WO2010106592A1 - 微細紙粉製造方法、微細紙粉含有樹脂組成物 - Google Patents
微細紙粉製造方法、微細紙粉含有樹脂組成物 Download PDFInfo
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- WO2010106592A1 WO2010106592A1 PCT/JP2009/005821 JP2009005821W WO2010106592A1 WO 2010106592 A1 WO2010106592 A1 WO 2010106592A1 JP 2009005821 W JP2009005821 W JP 2009005821W WO 2010106592 A1 WO2010106592 A1 WO 2010106592A1
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/004—Shape or construction of rollers or balls
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2311/00—Use of natural products or their composites, not provided for in groups B29K2201/00 - B29K2309/00, as reinforcement
- B29K2311/12—Paper, e.g. cardboard
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- 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 invention relates to a fine paper powder production method for producing fine paper powder, and a fine paper powder-containing resin composition containing the fine paper powder obtained by this production method.
- Paper is a functional material having a structure with high added value, which has been subjected to advanced processing that makes cellulose fibers fine and soft at the processing stage from wood or the like. Therefore, waste paper is originally a functional material having a structure with high added value, and in addition, it becomes a raw material with virtually no environmental impact. Thus, it has been proposed to use a paper-containing resin composition in which crushed waste paper is mixed in a resin as a material for molding.
- composite paper having polyethylene resin on both sides or one side is shredded into shredders such as a shredder or a crusher or a crusher into small pieces, granules, and powders of about 1 mm to 5 mm square,
- shredders such as a shredder or a crusher or a crusher into small pieces, granules, and powders of about 1 mm to 5 mm square
- a paper-containing resin composition in which a synthetic resin component such as polyethylene is mixed so that the shredded paper component is 50% by weight or more is disclosed.
- recovered waste paper such as laminated paper for liquid containers is pulverized to a particle size of 0.5 mm to 2.5 mm, and a resin such as polyethylene or polypropylene is mixed so that the pulverized paper is 51% by mass or more.
- a paper-containing resin composition is disclosed.
- a low-burning component mainly composed of powdered paper powder having a particle size of 50 ⁇ m or more and 200 ⁇ m or less by pulverizing waste paper or the like is more than 50% by weight and is mainly composed of a thermoplastic resin.
- a paper-containing resin composition for molding processing containing 30% by weight or more and less than 50% by weight of a high combustion component is disclosed.
- the paper-containing resin compositions disclosed in Patent Documents 1 and 2 contain shredded paper of about 1 mm to 5 mm square, crushed paper with a particle size of 0.5 mm to 2.5 mm, and large sized crushed paper. .
- shredded paper of about 1 mm to 5 mm square
- crushed paper with a particle size of 0.5 mm to 2.5 mm
- large sized crushed paper When such a resin composition is used for injection molding of a complicated molded product having a fine structure, pulverized paper that does not exhibit fluidity even when heated prevents the resin composition from flowing, resulting in defects such as poor filling. Since it is easy to occur and transferability is inferior, a high quality molded product cannot be obtained with a good yield.
- the particle size of the paper powder contained in the paper-containing resin composition is reduced to less than 50 ⁇ m by the inventors of the present invention, the transferability is excellent, and high-quality molded products can be injection-molded with high yield. all right.
- the average particle size is about 100 ⁇ m, and even if the operation of the pulverizer is continued, the paper fibers are intertwined. It turned out to be cottony and it was found that the pulverization did not proceed.
- the present invention provides a fine paper powder production method capable of producing fine paper powder having a particle size of less than 50 ⁇ m without imposing a large environmental load, and a molding containing fine paper powder obtained by this production method. It aims at providing the resin composition for a process.
- the coarsely pulverized paper powder is pulverized by using a first vertical roller mill having a plurality of first pulverizing rollers having grooves formed on the outer peripheral surface, and an average particle size of 50 ⁇ m.
- a second fine pulverization step for obtaining fine paper powder having an average particle size of 25 ⁇ m or more and less than 50 ⁇ m, and an inclination angle of the groove of the first pulverization roller with respect to the rotation shaft of the first pulverization roller.
- the inclination angle of the groove of the second crushing roller with respect to the rotation axis of the second crushing roller is smaller.
- the coarsely pulverized paper powder is pulverized to an average particle size of 50 ⁇ m or more and less than 150 ⁇ m using a first vertical roller mill.
