WO2022028201A1 - 一种干法废纸浆及其制备方法 - Google Patents

一种干法废纸浆及其制备方法 Download PDF

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WO2022028201A1
WO2022028201A1 PCT/CN2021/105175 CN2021105175W WO2022028201A1 WO 2022028201 A1 WO2022028201 A1 WO 2022028201A1 CN 2021105175 W CN2021105175 W CN 2021105175W WO 2022028201 A1 WO2022028201 A1 WO 2022028201A1
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Prior art keywords
waste paper
dry
pulp
paper pulp
outlet groove
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PCT/CN2021/105175
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English (en)
French (fr)
Inventor
贺文明
王道林
文学芬
王启录
周后炼
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山鹰纸业(广东)有限公司
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Priority claimed from CN202010793207.4A external-priority patent/CN112030588B/zh
Priority claimed from CN202010792973.9A external-priority patent/CN112048928A/zh
Application filed by 山鹰纸业(广东)有限公司 filed Critical 山鹰纸业(广东)有限公司
Publication of WO2022028201A1 publication Critical patent/WO2022028201A1/zh

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
    • D21B1/08—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods the raw material being waste paper; the raw material being rags
    • D21B1/10—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods the raw material being waste paper; the raw material being rags by cutting actions
    • 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

Definitions

  • the present application relates to the technical field of waste paper treatment, in particular to a dry process waste paper pulp and a preparation method thereof.
  • waste paper as papermaking raw material can not only alleviate the shortage of papermaking raw materials and the contradiction between energy consumption, conform to the concept of sustainable development, but also reduce the increasingly serious environmental pollution problem; compared with the direct use of commercial pulp board, it can also effectively reduce costs .
  • waste paper treatment process is mainly composed of a disintegration system, a screening system, a fiber classification screen, a multi-disc concentration and a disc-type thermal dispersion system.
  • Waste paper disintegration is the most critical step in the waste paper pulping system, because the result of disintegration mainly affects the fiber dispersion of the waste paper, the peeling and redeposition of ink from the fibers, and the separation and re-deposition of contaminants such as stickies from the fibers. bond.
  • waste paper disintegration mainly uses hydraulic pulper (horizontal drum type high-consistency continuous disintegrator and vertical high-consistency intermittent disintegrator) to disintegrate waste paper under certain disintegration conditions.
  • the process needs to consume a lot of water and disintegration aids (disintegration aids are added to the pulping system to make the fibers produce various effects such as wetting, penetration and dispersion to assist in the disintegration of waste paper. It not only pollutes the environment but also increases energy consumption.) to wet, penetrate and disperse fibers, resulting in higher cost and higher energy consumption; the drum type high-consistency continuous disintegrator has a long disintegration time and cannot be adjusted. Relatively mild, but due to long disintegration time, it will increase the re-adhesion and redeposition of ink or pigment to fibers, and the pulp quality is not good.
  • One of the purposes of the present application is to provide a method for preparing dry-process waste paper pulp, which can reduce the amount of water in the preparation process, avoid the use of disintegration aids, and prevent ink or pigment from re-adhering and
  • the reduction of pulp quality by redeposition on fibers can reduce production costs, environmental pollution and energy consumption, and improve pulp quality.
  • the second purpose of the present application is to provide a dry process waste paper pulp prepared by the above preparation method.
  • the present application provides a method for preparing dry-process waste paper pulp, the steps of which include:
  • step (3) magnetic separation is carried out on the shredded waste paper in step (3), then rubbing and dividing, and adding water in the process of rubbing and dividing to obtain dry pulp;
  • step (4) The dry pulp of step (4) is squeezed and packed.
  • the method for preparing dry waste paper pulp removes light and heavy impurities mixed in waste paper through dry screening, reduces equipment wear and improves pulp quality; and then removes iron from waste paper, Remove metal substances such as iron wires or iron blocks in waste paper, avoid entering subsequent equipment to damage equipment and unnecessary downtime in papermaking, thereby affecting production efficiency and productivity; by shredding waste paper to facilitate magnetic separation to fully screen out metals, Avoid the impact on the subsequent equipment and pulp quality; the magnetic separation process is to further remove the metal (such as iron) in the waste paper after the waste paper is shredded, so as to ensure the effect of rubbing and dividing; Relieve waste paper fibers, separate impurities and fibers to the greatest extent, dissociate the fibers originally interwoven into paper sheets into single fibers to the greatest extent, and maintain the original shape and strength of the fibers to the greatest extent, which can reduce the amount of water.
  • disintegration aids it does not need to use disintegration aids, and it can also prevent the re-adhesion and redeposition of inks or pigments on fibers due to long disintegration time, which can not only reduce production costs, environmental pollution and energy consumption, but also improve the pulp quality. quality.
  • the waste paper is torn into pieces of waste paper of 30-50 mm, and the waste paper is torn evenly, which is more conducive to subsequent magnetic separation.
  • step (4) the kneading and splitting is realized by a twin-screw extruding and loosening machine.
  • the twin-screw extruding and decomposing machine has two screws, each of the screws is provided with at least one set of screw members, and the screw members are provided with a spiral outlet groove, and the diameter of the spiral outlet groove is 8-34 mm. and 15 to 50mm.
  • the amount of water added is 10% to 30% of the weight of the waste paper.
  • the screw is provided with multiple sets of helical elements at intervals along the extrusion direction, each group of helical elements is provided with a helical outlet groove, and the diameter of the helical outlet groove is constant or gradually decreases.
  • the screw is provided with three sets of helical elements at intervals along the extrusion direction, which are respectively the first group of helical elements, the second group of helical elements and the third group of helical elements, respectively corresponding to the first helical outlet groove and the second helical outlet.
  • the diameter of the first spiral outlet groove, the diameter of the second spiral outlet groove and the diameter of the third spiral outlet groove are respectively 24mm, 22mm and 20mm.
  • alkali is added in the process of kneading and dividing, and the amount of alkali added is less than or equal to 1% of the weight of the waste paper.
  • the base can be, but not limited to, sodium hydroxide, potassium hydroxide.
  • the content of water added is 30% of the weight of the waste paper, and the content of the alkali added is 1% of the weight of the waste paper.
  • step (8) thermally dispersing the pulp treated in step (7) to obtain pulp.
  • Steps (1)-(5) are used to simply treat the waste paper to obtain coarse pulp, and then the coarse pulp is further processed through steps (6)-(8) to obtain fine pulp, and the impurities in the pulp are removed by means of a pressure coarse screen , and then enter the fiber classification screen to separate the long fibers and short fibers in the pulp, save energy, improve the quality of the pulp, and rationally use the fiber components after classification; with the help of the multi-disc filter, the pulp can be effectively reduced.
  • the water consumption of the material is improved; the sticky substance adhering to the fiber is peeled off from the fiber by thermal dispersion treatment, and the quality of the pulp is improved.
  • step (6) the pressure coarse sieve is first subjected to hole sieving, and then to slot sieve, and the size of the hole sieve is larger than that of the slot sieve.
  • the heating method of the thermal dispersion treatment adopts steam to heat the slurry.
  • the temperature of the thermal dispersion treatment is 100-105°C.
  • the present application also provides a method for preparing dry-process waste paper pulp, the steps of which include:
  • step (3) magnetic separation is carried out on the shredded waste paper in step (3), then rubbing and dividing, and adding water in the process of rubbing and dividing to obtain dry pulp;
  • step (7) thermally dispersing the pulp treated in step (6) to obtain pulp.
