The local moisture of the finished product exceeded the standard. Local moisture exceeding the standard has a certain concealment, it is difficult to find difficult to control. It is the main cause of mildew caused by excessive moisture. According to the long-term observation, the following conditions may cause the local moisture of the feed to exceed the standard.
(1) There is no problem with the technical status of the equipment and the production operation. The initial moisture of the raw materials also meets the requirements. However, each batch of materials is produced at the beginning of production due to the low quenching temperature and the deposition of a certain amount of condensed water in the steam line. The granules have higher moisture content, lower temperature, and the cooler temperature is lower than that of water molecules, which is not easy to disperse. After cooling, this part of the particles will often exceed the water. Solution: Before the production, the condensate of the steam system should be drained. The material just emerging from the granulator must be taken out. It must not be placed in the cooler until the quenching temperature reaches about 50 °C before the material can be introduced into the cooler. When receiving materials, the first 2-4 packets of each batch should be taken out for processing.
(2) Unreasonable equipment adjustment or equipment failure: Most of the feed mill cooling process design is: the cyclone dust collector separates and recycles the material, does not return to the grain storage bin through a special hoist, but directly enters the finished product lifting machine. The moisture of the powder separated by the dust collector will not exceed the standard (the powder will be sieved out when the powder passes through the grading sieve), but if the "level switch" of the cooler is set too high, the cooler cannot be properly discharged due to the failure or the cooler The granules that have just been granulated are sucked into the cyclone by the negative pressure of the outlet, etc., and the granules are not sufficiently cooled and dried, and are separated into the finished granulator and mixed into the normal granules. There is also a case where the cooler is unreasonably adjusted or the positioning switch is faulty, and the material is leaked during the production process, and the leaked portion is not sufficiently cooled and dried. These materials will be mildewed in a short period of time, and their performance will be zero-star mildew, and will continue to develop into a large area of ​​mold, insects and fever in the bag. The solution is: a, select sensitive and reliable "level sensor" and positioning switch; b, "level position" height can not be adjusted too high; c, adjust the fan opening of the damper, control the cooler air outlet Negative pressure. d. The angle of the flap of the cooler or the overlap of the fence should be adjusted so that the ventilation area is too narrow and the material leakage during production is avoided.
(3) Uneven internal load of the cooler: uneven material of the cooler, uneven discharge of the cloth, or insufficient airflow area of ​​the individual cooler flap due to the screen hole; the cooling time and cooling of the feed in the cooler The intensity is not uniform. Part of the material is not wet and heat exchanged, and the moisture exceeds the standard. Sporadic mildew is produced in later storage. The solution is to clear the clogging feed in the sieve hole by adjusting the angle of the bulker, the distributor and the flap to make the feed cooling time and cooling intensity in the cooler consistent.
(4) Mildew caused by “pot material†produced by granulator and cooler: in the production process, the ring mold cover of the granulator, the blanking pipe of the granulator, and the dead angle of the cooler will be adsorbed. A large amount of high-moisture “pots and materials†will fall into the feed when they are adsorbed to a certain thickness. Because of the high temperature and high humidity environment in the formation process, the starch gelatinization degree is very high and the color depth is deep, which creates favorable conditions for the reproduction of mold, and they have been mildewed and deteriorated before falling into the feed. After cooling with the feed, the moisture is still as high as 15%-25%. When these "pots and materials" pass through the conveying equipment and the grading sieve, some of them will be broken into large and small irregular blocks, and the large blocks of these blocks cannot be removed as debris by the upper sieve which cannot pass through the grading sieve; The smaller block material is mixed into the feed through the upper screen of the sieving screen. These moldy, high-moisture bulk materials are prone to induce moldy changes in the surrounding feed particles. The solution is to remove the "pot material" adsorbed on the equipment of the granulator's ring mold cover, the granulator's blanking tube, the cooler's dead angle, etc., to prevent it from accumulating thick and falling into the feed.
(5), finished product packaging: If the packaging bag can not be wet and moisture-proof, the feed will absorb moisture during storage, and the moisture will increase after moisture absorption, which is prone to mildew. Sichuan's feed mills often encounter such complaints during the summer: the feed stored in the customer's home for about 35 days depends on the feed of the seams, which is mildew, fever and insects. For the finished packaging requirements, the first one is the packaging bag, the inner and outer bags are intact and not damaged, and the second is to fold the seam when the seam is to be used to reduce the contact of the feed with outside air.
(6), choose a reasonable anti-fungal agent: add appropriate amount of high-quality anti-fungal agent in the production, can effectively inhibit the growth of mold, and prolong the preservation time of the feed.
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