CN112796147B - Clean production method of corrugated medium paper with zero sludge discharge in pulping process - Google Patents
Clean production method of corrugated medium paper with zero sludge discharge in pulping process Download PDFInfo
- Publication number
- CN112796147B CN112796147B CN202011563509.9A CN202011563509A CN112796147B CN 112796147 B CN112796147 B CN 112796147B CN 202011563509 A CN202011563509 A CN 202011563509A CN 112796147 B CN112796147 B CN 112796147B
- Authority
- CN
- China
- Prior art keywords
- sludge
- treatment
- pulp
- pulping
- paper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention discloses a clean production method of corrugated core paper with zero sludge discharge in a pulping process, which comprises conventional papermaking steps such as a pulping step, a high-concentration filter pressing step, a low-concentration filter pressing step, a flotation deinking step, a low-concentration desanding step, a precipitation step, a pulp mixing and pulp preparing step, a papermaking step, a squeezing step, a drying step and the like, and further comprises sludge treatment steps such as a sludge drying and disinfecting step, a material preparing step, a forming step and the like. In the production process of corrugated core paper and corrugated paper, sludge produced in the process of making paper by using waste paper does not need to be purified, and only the sludge dewatering step and the sludge drying and disinfecting step are needed, so that the environment-friendly and degradable clay-plastic composite supporting plate can be obtained by the steps of material preparation and forming, and the production process is clean and environment-friendly.
Description
Technical Field
The invention relates to the technical field of production methods for making paper by using waste paper, in particular to a clean production method of corrugated medium paper and corrugated paper with zero sludge emission in the pulping process.
Background
At present, all manufacturers of corrugated paper including corrugated medium paper use waste paper such as waste paper boxes and waste paper boards as paper-making raw materials, and the manufacturers of corrugated paper do not use raw wood pulp obtained by wood production as the paper-making raw materials.
However, in the production process of producing corrugated medium paper and further corrugated paper using waste paper, a large amount of sludge is generated, and particularly in the pulp production process, a large amount of sludge derived from waste paper such as waste paper boxes and waste paper boards is generated, and the cost of the sludge is very complicated, and the sludge contains a large amount of long fibers and short fibers in addition to impurities, microorganisms, and organic matters.
At present, the conventional treatment method for sludge by corrugated paper manufacturing enterprises is to directly convey the sludge to a boiler for burning or to a landfill area for landfill. However, with the advance of environmental protection and clean production, the traditional treatment method of sludge is obviously not suitable, but in the current environment-friendly treatment process of sludge, the cost of environment-friendly treatment of sludge is very high, and because sludge contains a plurality of chemical substances, if sludge is firstly extracted or subjected to impurity removal treatment and then applied, the treatment cost and the application cost of sludge become very high, the application of sludge is limited due to the high treatment cost of sludge, the market popularization is also limited, and therefore improvement is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a clean production method of corrugated medium paper with zero sludge discharge in the pulping process, which reasonably utilizes sludge generated in the production process of the corrugated medium paper.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a clean production method of corrugated medium paper with zero sludge discharge in the pulping process comprises the following steps,
a pulping step, namely putting the recycled waste paper into a pulping barrel for pulping, discharging pulp from a pulp outlet at the middle lower part of the pulping barrel to obtain waste paper raw pulp, and discharging heavy slag from the lower part or the bottom of the pulping barrel;
a hydraulic impurity removal step, namely pumping the raw pulp of the waste paper to a high-frequency vibrating screen through a pulp lifting pump for hydraulic impurity removal treatment, and screening and separating impurities;
a concentration step, namely pumping the waste paper raw pulp subjected to hydraulic impurity removal treatment to a concentrator for concentration treatment, washing slurry by the concentrator and improving the concentration of the slurry to obtain coarse pulp;
a high-concentration filter pressing step, namely pumping the coarse slurry to a high-concentration filter press for high-concentration filter pressing treatment, and performing high-concentration filter pressing at least twice;
a low-concentration filter pressing step, namely pumping the coarse slurry subjected to the high-concentration filter pressing treatment to a low-concentration filter press for low-concentration filter pressing treatment;
flotation deinking, namely performing flotation deinking treatment on the coarse pulp subjected to low-concentration filter pressing treatment;
a low-concentration desanding step, namely performing low-concentration desanding treatment on the coarse pulp subjected to flotation deinking treatment at least twice;
a pulp washing step, namely pumping the coarse pulp subjected to low-concentration desanding treatment to a pulp washer or a rinsing machine for pulp washing treatment, and pumping the coarse pulp to a pulp forming pool for later use to obtain primary pulp;
a pulping step, namely pumping the primary pulp to a pulping machine for pulping, wherein the pulping comprises coarse pulping treatment and fine pulping treatment;
a sedimentation step, namely pumping the primary pulp subjected to the grinding treatment to a sand setting table for sedimentation treatment, and separating impurities to obtain pure pulp;
a step of pulp mixing, in which pure pulp is pumped to a pressure pulp mixing box, and the concentration of the pulp is adjusted and stabilized to obtain papermaking pulp;
