JPH0558692B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a binder for fish feed that uses an equal or greater amount of raw feed to the mixed feed. [Prior Art] In recent years, feed called moist pellets has rapidly become popular in the cultivation of sea bream, yellowtail, flounder, silverfish, etc. This is made by mixing raw feed such as sardines, mackerel, and sand locusts with a blended feed containing fish meal, grains, oil cake, nutrients, binders, etc., and then turning it into pellets using a granulator. In the past, raw food was fed in minced or chopped form, but this led to problems such as poor predation rates, unbalanced nutrition, pollution of the sea, laborious feeding, low yields, and a decline in quality. Ta. All of these problems can be improved with Moist pellets. A binder is essential for these moist pellets, and examples include sodium carboxymethyl cellulose (hereinafter referred to as CMC), guar gum, and sodium alginate. [Problem to be solved by the invention] Initially, the standard was to equalize the ratio of raw bait and compound feed, but due to the recent decline in fish prices and the high cost of compound feed compared to live bait, this has changed. Fish farmers are demanding an increase in the proportion of raw feed used, and feed manufacturers are demanding a reduction in binder costs. With conventional binders, as the proportion of raw feed used increases and the amount of binder used decreases, the amount of water increases relative to the amount of binder (raw feed contains approximately 70 to 85% water). However, it was not possible to obtain pellets of sufficient hardness, or the pellets became sticky, making it impossible to obtain a satisfactory product with practical use. The use of sodium polyacrylate in combination is disclosed in JP-A-63-137648, JP-A-1-117752, etc., but these only limit the viscosity and degree of etherification (DS) of CMC; This is insufficient to maximize the effect of the combined use of sodium polyacrylate. [Means for Solving the Problems] The present inventors have discovered that hard and non-sticky pellets can be obtained by using a certain CMC in combination with sodium polyacrylate, leading to the present invention. That is, the 1% viscosity is 10,000 cps or more, preferably
13000cps or more, degree of etherification (hereinafter referred to as DS)
is 0.60 to 0.90, preferably 0.65 to 0.85,
In addition, by using CMC with a viscosity retention rate of 30% or less after addition of 3% NaCl and 0.5 to 10% sodium polyacrylate, preferably 1 to 4%, the mixing ratio of live bait can be equal or higher. However, they discovered that it is possible to produce beautiful pellets with non-sticky skin. 1% viscosity is less than 10,000 cps, DS is less than 0.60 or more than 0.90, and viscosity retention after addition of 3% NaCl is more than 30%. It is not practical because the effect is not noticeable or the stickiness increases. Also, none of the above conditions are met.
Even with CMC, if the amount of sodium polyacrylate added is less than 0.5% or more than 10%, there will be no significant effect, or on the contrary, it will become soft and sticky. In other words, its effects are exhibited within an extremely limited range. The present inventors conducted a study in consideration of the viscosity retention rate, and found that the lower the viscosity retention rate, the higher the water absorbency, that is, the tendency to obtain hard, non-sticky pellets, but the caking It was found that there was a slight lack of On the other hand, although sodium polyacrylate has caking properties, it has the disadvantage that it tends to become sticky due to its stringiness. Therefore, it was found that when CMC with a viscosity retention rate of less than 30% and sodium polyacrylate are used in combination, they compensate for each other's shortcomings and exhibit their advantages, leading to the present invention. Possible methods for mixing sodium polyacrylate include powder mixing and liquid mixing. The methods shown in JP-A-63-137648 and JP-A-1-117752 both involve powder mixing, but sodium polyacrylate has slow solubility and
As described in No. 137648, if coarse particles are used, it is difficult to obtain a stable product. In addition, since it has high hygroscopicity, fine particles tend to form blocks and must be handled with care. However, when added in the form of an aqueous solution, CMC is coated uniformly, so it dissolves quickly and can demonstrate its ability in a short kneading time when producing moist pellets. Therefore, it is most suitable as a binder for onboard pellets. In addition, it is possible to use other binders commonly used in the present invention, such as guar gum and sodium alginate. Γ Measurement of viscosity retention Dissolve CMC equivalent to 1% by weight in a pure dry state (600 rpm, 3 hrs), take 500 g of it,
Add 15 g of NaCl and further stir at 600 rpm for 2 hrs. Similarly, the remaining 1% by weight glue was heated at 600 rpm.
Stir for 2hrs. Thereafter, the temperature was adjusted to 25°C and measured using a B-type viscometer manufactured by Tokyo Keiki Co., Ltd. at 30 rpm for 3 minutes. Viscosity retention rate (%) =
Viscosity after addition of 3% NaCl / Viscosity before addition of 3% NaCl x 100 [Example] Examples 1 to 4, Comparative Examples 1 to 3 A 5% aqueous solution of sodium polyacrylate was adjusted to a solid content of 1.3%. A corresponding amount of the mixture was added to CMC, mixed well, dried with air at 80°C for 3 hours, and pulverized. 49 parts by weight of fishmeal and 1 part by weight of the obtained binder were thoroughly mixed to obtain a compounded feed. 50 parts by weight of mixed feed and water
After adding 80 parts by weight, the hardness of the pellets was compared immediately after, 5 minutes later, and 30 minutes later.

【table】

[Table] As shown in Table 1, if sodium polyacrylate is not used or if the addition rate is 10% or more, sufficient hardness cannot be obtained, and it is unsuitable to use raw bait in an equal amount or more. On the other hand, if the sodium polyacrylate addition rate is appropriate, a product with sufficient hardness can be obtained regardless of the mixing method of sodium polyacrylate.
Possibly because solution mixing coats CMC more uniformly, it takes less time to reach its full potential. Examples 5-6, Comparative Examples 4-8 2 parts by weight of a mixture of CMC or sodium polyacrylate shown in Table 2 added as an aqueous solution was added to fishmeal.
98 parts by weight and mixed well to obtain a mixed feed.
12 kg of crushed frozen sardines and 8 kg of mixed feed were pelletized using a granulator manufactured by Mitsuya. The pellet diameter was 4 minutes.

〔Effect of the invention〕

As shown in Tables 1 and 2, it was found that by using CMC with a low viscosity retention rate in combination with sodium polyacrylate, a good non-stick binder for fish feed could be obtained, and the present invention was developed. completed.

Claims (1)

[Claims] 1. The 1% viscosity is 10,000 cps or more, and the degree of etherification is
0.60-0.90, viscosity retention rate is 30% after adding 3% NaCl
A binder for fish feed, characterized by comprising the following sodium carboxymethyl cellulose and sodium polyacrylate. 2. The binder according to claim 1, wherein sodium polyacrylate is added in an aqueous solution. 3 Addition amount of sodium polyacrylate is 0.5~
The binder according to claim 1 or 2, wherein the content is 10%.