A1 EP21806299.0A EP21806299A EP4229237A1 EP 4229237 A1 EP4229237 A1 EP 4229237A1 EP 21806299 A EP21806299 A EP 21806299A EP 4229237 A1 EP4229237 A1 EP 4229237A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulp
- modified
- article
- def
- dried
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 64
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- 230000001862 defibrillatory effect Effects 0.000 claims abstract description 26
- 239000000835 fiber Substances 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 8
- 229920005989 resin Polymers 0.000 claims description 20
- 239000011347 resin Substances 0.000 claims description 20
- 238000010521 absorption reaction Methods 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 239000012212 insulator Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 238000005259 measurement Methods 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 5
- 239000011122 softwood Substances 0.000 description 5
- 229920005992 thermoplastic resin Polymers 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004519 grease Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 239000001993 wax Substances 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- -1 alkenyl succinic anhydride Chemical compound 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 239000002537 cosmetic Substances 0.000 description 2
- 239000011121 hardwood Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 244000283070 Abies balsamea Species 0.000 description 1
- 235000007173 Abies balsamea Nutrition 0.000 description 1
- 235000018185 Betula X alpestris Nutrition 0.000 description 1
- 235000018212 Betula X uliginosa Nutrition 0.000 description 1
- 241000219495 Betulaceae Species 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 235000014466 Douglas bleu Nutrition 0.000 description 1
- 244000166124 Eucalyptus globulus Species 0.000 description 1
- 240000000731 Fagus sylvatica Species 0.000 description 1
- 235000010099 Fagus sylvatica Nutrition 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 241000218652 Larix Species 0.000 description 1
- 235000005590 Larix decidua Nutrition 0.000 description 1
- 240000007472 Leucaena leucocephala Species 0.000 description 1
- 235000010643 Leucaena leucocephala Nutrition 0.000 description 1
- 229920000426 Microplastic Polymers 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000219000 Populus Species 0.000 description 1
- 241000183024 Populus tremula Species 0.000 description 1
- 240000001416 Pseudotsuga menziesii Species 0.000 description 1
- 235000005386 Pseudotsuga menziesii var menziesii Nutrition 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 241000219492 Quercus Species 0.000 description 1
- 235000016976 Quercus macrolepis Nutrition 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 206010061592 cardiac fibrillation Diseases 0.000 description 1
- 239000013068 control sample Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002600 fibrillogenic effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 108700005457 microfibrillar Proteins 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229940014800 succinic anhydride Drugs 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000003784 tall oil Substances 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special 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
- 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
- D21H11/20—Chemically or biochemically modified 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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/18—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising waxes
-
- 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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
- D21H23/06—Controlling the addition
- D21H23/14—Controlling the addition by selecting point of addition or time of contact between components
- D21H23/16—Addition before or during pulp beating or refining
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
-
- 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 a method for preparing modified pulp, to modified pulp, and to articles prepared therefrom.
- Plastics are not biodegradable or are biodegraded only very slowly, producing microplastics.
- Single use items are often used e.g. in packaging, consumer products, cosmetics and healthcare. Therefore, there is a need to provide single use items that are produced from materials other than plastic and that may be biodegradable.
- Natural fibers such as wood fibers, are renewable raw materials well suited for producing single use items.
- single use items may require a level of barrier properties against e.g. water and/or grease.
- a plastic film may be added to such items, but then such an item is no longer plastic-free.
- a biodegradable barrier layer may be sprayed on such items, but this may increase costs and complicate the process of producing such items.
- a method for preparing modified pulp may comprise adding a hydrophobization agent to wet pulp; and drying the wet pulp, thereby obtaining dried pulp.
- the dried pulp may be intended for def ibrillating into fibers, thereby obtaining the modified pulp; or the method may further comprise def ibrillating the dried pulp into fibers , thereby obtaining the modified pulp .
- a method for preparing modified pulp is also disclosed, wherein the method may comprise def ibrillating dried pulp, thereby obtaining the modified pulp .
- the dried pulp may be obtainable by adding a hydrophobi zation agent to wet pulp and by drying the wet pulp .
- Fig . 1 is a flow chart illustration of an embodiment of the method.
- Fig . 2 illustrates the absorption time measurements of modified ( left ) and unmodified fluff pulp ( right ) .
- a method for preparing modified pulp may comprise adding a hydrophobi zation agent to wet pulp ; and drying the wet pulp, thereby obtaining dried pulp ; wherein the dried pulp is intended for def ibrillating into fibers , thereby obtaining the modified pulp ; or the method further comprises def ibrillating the dried pulp into fibers , thereby obtaining the modified pulp .
- a method for preparing modified pulp may comprise def ibrillating dried pulp, thereby obtaining the modified pulp ; wherein the dried pulp is obtainable by adding a hydrophobi zation agent to wet pulp and by drying the wet pulp .
- the method may be a method for reducing the absorption time of the modified pulp .
- modified pulp may be considered water- repel lant , at least compared to a comparable pulp that has not been treated with a hydrophobi zation agent ; water penetration to the pulp network may be dramatically reduced .
- modified pulp may be used for purposes in which the natural absorption properties of the pulp fibers are not desirable , for example in the preparation of single use items and articles used e . g . in packaging, consumer products , cosmetics and/or healthcare . Examples of such items and articles are described below .
