阅读说明：本技术 一种格拉辛原纸、其生产方法及生产系统 (Glasin base paper, and production method and production system thereof ) 是由 张成飞 张益安 邵珠明 颜利兵 于 2018-06-29 设计创作，主要内容包括：本发明涉及造纸技术领域,具体涉及一种格拉辛原纸、其生产方法及生产系统,其中,格拉辛原纸包括原纸层,所述原纸层由原纸浆料制得,所述原纸浆料包括如下重量份的原料：化学漂白木浆10-20份、DMOW浆72-78份、损纸浆8-12份、生物酶0.01-0.03份、pH调节剂1-5份、定着剂0.4-0.5份、絮凝剂0.02-0.04份和助留助滤剂0.2-0.35份,本发明通过以化学漂白木浆、DMOW浆和损纸浆为二次纤维原料,添加生物酶、pH调节剂、定着剂、絮凝剂和助留助滤剂等助剂,以利于除去浆料中的杂质,进而提高原纸层的强度、表面平滑度和稳定性,得到纸张收缩率低、强度高、匀度较好、性能稳定的格拉辛原纸。(The invention relates to the technical field of papermaking, and particularly relates to glassine base paper, a production method and a production system thereof, wherein the glassine base paper comprises a base paper layer, the base paper layer is prepared from base paper pulp, and the base paper pulp comprises the following raw materials in parts by weight: the chemical bleached wood pulp comprises, by weight, 10-20 parts of chemical bleached wood pulp, 72-78 parts of DMOW pulp, 8-12 parts of broken pulp, 0.01-0.03 part of bio-enzyme, 1-5 parts of pH regulator, 0.4-0.5 part of fixing agent, 0.02-0.04 part of flocculating agent and 0.2-0.35 part of retention and drainage aid.)

1. The glassine base paper is characterized by comprising a base paper layer, wherein the base paper layer is prepared from base paper pulp, and the base paper pulp comprises the following raw materials in parts by weight:

2. the glassine paper according to claim 1, wherein each portion of said chemically bleached wood pulp comprises the following components in weight percent:

LBKP pulp 22-28%

NBKP pulp 22-28%

The balance of BCTMP slurry;

each part of the DMOW slurry comprises the following components in percentage by weight:

cosmetic waste 37# 28-33%

18 to 22 percent of daily waste No. 3

The surplus of the white paper is used in the state.

3. The glassine paper according to claim 1, wherein: the biological enzyme is at least one of esterase, lipase, cutinase, hemicellulase, peroxidase, beta-glucose oxidase, laccase, pectinase, cellulase, pectate lyase, glucosidase and protease; the pH regulator is at least one of sodium hydroxide, calcium hydroxide and potassium hydroxide; the fixative is alum, polyaluminium chloride, polyamine, polyethyleneimine, fixative C7500, fixative JHL-8016 or fixative Neosize 977; the flocculant is polyacrylamide or polyoxyethylene; the retention and drainage aid is at least one of organic microparticles SP7200, silica sol and bentonite.

4. The glassine paper according to claim 1, wherein: and the raw paper layer is compounded with a waterproof layer.

5. A process for producing a glassine paper according to claim 1, comprising the steps of:

step A, waste paper pulp preparation: uniformly mixing 10-20 parts by weight of chemical bleached wood pulp, 72-78 parts by weight of DMOW pulp, 8-12 parts by weight of broke pulp and 0.01-0.03 part by weight of biological enzyme, and dropwise adding 1-5 parts by weight of pH regulator to adjust the pH value to 7.5-9.0 to prepare mixed pulp;

step B, deslagging and screening and retention and drainage assistance: b, deslagging the mixed slurry prepared in the step A, adding 0.4-0.5 part by weight of a fixative, adding 0.02-0.04 part by weight of a flocculant after pulp flushing, adding 0.2-0.35 part by weight of a retention and drainage aid after screening, and uniformly mixing to prepare raw paper slurry;

step C, paper making by a paper machine: b, dehydrating and squeezing the base paper pulp prepared in the step B to prepare wet paper;

step D, drying and sizing: c, sequentially carrying out pre-drying, sizing, post-drying and cooling treatment on the wet paper prepared in the step C to prepare a paper web;

step E, calendering and curling: and D, sequentially carrying out calendaring treatment, reeling treatment and paper cutting treatment on the paper web prepared in the step D, and packaging after the paper web is qualified through inspection to obtain the raw paper layer.

