CN105378179A - Method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet stregnth and enhancing filler retention in papermaking - Google Patents
Method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet stregnth and enhancing filler retention in papermaking Download PDFInfo
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- CN105378179A CN105378179A CN201480031469.XA CN201480031469A CN105378179A CN 105378179 A CN105378179 A CN 105378179A CN 201480031469 A CN201480031469 A CN 201480031469A CN 105378179 A CN105378179 A CN 105378179A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
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- 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
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- 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
- D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
- D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
- D21H17/45—Nitrogen-containing groups
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
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- 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
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The invention provides a method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in a papermaking process The method improves the efficiency of drainage aids or wet web strength aids or wet strength aid by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a those additives. The drainage additive or wet web strength additive or wet strength aid holds the cellulose fibers together tightly and is not wasted on the filler particles.
Description
Background technology
The present invention relates to the method improved dewatering efficiency in paper-making process, improve scraps of paper wet web strength, improve scraps of paper wet strength and reinforcer confining force.Usually, in paper-making process, in wet end, add chemicals to help de-watering of slurries, improve confining force and to improve wet web strength or dry web strength.The wet end of paper technology refers to that in paper technology, fiber is distributed to the stage in water in slurry form.Then fiber-water slurry is through drainage arrangement and dewatering process, forms wet web.Solids content after this wet web formation process is about 50%.Further dry wet paper web also forms the dry plate of paper washer (papermat).Paper washer comprises water and solid, and generally contains the water of 4% to 8%.The solid portion of paper washer comprises fiber (being generally cellulosic fibre), and can comprise filler.
Filler during paper technology, is added to paper washer with the mineral grain of the opacity and reflective that strengthen gained paper.At United States Patent (USP) the 7th, in 211, No. 608, describe some examples of filler.Filler comprises for increasing opacity or brightness, minimizing porosity or reducing the inorganic particle of cost of Paper or cardboard sheet and organic granular or pigment.Some examples of filler comprise following in one or more: kaolin, talcum, titanium dioxide, aluminium hydroxide, barium sulfate, magnesium hydroxide, pigment (such as calcium carbonate) etc.
Pearl filler adopts two kinds of form: GCC (grinding calcium carbonate) and PCC (winnofil).GCC is naturally occurring calcium carbonate rock, and PCC is the calcium carbonate that synthesis is produced.Because PCC has larger specific area, so PCC has stronger light scattering property and provides better optical property for gained paper.But by the same token, the paper that the paper washer that PCC fills is produced is weaker than the paper that GCC fills in dry strength, wet strength and wet web strength.
Filler is usually much smaller than fiber, and therefore, filler has the specific area more much bigger than fiber.It is found that one of challenge improving filer content in the scraps of paper is the efficiency that high filler content reduces wet-end chemicals, the such as efficiency of chemical conditioner, wet web strength auxiliary agent and wet strength auxiliary agent.The present invention will provide new filler pre-treatment, with the absorption making it reduce wet-end chemicals on filling surface, thus improves the efficiency of wet-end chemicals (such as chemical conditioner, wet web strength auxiliary agent and wet strength auxiliary agent).
Paper wet web strength is very crucial for paper production business, because the paper wet web strength improved can increase the maneuverability of machine and reduce scraps of paper fracture and machine stopping time.Paper wet web strength is the quantity of the key formed between the crossed fiber of paper washer and the function of intensity.The filler particles with large surface area more may be combined with those fibers, and affects quantity and the intensity of those keys.Because the surface area of PCC filler is comparatively large, so PCC filler have impact on those keys more than GCC.
Paper dewatering efficiency is also very crucial for paper production business, because the reduction of dewatering efficiency can increase the demand to steam in drying process in wet web, reduces machine speed and production efficiency.Widely use chemical conditioner to improve dewatering efficiency, to reduce energy consumption, to improve machine speed and production efficiency.
Summary of the invention
In order to meet determine long-term above but unsolved needs, at least one embodiment of the present invention relates to a kind of papermaking process comprising filler, said method comprising the steps of: the blend of filler particles, at least one draining additive or wet web strength additive or wet strength auxiliary agent and cellulose fibre storing are provided
When lacking cellulose fibre storing with filler particles described in composition of matter process,
Described filler particles and described cellulose fibre storing are combined,
Combine described at least one wet strength auxiliary agent or wet web strength additive or draining additive treating, and
Paper washer is combined to form by described,
Wherein the described filler particles of at least 10% is winnofil, and the described filler particles of at least 10% is grinding calcium carbonate (GCC), described cellulose fibre storing comprises multiple cellulose fiber peacekeeping water, and described composition of matter strengthens the performance of wet strength auxiliary agent or wet web strength additive or draining additive in described paper washer.
And wherein utilize rotation mixing device that composition of matter described at least some is added into described filler, described device has dispensing head, it is rotated by driver, be arranged in the container of the slurry containing described filler particles, and join (associatedwith) with Plane of rotation, and described dispensing head has distributed outlet along its girth around rotating shaft, described composition is passed into described slurry and hybrid blade from distributed outlet, it is characterized in that described outlet is formed as opening, and described hybrid blade is formed as extending laterally to described Plane of rotation and has the band of the length of at least half of the internal diameter of the pipe equaling described slurry,
And to described dispensing head send described composition for by described composition blending to described filler slurry.
Other Characteristics and advantages describes herein, and middle by apparent from the following specifically describes.