- the groove formed on the outer peripheral surface of the first crushing roller of the first vertical roller mill has a small inclination angle with respect to the rotation axis of the first crushing roller. Therefore, the distance (time) in which paper dust is continuously bitten into the gap between the outer peripheral surface of the first crushing roller and the inner peripheral wall surface of the crushing chamber is short, and promotes the opening of the paper fiber entanglement structure.
- the crushing efficiency with an average particle size of 50 ⁇ m or more and less than 150 ⁇ m is excellent, and the environmental load is small.
- fine paper powder having an average particle size of 50 ⁇ m or more and less than 150 ⁇ m obtained in the first fine pulverization step is pulverized to an average particle size of 25 ⁇ m or more and less than 50 ⁇ m using a second vertical roller mill.
- the groove formed on the outer peripheral surface of the second crushing roller of the second vertical roller mill has a large inclination angle with respect to the rotation axis of the second crushing roller. Therefore, the paper fiber stays in the gap between the outer peripheral surface of the second pulverizing roller and the inner peripheral wall surface of the pulverizing chamber, and the distance (time) during which the paper powder stays is long. Therefore, the pulverization efficiency to an average particle size of 25 ⁇ m or more and less than 50 ⁇ m is excellent, and the environmental load is small.
- the inclination angle of the groove of the first grinding roller with respect to the rotation axis of the first grinding roller is 5 degrees or more and 45 degrees or less
- the rotation axis of the second grinding roller is It is preferable that the inclination angle of the groove of the second crushing roller is 45 degrees or more and 85 degrees or less.
- the bottoms of the grooves of the first pulverizing roller and the second pulverizing roller have an arc shape in a side view.
- the fine paper powder-containing resin composition of the present invention comprises a fine paper powder having an average particle size of 25 ⁇ m or more and less than 50 ⁇ m obtained by the fine paper powder production method of the present invention, wherein the weight ratio is in the range of 50 wt% to 60 wt%.
- At least one resin selected from polyethylene, polypropylene, olefin elastomer, polystyrene, acrylonitrile-styrene copolymer synthetic resin, acrylonitrile-butadiene-styrene copolymer synthetic resin, nylon, polybutylene terephthalate, and polyethylene terephthalate. It is obtained by mixing.
- the fine paper powder-containing resin composition of the present invention since it contains fine paper powder having an average particle size of 25 ⁇ m or more and less than 50 ⁇ m, transferability is excellent when molded using the fine paper powder-containing resin composition. High-quality molded products can be obtained with good yield.
- (A) is a side view showing a first crushing roller
- (b) is a side view showing a second crushing roller.
- This fine paper powder manufacturing method pulverizes waste paper as a raw material to fine paper powder having an average particle size of 25 ⁇ m or more and less than 50 ⁇ m, and has a coarse pulverization step and a fine pulverization step.
- Waste paper includes waste newspaper, magazine waste, printed waste paper, packaging waste paper, corrugated waste paper, OA waste paper and other waste paper, broken paper and waste paper generated during the manufacture of virgin paper, magazine waste, and abrasive powder. , Shredder scraps and the like. Waste paper is discharged in large quantities from offices, publishers, paper manufacturers, etc., and it is evaluated that the environmental impact is virtually zero.
- the average particle diameter of paper powder shall be measured with a laser diffraction type particle size distribution measuring apparatus (manufactured by Marvern Instruments Ltd., Mastersizer S type).
- the waste paper is pulverized into a piece of paper of about several mm to several tens cm, preferably 2 mm to 4 mm square, using a coarse pulverizer such as a roll crusher, a hammer mark lasher, or a cutter mill.
- a coarse pulverizer such as a roll crusher, a hammer mark lasher, or a cutter mill.
- a cutter or a cutting machine may be used as the coarse pulverizer.
- the waste paper is several mm or less, such as polishing powder obtained by polishing a book or shredder waste, a coarse pulverization step is not required.
- the fine pulverization step is a step of finely pulverizing the paper powder pulverized in the coarse pulverization step to obtain fine paper powder having an average particle size of 25 ⁇ m or more and less than 50 ⁇ m, and includes a first fine pulverization step and a second fine pulverization step.
- the fine pulverization step is performed using a fine pulverizer in which two vertical roller mills 10 and 20 are connected in series.
- the vertical roller mill represents a roller mill, and is a roller type pulverizer that is also simply called a “roller mill”.
- the coarse paper powder pulverized in the coarse pulverization step is finely pulverized to an average particle size of 50 ⁇ m or more and less than 150 ⁇ m using the first vertical roller mill 10.