a papermaking step, namely pumping papermaking slurry to forming papermaking equipment, spraying the papermaking slurry towards a net part arranged on the forming papermaking equipment through a spray gun, and conveying the papermaking slurry forwards through the net part for dehydration to obtain wet paper;
a pressing step of transferring the wet paper to a dewatering felt through a first vacuum suction shifting roller, and further dewatering the dewatering felt through a pressing roller group;
a drying step, transferring the wet paper carried on the dewatering felt to a drying device through a second vacuum suction shifting roller, and conveying the wet paper forwards through a drying roller provided with the drying device and gradually drying to obtain finished corrugated medium paper;
a subsequent paper forming step, namely performing calendaring treatment, rewinding treatment, slitting treatment and packaging treatment on the calendered corrugated core paper to obtain the corrugated core paper;
wherein the treatment of the sludge comprises the following steps,
a sludge collection step, wherein heavy slag generated in the pulping step and muddy or sandy impurities generated in the later step are collected and then pumped to a sludge storage pool for storage and standby application, so that workshop sludge is obtained;
a sludge dewatering step, namely pumping the workshop sludge to a screw extrusion device by a sludge pump, extruding by the screw extrusion device to remove water, and reducing the water content of the workshop sludge to 5-10% by weight percent to obtain viscous sludge;
a sludge drying and disinfecting step, wherein the slime sludge extruded by the screw extrusion equipment is received by a sludge conveyer belt arranged below an extrusion port of the screw extrusion equipment and conveyed forwards, the sludge conveyer belt passes through a tunnel type sterilizing and drying furnace, the slime sludge on the sludge conveyer belt is scattered and flattened towards two sides by a slow-rotating rotary rake arranged above the sludge conveyer belt, after flattening treatment, the slime sludge is flatly spread on the surface of the sludge conveyer belt, the slime sludge is irradiated by an ultraviolet lamp tube and an infrared lamp tube arranged in the tunnel type sterilizing and drying furnace and is subjected to flattening treatment, the slime sludge is sterilized, dried and dehydrated, and simultaneously odor is removed, so that the completely dry sludge particles with the water content of less than 0.5 percent by weight and in a particle shape are obtained, and the completely dry sludge particles are conveyed to a storage bin for standby;
a material mixing step, namely pumping the fully dried sludge particles to a material mixing hopper through a powder pump, adding poly epsilon caprolactone PCL degraded plastic particles with a melting point of 60-65 ℃ and auxiliary materials into the material mixing hopper, and stirring to obtain a molding raw material of the clay-plastic composite supporting plate, wherein the molding raw material comprises, by weight, 50-60% of the fully dried sludge particles, 30-40% of the poly epsilon caprolactone PCL degraded plastic particles and the balance auxiliary materials, wherein the adding proportion of the fully dried sludge particles is 50-60% of the total weight of the molding raw material;
and a molding step, namely heating and melting the molding raw material, pumping the molding raw material to a supporting plate compression molding mold for molding the supporting plate, wherein the heating temperature of the molding raw material is 1-35 ℃ higher than the melting point of the selected poly epsilon caprolactone PCL degradable plastic particles, and molding the molding raw material by the supporting plate compression molding mold to obtain the clay-plastic composite supporting plate.
In a further technical scheme, in the sludge dewatering step, centrifugal dewatering treatment is firstly carried out, the centrifugal dewatering is carried out on the workshop sludge through a centrifugal dewatering cylinder, and the water content of the workshop sludge is reduced to 30-40% according to the weight percentage; performing light extrusion dehydration treatment, transferring the workshop sludge subjected to centrifugal dehydration treatment to a single-screw extruder for light extrusion dehydration, and reducing the water content of the workshop sludge to 5-10% according to the weight percentage; and finally, carrying out heavy extrusion dehydration treatment, transferring the workshop sludge subjected to the light extrusion dehydration treatment to a double-screw extruder for heavy extrusion dehydration, and reducing the water content of the workshop sludge to be less than 0.5%.
In a further technical scheme, the auxiliary materials comprise industrial wax oil, K-resin and toner, wherein the auxiliary materials comprise, by weight, 65-75% of the K-resin, 20-30% of the industrial wax oil and the balance toner, wherein the K-resin accounts for the total weight of the auxiliary materials.
In a further technical scheme, the sticky sludge received at the extrusion outlet of the screw extrusion device is accumulated in the middle of the sludge conveying belt in a centralized manner, the rotary rake comprises a rotating shaft positioned in the center and a plurality of thin-sheet-shaped sludge pushing sheets fixed on the circumferential surface of the rotating shaft at intervals and extending along the radial direction, each sludge pushing sheet is obliquely arranged relative to the sludge conveying belt, the outer end of each sludge pushing sheet is provided with an arc-shaped sludge pushing part with a high inner part and a low outer part, the outer end of the sludge pushing part of each sludge pushing sheet is provided with a blunt-tooth-shaped comb rake, the length of each sludge pushing sheet along the radial direction gradually decreases from the middle section of the rotating shaft to the two end parts, the minimum distance between the sludge pushing sheets positioned at the two end parts of the rotating shaft and the sludge conveying belt is the spreading height, the sticky sludge on the sludge conveying belt is pushed loose by the sludge pushing sheets of the rotating rotary rake and the blunt-tooth-shaped comb rakes thereof, and the sticky sludge concentrated in the middle of the sludge conveying belt is pushed towards the two sides in the spreading height of the sludge conveying belt, and the sticky sludge is controlled to be 0.5-2cm.
