CN114290700A - Sintering method of plastic sintered plate base material - Google Patents
Sintering method of plastic sintered plate base material Download PDFInfo
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- CN114290700A CN114290700A CN202111632847.8A CN202111632847A CN114290700A CN 114290700 A CN114290700 A CN 114290700A CN 202111632847 A CN202111632847 A CN 202111632847A CN 114290700 A CN114290700 A CN 114290700A
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Abstract
The invention provides a sintering method of a sintering plate base material, which comprises the following steps: based on the technical requirements of products, selecting powdery polyethylene high polymer materials with corresponding particle size ranges, and setting and testing the sintering temperature according to the process melting temperature; adding a powdery polyethylene high polymer material into a preheating device to obtain a preheated powdery polyethylene high polymer material; the spiral powder conveying below the preheating device is started, the preheated powdery polyethylene high polymer material is conveyed to the metering and proportioning mixing device, the color master powder, the dispersing agent and the activated carbon particle material are added into the metering and proportioning mixing device according to the proportion, and the mixture is filled into a metal mold for sintering after being fully mixed. The polyethylene high polymer material is preheated before being filled into the metal mold, so that the product quality of the plastic-sintered plate base material is ensured, the sintering time is reduced, the production cost is reduced, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of plastic sintered plate production, in particular to a sintering method of a plastic sintered plate base material.
Background
Due to the advantages of high precision, low emission and long service life, the sintered plate filter has more and more applications in various industries at present, wherein the sintered plate base material is formed by sintering polyethylene high molecular materials in a metal mold. The thermal diffusion speed deviation of two materials of polyethylene polymer material and metal mold, which is produced by different thermal conductivities, is large, and meanwhile, because the temperatures of different positions of the whole heating area are different to a certain extent, the porosity of the substrate of the plastic-sintered plate at different positions is inconsistent, or the strength of the substrate is reduced because the temperature does not reach the sintering temperature.
The prior sintering methods of the plastic sintered plate comprise two types, namely interference temperature sintering and graded temperature sintering. The classified temperature sintering is to fully and uniformly heat polyethylene polymer materials in a metal die through different preheating stages until the temperature reaches the sintering temperature and then cool and mold the materials, and the classified temperature sintering has the advantages of high sintering yield, simple process adjustment, good porosity of a plastic sintered plate substrate, no plasticizing phenomenon, long heating time, high energy consumption and high product cost; the interference temperature sintering is heating sintering with the interference temperature value exceeding the sintering temperature, mainly utilize the heat conductivity of metal mold to be better than the heat conductivity control heating time of polyethylene macromolecular material, adjust repeatedly between the interference temperature from being less than sintering temperature to the interference temperature promptly, utilize the good characteristics of metal heat conductivity constantly to heat transfer to inside polyethylene macromolecular material in, utilize the interference temperature to keep sintering temperature, make polyethylene macromolecular material cool off the shaping after being in the semi-molten state of sintering, its advantage is that heating time reduces, manufacturing cost and energy consumption have been reduced, the shortcoming is that polyethylene macromolecular material sintering temperature slightly has the deviation, technology adjustment is difficult, because improper interference temperature control can make the plastify phenomenon easily appear with the metal mold contact surface, it is lower to mould board substrate porosity.
Therefore, it is necessary to develop a sintering method for a sintered plate substrate, in which a polyethylene polymer material is preheated before being loaded into a metal mold, so as to ensure the product quality of the sintered plate substrate, reduce the sintering time, reduce the production cost, and improve the production efficiency.
Disclosure of Invention
The present invention is directed to solving one of the technical problems of the prior art or the related art.
Therefore, the invention provides a sintering method of a plastic sintered plate substrate.
In view of the above, the present invention provides a sintering method for a sintered plate substrate, the sintering method comprising:
based on the technical requirements of products, selecting powdery polyethylene high polymer materials with corresponding particle size ranges, and setting and testing the sintering temperature according to the process melting temperature;
adding the powdery polyethylene high polymer material into a preheating device to obtain the preheated powdery polyethylene high polymer material;
starting a spiral powder conveyor below the preheating device, conveying the preheated powdery polyethylene high polymer material to a metering and blending mixing device, simultaneously adding color master powder, a dispersing agent and an active carbon particle material into the metering and blending mixing device according to the proportion, fully mixing and filling into a metal mold;
and conveying the filled metal mold to a heating furnace, and sintering and heating according to the sintering temperature.