- the paper powder pulverized in the coarse pulverization step is supplied into the pulverization chamber 11 of the first vertical roller mill 10.
- the paper dust is supplied into the crushing chamber (housing) 11 through the supply hopper (raw material supply port) 12 and the supply screw 13.
- paper dust may be quantitatively supplied to the supply hopper 12 using a rotary valve, a screw feeder, or the like.
- the first vertical roller mill 10 includes a rotary table 14 that is rotationally driven by a motor (not shown) in a cylindrical crushing chamber 11 and a gap in the rotational direction of the rotary table 14. And a plurality of bowl-shaped first crushing rollers 15 arranged.
- the first crushing roller 15 is a free roller configured so that a load is applied to the rotary table by hydraulic pressure, a spring, or the like, and rotates following the rotation of the rotary table 14. As the rotary table 14 rotates, the first crushing roller 15 is pressed against the inner peripheral wall surface side of the crushing chamber 11, and paper dust is caught between the land 15 b of the first crushing roller 15 and the inner peripheral wall surface of the crushing chamber 11. The paper dust is crushed.
- a spiral groove 15a is formed in the outer peripheral surface of the first crushing roller 15.
- the groove 15a is inclined with respect to the rotation axis L1 of the first crushing roller 15, and the inclination angle ⁇ 1 is preferably 5 degrees or more and 45 degrees or less, more preferably 5 degrees or more and 30 degrees or less, In this embodiment, it is 10 degrees.
- the groove 15a has a small inclination angle ⁇ 1 and is formed substantially in the vertical direction.
- the groove section of a normal crushing roller used when crushing foods and grains is trapezoidal in a side view and has a corner at the bottom.
- paper dust tends to adhere to the corners and accumulate, and clogging of grooves occurs immediately.
- the bottom of the groove 15a is formed in an arc shape when viewed from the side, and clogging of the groove is difficult to occur.
- the cross-sectional view of the groove 15a has a substantially U shape with a taper.
- the paper dust supplied into the crushing chamber 11 is moved to the outer periphery of the rotary table 14 by the centrifugal force of the rotary table 14, and is caught in the gap between the land 15 b of the first crushing roller 15 and the inner peripheral wall surface of the crushing chamber 11. Rarely crushed. Since the groove 15a with respect to the rotation axis L1 of the first crushing roller 15 has a small inclination angle ⁇ 1, the distance in which paper dust is continuously bitten into the gap between the outer peripheral surface of the first crushing roller 15 and the inner peripheral wall surface of the crushing chamber 11 (Time) is short, and the opening of the entangled structure of paper fibers is promoted. Therefore, the pulverization efficiency until the paper powder has an average particle size of 50 ⁇ m or more and less than 150 ⁇ m is excellent, and the environmental load is small.
- the 2 mm to 4 mm square coarse paper powder is finely pulverized by the first vertical roller mill 10 to an average particle size of 50 ⁇ m or more and less than 150 ⁇ m. Paper powder having a particle size of 150 ⁇ m or more is hit by a rotating blade, falls due to its own weight, and is pulverized again.
- the fine paper powder pulverized in the first pulverization step is pulverized to an average particle size of 25 ⁇ m or more and less than 50 ⁇ m using the second vertical roller mill 20.
- Coarse fine paper powder finely pulverized to an average particle size of 50 ⁇ m or more and less than 150 ⁇ m by the first vertical roller mill 10 is supplied from the supply pipe 17 into the pulverization chamber 21 of the second vertical roller mill 20.
- coarse fine paper powder is supplied from the supply pipe 17 into the pulverization chamber 21 through the dust collector 18, the rotary valve 19, a screw feeder (not shown), the supply hopper 22, and the supply screw 23.
- the configuration of the second vertical roller mill 20 is similar to that of the first vertical roller mill 10, and a rotary table 24 (not shown) that is driven to rotate by a motor (not shown) in the cylindrical grinding chamber 21, and this rotation And a plurality of bowl-shaped second crushing rollers 25 arranged with a gap in the rotation direction of the table 24.
- the inclination angle ⁇ 2 of the groove 25a formed in the second crushing roller 25 of the second saddle type roller mill 20 with respect to the rotation axis L2 of the second crushing roller 25 is the first vertical type.
- the inclination angle ⁇ 1 of the groove 15a formed in the first grinding roller 15 of the roller mill 10 with respect to the rotation axis L1 of the first grinding roller 15 is larger.