  • the present application also provides a method for preparing dry-process waste paper pulp, the steps of which include:
  • step (3) magnetic separation is carried out on the shredded waste paper of step (2), then rubbing and dividing, and adding water in the process of rubbing and dividing to obtain slurry;
  • step (3) the slurry of step (3) is first subjected to a pressure coarse screen to remove impurities, and then enters a fiber grading screen to separate long fibers and short fibers in the slurry;
  • step (6) thermally dispersing the pulp treated in step (5) to obtain pulp.
  • the present application also provides a dry-process waste paper pulp, which is prepared by the above-mentioned preparation method of dry-process waste paper pulp.
  • FIG. 1 is a schematic structural diagram of a screw in the preparation method of dry-process waste paper pulp of the present application.
  • the application provides a method for preparing dry-process waste paper pulp, the steps of which include:
  • step (3) magnetic separation is carried out on the shredded waste paper in step (3), then rubbing and dividing, and adding water in the process of rubbing and dividing to obtain dry pulp;
  • step (4) The dry pulp of step (4) is squeezed and packed.
  • step (1) dry screening is used to remove light and heavy impurities (such as glass, iron nails, sand and stones, etc.) mixed in the waste paper, so as to reduce equipment wear and improve pulp quality.
  • light and heavy impurities such as glass, iron nails, sand and stones, etc.
  • step (2) the iron wire or iron block and other metal substances in the waste paper are removed by the waste paper iron removal equipment, so as to avoid the unnecessary downtime of equipment damage and paper making in the subsequent equipment, thereby affecting the production efficiency and production capacity.
  • step (3) a shredder is used to shred the waste paper into waste paper pieces of uniform size, and the length and width of the waste paper pieces are both 30-50 mm.
  • step (4) the metal is firstly screened out by magnetic separation, for example, metal iron and stainless steel are extracted by magnetic force. Then, the twin-screw extruding and decompressing machine is used to realize kneading and splitting, fully decompress the waste paper fibers, separate impurities and fibers to the greatest extent, and dissociate the fibers that were originally interwoven into paper sheets into single fibers to the greatest extent while maintaining maximum retention.
  • the original shape and strength of the fiber at the same time, add water during the process of kneading and splitting, and the amount of water added is 10% to 30% of the amount of waste paper. solution), the amount of alkali added is less than or equal to 1% of the weight of the waste paper to further protect the fibers.
  • kneading and splitting reduces the amount of water, eliminates the need for disintegration aids, and prevents poor pulp quality due to long disintegration times resulting in re-adhesion and redeposition of inks or pigments to fibers.
  • the twin-screw extruding and decomposing machine has two screws 100, each screw 100 is provided with at least one set of screw members 101, and the screw members are provided with a spiral outlet groove 103, and the diameter of the spiral outlet groove 103 is 8 ⁇ 34mm and 15 ⁇ 50mm.
  • the pulp is kneaded and separated under the action of the screw 100, and the separation is realized by means of the spiral outlet groove 103.
  • the screw 100 is provided with multiple sets of helical elements 101 at intervals along the extrusion direction K, each group of helical elements is provided with a helical outlet groove 103, and the diameter of the helical outlet groove 103 is constant or gradually decreases.
  • FIG. 1 only shows a schematic structural diagram of one screw 100 , and the other screw has the same structure as the screw 100 , and the parallel arrangement is called a twin screw.
  • the screw 100 is provided with three sets of helical elements 101 at intervals along the extrusion direction K, namely the first group of helical elements 10 , the second group of helical elements 20 and the third group of helical elements 30 , respectively corresponding to the first helical outlet grooves 11.
  • the second spiral outlet groove 21 and the third spiral outlet groove 31, the diameter of the first spiral outlet groove 11, the diameter of the second spiral outlet groove 21 and the diameter of the third spiral outlet groove 31 are respectively 24mm, 22mm and 20mm.
  • the amount of water added in the process of kneading and splitting is 30% of the weight of the waste paper, and the amount of dilute alkali added is 1% of the weight of the waste paper, and the quality of the fibers obtained is good.
  • step (5) the dry pulp is transported into a baler for extrusion packing, the packing pressure is 300tons, and the packing size is W1100 ⁇ H1100 ⁇ L (500-1800) mm.
  • the packing system After packing, enter the packaging system, wrap it with kraft paper, fix it with iron wire, and then put it into storage or load it for transportation.
  • step (5) If the quality of the pulp obtained in step (5) needs to be further improved, the following steps are carried out to the pulp packed in step (5):
  • step (8) thermally dispersing the pulp treated in step (7) to obtain pulp.
  • step (6) firstly carry out a pressure rough screen to remove impurities by using a pulp screen, and the pressure rough screen is carried out by a pressure rough screen equipment.
  • the use of the pressure coarse screen can remove the plastic particles, foam, knots, shredded paper, plastic chips, stickies and fiber bundles in the slurry suspension, thus providing convenience and efficiency for the fiber grading screen.
  • the pressure coarse sieve is first subjected to hole sieving, and then to slot sieve, and the size of the hole sieve is larger than that of the slot sieve.
  • the perforated screen is used to remove the heavier and larger waste impurities in the slurry, and at the same time, it can also protect the slit screen from damage.
  • the heavy impurities such as metal and sand in the pulp are removed by a high-consistency slag remover, and then a pressure coarse screen is used.
  • the slurry enters a multi-disc filter, and is filtered in the multi-disc filter to purify the slurry.
  • step (8) the sticky substance adhering to the fiber is peeled off from the fiber by thermal dispersion treatment, and the heating method of the thermal dispersion treatment adopts steam to heat the slurry to improve the dispersion effect.
  • the slurry is uniformly and rapidly mixed with the incoming steam in the heater and preheated to a temperature of 85-105°C. Under the action, the slurry passes between the two discs in turn, and the gap between the two discs is 0.3-0.5 mm.
  • the remaining in the slurry can not be removed in the screening, purification, flotation and other processes, but the small sticky matter, ink, wax and other substances visible to the naked eye are softened, and then rely on the friction between fibers, The mechanical action between the fibers and the dispersing teeth refines them and disperses the invisible dust points into the slurry. Further, the temperature of the heat dispersion treatment is 100-105°C.
  • a preparation method of dry-process waste paper pulp the steps of which include:
  • step (3) The waste paper after being shredded in step (3) is firstly screened for metals (such as iron, stainless steel) by magnetic separation, and then the twin-screw extrusion and decompression machine is used to realize the kneading and dividing, and at the same time, water is added during the process of kneading and dividing. , to produce dry pulp.
  • metals such as iron, stainless steel
  • the twin-screw extrusion and decompression machine is used to realize the kneading and dividing, and at the same time, water is added during the process of kneading and dividing. , to produce dry pulp.
  • the amount of water added in the twin-screw extruding and decomposing machine is 20% of the weight of the waste paper, and the screws are spaced along the extrusion direction with three groups of helical elements, namely the first group of helical elements, the second group of helical elements and the third group of helical elements.
  • a set of screw members respectively corresponding to the first spiral outlet groove, the second spiral outlet groove and the third spiral outlet groove, the diameter of the first spiral outlet groove, the diameter of the second spiral outlet groove and the diameter of the third spiral outlet groove are respectively 24mm, 22mm and 20mm;
  • the resulting dry pulp fiber has a length of 1.65 mm, a fiber width of 28.6 ⁇ m, and a fiber aspect ratio of 57.7.
  • the dry pulp is transported to the baler for extrusion packing, the packing pressure is 300tons, and the packing size is W1100 ⁇ H1100 ⁇ L(500 ⁇ 1800)mm. After packing, it enters the packing system and is packed with kraft paper. After the wire is fixed, it is put into storage or loaded for transportation.
