JPS6174564A - Method and apparatus for drying laver - Google Patents

Abstract

PURPOSE:To prepare dried and rubbed laver sheet in a form suitable for roasting, and to minimize the loss of nutrient components in the initial stage of drying, by carrying out the rubbing of the laver in the drying process during the period to decrease the water-content of the laver from 70% to 45%. CONSTITUTION:The term ''rubbing'' means the operation comprising the rubbing of laver leaves between a pair of plates, etc. The rubbing apparatus is composed of the rotary blades 2 acting as the rubbing arms and rotating clockwise, the porous rotary disk 4 acting as the rubbing face and rotated counterclockwise by the motor 7, and the air-inlet 10 to introduce dry air during the rubbing process. Excellent result can be attained by carrying out the rubbing of the laver during the period to decrease the water-content of the laver from 70% to 45%.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method of drying seaweed and an apparatus for carrying out the method.

(b) Conventional techniques and problems In general, most of seaweed is produced into sheets of seaweed and consumed. In producing this plate nori, a large amount of water is used from the time the seaweed is shredded to the time it is made into paper.As a result, a considerable amount of nutritional components are washed away from the thin sections of the seaweed, causing the seaweed to deteriorate. was. Recently, dried rose products,
Vacuum freeze-dried leaves are dried as they are, so they have the disadvantage of being large in shape, making roasting difficult, and increasing costs.

(C) Means for solving the problems The present invention aims to provide a method for drying seaweed that eliminates these drawbacks, as well as an apparatus for carrying out the method. , a method for drying seaweed characterized by massaging the seaweed in the process of reducing the moisture content of the seaweed from 70% to 45%, and a perforated rotary disk with ventilation, and an eccentric arrangement on the rotary disk. The rotary blade is equipped with a blower device for blowing air from below to the rotary disk, and the seaweed is rubbed between the lower end surface of the rotary blade and the perforated rotary disk. It's in the seaweed drying equipment.

In the drying method of the present invention, first, the picked seaweed fronds are washed with fresh water or salt water (1 to 3% solution) and immediately centrifugally dehydrated, or they are centrifugally dehydrated as is without rinsing.

In this way, dehydrated seaweed fronds containing about 75 to 85% moisture are obtained.

This is subjected to a drying process and dried through ventilation until the moisture content is approximately 30%. During this drying process, "kneading" is performed in the process of reducing the moisture content from about 70% to about 45%.

This "kneading" refers to the operation of pinching and rubbing the nori, and this operation is performed by pushing the kneading hands and the kneading surface in opposite directions, or by pushing the kneading hands or the kneading surface.

FIG. 1 shows a drying and kneading device suitable for performing the above-mentioned ventilation drying and kneading.

In the figure, 1 is a rotating blade, which is made up of two Teflon plates 2
．． 2 is attached to a rotating shaft 3.

The rotating shaft 3 is structured so that it can be moved up and down a certain distance by the upward force exerted on the Teflon plate 2.2. As shown in FIG. 2, the lower surfaces 2' of the Teflon plates 2, 2 are formed, for example, from 30 to 60 a with respect to the multi-hole rotary disk described later, and the thickness of the Teflon plates is, for example, from 3 to 10 mm.

Reference numeral 4 denotes a rotary rotary disk with permeable holes, which is made of a stainless steel net 5 of 50-100 mesh stretched over a frame 6, and a rotating shaft 8 of a motor 7 is mounted in the center thereof.

Reference numeral 9 denotes a wind box provided on the lower surface of the multi-hole rotary disk 4, which has a dry air volume 10 and is provided with a rectifying plate 11 inside.

Further, the shaft 3 of the rotary blade I is the rotary shaft 8 of the motor 7.
It is placed eccentrically.

Now, a certain amount of the above-mentioned dehydrated seaweed is supplied onto the net 5, and while rotating the rotary blades 2, which serve as kneading hands, clockwise, the multi-hole rotary disk 4, which serves as the kneading surface, is rotated in the opposite direction by the motor 7. . At the same time, dry air is fed from the inlet 10, and air rectified by the rectifying plate 11 is fed from the lower surface of the net 5.

The seaweed on the net is rubbed while being dried by ventilation. That is, the seaweed on the net is caught between the lower surface of the rotating blade and the upper surface of the net and rubbed. In this way, the nori is shrunk and dried while being broken up and somewhat curled.

(iv) Example 1 In the illustrated apparatus, a Teflon plate with a thickness of 4 fl was used as the rotary blade, and a 60 mesh sieve was used as the perforated rotary disk.

In addition, the judgment criteria are that the sample is cut into 'l am squares, and after shrinkage,
Those that passed through a 1-square sieve in an amount of 90% by weight or more were considered good.

The sample was seaweed produced in Aichi Prefecture, weighing 10 g in terms of dry matter.

The above sample was dried in advance to a moisture content as shown in Table I, and then placed in the illustrated apparatus and kneaded while being ventilated.

Two examples will be shown below.

(1,1 atmosphere 28℃, humidity 60% impeller rotation speed 300 times/min sieve ~ 100 times/min interval between impeller and sieve 1 fl Under the above conditions, start kneading from the moisture content in Table 1 and measure the final moisture content. As a result of drying to 30%, the starting moisture content of kneading is 70%.
The above was good.

(2) Atmosphere: 28°C, Temperature: 60%, Rotation speed of impeller: 300 times/min Sieve: 100 times/min Distance between impeller and sieve: 11 Under the above conditions, the seaweed with a moisture content of 80% was kneaded to the moisture content in Table 2. Then, raise the blade and send dry air through the porous disk until it dries to 30%. After kneading, the moisture content is 45%.
The following were good.

Table-1 Table-2 Example 2 Atmosphere 40°C1 Humidity 30% Air volume
1rr? /min Blade rotation speed 300 times/min Sieve = 100 times/min Initial moisture of seaweed 80% by weight Final moisture of seaweed 40〃Size of seaweed Approximately 3ω square Dehydrated seaweed leaves are made into a size of approximately 3cm square. When the sheets were cut and dried under the above conditions, it was found that even when the distance between the blades and the sieve was increased, a good product could be obtained by increasing the number of molds in which seaweed was added. Similar results were obtained when the seaweed was cut into approximately 2 cm square pieces.

Note that the criteria for the evaluation were the same as in Example 1, using a 4-square sieve.

Table 3 The seaweed that has undergone the drying and kneading process described above is then roasted.
Becomes a product.

(e) Effects of the present invention According to the present invention, it is possible to obtain dried and kneaded seaweed in a shape that is easy to roast. Moreover, the obtained seaweed is one in which the initial leakage of nutritional components is suppressed as much as possible.

Furthermore, the roasted product exhibits a bright green color in water and spreads quickly.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an apparatus for carrying out the method of the present invention, with a part cut away, and Fig. 2 is an enlarged cross-sectional view showing the lower end of the rotary blade and the mesh of the multi-hole rotary disk. . ■... Rotating blade, 4... Multi-hole rotary disk, 9... Wind box.

Claims (2)

[Claims] (1) A method for drying seaweed, which is characterized by rubbing the seaweed in the process of reducing the moisture content of the seaweed from 70% to 45%. (2) A perforated rotary disk with permeable holes and a rotary blade eccentrically arranged on the rotary disk, a blower device for blowing air from below to the rotary disk, and a porous hole between the lower end surface of the rotary blade and A drying device for seaweed, characterized in that the seaweed is rubbed between it and a rotary disk.