6. The method for producing glassine paper according to claim 4, wherein the method comprises the following steps: in the step C, the flow rate of the base paper pulp is 60000-80000L/min, and the mass concentration of the base paper pulp is 0.8-1.1%.

7. The method for producing glassine paper according to claim 4, wherein the method comprises the following steps: in the step E, the line pressure of the calendering treatment is 50-100 kN/m.

8. A production system of glassine paper according to claim 1, characterized in that: the production system comprises a mixed pulp tank, a paper machine pulp tank, a slag separator, a fan pump, a pressure screen, a pulp flow box, a paper forming system and a post-treatment system which are sequentially communicated, the production system further comprises a biological enzyme storage tank, a pH regulator storage tank, a fixing agent storage tank, a flocculating agent storage tank and a retention and filtration aid storage tank, the discharge port of the biological enzyme storage tank and the discharge port of the pH regulator storage tank are communicated with the feed inlet of the paper machine pulp tank, the discharge port of the fixing agent storage tank is communicated with the feed inlet of the fan pump, the discharge port of the flocculating agent storage tank is communicated with the feed inlet of the pressure screen, and the discharge port of the retention and filtration aid storage tank is communicated with the feed inlet of the pulp.

9. The glassine paper production system according to claim 7, wherein: the paper forming system comprises a wire clamping former and a squeezer which are sequentially communicated, and a feed inlet of the wire clamping former is communicated with a discharge outlet of the pulp flowing box.

10. The glassine paper production system according to claim 8, wherein: the post-treatment system comprises a first drying cylinder, a surface sizing machine, a second drying cylinder, a cold cylinder, a calender and a coiler which are sequentially communicated, and a feed port of the squeezer is communicated with a discharge port of the first drying cylinder.

Technical Field

The invention relates to the technical field of papermaking, in particular to glassine base paper, a production method and a production system thereof.

Background

The glassine paper is an industrial paper and is made into glassine paper through the processes of rewetting, supercalendering, silicon oil coating and the like. The glassine paper is compact and uniform, has good internal strength and transparency, and is a common material for manufacturing bar code labels, non-setting adhesives, adhesive tapes or adhesive industrial products. Glassine paper has certain high temperature resistant, dampproofing, functions such as grease proofing, generally is used for the packing of trades such as food, medicine, mainly used: high speed labeling special tapes, double sided tape substrate trademarks, laser anti-counterfeiting marks and other release applications.

In the current paper-making industry, raw pulp or pure wood pulp is mostly used for producing glassine paper used as the middle paper of the express surface paste, so that the raw material and the production cost are high, and the environment is not protected. The conventional regenerated fiber double-sided offset paper cannot replace glassine paper to be used as the express surface paster medium paper, the production process technology for producing the glassine paper by using secondary fibers as raw materials and applying the glassine paper to the express surface paster medium paper at home is still immature, and the glassine paper with low paper shrinkage, high strength, good uniformity and stable performance cannot be provided for a packaging and printing enterprise, so that the express surface paster medium paper product with low paper shrinkage, high strength, good uniformity and stable performance, which is required by the packaging and printing enterprise, mainly depends on raw pulp, pure wood pulp or imported products, and is not in accordance with the strategic planning of sustainable development.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the invention aims to provide the glassine base paper which is prepared by adding the auxiliary agent into the secondary fiber and has the advantages of low paper shrinkage, high strength, good evenness and stable performance.

The second purpose of the invention is to provide a production method of glassine base paper, which has the advantages of simple steps, convenient operation and control, stable quality, high production efficiency, low production cost and large-scale industrial production, and the glassine base paper prepared by the method has low paper shrinkage, high strength, good uniformity and stable performance.

The invention also aims to provide a production system of glassine paper.

