EP3455406A1 - Dry processed cellulose fibers for papermaking - Google Patents
Dry processed cellulose fibers for papermakingInfo
- Publication number
- EP3455406A1 EP3455406A1 EP17725138.6A EP17725138A EP3455406A1 EP 3455406 A1 EP3455406 A1 EP 3455406A1 EP 17725138 A EP17725138 A EP 17725138A EP 3455406 A1 EP3455406 A1 EP 3455406A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- composition
- pulp
- dry
- particles
- cellulose
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/25—Cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- 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
-
- 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
-
- 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
- D21H21/22—Agents rendering paper porous, absorbent or bulky
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
- D21H21/52—Additives of definite length or shape
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
- D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/18—Spheres
Definitions
- This disclosure relates to a method to treat cellulose fibers by dry grinding (attrition) to yield cellulose materials suitable for producing desired attributes such as lower density in paperboard products.
- This disclosure relates to cellulose particles produced by dry attrition.
- the cellulose particles may be incorporated into various products. Such products may include paperboard. Paperboard incorporating the cellulose particles is expected to exhibit reduced density.
- Treatment of cellulose fibers is usually done by wet processing methods.
- Wet processing may have certain drawbacks when processing cellulose. For example, excessive wet refining of cellulose pulp may lead to poor drainage of the pulp, which is undesirable on a paper machine.
- the general purpose of the invention is the utilization in a paperboard product of a certain amount of fine cellulose particles that have been produced from dry cellulose fiber, which are produced with dry processing.
- a composition of the paperboard which includes a dry processed collection of cellulose particles having a particle size distribution, wherein 95% of the particles are between 20 microns and 500 microns. In certain embodiments, the cellulose particles show little tendency to hydrate. In certain embodiments, 90% of the particles are between 25 and 350 microns.
- a process for making a cellulosic composition, the process including providing an attritor device; introducing dry cellulose fibers into the attritor device, the dry cellulose fibers having an initial size distribution; subjecting the dry cellulose fibers to communition in the attritor device to create smaller cellulose particles; and collecting the cellulose particles that are below a specific size.
- the specific size is 1000 microns.
- FIG. 1 illustrates a dry attritor device producing a fine cellulose particles from a dry cellulose feed
- FIG. 2 illustrates a paper machine using the fine cellulose particles produced using the dry attritor device of FIG. 1 ;
- FIG. 3 compares median particle sizes achieved using various specific energy inputs for three different types of grinding including an attritor;
- FIG. 4 is a graph of hardwood mean particle diameter at varying amounts of energy input
- FIG. 5 is a graph comparing particle size distributions for control hardwood and dry-attrited hardwood;.
- FIG. 6 is a graph comparing particle size distributions for control softwood and dry-attrited softwood
- FIG. 7 is a graph comparing modulus vs density for softwood pulp with and without addition of dry-attrited pulp
- FIG. 8 is a graph comparing Sheffield Smoothness vs density for softwood pulp with and without addition of dry-attrited pulp
- FIG. 9 shows cross-sectional micrographs of paperboard sheets made with and without addition of dry-attrited pulp
- FIG. 10 is a graph comparing Young's Modulus vs density for bleached softwood pulp with and without addition of dry-attrited bleached softwood pulp;
- FIG. 11 is a graph comparing Young's Modulus vs density for bleached hardwood pulp with and without addition of dry-attrited bleached hardwood pulp;
- FIG. 12 is a graph comparing Young's Modulus vs density for bleached hardwood pulp with and without addition of dry-attrited coated bleached hardwood pulp
- FIG. 13 is a graph comparing Young's Modulus vs density for bleached hardwood pulp with and without addition of dry-attrited unbleached softwood pulp
- FIG. 14 is a graph comparing Young's Modulus vs density for unbleached softwood pulp with and without addition of dry-attrited coated unbleached softwood pulp;
- FIG. 15 is a graph comparing Young's Modulus vs density for OCC pulp with and without addition of dry-attrited semi-chemical hardwood pulp;
- FIG. 16 is a graph comparing Young's Modulus vs density for bleached softwood pulp with and without addition of dry-attrited bleached softwood pulp;
- FIG. 17 is a graph comparing Young's Modulus vs density for bleached hardwood pulp with and without addition of dry-attrited bleached hardwood pulp;