Further, the preheating device includes:
the preheating bin is provided with a feeding port at the upper part and is internally provided with a preheating module, the bottom of the preheating bin is connected with the metering and batching mixing device through the spiral powder conveyor, and the metering and batching mixing device is put into the metal mold according to the requirement;
the separator is arranged above the preheating bin;
and the air inlet of the heat exchanger is communicated with the air outlet of the separator through an air outlet pipeline, and the air outlet of the heat exchanger is communicated with the preheating bin through a hot air pipeline.
Further, the separator includes:
the shell is arranged above the preheating bin;
the blowing pipe is arranged in the shell and is positioned at the upper part of the shell;
a plurality of filter cartridges disposed below the blowing pipe;
the blowing hole is arranged in the blowing pipe and corresponds to the filter cylinder;
the high-pressure centrifugal fan is arranged between the air outlet pipeline and one end of the injection pipe;
and the pulse injection module is arranged opposite to the high-pressure centrifugal fan and is connected with the other end of the injection pipe.
Further, the pulse blowing module includes:
the air storage tank is arranged outside the shell;
and one end of the pulse valve is connected with the air outlet of the air storage tank, the other end of the pulse valve is communicated with the blowing hole, and the pulse valve is fixedly connected with the shell through a plate wall connector.
Further, obtaining the preheated powdery polyethylene polymer material comprises:
putting the powdery polyethylene high polymer material into a preheating bin, and starting the preheating module;
the preheating module drives the separator, the powdered polyethylene high polymer material is attached to the outside of the filter cylinder, and clean air in the preheating bin is pumped out, heated by the heat exchanger and then input into the preheating bin again;
and the polyethylene high polymer material attached to the outside of the filter cylinder is shaken off by a pulse blowing module.
Further, activating the preheat module includes:
when the temperature in the preheating bin does not reach the preset temperature, the preheating module is continuously started;
and when the temperature in the preheating bin reaches a preset temperature, stopping the preheating module and starting the spiral powder conveyor.
Further, the preset temperature is 72 ℃ to 78 ℃.
Further, the melting process temperature is 180 ℃, and the sintering temperature is 177 ℃ to 183 ℃.
Further, the metal mold is heated in the heating furnace at 215 ℃ to 225 ℃ for 65min and then at 180 ℃ to 190 ℃ for 60 min.
The technical scheme provided by the invention can have the following beneficial effects:
the polyethylene high polymer material is preheated before being filled into the metal mold, so that the temperature difference between the polyethylene high polymer material and the metal mold can be reduced, and the quality of the plastic sintered plate base material is improved; on the other hand, the method can reduce the subsequent sintering time, is effective and energy-saving, reduces the production cost and further improves the production efficiency.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 shows a schematic flow diagram of a sintering method for a sintered plate substrate according to one embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a process for obtaining a preheated polyethylene polymer material according to an embodiment of the present invention;
FIG. 3 shows a schematic view of a preheating arrangement according to an embodiment of the invention;
FIG. 4 is a graph of a prior art stepped temperature sintering profile;
FIG. 5 is a graph of a prior art interference temperature sintering curve;
fig. 6 is a sintering curve diagram of a sintering method of a sintered plate substrate according to the present invention.
Wherein, the correspondence between the reference numbers and the names of the components in fig. 3 is:
1 preheating bin, 2 charge inlets, 3 spiral powder conveyors, 4 metering, proportioning and mixing devices, 5 metal molds, 6 separators, 601 shells, 602 blowing pipes, 603 filter cartridges, 604 blowing holes, 605 high-pressure centrifugal fans, 606 pulse blowing modules, 6061 gas storage tanks, 6062 pulse valves, 7 heat exchangers, 8 air outlet pipelines, 9 hot air pipelines, 10 heat preservation units and 11 temperature control cabinets.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example 1
Fig. 1 shows a schematic flow chart of a sintering method of a sintered plate substrate according to an embodiment of the present invention.
As shown in fig. 1, the present embodiment provides a sintering method of a sintered plate substrate, the sintering method including:
step 1, selecting powdery polyethylene high polymer materials with corresponding particle size ranges based on the technical requirements of products, and setting and testing sintering temperatures according to process melting temperatures;
step 3, starting a spiral powder conveyor below the preheating device, conveying the preheated powdery polyethylene high polymer material to a metering and proportioning mixing device, simultaneously adding the color master powder, the dispersing agent and the activated carbon particle material into the metering and proportioning mixing device according to the proportion, fully mixing and filling into a metal mold;
and 4, conveying the filled metal mold to a heating furnace, and sintering and heating according to the sintering temperature.
