Supported Materials
Food & agricultural products drying equipment selection: form, heat sensitivity and recommended machine for 29 materials (Starch, Corn starch, Wheat flour and others), with the full line configuration and trial run points.
All
Chemical raw materials
Fine chemicals & pigments
Pharmaceuticals & herbal medicine
Pesticides & fertilisers
Inorganic salts
New energy & battery materials
Metallurgy & metal powders
Building materials & minerals
Feed & livestock
Food & agricultural products
Environmental & biomass
Plastics & rubber
Paper & printing
29 material(s) listed for this industry.
Food & agricultural products 29 items
| Material | Form | Heat sensitivity | Recommended dryer | Alternative | Selection notes |
|---|---|---|---|---|---|
| Starch | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
There is one hard limit in starch drying: gelatinization. Once the moisture inside a starch granule reaches a certain fraction, the granule takes in water, swells and its structure breaks down, and after gelatinization it cannot be reversed — what comes out is a viscous paste rather than a powder. Starch is therefore rated at the highest heat sensitivity level and the process only works on a flash airflow line, where the water is taken out in the seconds before gelatinization can start. Our configuration works backwards from the material temperature: the hot air can run at 180 to 200°C and the residence time is only a few seconds, so as long as the moisture comes off fast enough the material temperature never reaches the gelatinization point. Starch also has a characteristic that matters here: gelatinization temperatures differ widely by species — cassava, corn and wheat starch are not the same — so the set temperature cannot simply be copied from another batch and has to follow the incoming test data. Storage matters just as much: starch takes on moisture very quickly, and once it cakes and turns sticky the drying has been wasted.
Detail →
|
| Corn starch | Powder | Heat-sensitive | Flash Airflow Dryer |
This is the same category as starch, with the same gelatinization limit, but corn starch normally arrives at a lower moisture than cassava starch, so the feed section is steadier and the bridging risk is smaller. Our configuration is the same flash airflow line, with two differences: the residence time can be a little shorter, because the gelatinization temperature of corn starch is slightly higher than cassava and the process window is comparatively wider; and the air volume can be more generous, because corn starch has a relatively narrow size distribution and pneumatic classification works cleanly, so a cyclone at the tail end can recover the fines separately and give both a dry powder and a reusable fine fraction. Modified starch and pre-gelatinized starch are two different stories. Modified starch has been chemically treated and is more heat tolerant, so it can take a hotter process. Pre-gelatinized starch has already been gelatinized, so our approach is not to dry it at all but to spray dry it into granules — the route has to be confirmed with the supplier.
Detail →
|
|
| Wheat flour | Powder | Heat-sensitive | Flash Airflow Dryer |
Excessive heat affects the gluten; hold the temperature steady. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Send a sample with the enquiry. The moisture and bulk density of the actual wheat flour decide the machine size far more than the name does.
|
|
| Dehydrated vegetables | Flake | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Shade and rehydration are the priority; short exposure helps hold the colour. Flakes are not afraid of heat, they are afraid of being crushed and folded; every contact between equipment and material can leave a reject. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Flakes that dry too fast curl up, so temperature and air volume have to be set apart: hold the temperature first, then raise the air volume slowly. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for dehydrated vegetables, because two materials of the same form can differ by a whole machine size.
|
| Tea leaves | Flake | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Flavour compounds are heat-sensitive; short exposure better retains the aroma. Thin flakes transfer heat quickly and can be dried hard, but the price is tighter demand on air velocity and on temperature uniformity. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Flakes that dry too fast curl up, so temperature and air volume have to be set apart: hold the temperature first, then raise the air volume slowly. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for tea leaves, because two materials of the same form can differ by a whole machine size.
|
| Chilli powder | Powder | Heat-sensitive | Flash Airflow Dryer | Batch Rotary Dryer |
Colour and pungency are heat-sensitive; shorten the exposure. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for chilli powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
|
| White sugar | Granular | Heat-sensitive | Flash Airflow Dryer | Batch Rotary Dryer |
Excessive heat causes caking or discolouration. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Granules dry on the surface long before the inside is done, so final moisture has to mean moisture throughout, not just a dry shell. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. Send a sample with the enquiry. The moisture and bulk density of the actual white sugar decide the machine size far more than the name does.
|
| MSG | Granular | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Hygroscopic; pack immediately after discharge. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Granules dry on the surface long before the inside is done, so final moisture has to mean moisture throughout, not just a dry shell. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for MSG by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
|
| Rice bran | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Fat content turns rancid; dry quickly at low temperature. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for rice bran, because two materials of the same form can differ by a whole machine size.
