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About feed several common mold phenomenon analysis and solution
Time：
Jun 27,2023
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In the process of dealing with feed mold complaints, found that there are several kinds of mold phenomenon of the complaint is more common, the performance of: a large number of single particles of mold, dough mold, block mold, the whole package of uniform mold.
1 kind: part or the whole bag of feed is a large number of single particles of moldy feed, and sometimes there are some by a few moldy feed stuck together in a small pile, the bag of feed is hot, there is a musty smell; 2 kinds of: feed bag stitching at the mouth of the moldy feed in the form of clumps, a bag of feed within the general several, sometimes around the sporadic mildewed single particles of feed; 3 kinds of: the feed storage heap of the upper layer of the bag of feed on the day side, there are chunks of mildewed feed and the number of more, surrounded by sporadic moldy single granular feed; 4 kinds: the whole package from the inside out, uniformly moldy.
Cause analysis
Feed factory in the analysis of these kinds of feed mold phenomenon, generally go to the quality control department first to understand the moisture of the batch of products, but after understanding the results of most of the finished product moisture does not exceed the standard (≤ 12.5%), after summing up and analysis, the following conclusions:
01 Numerous quantities of single granule moldy feed occurs cause;.
a, in the case of finished product moisture does not exceed the standard, cooling tower in the pellet feed is not cooled is the main reason for the occurrence of a large number of single particle moldy feed. Because the pellet feed such as cooling tower in the cooling tower is not cooled, hot pellet feed after leaving the cooling tower, and the outside of the low-temperature air contact, hot and cold air in contact with the surface of the particles, the temperature difference so that particles of material in the hot air emitted condensation on the surface of the particles, caused by the pellet feed surface moisture elevated (so that the surface of the particles of the particles of the moisture is greater than the average moisture of the particles, the exceeding of the standard), the hot pellet feed and the outside of the greater the temperature difference between the air, the surface of the pellet feed The higher the temperature difference between the hot pellet feed and the outside air, the higher the moisture on the surface of the pellet feed; part of the high moisture particles stick together to form a small pile, after a period of time, the high surface moisture of the pellet feed in the role of mold will soon heat up, mildew, and give off a musty smell; the higher the temperature of the environment in which the batch of feed is stored, the faster the mold will change.
b, boot steam water is not discharged, resulting in the boot material moisture is too high, the granulator did not find, and then and the back of the normal material mixed together; c, puffed material at the beginning of the material or a section of the material drying is not dry, puffed chemical found, but did not make the substandard product treatment, mixed into the normal product packing; d, drying net edge or leakage of both ends, resulting in a small portion of the particles out of the drying box as early as possible.
02 The reason for the occurrence of lumpy moldy feed at the mouth of the seam.
Globular moldy feed is generally due to rain wet or moisture caused by serious.
a. Rainwater wetting
Whether it is stored or transported in the process, rainwater from the seam line into the bag, resulting in the bag mouth particles of feed inhalation of more water, part of the particles melted, 0 in the wet feed bonding and bag or outside the bag under the extrusion of feed, the formation of high moisture feed mass, after a period of time, high moisture in the mass of feed in the mold reproduces a lot, the formation of mildewed feed mass.
b. Serious moisture
Due to the high humidity in the air where the feed is stored (especially in the rainy season in the first half of the south), the moist air enters into the bag from the sewing line and contacts with the feed, resulting in elevated moisture of the pellet feed at the mouth of the bag; in some cases, the moisture in the moist air is even passed to the pellet feed at the mouth of the bag through the sewing line, which also increases the moisture of the pellet feed at the mouth of the bag. Pellet feed in such a humid environment placed in the longer, the bag mouth at the granular feed on the absorption of moisture, under certain circumstances, part of the particles melt, in the wet feed bonding and bag or outside the bag feed extrusion, the formation of high-moisture feed clusters, after a period of time, high-moisture clusters in the feed of mold reproduction, the formation of moldy feed clusters.
03 Causes of occurrence of lumpy moldy feed.
In the weather of strong sunshine, feed storage pile (transport vehicles) on the upper bagged feed and sunshine side, pellet feed in the strong sunshine, pellet feed in the high temperature of the moisture in the high temperature is evaporated, the formation of water mist in the inner membrane, especially by the sun hot pellet feed into the environment with low temperature (during the day into the night or transport feed unloaded into the room), hot and cold air in contact with the inner membrane, the temperature difference so that the hot air in the bag condensation The water mist will directly stick on the feed, causing local particle feed moisture increase, after a period of time, high moisture feed heat, into loose particles of moldy feed; serious water mist will form too much water droplets, will be around the particles of feed stick together to form a block, after a period of time, the block of high-moisture feed heat, mildew, the formation of a block of mildewed feed; solarization caused by the increase in moisture of the local particles of feed test:
a, a bag of feed, moisture 11.5%, 700g, # 3mm, basic seal.
b, with water mist
c, After 1 hour in the setting sun (starting at 4:00 p.m., about 37°C outside).
Take it indoors (about 25℃, water mist aggravated)
Cause analysis
1, there is 10-13% moisture in the pellet feed, the moisture will evaporate out at high temperature, forming water mist on the inner membrane; 2, taken into the house by the sun hot feed (or low temperature), hot and cold air in contact with the inner membrane, the temperature difference makes the hot air in the bag condense, resulting in an increase in water mist and the formation of water droplets.
Solutions
1, to prevent the occurrence of a large number of single particles of moldy feed, the main thing is to ensure that the particles of feed cooling, to ensure that the temperature of all particles under the cooling tower is not greater than the ambient temperature of 5 ℃. Can take the approach is; A, adjust the cooling tower material leveler to a reasonable height.
B, adjust the cooling tower fabricator, unloader, to maintain the basic level of the material layer in the cooling tower; C, equipped with the appropriate specifications of the cooling tower, cooling fan and reasonable control of the size of the fan dampers; D, strengthen the drainage confirmation of the person, by the head of the band shift to confirm that the normal, before use; or test (5 minutes) after the moisture of semi-finished products after the tempering to confirm that the normal and then normal into production.
2, to prevent the occurrence of seam at the mouth of the dough moldy feed, general feed mill labels do a very clear description of the approach is as follows; A, to prevent rain, water, moisture absorption; A, to prevent rain, water, moisture absorption; A, to prevent rain, water, moisture absorption; B, storage in a ventilated, dry clean feed, and then use it.
B, stored in a ventilated, dry and clean place.
Prevent the occurrence of lumpy moldy feed, mainly stored feed products can not be sunlight. In addition, the vehicle in the high temperature, strong sunshine weather delivery bagged feed, especially when the transport distance is relatively far, need to cover the tarpaulin shade, heat insulation.
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