CN103808108A - Low-temperature drying method of low-melting-point resin - Google Patents
Low-temperature drying method of low-melting-point resin Download PDFInfo
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- CN103808108A CN103808108A CN201310577301.6A CN201310577301A CN103808108A CN 103808108 A CN103808108 A CN 103808108A CN 201310577301 A CN201310577301 A CN 201310577301A CN 103808108 A CN103808108 A CN 103808108A
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- 238000001035 drying Methods 0.000 title claims abstract description 63
- 239000011347 resin Substances 0.000 title claims abstract description 17
- 229920005989 resin Polymers 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000004744 fabric Substances 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 136
- 239000012530 fluid Substances 0.000 claims description 25
- 238000000926 separation method Methods 0.000 claims description 22
- 238000009288 screen filtration Methods 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 230000003068 static effect Effects 0.000 claims description 10
- 239000008187 granular material Substances 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 5
- 238000003303 reheating Methods 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 4
- 238000009835 boiling Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 238000007791 dehumidification Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 238000007605 air drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
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Abstract
The invention relates to a drying method, in particular to a low-temperature drying method of low-melting-point resin, and the method is particularly suitable for drying of resin whose melting point is lower than the boiling point of water. The low-temperature drying method of the low-melting-point resin comprises the steps as follows: screen cloth filtering; centrifugal drying and dehumidification drying; heating and temperature-control drying; and package sealing and checking. With the adoption of the low-temperature drying method of the low-melting-point resin, the subsequent product quality is improved, and the drying efficiency is high.
Description
Technical field
The present invention relates to a kind of drying means, relate in particular to a kind of low temperature drying method of low-melting-point resin, be particularly useful for the resin drying of fusing point lower than the boiling point of water.
Background technology
Material is resin especially, can be because a variety of causes absorb moisture, and affect the use of material or effectively store, therefore, need to be dried material.
Traditional dry technology is divided into the dry of evaporation mode, and as high temperature drying, forced air drying, also comprises the drying mode of both combinations.Special drying means has vacuum drying, desiccant dryness etc.For runny material, adopt the mode of filtration or centrifugation to be slightly dried.
Except filtering or over centrifugation mode divides aqueous water and dry thing, other modes all need to adopt the dry thing that is dried of method of gasification.The principle adopting is that the thing that is dried is positioned in the environment of certain temperature and humidity, utilizes at this temperature, and the humidity of environment is less than Saturated water vapor pressure, progressively vapors away surperficial adsorbed water.
But, for low melting material, or require baking temperature compared with low material, adopt the high and dry mode of high temperature can destroy performance or the physical arrangement of material, cause materials'use condition to change, may affect use, such as, for the EVA resin making moist, adopt high temperature process material to be easily bonded to piece, cannot carry out following process.
Low temperature forced air drying just becomes a kind of option, but, under the lower environmental condition of the larger temperature of humidity, the drying effect of moisture tends to have a greatly reduced quality, even, under the saturated steam damp condition of low temperature, forced air drying has lost dry ability, cannot carry out efficient drying.
Summary of the invention
The present invention solves the deficiencies in the prior art, and a kind of systematization drying mode that adopts is provided, and makes drying efficiency high, the low temperature drying method of the low-melting-point resin that drying effect improves greatly simultaneously.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
A low temperature drying method for low-melting-point resin, carries out according to the following steps:
(1), material screen net filtration:
Use screen cloth to filter for the high material of water content or granular material, after screen filtration, make the water content of material be no more than 5%;
The order number of screen cloth is 5 order～50 orders, and the time of screen filtration is 5 seconds～600 seconds;
Screen cloth is continous way or discontinuous mode; Continous way refers to that screen cloth enters other end from this head and goes out, and material is flowing with flowing water is equally continuous; Discontinuous formula is outwelled and is changed one basket of new material again after referring to and completing with fixing one basket of operation of basket formula sieve;
Screen filtration can be removed the water content exceeding more than 5% preferably, reaches water is tentatively filtered to object.
