CN109252415B - A kind of kraft paperboard and its manufacturing method - Google Patents
A kind of kraft paperboard and its manufacturing method Download PDFInfo
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- CN109252415B CN109252415B CN201811201200.8A CN201811201200A CN109252415B CN 109252415 B CN109252415 B CN 109252415B CN 201811201200 A CN201811201200 A CN 201811201200A CN 109252415 B CN109252415 B CN 109252415B
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
- D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
-
- 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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/10—Phosphorus-containing compounds
-
- 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
-
- 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
- D21H17/42—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups anionic
-
- 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
-
- 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
-
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/50—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
- D21H21/54—Additives of definite length or shape being spherical, e.g. microcapsules, beads
Abstract
The invention belongs to pulp technology for making paper, and in particular to a kind of kraft paperboard and its manufacturing method.The kraft paperboard includes surface layer, sandwich layer, bottom；Surface layer, sandwich layer, bottom raw material in contain GCC slurry；GCC slurry includes water, GCC, in the polyacrylamide derivative with phenyl ring branch of tridimensional network, anionic polyacrylamide.Cladding processing is carried out to GCC using polyacrylamide based polyalcohol, the partial size of GCC is increased, improves the compatibility with organic pulping system, increases GCC to the fixation rate of paper pulp.The manufacturing method of a kind of kraft paperboard paper machine and the kraft paperboard is also protected simultaneously, and the kraft paperboard mechanical strength with higher and whiteness that paper machine and preparation method through the invention obtains, whiteness will not reduce excessively after long-time service；And the paper-making process is green and pollution-free, production cost is low.
Description
Technical field
The present invention relates to pulp technology for making paper, and in particular to a kind of kraft paperboard and its manufacturing method.
Background technique
Currently, kraft paperboard in the market, because its product has the characteristics that intensity is high, color is good, print gloss is high,
The deep welcome by customers.These kraft paperboards can be fabricated to packing case, for containing various electric appliances, daily necessities, industry
Articles etc., high-intensitive performance characteristics can avoid containing the mechanical damage of article, high color and good print gloss energy
Assign the better appearance of packing case.
Since kraft paperboard is relatively high to surface brightness index request, but extensive utilization chemical industry bleaching liquor is bleached in industry
Slurry, or pulp brightness is improved using bleached wood pulp, it can be only achieved properties of product requirement.Wherein chemical industry bleaching liquor chemical industry is at high cost,
And operational hazards；Bleached wood pulp is at high cost.Therefore, current kraft paperboard production technology had both endangered the body of workshop operator
Body health, and the cost of product is increased, while also polluted environment, it can no longer meet current actual demand.
Chinese invention patent (CN106835798, a kind of high-strength kraft inner paper method for bleaching) discloses a kind of using to ox
The method that pick up paper is bleached, the alkaline thiourea dioxide water solution being configured to using sodium hydroxide and thiourea dioxide is to ox
Pick up paper pulp carries out bleaching, is pre-processed, is passed through to slurry using ethylenediamine tetra-acetic acid and viscosity protective agent before bleaching
The reproducibility of thiourea dioxide selectively destroys the chromophoric group in paper pulp to slurry bleaching, does not remove wood moulding in slurry, protects
Bleaching effect has been demonstrate,proved, the loss of paper pulp effective component is avoided.But the process employs a large amount of chemical reagent to paper pulp into
Row bleaching, such as sodium hydroxide, thiourea dioxide of strong reducing property of strong basicity etc., all have the personal safety of operator
Biggish harmfulness, and if these chemical reagents deal with and will cause environmental pollution improperly, bleaching processes are complicated, mention
High production cost.