In a further technical scheme, in the step of batching, the melting point of the poly epsilon caprolactone PCL degraded plastic particles is 63 ℃, and the temperature of the softening point of the selected K-resin is less than 70 ℃; in the molding step, the molding raw material is put into a melting barrel to be melted, the molding raw material is heated and molded by a heating pipe spirally wound on the melting barrel, hot water in a boiling water room and/or hot water with the temperature of 70-90 ℃ discharged by a drying roller in the drying step is led out and flows through the heating pipe, and the heating pipe is heated by a water heating mode, so that the poly epsilon caprolactone PCL degradation plastic particles in the melting barrel are melted.
In a further technical scheme, the workshop sludge contains short fibers, the short fibers in the workshop sludge exist in the all-dry sludge particles, and the weight percentage of the short fibers in the all-dry sludge particles is 30-40%.
In a further technical scheme, the conveying speed of the sludge conveying belt is 0.5-2 m/min, the rotating speed of the rotary harrow is 30-50 r/min, and the moving direction of the harrow when the harrow of the rotary harrow rotates to the lowest point is opposite to the advancing direction of the sludge conveying belt.
Compared with the prior art, the invention has the advantages that: in the production process of corrugated paper including corrugated medium paper, sludge generated in the process of using waste paper for papermaking does not need to be purified, and only the sludge dewatering step and the sludge drying and sterilizing step are needed, the environment-friendly degradable clay-plastic composite supporting plate can be obtained through the steps of material preparation and forming, and the production process is clean and environment-friendly.
The invention provides a novel sludge treatment mode for recycling a large amount of sludge without purification treatment, which can consume the sludge generated in workshops every day, and can avoid sludge accumulation, solve the problem that the sludge generated in the paper making process of waste paper making enterprises is accumulated and causes bacteria breeding in the sludge due to untimely treatment, solve the problem that the sludge is stinky, and ensure that the production cost of the clay-plastic composite supporting plate is further lower than that of a wood supporting plate and a plastic supporting plate.
Detailed Description
A clean production method of corrugated medium paper with zero sludge discharge in the pulping process comprises the following steps,
a pulping step, namely putting the recycled waste paper into a pulping barrel for pulping, discharging pulp from a pulp outlet at the middle lower part of the pulping barrel to obtain waste paper raw pulp, and discharging heavy slag from the lower part or the bottom of the pulping barrel;
a hydraulic impurity removal step, namely pumping the waste paper raw pulp to a high-frequency vibrating screen through a pulp pump for hydraulic impurity removal treatment, and screening and separating impurities;
a concentration step, namely pumping the waste paper raw pulp subjected to hydraulic impurity removal treatment to a concentrator for concentration treatment, washing slurry by the concentrator and improving the concentration of the slurry to obtain coarse pulp;
a high-concentration filter pressing step, namely pumping the coarse slurry to a high-concentration filter press for high-concentration filter pressing treatment, and performing high-concentration filter pressing at least twice;
a low-concentration filter pressing step, namely pumping the coarse slurry subjected to the high-concentration filter pressing treatment to a low-concentration filter press for low-concentration filter pressing treatment;
a flotation deinking step, namely performing flotation deinking treatment on the coarse pulp subjected to low-concentration filter pressing treatment;
a low-concentration desanding step, namely performing low-concentration desanding treatment on the coarse pulp subjected to flotation deinking treatment at least twice;
a pulp washing step, namely pumping the coarse pulp subjected to low-concentration desanding treatment to a pulp washer or a rinsing machine for pulp washing treatment, and pumping the coarse pulp to a pulp forming pool for later use to obtain primary pulp;
a pulping step, namely pumping the primary pulp to a pulping machine for pulping, wherein the pulping comprises coarse pulping and fine pulping;
a precipitation step, namely pumping the primary slurry subjected to the grinding treatment to a sand settling plate for precipitation treatment, and separating impurities to obtain pure slurry;
a step of pulp mixing, in which pure pulp is pumped to a pressure pulp mixing box, and the concentration of the pulp is adjusted and stabilized to obtain papermaking pulp;
a papermaking step, namely pumping papermaking slurry to forming papermaking equipment, spraying the papermaking slurry towards a net part arranged on the forming papermaking equipment through a spray gun, and conveying the papermaking slurry forwards through the net part for dehydration to obtain wet paper;
a pressing step of transferring the wet paper to a dewatering felt through a first vacuum suction shifting roller, and further dewatering the dewatering felt through a pressing roller group;
a drying step, transferring the wet paper carried on the dewatering felt to a drying device through a second vacuum suction shifting roller, and conveying the wet paper forwards through a drying roller provided with the drying device and gradually drying to obtain finished corrugated medium paper;
a subsequent step of paper formation, in which the calendered corrugated medium paper is subjected to calendering, rewinding, slitting and packaging to obtain the corrugated medium paper;
wherein the treatment of the sludge comprises the following steps,
a sludge collection step, wherein heavy slag generated in the pulping step and muddy or sandy impurities generated in the later step are collected and then pumped to a sludge storage pool for storage and standby application, so that workshop sludge is obtained;
a sludge dewatering step, namely pumping the workshop sludge to a screw extrusion device by a sludge pump, extruding by the screw extrusion device to remove water, and reducing the water content of the workshop sludge to 5-10% by weight percent to obtain viscous sludge; the specific sludge dewatering treatment comprises the steps of firstly carrying out centrifugal dewatering treatment, carrying out centrifugal dewatering on the workshop sludge through a centrifugal dewatering cylinder, and reducing the water content of the workshop sludge to 30-40% according to the weight percentage; performing light extrusion dehydration treatment, transferring the workshop sludge subjected to centrifugal dehydration treatment to a single-screw extruder for light extrusion dehydration, and reducing the water content of the workshop sludge to 5-10% according to the weight percentage; and finally, carrying out heavy extrusion dehydration treatment, transferring the workshop sludge subjected to light extrusion dehydration treatment to a double-screw extruder for heavy extrusion dehydration, so that the water content of the workshop sludge is reduced to less than 0.5%, carrying out graded gradual dehydration through three different dehydration devices, finishing dehydration in shorter time, and having lower energy consumption for dehydration and more energy conservation and environmental protection.
