JPS62181762A - Treatment of raw laver - Google Patents

Abstract

PURPOSE:To improve the efficiency of drying treatment and freezing treatment processes of laver, by washing raw laver consisting of laver leaf of >=30mum thick, dehydrating the cleaned laver and drying and scattering the laver at least to a water-content to unable the mutual adhesion of the laver leaves. CONSTITUTION:Raw laver composed mainly of laver leaves of >=30mum thick is washed with a washing liquid and dehydrated. The cleaned laver is scattered in a dried atmosphere until the water-content of the laver reaches at least a level to unable the mutual adhesion of laver leaves. The raw laver preferably contains $90% leaves of >=30mum thick. Preferably, the washing liquid is fresh water and the water-content of the washed and dehydrated laver is 450-800%. The scattering treatment is preferably carried out in a dried atmosphere in a ventilative vessel having a rotary shaft furnished with stirring blades while ventilating the vessel. The scattered raw laver can be dried in scattered form or frozen.

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to a method for processing raw seaweed.

b. Conventional techniques Traditionally, raw seaweed is processed by shredding,
Paper making and drying processes are performed, vacuum freezing, peeling, and drying processes are performed to produce vacuum freeze-dried products, and dehydration, peeling, and frozen storage processes are performed for preservation. During these treatments, the peeling process is carried out either manually or by passing the nori clumps through a rotating blade.

C9 Problems to be Solved by the Invention In all conventional loosening processes, the water adhering to the surface is not sufficiently removed, so even after the loosening process, the adhesion of leaf bodies to each other cannot be avoided. In order to obtain a product, it is necessary to further loosen the material after drying, which is a rather difficult task. If there is a treatment method that prevents the adhesion of leaves to each other before drying, it would be easy to obtain dried pieces. Also, when storing raw seaweed in a frozen state, it is not only necessary to make it into non-clumps as in the conventional loosening process.
If the sheets of seaweed are kept in a state where they are not attached to each other, faster freezing and thawing can be expected.

d. Means for Solving the Problem The present invention consists of washing and dehydrating fresh seaweed mainly consisting of leaf pieces with a thickness of 30 μm or more with fresh water or a salt solution, and converting the seaweed into a water-containing layer that does not cause mutual adhesion of at least the leaf bodies. This method is characterized by performing discrete processing in a dry atmosphere to a certain extent. By carrying out this treatment, it is possible to obtain seaweed in which the leaves do not stick to each other when a subsequent drying treatment or freezing treatment is performed.

In the present invention, leaf pieces with a thickness of 30 μm or more have a thickness of 90 μm or more.
It is preferable to use raw seaweed containing % or more, and the thickness is 30 μm.
If less than 90% of the leaf pieces have a size of m or more, it becomes difficult to eliminate the overlap between the leaf bodies.

FIG. 1 shows an example of an apparatus for carrying out the present invention, which was used in Experiments 1 to 3. 1 in the diagram has a diameter of 400M
, a drum-shaped drying basket with a length of 500 meshes and 16 meshes, 2
is a rotating shaft on which 16 stirring blades (rotating diameter 390 u) 3 are arranged in alternating positions.

4 is a dry air outlet.

Experiment 1゜In this experiment, the effects of various discrete conditions on the discrete end-money/water ratio of seaweed and its discrete state were investigated.

First, it contains 95% of leaf pieces with a thickness of 30 pm or more, and has a leaf length of 2.
~5 cm of seaweed produced in Aichi Prefecture was washed with fresh water, centrifugally dehydrated, and dried. 1) Placed in 1, turned the 0-rotation shaft 2, and stirred with a stirring blade for $1.
) In Step 3, disperse the seaweed and dry the dry air.
The air outlet 4 is distributed almost evenly from the bottom to the top of ll.
More ventilation.

After a certain period of time, stirring was stopped and air drying was continued, and after drying, the discrete state of the seaweed was observed. As shown in Table 1, the results are the temperature, humidity, and air volume of the dry air.

It has been found that regardless of the drying speed set depending on the amount of seaweed input and the speed of the tip of the stirring blade, if the discrete treatment is performed until the water content reaches approximately 400%, a good discrete state of the seaweed can be obtained. However, when the stirring blade tip speed was less than 1 m/sec, the dispersion was insufficient even though the water content was less than 400%. In addition, for the determination of the discrete state, less than 10% of adhesion of leaflets was evaluated as good, and 10% or more was evaluated as poor.

Experiment 2゜In this experiment, we investigated the effect of the discrete frequency of seaweed on the discrete state. M loss is raw seaweed 0.6kg, wind 1t40d/
minutes, temperature 50℃, humidity 15%RH, stirring blade tip speed 1
．． The experiment was carried out under conditions of 0 and 2.0 m/sec, and the discrete frequency was adjusted by adjusting the rotation speed of a rotating shaft equipped with stirring blades and by intermittent operation. After performing the m-defeat treatment for 5 minutes, it was transferred to ventilation drying, and the results shown in Table 2 were obtained. Discrete frequency of seaweed is 40
If stirring was not performed more than once per minute, lumps would be formed during stirring and a good discrete state could not be obtained.