(2), high wind is carried:
High wind is carried and is adopted stainless steel drum blower fan, and wind speed is 8 meter per second～30 meter per seconds; Air-source is room air, and temperature is no more than 35 ℃, and relative humidity is no more than 70%;
High wind is carried and is guaranteed the transfer of material, and material surface moisture is carried out to a certain degree dry.
(3), cyclonic separation:
Adopt cyclone separator to separate, after material is carried by high wind, enter barrel and carry out cyclonic separation, further dried material; The diameter of cyclone separator is 0.5～2 meter, is highly 0.5～2 meter;
Cyclonic separation has cushioned the speed of charging effectively, and certain material storage storage guarantees the quantity of charging and stable speed.While is further dried material also.
(4), centrifugal drying:
Material after step (3), uses centrifuge to carry out centrifugal drying, and the rotating speed of centrifuge is more than 1500 revs/min, makes the water content of material be no more than 0.8%, and be no more than 5 minutes the drying time of centrifuge, and the temperature in centrifuge is no more than 60 ℃;
Centrifugal drying further dewaters to material, makes the water content of material be no more than 0.8%.
(5), removal moisture drying:
1., remove airborne condensed water: adopt condenser or condensing plant, airborne moisture is dehumidified, equipment design temperature is-5～5 ℃, equipment surface temperature and determining, surface temperature is 0～10 ℃, the temperature of corresponding cooling-air is 0～10 ℃, at this temperature, corresponding water saturation vapour pressure is no more than 1000Pa, unnecessary moisture is liquefied on the fin of condenser, fin is through hydrophobization processing, after forming moisture film, go downstream, remove unnecessary moisture, the air of removing condensed water is transported in heat-exchanger rig through airduct through condensing plant;
2., air heat: the air being input in heat-exchanger rig is heated, and more than making atmosphere temperature rising to 20 ℃, when heat drying, air is flow at high speed operation continuously, and the flow velocity of air is 8 meter per second～30 meter per seconds;
3., cyclonic separation:
Material enters in cyclone separator, enters barrel and carries out cyclonic separation, further dried material; The diameter of cyclone separator is 0.5～2 meter, is highly 0.5～2 meter;
Cyclonic separation has cushioned the speed of charging effectively, and certain material storage storage guarantees the quantity of charging and stable speed.
(6), heated for controlling temperature is dry: dry air after step (5) is processed, through and reheating, temperature is no more than 60 ℃, the material of dried air after to step (5) is dried:
Adopt dry static material: the material in step (5) is stacked, the thickness of stacking is no more than 8 times of particle diameter, material is placed in channel-style closed area, the area of channel-style closed area is 0.5 square meter～60 square meter, allow dry air pass through fast from particle surface, the Negotiation speed of air is 4 meter per second～30 meter per seconds, and the time is no more than 4 hours;
Or,
Employing penetrates static material and is dried: the material in step (5) is placed in the clean container with filter mesh, the order number of mesh is 5 order～50 orders, clean container is located in channel-style closed area, the area of channel-style closed area is 0.5 square meter～60 square meter, dry air enters through material from one, go out to other end, the time is no more than 4 hours;
Or,
Adopt drying fluidized-bed material: the material blanking in step (5) is entered to fluid bed, fluid bed is located in channel-style closed area, the area of channel-style closed area is 0.5 square meter～60 square meter, and dry air penetration fluid bed, is dried processing to material; The order number of fluid bed is 5 order～50 orders; The fluid bed time of staying is no more than 10 minutes;
Heating temperature control is dry, no matter adopts which kind of mode, and object is to increase the degree of drying of air, increases the effect of dehumidifying, and wherein, fluidized bed drying can be realized quantity-produced object preferably.
(7), pack and check:
Dry complete material packs, and material is tested, and the humidity of material is no more than 0.08%.