- such single use items and articles may have barrier properties against water and/or grease due to the absorption properties of the modified pulp . This may reduce or even obviate the need to add a plastic fi lm or other barrier layer to the item or article . Further, even if the modified pulp may still absorb water to an extent , it may not necessari ly condense but may still maintain its bulk . The single use items or articles may thus have improved durability, in particular when a plastic film or other barrier layer is not added thereto .
- fibers of the pulp may be impregnated with the hydrophobi zation agent efficiently, such that the modified absorbency properties are still present ( at least to a significant extent ) even after the def ibrillating of the dried pulp into fibers , which process may typically destroy any modifications done to fibers prior to the def ibrillating .
- the method may be relatively efficient and does not require a complicated or energy consuming process .
- the modification by the hydrophobi zation agent may also assist in the def ibrillating .
- the modified pulp may be modified def ibrillated pulp .
- the modified pulp may, in some embodiments , be modified fluff pulp .
- def ibrillated pulp may be understood as referring to pulp obtainable by def ibrillating dried ( i . e . dry) pulp .
- the def ibrillated pulp may be obtainable by def ibrillating according to one or more embodiments described below .
- fluff pulp may be understood as it is commonly understood in the field . Fluf f pulp is often made from long fibre softwoods . It is typically intended for applications that require high absorbency, such as a raw material in the absorbent core of personal care products such as diapers , feminine hygiene products , air-laid absorbent towelling, as such, or with superabsorbents and/or synthetic fibres .
- the pulp may otherwise have properties similar to regular fluff pulp ( to which no hydrophozation agent has not been added) , but it may have different absorption properties (due to the effect of the hydrophobi zation agent ) , as set out in thi s specification .
- the method for preparing the modified pulp may be similar to methods for preparing fluff pulp, and so the modified pulp may have many properties otherwise similar to fluff pulp.
- the pulp in the wet pulp may comprise or be pulp obtainable from softwood, such as spruce, pine, fir, larch, Douglas fir or hemlock. Additionally or alternatively, it may comprise or be pulp obtainable from hardwood, such as birch, aspen, poplar, alder, eucalyptus, oak, beech or acacia, or from a mixture of a softwood and a hardwood.
- the pulp may be e.g. Scandinavian pulp.
- the pulp may comprise or be pulp obtainable from long fibre softwood (s) .
- the pulp may be chemical pulp.
- the pulp may contain, in addition to the cellulose fibers, e.g. hemicellulose and residual lignin, and optionally other components.
- the dried pulp may have a dry matter content of about 85 to 99 % (w/w) based on the total weight of the dried pulp, and/or the pulp may be dried so as to have a dry matter content of about 85 to 99 % (w/w) based on the total weight of the dried pulp.
- the dried pulp may be understood as referring to the pulp prior to the def ibrillating .
- the dried pulp may be e.g. in the form of bales or rolls prior to the def ibrillating .
- the dried pulp may be obtainable in such a form, and it may subsequently be def ibrillated e.g. in a converting line.
- the dried pulp may be dried fluff pulp or dried pulp intended or suitable for producing fluff pulp.
- the density of the dried pulp may be e.g. in the range of 0.4 - 0.7 cm 3 /g.
- the density of the dried pulp may be e.g. in the range of 0.45 - 0.65 cm 3 /g, or 0.5 - 0.6 cm 3 /g .
- the density may be determined e.g. according to the standard ISO 3034.
- the dried pulp may have a bursting strength according to the Mullen method, i.e. a Mullen value, in the range of 350 - 1500 kPa.
- the term "def ibrillating” may be understood as referring to mechanically def ibrillating the pulp .
- the def ibrillating may separate fibers in the pulp from each other .
- the pulp may thus be def ibrillated into single fibers , or at least partially into single f ibers . This process may also be referred to as defibri zing, defibration and/or defibrillation .
- the def ibrillating may be done on the dried pulp in dry form, i . e . the dried pulp may be dry ( in dry form) when def ibrillated .
- the defibrillation may be done such that the lengths of the fibers of the pulp are not essentially or significantly shortened by the defibrillation, i . e . the length of the fibers of the pulp is essentially the same before and after the defibrillation .
- the defibrillation may be done such that the fibers are not disintegrated into fibrils ( at least to a significant extent ) .
- the def ibrillating should therefore not be understood as referring to e . g . fibrillation that may result in nanof ibrillar cellulose .
- the modified cellulose may thus also be understood as not referring to or including nanof ibrillar and/or microfibrillar cellulose .
- the def ibrillated modified pulp may be used further, for example by forming articles thereof as described below or by forming other products thereof .
- the dried pulp may be def ibrillated by shredding .
- Any suitable shredding device may be used .
- the pulp may be def ibrillated by a hammer mill .
- Other shredding devices may be contemplated, for example shredding devices suitable for def ibrillating pulp into fluff pulp .
- the shredding device may be at least one of a hammer mill , a pin mill , a saw-toothblade , or a briseur .
- the hydrophobization agent may, in principle, be any agent capable of hydrophobizing the pulp.
- the hydrophobization agent may comprise or be a resin, wax, a wet glue resin, or any mixture or combination thereof.
- the resin may be e.g. a hydrophobization resin.
- An example of such a resin could be e.g. tall oil resin.