- the inclination angle ⁇ 2 of the groove 25a with respect to the rotation axis L2 of the second crushing roller 25 is preferably 45 degrees or more and 85 degrees or less, more preferably 50 degrees or more and 75 degrees or less, and in this embodiment, 60 degrees.
- the groove 25a has a large inclination angle ⁇ 2 and is formed substantially in the lateral direction.
- the difference between the inclination angle ⁇ 1 of the groove 15a and the inclination angle ⁇ 2 of the groove 25a is preferably 15 degrees to 75 degrees, more preferably 30 degrees to 60 degrees, and 50 degrees in this embodiment.
- the bottom of the groove 25a is formed in an arc shape in a side view, like the groove 15a.
- the cross-sectional view of the groove 25a is substantially U-shaped with a taper.
- the fine paper powder supplied into the crushing chamber 21 moves to the outer periphery of the rotary table 24 by the centrifugal force of the rotary table 24, and is bitten between the land 25b of the second crushing roller 25 and the inner peripheral wall surface of the crushing chamber 21. And crushed. Since the inclination angle ⁇ 2 of the groove 25a with respect to the rotation axis L2 of the second crushing roller 25 is large, the distance in which the paper dust stays in the gap between the outer peripheral surface of the second crushing roller 25 and the inner peripheral wall surface of the crushing chamber 21 (Time) is long, the fine paper powder is crushed, and the refinement of the opened paper fiber is promoted. Therefore, the paper powder has excellent pulverization efficiency with an average particle size of 25 ⁇ m or more and less than 50 ⁇ m, and the environmental load is small.
- fine fine paper powder having an average particle size of 25 ⁇ m or more and less than 50 ⁇ m is supplied through a classifier (rotary blade separator) (not shown) installed in the upper part 26 of the crushing chamber 21. It is discharged from a pipe (supply duct) 27.
- the coarse fine paper powder having an average particle size of 50 ⁇ m or more and less than 150 ⁇ m is finely pulverized by the second vertical roller mill 20 to an average particle size of 25 ⁇ m or more and less than 50 ⁇ m.
- Paper powder having a particle size of 50 ⁇ m or more is hit by a rotating blade, falls due to its own weight, and is pulverized again. Note that it is not preferable to finely pulverize to an average particle size of less than 25 ⁇ m because the environmental load required for fine pulverization increases and the advantage of using waste paper that has substantially no environmental load is reduced.
- Fine fine paper powder having an average particle size of 25 ⁇ m or more and less than 50 ⁇ m supplied to the supply pipe 27 is collected in a collection box 31 via a dust collector 28 and a rotary valve 29.
- a suspension member that rotates while supporting the upper portions of the grinding rollers 15 and 25 (suspending the grinding rollers) is used. Also good.
- grooves may be formed on the inner peripheral walls of the crushing chambers 11 and 21, but paper powder may accumulate in the concave grooves and the crushing effect may deteriorate, so the inner peripheral wall surface of the crushing chamber should be smoother. preferable.
- fine paper powder having an average particle size of 25 ⁇ m or more and less than 50 ⁇ m can be obtained with excellent pulverization efficiency, and the environmental load is small.
- the operating time, the rotation speed of the rotary table, the amount and ratio of fine fine paper powder to be input to the vertical roller mill 20, etc. are determined. Therefore, the operating conditions suitable for the required average particle size of fine paper powder, processing capacity, etc. may be determined as appropriate through experiments.
- the fine paper powder production method of the present invention is not limited to this embodiment.
- the case where the supply ports from the supply hoppers 12 and 22 to the crushing chambers 11 and 21 are provided on the side of the rotary table is illustrated, but any or all of these supply ports are illustrated. May be provided above the rotary table.
- This resin composition containing fine paper powder is such that the weight ratio of fine paper powder having an average particle size of 25 ⁇ m or more and less than 50 ⁇ m obtained by the fine paper powder production method of the above embodiment is in the range of 50 wt% to 60 wt%. It is obtained by mixing with a resin and can be suitably used as a material for molding.
- a weight ratio means the ratio with respect to the total weight of a fine paper powder containing resin composition.
- the fine paper powder content When the fine paper powder content is less than 50% by weight, expression of functions such as strain absorption during molding based on the flexible structure of the paper powder is suppressed, and environmental performance is also reduced. On the other hand, when the fine paper powder content exceeds 60% by weight, the paper powder that does not exhibit melt fluidity at the molding temperature hinders the fluidity of the resin, which increases the risk of forming defects and increases the molding pressure. Energy consumption increases and environmental performance decreases.