Accompanying drawing explanation
The present invention is described in detail with reference to accompanying drawing below by way of concrete, wherein:
Fig. 1 is the cross section diagram of the equipment of slurry for the present invention being fed into filler particles.
Fig. 2 is the exploded view of the sectional view of the equipment of slurry for the present invention being fed into filler particles.
In order to object of the present disclosure, unless otherwise noted, otherwise Reference numeral identical in accompanying drawing should refer to identical feature.Accompanying drawing is only the example of principle of the present invention and is not intended to make the present invention be limited to shown particular implementation.
Detailed description of the invention
At least one embodiment of the present invention manufactures the method comprising the paper of filler.In at least one embodiment of the present invention, papermaking process comprises the following steps: the filler blends producing PCC and GCC, wherein PCC accounts at least 10% of packing quality and GCC accounts at least 10% of packing quality, with coating preliminary treatment at least some filler particles, described coating reduces wet web strength additive or drainage aids or the adhesion between wet strength auxiliary agent and filler particles, and filler blends and wet web strength additive or drainage aids or wet strength auxiliary agent is added in paper washer.
Knownly wet web strength additive or drainage aids or wet strength auxiliary agent added the wet web strength that can strengthen gained paper in paper washer or strengthen draining or improve machine speed and maneuverability or strengthen scraps of paper wet strength.At United States Patent (USP) 7,125,469,7,615,135 and 7,641, describe some examples of wet strength auxiliary agent, wet web strength additive and drainage aids in 776.
Unfortunately, a large amount of wet strength auxiliary agent or wet web strength additive or drainage aids is not added in practice to compensate the reduction that in paper washer, mass filler causes.A reason is because those additives are very expensive, and uses a large amount of additive can cause commercial infeasible production cost.In addition, add too much additive and have negative effect to papermaking process and the operability suppressing various forms of paper making equipment.And cellulose fibre only can absorb limited amount wet strength auxiliary agent or wet web strength additive or drainage aids.This causes restriction to using how many additives.Cause such a reason be because wet strength auxiliary agent or wet web strength additive or drainage aids be easy in and anion fiber/filler electric charge, and when these electric charges are neutralized, the further absorption of those additives is suppressed.
The efficiency that filler also reduces wet strength auxiliary agent or wet web strength additive or drainage aids is added in paper washer.Those additives are easy to coated filler particles.The filler particles existed is more, and the additive of coated filler particles is more, therefore can be used for the wet strength auxiliary agent that combined by cellulose fibre or wet web strength additive or drainage aids and tails off.Because there is the maximum of a wet strength auxiliary agent that can add or wet web strength additive or drainage aids, so more filler always means less active strength additive.More obvious than GCC by this effect of PCC, because the larger surface area ratio GCC of PCC applies more additive.
In at least one embodiment of the present invention, with composition of matter preliminary treatment at least some filler particles, adhere to filler particles to prevent wet strength auxiliary agent or wet web strength additive or drainage aids at least partly.Preliminary treatment hope composition of matter applies some or all one or more filler particles completely.Or one or more filler particles composition of matter being only applied to a part are wished in preliminary treatment, or wish to apply some filler particles completely and some other particles composition of matter being only coated with a part.In at least one embodiment, with United States Patent (USP) the 5th, at least some composition of matter described in 221, No. 435 carries out preliminary treatment, and is specially wherein said band cationic charge material.In at least one embodiment, with United States Patent (USP) the 6th, the dibasic ammonium halide-acrylamide copolymer of the diallyl-N described in 592, No. 718, N-carries out preliminary treatment.
Although pretreated filler particle is known in the art, the art methods of pretreated filler particle does not relate to the adhesion affecting wet strength auxiliary agent or wet web strength additive or drainage aids and filler particles.In fact, many prior art preliminary treatment add the adhesion of strength additive and filler particles.Such as, United States Patent (USP) the 7th, 211, No. 608 describe the method using hydrophobic polymer pretreated filler particle.But this preliminary treatment is inoperative to the adhesion between strength additive and filler particles, and only repel the excessive water that absorbs to offset strength additive of water.On the contrary, present invention reduces wet strength auxiliary agent or wet web strength additive or the interaction between drainage aids and filler particles, cause paper intensity, the scraps of paper to dewater and the unforeseeable increase of machine maneuverability.
When the tensile strength of more given paper to account for the percentage of the total solid part of producing given paper paper washer used to filler, result clearly illustrates that the scraps of paper have extremely weak wet strength when not adding wet strength auxiliary agent 63700 (interim wet strength auxiliary agent).Velox (Velox) can significantly increase scraps of paper wet strength.Independent filler pre-treatment does not increase scraps of paper wet strength.But filler pre-treatment strengthens velox performance further, this causes higher scraps of paper wet strength.
When the wet web tensile strength of more given paper to account for the percentage of the total solid part of producing given paper paper washer used to filler, increasing filer content and reducing between paper wet web strength is linear relationship.When not adding nail (unit of length) section chemical conditioner (wet web strength auxiliary agent) 63700, the scraps of paper have very poor wet web strength.Scraps of paper wet web strength can be significantly improved by using nail (unit of length) section chemical conditioner 63700.Independent filler pre-treatment does not almost affect paper wet web strength.But filler pre-treatment can strengthen the performance of nail (unit of length) section chemical conditioner 63700 further, and improved by the wet strength that can realize extra 20% compared with the filler pre-treatment of low ash content.For higher content of ashes, the performance of 63700 even strengthens and is greater than 20%.Alleviated this is because be decreased through filler pre-treatment for the efficiency of the strength additive of filler particles.