One of the purposes of the invention is realized by the following technical scheme: the glassine base paper comprises a base paper layer, wherein the base paper layer is prepared from base paper pulp, and the base paper pulp comprises the following raw materials in parts by weight:

according to the invention, the chemically bleached wood pulp, the DMOW pulp and the damaged pulp are used as secondary fiber raw materials, and auxiliary agents such as biological enzyme, pH regulator, fixing agent, flocculating agent, retention and drainage aid and the like are added, so that impurities in the pulp can be removed, and the strength, surface smoothness and stability of the raw paper layer are improved. Wherein, the DMOW pulp is mixed office waste paper deinking pulp, and the damaged pulp is paper re-making dry and wet waste pulp; the biological enzyme directly cuts off hydrogen bond combination inside the colloidal molecules of the adhesive through chemical reaction with the colloidal molecules of the adhesive, so that the adhesive loses viscosity, and the viscosity of the adhesive in the mixed slurry can be reduced along with the discharge of the slurry from a system; the pH regulator is an alkaline regulator, and is used for regulating the pH value of the mixed slurry and promoting the biological enzyme to degrade the adhesive in the mixed slurry; the fixing agent has the characteristics of strong cation property and low molecular weight, is combined with the action of anionic garbage and the filler in the mixed slurry, and neutralizes the negative charges on the surfaces of soluble organic matters and fine fibers with high charge density, thereby balancing the charges of the mixed slurry, reducing the interference of anionic impurities, and promoting the retention of the filler, the fine fibers and the chemical additives of the mixed slurry; the flocculant can be mixed with the mixed slurry to form compact flocs, the compact flocs are dispersed into small flocs through shearing, and the small flocs are mixed with the retention and drainage aid and then flocculated into controllable, uniform and open micro flocs, so that good retention and drainage performance is obtained, and the retention rate of the fine fibers and the fillers of the paper is greatly improved.

Preferably, each part of the chemically bleached wood pulp comprises the following components in percentage by weight:

the chemical bleaching wood pulp adopts the mixture of LBKP pulp, NBKP pulp and BCTMP pulp, compared with the wood pulp adopted by the traditional secondary fiber double-sided offset paper, the quality of the chemical bleaching wood pulp is far higher than that of the wood pulp adopted by the traditional secondary fiber double-sided offset paper, the product quality of the glassine paper is improved, and the strength, the evenness and the flatness of the paper are favorably improved. The DMOW pulp adopts the mixture of American waste 37#, daily waste 3# and national waste office white paper, compared with wood pulp adopted by the traditional secondary fiber double-offset paper, the raw material dosage of the American waste 37# and the daily waste 3# used by the invention is far higher than that of the American waste 37# and the daily waste 3# adopted by the traditional secondary fiber double-offset paper, the product quality of the glassine paper is improved, and the shrinkage, the flatness and the smoothness of the paper are favorably improved. The LBKP pulp is sulfate chemical bleaching long fiber wood pulp, the NBKP pulp is sulfate chemical bleaching short fiber wood pulp, and the BCTMP pulp is chemical bleaching thermomechanical wood pulp.

Preferably, the biological enzyme is at least one of esterase, lipase, cutinase, hemicellulase, peroxidase, beta-glucose oxidase, laccase, pectinase, cellulase, pectate lyase, glucosidase and protease; the pH regulator is at least one of sodium hydroxide, calcium hydroxide and potassium hydroxide; the fixative is alum, polyaluminium chloride, polyamine, polyethyleneimine, fixative C7500, fixative JHL-8016 or fixative Neosize 977; the flocculant is polyacrylamide or polyoxyethylene; the retention and drainage aid is at least one of organic microparticles SP7200, silica sol and bentonite.

More preferably, the biological enzyme is composed of esterase, pectinase, cellulase and cutinase in a weight ratio of 1.5: 1: 0.5-0.8: 0.2-0.5 of a mixture; the pH regulator is calcium hydroxide, the price of the calcium hydroxide is lower than that of sodium hydroxide, the coagulation effect is better than that of the sodium hydroxide, and meanwhile, the whiteness of the mixed slurry can be improved; the fixing agent is polyaluminium chloride, can neutralize anions in the mixed slurry, and simultaneously can play a role in quick chemical reaction, quickly and stably ensures the PCD value and the conductivity of the mixed slurry to be in a certain range, and avoids the retention and drainage-aid operation from being interfered by unstable factors of the PCD value and the conductivity; the flocculant is polyacrylamide, and the retention and drainage aid is prepared from organic microparticles SP7200 and bentonite in a weight ratio of 1: 10-12, the mixture is mixed with small floccules to re-flocculate into controllable, uniform and open micro floccules by utilizing the matching action of the bipolar bentonite and the organic microparticle SP7200, the compatibility is good, and the use of a sizing agent can be reduced.