- the hydrophobization agent may be capable of binding to the pulp by forming hydrogen bonds with the pulp.
- it may be capable of binding to the pulp by forming hydrogen bonds only (as opposed e.g. to forming a covalent bond with the pulp) .
- hydrophobization agents capable of binding to the pulp by forming a covalent bond (or covalent bonds) with the pulp may also be contemplated.
- An example of such hydrophobization agent could be e.g. alkenyl succinic anhydride (ASA) or alkyl ketene dimer (AKD) .
- ASA alkenyl succinic anhydride
- ALD alkyl ketene dimer
- Such hydrophobization agents could form e.g. ester bonds with the hydroxyl groups of the cellulose of the pulp.
- the hydrophobization agent consists of a resin (such as a thermoplastic resin) , wax, a wet glue resin, and any mixture or combination thereof .
- the hydrophobization agent may comprise or be a thermoplastic resin.
- the hydrophobization agent consists of a thermoplastic resin .
- the resin such as a thermoplastic resin
- the hydrophobization agent may be e.g. a composition comprising one or more components, for example any suitable hydrophobization component described in this specification (such as a resin, wax, a wet glue resin, or any mixture or combination thereof) and optionally water and/or an aqueous solution. Alternatively or additionally, two or more hydrophobization agents or components may be added separately to the wet pulp.
- any suitable hydrophobization component described in this specification such as a resin, wax, a wet glue resin, or any mixture or combination thereof
- water and/or an aqueous solution optionally water and/or an aqueous solution.
- two or more hydrophobization agents or components may be added separately to the wet pulp.
- the hydrophobization agent may be a liquid or in the form of a liquid.
- the hydrophobization agent may be water-based.
- such components may be e . g . in the form of an emulsion in the hydrophobization agent or composition.
- the hydrophobization agent may, in some embodiments, be added to a wet pulp with a pH in the range of 2 - 6.
- the pH of the wet pulp may be in the range of 2 - 6 when the hydrophobization agent is added thereto.
- the pH may be in the range of 2.5 - 5; or of 2.5 - 5.5; or of 2.5 - 4.5.
- wet pulp may be understood as referring to pulp suspended in water and/or an aqueous solution.
- the wet pulp may be e.g. pulp slush.
- the wet pulp may be pulp at a wet end of a pulp production process (i.e. wet end pulp) .
- it may be pulp at a wet end of a fluff production process.
- the hydrophobization agent may be added to the pulp at a wet end.
- the hydrophobization agent may be added to the pulp suspended in water and/or an aqueous solution, such that the water and/or aqueous solution has a pH in the range of 2 - 6, or any other pH described in this specification.
- the pulp (wet or dried) may be obtainable by a treatment with a debonder, or it may be treated with a debonder.
- the debonder may render the pulp more easily def ibrillated .
- the debonder may be e.g. a surfactant capable of disrupting interfiber hydrogen bonds.
- the method may be a method for producing an article.
- the method may further comprise forming an article of the modified pulp.
- the article may be formed at least partially of the modified pulp; other components may be included, if desired and/or necessary.
- the article may be formed e.g. by form pressing or wet pressing. Heat, steam and/or underpressure may be applied to the article when form pressing.
- Other suitable methods for forming the article from the modified pulp may be contemplated.
- the modified pulp described in this specification may be well suited e.g. for form pressing, as the defibrillation allows for pressing and/or otherwise forming the modified pulp into various forms.
- a modified pulp obtainable by the method according to the first or second aspect, and according to one or more embodiments described in this specification, is also disclosed.
- a modified pulp is also disclosed.
- the modified pulp may be def ibrillated and exhibit an absorption time of at least 20 seconds. In some embodiments, the modified pulp may exhibit an absorption time of at least 50 seconds, or at least 100 seconds.
- the modified pulp may be obtainable by the method according to the first or second aspect, and according to one or more embodiments described in this specification .
- the absorption capacity of the modified pulp may be in the range of 7 - 12 g/g (i.e. 7 - 12 H2O g/g) .
- the modified pulp may have a bulk of 16 - 24 cm 3 /g. In certain embodiments, the modified pulp may have a bulk of 17 - 23 cm 3 /g, or 19 - 22 cm 3 /g.
- the modified pulp may be modified def ibrillated pulp and/or modified fluff pulp.
- the modified pulp may be dry modified pulp (as opposed to being e.g. in the form of a gel) .
- the dry modified pulp may have a moisture content of e.g. about 6 - 10 % (w/w) .
- the article may be formed at least partially of the modified pulp; other components may be included, if desired and/or necessary.
- the article may be formed e.g. by form pressing or wet pressing. Heat, steam and/or underpressure may be applied to the article when form pressing. However, other suitable methods for forming the article from the modified pulp may be contemplated .
- the article may be an article that is intended not to absorb water and/or grease, at least to a significant extent. Various articles and items may therefore be contemplated.
- the article may be a single use article or a single use item.
- articles may include e.g. a container (such as a food container) , a catering item, a casing, a tray, a cup, a utensil, cutlery (such as a fork, a knife, or a spoon) , a plate, or a packaging article.
- the article may be a filter or an insulator.
- the modified pulp and/or articles formed therefrom may, at least in some embodiments, be biodegradable .