At least some filler that the present invention is contained is known and commercially available.They comprise for increasing opacity or brightness, minimizing porosity or any inorganic or organic granular of cost or the pigment that reduce Paper or cardboard sheet.The most frequently used filler is calcium carbonate and clay.But talcum, titanium dioxide, aluminium hydroxide, barium sulfate and magnesium hydroxide are also suitable filler.Calcium carbonate comprises in drying or the grinding calcium carbonate (GCC) of dispersed paste form, chalk, the winnofil (PCC) of any form and the winnofil in dispersed paste form.Usual use acrylic acid polymer dispersant or polyphosphate sodium dispersant produce the dispersed paste form of GCC or PCC.These dispersants give calcium carbonate granule obvious negative electrical charge separately.Kaolin slurry also uses acrylic acid polymer or polyphosphate sodium dispersion.
In at least one embodiment, the composition of matter of process is United States Patent (USP) 6,592, and any one or combination of the composition of matter described in 718.Particularly, any AcAm/DADMAC copolymer compositions wherein described in detail is suitable as treated substance composition.The example of AcAm/DADMAC copolymer compositions is the product #Nalco-4960 (hereinafter referred to as 4690) from Ondeo Nalco Co. of Illinois Naperville (Naperville, Illinois).
The composition of matter of process can be coagulant.The coagulant that the present invention is contained is known and commercially available.They can be inorganic or organic.Representational inorganic coagulant comprises alum, sodium aluminate, polyaluminium chloride or PAC (also referred to as chlorination hydroxyl aluminium, the aluminium base chloride of hydroxyl and poly-polymeric aluminum chloride), Sulfated polyaluminium chloride, polysilicate sulfuric acid aluminium, ferric sulfate, iron chloride etc. and their blend.
Some the organic coagulant being applicable to treated substance composition are formed by polycondensation.The polymer that example comprises epichlorohydrin-dimethylamine (EPI-DMA), EPI-DMA ammonia is cross-linked of the polymer of the type.
Other coagulant being applicable to treated substance composition comprises the polymer of dichloroethylene and ammonia or adds or do not add the polymer of the dichloroethylene of ammonia and dimethylamine, the condensation polymer of polyfunctional amine (such as diethylentriamine, tetren, hexamethylene diamine etc.) and dichloroethylene and the polymer be made up of the condensation reaction of such as melamine resin.
Other coagulant being applicable to treated substance composition comprises the vinyl-addition polymer of band cationic charge, such as (methyl) acrylamide, diallyl-N, the dibasic ammonium halide of N-, dimethyl amino ethyl methacrylate and quaternary ammonium salt thereof, dimethyl amino ethyl acrylate and quaternary ammonium salt thereof, methacryiamidopropyl chloroform ammonium, diallyl methyl (β-propionamido) ammonium chloride, (Beta-methyl acryloyl-oxyethyl) trimethylammoniumethyl sulfate, quaternised polyvinyl base lactam, vinyl amine, react the polymer generating Mannich or quaternary Mannich derivative, copolymer and trimer.Preferred quaternary ammonium salt can use chloromethanes, dimethyl suflfate or benzyl chloride to prepare.Trimer can comprise anionic monomer, such as acrylic acid or 2-acrylamido 2-methyl propane sulfonic acid, as long as whole electric charge is cationic on polymer.The molecular weight ranges comprising these polymer of vinyl addition and condensation is paramount to millions of from being low to moderate hundreds of.Preferably, molecular weight ranges should from about 20,000 to about 1,000,000.In at least one embodiment, by being described as carrying out preliminary treatment for the one in the described composition of matter of the applicable composition of matter of pretreated filler particle, some or all combinations arbitrarily.
In at least one embodiment, wet strength auxiliary agent or wet web strength additive or drainage aids carry identical electric charge with the composition of matter being applicable to process filler particles.When both carry identical charges, the possibility that wet strength auxiliary agent, wet web strength additive or drainage aids are adsorbed onto on its surface by filler additive is lower.Wet strength auxiliary agent, wet web strength additive or drainage aids that the present invention is contained comprise United States Patent (USP) 4,605,702 and U.S. Patent application 2005/0161181A1 described in any one in composition of matter, particularly wherein said various glyoxalated acrylamide/DADMAC copolymer compositions.The example of glyoxalated acrylamide/DADMAC copolymer compositions is product # nail (unit of length) section 63700 (being produced by Ondeo Nalco Co. of Illinois Naperville).Another example is the polymer containing amine, comprises allylamine/acrylamide copolymer and polyvinylamine; Another example is polyamide-polyamine-chloropropylene oxide (PAE).
In at least one embodiment, filler used is PCC, GCC and/or kaolin.In at least one embodiment, filler used is containing PCC, GCC of acrylic acid polymer dispersant and/or kaolin or their blends.Wet strength additives or wet web strength auxiliary agent or draining additive can be paper washer 3kg additive per ton relative to the ratio of solid paper washer.
In at least one embodiment, the filler particles of at least some uses and rotates mixing device preliminary treatment.Rotate mixing device and comprise dispensing head, it is constructed and is arranged to will rotate when process chemicals is dispersed to filler particles by it.In at least one embodiment, rotating mixing device is United States Patent (USP) 5,993, and the equipment described in 670.This device can make the blending of (multiple) flocculant liquid to process stream, in pipe/pipeline that the slurry that the dispensing head wherein rotated by driver is arranged in filler particles can flow through, and join with Plane of rotation, and described dispensing head has the outlet of distributed flocculant and hybrid blade along its girth around rotating shaft, and is connected with flocculant liquid delivery pipeline.