  • a preparation method of dry-process waste paper pulp the steps of which include:
  • step (3) The waste paper after being shredded in step (3) is firstly screened for metals by magnetic separation, and then a twin-screw extruding and decomposing machine is used to realize kneading and dividing, and at the same time, water is added during the process of kneading and dividing to obtain dry pulp.
  • the amount of water added is 10% of the weight of the waste paper
  • the screw is provided with three sets of screw members at intervals along the extrusion direction, which are the first set of screw members, the second set of screw members and the third set of screw members, respectively corresponding to the first set of screw members.
  • a spiral outlet groove, a second spiral outlet groove and a third spiral outlet groove, the diameter of the first spiral outlet groove, the diameter of the second spiral outlet groove and the diameter of the third spiral outlet groove are respectively 24mm, 22mm and 20mm;
  • the fiber length of the prepared dry pulp was 1.54 mm, the fiber width was 29.5 ⁇ m, and the fiber aspect ratio was 52.3.
  • a preparation method of dry-process waste paper pulp the steps of which include:
  • step (3) The waste paper after being shredded in step (3) is firstly screened for metals by magnetic separation, and then a twin-screw extruding and decomposing machine is used to realize kneading and dividing, and at the same time, water is added during the process of kneading and dividing to obtain dry pulp.
  • the amount of water added is 20% of the weight of the waste paper
  • the screw is provided with three sets of screw members at intervals along the extrusion direction, which are the first set of screw members, the second set of screw members and the third set of screw members, respectively corresponding to the first set of screw members.
  • a spiral outlet groove, a second spiral outlet groove and a third spiral outlet groove, the diameter of the first spiral outlet groove, the diameter of the second spiral outlet groove and the diameter of the third spiral outlet groove are respectively 18mm, 18mm and 16mm;
  • the fiber length of the prepared dry pulp was 1.55 mm, the fiber width was 29.6 ⁇ m, and the fiber aspect ratio was 52.
  • a preparation method of dry-process waste paper pulp the steps of which include:
  • step (3) The waste paper after being shredded in step (3) is firstly screened for metals by magnetic separation, and then a twin-screw extruding and decomposing machine is used to realize kneading and dividing, and at the same time, water is added during the process of kneading and dividing to obtain dry pulp.
  • the amount of water added is 30% of the weight of the waste paper
  • the screw is provided with three sets of screw members at intervals along the extrusion direction, which are the first set of screw members, the second set of screw members and the third set of screw members, respectively corresponding to the first set of screw members.
  • a spiral outlet groove, a second spiral outlet groove and a third spiral outlet groove, the diameter of the first spiral outlet groove, the diameter of the second spiral outlet groove and the diameter of the third spiral outlet groove are respectively 24mm, 22mm and 20mm;
  • the obtained dry pulp fiber has a length of 1.70 mm, a fiber width of 28.2 ⁇ m, and a fiber aspect ratio of 60.2.
  • a preparation method of dry-process waste paper pulp the steps of which include:
  • step (3) the waste paper after being shredded in step (3) is firstly screened for metal by magnetic separation, and then a twin-screw extruding and decomposing machine is used to realize kneading and dividing, and at the same time, water and dilute alkali are added in the process of kneading and dividing to obtain dry pulp.
  • the amount of water added is 30% of the weight of the waste paper
  • the amount of dilute alkali added in the machine is 1% of the weight of the waste paper
  • the screw is spaced along the extrusion direction.
  • the helical member and the third group of helical members are respectively set in the first helical outlet groove, the second helical outlet groove and the third helical outlet groove, the diameter of the first helical outlet groove, the diameter of the second helical outlet groove and the The diameters of the outlet grooves are 24mm, 22mm and 20mm respectively;
  • the resulting dry pulp fiber has a length of 1.75 mm, a fiber width of 28.0 ⁇ m, and a fiber aspect ratio of 62.5.
  • a dry-process waste paper pulping method the steps of which include:
  • step (3) The waste paper shredded in step (2) is firstly screened for metals by magnetic separation, and then a twin-screw extruding and decompressing machine is used to realize kneading and dividing, fully decompressing waste paper fibers, and separating impurities and fibers to the greatest extent. Dissociate the fibers originally woven into paper sheets into single fibers to the greatest extent and maintain the original shape and strength of the fibers to the greatest extent. At the same time, water is added during the process of kneading and splitting, and the amount of water added is 10% of the amount of waste paper. Slurry was prepared.
  • step (3) The slurry of step (3) is sent to the high-concentration slag remover, and then the pulp screen is used to first carry out a pressure coarse screen to remove impurities (plastic particles, foam, knots, shredded paper, plastic sheets, adhesive
  • the pressure can be set according to the needs. After the pressure coarse screen treatment, it enters the fiber classification screen to separate the long fibers and short fibers in the pulp to obtain pulp.
  • a dry-process waste paper pulping method the steps of which include:
  • step (3) The waste paper shredded in step (2) is firstly screened for metals by magnetic separation, and then a twin-screw extruding and decompressing machine is used to realize kneading and dividing, fully decompressing waste paper fibers, and separating impurities and fibers to the greatest extent. Dissociate the fibers originally woven into paper sheets into single fibers to the greatest extent and maintain the original shape and strength of the fibers to the greatest extent. At the same time, water is added during the process of kneading and splitting, and the amount of water added is 10% of the amount of waste paper. Slurry was prepared.
  • step (3) The slurry of step (3) is sent to the high-concentration slag remover, and then the pulp screen is used to first carry out a pressure coarse screen to remove impurities (plastic particles, foam, knots, shredded paper, plastic sheets, adhesive materials and fiber bundles and other sundries), the pressure can be set according to needs, after the pressure coarse screen treatment, it enters the fiber grading screen to separate the long fibers and short fibers in the slurry;
  • step (4) The pulp treated in step (4) is sent to a multi-disc filter for filtration treatment to further purify the pulp to obtain pulp.
  • a dry-process waste paper pulping method the steps of which include:
  • step (3) The waste paper after being shredded in step (2) is first screened out by magnetic separation, and then the twin-screw extruding and decompressing machine is used to realize kneading and dividing, fully decompressing the waste paper fibers, and separating impurities and fibers to the maximum extent. Dissociate the fibers originally woven into paper sheets into single fibers to the greatest extent and maintain the original shape and strength of the fibers to the greatest extent. At the same time, water is added during the process of kneading and splitting, and the amount of water added is 10% of the amount of waste paper. Slurry was prepared.
  • step (3) (4) sending the slurry of step (3) into a multi-disc filter for filtration treatment to further purify the slurry;
  • step (4) The slurry treated in step (4) is subjected to thermal dispersion treatment, so that the sticky substance adhering to the fiber is peeled off from the fiber.
  • the heating method of the thermal dispersion treatment adopts steam to heat the slurry. The temperature was 100°C, and pulp was obtained.
  • a dry-process waste paper pulping method the steps of which include:
  • step (3) The waste paper shredded in step (2) is firstly screened for metals by magnetic separation, and then a twin-screw extruding and decompressing machine is used to realize kneading and dividing, fully decompressing waste paper fibers, and separating impurities and fibers to the greatest extent. Dissociate the fibers originally woven into paper sheets into single fibers to the greatest extent and maintain the original shape and strength of the fibers to the greatest extent. At the same time, water is added during the process of kneading and splitting, and the amount of water added is 10% of the amount of waste paper. Slurry was prepared.
  • step (3) The slurry of step (3) is sent to the high-concentration slag remover, and then the pulp screen is used to first carry out a pressure coarse screen to remove impurities (plastic particles, foam, knots, shredded paper, plastic sheets, adhesive materials and fiber bundles and other sundries), the pressure can be set according to needs, after the pressure coarse screen treatment, it enters the fiber grading screen to separate the long fibers and short fibers in the slurry;
  • step (4) sending the slurry treated in step (4) into a multi-disc filter for filtration treatment to further purify the slurry;
  • step (5) The slurry treated in step (5) is subjected to thermal dispersion treatment, so that the sticky substance adhering to the fiber is peeled off from the fiber.
