CN101565913A - Method for producing corrugated paper with ultralow gram weight and high strength - Google Patents
Method for producing corrugated paper with ultralow gram weight and high strength Download PDFInfo
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- CN101565913A CN101565913A CNA2009100393480A CN200910039348A CN101565913A CN 101565913 A CN101565913 A CN 101565913A CN A2009100393480 A CNA2009100393480 A CN A2009100393480A CN 200910039348 A CN200910039348 A CN 200910039348A CN 101565913 A CN101565913 A CN 101565913A
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Abstract
The invention discloses a method for producing corrugated paper with ultralow gram weight and high strength. The method comprises the following technological steps: 1) mixing; 2) addition of water for size degradation to prepare pulp; 3) pulp combination and purification treatment; 4) medium-concentration pulping; 5) addition of a chemical medicine system into the pulp; 6) twin-wire forming, water filtration and paper-making with the pulp; 7) three-stage squeezing dehydration; 8) prebaking and drying; 9) double-faced sizing; 10) postbaking and drying; and 11) coiling. The method utilizes pulping and paper-making process combination and completely utilizes secondary fiber to make the corrugated paper with ultralow gram weight and high strength so as to reduce the gram weight of the corrugated paper, save the fiber amount, reduce the production cost, and simultaneously reduce the energy consumption and the discharge capacity and improve the economic benefit.
Description
Technical field
The present invention relates to a kind of production method of corrugated paper with ultralow gram weight and high strength, belong to the manufacturing technology field of fluting medium in the paper industry.
Background technology
Corrugated paper is a kind of common package paper, is the important component part of wrapping paper.In recent years, domestic medium-to-high grade paperboard production increases rapidly, and consumption has belonged to rarely greater than the kind of output, and high-strength corrugated base paper is the most outstanding a kind of, and the market demand is very big.From the present domestic condition of production, fluting medium generally is to be joined by common mixed paper waste reclaiming or a small amount of other slurry of interpolation to copy production.Along with the waste paper cycle-index constantly increases, very big variation has taken place in fibre length and fibre property, and this can have a strong impact on product quality, makes the of low grade of the fluting medium produced, intensity difference.For a long time, the method that improves paper strength improves quantitatively exactly.This just means that when raw material was identical, the quantitatively low and high strength of fluting medium was a pair of contradiction.
Existing is the production of fluting base paper line of raw material with waste paper, divides three kinds according to the production scale size is main, and its technology and characteristics are also different.
Traditional technological process is: waste paperboard, hydrabrusher size degradation, the desanding of sand setting ditch, screen centrifuge desanding, thickener concentrate, 450 double plates mill is pulled an oar, hang down dense desander desanding, selectifier screens, paper machine is manufactured paper with pulp, rewinding machine is cut, finished product.The characteristics of this flow process are: 1, production scale is little, investment is little; 2, backward in technique; 3, product quality is of low grade, can not use on the above corrugated paper production line of 100m/min; 4, sewage effluent pollutional load height.
Medium scale waste paper is that the production of fluting base paper line of raw material is: waste paperboard, continous mode pulper size degradation, high concentration desanding device desanding, defibrator screening, heat dispersion machine remove that light impurity, pressurized screen screening, low dense desander desanding, thickener concentrate, double plate or cone mill making beating, pressurized screen screening, paper machine are manufactured paper with pulp, rewinding machine is cut, finished product.The characteristics of this flow process are: 1. production capacity is big, can reach 5～60,000 tons/year; 2. technology is advanced; 3. product quality can reach the GB13023-91B level, can adapt to the 180m/min corrugated paper production line.But this flow process is handled not thorough to the viscose glue thing in the waste paper, hot-melt object, making beating is stronger to the cut-out of waste paper fibre, the further raising of product physical quality index need realize that the product appearance quality index is difficult to further raising by increasing more import long fiber wastepaper as raw material proportioning.