The polyethylene high polymer material is preheated before being filled into the metal mold, so that the temperature difference between the polyethylene high polymer material and the metal mold can be reduced, and the quality of the plastic sintered plate base material is improved; on the other hand, the method can reduce the subsequent sintering time, is effective and energy-saving, reduces the production cost and further improves the production efficiency.
It should be noted that, the heating in the heating furnace is to heat the air in the heating furnace through the heating pipe of the heating furnace, then conduct the air to the metal mold after filling, and then perform semi-molten sintering on the polyethylene polymer material inside the heating furnace through the heat of the metal mold, because a plurality of heating furnaces work simultaneously, although each heating furnace passes through the calibration temperature sensor, the heating electrical performance is slightly deviated, so a sintering temperature needs to be set according to the melting process temperature, and the sintering temperature and the melting temperature have an allowable error, when the sintering temperature is tested and enters the heating furnace for sintering heating, a sample test is performed with each test time unit for 5 minutes to obtain the final sintering temperature.
The color master batch is prepared by mixing color according to the requirements of customers, the dispersing agent is an active anti-coagulation material made of a nonmetal material, the active carbon has the functions of absorbing peculiar smell and preventing common static electricity, and some explosion-proof materials can be added.
Fig. 2 shows a schematic flow chart of the method for obtaining the preheated polyethylene polymer material according to one embodiment of the present invention.
As shown in fig. 2, the method for obtaining the preheated powdery polyethylene polymer material comprises the following steps:
step 201, putting a powdery polyethylene high polymer material into a preheating bin, and starting a preheating module;
step 202, the preheating module drives a separator, the powdery polyethylene high polymer material is attached to the outside of the filter cylinder, clean air in the preheating bin is pumped out and heated by a heat exchanger, and then the clean air is input into the preheating bin again;
step 203, shaking off the polyethylene high polymer material attached to the outside of the filter cylinder through the pulse blowing module.
Wherein, start preheating module includes:
when the temperature in the preheating bin does not reach the preset temperature, the preheating module is continuously started;
and when the temperature in the preheating bin reaches the preset temperature, stopping the preheating module and starting the spiral powder conveyor.
Because powdered polyethylene macromolecular material's thermal conductivity is very poor, preheat the storehouse and adopt hot-blast preheating mode, when preheating the temperature in the storehouse and reaching preset temperature, preheat module control heat exchanger and stop heating, when preheating the temperature in the storehouse and being less than preset temperature, preheat module control heat exchanger and start heating, this process provides the amount of wind source through the separator mode and carries out the inner loop to reduce unnecessary calorific loss.
Further, the preset temperature is 72 ℃ to 78 ℃.
The method is characterized in that the method is determined according to the characteristics of a powdery polyethylene high polymer material, the preset temperature is lower than 80 ℃, the polyethylene high polymer material higher than 80 ℃ can generate a softening and agglomerating phenomenon, the polyethylene high polymer material is easy to accumulate in the narrow part of a mold to cause a cavity condition, the polyethylene high polymer material reaching the temperature range after preheating has certain heat loss after passing through a spiral powder conveyor and a metering and proportioning material mixing device, the temperature when entering a metal mold is finally ensured to be 65-68 ℃, meanwhile, the residual temperature of the metal mold after cleaning is also about 60 ℃, the temperature difference between the polyethylene high polymer material after preheating and the metal mold is not large, and the quality of the final finished product of the plastic sintered plate base material can be improved.
Further, the melting process temperature is 180 ℃, and the sintering temperature is 177 ℃ to 183 ℃.
It should be noted that the melting process temperature is a parameter required by the raw material (polyethylene polymer material) manufacturer, the sintering temperature is set according to the melting temperature, and the deviation between the sintering temperature and the melting temperature is generally ± 3 ℃.
Further, the metal mold is heated in a heating furnace at 215 to 225 ℃ for 65min and then at 180 to 190 ℃ for 60 min.