- a method for producing an article comprising forming the article of the modified pulp according to one or more embodiments described in this specification.
- the article may be an article according to one or more embodiments described in this specification.
- Figure 1 describes an embodiment of a method for preparing modified pulp.
- Pulp in wet format i.e. wet pulp
- a hydrophobi zation agent 2 is added to the wet pulp, such that the hydrophobization agent binds to the fibers of the wet pulp at least partially.
- the wet pulp that has been treated with the hydrophobization agent is then dried at 3 to provide the pulp in a dry format, i.e. as dried pulp, at 4, for example as bales or rolls.
- the method may continue futher to a shredding process 5 e.g. at the same site or process.
- the pulp in dry format 4 may be e.g.
- the pulp in dry format is at least partially def ibrillated into single fibers, resulting in modified def ibrillated pulp 6.
- the shredding process may be performed mechanically e.g. using a suitable shredding device, such as a hammer mill or a pin mill.
- modified fluff pulps exhibited significant water repellency and modified absorption properties .
- the Klemm test was performed by cutting a 25 cm strip of each sheet and by measuring the length along which the strip absorbed water within 10 min . According to the Klemm test , the modified fluff pulps absorbed less water . Results of other absorption measurements are shown in Table 2 .
- Fig . 2 illustrates the absorption time measurements of modified ( left ) and unmodified fluff pulp ( right ) .
- Cylindrical test pieces of the fluff pulps having a mass of 3 g and a diameter of 50 mm, were prepared in a test piece former . Test pieces were placed in a vertical position and a load of 500 g was applied . The test pieces were placed on the surface of water in cups as shown in Fig . 2 so that they could absorb water from below . The test pieces of unmodif ied fluff pulp absorbed water within seconds and sank . The test pieces of modified fluff pulps however absorbed water very slowly .
- SEC shredding energy consumption, i . e . disintegration energy or defibration energy
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Biochemistry (AREA)
- Paper (AREA)
Abstract
A method is disclosed. The method may comprise adding a hydrophobization agent to wet pulp; drying the wet pulp, thereby obtaining dried pulp; wherein the dried pulp is intended for defibrillating into fibers, thereby obtaining the modified pulp; or the method further comprises defibrillating the dried pulp into fibers, thereby obtaining the modified pulp.
Description
A METHOD FOR PREPARING MODIFIED PULP
TECHNICAL FIELD
The present disclosure relates to a method for preparing modified pulp, to modified pulp, and to articles prepared therefrom.
BACKGROUND
A significant portion of plastic products end up in landfills and to the environment, such as in oceans and waterways. Plastics are not biodegradable or are biodegraded only very slowly, producing microplastics. Single use items are often used e.g. in packaging, consumer products, cosmetics and healthcare. Therefore, there is a need to provide single use items that are produced from materials other than plastic and that may be biodegradable.
Natural fibers, such as wood fibers, are renewable raw materials well suited for producing single use items. However, single use items may require a level of barrier properties against e.g. water and/or grease. A plastic film may be added to such items, but then such an item is no longer plastic-free. Alternatively, e.g. a biodegradable barrier layer may be sprayed on such items, but this may increase costs and complicate the process of producing such items.
SUMMARY
A method for preparing modified pulp is disclosed. The method may comprise adding a hydrophobization agent to wet pulp; and drying the wet pulp, thereby obtaining dried pulp. The dried pulp may be intended for def ibrillating into fibers, thereby obtaining the modified pulp; or the method may further
comprise def ibrillating the dried pulp into fibers , thereby obtaining the modified pulp .
A method for preparing modified pulp is also disclosed, wherein the method may comprise def ibrillating dried pulp, thereby obtaining the modified pulp . The dried pulp may be obtainable by adding a hydrophobi zation agent to wet pulp and by drying the wet pulp .
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings , which are included to provide a further understanding of the embodiments and constitute a part of this specification, illustrate various embodiments . In the drawings :
Fig . 1 is a flow chart illustration of an embodiment of the method; and
Fig . 2 illustrates the absorption time measurements of modified ( left ) and unmodified fluff pulp ( right ) .
DETAILED DESCRIPTION
In a first aspect , a method for preparing modified pulp is disclosed . The method may comprise adding a hydrophobi zation agent to wet pulp ; and drying the wet pulp, thereby obtaining dried pulp ; wherein the dried pulp is intended for def ibrillating into fibers , thereby obtaining the modified pulp ; or the method further comprises def ibrillating the dried pulp into fibers , thereby obtaining the modified pulp .
In a second aspect , a method for preparing modified pulp is disclosed . The method may comprise def ibrillating dried pulp, thereby obtaining the modified pulp ; wherein the dried pulp is obtainable by
adding a hydrophobi zation agent to wet pulp and by drying the wet pulp .
Any embodiments described below in this specification may be understood as relating to the first aspect and/or to the second aspect .
The method may be a method for reducing the absorption time of the modified pulp .
