JPS5930B2 - Pellet pellets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing pellet feed for carp farming.

In recent years, the practical use of compound feeds for carp farming has progressed, and the spread of pellet feeds in particular has been remarkable.

Normally, pellet feed is produced by humidifying and heating a feed raw material mixture, which is then introduced between the die and rollers of a pellet molding machine, and then injection molded through small holes in the die.

Feed pelleted in this way has a uniform nutritional content, less loss when eaten and scattered, and the fish grow at a good rate. It is also very easy to feed and can be stored for a long time, making it extremely practical. It is true.

However, when producing pelleted feed, it is humidified using a conditioner.

Even if the heating conditions are adjusted, depending on the type of feed material or the blending ratio of the feed material, when passing through the small hole of the die,
This imposes a large load and makes it very difficult for the feed material to pass through the die.

Even if it passes through the die, because it is forced out, the temperature of the die becomes higher than necessary due to friction, creating a vicious cycle in which it becomes even more difficult to pass through the die.

In such cases, not only will the ability to mold pellets deteriorate, but the hardness of the molded pellets will increase excessively as they are forced out, making it difficult for fish to eat them.
In addition, since the pellets are heated excessively, nutritional components such as vitamins are destroyed, resulting in problems such as not being able to obtain nutritionally satisfactory pelleted feed.

Sodium phosphate is a feed material that is difficult to pass through the die.

Adding sodium phosphate to carp feed is effective in preventing bone whitening disease and promoting growth in carp, but as mentioned above, it is difficult to add sodium phosphate and form pellets using the conventional method. However, it was only added to powdered feed.

That is, it has been considered difficult to form pellets by adding sodium phosphate.

As a result of extensive research, the inventors of the present invention found that injection molding was performed through a die formed so that the cross-sectional area ratio of the through-hole entrance and exit of the die was 1:1.05 to 1.50, and the through-hole was stepped. They found that it was possible to form pelleted feed for carp farming even when sodium phosphate was added, and completed the present invention.

That is, in the present invention, sodium phosphate is added and mixed to the feed raw material for carp cultivation, and after conditioning the humidity, the pellet molding machine is formed so that the cross-sectional area ratio between the inlet and outlet of the die is 1:1.05 to 1.50. A method for producing pellet feed for carp, which is characterized by injection molding through a die formed with steps in the hole. To provide a method for manufacturing excellent pellet feed for carp farming at low cost and in large quantities.

Next, the present invention will be explained in more detail.

Feed materials for carp farming used in the present invention include fishmeal, soybean meal, flea sources such as yeast, carbohydrate sources such as wheat flour, rice flour, and rice bran, vitamins and minerals for nutritional reinforcement, and other raw materials. These can be appropriately selected depending on the growth level of the carp and the like.

The sodium phosphate added to the feed raw material for carp cultivation is preferably soluble sodium phosphate, and particularly preferably anhydrous sodium diphosphate.

If the amount added is less than 0.1%, the effect of promoting the growth of carp will be small, and if it is more than 5%, the effect will decrease, so 0.1
-5% is desirable, and a range of 0.5-3% is particularly preferred.

The mixture obtained by adding sodium phosphate to the raw material for carp culture feed is then mixed well and then heated to a moisture content of 10-20% and a temperature of 30-10%.
Humidify and heat to 00℃.

Then, the humidified and heated raw material mixture is introduced between the die and roller of the pellet molding machine, and the through-hole is stepped with a cross-sectional area ratio of the inlet and outlet of the die of 1:1.05 to 1.50. Injection molding is performed through a die formed to have the following properties.

As the pellet molding machine used in the method of the present invention, a roller extrusion molding machine commonly called a pellet mill or a molding machine having a structure substantially similar thereto can be used.

The die used in the pellet molding machine is a ring-shaped die, and the shape of the through hole is as shown in Figure 1. It may be selected appropriately depending on the growth degree, and the exit diameter of the die through hole is 0.2 to 0.3 rI compared to the inlet diameter.
The cross-sectional area ratio of the inlet and outlet is 1:1.0.
5 to 1.50.

If the cross-sectional area ratio is less than 1:1.05, it will be difficult for the carp farming feed raw material mixture containing sodium phosphate to pass through the die, and if the cross-sectional area ratio is more than 1:1.50, it will be difficult to pass through the die through-hole in the ring die. The number is limited, which in turn leads to a decline in capacity.

It is also important to step the inside of the through hole, and the die is formed so that the diameter of the through hole gradually becomes dog-shaped toward the exit. The feed raw material mixture cannot be formed into pellet feed of satisfactory quality.