It should be noted that, according to the melting process temperature of the currently used powdered polyethylene high polymer material being 180 ℃, the thickness of the outer wall of the metal mold is about 20mm, because the metal mold is internally provided with the irregular shape of the teeth,the actual test shows that the complete internal and external isothermal time of the metal mold is about 50 minutes, so that the heating time of the polyethylene high molecular material in the metal mold is determined as 220 ℃ for 1 hour and 65 minutes, and then the heating time at 185 ℃ is 1 hour and 60 minutes, the porosity of the finished product of the base material of the sintered plate produced under the condition is more than or equal to 85 percent, and the initial differential pressure value is less than or equal to 217Pa/3500m3And h, meeting the technical requirements of products.
Specifically, the temperature of the heating furnace is firstly set to 220 ℃ for 65min, but the temperature of the filled metal mold has delay property compared with the temperature in the heating furnace, so when the temperature in the heating furnace reaches 220 ℃, the filled metal mold is only about 130 ℃, the constant temperature of the heating furnace at 220 ℃ needs to be controlled to be kept for 25min (40 min is needed when the temperature is previously heated to 220 ℃), the filled metal mold reaches about 165 ℃, then the temperature of the heating furnace is set to 185 ℃, the heating pipe in the heating furnace stops heating, the air in the heating furnace starts to be slowly cooled, but the temperature of the air in the heating furnace is still higher than the temperature of the metal mold, the metal mold can be continuously heated, when the temperature of the air in the heating furnace is reduced to 185 ℃ after about 18min and is kept constant at the temperature, the temperature of the metal mold also reaches about 180 ℃ at the moment, and is close to the melting temperature of the polyethylene high molecular material, however, because the thermal conductivity of the polyethylene polymer material is poor, the heat of the metal mold slowly permeates into the polyethylene polymer material, the time is about 60min in total, the heat is conducted to 180 ℃ of the metal mold based on 185 ℃ of hot air and then conducted to the inside of the polyethylene polymer material, at this time, because the temperature does not reach the necessary condition required by the melting of the polyethylene polymer material, namely, more than 180 ℃, the polyethylene polymer material is in a semi-molten state, and the contact surface of the metal mold and the polyethylene polymer material is sintered from outside to inside to form a material with certain strength and pores.
The spiral powder conveyor 3 includes an outer cylinder 301, a spiral blade 302 disposed in the outer cylinder 301, and a motor 303 connected to the spiral blade 302, and the outer cylinder 301 and the spiral blade 302 are made of 304 stainless steel.
It should be noted that the conveying of the high polymer polyethylene material can be realized through the spiral powder conveyor, the spiral blades are arranged inside the spiral powder conveyor, the spiral blades are driven by the motor to rotate to push the polyethylene high polymer material to be conveyed, the conveying process is stable in operation, the feeding is uniform, and the stability of the preheating device is improved.
Wherein, urceolus and helical blade's material are the stainless steel, can avoid rusty impurity to drop into the polymer polyethylene material in, improve the concentration of polymer polyethylene material, and then improve the product quality who moulds the board substrate.
Example 2
FIG. 3 shows a schematic diagram of a preheating arrangement according to an embodiment of the invention.
As shown in fig. 3, the present embodiment provides a preheating device including:
the preheating device comprises a preheating bin 1, wherein a feeding port 2 is arranged at the upper part of the preheating bin 1, a preheating module is arranged in the preheating bin 1, the bottom of the preheating bin 1 is connected with a metering and batching mixing device 4 through a spiral powder conveyor 3, and the metering and batching mixing device 4 is put into a metal mold 5 according to the requirement;
the separator 6 is arranged above the preheating bin 1;
and the air inlet of the heat exchanger 7 is communicated with the air outlet of the separator 6 through an air outlet pipeline 8, and the air outlet of the heat exchanger 7 is communicated with the preheating bin 1 through a hot air pipeline 9.
The material of the hot air duct 9 is 304 stainless steel.
It should be noted that the hot air duct 9 is made of 304 stainless steel, so that it can prevent rusty impurities from falling into the high molecular polyethylene material, and the concentration of the high molecular polyethylene material is increased, thereby improving the product quality of the sintered plate base material.
The clean air is pumped out by the separator 6 and then is transmitted into the heat exchanger 7, and is heated by the heat exchanger 7 and then is conveyed into the preheating bin 1 again to preheat the polyethylene high polymer material, so that the temperature difference between the polyethylene high polymer material and the metal mold 5 can be reduced, and the quality of the base material of the sintered plate is improved; on the other hand, the method can reduce the subsequent sintering time, is effective and energy-saving, reduces the production cost and further improves the production efficiency.