A sludge drying and disinfecting step, wherein the slime sludge extruded by the screw extrusion equipment is received by a sludge conveying belt arranged below an extrusion port of the screw extrusion equipment and conveyed forwards, the slime sludge received by the extrusion port of the screw extrusion equipment is accumulated in the middle of the sludge conveying belt in a centralized manner, so that the slime sludge is conveniently conveyed by the sludge conveying belt, and is difficult to spill out from the sludge conveying belt in the conveying process, the sludge conveying belt passes through a tunnel type sterilizing and drying furnace, the slime sludge on the sludge conveying belt is scattered and flattened towards two sides by a slowly rotating rotary harrow arranged above the sludge conveying belt, after flattening treatment, the slime sludge is flatly spread on the surface of the sludge conveying belt, the slime sludge is irradiated by an ultraviolet lamp tube and an infrared lamp tube arranged in the tunnel type sterilizing and drying furnace and is subjected to flattening treatment, the slime sludge is sterilized, dried and dehydrated, and deodorized, the completely dry sludge particles in particle shapes with the water content of less than 0.5% by weight percentage are obtained, and the completely dry sludge particles are conveyed to a storage bin for standby;
specifically, the rotary rake comprises a rotating shaft positioned in the center and a plurality of thin-sheet-shaped sludge pushing sheets fixed on the circumferential surface of the rotating shaft at intervals and extending along the radial direction, each sludge pushing sheet is obliquely arranged relative to the sludge conveying belt, the outer end part of each sludge pushing sheet is provided with an arc-shaped sludge pushing part with a higher inner part and a lower outer part, the outer end part of the sludge pushing part of each sludge pushing sheet is provided with a comb rake in a blunt tooth shape, the length of each sludge pushing sheet along the radial direction gradually decreases from the middle section of the rotating shaft to the two end parts, the minimum distance between the sludge pushing sheets and the sludge conveying belts positioned at the two end parts of the rotating shaft is the sludge flattening height, the flattening height of the viscous sludge is controlled to be 0.5-2cm, namely the thickness of the viscous sludge on the sludge conveying belt is not higher than 2cm, namely the thickness of the viscous sludge is controlled to be 0.5-2cm, preferably, the thickness of the viscous sludge is controlled to be 0.5-1cm, and the rotary rake is favorable for better completing disinfection, sterilization, drying and dehydration in the sludge drying and disinfection steps and is lower in energy consumption.
The conveying speed of the sludge conveying belt is 0.5-2 m/min, the rotating speed of the rotary harrow is 30-50 r/min, and the moving direction of the comb harrow when the comb harrow of the rotary harrow rotates to the lowest point is opposite to the advancing direction of the sludge conveying belt. The sludge pushing sheet of the rotary rake and the comb rake in the shape of the blunt teeth push loose the slime sludge on the sludge conveying belt, and push the slime sludge concentrated in the middle of the sludge conveying belt towards two sides in the loosening process, so that the problems of sterilization, degerming and drying dehydration which are caused by the fact that the slime sludge collected at the extrusion port of the screw extrusion equipment is concentrated and accumulated in the middle (necessary) of the sludge conveying belt are solved in a simple mode.
And a material mixing step, namely pumping the fully dried sludge particles to a material mixing hopper through a powder pump, adding the poly epsilon caprolactone PCL degradable plastic particles with the melting point of 60-65 ℃ and auxiliary materials into the material mixing hopper, and stirring to obtain the molding raw material of the clay-plastic composite supporting plate, wherein the molding raw material comprises, by weight, 50-60% of the fully dried sludge particles, 30-40% of the poly epsilon caprolactone PCL degradable plastic particles and the balance auxiliary materials, wherein the adding proportion of the fully dried sludge particles is 50-60% of the total weight of the molding raw material.