Chinese invention patent (CN106894268, a kind of high-strength cow boxboard and preparation method thereof) discloses one kind
Kraft paperboard with higher-strength, including surface layer, sandwich layer and bottom, the starch adhesive raw material of surface layer include: bleached wood pulp 20-70
Part, 30-80 parts of true qualities carpenter, 30-70 parts of staple fiber secondary stock；Sandwich layer and bottom raw material include: 50-100 parts of imported waste paper, state
Interior waste paper 0-50 parts.This method has carried out bleaching to the starch adhesive raw material of surface layer and has improved, and replaces true qualities wood using bleached wood pulp part
Slurry, and using the staple fiber wood pulp after bleached wood pulp, true qualities wood pulp and part dirt count as raw material of fabric, improve raw material
Whiteness, and then improve the brightness of product.But this method only improves the paper pulp raw material of surface layer, and the paper of sandwich layer and bottom
Slurry does not carry out bleaching, only improves the brightness of surface layer, and the brightness of sandwich layer and bottom is not improved, causes paperboard bright
Degree is uneven；Bleached wood pulp has been used simultaneously, has introduced chemical industry bleaching liquor, there is corrosivity, endanger operator's health, it is dirty
Environment is contaminated, and bleached wood pulp belongs to the product after processing, it is at high cost, improve being produced into for finally obtained kraft paperboard
This.
In order to improve the pollution situation of chemical industry bleaching agent, inorganic filler can be added in the paper making process.Chinese invention patent
(CN102363932, a kind of method that the online surface of papermaking filler is modified) discloses the method that a kind of pair of filler is modified, and fills out
Expect that calcium carbonate, talcum powder, kaolin or titanium dioxide may be selected, prepares the water slurry of filler, certain density modification first
Gelatinized corn starch liquid and retention agent (cationic polyacrylamide, anionic polyacrylamide, modification or non-modified carboxymethyl cellulose
Element) aqueous solution above-mentioned three kinds of component on-line mixings are evenly distributed in paper making pulp pipeline using jet mixing device,
Modified starch paste liquid and retention agent together form the modifying agent of filler, coat to filler, have obtained " filler-modification shallow lake
The Trinitarian micro- flocculation structure of powder-retention agent ", increases the retention rate and paper quality of filler, and significantly reduce and be produced into
This.(coating modification-raising of Liu Wenxia, Zhang Fengshan papermaking filler is filled with strength character [J] China of paper to Chinese periodical
Paper industry, 2010,31 (24): 6-11) in record: starch, cellulose, chitosan solution can be prepared, filler-calcium carbonate is wrapped
Processing is covered, filler retention and the binding force with fiber are improved.Chinese invention patent (CN107675556, a kind of papermaking filler
Scene coats poly- method of modifying of wadding a quilt with cotton in advance) a kind of methods of three layers of cladding processing filler are disclosed, the coating outside filler is followed successively by
Polyelectrolyte A, polyelectrolyte B, polyelectrolyte C, wherein polyelectrolyte A is identical as the charge characteristic of filler, and the charge with B, C
Characteristic is on the contrary, and at least one is starch, cellulose, guar gum or chitosans in polyelectrolyte A, B, C.But starch, fibre
The whiteness of dimension element, chitosan and guar gum is lower, wraps up filler, can reduce the whiteness of paper, and when multilayer is wrapped up, whiteness reduces ground
It becomes apparent from；And starch, cellulose or chitosan are all not soluble in water, can be only formed the suspension of water, may when coating filler
It leads to the problem of that package is non-uniform, causes the uneven of paper performance and whiteness, reduce product quality；While coating starch,
Guar gum has certain viscosity, the adhesion be easy to causeing between paper, and product is not easy to arrange and pack.
Chinese invention patent (CN106320064, the production method of paper grade (stock) filler) discloses at a kind of pair of filler
The method of reason coats filler-calcium carbonate, then the cation with high molecular weight with the cationic polyacrylamide of low molecular weight first
Polyacrylamide cladding, forms the package of approximate double-layer structure, then is spray-dried, and obtains pulverulent filler, can reduce carbon
The turnover rate of sour calcium.Although this method does not need to introduce the coatings such as starch, needs are in advance handled filler, then
For in paper production line, filler experienced the process of " water dispersion-drying-again water dispersion ", and linear polyacrylamide is readily soluble
Yu Shui is added that treated in paper production line dry filler will lead to the loss of a part of polyacrylamide；Meanwhile the hair
The cationic polyacrylamide of bright selection is linear structure, is only relied between different strands when being coated on around filler point
Active force or Hydrogenbond between son, are also easy to fall off；To influence the covered effect to filler, the retention of filler also drops significantly
It is low.
Summary of the invention
What the present invention to be solved be inorganic filler in kraft paperboard in the prior art retention it is lower, the gloss of paper
Spend the higher technical problem of not high and manufacturing cost.