It should be noted that, the polyethylene polymer material required by the production plan is added into the preheating bin 1 through the feed inlet 2 at one time, so as to improve the working efficiency.
Wherein, preheating device still includes:
the heat preservation unit 10 is sleeved outside the preheating bin 1 and the spiral powder conveyor 3, and the heat preservation unit 10 is made of ethylene propylene diene monomer.
It should be noted that, by arranging the heat preservation unit 10 outside the preheating bin 1 and the spiral powder conveyor 3, the heat loss of the preheated polyethylene polymer material when being conveyed to the metering and blending mixing device 4 can be reduced to the minimum, so that the temperature of the polyethylene polymer material can reach more than 55 ℃ when entering the metal mold 5.
Further, the preheating module includes:
a temperature sensor (not shown) provided in the preheating compartment 1;
and the temperature control cabinet 11 is arranged outside the preheating bin 1, the temperature control cabinet 11 is respectively connected with the temperature sensor, the separator 6 and the heat exchanger 7, and the temperature control cabinet 11 controls the opening and closing of the separator 6 and the heat exchanger 7 according to the temperature of the temperature sensor.
The polyethylene high molecular material in preheating bin 1 can be guaranteed to reach the preset temperature through the setting of preheating the module, can reach more than 55 ℃ when guaranteeing follow-up entering metal mold 5, reduces the temperature between polyethylene high molecular material and the metal mold 5, guarantees to mould the product quality of burning board substrate and reduces the sintering time simultaneously, reduction in production cost, improvement production efficiency.
Further, the separator 6 includes:
the shell 601 is arranged above the preheating bin 1;
an injection pipe 602 disposed in the housing 601, the injection pipe 602 being located at an upper portion of the housing 601;
a plurality of filter cartridges 603 disposed below the injection pipe 602;
a blowing hole 604 provided in the blowing pipe 602, the blowing hole 604 corresponding to the filter cartridge 603;
a high-pressure centrifugal fan 605 arranged between the air outlet pipeline 8 and one end of the injection pipe 602;
the pulse blowing module 606 is arranged opposite to the high-pressure centrifugal fan 605, and the pulse blowing module 606 is connected with the other end of the blowing pipe 602.
When the temperature control cabinet 11 starts the separator 6 and the heat exchanger 7, the high-pressure centrifugal fan 605 of the separator 6 and the blower of the heat exchanger 7 are started, the high-pressure centrifugal fan 605 transfers the pumped clean air to the heat exchanger 7 through the air outlet pipeline 8, the air is blown into the preheating bin 1 through the blower of the heat exchanger 7 after being heated by the heat exchanger 7, the polyethylene high molecular material can be blown up to form a semi-suspension state by adjusting the frequency of the blower, and the heated air is contacted with the polyethylene high molecular material for heating.
The filter cartridge 603 is a high-precision filter cartridge, negative pressure is generated by a high-pressure centrifugal fan 605, air mixed with polyethylene high polymer materials in the preheating bin 1 passes through the high-precision filter cartridge under the action of the negative pressure, the polyethylene high polymer materials are remained on the outer surface of the high-precision filter cartridge by the high-precision filter cartridge, clean air enters a heat exchanger 7 after being blown 602 and the high-pressure centrifugal fan 605, and the polyethylene high polymer materials attached to the outer surface of the filter cartridge 603 can be shaken off at regular time through the matching arrangement of a pulse blowing module 606 and a blowing hole 604, so that the overall quality of the polyethylene high polymer materials is ensured.
Further, the pulse blowing module 606 includes:
a gas tank 6061 arranged outside the housing 601;
one end of the pulse valve 6062 is connected with the air outlet of the air storage tank 6061, the other end of the pulse valve 6062 is communicated with the blowing hole 604, and the pulse valve 6062 is fixedly connected with the shell 601 through a plate wall connector.
It should be noted that the air storage tank 6061 is fixed outside the housing 601 through the support frame, because the polyethylene polymer material attached to the surface of the filter cartridge 603 due to negative pressure is more and more accumulated along with time, the air permeability is reduced, and further the internal and external pressure difference is increased, after a pressure difference value is reached, the pulse valve 6062 is started, the pulse valve 6062 instantly releases compressed air, the compressed air is blown into the filter cartridge 603 through the blowing holes 604 on the blowing pipe 602 to form an expansion effect, the polyethylene polymer material attached to the outside of the filter cartridge 603 is shaken down to the preheating bin 1, and further the air permeability of the filter cartridge 603 is restored, and the operation is repeated in this way, wherein the air storage tank 6061 is used for storing compressed air, and is connected with the air compressor through a pipeline, so as to provide a source of compressed air during pulse blowing.