Experiment 3゜In this experiment, when using salt R solution as the cleaning solution,
The influence of its type and concentration on discrete processing was investigated. Raw seaweed was washed with various salt solutions of 0 to 4% concentration and dehydrated by centrifugation at 1000 rpm for 5 minutes.

Figure 2 shows the water content of washing and dehydration at this time.
Table 3 shows the details of the values displayed in Figure 2.As seen in the table, the slope varies depending on the type of salt in the cleaning solution, but
It decreases as the concentration increases.

Furthermore, the amount of input is 0.6 kg, 1.2 kg, and wind 1
40i/min, temperature. Discrete treatment was carried out under the following conditions: 15% NO, a stirring blade tip speed of 2 m/sec, and a discrete frequency of 170 times/min. Figure 3 shows the case where the cleaning solution is saline, but when the concentration is high Indeed, a good discrete state cannot be obtained unless a low moisture content formation discrete process is performed.

The time required for the discrete treatment at this time tends to be shorter as the salt concentration of the cleaning liquid is higher, and it seems to be influenced by the initial water content during the discrete treatment, that is, the water content of cleaning and dehydration.

When the salt concentration is about 4%, the seaweed tends to adhere to the stirring blades and become tangled, resulting in poor yield, so it is preferably 3% or less.

From Figure 3, the upper limit of the water content at the end of the discrete process to obtain a good discrete state is when the salt concentration is X% (400-
33X)%. For other saline solutions, the slope is only different from that for saline water, and if you multiply the salt concentration by a conversion factor and make the salt equivalent concentration (400-33
Table 4 shows examples of conversion factors.

Examples are shown below. In each of the Examples, fresh water was used as the wall cleaning solution that had been subjected to the same NJ treatment as in Experiment 3 in Example 1, and a 2% magnesium chloride solution was used in Example 2. At this time, the upper limit of the water content at the end of the discrete process to obtain a good discrete state is 400% 400-33 x 2 x O,8B = 342%.

Example 1 1.2 kg of fresh seaweed was washed with fresh water, centrifugally dehydrated, and then subjected to discrete treatment for 7 minutes to reach a water content of 372%. When this was vacuum freeze-dried, it yielded 200% of good dried seaweed roses.
I was able to obtain g.

Example 2゜Washing 0.6 kg of raw seaweed with 2% magnesium chloride solution,
When the sample was dehydrated and subjected to a discrete treatment for 3 minutes, a good discrete state was obtained as shown in the table below.

e. Effects of the Invention Since the treatment of the present invention increases the surface area of seaweed due to its "glue effect," it is expected to improve the efficiency of subsequent treatments such as drying treatments such as vacuum freeze-drying and hot air drying, freezing treatments, and thawing treatments. It is possible to shorten these processing times and save energy.Furthermore, if it is performed as a pre-drying treatment, a new form of dried seaweed can be created, and it can respond to diversification of consumption.

Table-4

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing an example of an apparatus for implementing the present invention. Figure 2 is a diagram showing the relationship between the salt concentration of the cleaning solution and the moisture content during dehydration of seaweed, and Figure 3 is a diagram showing the influence of the saline cleaning solution on the relationship between the moisture content at the end of the discrete process and the discrete state. . ■...Drum-shaped drying basket, 2...Rotating shaft, 3...
Stirring blade, 4...Dry air outlet. Patent applicant: Yamagata N Noriten Co., Ltd. (and 2 others) Yomiken Ryokan Nisho Degree (%) Fig. 3 Katsu Jyobo Salt Concentration (%)

Claims (9)

[Claims] (1) Raw seaweed mainly consisting of leaf pieces with a thickness of 30 μm or more is washed and dehydrated with a cleaning solution, and subjected to discrete treatment in a dry atmosphere until at least the moisture content of the seaweed leaves does not cause mutual adhesion. processing method. (2) The method for processing raw seaweed according to claim (1), wherein the raw seaweed contains 90% or more of leaf pieces with a thickness of 30 μm or more. (3) The method for treating raw seaweed according to claim (1), wherein the cleaning liquid is fresh water, and the discrete treatment is performed until the water content reaches about 400%. (4) The method for treating raw seaweed according to claim (3), wherein the water content after washing and dehydration is 450 to 800%. (5) The method for treating raw seaweed according to claim (1), wherein the washing liquid is salt water containing 3% or less. (6) A method for treating raw seaweed according to claim (5), characterized in that when the concentration of the salt water is X%, the discrete treatment is performed until the water content reaches (400-33X)%. . (7) The above-mentioned discrete treatment is carried out in a dry atmosphere in a ventilated container having a rotating horizontal axis equipped with stirring blades and with ventilation inside the container. How to process raw seaweed. (8) The method for treating raw seaweed according to claim (7), wherein the frequency of the discrete treatment is 40 times/min or more, and the stirring blade tip speed is 1 m/sec or more. (9) The method for processing raw seaweed according to claim (1), characterized in that the raw seaweed obtained by the above-mentioned discrete treatment is subjected to bulk drying treatment or freezing treatment.