Preferably, the raw paper layer is compounded with a waterproof layer, so that the waterproof effect of the glassine raw paper is improved.

More preferably, the waterproof layer comprises the following raw materials in parts by weight:

the invention takes organosilicon modified acrylic resin as a main component, polar oxygen atoms of the organosilicon modified acrylic resin are in hydrogen bond association with fibers of paper, so that a waterproof layer is compounded on a raw paper layer, nonpolar organic hydrocarbon groups of the organosilicon modified acrylic resin are far away from the raw paper layer, the hydrophobicity of the nonpolar organic hydrocarbon groups is strong, the waterproof effect is achieved, the surface activity of the organosilicon modified acrylic resin is high, the organosilicon modified acrylic resin is easy to spread on the liquid surface, the local surface tension on foam is unbalanced, the foam is broken to achieve the defoaming effect, and active hydroxyl groups in the organosilicon modified acrylic resin are easy to crosslink and solidify with other active groups. Latex, polyamide polyurea resin and poly butylene succinate are used as auxiliary components, and by utilizing the hydrophobicity of the latex, after moisture in the latex is evaporated, active groups of the latex react with hydroxyl groups or carboxyl groups of fibers to form hydrogen bonds or covalent bonds for tight connection, so that the adhesive force of the waterproof layer on the raw paper layer is further improved, a hydrophobic latex film is formed on the surface of the raw paper layer, the contact angle of the raw paper layer and water is increased, and the water resistance is improved; the polyamide polyurea resin can improve the evenness, the surface strength and the water-resistant hydrophobicity of paper sheets, accelerates the solidification of a waterproof layer, contains active groups such as active hydroxyl, chloroethanol group, polyamine group and the like, can be fully crosslinked and solidified with organic silicon modified acrylic resin, latex and poly butylene succinate, and further improves the water-resistant performance of the waterproof layer; the poly (butylene succinate) is synthesized by condensation polymerization of succinic acid and butanediol, is milk white, odorless and tasteless, has very stable performance in normal storage and use processes, can be decomposed by microorganisms and enzymes in animals and plants in the environments of compost, soil, water, activated sludge and the like, has good biocompatibility and bioabsorbability, good heat resistance, the heat deformation temperature and the product use temperature can exceed 100 ℃, has high hydrophobicity, and improves the water resistance of a waterproof layer. Under the action of a cross-linking agent, the organic silicon modified acrylic resin, the latex, the polyamide polyurea resin and the poly butylene succinate are subjected to cross-linking copolymerization, and due to the degradable performance of the poly butylene succinate, the glassine base paper containing the poly butylene succinate can decompose a cross-linked and copolymerized waterproof layer by using microorganisms and enzymes in the waste paper recovery process, so that the separation effect of fibers and the raw material of the waterproof layer in the waste paper recovery process is improved, and the fiber recovery utilization rate is improved; the thickening agent can control and adjust the rheological property, the dispersibility, the stability and the like of the waterproof layer; the dispersing agent is added during crosslinking, so that the aggregation of solid or liquid particles in a dispersion system can be reduced, and excessive polymerization during crosslinking copolymerization of organic silicon modified acrylic resin, latex, polyamide polyurea resin and poly (butylene succinate) is avoided; the antioxidant prevents the yellowing of the waterproof layer caused by oxidation from affecting the quality of the glassine base paper.

Preferably, the latex is at least one of butyronitrile latex, butylbenzene latex and carboxyl chlorobutadiene latex; the cross-linking agent is at least one of hydrogen peroxide, sodium peroxide, ammonium persulfate, aluminum sulfate and ammonium chloride; the thickener is at least one of polyvinyl alcohol, gelatin, methylcellulose, carboxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose; the dispersant is DC-40 or PA-40; the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant DLTP, antioxidant DSTP, antioxidant 1024 and antioxidant 225.