In at least one embodiment, the invention still further relates to the device using blending flocculant liquid, it is formed by the mixture of activating agent and water and its n part is added to the filler slurry of 100 parts, wherein flocculant liquid is added to the slurry of the activating agent containing necessary amount of 100 parts.
There is such situation, when the device for blending is positioned at the downstream of sending pump or centrifuge on the direction of extender paste stream, it can obtain good result to flocculant liquid and being mixed with each other of filler.But, when be not this situation and when mixing device fail to realize flocculant liquid and filler gratifying mix time, there is noticeable multiple situation.In the known devices (DE-054029824) of the above-mentioned type, flocculant outlet is formed as hole or nozzle, and each hybrid blade is formed as axle journal sample (journal-like) projection, the size of wherein hybrid blade and outlet is transverse to very little compared to the width of extender paste stream on the direction of Plane of rotation.In some cases, the flocculant liquid obtained with this device and the blending of slurry are insufficient, that is, the flocculant liquid added can not to be distributed in the stream of slurry at device rear and sufficiently uniformly not to be contained in slurry for the amount needed for gratifying flocculation.
Therefore, object of the present invention is the device of the above-mentioned type, utilizes this device can realize the blending of better flocculant liquid and slurry.Feature according to the device of the present invention realizing this object is, flocculant outlet is formed as slit and hybrid blade is formed as band, and it extends laterally to Plane of rotation and has the length of at least half of the width equaling stream of slurry.
In at least one embodiment, whirligig is utilized to add only a kind of, the some or all of chemicals added in pretreating process.
In at least one embodiment, the structure of the dispensing head of device allows to realize blending that flocculant liquid improves in the slurry and distribution.Flocculant liquid is discharged from each slit with the form of wide band, and hybrid blade subsequently inserts in slit on direction opposite to the direction of rotation, and slit is along its edge tractive flocculant liquid, passes through slurry with fuzzy strips.By flocculant liquid delivery by slit, enter in slurry with the turbulence form of interrupting, and slit and band are arranged in a rotational direction one by one.The dimensioning of the length of slit and blade is realized according to the diameter of stream or dispensing head.
In at least one embodiment, flocculant slit and ribbon blade can extend on the direction of stream of slurry and on the direction being substantially perpendicular to stream of slurry.Another embodiment of the invention is possible, and wherein the rotating shaft of mixing head is with extension angled with stream of slurry.But in general, the Plane of rotation of mixing head extends substantially on the direction of stream of slurry.
Each slit is made up of such as two or more slotted portion be arranged in line.But when each slit is continuous print along its whole length, this is effective especially and favourable.This prevents the undesirable high velocity of discharge of blocking and flocculant liquid.
Each ribbon hybrid blade is such as scattered in radial incision along its length with comb shape.But when each ribbon hybrid blade is continuous print in its whole length, this is effective especially and favourable.This improves the rigidity of ribbon hybrid blade and improves hybrid directional.
The cross section of each exit slot can change amount to be used for controlling the flocculant liquid occurred along its length.When watching along its length towards centre, when the cross section of each exit slot increases, this is effective especially and favourable.This shape of exit slot is utilized, because many than in side of the slurry in the middle of the slurry pipe when slit extends transverse to stream direction.Under uniform slot width, realize flocculant to be delivered to equably in slurry.
In at least one embodiment, the slit forming the outlet of flocculant liquid has the width of such as 7mm to 9mm.The amount of the flocculant liquid sent in chronomere is more, and slit is wider, and the amount of the flocculant liquid sent in chronomere is fewer, and slit is narrower.
When the edge of each ribbon hybrid blade extends on the direction almost parallel with the Internal periphery of slurry pipe, when being formed in space therebetween, this is effective especially and favourable.The ribbon hybrid blade of the prolongation extended diametrically improves blending operation.But space should be retained between hybrid blade and slurry pipeline, space is enough large to allow the stone be present in slurry to pass through.
This space is particular importance, and space is larger when ribbon hybrid blade extends transverse to stream.When ribbon hybrid blade extends transverse to stream, space is in the direction of the axis of rotation preferably than little transverse to the space on the direction of rotating shaft.
When the direction of rotation of dispensing head driver can be changed, obtain embodiment effective and favourable especially of the present invention.In a device in accordance with the invention, hybrid blade is relatively large or give prominence to relative to slurry pipe cross section, if make dispensing head rotate in the same direction for a long time, then exists and to be blocked by lump and danger that fiber or silk thread are built up.Rotation in the opposite direction prevents this type of blocking and builds up.
Such as, one, two and/or the outlet of more flocculant can be provided between two hybrid blades.But, when exit slot and ribbon hybrid blade in a rotational direction alternately time, this is effective especially and favourable.This also improves blending technique.On dispensing head, provide two or more exit slots and two or more ribbon hybrid blades in a rotational direction.
When cross section in slurry pipe in the region of dispensing head be similar to slurry pipe other in cross section time, this is effective especially further and favourable.Thus the increase of the flow velocity of the narrow and relative slurry of slurry pipe is eliminated according to device of the present invention.Dispensing head has formed the narrow more greatly of the cross section that can be used for slurry.