Large-scale waste paper is that the production of fluting base paper line of raw material is: waste paperboard, pulper size degradation, high concentration desanding device desanding, fractionating screen screening, heat dispersion machine remove that light impurity, pressurized screen screening, low dense desander desanding, thickener concentrate, double plate or cone mill making beating, pressurized screen screening, paper machine are manufactured paper with pulp, rewinding machine is cut, finished product.The characteristics of this flow process are: 1. production capacity is big, reaches more than 100,000 tons/year; 2. advanced technology is handled thoroughly light, the heavy seeds in the waste paper, sicker, and paper pulp fiber carries out classification, and staple fibre is not pulled an oar; 3. the interpolation papermaking chemical improves the product physical strength, reduces the waste discharge pollutional load; 4. product quality reaches the GB13023-91A level, and what reach import fully is the A level product physics and the quality index appearance of raw material with former wood pulp.But this flow process investment is big, does not fit into medium-scale production.
Summary of the invention
In order to overcome of low grade, the intensity difference of existing fluting medium, grammes per square metre is big, to the viscose glue thing in the waste paper, hot-melt object handle thoroughly, deficiency such as the flow process investment is big, the invention provides a kind of production method of corrugated paper with ultralow gram weight and high strength, this method is utilized a kind of papermaking combination, can utilize the secondary stock quantitative high-strength corrugated base paper of excess of export of manufacturing paper with pulp fully, thereby reduced fiber consumption, reduced cost, created economic benefit.
The technical solution adopted for the present invention to solve the technical problems is: this step is as follows:
1. batching: imported waste paper is mixed with domestic waste paper, and imported waste paper accounts for by weight percentage 40%～60% of total waste paper;
2. add the water size degradation and make slurry:, make the slurry of high concentration mixed waste paper size degradation in hydrabrusher;
3. the slurry combination purification is handled: slurry after first sand setting, scalping impurity elimination under the high concentration, is separated the long fiber in the slurry by classifying screen again with staple fibre, staple fibre is removed impurity by low dense scummer screening; Long fiber is through low dense scummer screening sand setting, pass through the fine screen decontamination again after, long fiber is sent into the dispersion that hot decentralized system carries out impurity such as sicker, hot-melt object;
4. medium consistency refining: will transfer to by weight percentage 4.5%～6% through the long stuff concentration after the overheated dispersion treatment, sending into mill then pulls an oar, beating degree is 30～40 ° of SR, when guaranteeing fibre length, abundant fuzz fiber, effectively improve fluting medium intensity, reduced energy consumption simultaneously, reduced blowdown flow rate;
5. add the chemicals system in slurry: add in through the slurry behind the medium consistency refining and mixed with slurry by four kinds of chemicals constitutional chemistry product systems, each component addition accounts for over dry slurry ratio by weight percentage and is respectively in this chemistry systems: alkyl ketene dimer 0.3～0.5%, aluminum sulfate 0.8～1.0%, bentonite 0.1～0.3%, high polymer 0.02～0.05%;
6. folder net forming drainage is manufactured paper with pulp: make slurry flow out on the forming net of circulation and distribute uniformly and interweave from head box;
7. three sections press dewaterings: the l Water Paper that wire side is removed is guided to between the pressure roller of felt, mat rolls the extrusion of rumble and the water sorption of felt, l Water Paper is done further dehydration, and make papery tightr, to improve paper, gain in strength, wherein three sections squeezings are four rollers, three nip types, wherein a pressure is the blind hole squeezing, and two pressures are suction press, and three pressures are shoe press;
8. preceding oven dry is dry: with the l Water Paper oven dry of heating of dehydration;
9. two-sided applying glue:, improve the water repelling property and the surface property of page with this all coat papermaking starch sizing agent commonly used through the dry paper two sides of preceding oven dry;
10. the back oven dry is dry: the paper that will scribble starch sizing agent is dried once more;
11. batch.