In order to solve the above-mentioned technical problem, the invention discloses a kind of kraft paperboard, the quantification of 80- of kraft paperboard
250g/m2；It from top to bottom successively include surface layer, sandwich layer, bottom；The surface layer, sandwich layer, bottom raw material in containing paper pulp and
GCC slurry；Wherein in GCC slurry include GCC, water, in tridimensional network the polyacrylamide derivative with phenyl ring branch,
Anionic polyacrylamide.Wherein, GCC can be liquid GCC, usually the GCC aqueous dispersions of high concentration；It is also possible to powder
The dimensions of GCC, GCC particle is 40-70 grades, and preferably 60-65 grades, i.e., granule number of the size less than 2um reaches in GCC particle
To 40%-70%, preferably 60%-65%.It, can be in the polyacrylamide derivative with phenyl ring branch of tridimensional network
It is a kind of polyacrylamide derivative reacted by aldehyde compound, phenolic compound with polyacrylamide, wherein aldehydes
Compound includes formaldehyde, glyoxal, glutaraldehyde etc., and phenolic compound includes phenol, polyhydroxy methyl resorcinol etc., phenols chemical combination
The phenyl ring of object can be introduced into the branch of polyacrylamide；It is also possible to the compound such as phenolic aldehyde tree by having benzene ring structure
Rouge, polystyrene etc., directly react with polyacrylamide and are made.
Further, in order to increase the dispersibility of GCC in water, it is also added into dispersing agent in GCC slurry, dispersing agent is usual
Selected from organic dispersing agent, such as triethyl group hexyl phosphoric acid, hydroxymethyl cellulose, hydroxyethyl cellulose, polyacrylamide, polypropylene
Sour sodium, the copolymer of acrylic acid, maleic anhydride modified Sodium Polyacrylate etc., the purpose is to increase the dispersibility of GCC in water,
Form stable slurry；Paper pulp itself belongs to organic system simultaneously, and organic dispersing agent can increase the compatible of GCC slurry and paper pulp
Property, it is ensured that the appearance and performance of final kraft paperboard product are more uniform.
The GCC slurry the preparation method comprises the following steps: GCC is added to the water, dispersing agent can be added when necessary, stir evenly to be formed
The aqueous dispersions of GCC；Then to the polyacrylamide with phenyl ring branch being added in the aqueous dispersions of GCC in tridimensional network
Derivative stirs evenly, and polyacrylamide derivative forms micro-sphere structure in conjunction with GCC, obtains dispersion liquid I；Add anion
Polyacrylamide stirs evenly, and anionic polyacrylamide is coated on micro-sphere structure surface, increases the partial size of GCC, must disperse
Liquid II, as GCC slurry, the preparation process of GCC slurry is to temperature and pressure no requirement (NR).Wherein, anionic polyacrylamide
Relative molecular weight is greater than the polyacrylamide derivative with phenyl ring branch in tridimensional network: in the band of tridimensional network
The polyacrylamide derivative of phenyl ring branch is middle low molecular weight, equal relative molecular weight≤4,000,000 of number, anionic polyacrylamide
For the anionic polymer of linear high molecular weight, unbranched structure, equal relative molecular weight≤7,000,000 of number.
After GCC is dispersed in water, there are anionic trashes in aqueous dispersions, they come from negatively charged substance, including
Negative electrical charge etc. in dispersing agent, dilution water, the polyacrylamide derivative with branched structure can neutralize above-mentioned anionic trash,
Microspheroidal structure can be formed in conjunction with GCC again simultaneously, and the polyacrylamide derivative with phenyl ring branched structure has
Three-dimensional net structure can be wrapped in GCC particle surface securely, reduce the analysis migration of GCC；Add linear high molecular weight
Anionic polyacrylamide, relative molecular weight is much larger than to spread out in the polyacrylamide with phenyl ring branch of tridimensional network
Biology, biggish molecular weight mean there is longer macromolecular chain, can be coated on the microspheric surface GCC, so just exist
GCC has wrapped up on surface one layer of high molecular polymer, and two layers of coating on the surface GCC be polyacrylamide base height it is poly-
A possibility that object, the combination between coating is also closer, further reduced GCC migration precipitation；It is all organic polymer
Coating can be all polymer pulping system it is preferably compatible, keep system more uniform；The partial size of GCC also increases simultaneously
Big, the forming net of paper grade (stock) has a certain size hole, usually 60-100 mesh, and the partial size of GCC is smaller, and GCC more holds
It is easily lost in white-water system with a large amount of water by forming net, increases partial size, just reduced GCC and pass through molding mesh stream
The probability of mistake increases GCC in the retention on paper pulp surface, therefore GCC is also just not easily to fall off in use process.