- FIG. 18 is a graph comparing Young's Modulus vs density for bleached hardwood pulp with and without addition of dry-attrited coated bleached hardwood pulp;
- FIG. 19 is a graph comparing Young's Modulus vs density for bleached hardwood pulp with and without addition of dry-attrited unbleached softwood pulp;
- FIG. 20 is a graph comparing Young's Modulus vs density for unbleached softwood pulp with and without addition of dry-attrited coated unbleached softwood pulp;
- FIG. 21 is a graph comparing Young's Modulus vs density for OCC pulp with and without addition of dry-attrited semi-chemical hardwood pulp
- FIG. 22 is a graph comparing Tensile Index vs density for bleached softwood pulp with and without addition of dry-attrited bleached softwood pulp
- FIG. 23 is a graph comparing Tensile Index vs density for bleached hardwood pulp with and without addition of dry-attrited bleached hardwood pulp;
- FIG. 24 is a graph comparing Tensile Index vs density for bleached hardwood pulp with and without addition of dry-attrited coated bleached hardwood pulp;
- FIG. 25 is a graph comparing Tensile Index vs density for bleached hardwood pulp with and without addition of dry-attrited unbleached softwood pulp;
- FIG. 26 is a graph comparing Tensile Index vs density for bleached softwood pulp with and without addition of dry-attrited bleached softwood pulp;
- FIG. 27 is a graph comparing Tensile Index vs density for bleached hardwood pulp with and without addition of dry-attrited bleached hardwood pulp;
- FIG. 28 is a graph comparing Tensile Index vs density for bleached hardwood pulp with and without addition of dry-attrited coated bleached hardwood pulp;
- FIG. 29 is a graph comparing Tensile Index vs density for bleached hardwood pulp with and without addition of dry-attrited unbleached softwood pulp;
- FIG. 30 is a graph comparing Tensile Index vs density for unbleached softwood pulp with and without addition of dry-attrited coated unbleached softwood pulp;
- FIG. 31 is a graph comparing Tensile Index vs density for OCC pulp with and without addition of dry-attrited semi-chemical hardwood pulp;
- FIG. 32 is a graph comparing Sheffield Smoothness vs density for bleached softwood pulp with and without addition of dry-attrited bleached softwood pulp;
- FIG. 33 is a graph comparing Sheffield Smoothness vs density for bleached hardwood pulp with and without addition of dry-attrited bleached hardwood pulp;
- FIG. 34 is a graph comparing Sheffield Smoothness vs density for unbleached softwood pulp with and without addition of dry-attrited unbleached softwood pulp;
- FIG. 35 is a graph comparing Sheffield Smoothness vs density for unbleached softwood pulp with and without addition of dry-attrited coated unbleached softwood pulp.
- FIG. 36 is a graph comparing Sheffield Smoothness vs density for OCC pulp with and without addition of dry-attrited semi-chemical hardwood pulp.
- FIG. 1 is a simplified drawing of an attritor 110 for dry processing of cellulose pulp. This is one of several methods for dry processing, and others exist including vibratory ball mills and conventional ball mills.
- the attritor includes a shell or housing 120 with an internal volume in which the processing takes place. If continuous mode processing is used, cellulose fibers (not shown) are fed into attritor 110 by way of inlet conduit 160 and removed from the attritor by outlet conduit 170.
- a screen or other classification device 180 may be used to permit removal of only particles below a desired size.
- One or more flow control valves 190 may be used. Batch processing is also possible in which case the process is discontinuous.
- An impeller shaft 130 rotates at high speed within the housing 120.
- Attached to shaft 130 are rods 140 that spin with the shaft and drive a large number of attritor media 150 such as ceramic or metal balls.
- the attritor media 150 collide with each other, with arms 140, and with the inner wall of housing 120.
- the cellulose fibers in the attritor are impacted by the collisions between the media 150, rods 140, and attritor wall. This results in the cellulose fibers being comminuted (made smaller) during their residence time in the attritor.
- Attritor 1 10 may be provided in any desired volume, with appropriately sized shaft 120 and rods 130, and driven by a suitably powerful motive force such as an electric motor. If desired, provision may be made for cooling the attritor or for introducing other materials besides cellulose fibers, for example gases, additives, catalysts, etc. Multiple attritors may be used in parallel and/or in series.
- Attritor 110 used in this work was made by Union Process of Akron, Ohio.
- dry-attrited cellulose particles produced by attritor 1 10 of FIG. 1 may be included in the pulp feed to a paper machine such as the device shown in FIG. 2.
- a forming wire 210 in the form of an endless belt passes over a breast roll 215 that rotates proximate to a headbox 220.