The poly epsilon caprolactone PCL degradable plastic is a high molecular material which is obtained by carrying out positive, negative and complex ring-opening polymerization on epsilon-caprolactone and has the molecular weight of more than 10000, the mechanical property and the medium density polyolefin of the poly epsilon caprolactone PCL degradable plastic are similar, the breaking elongation and the elastic modulus of the poly epsilon caprolactone PCL degradable plastic are between LDPE and HDPE, the soft program and the tensile strength of the poly epsilon caprolactone PCL degradable plastic are similar to those of nylon, the poly epsilon caprolactone PCL degradable plastic has very good thermoplasticity and processability, although the price of the poly epsilon caprolactone PCL degradable plastic is very cheap, the application of the poly epsilon caprolactone PCL degradable plastic is also limited due to the fact that the melting point (about 63 ℃) of the poly epsilon caprolactone PCL degradable plastic is too low, however, the invention just utilizes the characteristics of low cost and good mechanical property of the poly epsilon caprolactone PCL degradable plastic, and the use environment for producing the composite plastic supporting plate is not limited by the poly epsilon caprolactone PCL degradable plastic supporting plate.
In addition, the poly epsilon caprolactone PCL degradable plastic has lactone groups in PCL molecules, so that the poly epsilon caprolactone PCL degradable plastic has good physiological compatibility and biodegradability, and the lactone groups also have good physiological compatibility and biodegradability with components such as sludge, fibers and the like in the clay-plastic composite supporting plate, so that the waste clay-plastic composite supporting plate can be completely degraded in a shorter time after landfill treatment.
The auxiliary materials comprise industrial wax oil, K-resin and toner, wherein the adding proportion of the K-resin is 65-75% of the total weight of the auxiliary materials according to the weight percentage, the adding proportion of the industrial wax oil is 20-30% of the total weight of the auxiliary materials, and the balance is the toner. The K-Resin is a block copolymer synthesized by using styrene and butadiene as monomers, using alkyl lithium as an initiator and adopting an anionic solution polymerization technology, and has the main characteristics of high transparency, good impact resistance, small density, strong tinting strength, excellent processability and no toxicity, and the K-Resin copolymer has the characteristic of low density and is more attractive from the economic perspective. The yield of the K-resin is 20-30% higher than that of the non-styrene transparent resin, and meets the regulations of the American food and drug administration FDA 21CFR 177 1640 and the European EEC 90/128/EEC regulatory approval.
The method comprises a forming step, wherein a forming raw material is heated and melted and then pumped to a supporting plate compression molding die for forming a supporting plate, the heating temperature of the forming raw material is 1-35 ℃ higher than the melting point of the selected poly epsilon caprolactone PCL degradable plastic particles, the mud-plastic composite supporting plate is obtained after the forming of the supporting plate compression molding die, the weight ratio of the mud and the poly epsilon caprolactone PCL degradable plastic particles in the mud-plastic composite supporting plate according to the important percentage is 95-99%, and the mud and the poly epsilon caprolactone PCL degradable plastic particles accounting for 95-99% of the weight percentage of the mud-plastic composite supporting plate are both landfilled and degraded, so the produced mud-plastic composite supporting plate is also an environment-friendly degradable product, and the mud generated in the process of making paper by using waste paper does not need to be purified, and only needs to be subjected to the sludge dewatering step and the sludge drying and sterilizing step, the mud-plastic composite supporting plate can be formed through the material preparing step and the forming step, and the production process is clean and environment-friendly.
The melting point of the poly epsilon caprolactone PCL degradable plastic particles is 63 ℃, and the softening point temperature of the selected K-resin is less than 70 ℃; in the forming step, the forming raw materials are put into a melting barrel to be melted, the forming raw materials are heated by a heating pipe spirally coiled on the melting barrel, hot water in a boiling water room and/or hot water discharged by a drying roller in the drying step are led out at 70-90 ℃ and flow through the heating pipe, and the heating pipe is heated by a water heating mode, so that poly epsilon caprolactone PCL degradable plastic particles in the melting barrel are melted.
The sludge accounts for 50-60% of the total weight of the clay-plastic composite supporting plate according to the weight percentage, not only can the sludge generated in the waste paper papermaking process be eliminated in time, the sludge accumulation is avoided, the problems that the sludge generated in the papermaking process of waste paper papermaking enterprises is accumulated due to incapability of timely treatment and causes the sludge to breed bacteria are solved, the problem that the sludge is stinky is solved, and the production cost of the clay-plastic composite supporting plate is further lower than that of a wood supporting plate and a plastic supporting plate.
More importantly, the sludge in the workshop is transferred to the production of the clay sculpture composite supporting plate, the sludge treatment cost for purifying the sludge and treating the sludge is reduced by using waste paper making enterprises for producing corrugated core paper and corrugated paper by using waste paper, and the comprehensive environment-friendly treatment cost for the sludge is more than the material cost of the traditional clay sculpture supporting plate or the traditional stone sculpture supporting plate according to the current environment-friendly requirement.