With the method, it may be pos sible to modify the absorption properties of the modified pulp significantly . In particular, the absorbency of the modified pulp, and subsequently articles prepared therefrom, may be reduced, and the absorption time of modified pulp may be dramatically longer than that of an otherwise comparable pulp . Such modified pulp may be considered water- repel lant , at least compared to a comparable pulp that has not been treated with a hydrophobi zation agent ; water penetration to the pulp network may be dramatically reduced . Such modified pulp may be used for purposes in which the natural absorption properties of the pulp fibers are not desirable , for example in the preparation of single use items and articles used e . g . in packaging, consumer products , cosmetics and/or healthcare . Examples of such items and articles are described below . With the modified pulp, such single use items and articles may have barrier properties against water and/or grease due to the absorption properties of the modified pulp . This may reduce or even obviate the need to add a plastic fi lm or other barrier layer to the item or article . Further, even if the modified pulp may still absorb water to an extent , it may not necessari ly condense but may still maintain its bulk . The single use items or articles may thus have improved durability, in particular when a plastic film or other barrier layer is not added thereto .
With the method, fibers of the pulp may be impregnated with the hydrophobi zation agent efficiently, such that the modified absorbency properties
are still present ( at least to a significant extent ) even after the def ibrillating of the dried pulp into fibers , which process may typically destroy any modifications done to fibers prior to the def ibrillating . The method may be relatively efficient and does not require a complicated or energy consuming process . The modification by the hydrophobi zation agent may also assist in the def ibrillating .
Thus it may be poss ible to produce single use items and other articles in a more environmentally friendly manner .
The modified pulp may be modified def ibrillated pulp . The modified pulp may, in some embodiments , be modified fluff pulp .
In the context of this specification, the term "def ibrillated pulp" may be understood as referring to pulp obtainable by def ibrillating dried ( i . e . dry) pulp . For example , the def ibrillated pulp may be obtainable by def ibrillating according to one or more embodiments described below .
In the context of this specification, the term "fluff pulp" may be understood as it is commonly understood in the field . Fluf f pulp is often made from long fibre softwoods . It is typically intended for applications that require high absorbency, such as a raw material in the absorbent core of personal care products such as diapers , feminine hygiene products , air-laid absorbent towelling, as such, or with superabsorbents and/or synthetic fibres . However, in embodiments that relate to "modified fluff pulp" , the pulp may otherwise have properties similar to regular fluff pulp ( to which no hydrophozation agent has not been added) , but it may have different absorption properties (due to the effect of the hydrophobi zation agent ) , as set out in thi s specification . The method for preparing the modified pulp may be similar to methods for preparing fluff pulp,
and so the modified pulp may have many properties otherwise similar to fluff pulp.
The pulp in the wet pulp may comprise or be pulp obtainable from softwood, such as spruce, pine, fir, larch, Douglas fir or hemlock. Additionally or alternatively, it may comprise or be pulp obtainable from hardwood, such as birch, aspen, poplar, alder, eucalyptus, oak, beech or acacia, or from a mixture of a softwood and a hardwood. The pulp may be e.g. Scandinavian pulp. The pulp may comprise or be pulp obtainable from long fibre softwood (s) . The pulp may be chemical pulp. The pulp may contain, in addition to the cellulose fibers, e.g. hemicellulose and residual lignin, and optionally other components.
The dried pulp may have a dry matter content of about 85 to 99 % (w/w) based on the total weight of the dried pulp, and/or the pulp may be dried so as to have a dry matter content of about 85 to 99 % (w/w) based on the total weight of the dried pulp.
The dried pulp may be understood as referring to the pulp prior to the def ibrillating . The dried pulp may be e.g. in the form of bales or rolls prior to the def ibrillating . For example, the dried pulp may be obtainable in such a form, and it may subsequently be def ibrillated e.g. in a converting line.
The dried pulp may be dried fluff pulp or dried pulp intended or suitable for producing fluff pulp.
The density of the dried pulp may be e.g. in the range of 0.4 - 0.7 cm3/g. The density of the dried pulp may be e.g. in the range of 0.45 - 0.65 cm3/g, or 0.5 - 0.6 cm3/g .
The density may be determined e.g. according to the standard ISO 3034.
The dried pulp may have a bursting strength according to the Mullen method, i.e. a Mullen value, in the range of 350 - 1500 kPa.
The term "def ibrillating" may be understood as referring to mechanically def ibrillating the pulp . The def ibrillating may separate fibers in the pulp from each other . The pulp may thus be def ibrillated into single fibers , or at least partially into single f ibers . This process may also be referred to as defibri zing, defibration and/or defibrillation .
The def ibrillating may be done on the dried pulp in dry form, i . e . the dried pulp may be dry ( in dry form) when def ibrillated .
The defibrillation may be done such that the lengths of the fibers of the pulp are not essentially or significantly shortened by the defibrillation, i . e . the length of the fibers of the pulp is essentially the same before and after the defibrillation . The defibrillation may be done such that the fibers are not disintegrated into fibrils ( at least to a significant extent ) .
The def ibrillating should therefore not be understood as referring to e . g . fibrillation that may result in nanof ibrillar cellulose . The modified cellulose may thus also be understood as not referring to or including nanof ibrillar and/or microfibrillar cellulose .
After the defibrillation, the def ibrillated modified pulp may be used further, for example by forming articles thereof as described below or by forming other products thereof .
The dried pulp may be def ibrillated by shredding . Any suitable shredding device may be used . For example , the pulp may be def ibrillated by a hammer mill . Other shredding devices may be contemplated, for example shredding devices suitable for def ibrillating pulp into fluff pulp . The shredding device may be at least one of a hammer mill , a pin mill , a saw-toothblade , or a briseur .