- the headbox provides a fiber slurry (that may include attrited cellulose particles) in water with a fairly low consistency (for example, about 0.5% solids) that passes onto the moving forming wire 210.
- a first distance 230 water drains from the slurry and through the forming wire 210, forming a web 250 of wet fibers.
- the slurry during distance 230 may yet have a wet appearance as there is free water on its surface. At some point as drainage continues the free water may disappear from the surface, and over distance 232, water may continue to drain although the surface appears free from water.
- the dry-attrited cellulose particles could be added at a secondary headbox, size press, coater, and other locations on the paper machine.
- the web is carried by a transfer felt or press felt through one or more pressing devices such as press rolls 240 that help to further dewatering the web, usually with the application of pressure, vacuum, and sometimes heat.
- the still relatively wet web 250 is dried, for example using dryer or drying sections 260, 262 to produce a dry web ("raw stock") 270 which may then be run through a size press 280 that applies a surface sizing to produce a sized "base stock" 295 which may then be run through additional dryer sections 298 to produced dry base stock 299 that continues on for further processing (not shown).
- Attritors may be run in batch, semi-batch, or continuous modes depending upon the applications.
- cellulose particles were prepared in a semi-continuous mode.
- the attritor media 150 were 3/8" diameter ceramic balls.
- Pulp flakes of 3 ⁇ 4" x 3 ⁇ 4" size were added to the attritor and processed for a given period of time, usually 15 minutes.
- the resulting cellulose powder was sieved through a bottom opening in the attritor.
- the cellulose powder was weighed and a corresponding make-up amount of pulp flakes were replenished into the attritor.
- FIG. 4 shows a graph of the correlation between energy input in the attritor and the particle size reduction of a commercial once-dried hardwood market pulp. No dispersants were added during measurement of the particle size distribution, so agglomeration tendencies might be greater than is sometimes seen in protocols where dispersants are added prior to measurement. Particle sizes were measured by a Microtrac particle size analyzer.
- Figure 5 shows particle size distributions for standard hardwood (510) and semi-continuous attritor hardwood (520) at an energy input of approximately 70 hpdt (horsepower-days per ton). All samples were diluted to an approximate 1 % solution then tested in a Microtrac particle size analyzer. Each sample was first sonicated for 1 minute prior to introduction into the measurement cell, and no dispersant was used.
- the particle size distribution which is bimodal for the control pulp 510 is unimodal for the attritor pulp 520.
- the presence of a large peak around 100 ⁇ might possibly be explained by association factors during measurement solution.
- Substantially all of the attritor pulp falls between 10 and 1000 microns.
- About 95% of the attritor pulp is between (approximately) 13 and 990 microns, about 90% is between 18 and 750 microns, and about 80% between 24 and 600 microns.
- sample 7 was similar to sample 6, except additional energy was applied by increasing the processing time. With sample 7 the material became small enough to be electrically charged and form an aerosol (dry dust). If the cellulose is attrited to such a degree, care should be taken in case it might form an explosive dust in which case proper equipment grounding and suitable dust collection devices should be used.
- Table 2 shows results where dry-attrited pulp was added to four base softwood pulps made with varying degrees of refining (refining levels 0-3), as reflected in their Canadian Standard Freeness (CSF) values.
- the base pulps had CSF values ranging from 743 to 570 achieved by reducing the gap between the refiner plates.
- the added dry-attrited pulp was pine that was treated in the dry attritor at approximately 85 horsepower-days per ton without any catalyst.
- Each row in Table 2 shows the sample name, the CSF of the base softwood pulp, and the density, modulus, and Sheffield Smoothness of handsheets.
- Each group of three data points includes a row with no added attritor pulp, a row with 10% added attritor pulp, and a row with 20% added attritor pulp. In each group, as attritor pulp percent increased, the density and modulus decreased, while the Sheffield Smoothness increased.
- the handsheets were not coated and therefore might correspond approximately to an uncoated, partially pressed stage on a paper machine.
- Figure 7 shows the graph of modulus vs. density for the handsheets of Table 2.
- the curve (710) to the right is for no addition of dry-attrited pulp.
- the middle curve (720) is for 10% addition of dry-attrited pulp, and the left curve (730 is for 20% addition of dry-attrited pulp.
- the middle curve (820) is for 10% addition of dry-attrited pulp
- the upper curve (830 is for 20% addition of dry-attrited pulp.