More preferably, the latex is butyronitrile latex, butylbenzene latex and carboxyl neoprene latex in a weight ratio of 1-3: 1.2-2.5: 0.5-1.0; the cross-linking agent is sodium peroxide, aluminum sulfate and ammonium chloride, and the weight ratio is 5-10: 1-2: 0.1-2.0; the thickening agent is polyvinyl alcohol, gelatin and carboxymethyl cellulose, and the weight ratio is 2-3.5: 1-2: 0.1-1.0; the antioxidant is an antioxidant 1010, an antioxidant 168, an antioxidant DLTP and an antioxidant 1024, and the weight ratio of the antioxidant to the antioxidant is 1.5-2: 0.5-0.8: 0.1-0.5: 0.4-0.6, antioxidant 1010, antioxidant 168, antioxidant DLTP and antioxidant 1024 are used together to play a synergistic effect, thereby improving the antioxidant performance.

The manufacturing method of the waterproof layer comprises the following steps:

(1) crushing 5-10 parts by weight of poly (butylene succinate), and sieving with a sieve of 300-400 meshes;

(2) mixing 5-10 parts of polybutylene succinate crushed in the step (1) with 30-40 parts of organic silicon modified acrylic resin, 20-30 parts of latex, 10-15 parts of polyamide polyurea resin and 0.5-1 part of dispersing agent by weight, and uniformly stirring at the temperature of 50-90 ℃ to obtain a mixed solution;

(3) dropwise adding 1-2 parts by weight of cross-linking agent into the mixed solution obtained in the step (2), stirring for 2-3h, then adding 0.1-0.3 part of thickening agent and 1-2 parts of antioxidant, and continuously stirring for 1-2h to obtain the waterproof coating;

(4) and (4) coating the waterproof coating prepared in the step (3) on the surface of the raw paper layer, and drying to obtain the waterproof layer.

The manufacturing method of the waterproof layer has the advantages of simple steps, convenience in operation and control, stable quality, high production efficiency and low production cost, and can be used for large-scale industrial production.

Wherein, the poly (butylene succinate) in the step (1) is sieved by a sieve of 300-400 meshes, so as to screen out the poly (butylene succinate) with proper particle size, which is convenient for dispersion crosslinking in the waterproof coating;

the second purpose of the invention is realized by the following technical scheme: a production method of glassine base paper comprises the following steps:

step A, waste paper pulp preparation: uniformly mixing 10-20 parts by weight of chemical bleached wood pulp, 72-78 parts by weight of DMOW pulp, 8-12 parts by weight of broke pulp and 0.01-0.03 part by weight of biological enzyme, and dropwise adding 1-5 parts by weight of pH regulator to adjust the pH value to 7.5-9.0 to prepare mixed pulp;

step B, deslagging and screening and retention and drainage assistance: b, deslagging the mixed slurry prepared in the step A, adding 0.4-0.5 part by weight of a fixative, adding 0.02-0.04 part by weight of a flocculant after pulp flushing, adding 0.2-0.35 part by weight of a retention and drainage aid after screening, and uniformly mixing to prepare raw paper slurry;

step C, paper making by a paper machine: b, dehydrating and squeezing the base paper pulp prepared in the step B to prepare wet paper;

step D, drying and sizing: c, sequentially carrying out pre-drying, sizing, post-drying and cooling treatment on the wet paper prepared in the step C to prepare a paper web;

step E, calendering and curling: and D, sequentially carrying out calendaring treatment, reeling treatment and paper cutting treatment on the paper web prepared in the step D, and packaging after the paper web is qualified through inspection to obtain the raw paper layer.

In the step B, the deslagging treatment is to remove larger heavy impurities such as glass slag, staples and the like in the mixed slurry, and then further remove various light and heavy impurities, so that the product quality is improved, and conditions are created for subsequent screening treatment; the screening process is on the one hand to remove dust and impurities from the mixed stock and on the other hand to uniformly disperse the mixed stock, resulting in a uniformly dispersed fibre suspension.

In the step C, the dryness of the obtained wet paper reaches 52-55 percent after the base paper pulp is dehydrated and squeezed for forming; in the dewatering process, the pulp mesh speed difference of the mesh part of the paper machine is controlled to be less than or equal to 65m/min, if the pulp mesh speed difference is larger, the longitudinal arrangement and the transverse arrangement of fibers on the base paper pulp are more, and the obtained glassine paper has poor folding resistance and poor evenness and can not meet the requirements of the glassine paper; the press forming operation adopts shoe press to carry out dewatering forming, which is beneficial to improving the dewatering efficiency of paper sheets and is more beneficial to the solidification of paper sheets, so that the paper sheets obtain better strength before drying, thereby obtaining better running performance in the press treatment, reducing the water content in the paper sheets, leading the dryness of the obtained wet paper to reach 52-55 percent and saving a large amount of heat energy and the retention time of the paper sheets for the subsequent drying step.