Corrugated paper with ultralow gram weight and high strength production technology of the present invention in the 1st step imported waste paper and domestic waste paper be in old newspaper (ONP), waste and old boxboard (OCC), waste and old magazine (OMG), the Mixed Office WasteMOW (MOW) one or more.
Described slurry is to utilize the batching in the step 1 to make, this slurry combined treatment be with slurry after first sand setting, scalping impurity elimination under the high concentration, by classifying screen the long fiber in the slurry is separated with staple fibre, staple fibre is removed impurity by low dense scummer screening again; Long fiber is through low dense scummer screening sand setting, pass through the fine screen decontamination again after, long fiber is sent into the dispersion of impurity such as the sicker of hot decentralized system in will preparing burden, hot-melt object.
Corrugated paper with ultralow gram weight and high strength production technology of the present invention high concentration and low concentration in the 3rd step is at the sand setting slurry, and the sand setting concentration that high concentration is meant slurry is by weight percentage 3%～5%; The sand setting concentration that low concentration is meant slurry is by weight percentage 1～1.5%; Low dense scummer screening is meant that the screening of forward low concentration removes heavy slag and reverse low concentration removes the mode sand setting that light slag combines; Fine screen is meant that mesh size is 0.2～0.25mm; Scalping is meant that mesh size is 2～2.5mm; Classifying screen is meant that mesh size is 0.2～0.3mm; Long fiber and staple fibre are those skilled in the art's the classification that is commonly called as, and staying above the classifying screen is long fiber, and by classifying screen is staple fibre.
Medium consistency refining in the 4th step is a beating consistency at the long stuff after overheated dispersion treatment, and its concentration is by weight percentage 4.5%～6%.
Production technology of the present invention chemistry systems in the 5th step is alkyl ketene dimer, aluminum sulfate, bentonite, high polymer and the mixture formed, wherein high polymer is a paper industry retention and drainage aid agent commonly used, as starch based, liquid polypropylene acid amides, solid polypropylene acid amides, common quaternary ammonium salts, double base retention, guar gum and ZYC type quaternary amine macromolecule paper retention and filter aid, be the one pack system chitosan quaternary ammonium salt.
It is to count speed with the car of 1450～1550m/min to manufacture paper with pulp on paper machine VOITH net clamping machine that the folder net forming drainage of production technology of the present invention in the 6th step manufactured paper with pulp.
The starch sizing agent of production technology of the present invention in the 9th step is paper industry starch sizing agent commonly used.
The present invention is to utilize a kind of papermaking combination about the production method of corrugated paper with ultralow gram weight and high strength, utilize secondary stock a kind of corrugated paper with ultralow gram weight and high strength of manufacturing paper with pulp out fully, thereby reduced the grammes per square metre of corrugation paper, saved fiber consumption, reduced production cost, reduce energy consumption simultaneously, reduced blowdown flow rate, improved economic benefit.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the inventive method process flow diagram.
The specific embodiment
The inventive method efficiently solves of low grade, the intensity difference of existing fluting medium, grammes per square metre is big, to the viscose glue thing in the waste paper, hot-melt object handle thoroughly, not enough problem such as the flow process investment is big, this invention concrete grammar is as follows: 1) batching; 2) add the water size degradation and make slurry; 3) the slurry combination purification is handled; 4) medium consistency refining; 5) in slurry, add the chemicals system; 6) folder net forming drainage is manufactured paper with pulp; 7) three sections press dewaterings; 8) preceding oven dry is dry; 9) two-sided applying glue; 10) the back oven dry is dry; 11) batch.
Corrugated paper with ultralow gram weight and high strength production technology of the present invention in the 1st step imported waste paper and domestic waste paper be in old newspaper (ONP), waste and old boxboard (OCC), waste and old magazine (OMG), the Mixed Office WasteMOW (MOW) one or more.