  • the heating method of the thermal dispersion treatment adopts steam to heat the slurry. The temperature was 100°C, and pulp was obtained.
  • a dry-process waste paper pulping method the steps of which include:
  • step (3) The waste paper after being shredded in step (2) is first screened out by magnetic separation, and then the twin-screw extruding and decompressing machine is used to realize kneading and dividing, fully decompressing the waste paper fibers, and separating impurities and fibers to the maximum extent. Dissociate the fibers originally woven into paper sheets into single fibers to the greatest extent and maintain the original shape and strength of the fibers to the greatest extent. At the same time, water is added during the process of kneading and splitting, and the amount of water added is 20% of the amount of waste paper. Slurry was prepared.
  • step (3) The slurry of step (3) is sent to the high-concentration slag remover, and then the pulp screen is used to first carry out a pressure coarse screen to remove impurities (plastic particles, foam, knots, shredded paper, plastic sheets, adhesive materials and fiber bundles and other sundries), the pressure can be set according to the needs, after the pressure coarse screen treatment, it enters the fiber classification screen to separate the long fibers and short fibers in the slurry;
  • step (4) sending the slurry treated in step (4) into a multi-disc filter for filtration treatment to further purify the slurry;
  • step (5) The slurry treated in step (5) is subjected to thermal dispersion treatment, so that the sticky substance adhering to the fiber is peeled off from the fiber.
  • the heating method of the thermal dispersion treatment adopts steam to heat the slurry. The temperature was 105°C, and pulp was obtained.
  • Example 5 It can be seen from Examples 1-5 that the dry pulp obtained in Example 5 has better properties, and the fiber aspect ratio is 62.5.
  • the beating degree is 45°SR
  • the tensile index of the pulp is 15.5-29.0 N ⁇ m/g
  • the bursting index is 1.8-2.6 kPa ⁇ m 2 /g
  • the brightness is 60-75% ISO.
  • the dry treatment of the above technical scheme can improve the tensile index of pulp by 4-8%.
  • the dry pulping method of the present application can obtain dry pulp with good quality, and the amount of water can be reduced in the preparation process, the use of disintegration aids can be avoided, and the disintegration time can be prevented from making ink. Or the re-adhesion and redeposition of pigments to fibers, reducing production costs, environmental pollution and energy consumption.
  • the effect of kneading and splitting can be improved by setting different diameters of the spiral outlet grooves.
  • Example 6-8 The pulp obtained in Example 6-8 is tested for performance, and the obtained pulp quality index is as follows:
  • the tensile index of pulp is 19.3 ⁇ 30.5N ⁇ m/g; the bursting index is
  • the beating degree is 45°SR
  • the tensile index of the pulp is 20.3-32.0 N ⁇ m/g
  • the bursting index is 2.0-2.9 kPa ⁇ m 2 /g
  • the brightness is 60-80% ISO.