When dispensing head is formed as cylindrical cross section and/or at least equals the slurry pipe internal diameter of 0.4 when the external diameter of dispensing head, this is effective especially and favourable.This simplify structure and improve the rigidity of dispensing head, wherein the shape representation of exit slot and ribbon hybrid blade is to the requirement of the increase of dispensing head rigidity.
When dispensing head passes in the tube connector of rotatable support, form embodiment effective and favourable especially of the present invention, described tube connector extends to the direction away from slurry pipe and it is connected to driver and flocculant liquid delivery pipeline, and be provided with entrance further and be rotatablely supported in junction chamber, and flocculant liquid delivery pipeline opens wide to junction chamber.This mode of flocculant liquid delivery to rotatable dispensing head is allowed to guarantee the rigidity increase of tube connector and support of its use simple Devices.Because " rubble " of ribbon hybrid blade and slurry pipe cooperates, this becomes possibility in a device in accordance with the invention.
Satisfactory by exit slot in order to make to send (multiple) flocculant liquid, the stream cross section that can be used for (multiple) flocculant liquid is very important.In an embodiment of the invention, all outlet ports slit has the little cross section of stream cross section before than flocculant liquid together.The whole cross section of entrance is not less than the stream cross section sending in pipeline and in tube connector.Stream cross section in dispensing head and in tube connector is similar.Tube connector can optimize the stream cross section of flocculant liquid in the layout in room that is tightly connected.
When check-valves is arranged in flocculant liquid delivery pipeline, when the flocculant liquid before check-valves is not under pressure, such as, when flocculant liquor pump does not operate, slurry can enter in exit slot, and this is effective especially and favourable.When the flocculant liquid from flocculant liquor pump is no longer under pressure, the seal in junction chamber and bearing keep using flocculant hydrodynamic lubrication.
When dispensing head is with 700 revs/min to 2,500 revs/min, when preferably the rotary speed of 1,000 rev/min to 2,000 rev/min drives, obtain embodiment effective and favourable especially of the present invention.Under this relatively high rotary speed, blending and the distribution of the improvement of flocculant liquid needed in slurry occur.When rotary speed too low (lower than 500 revs/min), the band of flocculant liquid or stream stop.But high speed needs too high expense to realize required effect.In the known devices (DE-054029824) of the above-mentioned type, available flocculant is stored in reservoir.To in liquid or powder type can flocculant to add fresh water to obtain the flocculant mother liquor of about 1% be further known (DE-053901292).Then flocculant mother liquor is mixed in the supplementing water of packing station with 4 parts by volume to 10 parts by volume, to obtain the flocculant in so-called trade solution form.By this flocculant be added to the amount of the filler slurry of slurry 18% to 20% amount add, that is, by the filler particles being added to 100 parts in the flocculant liquid of flocculant form of about 20 parts.At this, containing flocculant slurry (i.e. condition filler) containing 1/6 the flocculant liquid additionally added by blending and the liquid added.
In known applications, the extra process for flocculant will use large water gaging, and this is expensive.For process, except the device for obtaining mother liquor, also need the device for obtaining trade solution, this causes the extra charge relevant to device and drives relevant extra charge with device.Send flocculant and water thereof until they mix with slurry, and send and need energy, this is expensive.The water component of flocculant must be delivered to filter press together with slurry, by filter press, finally purifying again.Therefore, in known applications, the aqueous phase contained by the extra expense increased and flocculant liquid closes.
Therefore, the object of the invention is to improve technique mentioned above to save and to use flocculant liquid or increase the relevant expense of its water content.According to the present invention, achieve this end to make needing the flocculant liquid providing maximum 3 tons to carry out body for 100 tons of filler slurries by designing above-mentioned device according to the present invention.
Find, use and allow when not eliminating blending to the water component saving flocculant liquid when the effect of the flocculant liquid of slurry according to the dispensing head of device of the present invention.But in order to realize desired effects with the additive of scheduled volume in known applications, a large amount of water components is required, when using apparatus of the present invention, then this is optional.The water component of flocculant liquid can be reduced, to make correspondingly to save the expense relevant to water content in very large degree.When required water is fewer, need the water of pumping fewer, then need the water of purifying fewer.
Can when not declaring explanation and being correct, the effect of the improvement that description below is realized by the present invention: the filler pulp particle of the given shape of the hybrid blade of apparatus of the present invention shredded pulp to a great extent, and the block of the fragmentation of gained forms unlimited crack.The given shape of flocculant outlet guarantees that flocculant liquid adopts the shape of large shaded surface (veil), and it covers the crack just opened wide and strengthens to make the mixing of filler and flocculant.Make will not be diluted in large water gaging further by additive with the state blending of meticulous distribution according to flocculant liquid of the present invention, that is, the water component of flocculant liquid need not be increased.Therefore, according to specific effective and favourable embodiment of the present invention, flocculant liquid is used as mother liquor, and wherein additive mixes with water in one step.Preferably, eliminate the extra website for mixing with water further.
With reference now to Fig. 1 and 2, be presented at least one embodiment, this device can be installed on and carry in the tubes/conduits 1 of filler slurry, and filler slurry flows through tubes/conduits 1 in the direction of arrow 2.This device can be installed on slurry pipe 1 by means of the flange 3 extended, and comprises the junction chamber 4 protruded from flange 3.Dispensing head 6 extends to slurry pipe 1 from junction chamber 4, and is arranged by end opposite in room 4 and the driver 7 being formed as motor rotates.Flocculant fluid pipeline 8 opens wide to room 4, and check-valves 9 is arranged in pipeline 8.Dispensing head 6 forms exit slot 10 and carries blended sliver zonate frond (11).