The present invention also protects a kind of for manufacturing the paper machine of kraft paperboard simultaneously, is disposed in the horizontal direction
Head box, wet end, press section, front baking cadre, size press portion, rear drying portion, hard calender, reel machine.
The wet end is designed as three folded nets；The press section is designed as twice shoe press, or big roller diameter and one together
The cooperation squeezing of road shoe；The front baking cadre arranges drying cylinder using single linked network arrangement drying cylinder or double linked networks；The size press
Portion uses membrane type resin application methods, resin added 3-7g/m2；Drying portion is using single linked network arrangement drying or double linked networks after described
Arrange drying cylinder；The hard press polish line pressure is 20-120KN/M, and temperature is 100-200 DEG C.
Be in place of the difference of this paper machine and conventional paper machine: the head box of conventional paper machine is open type or air cushion
Formula head box, head box pressure head is low, and speed is slow；And the press section of a paper machine dewatering type of conventional paper machine is de- for press with large-roll-diameter
Water.The paper machine paper machine slurry flowing box that the present invention protects is flowing full formula head box, can meet higher speed requirement；Press section of a paper machine
Dewatering type is shoe press, and pressed zone field width, dehydration is more, improves wet web into the mass dryness fraction of drying section, significantly reduces
The dosage of drying section steam reduces energy consumption, convenient for improving speed.
The present invention also protects a kind of manufacturing method of kraft paperboard simultaneously, includes the following steps:
(1) slurry is made after size degradation, screening and purification, heat partition and defibrination process in the wastepaper as raw material that buying comes, point
It is assigned to the slurry pool of surface layer, sandwich layer and bottom；
(2) it by GCC pulp dilution, distributes to the slurry pool of surface layer, sandwich layer and bottom；
(3) mixed pulp of GCC slurry is added by being sufficiently mixed, screening, the good slurry filtered out is sent to the stream of paper machine
Starch case；
(4) mixed pulp of the addition GCC slurry of head box internal surface layer, sandwich layer and bottom passes through wet end, press section respectively
Dehydration forming, front baking cadre drying and the sizing of size press portion, the drying of rear drying portion, hard calender press polish, reel machine curling and
After cutting bundling, that is, product is made.
Wherein, the mass fraction of GCC is 40%-80% in original GCC slurry, and the quality of GCC is divided in GCC slurry after dilution
Number is 10%-40%.
Further, the GCC content distributed to the surface layer, sandwich layer, base pastes is respectively as follows: 3-15 kg/ton of surface layer
Paper；0.01-15 kg/ton of paper of sandwich layer；0.01-15 kg/ton of paper of bottom.
Manufacture kraft paperboard during, to GCC use with tridimensional network polyacrylamide derivative and
The step of anionic polyacrylamide is handled, there are three optional opportunitys: first, it is carried out before the feed of GCC slurry；The
Two, it is added on the mixer on GCC pipeline；Third carries out in the dilution of GCC slurry.
GCC is added in kraft paperboard in the present invention during manufacturing, and handles GCC, by close using high charge
Degree, middle low molecular weight and the polyacrylamide derivative pretreatment with branched structure in tridimensional network, neutralize in GCC
Anionic trash；And after in conjunction with GCC forming micro-sphere structure, the anionic polyacrylamide of linear high molecular weight is added,
Microspheric calcium carbonate is subjected to fixation, increases the partial size of GCC, to increase the retention of GCC, simultaneously as GCC is carried out
Polymer wrapped increases with the binding force of fiber, not easily to fall off, ensure that final kraft paperboard obtained persistently keeps high
Glossiness.The good feature of GCC covering is taken full advantage of, to body paper whiteness, faces the poor ox of sophistication, paper impurity situation directly
Leather trunk paperboard carries out GCC coating, and the same available kraft paperboard for meeting product standard has not only saved cost of material,
Bleaching process is also avoided, environmental pollution is reduced.
