Compared with livestock and poultry feed, fish and shrimp feed has more special requirements for processing granulation. It is generally required that the fish feed pellets have a water resistance of ≥ 0.5 hours in water, and shrimp feed pellets have a water resistance of ≥ 2 hours in order to reduce the loss and increase the feed utilization rate.
To solve the problem of water resistance of aquatic pellet feeds, two methods are generally adopted: First, increase the raw materials with more starch content, such as secondary powder and wheat flour, produce a certain adhesive force after gelatinization to increase the water resistance of the pellets; A special binder (or granulation aid) is added to the feed to impart a certain degree of water resistance to the particles through the unique adhesion. The first method takes a long time, and the heat-sensitive substances in feedstuffs, such as vitamins, enzyme preparations, probiotics, active factors, etc., are more destructive; the second method is less damaging to vitamins, enzyme preparations, etc. , And the amount of added, low cost, good effect, has occupied the mainstream, accepted by most feed manufacturers.
In the production of aquafeeds, polyurea-formaldehyde binders are currently used. This type of binder is generally a white homogeneous fine powder, which is easy to absorb moisture, and has a certain degree of adhesion when water is added at room temperature. However, it really exerts a strong bonding effect after conditioning and granulation. The moisture introduced by the steam during the conditioning makes the powder fully infiltrate between the feed powders. The polymer reacts chemically at the high temperature of quenching and granulation, in addition to the crosslinking between the molecules themselves, but also with the feed. The non-digestible cellulose, chitin, and lignin in the raw materials are covalently cross-linked by ether bonds, and form a highly branched lattice structure after cooling and solidification, thereby obtaining a highly water-resistant pellet feed.
Whether good particles can be obtained is not only related to the quality of the binder, but also closely related to the conditioning time, moisture, temperature, granulation temperature, and the like. Here is a simple way to determine the advantages and disadvantages of plastic powder: First, take 1 part of plastic powder plus 0.5 parts of water (weight ratio) with a glass rod to open. If it is a high-quality rubber powder, the rubber powder can be easily dissolved and opened, and it is transparent. Pulling out the rubber wire with a glass rod is easy. If it is a poor product, it will not be easily dissolved, and it will be difficult to pull out the long rubber thread. . The second is that high-quality rubber powder can dissolve in any proportion with water, and poor quality rubber powder is prone to precipitation or turbidity.
To use the powder to produce qualified pellet feed, you need to master the correct method of use:
(I) Sufficient time, temperature, and moisture The higher the conditioning and the higher the granulation temperature, the shorter the time for completing the adhesion reaction; the lower the tempering and granulation temperatures, the longer the time for completing the adhesion reaction. Generally, the cross-linking curing time of the general rubber powder at 100° C. is about 1 minute. Theoretically, when the tempering granulation temperature is 100° C., the material must stay in the conditioner and the granulator for a period of time. It takes 1 minute to fully crosslink and cure the powder. In addition, sufficient moisture infiltration is also necessary for curing. The shorter the time required for the complete curing of the powder, the finer the material, the better the infiltration effect, and the too coarse effect. If the above three conditions are well understood, just add 0.3% to 0.5% to achieve the desired effect.
(b) Do not store large amounts of rubber powder. Some feed plants reserve large amounts of raw materials at one time in the winter to be ready for use in the spring. This is due to the storage time of the powder is too long, prone to self-crosslinking, degeneration and loss of viscosity. Self-crosslinking occurs slowly at room temperature due to the rubber powder. The higher the temperature, the faster the reaction. In general, it is not appropriate to store six months of plastic powder in the southern area. It is best to use it immediately.
(C) should be stored in a dry, cool place, easy to absorb moisture absorption, moisture absorption will quickly consolidate into a block, lose its effectiveness and fluidity. Moisture-proof packaging is generally used, and once the bag is used up again, the bag should be fastened again.
To solve the problem of water resistance of aquatic pellet feeds, two methods are generally adopted: First, increase the raw materials with more starch content, such as secondary powder and wheat flour, produce a certain adhesive force after gelatinization to increase the water resistance of the pellets; A special binder (or granulation aid) is added to the feed to impart a certain degree of water resistance to the particles through the unique adhesion. The first method takes a long time, and the heat-sensitive substances in feedstuffs, such as vitamins, enzyme preparations, probiotics, active factors, etc., are more destructive; the second method is less damaging to vitamins, enzyme preparations, etc. , And the amount of added, low cost, good effect, has occupied the mainstream, accepted by most feed manufacturers.
In the production of aquafeeds, polyurea-formaldehyde binders are currently used. This type of binder is generally a white homogeneous fine powder, which is easy to absorb moisture, and has a certain degree of adhesion when water is added at room temperature. However, it really exerts a strong bonding effect after conditioning and granulation. The moisture introduced by the steam during the conditioning makes the powder fully infiltrate between the feed powders. The polymer reacts chemically at the high temperature of quenching and granulation, in addition to the crosslinking between the molecules themselves, but also with the feed. The non-digestible cellulose, chitin, and lignin in the raw materials are covalently cross-linked by ether bonds, and form a highly branched lattice structure after cooling and solidification, thereby obtaining a highly water-resistant pellet feed.
Whether good particles can be obtained is not only related to the quality of the binder, but also closely related to the conditioning time, moisture, temperature, granulation temperature, and the like. Here is a simple way to determine the advantages and disadvantages of plastic powder: First, take 1 part of plastic powder plus 0.5 parts of water (weight ratio) with a glass rod to open. If it is a high-quality rubber powder, the rubber powder can be easily dissolved and opened, and it is transparent. Pulling out the rubber wire with a glass rod is easy. If it is a poor product, it will not be easily dissolved, and it will be difficult to pull out the long rubber thread. . The second is that high-quality rubber powder can dissolve in any proportion with water, and poor quality rubber powder is prone to precipitation or turbidity.
To use the powder to produce qualified pellet feed, you need to master the correct method of use:
(I) Sufficient time, temperature, and moisture The higher the conditioning and the higher the granulation temperature, the shorter the time for completing the adhesion reaction; the lower the tempering and granulation temperatures, the longer the time for completing the adhesion reaction. Generally, the cross-linking curing time of the general rubber powder at 100° C. is about 1 minute. Theoretically, when the tempering granulation temperature is 100° C., the material must stay in the conditioner and the granulator for a period of time. It takes 1 minute to fully crosslink and cure the powder. In addition, sufficient moisture infiltration is also necessary for curing. The shorter the time required for the complete curing of the powder, the finer the material, the better the infiltration effect, and the too coarse effect. If the above three conditions are well understood, just add 0.3% to 0.5% to achieve the desired effect.
(b) Do not store large amounts of rubber powder. Some feed plants reserve large amounts of raw materials at one time in the winter to be ready for use in the spring. This is due to the storage time of the powder is too long, prone to self-crosslinking, degeneration and loss of viscosity. Self-crosslinking occurs slowly at room temperature due to the rubber powder. The higher the temperature, the faster the reaction. In general, it is not appropriate to store six months of plastic powder in the southern area. It is best to use it immediately.
(C) should be stored in a dry, cool place, easy to absorb moisture absorption, moisture absorption will quickly consolidate into a block, lose its effectiveness and fluidity. Moisture-proof packaging is generally used, and once the bag is used up again, the bag should be fastened again.
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