Sleeve 14 support and connection pipe 15 in the shaft extension 12 extended from driver 7, and in the end wall of junction chamber 4, is provided with axial vane surface seal 16, and shaft extension 13 is extended by axial vane surface seal 16.Tube connector 15 has the import 17 of multiple prolongation, and flocculant is flowed into tube connector from junction chamber by import 17.Tube connector 15 is protruded to junction chamber 4 by the sliding bearing sleeve (plainbearingsleeve) 5 be arranged in flange 3, wherein the required part (integralpart) of a tubular dispense 6 formation pipeline 15.Dispensing head 6 with join with the Plane of rotation 18 that dotted line is specified.Each hybrid blade 11 forms curved edge 19, and slit 20 is limited in the relevant position of blade relative to the slurry pipe 1 of circular cross section by it.
Can understand foregoing better with reference to following examples, the following example presents to illustrate, is not intended to limit the scope of the invention.
Embodiment 1
1 (i) filler pre-treatment:
The blend of filler particles is obtained from paper mill.Blended filler is the mixture of 50%PCC and 50%100%GCC.With running water, this filler blends is diluted to 20% solids content.The filler blends that 200mL dilutes is put into the glass beaker of 500mL.At least 30 seconds were stirred before adding coagulant.Agitator is the top typed blender of EUROSTAR numeral, with the quaterfoil screw (being all the IKAWorks company purchased from Wilmington, North Carolina State) of R1342,50mm.After mixing in initial 30 seconds, under 800rpm stirs, slowly add accelerator solution.The accelerator solution used is 4690.Based on filler stem weight, the dosage of coagulant is 1kg/ ton.Continue at 800 rpm to stir until add all coagulant.Then mixing speed is increased to 1500rpm, stirs 1 minute.
The use of 1 (ii) filler:
Batching is prepared by pulverizing the dry cover plate of commercially available bleached hardwood (hardwooddrylap).The mixture of 50%PCC and 50%GCC is joined in the batching of pulp to obtain the different filer contents in the scraps of paper.With the nail (unit of length) section 61067 of 200ppm as retention agent.In order to carry out preliminary treatment evaluation, joined before in batching with nail (unit of length) section coagulant 4690 pretreated filler mixture at filler.In handmade paper preparation process, add the nail (unit of length) section 63700 of 3kg/ ton to improve scraps of paper wet web strength.We attempt by measure scraps of paper wet web strengths evaluate filler pre-treatment on 63700 the impact of compacting dewatering.By controlling identical stress level at 60 DEG C, handmade paper is pressed onto a certain solids content (50%), in water, wet sheet is made to rupture completely the required time under being recorded in the shearing force of 1000RPM, to compare scraps of paper wet web strength, think that wet web strength reflects compacting dehydration indirectly.Result shows that adding 63700 can significantly improve scraps of paper wet web strength.Under lower content of ashes, filler pre-treatment can improve scraps of paper wet web strength 20% further.For higher content of ashes, the performance of 63700 is even higher than 20%.
Embodiment 2
Run machine testing, wherein paper machine prepares GAB300 with the machine speed of 900 ms/min.There is provided composition, cellulose fibre is wherein 14%MXW; The waste paper of 3% coating; 17%SOW; 12% uncoated waste paper; 44%DIP and 10%ONP.Batching also comprises GCC.In process of the test, comprise 15/ ton of nail (unit of length) section compacting chemical conditioner (pressdewateringaid) 63700, retention agent, sizing agent and cationic starch all wet end additives keep constant.
1) enhancing of filler confining force:
2kg/ ton is increased to gradually from 0.5kg/ ton (based on filler) by 4690.Find along with 4690 to adding in loading pipe, online content of ashes raises gradually.Obviously, by filler pre-treatment, obtain the rising of 0.7 grey branch from 15.6% to 16.3%.In history, for the production of same rank, when not using nail (unit of length) section 63700, the DCS content of ashes of record is about 12%.Be to be noted that the increase of content of ashes is only facilitated by filler synusia (ply).So the increase of content of ashes should be about 1.4% in filler synusia, because filler synusia forms the half of end-product quantitative (basisweight).FPAR is elevated to 75% from 70%, and what final content of ashes this can be interpreted as and obtain remarkable enhancing.
2) reduction of vapour pressure
Also find the vapour pressure being reduced predryer by filler process.From the morning 10:30 to 2:00 in afternoon, vapour pressure is reduced to 2 bar gradually slowly from 2.15 bar.Even if the pressing pressure of the pressing pressure of the first pressing part and the second pressing part is reduced to 470 and 580 from 550 and 600 respectively, vapour pressure still only gets back to 2.05.
In process of the test, in filler pre-treatment after about 1 hour, content of ashes is elevated to 16.3% from about 15.6%, then on phase same level, keeps several hours.On the other hand, vapour pressure keeps declining several hours, until reduce compacting load.This seems to show that steam minimizing is not only the rising due to content of ashes.Further, in this test, the reduction of steam demand only derives from filler synusia, because 4690 have only used on this synusia, and should be less so raise by content of ashes the total steam minimizing caused separately.Therefore, the preliminary treatment of result fillers can strengthen 63700 as the performance of suppressing dehydrating agent (pressdewateringagent) or wet web strength auxiliary agent.
Those of ordinary skill in the art should be appreciated that, all preceding methods can also be used for the paper washer comprising other non-cellulose fiber material, comprise the paper washer of the mixture of cellulose family and non-cellulose fiber material and/or the fiber-like material of synthesis.