The poly-epsilon-caprolactone PCL degradable plastic particles and the K-resin play a role in binding, part of viscous substances reserved in workshop sludge also has a binding role, particularly, the workshop sludge contains short fibers, the workshop sludge is not subjected to other treatment processes such as purification treatment, the short fibers in the workshop sludge can be perfectly reserved, namely the short fibers in the workshop sludge exist in the all-dry sludge particles, the weight percentage of the all-dry sludge particles is 30-40%, the adhesion firmness of the clay-plastic composite supporting plate can be improved due to the short fibers, the structural strength of the clay-plastic composite supporting plate is improved, the bending resistance modulus of the clay-plastic composite supporting plate is close to that of the plastic supporting plate, and the rigidity, the bearing capacity, the wear resistance, the impact resistance and the like of the clay-plastic composite supporting plate are higher than those of the plastic supporting plate.
Table 1 shows experimental data obtained by testing ten performance indexes of a 40mm thick clay-plastic composite supporting plate and a 40mm thick plastic supporting plate respectively.
| The invention relates to a clay sculpture composite supporting plate with the thickness of 40mm | Plastic supporting plate with thickness of 40mm | |
| Rigidity of the film | Elastic modulus of 4.0GPa | Elastic modulus of 3.7GPa |
| Load bearing property | Maximum load of 3.0kn | Maximum load of 2.0kn |
| Wear resistance | Surface hardness Shore 75 | Surface hardness Shore 70 |
| Impact resistance | Impact strength of 25KJ/m 2 | Impact strength of 20KJ/m 2 |
| Corrosion resistance | Resistant to most of acid, alkali and salt | Resistant to most of acid, alkali and salt |
| Wear resistance | Low temperature resistance of-40 deg.C and high temperature resistance of 40 deg.C | Low temperature resistance of-40 deg.c and high temperature resistance of 90 deg.c |
| Water immersion resistance | Surface water absorption rate less than 0.5 | Surface water absorption rate less than 0.5 |
| Life span | 1 year | 5 years old |
| Density of | Density > 1 | Density < 1 |
| High cost performance | Super high | Is low with |
TABLE 1
The above description is only a preferred embodiment of the present invention, and it should not be understood that the present invention is limited to the details of the embodiment and the range of applications, which can be changed by those skilled in the art according to the spirit of the present invention.
Claims (5)
1. A clean production method of corrugated medium paper with zero sludge discharge in the pulping process is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
a pulping step, namely putting the recycled waste paper into a pulping barrel for pulping, discharging pulp from a pulp outlet at the middle lower part of the pulping barrel to obtain waste paper raw pulp, and discharging heavy slag from the lower part or the bottom of the pulping barrel;
a hydraulic impurity removal step, namely pumping the waste paper raw pulp to a high-frequency vibrating screen through a pulp pump for hydraulic impurity removal treatment, and screening and separating impurities;
a concentration step, namely pumping the waste paper raw pulp subjected to hydraulic impurity removal treatment to a concentrator for concentration treatment, washing the slurry through the concentrator and improving the concentration of the slurry to obtain coarse pulp;
a high-concentration filter pressing step, namely pumping the coarse slurry to a high-concentration filter press for high-concentration filter pressing treatment, and performing high-concentration filter pressing at least twice;
a low-concentration filter pressing step, namely pumping the coarse slurry subjected to the high-concentration filter pressing treatment to a low-concentration filter press for low-concentration filter pressing treatment;
flotation deinking, namely performing flotation deinking treatment on the coarse pulp subjected to low-concentration filter pressing treatment;
a low-concentration desanding step, in which the coarse pulp subjected to flotation deinking treatment is subjected to low-concentration desanding treatment at least twice;
a pulp washing step, namely pumping the coarse pulp subjected to low-concentration desanding treatment to a pulp washer or a rinsing machine for pulp washing treatment, and pumping the coarse pulp to a pulp forming pool for later use to obtain primary pulp;
a pulping step, namely pumping the primary pulp to a pulping machine for pulping, wherein the pulping comprises coarse pulping treatment and fine pulping treatment;
a sedimentation step, namely pumping the primary pulp subjected to the grinding treatment to a sand setting table for sedimentation treatment, and separating impurities to obtain pure pulp;
a step of pulp mixing, in which pure pulp is pumped to a pressure pulp mixing box, and the concentration of the pulp is adjusted and stabilized to obtain papermaking pulp;
a papermaking step, namely pumping papermaking slurry to forming papermaking equipment, spraying the papermaking slurry towards a net part arranged on the forming papermaking equipment through a spray gun, and conveying the papermaking slurry forwards through the net part for dehydration to obtain wet paper;
a pressing step of transferring the wet paper to a dewatering felt through a first vacuum suction shifting roller, and further dewatering the dewatering felt through a pressing roller group;
a drying step, transferring the wet paper carried on the dewatering felt to a drying device through a second vacuum suction shifting roller, and conveying the wet paper forwards through a drying roller provided with the drying device and gradually drying to obtain finished corrugated medium paper;
a subsequent paper forming step, namely performing calendaring treatment, rewinding treatment, slitting treatment and packaging treatment on the calendered corrugated core paper to obtain the corrugated core paper;
wherein the treatment of the sludge comprises the following steps,
a sludge collection step, wherein heavy slag generated in the pulping step and muddy or sandy impurities generated in the later step are collected and pumped to a sludge storage pool for storage and standby application to obtain workshop sludge;