The hydrophobization agent may, in principle, be any agent capable of hydrophobizing the pulp.
The hydrophobization agent may comprise or be a resin, wax, a wet glue resin, or any mixture or combination thereof.
The resin may be e.g. a hydrophobization resin. An example of such a resin could be e.g. tall oil resin.
The hydrophobization agent may be capable of binding to the pulp by forming hydrogen bonds with the pulp. For example, it may be capable of binding to the pulp by forming hydrogen bonds only (as opposed e.g. to forming a covalent bond with the pulp) .
However, hydrophobization agents capable of binding to the pulp by forming a covalent bond (or covalent bonds) with the pulp may also be contemplated. An example of such hydrophobization agent could be e.g. alkenyl succinic anhydride (ASA) or alkyl ketene dimer (AKD) . Such hydrophobization agents could form e.g. ester bonds with the hydroxyl groups of the cellulose of the pulp.
In an embodiment, the hydrophobization agent consists of a resin (such as a thermoplastic resin) , wax, a wet glue resin, and any mixture or combination thereof .
The hydrophobization agent may comprise or be a thermoplastic resin. In an embodiment, the hydrophobization agent consists of a thermoplastic resin .
The resin, such as a thermoplastic resin, may be e.g. an ovenable resin, i.e. a resin suitable for and/or approved for use in an oven.
The hydrophobization agent may be e.g. a composition comprising one or more components, for example any suitable hydrophobization component described in this specification (such as a resin, wax, a wet glue resin, or any mixture or combination thereof) and optionally water and/or an aqueous solution.
Alternatively or additionally, two or more hydrophobization agents or components may be added separately to the wet pulp.
The hydrophobization agent may be a liquid or in the form of a liquid. In other words, the hydrophobization agent may be water-based. In embodiments in which the hydrophobization agent or composition comprises one or more components that are not fully water-soluble, such components may be e . g . in the form of an emulsion in the hydrophobization agent or composition.
The hydrophobization agent may, in some embodiments, be added to a wet pulp with a pH in the range of 2 - 6. In other words, the pH of the wet pulp may be in the range of 2 - 6 when the hydrophobization agent is added thereto. Alternatively or additionally, the pH may be in the range of 2.5 - 5; or of 2.5 - 5.5; or of 2.5 - 4.5.
The term "wet pulp" may be understood as referring to pulp suspended in water and/or an aqueous solution. In other words, the wet pulp may be e.g. pulp slush. For example, the wet pulp may be pulp at a wet end of a pulp production process (i.e. wet end pulp) . For example, it may be pulp at a wet end of a fluff production process. Thus the hydrophobization agent may be added to the pulp at a wet end.
In other words, the hydrophobization agent may be added to the pulp suspended in water and/or an aqueous solution, such that the water and/or aqueous solution has a pH in the range of 2 - 6, or any other pH described in this specification.
The pulp (wet or dried) may be obtainable by a treatment with a debonder, or it may be treated with a debonder. The debonder may render the pulp more easily def ibrillated . The debonder may be e.g. a surfactant capable of disrupting interfiber hydrogen bonds.
The method may be a method for producing an article. In such a method, the method may further
comprise forming an article of the modified pulp. The article may be formed at least partially of the modified pulp; other components may be included, if desired and/or necessary. The article may be formed e.g. by form pressing or wet pressing. Heat, steam and/or underpressure may be applied to the article when form pressing. However, other suitable methods for forming the article from the modified pulp may be contemplated. The modified pulp described in this specification may be well suited e.g. for form pressing, as the defibrillation allows for pressing and/or otherwise forming the modified pulp into various forms.
A modified pulp obtainable by the method according to the first or second aspect, and according to one or more embodiments described in this specification, is also disclosed.
A modified pulp is also disclosed. The modified pulp may be def ibrillated and exhibit an absorption time of at least 20 seconds. In some embodiments, the modified pulp may exhibit an absorption time of at least 50 seconds, or at least 100 seconds.
The absorption time may be measured using a 3 g sample of the modified pulp, e.g. according to the standard SCAN-C 33:80.
The modified pulp may be obtainable by the method according to the first or second aspect, and according to one or more embodiments described in this specification .
The absorption capacity of the modified pulp may be in the range of 7 - 12 g/g (i.e. 7 - 12 H2O g/g) .
The modified pulp may have a bulk of 16 - 24 cm3/g. In certain embodiments, the modified pulp may have a bulk of 17 - 23 cm3/g, or 19 - 22 cm3/g.
The modified pulp may be modified def ibrillated pulp and/or modified fluff pulp.
The modified pulp may be dry modified pulp (as opposed to being e.g. in the form of a gel) . The dry
modified pulp may have a moisture content of e.g. about 6 - 10 % (w/w) .
An article obtainable from or formed of the modified pulp according to one or more embodiments described in this specification is also disclosed.
The article may be formed at least partially of the modified pulp; other components may be included, if desired and/or necessary. The article may be formed e.g. by form pressing or wet pressing. Heat, steam and/or underpressure may be applied to the article when form pressing. However, other suitable methods for forming the article from the modified pulp may be contemplated .