- the resin is polyethylene, polypropylene, olefin elastomer, polystyrene, AS resin (acrylonitrile-styrene copolymer synthetic resin), ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin), nylon, PBT (polybutylene terephthalate), PET ( Polyethylene terephthalate), and the weight ratio is 40% by weight or more and less than 50% by weight.
- a surface modifier In order to improve the kneadability between the fine paper powder and the resin, it is preferable to add a surface modifier and perform a surface modification treatment.
- Surface modifiers include various silane coupling agents, higher fatty acids such as stearic acid, various higher fatty acid esters, higher fatty acid amides, ethylene oligomers, polyethylene wax, maleic acid modified wax and maleic ester modified wax, low molecular weight crystalline polyolefin It is preferable that it is any 1 type or 2 types or more.
- the silane coupling agent enhances the interaction between the inorganic particles and the resin and improves the kneadability with the resin by adsorbing to the inorganic pigment contained in the paper powder.
- Other surface modifiers improve kneadability by enhancing the interaction between paper dust and resin.
- the surface modifier is preferably contained in the range of 0.1 wt% to 5 wt%. If the addition amount of the surface modifier is less than 0.1% by weight, a sufficient kneadability improving effect cannot be obtained, and if it exceeds 5% by weight, there is a high possibility that adverse effects such as an exudation phenomenon on the surface of the molded product will occur.
- the resin modifier is preferably one or two of maleic acid-modified polyolefin, olefin-maleic anhydride copolymer, maleic acid-modified wax and maleic acid ester-modified wax. These resin modifiers are mixed with a resin, particularly an olefin resin, to introduce a polar group, enhance the interaction with paper dust, and improve kneadability.
- the resin modifier is preferably contained in the range of 0.5 wt% to 10 wt%. If the addition amount of the resin modifier is less than 0.5% by weight, the modification effect is poor, and if it exceeds 10% by weight, the inherent properties of the resin such as rigidity and strength may be impaired.
- the fine paper powder-containing composition can be produced using an extruder. Fine paper powder and resin, as well as a surface modifier and a resin modifier, are introduced as necessary from an inlet (hopper) provided at the rear end of the extruder. The inside of the extruder is heated, and the fine paper powder and the resin are kneaded by the rotating screw to form a molten mixture in which the fine paper powder is dispersed substantially uniformly in the resin. This molten mixture is extruded from a die (die) provided at the front end of the extruder to produce a fine paper powder-containing resin composition having a predetermined cross-sectional shape.
- a die die
- the fine paper powder-containing resin composition is formed into a pellet shape, a plate shape, a sheet shape, or the like.
- the pellet-like fine paper powder-containing resin composition can be suitably used as a material for molding such as injection molding, blow molding, inflation molding, vacuum molding, melt compression molding, press molding and the like.
- Example 1 The waste paper from cutting the paperboard was coarsely pulverized to 4 mm square with a cutter mill. Next, the first vertical roller mill 10 is used in the first fine grinding step, and the second vertical roller mill 20 is used in the second fine grinding step, and these steps are connected to obtain fine paper powder having an average particle size of 45 ⁇ m. It was. Carbon dioxide emissions from the resource collection to fine paper dust production calculated by life cycle assessment support software (JEMAI-LCA Pro Ver. 212, manufactured by Japan Association for Industrial Environment Management) is 0.138kg / paper dust 1 kg.
- life cycle assessment support software JEMAI-LCA Pro Ver. 212, manufactured by Japan Association for Industrial Environment Management
- 50 parts by weight of the fine paper powder was fed into the twin screw extruder from the first inlet, and 50 parts by weight of polypropylene homopolymer (Novatec PP MA3AQ, manufactured by Nippon Polyethylene Co., Ltd.) from the second inlet, and pelletized.
- polypropylene homopolymer Novatec PP MA3AQ, manufactured by Nippon Polyethylene Co., Ltd.
- This pellet was used for injection molding to obtain a bowl-shaped molded product.
- This molded product showed a good appearance without spots due to poor dispersion of fine paper powder.
- a box-shaped molded product was also injection molded, but it was good with little molding warpage.
- Example 1 The waste paper from cutting the paperboard was coarsely pulverized to 4 mm square with a cutter mill. Next, the first vertical roller mill 10 was used in the first fine grinding step, and the first vertical roller mill 10 was used in the second fine grinding step, and these steps were connected to obtain fine paper powder having an average particle size of 45 ⁇ m. However, the paper powder easily became cottony in the second pulverization step.
- the carbon dioxide emission amount of fine paper powder production calculated in the same manner as in Example 1 was 0.160 kg / paper powder 1 kg, and the advantage of using waste paper whose environmental load was substantially zero as a raw material became poor.
- Example 2 The waste paper from cutting the paperboard was coarsely pulverized to 4 mm square with a cutter mill. Subsequently, the second vertical roller mill 20 was used in the first fine grinding step, and the second vertical roller mill 20 was used in the second fine grinding step, and these steps were connected to obtain fine paper powder having an average particle size of 50 ⁇ m. .
- the carbon dioxide emission amount of fine paper powder production calculated in the same manner as in Example 1 was 0.168 kg / paper powder 1 kg, and the advantage of using waste paper whose environmental load was substantially zero as a raw material became poor.
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Abstract
Description
板紙の裁断廃紙を、カッターミルで4mm角に粗粉砕した。次いで、第1微粉砕工程で第1竪型ローラミル10を、第2微粉砕工程で第2竪型ローラミル20をそれぞれ用い、これら工程を連結して行い、平均粒径45μmの微細紙粉を得た。ライフサイクルアセスメント実施支援ソフトウェア(社団法人産業環境管理協会製、JEMAI-LCA Pro Ver.212)により算出した資源採取から微細紙粉製造までをシステム境界とする二酸化炭素排出量は0.138kg/紙粉1kgであった。
板紙の裁断廃紙を、カッターミルで4mm角に粗粉砕した。次いで、第1微粉砕工程で第1竪型ローラミル10を、第2微粉砕工程でも第1竪型ローラミル10を用い、これら工程を連結して行い、平均粒径45μmの微細紙粉を得たが、第2微粉砕工程で紙粉が綿状となりやすくなった。実施例1と同様に算出した微細紙粉製造の二酸化炭素排出量は0.160kg/紙粉1kgであり、環境負荷が実質ゼロである廃紙を原料として使う利点が乏しくなった。
板紙の裁断廃紙を、カッターミルで4mm角に粗粉砕した。次いで、第1微粉砕工程で第2竪型ローラミル20を、第2微粉砕工程でも第2竪型ローラミル20を用い、これら工程を連結して行い、平均粒径50μmの微細紙粉を得た。実施例1と同様に算出した微細紙粉製造の二酸化炭素排出量は0.168kg/紙粉1kgであり、環境負荷が実質ゼロである廃紙を原料として使う利点が乏しくなった。
Claims (4)
- 粗粉砕された紙粉を、外周面に溝が形成された複数の第1粉砕ローラを備えた第1竪型ローラミルを用いて粉砕し、平均粒径50μm以上150μm未満の微細紙粉を得る第1微粉砕工程と、
該第1微粉砕工程で得た微細紙粉を、外周面に溝が形成された複数の第2粉砕ローラを備えた第2竪型ローラミルを用いて粉砕し、平均粒径25μm以上50μm未満の微細紙粉を得る第2微粉砕工程とを備え、
前記第1粉砕ローラの回転軸に対する当該第1粉砕ローラの溝の傾斜角が、前記第2粉砕ローラの回転軸に対する当該第2粉砕ローラの溝の傾斜角よりも小さいことを特徴とする微細紙粉製造方法。 - 前記第1粉砕ローラの回転軸に対する当該第1粉砕ローラの溝の傾斜角が5度以上45度以下であり、前記第2粉砕ローラの回転軸に対する当該第2粉砕ローラの溝の傾斜角が45度以上85度以下であることを特徴とする請求項1に記載の微細紙粉製造方法。
- 前記第1粉砕ローラ及び前記第2粉砕ローラの溝の底部が側面視円弧状であることを特徴とする請求項1又は2に記載の微細紙粉製造方法。
- 請求項1から3の何れか1項に記載の微細紙粉製造方法によって得た平均粒径25μm以上50μm未満の微細紙粉を、重量比が50重量%から60重量%の範囲となるよう、ポリエチレン、ポリプロピレン、オレフィン系エラストマー、ポリスチレン、アクリロニトリル-スチレン共重合合成樹脂、アクリロニトリルーブタジエン-スチレン共重合合成樹脂、ナイロン、ポリブチレンテレフタレート、ポリエチレンテレフタレートのうちの何れか少なくとも1種の樹脂に混和させて得たことを特徴とする成形加工用微細紙粉含有樹脂組成物。
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