When not deviating from the principle and scope of the present invention defined in claims, can change the configuration of composition of the present invention described herein, operation and method.Although the present invention can be implemented with the form that many kinds are different, describe particularly preferred embodiment of the present invention herein in detail.The disclosure is the example of principle of the present invention and is not intended to make the present invention be limited to shown particular implementation.In addition, any of some or all that the present invention includes various embodiment described herein may combine.All patents mentioned Anywhere in the patent quoted in this application or any, the patent application of quoting or other material quoted, patent application and other quote material and be incorporated to accordingly by quoting entirety.In addition, the present invention also expects the embodiment getting rid of any a kind of, some or all of compositions, method, composition, parts or the other parts of quoting material.
More than be disclosed as illustrative instead of exhaustive.To those skilled in the art, this description will imply many changes and possibility.All these possibilities and change are included in the scope of these claims, and wherein term " comprises " and meaning " including, but are not limited to ".Those those skilled in the art can recognize other equivalent of detailed description of the invention described herein, and these equivalents are also encompassed in these claims.
Here complete of the present invention preferably and the description of Alternate embodiments.One skilled in the art will recognize that, other equivalent of detailed description of the invention described herein, these equivalents are covered by appended claims.
Claims (19)
1. comprise a papermaking process for filler, said method comprising the steps of:
There is provided the blend of filler particles, at least one draining additive or wet web strength additive or wet strength auxiliary agent, and cellulose fibre storing,
When lacking cellulose fibre storing with filler particles described in composition of matter process,
Described filler particles and described cellulose fibre storing are combined,
Combine described at least one wet strength auxiliary agent or wet web strength additive or draining additive treating, and
Paper washer is combined to form by described,
Wherein the described filler particles of at least 10% is winnofil, and the described filler particles of at least 10% is grinding calcium carbonate,
Described cellulose fibre storing comprises multiple cellulose fiber peacekeeping water, and described composition of matter improves the performance of wet strength auxiliary agent or wet web strength additive or draining additive described in described paper washer,
And, wherein utilize rotation mixing device that composition of matter described at least some is added to described filler, described device has dispensing head, it is rotated by driver, be arranged in the container of the slurry containing described filler particles, and join with Plane of rotation, and described dispensing head has distributed outlet along its girth around rotating shaft, described composition passes into described slurry and hybrid blade from described distributed outlet, it is characterized in that, described outlet is formed as opening, and described hybrid blade is formed as band, described band extends laterally to described Plane of rotation and has the length of at least half of the internal diameter of the pipe equaling described slurry,
And send described composition to described dispensing head, for by described composition blending to described filler slurry.
2. method according to claim 1, wherein said paper washer by removing some water to be formed from described combination.
3. method according to claim 1, wherein calcium carbonate described at least some is in being selected from by a kind of form in the following group formed: the pulpous state calcium carbonate of the calcium carbonate do not disperseed, dispersion, chalk and their any combination.
4. method according to claim 1, wherein at least partially described calcium carbonate in dispersion pulpous state calcium carbonate form, the pulpous state calcium carbonate of described dispersion comprise further be selected from following at least one: acrylic acid polymer dispersant, polyphosphate sodium dispersant, kaolin slurry and their any combination.
5. method according to claim 1, the blend of wherein said filler particles is the grinding calcium carbonate of 50% and the winnofil of 50%.
6. method according to claim 1, wherein said composition of matter is coagulant.
7. method according to claim 1, wherein said composition of matter is be selected from the coagulant by the following group formed: inorganic coagulant, organic coagulant, polycondensation coagulant and their any combination.
8. method according to claim 1, wherein said composition of matter be the scope of molecular weight 200 to 1,000, the coagulant between 000.
9. method according to claim 1, wherein said composition of matter is coagulant, described coagulant is selected from by the following group formed: alum, sodium aluminate, polyaluminium chloride, the aluminium base chloride of hydroxyl, hydroxy Al chloride, poly-polymeric aluminum chloride, Sulfated polyaluminium chloride, polysilicate sulfuric acid aluminium, ferric sulfate, iron chloride, epichlorohydrin-dimethylamine (EPI-DMA), the polymer that EPI-DMA ammonia is crosslinked, the polymer of dichloroethylene and ammonia, the polymer of dichloroethylene, the polymer of dimethylamine, the condensation polymer of multifunctional diethylentriamine, the condensation polymer of multifunctional tetren, the condensation polymer of multifunctional hexamethylene diamine, the condensation polymer of multifunctional dichloroethylene, melamine polymers, formaldehyde resin polymer, positively charged vinyl-addition polymer and their any combination.
10. method according to claim 1, wherein said composition of matter is AcAm/DADMAC copolymer.
11. methods according to claim 1, wherein said draining additive or wet web strength additive or wet strength auxiliary agent are be selected from the one by the following group formed: glyoxalated acrylamide/DADMAC copolymer, polyvinylamine, polyvinylamide, polydiene propyl group amine and their any combination.
12. methods according to claim 1, wherein draining additive or wet web strength additive or wet strength auxiliary agent are paper washer 0.3kg to 5kg strength additive per ton relative to the ratio of described paper washer solid portion.
13. methods according to claim 1, the wherein described composition of matter process of GCC particle described at least some.
14. methods according to claim 1, wherein said PCC particle all need not described composition of matter process.
15. methods according to claim 1, wherein said paper washer has solid portion, and the described filler particles in described paper washer forms the gross mass being greater than the described solid portion of the described paper washer of 50%.