The article may be an article that is intended not to absorb water and/or grease, at least to a significant extent. Various articles and items may therefore be contemplated.
The article may be a single use article or a single use item. Examples of such articles may include e.g. a container (such as a food container) , a catering item, a casing, a tray, a cup, a utensil, cutlery (such as a fork, a knife, or a spoon) , a plate, or a packaging article. The article may be a filter or an insulator.
The modified pulp and/or articles formed therefrom may, at least in some embodiments, be biodegradable .
A method for producing an article is also disclosed, the method comprising forming the article of the modified pulp according to one or more embodiments described in this specification. The article may be an article according to one or more embodiments described in this specification.
EXAMPLES
Reference will now be made in detail to various embodiments, an example of which is illustrated in the accompanying drawing.
The description below discloses some embodiments in such a detail that a person skilled in the art is able to utilize the embodiments based on the disclosure. Not all steps or features of the embodiments are discussed in detail, as many of the steps or features will be obvious for the person skilled in the art based on this specification.
Figure 1 describes an embodiment of a method for preparing modified pulp.
Pulp in wet format, i.e. wet pulp, is provided at 1, for example as a pulp slush. A hydrophobi zation agent 2 is added to the wet pulp, such that the hydrophobization agent binds to the fibers of the wet pulp at least partially. The wet pulp that has been treated with the hydrophobization agent is then dried at 3 to provide the pulp in a dry format, i.e. as dried pulp, at 4, for example as bales or rolls. In an embodiment, the method may continue futher to a shredding process 5 e.g. at the same site or process. In other embodiments, the pulp in dry format 4 may be e.g. sold to an end user that may then start their own process by obtaining the pulp in dry format 4 and by def ibrillating it at the shredding process 5. A skilled person may thus understand that not all steps of the method depicted in Fig. 1 need take place in the same process or site, but that different steps of the method may be performed by different operators e.g. at different locations.
In the shredding process 5 the pulp in dry format is at least partially def ibrillated into single fibers, resulting in modified def ibrillated pulp 6. The shredding process may be performed mechanically e.g. using a suitable shredding device, such as a hammer mill or a pin mill.
EXAMPLE 1
The properties of regular softwood fluff pulp samples were investigated . In order to reduce dust formation of the fluff pulp, hydrophobi zation agent containing a thermoplastic resin and a paraffin wax (BIM Kemi ) was added to pulp slush either at an amount of 5 kg/t ( sample 5 ) or at 7 kg/t ( sample 7 ) , and the resulting pulp slush was dried . The dried pulp was then def ibrillated using a hammer mill to produce modified fluff pulp . Control sample A was prepared by drying pulp slush to which no hydrophobi zation agent was added and by def ibrillating the dried pulp to produce regular fluff pulp . Sheets were prepared from all samples . Properties of the sheets are shown in Table 1 .
Table 1. Characteristics of sheets prepared from modified (Resin 5 and 7) and unmodified (A) fluff pulp samples.
Resin 5 Resin 7
SHEET CHARACTERISTICS 5 kg/t 7 kg/t
BASIS WEIGHT wet g/m2 726
726
BASIS WEIGHT dry g/m2 685
703
KLEMM mm
5
According to a Mullen test performed to all samples , it appeared that the bursting strength of sheets prepared from modified fluff pulp was lower than that of sheets prepared from unmodi fied fluff pulp . Fiber lengths and fines appeared comparable across all s amp les .
Unexpectedly it was found that the modified fluff pulps exhibited significant water repellency and modified absorption properties . The Klemm test was performed by cutting a 25 cm strip of each sheet and by measuring the length along which the strip absorbed water within 10 min . According to the Klemm test , the modified fluff pulps absorbed less water . Results of other absorption measurements are shown in Table 2 .
Table 2. Characteristics of modified (Resin 5 and 7) and unmodified (A) fluff pulp samples after defibrillation.
A Resin 5 Resin 7
FLUFF CHARACTERISTICS 5 kg/t 7 kg/t
SEC CONDITIONS (rotor/feed/screen) 90/90/8
SEC MJ/t 192 132 111
BULK dry cm3/g 22.0 18.0 16.5
ABS.TIME s 2.7 818 6900
ABS. CAPACITY g/g 10.2 7.7 7.7
NETWORK N 5.83 4.48 4.32
The absorption times (measured according to the standard SCAN-C33 : 80 ) of the modified fluff pulps were dramatically longer than that of the unmodified fluff pulp . The absorption capacities were also reduced to some extent .
Fig . 2 illustrates the absorption time measurements of modified ( left ) and unmodified fluff pulp ( right ) . Cylindrical test pieces of the fluff pulps , having a mass of 3 g and a diameter of 50 mm, were prepared in a test piece former . Test pieces were placed in a vertical position and a load of 500 g was applied . The test pieces were placed on the surface of water in cups as shown in Fig . 2 so that they could absorb water from below . The test pieces of unmodif ied fluff pulp absorbed water within seconds and sank . The test pieces of modified fluff pulps however absorbed water very slowly .
SEC ( shredding energy consumption, i . e . disintegration energy or defibration energy) was lower for the modified fluff pulps , indicating that the modified fluff pulps were softer than the unmodified . The exact SEC values are likely to have been af fected by the measurement conditions ; the SEC values were measured using relatively high rotation speeds ( 4500 rpm) . The bulk measurement indicated that the modified fluff pulps were compressed slightly more when pressed . The network measurements indicated that the strengths of the modified fluff pulps were slightly lower, possibly due to reduced fiber bonds .