In the step D, the drying temperature of the pre-drying treatment and the drying temperature of the post-drying treatment are both 80-105 ℃, and the treatment time of the pre-drying treatment and the treatment time of the post-drying treatment are both 1.5-2.5 s; the dryness of the paper obtained by the pre-drying treatment reaches 93-95%, the dryness of the paper can be reduced by 1-3% when the sizing agent contains a small amount of water, the dryness of the paper obtained by the post-drying treatment reaches 92-94%, a large amount of heat energy and paper web retention time are saved, and the production efficiency is greatly improved; the treatment temperature of the temperature reduction treatment is 55-75 ℃, the treatment time is 0.1-0.2s, on one hand, the temperature of the paper web is reduced, on the other hand, water condensed on a cold cylinder by external air is used for improving the water content of the paper web by 1-3 percent, the plasticity of the paper web is increased, and convenience is provided for subsequent calendering; the sizing treatment mode is membrane transfer sizing, so that a layer of lyophobic membrane is formed on the surface of the paper web, the penetration and diffusion of liquid to fibers are prevented or delayed, and the paper or the paperboard has liquid penetration and diffusion resistance.

And step E, performing hard calendering treatment to obtain the smoothness of the raw paper layer reaching 63-67S.

Preferably, in the step C, the flow rate of the base paper slurry is 60000-.

The flow control of the base paper pulp is 60000-.

Preferably, in the step E, the line pressure of the calendering treatment is 50-100 kN/m.

The linear pressure of the hard calender is 50-100kN/m, so that the smoothness of the glassine paper reaches 63-67S, and the evenness index of the front side and the back side of the glassine paper reaches 9.5-9.9.

The third purpose of the invention is realized by the following technical scheme: the production system of the glassine base paper comprises a mixed pulp tank, a paper machine pulp tank, a slag separator, a fan pump, a pressure screen, a pulp flow box, a paper forming system and a post-treatment system which are sequentially communicated, the production system further comprises a biological enzyme storage tank, a pH regulator storage tank, a fixing agent storage tank, a flocculating agent storage tank and a retention and filter aid storage tank, the discharge port of the biological enzyme storage tank and the discharge port of the pH regulator storage tank are communicated with the feed port of the paper machine pulp tank, the discharge port of the fixing agent storage tank is communicated with the feed port of the fan pump, the discharge port of the flocculating agent storage tank is communicated with the feed port of the pressure screen, and the discharge port of the retention and filter aid storage tank is communicated with the feed port of the pulp flow box.

The invention controls the liquid level of the paper machine pulp chest by adjusting the total flow of the pulp from the mixed pulp chest; feeding the biological enzyme in the biological enzyme storage tank and the pH regulator in the pH regulator storage tank into the paper machine pulp tank to promote the biological enzyme to degrade stickies in the mixed pulp; the slag remover comprises a plurality of conical slag removers, and in the slag removers, heavy impurities such as glass slag, staples and the like with larger mixed slurry are removed firstly, and then various light and heavy impurities are further removed, so that the product quality is improved, and conditions are created for the subsequent work of the pressure screen; the pressure screen removes dust and impurities in the mixed slurry on one hand, and uniformly disperses the mixed slurry on the other hand to form uniformly dispersed fiber suspension; sending the fixative in the fixative storage tank into the fan pump for slurry flushing treatment, and quickly and stably mixing the PCD value and the conductivity of the slurry; feeding the flocculating agent in the flocculating agent storage tank into the pressure screen, mixing the flocculating agent and the mixed slurry to form compact flocs, and dispersing the compact flocs into small flocs after the compact flocs pass through the high shearing force of the pressure screen; and (3) conveying the retention and drainage aid in the retention and drainage aid storage tank into the head box, mixing the small floccules with the retention and drainage aid, and flocculating again to form controllable, uniform and open micro floccules, so that good retention and drainage performance is obtained, and the retention rate of paper fine fibers and fillers is greatly improved.