a sludge dewatering step, namely pumping the workshop sludge to a screw extrusion device by a sludge pump, extruding by the screw extrusion device to remove water, and reducing the water content of the workshop sludge to 5-10% by weight percent to obtain viscous sludge;
in the sludge dewatering step, centrifugal dewatering treatment is firstly carried out, the workshop sludge is centrifugally dewatered through a centrifugal dewatering cylinder, and the water content of the workshop sludge is reduced to 30-40% according to the weight percentage; performing light extrusion dehydration treatment, transferring the workshop sludge subjected to centrifugal dehydration treatment to a single-screw extruder for light extrusion dehydration, and reducing the water content of the workshop sludge to 5-10% according to the weight percentage; finally, carrying out heavy extrusion dehydration treatment, transferring the workshop sludge subjected to light extrusion dehydration treatment to a double-screw extruder for heavy extrusion dehydration, and reducing the water content of the workshop sludge to be less than 0.5%;
the method comprises the steps that the obtained sticky sludge is collected and accumulated in the middle of a sludge conveying belt at an extrusion port of a screw extrusion device, a rotary rake comprises a rotating shaft positioned in the center and a plurality of thin-sheet-shaped sludge pushing sheets which are fixed on the circumferential surface of the rotating shaft at intervals and extend along the radial direction, each sludge pushing sheet is obliquely arranged relative to the sludge conveying belt, the outer end part of each sludge pushing sheet is provided with an arc-shaped sludge pushing part with a high inner part and a low outer part, the outer end part of the sludge pushing part of each sludge pushing sheet is provided with a comb rake in a blunt tooth shape, the length of each sludge pushing sheet along the radial direction gradually decreases from the middle section of the rotating shaft to the two end parts, the minimum distance between the sludge pushing sheet positioned at the two end parts of the rotating shaft and the sludge conveying belt is the sludge flattening height, the sticky sludge on the sludge conveying belt is pushed loose by each sludge pushing sheet of the rotating rotary rake and the comb rake in the blunt tooth shape, the sticky sludge pushing sheet centralized in the middle of the sludge conveying belt is pushed towards the two sides in the loosening process, and the sticky sludge flattening height is controlled to be 0.5-2cm;
a sludge drying and disinfecting step, wherein the slime sludge extruded by the screw extrusion equipment is received by a sludge conveying belt arranged below an extrusion port of the screw extrusion equipment and conveyed forwards, the sludge conveying belt passes through a tunnel type disinfecting and drying furnace, the slime sludge on the sludge conveying belt is scattered by a slowly rotating rotary harrow arranged above the sludge conveying belt and is flattened towards two sides, after flattening treatment, the slime sludge is spread on the surface of the sludge conveying belt, the slime sludge is irradiated by an ultraviolet lamp tube and an infrared lamp tube arranged in the tunnel type disinfecting and drying furnace and is subjected to flattening treatment, the slime sludge is disinfected, sterilized, dried and dehydrated, and simultaneously odor is removed, completely dry sludge particles with the water content of less than 0.5 percent in percentage by weight and in a particle shape are obtained, and the completely dry sludge particles are conveyed to a storage bin for standby;
a material mixing step, namely pumping the fully dried sludge particles to a material mixing hopper through a powder pump, adding poly epsilon caprolactone PCL degraded plastic particles with a melting point of 60-65 ℃ and auxiliary materials into the material mixing hopper, and stirring to obtain a molding raw material of the clay-plastic composite supporting plate, wherein the molding raw material comprises, by weight, 50-60% of the fully dried sludge particles, 30-40% of the poly epsilon caprolactone PCL degraded plastic particles and the balance auxiliary materials, wherein the adding proportion of the fully dried sludge particles is 50-60% of the total weight of the molding raw material;
and a forming step, namely heating and melting the forming raw material, pumping the heated and melted forming raw material to a supporting plate compression molding forming die for forming the supporting plate, wherein the heating temperature of the forming raw material is 1-35 ℃ higher than the melting point of the selected poly epsilon caprolactone PCL degradable plastic particles, and forming the forming raw material by the supporting plate compression molding forming die to obtain the clay-plastic composite supporting plate.
2. The method for cleanly producing the corrugated medium paper with zero sludge discharge in the pulping process according to claim 1, is characterized in that: the auxiliary materials comprise industrial wax oil, K-resin and toner, wherein the auxiliary materials comprise, by weight, 65-75% of the K-resin, 20-30% of the industrial wax oil and the balance toner, wherein the K-resin accounts for the total weight of the auxiliary materials.
3. The method for cleanly producing the corrugated medium paper with zero sludge discharge in the pulping process according to claim 2, is characterized in that: in the step of proportioning, the melting point of the poly epsilon caprolactone PCL degradable plastic particles is 63 ℃, and the softening point temperature of the selected K-resin is lower than 70 ℃; in the molding step, the molding raw material is put into a melting barrel to be melted, the molding raw material is heated and molded by a heating pipe spirally wound on the melting barrel, hot water in a boiling water room and/or hot water with the temperature of 70-90 ℃ discharged by a drying roller in the drying step is led out and flows through the heating pipe, and the heating pipe is heated by a water heating mode, so that the poly epsilon caprolactone PCL degradation plastic particles in the melting barrel are melted.