  • the dry treatment of the above technical scheme can improve the tensile index of pulp by 5-10%.
  • pressure coarse screen, disc filter treatment and thermal dispersion treatment can further improve the pulp tensile index and burst resistance index, so that better quality pulp can be obtained.

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Abstract

一种干法废纸浆及其制备方法，其步骤包括：(1)将打好包的废纸散开，对夹杂在废纸中的轻重杂质进行干法筛选去除；(2)将步骤(1)筛选后的废纸进行除铁；(3)将步骤(2)处理后的废纸进行撕碎；(4)将步骤(3)撕碎后的废纸进行磁选，然后进行揉搓分丝，且在揉搓分丝的过程中加水，制得干纸浆；(5)将步骤(4)的干纸浆进行挤压打包。本申请的干法废纸浆的制备方法能减少水的用量，避免使用碎解助剂，能防止因碎解时间长使得油墨或颜料再粘附和再沉积到纤维上导致纸浆质量下降的情形，能降低生产成本、环境污染和能耗，及提高纸浆的质量。

Description

一种干法废纸浆及其制备方法 技术领域
本申请涉及废纸处理技术领域，具体涉及一种干法废纸浆及其制备方法。
背景技术
利用废纸作为造纸原料，不但可以缓解造纸原料的匮乏和能源消耗的矛盾，符合可持续发展理念，而且可减轻日益严重的环境污染问题；与直接使用商品浆板相比，还可有效降低成本。
目前，废纸处理工艺主要由碎解系统、筛选系统、纤维分级筛、多圆盘浓缩和盘式热分散系统组成。废纸碎解是废纸制浆系统中最关键的一步，因为碎解的结果主要影响废纸的纤维分散、油墨从纤维上剥离和再沉积以及胶粘物等污染物与纤维的分离和再粘结。。当前，废纸碎解主要是利用水力碎浆机(卧式转鼓式高浓连续碎解机和立式高浓间歇式碎解机)在一定的碎解条件下对废纸进行碎解。该工艺需要消耗大量的水和碎解助剂(碎解助剂是添加到碎浆系统中，使纤维产生润湿、渗透和分散等多种作用效果以辅助废纸碎解的一种化学助剂，不仅污染环境也增加能耗。)来润湿、渗透和分散纤维，造成成本较高、能耗较大；转鼓式高浓连续碎解机碎解时间长，不能调节，碎解虽较缓和，但因碎解时间长，会增加油墨或颜料的再粘附和再沉积到纤维上，纸浆质量不好。
因此，有必要提供一种干法废纸浆及其制备方法以解决上述问题。
申请内容
本申请的目的之一是提供一种干法废纸浆的制备方法，制备过程中能减少水的用量，避免使用碎解助剂，且能防止因碎解时间长使得油墨或颜料再粘附和再沉积到纤维上导致纸浆质量下降的情形，能够降低生产成本、环境污染和 能耗，及提高纸浆的质量。
本申请的目的之二是提供一种采用上述制备方法制得的干法废纸浆。
为了实现上述目的，本申请提供了一种干法废纸浆的制备方法，其步骤包括：
(1)将打好包的废纸散开，对夹杂在废纸中的轻重杂质进行干法筛选去除；
(2)将步骤(1)筛选后的废纸进行除铁；
(3)将步骤(2)处理后的废纸进行撕碎；
(4)将步骤(3)撕碎后的废纸进行磁选，然后进行揉搓分丝，且在揉搓分丝的过程中加水，制得干纸浆；
(5)将步骤(4)的干纸浆进行挤压打包。
与现有技术相比，本申请提供的干法废纸浆的制备方法，通过干法筛选去除夹杂在废纸中的轻重杂质，降低设备磨损，提高成浆品质；然后对废纸进行除铁，去除废纸中的铁丝或铁块等金属类物质，避免进入后续设备中损坏设备和造纸不必要的停机，从而影响生产效率和产能；借助将废纸撕碎以便于磁选充分筛选出金属，避免对后续设备及纸浆质量的影响；磁选工艺是在废纸撕碎后进一步对废纸片中的金属(如铁)进行去除，以保证揉搓分丝的效果；尤其是通过揉搓分丝充分疏解废纸纤维，最大限度地使杂质和纤维分离，使原先交织成纸页的纤维最大限度地离解成单根纤维而又最大限度地保持纤维的原有形态和强度，能减少水的用量，且无需采用碎解助剂，还能防止因碎解时间长使得油墨或颜料的再粘附和再沉积到纤维上的情形，既能降低生产成本、环境污染和能耗，又能提高纸浆的质量。
较佳者，步骤(3)中，废纸被撕碎为30～50mm的废纸片，将废纸撕碎均匀，更有利于后续磁选。
较佳者，步骤(4)中，揉搓分丝采用双螺杆挤压疏解机实现。
较佳者，双螺杆挤压疏解机具有两螺杆，每个所述螺杆上设有至少一组螺旋件，所述螺旋件上设有螺旋出口槽，所述螺旋出口槽的口径为8～34mm和15～50mm。
较佳者，加水量为废纸重量的10％～30％。
较佳者，螺杆沿挤出方向间隔设置多组螺旋件，每组螺旋件上均设有螺旋出口槽，且螺旋出口槽的口径不变或逐渐降低。
较佳者，螺杆沿挤出方向间隔设置三组螺旋件，分别为第一组螺旋件、第二组螺旋件和第三组螺旋件，分别对应设于第一螺旋出口槽、第二螺旋出口槽和第三螺旋出口槽，第一螺旋出口槽的口径、第二螺旋出口槽的口径和第三螺旋出口槽的口径分别为24mm、22mm和20mm。
较佳者，在揉搓分丝的过程中加入碱，且碱的添加量小于或等于废纸重量的1％。碱可以为但不限于氢氧化钠、氢氧化钾。
较佳者，在揉搓分丝的过程中添加水的含量为废纸重量的30％，添加碱的含量为废纸重量的1％。
较佳者，对步骤(5)打包后的纸浆进行以下步骤：
(6)先进行压力粗筛以除去杂质，然后进入纤维分级筛以将浆料中的长纤维和短纤维分开；
(7)将步骤(6)处理后的浆料送入多圆盘过滤机进行处理；
(8)将步骤(7)处理后的浆料进行热分散处理，制得纸浆。
采用步骤(1)-(5)对废纸进行简单处理得到粗纸浆，然后再通过步骤(6)-(8)对粗纸浆进一步处理得到精细纸浆，借助压力粗筛以除去浆料中的杂质，然后进入纤维分级筛以将浆料中的长纤维和短纤维分开，节约能耗，提高纸浆的质量，能合理使用分级处理后的各纤维组分；借助多圆盘过滤机能有效地降低浆料的水耗；通过热分散处理使粘附在纤维上的胶粘物从纤维上剥离，提高纸浆的品质。
较佳者，步骤(6)中，压力粗筛先进行孔筛，然后进行缝筛，且孔筛的尺寸大于缝筛的尺寸。
较佳者，步骤(7)中，热分散处理的加热方式采用蒸汽对浆料加热。
较佳者，步骤(7)中，热分散处理的温度为100-105℃。
相应地，本申请还提供一种干法废纸浆的制备方法，其步骤包括：
(1)将打好包的废纸散开，对夹杂在废纸中的轻重杂质进行干法筛选去除；
(2)将步骤(1)筛选后的废纸进行除铁；
(3)将步骤(2)处理后的废纸进行撕碎；
(4)将步骤(3)撕碎后的废纸进行磁选，然后进行揉搓分丝，且在揉搓分丝的过程中加水，制得干纸浆；
(5)先进行压力粗筛以除去杂质，然后进入纤维分级筛以将浆料中的长纤维和短纤维分开；
(6)将步骤(5)处理后的浆料送入多圆盘过滤机进行处理；
(7)将步骤(6)处理后的浆料进行热分散处理，制得纸浆。
相应地，本申请还提供一种干法废纸浆的制备方法，其步骤包括：
(1)将打好包的废纸散开，对夹杂在废纸中的轻重杂质进行干法筛选去除；
(2)将步骤(1)筛选后的废纸撕碎；
(3)将步骤(2)撕碎后的废纸进行磁选，然后进行揉搓分丝，且在揉搓分丝的过程中加水，制得浆料；
(4)将步骤(3)的浆料，先进行压力粗筛以除去杂质，然后进入纤维分级筛以将浆料中的长纤维和短纤维分开；