The present invention compared with the existing technology, has the advantages that
(1) low to original paper quality requirement, it the full secondary stock recycling slurry of wastepaper as raw material can be used to be produced, environmental protection and cost
It is low.
(2) GCC is handled using polymer, the binding force and GCC for increasing GCC and paper pulp fiber are on paper pulp surface
Retention, overcome currently can only with bleaching medicament or whitewood starch improve starch adhesive brightness technical problem.
(3) traditional paper machine is improved, uses flowing full formula head box instead, higher speed requirement can be met；Using shoe
Squeezing, reduces energy consumption, convenient for improving speed, improves production efficiency.
(4) ingredient is carried out according to certain GCC wet end furnish to paperboard surface layer, sandwich layer, bottom in the paper making process, rationally
GCC slurry is distributed, ensure that the high brightness of paperboard.
Detailed description of the invention:
Fig. 1: the manufacturing process schematic diagram of kraft paperboard.
Specific embodiment:
With reference to the accompanying drawing, specific embodiments of the present invention are described in detail.
As shown in Figure 1, being the manufacturing process schematic diagram of kraft paperboard, GCC slurry uses water after the processing of polymer
It is diluted to corresponding solid content, is stored in spare in GCC diluting tank；It is further uniformly mixed, leads to by being pumped into mixer
It is respectively allocated to surface layer, sandwich layer and bottom machine chest by overcurrent meter, regulating valve according to a certain percentage；Liquefy GCC slurry with
The paper pulp of each layer after mixing, is diluted and is uniformly mixed by pumping to introduce the slurry into rush in stock tank respectively；Then respectively
It is screened into paper machine screen, good slurry enters each layer head box；Slurry into each layer head box then passes through the three of paper machine
Folded wet end, splenium dehydration forming, front baking cadre drying and top sizing, rear drying portion drying, press polish, curling and cutting bundling,
Kraft paperboard product finally can be obtained.
The quantification of 200g/m of final kraft paperboard obtained is set in following embodiment and comparative example2Left and right.
Embodiment 1
It liquefies in the preparation of GCC slurry, powder GCC that preferred dimension specification is 60 grades, dispersing agent are triethyl group hexyl phosphorus
Acid, the polyacrylamide derivative with phenyl ring branch in tridimensional network are that polyacrylamide and phenolic resin react production
Object, the equal relative molecular weight of number is 2,500,000, the equal relative molecular weight of the number of anionic polyacrylamide is 9,000,000.
Paper machine for manufacturing kraft paperboard is disposed with head box, wet end, press section, front baking in the horizontal direction
Cadre, size press portion, rear drying portion, hard calender, reel machine；The wet end is designed as three folded nets；The head box is full
Streaming head box, the press section are designed as twice shoe press, or big roller diameter shoe cooperation squeezing with together with together；It is described
Front baking cadre arranges drying cylinder using single linked network arrangement drying cylinder or double linked networks；The size press portion uses membrane type resin application methods,
Resin added is 3-7g/m2；Drying portion arranges drying cylinder using single linked network arrangement drying or double linked networks after described；The hard press polish
Line pressure is 20-120KN/M, and temperature is 100-200 DEG C.
The manufacturing process of kraft paperboard are as follows:
(1) GCC, dispersing agent are added to the water first, obtain the aqueous dispersions of GCC after mixing evenly；Add dispersing agent
Triethyl group hexyl phosphoric acid is dispersed with stirring uniformly；The polyacrylamide derivative with phenyl ring branch in tridimensional network is added,
It stirs evenly, polyacrylamide derivative forms micro-sphere structure in conjunction with GCC, obtains dispersion liquid I；Add anion pp acyl
Amine stirs evenly, and anionic polyacrylamide is coated on micro-sphere structure surface, increases the partial size of GCC, obtains dispersion liquid II；?
It is spare to liquefaction GCC slurry.Wherein, each raw material mass mixture ratio: GCC is 100 parts, dispersing agent triethyl group hexyl phosphoric acid is 1 part,
Water is 150 parts, is 2 parts, anionic polyacrylamide in the polyacrylamide derivative with phenyl ring branch of tridimensional network
It is 4 parts.
(2) wastepaper as raw material for carrying out buying, size degradation, screening and purification, heat partition and defibrination process through paper pulp workshop, system
At slurry, it is sent to paper machine slurry tower.