|
| Cassava flour | Powder | Heat-sensitive | Flash Airflow Dryer |
Heat-sensitive, suited to flash drying. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for cassava flour, because two materials of the same form can differ by a whole machine size.
|
|
| Spent mushroom substrate | Granular | Not heat-sensitive | Rotary Dryer | Batch Rotary Dryer |
High moisture; dewater before thermal drying. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. If the incoming grade of spent mushroom substrate is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
|
| Potato starch | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Heat-sensitive and prone to gelatinisation; flash drying is the safer route. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of potato starch is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
|
| Sweet potato starch | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
As for starch; cap the material temperature. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for sweet potato starch by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
|
| Wheat starch | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Control temperature to prevent gelatinisation and caking. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of wheat starch is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
|
| Pea starch | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Heat-sensitive; shorten the exposure. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of pea starch is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
|
| Mung bean starch | Powder | Heat-sensitive | Flash Airflow Dryer | Batch Rotary Dryer |
Batches tend to be small; batch operation gives more flexible temperature control. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for mung bean starch by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
|
| Modified starch | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Excessive heat damages the modified functionality; hold the temperature steady. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for modified starch, because two materials of the same form can differ by a whole machine size.
|
| Pregelatinised starch | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Narrow process temperature window; close temperature control required. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for pregelatinised starch, because two materials of the same form can differ by a whole machine size.
|
| Glutinous rice flour | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Sticky; preventing wall build-up and disintegration must be considered together. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for glutinous rice flour by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
|
| Canna starch | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Heat-sensitive, suited to flash drying. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of canna starch is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
|
| Kudzu starch | Powder | Heat-sensitive | Flash Airflow Dryer | Batch Rotary Dryer |
High value in small batches; batch temperature control preserves quality. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for kudzu starch by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
|
| Soy protein | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Protein is heat-sensitive; exposure measured in seconds. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of soy protein is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
|
| Lactose | Powder | Moderate | Flash Airflow Dryer | Rotary Dryer |
Picks up moisture and cakes; pack promptly after drying. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual lactose decide the machine size far more than the name does.
|
| Maltodextrin | Powder | Moderate | Flash Airflow Dryer | Rotary Dryer |
Hygroscopic; control temperature to avoid caking. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for maltodextrin, because two materials of the same form can differ by a whole machine size.
|
| Egg yolk powder | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Heat-sensitive; short exposure preserves flavour. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for egg yolk powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
|
| Instant coffee | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Flavour compounds are heat-sensitive; short exposure. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for instant coffee, because two materials of the same form can differ by a whole machine size.
|
| Yeast extract | Powder | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Heat-sensitive; control temperature to protect flavour. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for yeast extract, because two materials of the same form can differ by a whole machine size.
|
| Caramel colour | Powder | Moderate | Flash Airflow Dryer | Rotary Dryer |
Pigment powder; temperature control. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for caramel colour, because two materials of the same form can differ by a whole machine size.
|
| Gelatine sheet | Flake | Heat-sensitive | Flash Airflow Dryer | Electric Heating Dryer |
Heat-sensitive flakes; residence measured in seconds better preserves gel strength. Flakes bridge easily, so the feed section needs a disintegrator or forced feeding; once the material balls up and blocks the inlet, the best hot air in the building is wasted. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Flakes that dry too fast curl up, so temperature and air volume have to be set apart: hold the temperature first, then raise the air volume slowly. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for gelatine sheet, because two materials of the same form can differ by a whole machine size.
|
Recommendations above are a selection direction based on material form, heat sensitivity and throughput. Capacity varies with the material, the initial moisture content and the target final moisture, and the formal figures come from a trial run.
Four steps to a selectionHow to choose
- Material form Powder, granule and flake material can be carried in an air stream; blocky, paste-like and fibrous material has to be tumbled inside a drum.
- Heat sensitivity This comes first. Where the material is heat-sensitive and its form allows air conveying, a flash airflow dryer is the natural choice — regardless of output, because exposure to heat is measured in seconds. Material that tolerates heat can be dried more slowly and at lower cost.
- Throughput and budget Where budget and batch size matter more than output, a batch rotary dryer carries relatively low capital cost and suits a small plant or workshop. For high output, a continuous rotary dryer feeds and discharges at the same time and runs non-stop.
- Environment and energy Where emissions are constrained or there is no steam supply, electric and electromagnetic heating avoids an open flame and responds faster.
Where the material is corrosive (acidic, chloride-bearing, saline and so on), the parts in contact can be specified in stainless steel: 201 / 304 / 316L / 430 / 2205 duplex and other grades to order.
Need a selection based on your material?
Tell us the material, initial moisture content and target final moisture, and we will propose a configuration that fits.
+8615238028609
Material · Selection · Trial run