4. The method for cleanly producing the corrugated medium paper with zero sludge discharge in the pulping process according to claim 3, is characterized in that: the workshop sludge contains short fibers, the short fibers in the workshop sludge exist in the all-dry sludge particles, and the weight percentage of the short fibers in the all-dry sludge particles is 30-40%.
5. The method for cleanly producing the corrugated medium paper with zero sludge discharge in the pulping process according to claim 4, is characterized in that: the conveying speed of the sludge conveying belt is 0.5-2 m/min, the rotating speed of the rotary rake is 30-50 r/min, and the moving direction of the comb rake when the comb rake of the rotary rake rotates to the lowest point is opposite to the advancing direction of the sludge conveying belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011563509.9A CN112796147B (en) | 2020-12-25 | 2020-12-25 | Clean production method of corrugated medium paper with zero sludge discharge in pulping process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011563509.9A CN112796147B (en) | 2020-12-25 | 2020-12-25 | Clean production method of corrugated medium paper with zero sludge discharge in pulping process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112796147A CN112796147A (en) | 2021-05-14 |
| CN112796147B true CN112796147B (en) | 2022-11-25 |
Family
ID=75804926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011563509.9A Active CN112796147B (en) | 2020-12-25 | 2020-12-25 | Clean production method of corrugated medium paper with zero sludge discharge in pulping process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112796147B (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0978479A (en) * | 1995-09-19 | 1997-03-25 | Gakunan Daiichi Seishi Kyodo Kumiai | Molding of paper sludge |
| KR100324071B1 (en) * | 1999-06-02 | 2002-02-16 | 김태진 | Process for preparing compound material using waste sludge from Korean Paper production process |
| EP1129612A3 (en) * | 2000-02-29 | 2002-07-24 | Nisshinbo Industries, Inc. | Biodegradable tray for raising seedlings |
| JP2003137349A (en) * | 2001-10-30 | 2003-05-14 | Toppan Printing Co Ltd | Mat mainly consisting of vegetable fiber, and three- dimensional article formed thereof |
| FI20145775A (en) * | 2014-09-05 | 2016-03-06 | Upm Kymmene Corp | composite Material |
| CN107604724B (en) * | 2017-11-01 | 2019-01-25 | 东莞市泰昌纸业有限公司 | The method for recycling paper mill sludge production brown paper |
| CN107619170B (en) * | 2017-11-01 | 2019-03-29 | 东莞市泰昌纸业有限公司 | A kind of curing and drying processing method of paper mill sludge |
| CN108570884B (en) * | 2018-04-02 | 2019-05-07 | 东莞市泰昌纸业有限公司 | A method of heavy wrapping craft paper is reproduced using paper mill sludge |
| CN109537350B (en) * | 2018-12-17 | 2021-06-29 | 东莞顺裕纸业有限公司 | Production process for producing high-strength corrugated paper by using waste paper |
| CN111547978A (en) * | 2020-05-27 | 2020-08-18 | 沈丹 | Filter-pressing rotary disc drying system for sludge recovery treatment and treatment method |
-
2020
- 2020-12-25 CN CN202011563509.9A patent/CN112796147B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112796147A (en) | 2021-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2008270600B2 (en) | Use of cyclodextrins for odor control in papermaking sludges, and deodorized sludge and products | |
| CN104818640B (en) | Bioanalysis extracts Plant fiber's manufacturing technique method | |
| CN102873787B (en) | Waste plastic film decolouring regeneration method and system | |
| CN109576825B (en) | Cleaning-free waste regeneration process | |
| CN108570884B (en) | A method of heavy wrapping craft paper is reproduced using paper mill sludge | |
| CN110699994A (en) | Corrugated raw paper production process without waste liquid discharge | |
| CN112796147B (en) | Clean production method of corrugated medium paper with zero sludge discharge in pulping process | |
| CN101333045B (en) | Method for treating backwater in stages and recovering the backwater in production of sheet by paper-making method | |
| CN109652872B (en) | Polyester waste regeneration system | |
| CN103998138A (en) | Separation method and apparatus | |
| CN105332311B (en) | Papermaking to zero discharge standard production line | |
| CN107938421B (en) | Recycled paper manufacturing method and recycled paper | |
| CN112479755A (en) | Process for decomposing wet garbage into organic compounds | |
| WO1998048991A1 (en) | Wound product cores and processes for making them | |
| CN101327990A (en) | Method for processing sewerage by A/O biological contact oxidation process | |
| CN101186365A (en) | Decontamination method for paper plane | |
| CN205270317U (en) | Plastic fiber separating centrifuge | |
| CN110395830B (en) | Efficient treatment process and system for community domestic sewage | |
| CN2782672Y (en) | Mud dewatering machine | |
| CN109576826B (en) | Polyester waste recycling process | |
| CN202742573U (en) | High-speed impurity separating and drying system of waste plastic film regeneration production line | |
| CN105499255A (en) | Plastic fiber separator and separating method | |
| CN105780563B (en) | A kind of heat of oxidation of zero-emission rubs combination legal system straw pulp technique with the hands | |
| CN1202030C (en) | Water water treating technique for algea processing industry | |
| CN218345293U (en) | Alcohol production wastewater treatment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |