CN103438678B - Efficient energy-saving pulp dewatering and drying equipment - Google Patents
Efficient energy-saving pulp dewatering and drying equipment Download PDFInfo
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- CN103438678B CN103438678B CN201310368502.5A CN201310368502A CN103438678B CN 103438678 B CN103438678 B CN 103438678B CN 201310368502 A CN201310368502 A CN 201310368502A CN 103438678 B CN103438678 B CN 103438678B
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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
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- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses efficient energy-saving pulp dewatering and drying equipment which mainly comprises a double-roller pulp squeezing machine with a hot rolling structure, a two-segment drying chamber, a microwave generator, a heat conductive oil boiler, an air preheater, a heat exchanger and the like. The double-roller pulp squeezing machine with the hot rolling structure is characterized in that waste heat of exhaust gas of a system can be used for carrying out thermal conduction on a pulp plate so that pulp drying conditions can be optimized; the two-segment drying chamber carries out constant-speed drying and decelerating drying on pulp respectively; the microwave generator is arranged and works on a position close to a turning point from the constant-speed dewatering stage to the decelerating dewatering stage of the pulp, and is used for improving the drying speed of a pulp decelerating drying segment and reducing energy consumption; the air preheater is used for recycling the waste heat of flue gas exhausted by the thermal conductive oil boiler and preheating fresh air supplemented to the system. The efficient energy-saving pulp dewatering and drying equipment has the advantages of being simple, high in drying speed, high in energy utilization rate, wide in application range and the like.
Description
Technical field
The invention belongs to industrially drying technical field, simultaneously also can be applied to other industrially drying field, be drying for paper pulp and a kind of Processes and apparatus of designing, particularly relate to a kind of energy-efficient dewatering of pulp drying equipment.
Background technology
The a large amount of paper pulp of China annual import, carries out drying to paper pulp and paper pulp can be made to be convenient to preserve and transport.At present, the technology that pulp dryer is conventional mainly contains pneumatic conveying drying and heated-air drying (i.e. flash drying).
The main flow of pneumatic conveying drying is: the paper pulp that mass dryness fraction is approximately 3% through press master crushed after, mass dryness fraction reaches about 50%; Pulpboard after shove is admitted in fluffer to be broken up, and the paper pulp after breaing up the diametrically group of several millimeters is cotton-shaped; Paper pulp group's wadding is admitted to bottom vertical drying tower, is blown from the bottom up in tower by hot blast, and when arriving certain mass dryness fraction, paper pulp discharges drying tower with hot blast, enters in cyclone separator.Paper pulp group's wadding is admitted to next stage drying tower and again carries out drying, until reach required mass dryness fraction after being separated by cyclone separator.The thermal efficiency ratio of pneumatic conveying drying is higher, and rate of drying is also very fast, but its equipment is more complicated, installs and keeps in repair more difficult; And run the mechanical power needing consumption a large amount of.
Heated-air drying adopts the most a kind of drying mode at present, mainly adds hot-air by heat exchanger, take away the moisture content of paper pulp with hot-air.It has the advantages such as treating capacity is large, cost is low, easily be automated, but also has the shortcomings such as energy consumption is large, product quality is poor simultaneously.
Microwave drying is the body heating that material is caused by dielectric loss at elect magnetic field, in dry run, often specific surface is high for the moisture content of wet stock inside, causes internal batch moisture absorb microwave energy in a large number and be converted into heat energy, and therefore the temperature specific surface of internal batch is high.Meanwhile, due to internal batch be heated heat up and make water rapid vaporization, produce steam, define barometric gradient; At this moment wet stock thermograde and barometric gradient are consistent with the dispersal direction of water, and this just significantly improves the transition condition of moisture in dry run, thus effectively improve the diffusion rate of moisture, accelerate rate of drying.Simultaneously, due to the existence of barometric gradient, microwave drying is made to have dry feature from inside to outside: for throughout its mass, material internal layer is first dried, thus overcome and form skin-core structure because material skin is first dried in heat-wind circulate drying, hinder the continuation of material internal moisture to the shortcoming of external migration, substantially improve the transition condition of moisture in dry run, thus improve the diffusion rate of moisture, accelerate rate of drying.
Microwave drying has the advantages such as firing rate is fast, capacity usage ratio is high, occupation area of equipment is little, and its major defect is the poor and wayward product quality of the later stage of drying of heating uniformity, and production capacity is limited, maintenance of equipment high in cost of production.
Research finds, dewatering of pulp dry run has two stages: at the uniform velocity drying stage and decreasing drying rate period.At at the uniform velocity drying stage, rate of drying and material self moisture content do not have great relation, and improve flow velocity and the temperature of outer gas stream, reducing ambient air outside humidity is improve the key of at the uniform velocity drying stage rate of drying; And at decreasing drying rate period, Quick high object internal temperature improves the effective way of rate of drying.
Comprehensive heated-air drying and microwave drying pluses and minuses separately, in conjunction with dewatering of pulp Track character, consider that coupling uses microwave drying in hot-air drying process: namely when heated-air drying arrives critical moisture content point, introduce microwave drying with Quick high object internal temperature, reach the object improving rate of drying.
As shown in Figure 1.The at the uniform velocity drying stage of dewatering of pulp adopts heated-air drying, when drying proceeds at the uniform velocity with deceleration Near The Critical Point, drop into microwave drying, microwave is utilized to carry out the overall heating particularly inner feature heated to material, make paper pulp internal moisture can evaporate discharge rapidly, so just be conducive to shortening drying time, improve drying efficiency.
Summary of the invention
The object of the present invention is to provide the energy-efficient dewatering of pulp drying equipment that a kind of capacity usage ratio is high, production efficiency is high.
For achieving the above object, technical solution of the present invention is:
The present invention is a kind of energy-efficient dewatering of pulp drying equipment, and it comprises frame, paper pulp cutting mechanism, heat exchanger, air preheater, microwave generator, Var-nip press, hot air circulating pipe, material transport system, hothouse, heat conducting oil boiler; Frame is provided with Var-nip press, hothouse, heat exchanger, paper pulp cutting mechanism from left to right successively, heat conducting oil boiler is arranged on the upper of frame and is positioned at the below of hothouse, microwave generator is arranged on the upper of frame and is positioned at the top of hothouse, wherein, Var-nip press is positioned at the starting end of hothouse and docks with the material transport system of hothouse; Paper pulp cutting mechanism is positioned at the end of hothouse, and paper pulp cutting mechanism is docked with the material transport system in hothouse by hot air circulating pipe, and described heat exchanger is connected with heat conducting oil boiler, hothouse, air preheater respectively.
Described hothouse is divided into two sections, and it is made up of the first hothouse and secondary drying chamber; First hothouse and secondary drying chamber are mutually connected and are arranged on the middle part of frame, and Two stage dryer separates with dividing plate between room, are communicated with between the first hothouse and secondary drying chamber by hot air circulating pipe; Material transport system is separately installed with in the first hothouse and secondary drying chamber.
Described microwave generator to be arranged between the first hothouse and secondary drying chamber and to be positioned at the top of hothouse, the end of the microwave action that microwave generator produces in the first hothouse and the initiating terminal of secondary drying chamber.
Described heat exchanger is air-heat-condutive oil heat exchanger, and the body of heat exchanger is provided with conduction oil entrance and exit, hot-wind inlet and hot-blast outlet; Described conduction oil entrance is connected with heat conducting oil boiler, and conduction oil is from heat conducting oil boiler; Hot-blast outlet leads to hothouse by hot air circulating pipe, and hot-wind inlet is connected with air preheater, utilizes the high-temperature flue gas of boiler to carry out preheating to improve energy utilization rate to fresh air.
Described Var-nip press comprises hopper, roll-in case, the first conveyer belt, roll-in cylinder, the second conveyer belt, hot-rolling pressure pipe, described hopper is arranged on the porch of roll-in case and the outlet of hopper is relative with the first conveyer belt be arranged in roll-in case, two symmetries are arranged in roll-in case, the output of the first conveyer belt and the input of the second conveyer belt are connected respectively at two roll-in cylinder inputs and output, the input of the hot-rolling pressure pipe that output and some rows of the second conveyer belt are arranged symmetrically with is connected, this hot-rolling pressure pipe is hollow roller, roller inner is furnished with the fin strengthening convection heat transfer' heat-transfer by convection, roller one end is connected with hothouse hot-wind inlet by hot air circulating pipe, the other end is hot-blast outlet.
Described air preheater is made up of housing and center rotor, and in the rotatable housing mounted externally of center rotor, housing plays the effect of outside seal and gas flow guiding, and center rotor plays the effect of heat exchanger.
After adopting such scheme, tool of the present invention has the following advantages:
1, the present invention has given full play to heated-air drying and microwave drying advantage had separately, and coupling utilizes heating using microwave and Hot-blast Heating technology to carry out drying to paper pulp, makes up the lower deficiency of heated-air drying efficiency with the high efficiency of microwave drying; Low with heated-air drying cost, that output is large advantage makes up the deficiency that microwave drying cannot be carried out producing in enormous quantities simultaneously.
2, the waste heat of the present invention's recycling system as far as possible, realizes the efficiency utilization of system capacity: one is utilize air preheater to reclaim the fume afterheat that heat conducting oil boiler discharges; Two has been innovative designs utilizes the hot calender structure of humid air waste heat, and the complementary energy had with the outer heat extraction humid air of hot-rolling recycling system, for promoting pulp board initial temperature; Three is allow heat-containing waste gas recycle by a certain percentage.Therefore, whole drying plant has higher energy utilization efficiency.
3, the present invention adopts semi-automatic control, can arrange the running parameters such as different transfer rates, hot blast temperature and hot blast air quantity, to improve device production efficiency and energy utilization rate according to different types of paper pulp.
In sum, advantage of the present invention is that device structure is simple, applicable object extensive, and capacity usage ratio is high, production efficiency is high, can substitute existing paper pulp pneumatic conveying drying technology well, for enterprise brings energy-saving and emission-reduction benefit.If carry out certain transformation to this case equipment, even also the present invention can be applied in the dehydrating of other industrial and agricultural products and go.Therefore, the present invention not only has the feature of efficient energy-saving, and has a wide range of applications and expand space.
Below in conjunction with accompanying drawing, the present invention is further illustrated with concrete enforcement example.
Accompanying drawing explanation
Fig. 1 is coupling microwaves drying principles schematic diagram in hot-air drying process;
Fig. 2 is structured flowchart of the present invention;
Fig. 3 A is front section view of the present invention;
Fig. 3 B is top view of the present invention;
Fig. 4 A is the axonometric drawing of heat exchanger of the present invention;
Fig. 4 B is the front view of heat exchanger of the present invention;
Fig. 4 C is the top view of heat exchanger of the present invention;
Fig. 5 is the precedence diagram of hot air flow of the present invention through each equipment;
Fig. 6 is the structural representation of Var-nip press inside of the present invention;
Fig. 7 A, Fig. 7 B are axonometric drawing and the three-view diagram of air preheater of the present invention.
Specific embodiments
As shown in Fig. 2, Fig. 3 A, Fig. 3 B, the present invention is a kind of energy-efficient dewatering of pulp drying equipment, it primarily of frame 1, paper pulp cutting mechanism 2, heat exchanger 3, air preheater 4, microwave generator 5, Var-nip press 6, hot air circulating pipe 71,72,73, material transport system 81,82, hothouse 9, heat conducting oil boiler 10, etc. composition.
Described hothouse 9 is divided into two sections, and it is made up of the first hothouse 91 and secondary drying chamber 92.First hothouse 91 and secondary drying chamber 92 are mutually connected and are arranged on the middle part of frame 1, and Two stage dryer separates with dividing plate between room, is communicated with between the first hothouse 91 and secondary drying chamber 92 by hot air circulating pipe 73.In the first hothouse 91 and secondary drying chamber 92, be separately installed with material transport system 81,82, the outer wrap insulation material of hothouse 9 is to reduce radiation loss.Paper pulp carries out at the uniform velocity dry in the first hothouse 91, in secondary drying chamber 92, carry out falling rate of drying.
Frame 1 is provided with Var-nip press 6, hothouse 9, heat exchanger 3, paper pulp cutting mechanism 2 from left to right successively, heat conducting oil boiler 10 is arranged on the upper of frame and is positioned at the below of hothouse 9, wherein, Var-nip press 6 is positioned at the starting end of the first hothouse 91 and docks with the material transport system 81 of the first hothouse 91; Paper pulp cutting mechanism 2 is positioned at the end of secondary drying chamber 92, i.e. discharge outlet, and paper pulp cutting mechanism 2 docks with the material transport system 82 in secondary drying chamber 92.Described paper pulp cutting mechanism 2 cuts cardboard by conputer controlled by certain time interval, makes cardboard size facilitate packing and binding.Paperboard cutting mechanism 2 is provided with the microwave short-circuiting means preventing microwave leakage, produces injury to prevent microwave leakage to workman.
Described microwave generator 5 is arranged in frame 1, between the first hothouse 91 and secondary drying chamber 92 and above hothouse 9, and the end of the microwave action that microwave generator 5 produces in the first hothouse 91 and the initiating terminal of secondary drying chamber 92.Altogether containing the magnetron that several power are identical in microwave generator 5, the microwave action that some of them magnetron produces is in the initiating terminal of the first hothouse 91, and the microwave action that other magnetron produces is in the end of secondary drying chamber 92.In real work, number and the position of magnetron unlatching can be decided according to concrete running parameter; And adapt to different Production requirements by the size and active position regulating microwave action power.Described microwave generator 5 works near the critical moisture content point of paper pulp, and its effect devotes oneself to work to improve rapidly the temperature of pulpboard internal moisture in the starting stage of falling rate of drying, thus improve the rate of drying of decreasing drying rate period.
Described material transport system 81 is primarily of compositions such as drive unit 811, conveyer belt 812, running rollers 813, conveyer belt 812 solderless wrapped connection is on running roller 813, drive unit 811 for the conveyer belt 812 in hothouse 9 provides power, can by computer control its transfer rate according to need of production for conveyer belt 812.
If Fig. 4 A, Fig. 4 B, Fig. 4 C are with reference to shown in figure 3A, described heat exchanger 3 is air-heat-condutive oil heat exchanger.The body of heat exchanger 3 is provided with conduction oil entrance 31 and conduction oil outlet 32, hot-wind inlet 33 and hot-blast outlet 34.Described conduction oil entrance 31 is connected with heat conducting oil boiler 10, and conduction oil is from heat conducting oil boiler 10; Hot-blast outlet 34 leads to the first hothouse 91 by hot air circulating pipe 71.Hot-wind inlet 33 is connected with air preheater 4, utilizes the high-temperature flue gas of boiler to carry out preheating to improve energy utilization rate to fresh air.
As shown in Figure 6, described Var-nip press 6 comprises hopper 61, roll-in case 62, first conveyer belt 63, roll-in cylinder 64, second conveyer belt 65, hot-rolling pressure pipe 66.Described hopper 61 is arranged on the porch of roll-in case 62 and the outlet of hopper 61 is relative with the first conveyer belt 63 be arranged in roll-in case 62, two symmetries are arranged in roll-in case 62, the output of the first conveyer belt 63 and the input of the second conveyer belt 65 are connected respectively at two roll-in cylinder 64 inputs and output, the input of the hot-rolling pressure pipe 66 that output and some rows of the second conveyer belt 65 are arranged symmetrically with is connected, this hot-rolling pressure pipe 66 is hollow roller 66, and roller 66 internal placement has the fin strengthening convection heat transfer' heat-transfer by convection.Roller 66 one end is connected with the first hothouse 91 hot-wind inlet by hot air circulating pipe 72, and the other end is hot-blast outlet.Hot blast is introduced by secondary drying chamber 92 exhaust outlet; Hot blast after heat exchange is discharged by the other end of roller 66, and the hot blast after discharge enters again heat exchanger 3 after having part to mix by a certain percentage with fresh air and heats, then puts in next drying cycles process.Described Var-nip press 6 is used for carrying out roll-in to wet pulp (mass dryness fraction is about 3%), and the portion of water in paper pulp is removed, and after roll-in, the mass dryness fraction of paper pulp is greatly about about 50%.With press master conventional in existing industry unlike, the press master of this equipment adds the hot calender structure formed primarily of hot-rolling pressure pipe 66, and to utilize the heat energy of dry rear moist hot blast, this hot calender structure carries out transmission of heat by contact to pulp board, its temperature is raised, facilitates the heat drying in later stage.
As shown in Figure 7 A, 7 B, described air preheater 4 is a kind of rotary regenerative air preheater, it is made up of housing 41, center rotor 42, support 43, in the rotatable housing 41 mounted externally of center rotor 42, housing 41 plays the effect of outside seal and gas flow guiding, and center rotor 42 plays the effect of heat exchanger.Mark off flue gas Circulation Area, air circulation district and seal area respectively at the correspondence position of center rotor 42 top and bottom, external shell 41 then forms First air storehouse, Secondary Air storehouse and flue gas storehouse in the certain limit in these regions.Wherein once form cold wind side with Secondary Air storehouse, flue gas storehouse forms hot blast side.Each warehouse upper and lower side forms respective gas flow ventilating duct by external shell and airduct respectively.
As shown in Figure 5, for hot air flow is through the precedence diagram of each equipment.After fresh air mixes with the moist hot air of certain proportion (amount), enter air preheater 4 preheating, air after preheating enters in air-heat-condutive oil heat exchanger 3 and heats, be divided into two strands from heat exchanger 3 hot-air (wind) out, one directly enter in the first hothouse, paper pulp is carried out at the uniform velocity dry; Another strand enters secondary drying chamber after mixing with the hot blast of discharging from the first hothouse, carries out falling rate of drying to paper pulp; Two strands of hot-airs come together in hot air circulating pipe 73 place.
As shown in Fig. 3 A, Fig. 3 B, hot air circulating system of the present invention is made up of air blast, ajutage, air-introduced machine, hot air circulating pipe 71,72,73 and valve etc.Described air blast is used for carrying fresh air to air preheater 4; Described blower-use is in providing the air after heating in hothouse; Described hot air circulating pipe 71,72,73 and valve are used for the conveying of hot blast and the control of air quantity; Described air-introduced machine is for getting rid of the higher humid air of water capacity in drying system.
Described control system adopts semi-automatic operation, sets manually, and controls the normal operation of complete equipment: the operation of the small-sized heat conducting oil boiler of major control; Control microwave radiation and the radiated time of microwave generation system; Control hot blast temperature, the hot blast wind speed of hot air circulating system; The parameters such as the mass transport direction of control material transport system and speed.
Operation principle of the present invention:
As shown in Fig. 3 A, Fig. 3 B, wet rare paper pulp extrudes after in pulpboard shape through Var-nip press 6, enter in the hot-rolling pressure device formed primarily of hot-rolling pressure pipe 66, by hot-rolling pressure device, transmission of heat by contact is carried out to pulpboard, waste heat contained by the humid air that the heat energy of hot-rolling pressure device is discharged from system.Be admitted in secondary drying chamber 92 by the pulp board after heating, it carried out at the uniform velocity dry, until paper pulp reaches its critical moisture content point by hot blast on a moving belt.Paper pulp at the uniform velocity drying close to an end, falling rate of drying be about to start time, the microwave drying of microwave generator 5 is coupled in hothouse 9, utilizes the moisture of microwave to paper pulp inside to heat, the moisture of paper pulp inside is evaporated, thus greatly promote rate of drying, reduce the intensification power consumption of paper pulp.In the first hothouse 91, temperature is higher, and the hot blast that mass dryness fraction is larger carries out falling rate of drying to paper pulp, makes the mass dryness fraction of paper pulp finally reach production requirement.Finally, cut by paper pulp cutting mechanism 2 pairs of pulpboards in the exit of hothouse 9, make the appearance and size of the dry pulp plate of output all consistent.
The above, be only the better case study on implementation of the present invention, the layout of each pipeline can have various ways, therefore can not limit scope of the invention process with this, namely the equivalence done according to the present patent application the scope of the claims and description changes and modifies, and all should still remain within the scope of the patent.
Claims (6)
1. an energy-efficient dewatering of pulp drying equipment, is characterized in that: it comprises frame, paper pulp cutting mechanism, heat exchanger, air preheater, microwave generator, Var-nip press, hot air circulating pipe, material transport system, hothouse, heat conducting oil boiler; Frame is provided with Var-nip press, hothouse, heat exchanger, paper pulp cutting mechanism from left to right successively, heat conducting oil boiler to be arranged in frame and to be positioned at the below of hothouse, microwave generator to be arranged in frame and to be positioned at the top of hothouse, wherein, Var-nip press is positioned at the starting end of hothouse and docks with the material transport system of hothouse; Paper pulp cutting mechanism is positioned at the end of hothouse, and paper pulp cutting mechanism is docked with the material transport system in hothouse by hot air circulating pipe, and described heat exchanger is connected with heat conducting oil boiler, hothouse, air preheater respectively.
2. energy-efficient dewatering of pulp drying equipment according to claim 1, it is characterized in that: described hothouse is divided into two sections, it is made up of the first hothouse and secondary drying chamber; First hothouse and secondary drying chamber are mutually connected and are arranged on the middle part of frame, and Two stage dryer separates with dividing plate between room, are communicated with between the first hothouse and secondary drying chamber by hot air circulating pipe; Material transport system is separately installed with in the first hothouse and secondary drying chamber.
3. energy-efficient dewatering of pulp drying equipment according to claim 2, it is characterized in that: described microwave generator to be arranged between the first hothouse and secondary drying chamber and to be positioned at the top of hothouse, the end of the microwave action that microwave generator produces in the first hothouse and the initiating terminal of secondary drying chamber.
4. energy-efficient dewatering of pulp drying equipment according to claim 1, it is characterized in that: described heat exchanger is air-heat-condutive oil heat exchanger, the body of heat exchanger is provided with conduction oil entrance and exit, hot-wind inlet and hot-blast outlet; Described conduction oil entrance is connected with heat conducting oil boiler, and conduction oil is from heat conducting oil boiler; Hot-blast outlet leads to hothouse by hot air circulating pipe, and hot-wind inlet is connected with air preheater, utilizes the high-temperature flue gas of boiler to carry out preheating to improve energy utilization rate to fresh air.
5. energy-efficient dewatering of pulp drying equipment according to claim 1, is characterized in that: described Var-nip press comprises hopper, roll-in case, the first conveyer belt, roll-in cylinder, the second conveyer belt, hot-rolling pressure pipe; Described hopper is arranged on the porch of roll-in case and the outlet of hopper is relative with the first conveyer belt be arranged in roll-in case, the output of the first conveyer belt and the input of the second conveyer belt are connected with two roll-in cylinder inputs and output respectively, the input of the hot-rolling pressure pipe that output and some rows of the second conveyer belt are arranged symmetrically with is connected, this hot-rolling pressure pipe is hollow roller, roller inner is furnished with the fin strengthening convection heat transfer' heat-transfer by convection, roller one end is connected with hothouse hot-wind inlet by hot air circulating pipe, and the other end is hot-blast outlet.
6. energy-efficient dewatering of pulp drying equipment according to claim 1, it is characterized in that: described air preheater is made up of housing and center rotor, in the rotatable housing mounted externally of center rotor, housing plays the effect of outside seal and gas flow guiding, and center rotor plays the effect of heat exchanger.
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| CN201310368502.5A CN103438678B (en) | 2013-08-22 | 2013-08-22 | Efficient energy-saving pulp dewatering and drying equipment |
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| CN106403315A (en) * | 2016-11-30 | 2017-02-15 | 丁雪枫 | Multi-energy energy saving drying system |
| CN109231769B (en) * | 2018-10-30 | 2023-12-26 | 深圳市中科绿建环保工程有限公司 | Mechanical filter-pressing microwave coupling dehydration desiccation integrated device |
| CN109738325B (en) * | 2019-01-23 | 2021-10-26 | 河北万杰机械科技股份有限公司 | Experimental instrument for testing printing ink printing drying rate |
| TWI754529B (en) * | 2021-01-27 | 2022-02-01 | 永虹先進材料股份有限公司 | Mineral water removal equipment and process |
| CN116876250A (en) * | 2023-07-07 | 2023-10-13 | 浙江金龙再生资源科技股份有限公司 | Device and process for producing exposed-bottom-ash-free paperboard with increased bulk |
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| US5064979A (en) * | 1990-08-07 | 1991-11-12 | W. R. Grace & Co.-Conn. | Microwave air float bar for drying a traveling web |
| CN1281075A (en) * | 1999-07-02 | 2001-01-24 | 永固纤维板股份有限公司 | Stack board of waste paper pulp and its making technology |
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