It is obvious to a person skil led in the art that with the advancement of technology, the basic idea may be implemented in various ways . The embodiments are thus not limited to the examples described above ; instead they may vary within the scope of the claims .
The embodiments described hereinbefore may be used in any combination with each other . Several of the embodiments may be combined together to form a further embodiment . A method, a product , or a use , disclosed herein, may comprise at least one of the embodiments described hereinbefore . It will be understood that the benefits and advantages described above may relate to one embodiment or may relate to several embodiments . The embodiments are not limited to those that solve any or all of the stated problems or those that have any or all of the stated benefits and advantages . It will further be understood that reference to ' an ' item refers to one or more of those items . The term "comprising" is used in this specification to mean including the feature ( s ) or act ( s ) followed thereafter, without excluding the presence of one or more additional features or acts .
Claims
1 . A method for preparing modified pulp, wherein the method comprises adding a hydrophobi zation agent to wet pulp ; drying the wet pulp, thereby obtaining dried pulp ; wherein the dried pulp is intended for def ibrillating into fibers , thereby obtaining the modified pulp ; or the method further comprises def ibrillating the dried pulp into fibers , thereby obtaining the modified pulp .
2 . A method for preparing modified pulp, wherein the method comprises def ibrillating dried pulp, thereby obtaining the modified pulp ; wherein the dried pulp is obtainable by adding a hydrophobi zation agent to wet pulp and by drying the wet pulp .
3 . The method according to claim 1 or 2 , wherein the modified pulp is modified def ibrillated pulp or modif ied fluff pulp, and/or the dried pulp i s dried fluff pulp .
4 . The method according to any one of claims 1
- 3 , wherein the pulp is def ibrillated by shredding .
5 . The method according to any one of claims 1
- 4 , wherein the hydrophobi zation agent comprises or is a resin, wax, a wet glue resin, or any mixture or combination thereof .
6 . The method according to any one of claims 1
- 5 , wherein the hydrophobi zation agent is added to a wet pulp with a pH in the range of 2 to 6 .
7 . The method according to any one of claims 1
- 6 , wherein the method is a method for producing an article , and the method further comprises forming an article of the modified pulp, optionally by form pressing .
8 . Modified pulp, wherein the modified pulp is def ibrillated and exhibits an absorption time of at least 20 seconds .
9. The modified pulp according to claim 8, wherein the modified pulp is obtainable by the method according to any one of claims 1 - 7.
10. The modified pulp according to claim 8 or 9, wherein the absorption capacity of the modified pulp is in the range of 7 - 12 g/g.
11. The modified pulp according to any one of claims 8 - 10, wherein the modified pulp is modified def ibrillated pulp and/or modified fluff pulp.
12. An article obtainable from or formed of the modified pulp according to any one of claims 8 - 11, wherein the article is optionally form pressed.
13. The article according to claim 12, wherein the article is a single use article or a single use item, such as a container, a catering item, a casing, a tray, a cup, cutlery, a utensil, a plate, or a packaging article; a filter; or an insulator.
14. A method for producing an article, the method comprising forming the article of the modified pulp according to any one of claims 8 - 11.
15. The method according to claim 14, wherein the article is an article as defined in claim 13.
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FI20206014A FI20206014A1 (en) | 2020-10-15 | 2020-10-15 | A method for preparing modified pulp |
PCT/FI2021/050685 WO2022079357A1 (en) | 2020-10-15 | 2021-10-14 | A method for preparing modified pulp |
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EP4229237A1 true EP4229237A1 (en) | 2023-08-23 |
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EP21806299.0A Pending EP4229237A1 (en) | 2020-10-15 | 2021-10-14 | A method for preparing modified pulp |
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US (1) | US20230416988A1 (en) |
EP (1) | EP4229237A1 (en) |
FI (1) | FI20206014A1 (en) |
WO (1) | WO2022079357A1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
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SE432118B (en) * | 1975-02-26 | 1984-03-19 | Moelnlycke Ab | MECHANICAL FLUFF MASS AND SET FOR PREPARATION THEREOF |
SE9601135D0 (en) * | 1996-03-25 | 1996-03-25 | Eka Nobel Ab | Absorbent cellulosic material and production thereof |
US6562192B1 (en) * | 1998-10-02 | 2003-05-13 | Kimberly-Clark Worldwide, Inc. | Absorbent articles with absorbent free-flowing particles and methods for producing the same |
US20050247419A1 (en) * | 2004-05-06 | 2005-11-10 | Hamed Othman A | Treatment composition for making acquisition fluff pulp in sheet form |
US8801901B1 (en) * | 2013-12-30 | 2014-08-12 | Weyerhaeuser Nr Company | Sized fluff pulp |
CA3036697C (en) * | 2016-09-14 | 2020-03-24 | Fpinnovations | Method of transforming high consistency pulp fibers into pre-dispersed semi-dry and dry fibrous materials |
SE541995C2 (en) * | 2017-03-16 | 2020-01-14 | Pulpac AB | Method for forming a cellulose product, cellulose product forming apparatus and cellulose product |
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