JPS6317430B2 - - Google Patents

Description

[Detailed description of the invention]

(a) Industrial Application Field 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 sheet 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. It was deteriorating. In addition, recently, bulk dried products and vacuum freeze-dried products have been seen, but because the leaves are dried as they are, 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 seaweed drying method characterized by performing an operation of pinching and rubbing the seaweed in the process of reducing the moisture content of the seaweed from 70% to 45%, and a perforated rotary disk with permeable holes, and a structure that is distributed on the rotary disk. The rotary blades are carefully arranged, and the rotary disk is equipped with a blower for blowing air from below, and the seaweed is pinched and rubbed between the lower end surface of the rotary blade and the perforated rotary disk. The drying equipment for seaweed is characterized by: 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),
Immediately perform centrifugal dehydration, or perform centrifugal dehydration without rinsing. In this way, the water content is approximately 75-85%
Obtain dehydrated seaweed fronds. This is then subjected to a drying process and dried through ventilation until the moisture content is approximately 30%. During this drying process, the moisture content is reduced from about 70% to about 45%.
In the process of reducing the amount of seaweed to 50%, the seaweed is pinched and rubbed. The operation of pinching and rubbing the seaweed, so-called kneading, is performed by moving the kneading hands and the kneading surface in opposite directions, or by moving 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, reference numeral 1 denotes a rotating blade, which is made up of two Teflon plates 2, 2 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 applied to the Teflon plates 2, 2. Further, the lower surface 2' of the Teflon plates 2, 2
As shown in the figure, the Teflon plate is formed at an angle of, for example, 30 to 60 degrees with respect to a multi-hole rotary disk, which will be described later, and the thickness of the Teflon plate is, for example, 3 to 10 mm. 4 is a perforated rotary disk with ventilation, 50 to 100
It is made up of a mesh stainless steel net 5 stretched over a frame 6, and a rotating shaft 8 of a motor 7 is attached to the center of the frame 6. Reference numeral 9 denotes a wind box provided on the lower surface of the multi-hole rotary disk 4, which has an inlet 10 for dry air and a rectifying plate 11 inside. Further, the shaft 3 of the rotary blade 1 is eccentrically arranged with respect to the rotary shaft 8 of the motor 7. 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 disc 4, which serves as the kneading surface, is moved in the opposite direction by the motor 7. Rotate. At the same time, dry air is introduced from the inlet 10, and the rectifying plate 11
The air rectified by the net 5 is introduced from the lower surface of the net 5. The seaweed on the net is dried by ventilation,
Being massaged. 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 mm was used as a rotary blade, and a 60 mesh sieve was used as a perforated rotary disk. In addition, the criterion was that the sample was cut into 2 cm square pieces and passed through a 4 mm square sieve in an amount of 90% or more by weight after shrinkage. The sample was seaweed produced in Aichi Prefecture, weighing 10g in terms of dry matter. The above sample was dried in advance to the moisture content shown in Table 1, and then placed in the device shown in the figure and rubbed while being ventilated. Two examples will be shown below. (1) Atmosphere 28℃, Humidity 60% Rotation speed of impeller 300 times/min Sieve 〃 100 times/min Distance between impeller and sieve 1mm Under the above conditions, start kneading from the moisture content in Table 1 until the final moisture content is 30 %, the moisture content at the start of kneading was 70% or more. (2) Atmosphere 28℃, Humidity 60% Rotation speed of impeller 300 times/min Sieve 〃 100 times/min Distance between impeller and sieve 1mm Under the above conditions, the seaweed with a moisture content of 80% was kneaded to the moisture content in Table 2. Then, the blade was raised and drying air was sent to the porous disk to dry it to 30%. As a result, the moisture content at the end of kneading was 45% or less, which was good.

【table】

[Table] Example 2 Atmosphere 40℃, Humidity 30% Air volume ^1m3 /min Number of rotations of blades 300 times/min Sieve 100 times/min Initial moisture of seaweed 80% by weight Final moisture of seaweed 40 Size of seaweed Approximately 3 cm square When dehydrated seaweed leaves were cut into approximately 3 cm square pieces and dried under the above conditions, even if the distance between the blades and the sieve was increased, a good product could be obtained by increasing the amount of seaweed input. Got the results. 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 mm square sieve.

[Table] The seaweed that has undergone the drying and kneading process described above is then roasted to become 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 will be one in which the 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 the drawing]

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. . 1... Rotating blade, 4... Multi-hole rotary disk, 9... Wind box.

Claims (1)

[Claims] 1. When drying seaweed, the water content of seaweed is 70%.
A method of drying seaweed that is characterized by an operation of pinching and rubbing the seaweed during the process of drying it to 45%. 2. A perforated rotary disk with ventilation, a rotary blade eccentrically arranged on the rotary disk, a blower device for blowing air from below to the rotary disk, and a lower end surface of the rotary blade and a rotary blade arranged eccentrically on the rotary disk. A drying device for seaweed, characterized in that the seaweed is pinched and rubbed between the seaweed and the seaweed.