(5)将步骤(4)处理后的浆料送入多圆盘过滤机进行处理；
(6)将步骤(5)处理后的浆料进行热分散处理，制得纸浆。
相应地，本申请还提供一种干法废纸浆，采用上述的干法废纸浆的制备方法制得。
附图说明
图1为本申请干法废纸浆的制备方法中螺杆的结构示意图。
具体实施方式
下面通过具体实施方式来进一步说明本申请的技术方案，但不构成对本申请的任何限制。
本申请提供一种干法废纸浆的制备方法，其步骤包括：
(1)将打好包的废纸散开，对夹杂在废纸中的轻重杂质进行干法筛选去除；
(2)将步骤(1)筛选后的废纸进行除铁；
(3)将步骤(2)处理后的废纸进行撕碎；
(4)将步骤(3)撕碎后的废纸进行磁选，然后进行揉搓分丝，且在揉搓分丝的过程中加水，制得干纸浆；
(5)将步骤(4)的干纸浆进行挤压打包。
其中，步骤(1)中，采用干法筛选去除夹杂在废纸中的轻重杂质(如玻璃、铁钉、沙石等)，降低设备磨损，提高成浆品质。
步骤(2)中，采用废纸除铁设备去除废纸中的铁丝或铁块等金属类物质，避免进入后续设备中损坏设备和造纸不必要的停机，从而影响生产效率和产能。
步骤(3)中，利用撕碎机把废纸撕碎成尺寸大小均匀的废纸片，废纸片的长宽尺寸均为30～50mm。
步骤(4)中，先通过磁选筛选出金属，如采用磁力吸出金属铁、不锈钢。然后采用双螺杆挤压疏解机实现揉搓分丝，充分疏解废纸纤维，最大限度地使杂质和纤维分离，使原先交织成纸页的纤维最大限度地离解成单根纤维而又最大限度地保持纤维的原有形态和强度，同时在揉搓分丝的过程中加水，加水量为废纸量的10％～30％，还可加入稀碱(一般采用浓度小于0.1mol/L，pH值大于7的溶液)，加碱量小于或等于废纸重量的1％，进一步保护纤维。借助揉搓分丝能减少水的用量，且无需采用碎解助剂，还能防止因碎解时间长使得油墨或颜料的再粘附和再沉积到纤维上导致纸浆质量差的情形。
进一步，请参考图1，双螺杆挤压疏解机具有两螺杆100，每个螺杆100上设有至少一组螺旋件101，螺旋件上设有螺旋出口槽103，螺旋出口槽103的口径为8～34mm和15～50mm。纸浆在螺杆100的作用下揉搓分丝，借助螺旋出口槽103实现分丝。更进一步，螺杆100沿挤出方向K间隔设置多组螺旋件101，每组螺旋件上均设有螺旋出口槽103，且螺旋出口槽103的口径不变或逐渐降低。通过设置多组螺旋件101及螺旋出口槽103，且螺旋出口槽103的口径不变或逐渐降低，可有效提高揉搓分丝的效果，进一步疏解废纸纤维。需要说明的是，图1仅给出了1个螺杆100的结构示意图，另一螺杆与该螺杆100结构相同，并列设置称为双螺杆。
具体地，螺杆100沿挤出方向K间隔设置三组螺旋件101，分别为第一组 螺旋件10、第二组螺旋件20和第三组螺旋件30，分别对应设于第一螺旋出口槽11、第二螺旋出口槽21和第三螺旋出口槽31，第一螺旋出口槽11的口径、第二螺旋出口槽21的口径和第三螺旋出口槽31的口径分别为24mm、22mm和20mm。优选方案中，在揉搓分丝过程中的加水量为废纸重量的30％，加稀碱量为废纸重量的1％，得到的纤维质量好。
步骤(5)中，干纸浆被运输到打包机里进行挤压打包，打包压力为300tons，打包尺寸为W1100×H1100×L(500～1800)mm。打包完后进入包装系统，用牛皮纸进行外包装后用铁丝固定后入库或装车运输。
若需进一步提高步骤(5)得到的纸浆的质量，对步骤(5)打包后的纸浆进行以下步骤：
(6)先进行压力粗筛以除去杂质，然后进入纤维分级筛以将浆料中的长纤维和短纤维分开；
(7)将步骤(6)处理后的浆料送入多圆盘过滤机进行处理；
(8)将步骤(7)处理后的浆料进行热分散处理，制得纸浆。
对于步骤(6)中，采用筛浆机先进行压力粗筛以除去杂质，压力粗筛通过压力粗筛设备进行。采用压力粗筛能够去除浆料悬浮液中的塑料颗粒、泡沫、绳结、碎纸片、塑料片、胶粘物及纤维束等杂物，从而为纤维分级筛提供了便利及效率。进一步，压力粗筛先进行孔筛，然后进行缝筛，且孔筛的尺寸大于缝筛的尺寸。孔筛用以除去浆料中较重、较大的废杂质，同时还能保护缝筛避免遭损伤，缝筛用来去除原生胶粘物等细小废杂质，提高去除杂质的效率。进一步，先通过高浓除渣器除去纸浆中较多的金属、沙子等重杂质，再采用压力粗筛。
对于步骤(7)中，浆料进入多圆盘过滤机，于多圆盘过滤机进行过滤以净化浆料。
对于步骤(8)中，通过热分散处理使粘附在纤维上的胶粘物从纤维上剥离，热分散处理的加热方式采用蒸汽对浆料加热，以提高分散效果。具体地，浆料在加热器内与通入的蒸汽均匀快速混合并被预热到85～105℃的温度，加热后的浆料经进料螺旋强制进入盘式热分散机后，在离心力的作用下，浆料依次从两 个盘片之间通过，两盘片的间隙为0.3～0.5mm。在预热的温度条件下使浆料中残存的筛选、净化、浮选等工序中无法除去、但肉眼可见的细小胶粘物、油墨、蜡等物质软化，再依靠纤维之间的摩擦作用、纤维与分散齿之间的机械作用，使之细化，并将肉眼不见的尘埃点分散到浆料里。进一步，热分散处理的温度为100-105℃。
下面通过具体实施例来阐述本申请的干法处理废纸制浆方法。
实施例1
一种干法废纸浆的制备方法，其步骤包括：
(1)把打包密实的废纸散开成片状，采用干法筛选去除夹杂在废纸中的轻重杂质(如玻璃、铁钉、沙石等)；
(2)采用废纸除铁设备去除废纸中的铁丝或铁块等金属类物质；
(3)利用撕碎机把废纸撕碎成尺寸大小均匀的废纸片，废纸片的长宽尺寸各为30mm；
(4)将步骤(3)撕碎后的废纸先通过磁选筛选出金属(如铁、不锈钢)，然后采用双螺杆挤压疏解机实现揉搓分丝，同时在揉搓分丝的过程中加水，制得干纸浆。其中，在双螺杆挤压疏解机内的加水量为废纸重量的20％，且螺杆沿挤出方向间隔设置三组螺旋件，分别为第一组螺旋件、第二组螺旋件和第三组螺旋件，分别对应设于第一螺旋出口槽、第二螺旋出口槽和第三螺旋出口槽，第一螺旋出口槽的口径、第二螺旋出口槽的口径和第三螺旋出口槽的口径分别为24mm、22mm和20mm；
制得的干纸浆纤维长度为1.65mm，纤维宽度为28.6μm，纤维长宽比为57.7。
(5)干纸浆被运输到打包机里进行挤压打包，打包压力为300tons，打包尺寸为W1100×H1100×L(500～1800)mm，打包完后进入包装系统，用牛皮纸进行外包装后用铁丝固定后入库或装车运输。
实施例2
一种干法废纸浆的制备方法，其步骤包括：
(1)把打包密实的废纸散开成片状，采用干法筛选去除夹杂在废纸中的轻重杂质(如玻璃、铁钉、沙石等)；
(2)采用废纸除铁设备去除废纸中的铁丝或铁块等金属类物质；
(3)利用撕碎机把废纸撕碎成尺寸大小均匀的废纸片，废纸片的尺寸为30mm；
(4)将步骤(3)撕碎后的废纸先通过磁选筛选出金属，然后采用双螺杆挤压疏解机实现揉搓分丝，同时在揉搓分丝的过程中加水，制得干纸浆。其中，加水量为废纸重量的10％，且螺杆沿挤出方向间隔设置三组螺旋件，分别为第一组螺旋件、第二组螺旋件和第三组螺旋件，分别对应设于第一螺旋出口槽、第二螺旋出口槽和第三螺旋出口槽，第一螺旋出口槽的口径、第二螺旋出口槽的口径和第三螺旋出口槽的口径分别为24mm、22mm和20mm；
制得的干纸浆纤维长度为1.54mm，纤维宽度为29.5μm，纤维长宽比为52.3。
(5)干纸浆被运输到打包机里进行挤压打包，打包压力为300tons，打包尺寸为W1100×H1100×L(500～1800)mm。打包完后进入包装系统，用牛皮纸进行外包装后用铁丝固定后入库或装车运输。