(3) the liquefaction GCC pulp dilution for obtaining (1) step to GCC mass fraction is 30%, will by paper machine room
Liquefaction GCC slurry after dilution is respectively allocated to the mixing pit of surface layer, sandwich layer and bottom, wherein the quality proportioning of each layer raw material
Are as follows: surface layer: 3.33 parts of GCC slurry after 100 parts of paper pulp, dilution；Sandwich layer: 0.67 part of GCC slurry after 100 parts of paper pulp, dilution；
Bottom: 0.67 part of GCC slurry after 100 parts of slurry, dilution.At this point, the content of GCC is about 10 kg/ton of paper, sandwich layers in surface layer
2 kg/ton of paper are each about with the content of GCC in bottom to be sent to after mixing and destroy forebay.
(4) copying forebay underflow and being overshooted stock tank to be diluted to concentration is 1.2%, after by Lip river, cloth mixer is sufficiently mixed, paper
Machine sieve is further after screening, and good slurry is sent to paper machine slurry flowing box, and slurry is sent to two sections of sieve screening and removing impurities of paper machine.
(5) with slurry, through feeding system, paper pulp is transported to paper machine slurry flowing box, is dehydrated by three folded net wet ends, press section
Type, front baking cadre drying and size press portion top sizing, rear drying portion drying, hard calender press polish, reel machine crimp and divide
Cutting volume, that is, be made product.It is denoted as S1.
Embodiment 2
The preparation method of the paper machine and kraft paperboard selected in the embodiment is same as Example 1, and difference is only
Be: in the preparation of GCC slurry, the GCC mass fraction that preferred dimension specification is 60 grades is 90%GCC aqueous dispersions.It is final to produce
Product are denoted as S2.GCC aqueous dispersions are selected to prepare liquefaction GCC slurry, each raw material dosage need to be calculated by the actual mass of GCC.
Embodiment 3
The preparation method of the paper machine and kraft paperboard selected in the embodiment is same as Example 1, and difference is only
Be: in the preparation of GCC slurry, preferred dimension specification is 40 grades of powder GCC.Final products are denoted as S3.
Comparative example 1
The selection of paper machine and the manufacturing process of kraft paperboard are same as Example 1 in the comparative example, difference
Place is only that the treatment process to GCC slurry: only derivative with the polyacrylamide with phenyl ring branch with tridimensional network
Object carries out cladding processing to GCC slurry.Final products are denoted as B1.
Comparative example 2
The selection of paper machine and the manufacturing process of kraft paperboard are same as Example 1 in the comparative example, difference
Place is only that the treatment process to GCC slurry: only carrying out cladding processing to GCC slurry with anionic polyacrylamide.It is final to produce
Product are denoted as B2.
Comparative example 3
The selection of paper machine and the manufacturing process of kraft paperboard are same as Example 1 in the comparative example, difference
Place is only that the treatment process to GCC slurry: GCC slurry does not have to the polyacrylamide with phenyl ring branch with tridimensional network
Amine derivative and anionic polyacrylamide processing, only carry out decentralized processing with dispersing agent.Final products are denoted as B3.
Boxboard paper product S1-S3, B1-B3 obtained in embodiment 1-3 and comparative example 1-3 are tested for the property: reference
Standard GB/T/T13024-2016 " boxboard " tests its quantitative, burst index, folding strength (transverse direction)；Referring to GB standard
GB/T7974-2013 " measurement (diffusion/normal beam technique, the outdoor daylight item of paper, cardboard and paper pulp blue light diffusing reflection factor D65 brightness
Part) " test the boxboard use same day and using the surface layer whiteness after 60 days.Test result is as follows shown in table 1:
The performance test results of table 1 product S1-S3 and B1-B3
As can be seen from Table 1, the present invention is using kraft paperboard obtained after the processing of GCC slurry, compared with comparative example,
Burst index with higher and folding strength, i.e. high mechanical strength；And whiteness is also higher, and with the increase for using the time,
Whiteness will not be decreased obviously.