The thickness W of the ring die is the dimension for forming a step in the through hole.
Although it varies depending on the
It is desirable to have a step at the position.

Table 1 shows an example of the through-hole diameter and one-stage thickness of the die used in the present invention.

The pelleted feed for carp farming produced by the method of the present invention does not experience a large resistance when passing through the die, so even if sodium phosphate is added, the pellet feed can be formed into pellets without clogging the through holes of the die.

When adding sodium phosphate using the conventional method, even if it were possible to form pellets, the ability to form them into pellets would be extremely low.
The hardness becomes very high, and when fed to carp, the feed intake is poor, but the pellet feed for carp farming produced by the present invention has an appropriate hardness and a high powdering rate compared to the hardness. The feature is that it does not.

Inventive feed, commercially available carp feed (no sodium phosphate added)
Table 2 shows the hardness and pulverization rate of the control feed that was pelletized using a conventional die with the addition of sodium phosphate.

Next, Table 3 shows the rearing results when carp were fed the pellet feed for carp farming of the present invention.

As can be seen from the rearing results in Table 3, it can be seen that the pellet feed for carp farming of the present invention has better growth results than the conventional pellet feed for carp farming.

In addition, the pellets have low hardness and have the advantage of not only being good for carp to feed on, but also having a low rate of powdering during transportation.

Next, examples of the present invention will be shown.

Example 1 White fish meal 60% Wheat flour 35% Vitamin mixture 2 Mineral mixture 1 After adding 2 qlb of sodium diphosphate to the above raw materials, the moisture content was adjusted with steam to a moisture content of 15 q, and this mixture was Guided between the goo and roll of the pellet forming machine, nominal diameter 3.2m
The cross-sectional area ratio of the inlet and outlet of the die through-hole is 1:1.20, and injection molding is performed using a die formed so that the through-hole is stepped, and then dried in a ventilation dryer to produce carp for cultivation. pelleted feed was obtained.

The obtained pellet feed for carp farming had a hardness of 5.9 Kdd, a crude protein of 42, and an OS.

Example 2 White Fitzmeal 60% Wheat Flour 33% Vitamin Mixture 2% Mineral Mixture 4% Sodium Diphosphate was added to the above raw materials and the humidity was adjusted with steam to a moisture content of 14%. The mixture was introduced between the guide and the roll of the pellet molding machine, and a die was formed with a nominal diameter of 4.5 mm and a cross-sectional area ratio of the entrance and exit of the die through-hole of 1:1.07, so that the through-hole was stepped. Injection molded using
Next, it was dried in a ventilation dryer to obtain pelleted feed for carp farming.

The hardness of the pellet feed for carp farming thus obtained was 6.
Crude protein was 41.7% at I Kti/cm.

Comparative Example 1 White Fitzmeal 60% Wheat Flour 35% Vitamin Mixture 2nd Class Mineral Mixture After adding 2 parts of sodium diphosphate to the above raw materials, the humidity was adjusted with steam to a moisture content of 15%. The mixture was introduced between a die and a roll of a pellet molding machine, and injection molded using a conventionally used die with a nominal diameter of 3.2 mm and an inlet and an outlet of the die through-hole of the same size.

However, it quickly became clogged and could not be molded, so the feed rate of the raw material mixture was extremely reduced, a small amount was molded, and it was dried in a ventilation dryer.

Approximately half of the pelleted feed for carp farming that was obtained had a burnt color due to the frictional heat during passage through the die, making it unsuitable as feed for carp farming.

The hardness of pellets that can be fed as carp feed is 13.5.
The crude protein in KV/crr1 was 42.0%.

Control Example 2 White Fitzmeal 60% Wheat Flour 33% Vitamin Mixture 2% Mineral Mixture 4% Sodium Diphosphate was added to the above raw materials and the water content was 1%.
The humidity was adjusted with steam to 4%, and this mixture was introduced between the die and roll of a pellet molding machine, and a die was formed with a nominal diameter of 4.5 m so that the diameter of the die through hole gradually increased toward the exit. It was injection molded using.

However, a large load was applied to passing through the die, and clogging easily occurred, making molding impossible.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the through-hole portion of the die.

Claims (1)

[Claims] 1. Sodium phosphate is added to and mixed with the feed raw material for carp cultivation, and after conditioning the humidity, it is mixed in the through-hole with a cross-sectional area ratio of the through-hole inlet and outlet of the die of a pellet molding machine of 1:1.05 to 1,50, A method for producing pellet feed for carp farming, characterized by injection molding through a die formed so as to be stepped.