JPS6174563A - Drying of thin algae - Google Patents

Abstract

PURPOSE:To carry out the drying of thin algae having a water-content of >=400%, keeping the leaves in separated state, by repeating the separation of the leaves at least 10 times in the course of decreasing the water-content by 100%. CONSTITUTION:Thin algae having a water-content of >=400% and a thickness of <=100mu are put into the drying basket 1. Dry air is blasted to the basket 1 through the dry air inlet 4 of the blower 3, and at the same time, gas is ejected intermittently toward the algae through the gas nozzle 6. The algae are floated in the basket and separated homogeneously from each other by this process. The separation process is repeated at least 10 times before the water-content is decreased by 100% according to the progress of the drying. When the repetition time of the separation process is less than 10, sufficiently homogeneous drying cannot be attained.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a method for drying thin seaweed.

(b) Although it is produced using conventional techniques, no good mechanical method has yet been established for breaking it up into pieces and drying them (hereinafter referred to as hara-drying).

(c) Problems to be Solved by the Invention It is necessary to separate the leaves in the drying process in order to dry the seaweed clumps under a drying atmosphere using only a drying device.

(d) Means for solving the problems, that is, the present invention has a water content of 400% or more and a thickness of 100%.
Using meat 'iR seaweed of less than μ, its moisture content is 150%.
In the process of drying until the moisture content is reduced to 100
% reduction, the seaweed is subjected to iA dispersion at least 10 times.

In the present invention, the seaweed used is gamma moss or hitoke, and its moisture content must be 400% or more. Here, moisture content is the ratio of moisture to dry weight (χ
), for example, seaweed 20g (dry weight), water content 8
In the case of 0g (normally 80% moisture and at the beginning of the drying process,
Since the seaweed leaf pieces partially stick to each other or there is a possibility that they stick to each other, it is not possible to disperse them effectively.

In addition, seaweed with thick mesophyll can be dried in pieces by ordinary mechanical drying methods such as transfer drying, but in the case of thin seaweed with a thickness of about 100 μm or less, such as nori and hitoegusa, With ordinary mechanical drying methods, it is difficult to dry the material into pieces.

In the present invention, the term "dispersed seaweed" refers to a state in which the leaf pieces of seaweed are broken apart without adhering to each other.

The seaweed can be dispersed by a method such as injection of compressed gas or stirring with a rotating blade.

Figure 1 shows an example of an apparatus for implementing the method of the present invention, in which 1 is a drying basket, 2 is a cover to prevent seaweed from scattering during the discrete process, 3 is a blower, and 4 is dry air. The inlet, 5 is a rectifying plate, and 6 is a gas injection pipe.

First, seaweed is put into a drying basket 1, and this drying basket 1 is placed above the blower 3 and the gas injection pipe 6, and dry air is introduced from the dry air port 4 of the blower 3.

The drying air is rectified by the rectifying plate 5 and blown onto the bottom surface of the nrI in a uniform distribution.

In this manner, while blowing dry air onto the cage, gas is intermittently injected onto the seaweed from, for example, the gas injection tube 6 having a tip diameter of 1 to 4 fl.

As a result, the seaweed floats upward within the chamber and is dispersed evenly.

The above-mentioned injection gas can be air, nitrogen, carbon dioxide, etc., and is not particularly limited. Further, the injection pressure, injection distance, injection angle, and injection time of the gas can be appropriately determined in consideration of the aggregation state, size, discrete state, etc. of the seaweed. Further, the shape of the injection tube, particularly the shape of the tip, can be appropriately determined in consideration of the aggregation state, size, discrete state of the seaweed, the shape of the cage, etc.

In the present invention, ventilation of dry air must be carried out so that dry air is evenly supplied to the seaweed in the layer from the bottom of the cage. The amount and speed of air flow are preferably such that dry air flows between the seaweed in the chamber, and the amount and speed are such that the seaweed blown up by the gas injection slowly falls.

In addition, in the present invention, the above-mentioned discrete step must be performed at least 10 times while the moisture content decreases by 100% as the drying progresses.The moisture content is measured at appropriate times during the process. Control the discrete number of times.If the discrete number of times is less than 10, it will not be possible to dry sufficiently evenly and evenly, and if it is performed too frequently, gas and energy will be wasted, so Above 2
00 times or less is preferable.

FIG. 2 shows another example of an apparatus for carrying out the method of the present invention, in which the dispersion of seaweed is performed by rotation of a rotary blade 8 instead of the gas injection tube in the apparatus shown in FIG. .

(e) Example 50 g of fresh seaweed with a leaf length of 2 to 5 cIn and a water content of approximately 560% (approximately 85% moisture) that has been centrifugally dehydrated is placed in a container with a diameter of 220 fl.
.

A drying basket 1 with a depth of 250 inches and a 16-mesh mesh was filled with dry air at 40°C, relative humidity (1?H), and 15% while adjusting the air flow to 20 m/min. Ventilation was evenly distributed from the bottom to the top.

Then, compressed air was injected at a frequency of 50 times/minute from a gas injection tube with a tip diameter of 2 mm at a speed of 50 m/sec for 0.1 seconds each time to disperse the seaweed. The moisture content of seaweed is 2
When the temperature reached 30 to 120%, the spraying was stopped and air drying was continued. Observing the discrete state of nori after drying,
The results are shown in Table-1. Note that the determination of the discrete state is as follows:
Less than 10% of adhesion between leaf bodies was considered good, and 10% or more was judged to be poor.

Table 1 From Table 1, according to the present invention, the algae can be dried in pieces so that their leaf pieces do not adhere.

Next, raw seaweed and fresh seaweed with a leaf length of 2 to 5 cm were placed in a drying pan, and while air drying under seed conditions, compressed air was sprayed from below at a constant frequency to dry. The results are shown in Table-2.

Table 2 (F) Effects of the Invention According to the method of the present invention, thin seaweed can be dried so that its leaf pieces are in a well-dispersed state. Moreover, drying of thin seaweed, which conventionally required manual labor, can be efficiently and mechanically carried out. The products obtained according to the present invention can be enjoyed as is, for example, as a pickled dish, fried as a snack food, or roasted as a soup ingredient.

Additionally, if you use uncut raw materials, you can enjoy the shape of the raw materials.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing an example of an apparatus for carrying out the method of the present invention, and FIG. 2 is a conceptual diagram showing another apparatus. l...Drying basket, 3...Blower, 6...Gas injection pipe, 8...Rotating blade. Figure 1 Figure M2

Claims (4)

[Claims] (1) Using thin seaweed with a water content of 400% or more and a thickness of 100μ or less, in the process of ventilation drying until the water content drops to 150% or less, at least the dispersion of seaweed is caused while the water content is reduced to 100%. A method for drying thin seaweed, which is characterized by drying the seaweed 10 times. (2) The method for drying thin-walled seaweed according to claim (1), wherein the thin-walled seaweed is nori or hitoegusa. (3) The method for drying thin seaweed according to claim (1) or (2), wherein the seaweed is dispersed by gas injection. (4) The method for drying thin seaweed according to claim (1) or (2), wherein the seaweed is dispersed by stirring.