The GCC slurry of comparative example 1, GCC particle is only with the middle low molecular weight with phenyl ring branch with tridimensional network
Polyacrylamide derivative carries out cladding processing, and the partial size of GCC does not further increase, can be a large amount of when by forming mesh
It is lost and enters in white-water system, the retention of GCC is relatively low, therefore the mechanical strength of B1 and whiteness are all not so good as the production in embodiment
Product.
GCC slurry in comparative example 2, GCC particle only carry out cladding processing with the anionic polyacrylamide of high molecular weight,
Anionic trash in GCC is not neutralized, and is directly handled with the anionic polyacrylamide of linear structure, cladding effect
Fruit is poor, can not form micro-sphere structure, and a large amount of GCC particle is directly contacted with paper pulp, the GCC and organic fibre as inorganic material
Tieing up plain paper pulp cannot preferably combine, while the partial size of GCC does not significantly increase, by that can be flowed by mesh when molding mesh
It loses, therefore the retention of GCC is lower, the performance of mechanical strength and whiteness to kraft paperboard improves very limited.
The unused polymer of GCC slurry of comparative example 3 carries out cladding processing, is only dispersed with dispersing agent, GCC particle table
Face is not coated by high polymer, and inorganic GCC particle is directly contacted with organic pulping system, poor compatibility, while the partial size of GCC
Have no increase, by paper machine molding mesh when can be largely lost, the retention of GCC is low, can not achieve to leather boxes
The raising of the mechanical strength and whiteness of paperboard.
Simultaneously as comparative example 1-3 is not effectively coated and handled to GCC particle, kraft paperboard makes in the later period
Migration precipitation can occur with GCC in the process, cause the whiteness of product to decline more.
The kraft paperboard comprehensive performance that embodiment 1 obtains is optimal, is most preferred embodiment.Embodiment 1 and 3 has been all made of powder
Body GCC, the difference is that the GCC grain sized specification in embodiment 1 is 60 grades, the GCC grain sized specification in embodiment 3
It is 40 grades, i.e., the GCC particle size in embodiment 3 is than big in embodiment 1.Biggish GCC particle may result in polypropylene
The backbone of amide and polyacrylamide derivative cannot be coated on particle surface completely, and covered effect is poor, while particle ruler
It is very little it is larger so that the connection effect between particle is deteriorated, cannot more effectively realize the enhancing of product；Biggish particle size
Also reflection and refraction of the product to different wavelengths of light be will affect, and then influence the whiteness of product, whiteness is caused to reduce.Embodiment 2
It is raw material with scattered high concentration liquid GCC slurry in advance, and the particle size of GCC is same as Example 1, properties of product
No significant difference illustrates that either powder GCC slurry still shifts to an earlier date scattered GCC slurry, carries out at high polymer cladding it
It is similar to the performance boost effect of kraft paperboard after reason.
Meanwhile the GCC Stability of Slurry by high polymer cladding processing is good, for product after use in 60 days, whiteness is equal
Without being decreased obviously, illustrate that GCC particle has been firmly bonded in pulping system.
Therefore, it can be seen that from the performance test results of embodiment and comparative example when kraft paperboard produces in paper pulp
GCC, which is added, can be improved the mechanical strength of kraft paperboard, to polypropylene with phenyl ring branch of the GCC with tridimensional network
Amide derivatives and the processing of linear anionic polyacrylamide, the synergistic effect of the two can significantly improve the retention of GCC, assign
The higher mechanical strength of kraft paperboard and whiteness, while the chemical stability of GCC is good, it will not be because of the long-term of kraft paperboard
Using and turn to be yellow, it is ensured that product has lasting high whiteness.