Equipment surface temperature and determining, surface temperature is 0～10 ℃, the temperature of corresponding cooling-air is 0～10 ℃ and refers to that condenser is set as the temperature of internal cooling medium, there is certain temperature difference to equipment surface, so surface temperature is 0～10 ℃, and air directly contacts with surface, the temperature cooling down is also 0～10 ℃ of scope.
The low temperature drying method of low-melting-point resin provided by the invention, promotes subsequent product quality, and drying efficiency is high.
The specific embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1: a kind of low temperature drying method of low-melting-point resin, carries out according to the following steps:
(1), material screen net filtration:
Use screen cloth to filter for the high material of water content or granular material, after screen filtration, make the water content of material be no more than 5%;
The order number of screen cloth is 5 orders, and the time of screen filtration is 5 seconds;
Screen cloth is continous way or discontinuous mode; Continous way refers to that screen cloth enters other end from this head and goes out, and material is flowing with flowing water is equally continuous; Discontinuous formula is outwelled and is changed one basket of new material again after referring to and completing with fixing one basket of operation of basket formula sieve;
(2), high wind is carried:
High wind is carried and is adopted stainless steel drum blower fan, and wind speed is 8 meter per seconds; Air-source is room air, and temperature is no more than 35 ℃, and relative humidity is no more than 70%;
(3), cyclonic separation:
Adopt cyclone separator to separate, after material is carried by high wind, enter barrel and carry out cyclonic separation, further dried material; The diameter of cyclone separator is 0.5, is highly 0.5 meter;
(4), centrifugal drying:
Material after step (3), uses centrifuge to carry out centrifugal drying, and the rotating speed of centrifuge is more than 1500 revs/min, makes the water content of material be no more than 0.8%, and be no more than 5 minutes the drying time of centrifuge, and the temperature in centrifuge is no more than 60 ℃;
(5), removal moisture drying:
1., remove airborne condensed water: adopt condenser or condensing plant, airborne moisture is dehumidified, equipment design temperature is-5 ℃, equipment surface temperature and determining, surface temperature is 0 ℃, the temperature of corresponding cooling-air is 0 ℃, at this temperature, corresponding water saturation vapour pressure is no more than 1000Pa, unnecessary moisture is liquefied on the fin of condenser, fin is through hydrophobization processing, after forming moisture film, go downstream, remove unnecessary moisture, the air of removing condensed water is transported in heat-exchanger rig through airduct through condensing plant;
2., air heat: the air being input in heat-exchanger rig is heated, and more than making atmosphere temperature rising to 20 ℃, when heat drying, air is flow at high speed operation continuously, and the flow velocity of air is 8 meter per seconds;
3., cyclonic separation:
Material enters in cyclone separator, enters barrel and carries out cyclonic separation, further dried material; The diameter of cyclone separator is 0.5 meter, is highly 0.5 meter;
(6), heated for controlling temperature is dry: dry air after step (5) is processed, through and reheating, temperature is no more than 60 ℃, the material of dried air after to step (5) is dried:
Adopt dry static material: the material in step (5) is stacked, the thickness of stacking is no more than 8 times of particle diameter, material is placed in channel-style closed area, the area of channel-style closed area is 0.5 square meter, allow dry air pass through fast from particle surface, the Negotiation speed of air is 4 meter per seconds, and the time is no more than 4 hours;
Or,
Employing penetrates static material and is dried: the material in step (5) is placed in the clean container with filter mesh, the order number of mesh is 5 orders, clean container is located in channel-style closed area, the area of channel-style closed area is 0.5 square meter, dry air enters through material from one, go out to other end, the time is no more than 4 hours;
Or,
Adopt drying fluidized-bed material: the material blanking in step (5) is entered to fluid bed, and fluid bed is located in channel-style closed area, and the area of channel-style closed area is 0.5 square meter, and dry air penetration fluid bed, is dried processing to material; The order number of fluid bed is 5 orders; The fluid bed time of staying is no more than 10 minutes;
(7), pack and check:
Dry complete material packs, and material is tested, and the humidity of material is no more than 0.08%.