Preferably, the paper forming system comprises a wire clamping former and a squeezer which are communicated in sequence, and a feed inlet of the wire clamping former is communicated with a discharge outlet of the head box.

More preferably, the net clamping former comprises a surface net and a bottom net, the surface net is formed by weaving surface warps and surface wefts in a staggered mode, and the bottom net is formed by weaving bottom warps and bottom wefts in a staggered mode; the diameter of the surface warp is 0.15-0.19mm, and the diameter of the bottom warp is 0.15-0.19 mm; the diameter of the surface weft is 0.25-0.29mm, and the diameter of the bottom weft is 0.25-0.29mm, so that the dewatering distance of the surface net and the bottom net is ensured, the retention rate of paper fine fibers and fillers is improved, and the surface smoothness of the paper is improved.

Preferably, the post-treatment system comprises a first drying cylinder, a surface sizing machine, a second drying cylinder, a cold cylinder, a calender and a coiler which are sequentially communicated, and a feed inlet of the squeezer is communicated with a discharge outlet of the first drying cylinder.

The wet paper is sequentially subjected to pre-drying treatment by a first drying cylinder, sizing treatment by a surface sizing machine, post-drying treatment by a second drying cylinder, cooling treatment by a cold cylinder, calendaring treatment by a calendaring machine and reeling by a reeling machine, so that the smoothness of the paper is improved. More preferably, the surface sizing machine is a film transfer sizing machine, and the calender is a hard calender.

The invention has the beneficial effects that: according to the glassine base paper, chemically bleached wood pulp, DMOW pulp and damaged paper pulp are used as secondary fiber raw materials, and auxiliary agents such as biological enzyme, pH regulator, fixing agent, flocculating agent, retention and drainage aid and the like are added, so that impurities in the pulp can be removed, the strength, surface smoothness and stability of the base paper layer are improved, and the glassine base paper with low paper shrinkage rate, high strength, good uniformity and stable performance is obtained.

The production method of the glassine base paper has the advantages of simple steps, convenient operation and control, stable quality, high production efficiency and low production cost, and can be used for large-scale industrial production.

According to the production system of the glassine base paper, the total flow of the mixed pulp from the pulp tank is adjusted to control the liquid level of the pulp tank of the paper machine; feeding the biological enzyme in the biological enzyme storage tank and the pH regulator in the pH regulator storage tank into the paper machine pulp tank to promote the biological enzyme to degrade stickies in the mixed pulp; the slag remover comprises a plurality of conical slag removers, and in the slag removers, heavy impurities such as glass slag, staples and the like with larger mixed slurry are removed firstly, and then various light and heavy impurities are further removed, so that the product quality is improved, and conditions are created for the subsequent work of the pressure screen; the pressure screen removes dust and impurities in the mixed slurry on one hand, and uniformly disperses the mixed slurry on the other hand to form uniformly dispersed fiber suspension; sending the fixative in the fixative storage tank into the fan pump for slurry flushing treatment, and quickly and stably mixing the PCD value and the conductivity of the slurry; feeding the flocculating agent in the flocculating agent storage tank into the pressure screen, mixing the flocculating agent and the mixed slurry to form compact flocs, and dispersing the compact flocs into small flocs after the compact flocs pass through the high shearing force of the pressure screen; and (3) conveying the retention and drainage aid in the retention and drainage aid storage tank into the head box, mixing the small floccules with the retention and drainage aid, and flocculating again to form controllable, uniform and open micro floccules, so that good retention and drainage performance is obtained, and the retention rate of paper fine fibers and fillers is greatly improved.

Drawings

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a schematic diagram of a framework of the production system of the present invention.

The reference signs are: 01. a mixed slurry tank; 02. a paper machine stock chest; 03. a slag remover; 04. a fan pump; 05. a pressure screen; 06. a head box; 07. a mesh clamping former; 08. a press; 09. a first dryer; 10. a surface sizing machine; 11. a second dryer; 12. cooling the cylinder; 13. a calender; 14. a coiler; 15. a biological enzyme storage tank; 16. a pH regulator storage tank; 17. a fixative reservoir; 18. a flocculant storage tank; 19. and a retention and drainage aid storage tank.

Detailed Description

For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and accompanying fig. 1-2, which are not intended to limit the present invention.