The foregoing is merely presently preferred embodiments of the present invention, is not limited to invent, all in design concept of the invention
Within, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of kraft paperboard, including surface layer, sandwich layer, bottom, it is characterised in that:
The surface layer, sandwich layer, bottom raw material in contain GCC slurry；
In the GCC slurry include GCC, water, in tridimensional network the polyacrylamide derivative with phenyl ring branch, yin from
Sub- polyacrylamide；
Number equal relative molecular weight≤4,000,000 of the polyacrylamide derivative with phenyl ring branch in tridimensional network；
The number of the anionic polyacrylamide equal relative molecular weight≤7,000,000；
It further include dispersing agent in the GCC slurry；The dispersing agent is organic dispersing agent triethyl group hexyl phosphoric acid；
The polyacrylamide derivative with phenyl ring branch in tridimensional network is phenolic compound or has phenyl ring knot
The compound of structure is reacted with polyacrylamide to be made, and the phenolic compound is phenol or polyhydroxy methyl resorcinol；The band
The compound for having benzene ring structure is phenolic resin or polystyrene；
The GCC slurry the preparation method comprises the following steps: GCC is added to the water, stir evenly the aqueous dispersions to form GCC；Then to GCC
Aqueous dispersions in be added be in tridimensional network the polyacrylamide derivative with phenyl ring branch, stir evenly, must disperse
Liquid I；Anionic polyacrylamide is added in dispersion liquid I, stirs evenly, obtains dispersion liquid II, as GCC slurry；
The quality proportioning of each raw material is 100 parts of GCC, 1 part of dispersing agent triethyl group hexyl phosphoric acid in the slurry, and water is 150 parts,
In 2 parts of polyacrylamide derivative with phenyl ring branch of tridimensional network, 4 parts of anionic polyacrylamide.
2. kraft paperboard as described in claim 1, it is characterised in that: the dimensions of the GCC is 40-70 grades.
3. a kind of method for manufacturing kraft paperboard as claimed in claim 1 or 2, which comprises the steps of:
(1) slurry, distribution to surface layer, sandwich layer after wastepaper as raw material size degradation, screening and purification, heat partition and defibrination process, will be made
With the slurry pool of bottom；
(2) GCC slurry is distributed to the slurry pool of surface layer, sandwich layer and bottom；
(3) mixed pulp of GCC slurry is added by being sufficiently mixed, screening, the good slurry filtered out is sent to the head box of paper machine；
(4) mixed pulp of the addition GCC slurry of head box internal surface layer, sandwich layer and bottom passes through wet end, press section dehydration respectively
Molding, front baking cadre drying and the sizing of size press portion, rear drying portion drying, hard calender press polish, reel machine curling and cutting
After bundling, that is, product is made.
4. the method for manufacture kraft paperboard as claimed in claim 3, it is characterised in that: distribution to the surface layer, sandwich layer, bottom
The GCC content of layer slurry is respectively as follows: 3-15 kg/ton of paper of surface layer；0.01-15 kg/ton of paper of sandwich layer；Bottom 0.01-15 thousand
G ton paper.
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| CN111424460B (en) * | 2020-03-25 | 2022-12-20 | 山鹰国际控股股份公司 | Method for manufacturing regenerated two-layer cardboard paper by running three-layer net-folding paper machine |
| CN114561833A (en) * | 2022-02-28 | 2022-05-31 | 山东博汇纸业股份有限公司 | Production method of single-layer white pulp fine dried noodle white-surface kraft liner board |
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| CN101634120A (en) * | 2009-08-25 | 2010-01-27 | 陕西科技大学 | Method for improving performance of paper stock in retention and drainage aiding |
| WO2011047047A2 (en) * | 2009-10-13 | 2011-04-21 | The Penn State Research Foundation | Composites containing polypeptides attached to polysaccharides and molecules |
| CN103282582A (en) * | 2010-10-29 | 2013-09-04 | 巴科曼实验室国际公司 | Papermaking and products made thereby with ionic crosslinked polymeric microparticle |
| CN103981756A (en) * | 2014-05-22 | 2014-08-13 | 金东纸业（江苏）股份有限公司 | Method for processing papermaking mechanical pulp |
| CN106245409A (en) * | 2016-08-26 | 2016-12-21 | 江苏理文造纸有限公司 | A kind of method for manufacturing of environmental protection kraft liner cardboard paper |
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|---|---|---|---|---|
| CN101634120A (en) * | 2009-08-25 | 2010-01-27 | 陕西科技大学 | Method for improving performance of paper stock in retention and drainage aiding |
| WO2011047047A2 (en) * | 2009-10-13 | 2011-04-21 | The Penn State Research Foundation | Composites containing polypeptides attached to polysaccharides and molecules |
| CN103282582A (en) * | 2010-10-29 | 2013-09-04 | 巴科曼实验室国际公司 | Papermaking and products made thereby with ionic crosslinked polymeric microparticle |
| CN103981756A (en) * | 2014-05-22 | 2014-08-13 | 金东纸业（江苏）股份有限公司 | Method for processing papermaking mechanical pulp |
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