Wherein, because separator 6 and heat exchanger 7 form a confined environment in preheating device, the heating process is an inner loop process, can effectively reduce in the new trend gets into preheating storehouse 1, leads to the heat loss in preheating storehouse 1, improves polyethylene macromolecular material's preheating effect, and further, because polyethylene macromolecular material's thermal conductivity is relatively poor, only preheat through heated air circulation and can effectively improve heating efficiency.
Comparative example
FIG. 4 is a graph of a prior art stepped temperature sintering profile; FIG. 5 is a graph of a prior art interference temperature sintering curve; fig. 6 is a sintering curve diagram of a sintering method of a sintered plate substrate according to the present invention.
It should be noted that the abscissa is time in hours, and the ordinate is temperature in degrees centigrade, TPolymer materialTemperature line of polyethylene polymer material, TIn furnacesThe actual temperature profile of the hot air in the furnace is continued over time, the temperature in the furnace being provided by a temperature sensor, TSinteringThe sintering PID control temperature is set for the temperature control program, so that the air temperature in the heating furnace after program calculation has accurate temperature control capability, and the temperature overshoot condition can not be generated.
As shown in FIG. 4, when the sintering is carried out at a graded temperature, the temperature control program is set to 80 ℃, 105 ℃, 140 ℃ and 180 ℃ respectively, and the temperature is gradually increased.
The step temperature sintering is to ensure that the polyethylene high polymer material is not plasticized due to overhigh temperature by lower temperature rise, so that the porosity of the finished product is low and the air permeability is reduced, but the defects are obvious, the time consumption is too long, the energy consumption is high, the production cost is high, and the improvement of the production efficiency is not facilitated.
As shown in fig. 5, when the interference sintering is adopted, the temperature control programs are respectively set at 210 ℃, 160 ℃, 210 ℃, 170 ℃, 210 ℃ and 180 ℃, and the production time is saved by rapidly heating the metal die above and below the melting temperature of the polyethylene high polymer material.
The interference temperature sintering can effectively reduce the production time and increase the production efficiency, but because guarantee the rapid heating mould with the jump-type temperature rise and drop of the melting temperature that is higher than the material, because of the inside irregular shape of mould, isothermal time is uncontrollable, causes the local plastify phenomenon because the high temperature produces easily, leads to the finished product porosity to reduce, and the not enough waste product of ventilative volume.
As shown in fig. 6, the temperature control program was set at 220 ℃ and 185 ℃ respectively, using the pre-heating sintering method of the present application. The polyethylene high polymer material has a higher temperature rise starting point based on initial preheating of the material, so that larger time can be saved, and meanwhile, the single-point interference temperature is improved in an experiment, so that the heating program control is simpler, the temperature is set to a slightly higher sintering temperature in about 1 hour, the temperature is consistent with the set sintering temperature after the heat conduction of the metal mold, and the plasticizing phenomenon can be effectively reduced.
The preheating sintering process has the advantages that the preheating process is adopted, the temperature rise point in the sintering process is high, the temperature rise time caused by heat conduction of the die can be greatly saved, meanwhile, the temperature control program is simplified by the single-point temperature rise method, the production energy consumption and the working hour are greatly reduced, and the production efficiency is improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (9)
1. A method of sintering a sintered plate substrate, the method comprising:
based on the technical requirements of products, selecting powdery polyethylene high polymer materials with corresponding particle size ranges, and setting and testing the sintering temperature according to the process melting temperature;
adding the powdery polyethylene high polymer material into a preheating device to obtain the preheated powdery polyethylene high polymer material;
starting a spiral powder conveyor below the preheating device, conveying the preheated powdery polyethylene high polymer material to a metering and blending mixing device, simultaneously adding color master powder, a dispersing agent and an active carbon particle material into the metering and blending mixing device according to the proportion, fully mixing and filling into a metal mold;
and conveying the filled metal mold to a heating furnace, and sintering and heating according to the sintering temperature.