Embodiment 2: a kind of low temperature drying method of low-melting-point resin, carries out according to the following steps:
(1), material screen net filtration:
Use screen cloth to filter for the high material of water content or granular material, after screen filtration, make the water content of material be no more than 5%;
The order number of screen cloth is 20 orders, and the time of screen filtration is 200 seconds;
Screen cloth is continous way or discontinuous mode; Continous way refers to that screen cloth enters other end from this head and goes out, and material is flowing with flowing water is equally continuous; Discontinuous formula is outwelled and is changed one basket of new material again after referring to and completing with fixing one basket of operation of basket formula sieve;
(2), high wind is carried:
High wind is carried and is adopted stainless steel drum blower fan, and wind speed is 15 meter per seconds; Air-source is room air, and temperature is no more than 35 ℃, and relative humidity is no more than 70%;
(3), cyclonic separation:
Adopt cyclone separator to separate, after material is carried by high wind, enter barrel and carry out cyclonic separation, further dried material; The diameter of cyclone separator is 1 meter, is highly 1 meter;
(4), centrifugal drying:
Material after step (3), uses centrifuge to carry out centrifugal drying, and the rotating speed of centrifuge is more than 1500 revs/min, makes the water content of material be no more than 0.8%, and be no more than 5 minutes the drying time of centrifuge, and the temperature in centrifuge is no more than 60 ℃;
(5), removal moisture drying:
1., remove airborne condensed water: adopt condenser or condensing plant, airborne moisture is dehumidified, equipment design temperature is 2 ℃, equipment surface temperature and determining, surface temperature is 5 ℃, the temperature of corresponding cooling-air is 5 ℃, at this temperature, corresponding water saturation vapour pressure is no more than 1000Pa, unnecessary moisture is liquefied on the fin of condenser, fin is through hydrophobization processing, after forming moisture film, go downstream, remove unnecessary moisture, the air of removing condensed water is transported in heat-exchanger rig through airduct through condensing plant;
2., air heat: the air being input in heat-exchanger rig is heated, and more than making atmosphere temperature rising to 20 ℃, when heat drying, air is flow at high speed operation continuously, and the flow velocity of air is 15 meter per seconds;
3., cyclonic separation:
Material enters in cyclone separator, enters barrel and carries out cyclonic separation, further dried material; The diameter of cyclone separator is 1 meter, is highly 1 meter;
(6), heated for controlling temperature is dry: dry air after step (5) is processed, through and reheating, temperature is no more than 60 ℃, the material of dried air after to step (5) is dried:
Adopt dry static material: the material in step (5) is stacked, the thickness of stacking is no more than 8 times of particle diameter, material is placed in channel-style closed area, the area of channel-style closed area is 30 square meters, allow dry air pass through fast from particle surface, the Negotiation speed of air is 15 meter per seconds, and the time is no more than 4 hours;
Or,
Employing penetrates static material and is dried: the material in step (5) is placed in the clean container with filter mesh, the order number of mesh is 20 orders, clean container is located in channel-style closed area, the area of channel-style closed area is 30 square meters, dry air enters through material from one, go out to other end, the time is no more than 4 hours;
Or,
Adopt drying fluidized-bed material: the material blanking in step (5) is entered to fluid bed, and fluid bed is located in channel-style closed area, and the area of channel-style closed area is 30 square meters, and dry air penetration fluid bed, is dried processing to material; The order number of fluid bed is 20 orders; The fluid bed time of staying is no more than 10 minutes;
(7), pack and check:
Dry complete material packs, and material is tested, and the humidity of material is no more than 0.08%.