Described slurry is to utilize the batching in the step 1 to make, this slurry combined treatment be with slurry after first sand setting, scalping impurity elimination under the high concentration, by classifying screen the long fiber in the slurry is separated with staple fibre, staple fibre is removed impurity by low dense scummer screening again; Long fiber is through low dense scummer screening sand setting, pass through the fine screen decontamination again after, long fiber is sent into the dispersion of impurity such as the sicker of hot decentralized system in will preparing burden, hot-melt object.
The concentration that corrugated paper with ultralow gram weight and high strength production technology of the present invention high concentration in the 3rd step is meant the slurry sand setting is by weight percentage 3%～5%; The concentration that low concentration is meant the slurry sand setting is by weight percentage 1～1.5%; Low dense scummer screening sand setting is that the screening of forward low concentration removes heavy slag and reverse low concentration removes the mode sand setting that light slag combines; Fine screen is meant that mesh size is 0.2～0.25mm; Scalping is meant that mesh size is 2～2.5mm; Classifying screen is meant that mesh size is 0.2～0.3mm; Long fiber and staple fibre are those skilled in the art's the classification that is commonly called as, and staying above the classifying screen is long fiber, and by classifying screen is staple fibre;
Production technology of the present invention medium consistency refining in the 4th step is that the long stuff concentration after overheated dispersion treatment is transferred to by weight percentage 4.5%～6%, sending into mill then pulls an oar, beating degree is 30～40 ° of SR, when guaranteeing fibre length, abundant fuzz fiber, effectively improve fluting medium intensity, reduced energy consumption simultaneously, reduced blowdown flow rate.
Production technology of the present invention chemistry systems in the 5th step is alkyl ketene dimer, aluminum sulfate, bentonite, high polymer and the mixture formed, wherein high polymer is a paper industry retention and drainage aid agent commonly used, as starch based, liquid polypropylene acid amides, solid polypropylene acid amides, common quaternary ammonium salts, double base retention, guar gum and ZYC type quaternary amine macromolecule paper retention and filter aid, be the one pack system chitosan quaternary ammonium salt.
It is to count speed with the car of 1450～1550m/min to manufacture paper with pulp on paper machine VOITH net clamping machine that the folder net forming drainage of production technology of the present invention in the 6th step manufactured paper with pulp.
The starch sizing agent of production technology of the present invention in the 9th step is paper industry starch sizing agent commonly used.
Below it will be appreciated by those skilled in the art that, illustrate with regard to embodiment.
Embodiment
1. batching: import OCC is mixed with domestic OCC, and import OCC accounts for by weight percentage 40% of total OCC;
2. add the water size degradation and make slurry:, make the slurry of high concentration mixed waste paper size degradation in hydrabrusher;
3. the slurry combination purification is handled: after the first sand setting of the slurry of high concentration, scalping impurity elimination, by classifying screen the long fiber in the slurry is separated with staple fibre, staple fibre is removed impurity by low dense screening again; Long fiber is through low dense screening sand setting, pass through the fine screen decontamination again after, long fiber is sent into the dispersion that hot decentralized system carries out impurity such as sicker, hot-melt object.
4. medium consistency refining: will transfer to by weight percentage 5% through the long stuff concentration after the overheated dispersion treatment, and send into mill then and pull an oar, beating degree is 30 ° of SR, when guaranteeing fibre length, and abundant fuzz fiber;
5. add the chemicals system in slurry: add in through the slurry behind the medium consistency refining and mixed with slurry by four kinds of chemicals constitutional chemistry product systems, each component addition accounts for total slurry butt ratio by weight percentage and is respectively in this chemistry systems: alkyl ketene dimer 0.4%, aluminum sulfate 0.9%, bentonite 0.2%, high polymer 0.02%;
6. folder net forming drainage is manufactured paper with pulp: make slurry flow out on the forming net of circulation and distribute uniformly and interweave from head box, manufacture paper with pulp with the speed of a motor vehicle of 1450m/min on paper machine VOITH twin wire paper machine;
7. three sections press dewaterings: the l Water Paper that wire side is removed is guided to between the pressure roller of felt, mat rolls the extrusion of rumble and the water sorption of felt, l Water Paper is done further dehydration, and make papery tightr, to improve paper, gain in strength, wherein three sections squeezings are four rollers, three nip types, wherein a pressure is the blind hole squeezing, and two pressures are suction press, and three pressures are shoe press;
8. preceding oven dry is dry: with the l Water Paper oven dry of heating of dehydration;
9. two-sided applying glue:, improve the water repelling property and the surface property of page with this all coat papermaking starch sizing agent commonly used through the dry paper two sides of preceding oven dry;
10. the back oven dry is dry: the paper that will scribble adhesive is dried once more;
11. batch.