16. methods according to claim 1, wherein said draining additive or wet web strength additive or wet strength auxiliary agent, carry identical charges with described composition of matter.
17. methods according to claim 1, the blend of wherein said filler particles comprises the one be selected from by the following group formed further: organic pigment, inorganic pigment, clay, talcum, titanium dioxide, aluminium hydroxide, barium sulfate, magnesium hydroxide and their any combination.
18. 1 kinds comprise the papermaking process using filler, said method comprising the steps of:
There is provided the blend of filler particles, at least one dry strength auxiliary agent, and cellulose fibre storing,
When lacking cellulose fibre storing with filler particles described in composition of matter process,
Described filler particles and described cellulose fibre storing are combined,
Combine described in the process of at least one dry strength auxiliary agent, and
Paper washer is combined to form by described,
The wherein pulpous state calcium carbonate form of described filler particles in dispersion of at least 10%,
Described cellulose fibre storing comprises multiple cellulose fiber peacekeeping water, and
Described composition of matter improves the performance of dry strength auxiliary agent described in described paper washer,
And, wherein utilize rotation mixing device that composition of matter described at least some is added to described filler, described device has dispensing head, it is rotated by driver, be arranged in the container of the slurry containing described filler particles, and join with Plane of rotation, and described dispensing head has distributed outlet along its girth around rotating shaft, described composition passes into described slurry and hybrid blade from distributed outlet, it is characterized in that, described outlet is formed as opening, and described hybrid blade is formed as band, described band extends laterally to described Plane of rotation and has the length of at least half of the internal diameter of the pipe equaling described slurry,
And send described composition to described dispensing head, for by described composition blending to described filler slurry.
19. 1 kinds increase draining additive or wet web strength additive or interactional method between wet strength auxiliary agent and the cellulose fibre being mixed with filler particles, said method comprising the steps of:
When lacking cellulose fibre storing with composition of matter pretreated filler particle,
Pretreated filler particles and cellulose fibre are combined, and
Combine described at least one draining additive or wet web strength additive or the process of wet strength auxiliary agent,
Wherein said filler particles is selected from by the following group formed: winnofil, grinding calcium carbonate and their any combination, and
Described composition of matter suppresses described draining additive or wet web strength additive or wet strength auxiliary agent to adhere to described filler particles,
And, wherein utilize rotation mixing device that composition of matter described at least some is added to described filler, described device has dispensing head, it is rotated by driver, be arranged in the container of the slurry containing described filler particles, and join with Plane of rotation, and described dispensing head has distributed outlet along its girth around rotating shaft, described composition passes into described slurry and hybrid blade from distributed outlet, it is characterized in that, described outlet is formed as opening, and described hybrid blade is formed as band, described band extends laterally to described Plane of rotation and has the length of at least half of the internal diameter of the pipe equaling described slurry,
And send described composition to described dispensing head, for by described composition blending to described filler slurry.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/919,167 US9487916B2 (en) | 2007-09-12 | 2013-06-17 | Method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in papermaking |
| US13/919,167 | 2013-06-17 | ||
| PCT/US2014/041573 WO2014204702A1 (en) | 2013-06-17 | 2014-06-09 | A method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet stregnth and enhancing filler retention in papermaking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105378179A true CN105378179A (en) | 2016-03-02 |
| CN105378179B CN105378179B (en) | 2018-05-25 |
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ID=52105116
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480031469.XA Active CN105378179B (en) | 2013-06-17 | 2014-06-09 | Dehydration efficiency is improved in papermaking, scraps of paper wet web strength is improved, improves scraps of paper wet strength and the method for reinforcing filler retentivity |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP3011107B1 (en) |
| JP (1) | JP6469099B2 (en) |
| KR (1) | KR102220315B1 (en) |
| CN (1) | CN105378179B (en) |
| CA (1) | CA2913789C (en) |
| ES (1) | ES2922931T3 (en) |
| MX (1) | MX2015017287A (en) |
| WO (1) | WO2014204702A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117904896A (en) * | 2024-03-19 | 2024-04-19 | 山东奥赛新材料有限公司 | Paper stock drainage enhancer and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019056050A (en) * | 2017-09-20 | 2019-04-11 | ソマール株式会社 | Cationic filler-treatment agent |
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- 2014-06-09 WO PCT/US2014/041573 patent/WO2014204702A1/en active Application Filing
- 2014-06-09 ES ES14814129T patent/ES2922931T3/en active Active
- 2014-06-09 CA CA2913789A patent/CA2913789C/en active Active
- 2014-06-09 KR KR1020167001416A patent/KR102220315B1/en active IP Right Grant
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Also Published As
| Publication number | Publication date |
|---|---|
| CA2913789C (en) | 2021-07-27 |
| EP3011107A1 (en) | 2016-04-27 |
| KR20160021851A (en) | 2016-02-26 |
| KR102220315B1 (en) | 2021-02-25 |
| JP6469099B2 (en) | 2019-02-13 |
| CA2913789A1 (en) | 2014-12-24 |
| ES2922931T3 (en) | 2022-09-21 |
| EP3011107A4 (en) | 2017-02-01 |
| MX2015017287A (en) | 2016-04-06 |
| CN105378179B (en) | 2018-05-25 |
| WO2014204702A1 (en) | 2014-12-24 |
| EP3011107B1 (en) | 2022-04-20 |
| JP2016524662A (en) | 2016-08-18 |
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