Embodiment 3: a kind of low temperature drying method of low-melting-point resin, carries out according to the following steps:
(1), material screen net filtration:
Use screen cloth to filter for the high material of water content or granular material, after screen filtration, make the water content of material be no more than 5%;
The order number of screen cloth is 50 orders, and the time of screen filtration is 600 seconds;
Screen cloth is continous way or discontinuous mode; Continous way refers to that screen cloth enters other end from this head and goes out, and material is flowing with flowing water is equally continuous; Discontinuous formula is outwelled and is changed one basket of new material again after referring to and completing with fixing one basket of operation of basket formula sieve;
(2), high wind is carried:
High wind is carried and is adopted stainless steel drum blower fan, and wind speed is 30 meter per seconds; Air-source is room air, and temperature is no more than 35 ℃, and relative humidity is no more than 70%;
(3), cyclonic separation:
Adopt cyclone separator to separate, after material is carried by high wind, enter barrel and carry out cyclonic separation, further dried material; The diameter of cyclone separator is 2 meters, is highly 2 meters;
(4), centrifugal drying:
Material after step (3), uses centrifuge to carry out centrifugal drying, and the rotating speed of centrifuge is more than 1500 revs/min, makes the water content of material be no more than 0.8%, and be no more than 5 minutes the drying time of centrifuge, and the temperature in centrifuge is no more than 60 ℃;
(5), removal moisture drying:
1., remove airborne condensed water: adopt condenser or condensing plant, airborne moisture is dehumidified, equipment design temperature is 5 ℃, equipment surface temperature and determining, surface temperature is 10 ℃, the temperature of corresponding cooling-air is 10 ℃, at this temperature, corresponding water saturation vapour pressure is no more than 1000Pa, unnecessary moisture is liquefied on the fin of condenser, fin is through hydrophobization processing, after forming moisture film, go downstream, remove unnecessary moisture, the air of removing condensed water is transported in heat-exchanger rig through airduct through condensing plant;
2., air heat: the air being input in heat-exchanger rig is heated, and more than making atmosphere temperature rising to 20 ℃, when heat drying, air is flow at high speed operation continuously, and the flow velocity of air is 30 meter per seconds;
3., cyclonic separation:
Material enters in cyclone separator, enters barrel and carries out cyclonic separation, further dried material; The diameter of cyclone separator is 2 meters, is highly 2 meters;
(6), heated for controlling temperature is dry: dry air after step (5) is processed, through and reheating, temperature is no more than 60 ℃, the material of dried air after to step (5) is dried:
Adopt dry static material: the material in step (5) is stacked, the thickness of stacking is no more than 8 times of particle diameter, material is placed in channel-style closed area, the area of channel-style closed area is 60 square meters, allow dry air pass through fast from particle surface, the Negotiation speed of air is 30 meter per seconds, and the time is no more than 4 hours;
Or,
Employing penetrates static material and is dried: the material in step (5) is placed in the clean container with filter mesh, the order number of mesh is 50 orders, clean container is located in channel-style closed area, the area of channel-style closed area is 60 square meters, dry air enters through material from one, go out to other end, the time is no more than 4 hours;
Or,
Adopt drying fluidized-bed material: the material blanking in step (5) is entered to fluid bed, fluid bed is located in channel-style closed area, the area of channel-style closed area for depending on treating capacity be 60 square meters not etc., dry air penetration fluid bed, is dried processing to material; The order number of fluid bed is 50 orders; The fluid bed time of staying is no more than 10 minutes;
(7), pack and check:
Dry complete material packs, and material is tested, and the humidity of material is no more than 0.08%.