Gained fluting medium character is as follows: quantitative 65g/m
2, thickness 0.117mm, tightness 0.59g/cm
2, moisture 6.5%, fracture length 6.8km, ring crush index 6.5Nm/g, concora crush intensity is 92.5N.
Claims (9)
1. method for producing corrugated paper with ultralow gram weight and high strength, this method processing step is: 1) batching; 2) add the water size degradation and make slurry; 3) the slurry combination purification is handled; 4) medium consistency refining; 5) in slurry, add the chemicals system; 6) folder net forming drainage is manufactured paper with pulp; 7) three sections press dewaterings; 8) preceding oven dry is dry; 9) two-sided applying glue; 10) the back oven dry is dry; 11) batch.
2. method for producing corrugated paper with ultralow gram weight and high strength according to claim 1 is characterized in that: described batching is that imported waste paper is mixed with domestic waste paper, and imported waste paper accounts for by weight percentage 40%～60% of total waste paper.
3. method for producing corrugated paper with ultralow gram weight and high strength according to claim 2, it is characterized in that: described slurry is to utilize the batching in the step 1 to make, this slurry combined treatment be with slurry after first sand setting, scalping impurity elimination under the high concentration, by classifying screen the long fiber in the slurry is separated with staple fibre, staple fibre is removed impurity by low dense scummer screening again; Long fiber screens first sand setting through low dense scummer, pass through the fine screen decontamination again after, long fiber is sent into the dispersion of impurity such as the sicker of hot decentralized system in will preparing burden, hot-melt object.
4. method for producing corrugated paper with ultralow gram weight and high strength according to claim 3 is characterized in that: described low dense scummer screening is that the screening of employing forward low concentration removes heavy slag and reverse low concentration removes the mode sand setting that light slag combines.
5. method for producing corrugated paper with ultralow gram weight and high strength according to claim 3, it is characterized in that: described medium consistency refining is that the long stuff concentration after overheated dispersion treatment is transferred to 4.5%～6% middle concentration slurry by weight percentage, then this slurry is sent into mill and pull an oar, beating degree is 30～40 ° of SR.
6. method for producing corrugated paper with ultralow gram weight and high strength according to claim 5 is characterized in that: described chemistry systems is alkyl ketene dimer, aluminum sulfate, bentonite, high polymer and the mixture formed, and high polymer is the paper grade (stock) retention and drainage aid agent.
7. method for producing corrugated paper with ultralow gram weight and high strength according to claim 6 is characterized in that: each component addition of described chemistry systems accounts for over dry slurry ratio by weight percentage and is respectively: alkyl ketene dimer 0.3～0.5%, aluminum sulfate 0.8～1.0%, bentonite 0.1～0.3%, high polymer 0.02～0.05%.
8. method for producing corrugated paper with ultralow gram weight and high strength according to claim 6 is characterized in that: it is to count speed with the car of 1450～1550m/min to manufacture paper with pulp on paper machine VOITH net clamping machine that described folder net forming drainage is manufactured paper with pulp.
9. method for producing corrugated paper with ultralow gram weight and high strength according to claim 8 is characterized in that: described three sections press dewaterings are four rollers, three nip types, and wherein a pressure is the blind hole squeezing, and two pressures are suction press, and three pressures are shoe press.
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