2. The method for sintering a sintered plate substrate according to claim 1, wherein said preheating means comprises:
the preheating bin is provided with a feeding port at the upper part and is internally provided with a preheating module, the bottom of the preheating bin is connected with the metering and batching mixing device through the spiral powder conveyor, and the metering and batching mixing device is put into the metal mold according to the requirement;
the separator is arranged above the preheating bin;
and the air inlet of the heat exchanger is communicated with the air outlet of the separator through an air outlet pipeline, and the air outlet of the heat exchanger is communicated with the preheating bin through a hot air pipeline.
3. The method of sintering a sintered plate substrate according to claim 2, wherein the separator comprises:
the shell is arranged above the preheating bin;
the blowing pipe is arranged in the shell and is positioned at the upper part of the shell;
a plurality of filter cartridges disposed below the blowing pipe;
the blowing hole is arranged in the blowing pipe and corresponds to the filter cylinder;
the high-pressure centrifugal fan is arranged between the air outlet pipeline and one end of the injection pipe;
and the pulse injection module is arranged opposite to the high-pressure centrifugal fan and is connected with the other end of the injection pipe.
4. The apparatus of claim 3, wherein the pulse-blowing module comprises:
the air storage tank is arranged outside the shell;
and one end of the pulse valve is connected with the air outlet of the air storage tank, the other end of the pulse valve is communicated with the blowing hole, and the pulse valve is fixedly connected with the shell through a plate wall connector.
5. The sintering method of the sintered plate substrate as claimed in claim 3, wherein obtaining the preheated powdery polyethylene polymer material comprises:
putting the powdery polyethylene high polymer material into a preheating bin, and starting the preheating module;
the preheating module drives the separator, the powdered polyethylene high polymer material is attached to the outside of the filter cylinder, and clean air in the preheating bin is pumped out, heated by the heat exchanger and then input into the preheating bin again;
and the polyethylene high polymer material attached to the outside of the filter cylinder is shaken off by a pulse blowing module.
6. The method of sintering a sintered plate substrate of claim 5 wherein starting the preheating module comprises:
when the temperature in the preheating bin does not reach the preset temperature, the preheating module is continuously started;
and when the temperature in the preheating bin reaches a preset temperature, stopping the preheating module and starting the spiral powder conveyor.
7. The method of claim 6, wherein the predetermined temperature is 72 ℃ to 78 ℃.
8. The method of sintering a sintered plate substrate according to any one of claims 1 to 7, wherein the melting process temperature is 180 ℃ and the sintering temperature is 177 ℃ to 183 ℃.
9. The method for sintering a sintered plate substrate according to any one of claims 1 to 7, wherein the metal mold is heated in the heating furnace at 215 ℃ to 225 ℃ for 65min and then at 180 ℃ to 190 ℃ for 60 min.
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| CN202111632847.8A CN114290700A (en) | 2021-12-29 | 2021-12-29 | Sintering method of plastic sintered plate base material |
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| CN102205651A (en) * | 2010-12-24 | 2011-10-05 | 东莞市新志密封技术有限公司 | Method for sintering polytetrafluoroethylene |
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| CN105056662A (en) * | 2015-08-23 | 2015-11-18 | 西南科技大学 | Method suitable for collecting ultrafine powder in superheated steam state and filter cartridge dust remover |
| CN110315671A (en) * | 2019-07-17 | 2019-10-11 | 广州大学 | A kind of sinter molding method of polyethylene powders |
| CN113400545A (en) * | 2021-07-26 | 2021-09-17 | 北京化工大学 | Chain type hot press molding device and method for ultrahigh molecular weight polyethylene filter element |
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2021
- 2021-12-29 CN CN202111632847.8A patent/CN114290700A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102205651A (en) * | 2010-12-24 | 2011-10-05 | 东莞市新志密封技术有限公司 | Method for sintering polytetrafluoroethylene |
| CN104385607A (en) * | 2014-09-25 | 2015-03-04 | 沈阳北阳氟塑料有限公司 | Polytetrafluoroethylene sintering apparatus and sintering method |
| CN105056662A (en) * | 2015-08-23 | 2015-11-18 | 西南科技大学 | Method suitable for collecting ultrafine powder in superheated steam state and filter cartridge dust remover |
| CN110315671A (en) * | 2019-07-17 | 2019-10-11 | 广州大学 | A kind of sinter molding method of polyethylene powders |
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