实施例3
一种干法废纸浆的制备方法，其步骤包括：
(1)把打包密实的废纸散开成片状，采用干法筛选去除夹杂在废纸中的轻重杂质(如玻璃、铁钉、沙石等)；
(2)采用废纸除铁设备去除废纸中的铁丝或铁块等金属类物质；
(3)利用撕碎机把废纸撕碎成尺寸大小均匀的废纸片，废纸片的尺寸为50mm；
(4)将步骤(3)撕碎后的废纸先通过磁选筛选出金属，然后采用双螺杆挤压疏解机实现揉搓分丝，同时在揉搓分丝的过程中加水，制得干纸浆。其中，加水量为废纸重量的20％，且螺杆沿挤出方向间隔设置三组螺旋件，分别为第一组螺旋件、第二组螺旋件和第三组螺旋件，分别对应设于第一螺旋出口槽、第二螺旋出口槽和第三螺旋出口槽，第一螺旋出口槽的口径、第二螺旋出口槽 的口径和第三螺旋出口槽的口径分别为18mm、18mm和16mm；
制得的干纸浆纤维长度为1.55mm，纤维宽度为29.6μm、纤维长宽比为52。
(5)干纸浆被运输到打包机里进行挤压打包，打包压力为300tons，打包尺寸为W1100×H1100×L(500～1800)mm。打包完后进入包装系统，用牛皮纸进行外包装后用铁丝固定后入库或装车运输。
实施例4
一种干法废纸浆的制备方法，其步骤包括：
(1)把打包密实的废纸散开成片状，采用干法筛选去除夹杂在废纸中的轻重杂质(如玻璃、铁钉、沙石等)；
(2)采用废纸除铁设备去除废纸中的铁丝或铁块等金属类物质；
(3)利用撕碎机把废纸撕碎成尺寸大小均匀的废纸片，废纸片的尺寸为30mm；
(4)将步骤(3)撕碎后的废纸先通过磁选筛选出金属，然后采用双螺杆挤压疏解机实现揉搓分丝，同时在揉搓分丝的过程中加水，制得干纸浆。其中，加水量为废纸重量的30％，且螺杆沿挤出方向间隔设置三组螺旋件，分别为第一组螺旋件、第二组螺旋件和第三组螺旋件，分别对应设于第一螺旋出口槽、第二螺旋出口槽和第三螺旋出口槽，第一螺旋出口槽的口径、第二螺旋出口槽的口径和第三螺旋出口槽的口径分别为24mm、22mm和20mm；
制得的干纸浆纤维长度为1.70mm，纤维宽度为28.2μm、纤维长宽比为60.2。
(5)干纸浆被运输到打包机里进行挤压打包，打包压力为300tons，打包尺寸为W1100×H1100×L(500～1800)mm。打包完后进入包装系统，用牛皮纸进行外包装后用铁丝固定后入库或装车运输。
实施例5
一种干法废纸浆的制备方法，其步骤包括：
(1)把打包密实的废纸散开成片状，采用干法筛选去除夹杂在废纸中的轻重杂质(如玻璃、铁钉、沙石等)；
(2)采用废纸除铁设备去除废纸中的铁丝或铁块等金属类物质；
(3)利用撕碎机把废纸撕碎成尺寸大小均匀的废纸片，废纸片的尺寸为30mm；
(4)将步骤(3)撕碎后的废纸先通过磁选筛选出金属，然后采用双螺杆挤压疏解机实现揉搓分丝，同时在揉搓分丝的过程中加水和稀碱，制得干纸浆。其中，加水量为废纸重量的30％，机内加入稀碱量为废纸重量的1％，且螺杆沿挤出方向间隔设置三组螺旋件，分别为第一组螺旋件、第二组螺旋件和第三组螺旋件，分别对应设于第一螺旋出口槽、第二螺旋出口槽和第三螺旋出口槽，第一螺旋出口槽的口径、第二螺旋出口槽的口径和第三螺旋出口槽的口径分别为24mm、22mm和20mm；
制得的干纸浆纤维长度为1.75mm，纤维宽度为28.0μm、纤维长宽比为62.5。
(5)干纸浆被运输到打包机里进行挤压打包，打包压力为300tons，打包尺寸为W1100×H1100×L(500～1800)mm。打包完后进入包装系统，用牛皮纸进行外包装后用铁丝固定后入库或装车运输。
实施例6
一种干法处理废纸制浆方法，其步骤包括：
(1)把打包密实的废纸散开成片状，采用干法筛选去除夹杂在废纸中的轻重杂质(如玻璃、铁钉、沙石等)；
(2)利用撕碎机把废纸撕碎成尺寸大小均匀的废纸片，废纸片的尺寸为30mm；
(3)将步骤(2)撕碎后的废纸先通过磁选筛选出金属，然后采用双螺杆挤压疏解机实现揉搓分丝，充分疏解废纸纤维，最大限度地使杂质和纤维分离，使原先交织成纸页的纤维最大限度地离解成单根纤维而又最大限度地保持纤维的原有形态和强度，同时在揉搓分丝的过程中加水，加水量为废纸量的10％，制得浆料。
(4)将步骤(3)的浆料送入高浓除渣器，然后采用筛浆机先进行压力粗筛以除去杂质(塑料颗粒、泡沫、绳结、碎纸片、塑料片、胶粘物及纤维束等 杂物)，压力可根据需要设定，压力粗筛处理后进入纤维分级筛以将浆料中的长纤维和短纤维分开，制得纸浆。
实施例7
一种干法处理废纸制浆方法，其步骤包括：
(1)把打包密实的废纸散开成片状，采用干法筛选去除夹杂在废纸中的轻重杂质(如玻璃、铁钉、沙石等)；
(2)利用撕碎机把废纸撕碎成尺寸大小均匀的废纸片，废纸片的尺寸为30mm；
(3)将步骤(2)撕碎后的废纸先通过磁选筛选出金属，然后采用双螺杆挤压疏解机实现揉搓分丝，充分疏解废纸纤维，最大限度地使杂质和纤维分离，使原先交织成纸页的纤维最大限度地离解成单根纤维而又最大限度地保持纤维的原有形态和强度，同时在揉搓分丝的过程中加水，加水量为废纸量的10％，制得浆料。
(4)将步骤(3)的浆料送入高浓除渣器，然后采用筛浆机先进行压力粗筛以除去杂质(塑料颗粒、泡沫、绳结、碎纸片、塑料片、胶粘物及纤维束等杂物)，压力可根据需要设定，压力粗筛处理后进入纤维分级筛以将浆料中的长纤维和短纤维分开；
(5)将步骤(4)处理后的浆料送入多圆盘过滤机进行过滤处理进一步净化浆料，制得纸浆。
实施例8
一种干法处理废纸制浆方法，其步骤包括：
(1)把打包密实的废纸散开成片状，采用干法筛选去除夹杂在废纸中的轻重杂质(如玻璃、铁钉、沙石等)；
(2)利用撕碎机把废纸撕碎成尺寸大小均匀的废纸片，废纸片的尺寸为30mm；
(3)将步骤(2)撕碎后的废纸先通过磁选筛选出金属，然后采用双螺杆 挤压疏解机实现揉搓分丝，充分疏解废纸纤维，最大限度地使杂质和纤维分离，使原先交织成纸页的纤维最大限度地离解成单根纤维而又最大限度地保持纤维的原有形态和强度，同时在揉搓分丝的过程中加水，加水量为废纸量的10％，制得浆料。
(4)将步骤(3)的浆料送入多圆盘过滤机进行过滤处理进一步净化浆料；
(5)将步骤(4)处理后的浆料通过热分散处理，使粘附在纤维上的胶粘物从纤维上剥离，热分散处理的加热方式采用蒸汽对浆料加热，热分散处理的温度为100℃，制得纸浆。
实施例9
一种干法处理废纸制浆方法，其步骤包括：
(1)把打包密实的废纸散开成片状，采用干法筛选去除夹杂在废纸中的轻重杂质(如玻璃、铁钉、沙石等)；
(2)利用撕碎机把废纸撕碎成尺寸大小均匀的废纸片，废纸片的尺寸为30mm；
(3)将步骤(2)撕碎后的废纸先通过磁选筛选出金属，然后采用双螺杆挤压疏解机实现揉搓分丝，充分疏解废纸纤维，最大限度地使杂质和纤维分离，使原先交织成纸页的纤维最大限度地离解成单根纤维而又最大限度地保持纤维的原有形态和强度，同时在揉搓分丝的过程中加水，加水量为废纸量的10％，制得浆料。
(4)将步骤(3)的浆料送入高浓除渣器，然后采用筛浆机先进行压力粗筛以除去杂质(塑料颗粒、泡沫、绳结、碎纸片、塑料片、胶粘物及纤维束等杂物)，压力可根据需要设定，压力粗筛处理后进入纤维分级筛以将浆料中的长纤维和短纤维分开；
(5)将步骤(4)处理后的浆料送入多圆盘过滤机进行过滤处理进一步净化浆料；