- FIG. 9 shows scanning electron microscope (SEM) micrographs of handsheet cross-sections without dry-attrited pulp and with 20% dry-attrited pulp. All SEM's are shown with a 100 micron scale bar. It is clear that the sheets with 20% dry-attrited pulp are noticably thicker (less dense) than control sheets with only normal pulp. Additional samples were prepared as indicated in Table 3 using additional base sheet pulp and attritor-dried pulp combinations, including bleached softwood and hardwood, unbleached softwood, and OCC base sheet pulps, along with bleached softwood and hardwood, coated bleached hardwood, coated and uncoated unbleached softwood, and semi-chemical hardwood attritor-treated dry pulp.
- SEM scanning electron microscope
- the lower density sheets appear to be particularly sensitive to a roughening effect as noticed by a considerable increase in Sheffield Smoothness with no impact of refining the main fibers on the smoothness properties of the sheet.
- Such lower density sheets might be utilized as a base ply in a multi-ply product, or might be processed (for example with one or more coatings) to achieve desired product smoothness.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201662335935P | 2016-05-13 | 2016-05-13 | |
PCT/US2017/032648 WO2017197384A1 (en) | 2016-05-13 | 2017-05-15 | Dry processed cellulose fibers for papermaking |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3455406A1 true EP3455406A1 (en) | 2019-03-20 |
Family
ID=58745517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17725138.6A Withdrawn EP3455406A1 (en) | 2016-05-13 | 2017-05-15 | Dry processed cellulose fibers for papermaking |
Country Status (5)
Country | Link |
---|---|
US (1) | US20190119854A1 (en) |
EP (1) | EP3455406A1 (en) |
CN (1) | CN109196165A (en) |
BR (1) | BR112018070779A2 (en) |
WO (1) | WO2017197384A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR102018075755A2 (en) * | 2018-12-11 | 2020-06-23 | Suzano Papel E Celulose S.A. | FIBER COMPOSITION, USE OF THE REFERRED COMPOSITION AND ARTICLE THAT UNDERSTANDS IT |
USD980069S1 (en) | 2020-07-14 | 2023-03-07 | Ball Corporation | Metallic dispensing lid |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1910406A (en) * | 1930-05-24 | 1933-05-23 | Brown Co | Cellulose composition |
AR202657A1 (en) * | 1974-08-12 | 1975-06-30 | Witcel Sa | PROCEDURE FOR THE PREPARATION OF COTTON OR WOOD PASTA |
US5227024A (en) * | 1987-12-14 | 1993-07-13 | Daniel Gomez | Low density material containing a vegetable filler |
AT410683B (en) * | 2001-12-06 | 2003-06-25 | Andritz Ag Maschf | Pulping, for paper and card, involves steam disintegration, and dry-grinds fibers with a specified initial dryness |
US8349443B2 (en) | 2006-02-23 | 2013-01-08 | Meadwestvaco Corporation | Method for treating a substrate |
RU2374374C1 (en) * | 2006-09-12 | 2009-11-27 | Мидвествако Корпорейшн | Carton containing micro-lamellate cellulose particles |
US8142887B2 (en) | 2008-03-21 | 2012-03-27 | Meadwestvaco Corporation | Basecoat and associated paperboard structure |
US20130012857A1 (en) * | 2010-03-16 | 2013-01-10 | North American Rescue, Llc | Wound Dressing |
WO2013015132A1 (en) * | 2011-07-25 | 2013-01-31 | 花王株式会社 | Method for manufacturing pulverized material and vibrating pulverizer |
US8916636B2 (en) | 2013-03-14 | 2014-12-23 | Meadwestvaco Corporation | Basecoat composition and associated paperboard structure |
CN104974357B (en) * | 2014-04-10 | 2018-04-20 | 中国科学院理化技术研究所 | Uvioresistant sheet-like cellulosic materials and its preparation method and application |
-
2017
- 2017-05-15 BR BR112018070779A patent/BR112018070779A2/en not_active Application Discontinuation
- 2017-05-15 WO PCT/US2017/032648 patent/WO2017197384A1/en unknown
- 2017-05-15 US US16/096,839 patent/US20190119854A1/en not_active Abandoned
- 2017-05-15 EP EP17725138.6A patent/EP3455406A1/en not_active Withdrawn
- 2017-05-15 CN CN201780029612.5A patent/CN109196165A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2017197384A1 (en) | 2017-11-16 |
BR112018070779A2 (en) | 2019-02-12 |
US20190119854A1 (en) | 2019-04-25 |
CN109196165A (en) | 2019-01-11 |
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