Claims (1)
1. a low temperature drying method for low-melting-point resin, is characterized in that carrying out according to the following steps:
(1), material screen net filtration:
Use screen cloth to filter for the high material of water content or granular material, after screen filtration, make the water content of material be no more than 5%;
The order number of screen cloth is 5 order～50 orders, and the time of screen filtration is 5 seconds～600 seconds;
Screen cloth is continous way or discontinuous mode; Continous way refers to that screen cloth enters other end from this head and goes out, and material is flowing with flowing water is equally continuous; Discontinuous formula is outwelled and is changed one basket of new material again after referring to and completing with fixing one basket of operation of basket formula sieve;
(2), high wind is carried:
High wind is carried and is adopted stainless steel drum blower fan, and wind speed is 8 meter per second～30 meter per seconds; Air-source is room air, and temperature is no more than 35 ℃, and relative humidity is no more than 70%;
(3), cyclonic separation:
Adopt cyclone separator to separate, after material is carried by high wind, enter barrel and carry out cyclonic separation, further dried material; The diameter of cyclone separator is 0.5～2 meter, is highly 0.5～2 meter;
(4), centrifugal drying:
Material after step (3), uses centrifuge to carry out centrifugal drying, and the rotating speed of centrifuge is more than 1500 revs/min, makes the water content of material be no more than 0.8%, and be no more than 5 minutes the drying time of centrifuge, and the temperature in centrifuge is no more than 60 ℃;
(5), removal moisture drying:
1., remove airborne condensed water: adopt condenser or condensing plant, airborne moisture is dehumidified, equipment design temperature is-5～5 ℃, equipment surface temperature and determining, surface temperature is 0～10 ℃, the temperature of corresponding cooling-air is 0～10 ℃, at this temperature, corresponding water saturation vapour pressure is no more than 1000Pa, unnecessary moisture is liquefied on the fin of condenser, fin is through hydrophobization processing, after forming moisture film, go downstream, remove unnecessary moisture, the air of removing condensed water is transported in heat-exchanger rig through airduct through condensing plant;
2., air heat: the air being input in heat-exchanger rig is heated, and more than making atmosphere temperature rising to 20 ℃, when heat drying, air is flow at high speed operation continuously, and the flow velocity of air is 8 meter per second～30 meter per seconds;
3., cyclonic separation:
Material enters in cyclone separator, enters barrel and carries out cyclonic separation, further dried material; The diameter of cyclone separator is 0.5～2 meter, is highly 0.5～2 meter;
(6), heated for controlling temperature is dry: dry air after step (5) is processed, through and reheating, temperature is no more than 60 ℃, the material of dried air after to step (5) is dried:
Adopt dry static material: the material in step (5) is stacked, the thickness of stacking is no more than 8 times of particle diameter, material is placed in channel-style closed area, the area of channel-style closed area is 0.5 square meter～60 square meter, allow dry air pass through fast from particle surface, the Negotiation speed of air is 4 meter per second～30 meter per seconds, and the time is no more than 4 hours;
Or,
Employing penetrates static material and is dried: the material in step (5) is placed in the clean container with filter mesh, the order number of mesh is 5 order～50 orders, clean container is located in channel-style closed area, the area of channel-style closed area is 0.5 square meter～60 square meter, dry air enters through material from one, go out to other end, the time is no more than 4 hours;
Or,
Adopt drying fluidized-bed material: the material blanking in step (5) is entered to fluid bed, fluid bed is located in channel-style closed area, the area of channel-style closed area is 0.5 square meter～60 square meter, and dry air penetration fluid bed, is dried processing to material; The order number of fluid bed is 5 order～50 orders; The fluid bed time of staying is no more than 10 minutes;
(7), pack and check:
Dry complete material packs, and material is tested, and the humidity of material is no more than 0.08%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104401097A (en) * | 2014-10-31 | 2015-03-11 | 重庆和泰塑胶股份有限公司 | Method using water-soluble glue for making composite film |
| CN105910391A (en) * | 2016-04-14 | 2016-08-31 | 吉林大学 | Screen-type combined air drying method |
| CN108180700A (en) * | 2017-12-22 | 2018-06-19 | 西安近代化学研究所 | A kind of drying means of easy distillation organic solid powder |
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| CN201964740U (en) * | 2011-03-08 | 2011-09-07 | 常州先锋干燥设备有限公司 | Rotary flash-drying unit |
Cited By (6)
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