(6)将步骤(5)处理后的浆料通过热分散处理，使粘附在纤维上的胶粘物从纤维上剥离，热分散处理的加热方式采用蒸汽对浆料加热，热分散处理的 温度为100℃，制得纸浆。
实施例10
一种干法处理废纸制浆方法，其步骤包括：
(1)把打包密实的废纸散开成片状，采用干法筛选去除夹杂在废纸中的轻重杂质(如玻璃、铁钉、沙石等)；
(2)利用撕碎机把废纸撕碎成尺寸大小均匀的废纸片，废纸片的尺寸为50mm；
(3)将步骤(2)撕碎后的废纸先通过磁选筛选出金属，然后采用双螺杆挤压疏解机实现揉搓分丝，充分疏解废纸纤维，最大限度地使杂质和纤维分离，使原先交织成纸页的纤维最大限度地离解成单根纤维而又最大限度地保持纤维的原有形态和强度，同时在揉搓分丝的过程中加水，加水量为废纸量的20％，制得浆料。
(4)将步骤(3)的浆料送入高浓除渣器，然后采用筛浆机先进行压力粗筛以除去杂质(塑料颗粒、泡沫、绳结、碎纸片、塑料片、胶粘物及纤维束等杂物)，压力可根据需要设定，压力粗筛处理后进入纤维分级筛以将浆料中的长纤维和短纤维分开；
(5)将步骤(4)处理后的浆料送入多圆盘过滤机进行过滤处理进一步净化浆料；
(6)将步骤(5)处理后的浆料通过热分散处理，使粘附在纤维上的胶粘物从纤维上剥离，热分散处理的加热方式采用蒸汽对浆料加热，热分散处理的温度为105℃，制得纸浆。
由实施例1-5可知，实施例5得到的干纸浆性能较好，纤维长宽比为62.5。
对实施例1-5制得的干纸浆进行性能检测，所制得的纸浆质量指标如下：
打浆度为45°SR时，纸浆抗张指数为15.5～29.0N·m/g；耐破指数为1.8～2.6kPa·m 2/g；亮度为60～75％ISO。
其中，上述技术方案的干法处理可以提高纸浆抗张指数4～8％。
可见，通过本申请的干法处理废纸制浆方法可以制得具有优良质量的干纸 浆，且制备过程中能减少水的用量，避免使用碎解助剂，且能防止碎解时间长使得油墨或颜料的再粘附和再沉积到纤维上的情形，降低生产成本、环境污染和能耗。尤其是通过不同的螺旋出口槽的口径设置，能提高揉搓分丝的效果。
对实施例6-8制得的纸浆进行性能检测，所制得的纸浆质量指标如下：
打浆度为45°SR时，纸浆抗张指数为19.3～30.5N·m/g；耐破指数为
1.9～2.75kPa·m 2/g；亮度为60～78％ISO。
对实施例9-10制得的纸浆进行性能检测，所制得的纸浆质量指标如下：
打浆度为45°SR时，纸浆抗张指数为20.3～32.0N·m/g；耐破指数为2.0～2.9kPa·m 2/g；亮度为60～80％ISO。
其中，上述技术方案的干法处理可以提高纸浆抗张指数5～10％。
可见，添加压力粗筛、圆盘过滤机处理及热分散处理能够进一步提高纸浆抗张指数及耐破指数，从而能获得质量更优的纸浆。
最后所应当说明的是，以上实施例仅用以说明本申请的技术方案而非对本申请保护范围的限制，尽管参照最佳实施例对本申请做了详细的说明，但本申请并不局限于以上揭示的实施例，而应当涵盖各种根据本申请的本质进行的修改、等效组合。

Claims (16)

  1. 一种干法废纸浆的制备方法，其特征在于，其步骤包括：
    (1)将打好包的废纸散开，对夹杂在废纸中的轻重杂质进行干法筛选去除；
    (2)将步骤(1)筛选后的废纸进行除铁；
    (3)将步骤(2)处理后的废纸进行撕碎；
    (4)将步骤(3)撕碎后的废纸进行磁选，然后进行揉搓分丝，且在揉搓分丝的过程中加水，制得干纸浆；
    (5)将步骤(4)的干纸浆进行挤压打包。
  2. 如权利要求1所述的干法废纸浆的制备方法，其特征在于，步骤(3)中，废纸被撕碎为30～50mm的废纸片。
  3. 如权利要求1所述的干法废纸浆的制备方法，其特征在于，步骤(4)中，揉搓分丝采用双螺杆挤压疏解机实现。
  4. 如权利要求3所述的干法废纸浆的制备方法，其特征在于，双螺杆挤压疏解机具有两螺杆，每个所述螺杆上设有至少一组螺旋件，所述螺旋件上设有螺旋出口槽，所述螺旋出口槽的口径为8～34mm。
  5. 如权利要求4所述的干法废纸浆的制备方法，其特征在于，加水量为废纸重量的10％～30％。
  6. 如权利要求5所述的干法废纸浆的制备方法，其特征在于，所述螺杆沿挤出方向间隔设置多组所述螺旋件，每组所述螺旋件上均设有所述螺旋出口槽，且所述螺旋出口槽的口径不变或逐渐降低。
  7. 如权利要求6所述的干法废纸浆的制备方法，其特征在于，所述螺杆沿挤出 方向间隔设置所述三组螺旋件，分别为第一组螺旋件、第二组螺旋件和第三组螺旋件，分别对应设于第一螺旋出口槽、第二螺旋出口槽和第三螺旋出口槽，所述第一螺旋出口槽的口径、所述第二螺旋出口槽的口径和所述第三螺旋出口槽的口径分别为24mm、22mm和20mm。
  8. 如权利要求7所述的干法废纸浆的制备方法，其特征在于，在揉搓分丝的过程中加入碱，且碱的添加量小于或等于废纸重量的1％。
  9. 如权利要求8所述的干法废纸浆的制备方法，其特征在于，在揉搓分丝的过程中添加水的含量为废纸重量的30％，添加稀碱的含量为废纸重量的1％。
  10. 如权利要求1所述的干法废纸浆的制备方法，其特征在于，对步骤(5)打包后的纸浆进行以下步骤：
    (6)先进行压力粗筛以除去杂质，然后进入纤维分级筛以将浆料中的长纤维和短纤维分开；
    (7)将步骤(6)处理后的浆料送入多圆盘过滤机进行处理；
    (8)将步骤(7)处理后的浆料进行热分散处理，制得纸浆。
  11. 如权利要求10所述的干法废纸浆的制备方法，其特征在于，步骤(6)中，压力粗筛先进行孔筛，然后进行缝筛，且孔筛的尺寸大于缝筛的尺寸。
  12. 如权利要求10所述的干法废纸浆的制备方法，其特征在于，步骤(7)中，热分散处理的加热方式采用蒸汽对浆料加热。
  13. 如权利要求10所述的干法废纸浆的制备方法，其特征在于，步骤(7)中，热分散处理的温度为100-105℃。
  14. 一种干法废纸浆的制备方法，其特征在于，其步骤包括：
    (1)将打好包的废纸散开，对夹杂在废纸中的轻重杂质进行干法筛选去除；
    (2)将步骤(1)筛选后的废纸进行除铁；
    (3)将步骤(2)处理后的废纸进行撕碎；
    (4)将步骤(3)撕碎后的废纸进行磁选，然后进行揉搓分丝，且在揉搓分丝的过程中加水，制得干纸浆；
    (5)先进行压力粗筛以除去杂质，然后进入纤维分级筛以将浆料中的长纤维和短纤维分开；
    (6)将步骤(5)处理后的浆料送入多圆盘过滤机进行处理；
    (7)将步骤(6)处理后的浆料进行热分散处理，制得纸浆。
  15. 一种干法废纸浆的制备方法，其特征在于，其步骤包括：
    (1)将打好包的废纸散开，对夹杂在废纸中的轻重杂质进行干法筛选去除；
    (2)将步骤(1)筛选后的废纸撕碎；
    (3)将步骤(2)撕碎后的废纸进行磁选，然后进行揉搓分丝，且在揉搓分丝的过程中加水，制得浆料；
    (4)将步骤(3)的浆料，先进行压力粗筛以除去杂质，然后进入纤维分级筛以将浆料中的长纤维和短纤维分开；
    (5)将步骤(4)处理后的浆料送入多圆盘过滤机进行处理；
    (6)将步骤(5)处理后的浆料进行热分散处理，制得纸浆。
  16. 一种干法废纸浆，其特征在于，采用如权利要求1-15任一项所述的干法废纸浆的制备方法制得。
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