JP2006158260A - Laver roasting oven device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laver roasting oven device enabling such roasting technique as to bring out color, luster and taste inherent in laver. <P>SOLUTION: The laver roasting oven device is structured as follows: a far-infrared heater and a heater other than the far-infrared heater are disposed under a reflection plate; and a plurality of units where a plurality of units independently regulated are placed in lines, are put on a belt conveyer in a plurality of stages so as to enable independent control of the far-infrared heater and the heater having wavelength greater than near-infrared wavelength using a thyristor. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a laver grilling pot device combining a far-infrared heater suitable for baking primary dried raw laver and a heater having a wavelength of near infrared or longer.

  Conventionally, a nibama glass heater, a far infrared heater, or both of them are combined in a kiln that produces dried laver by further drying or baking raw laver that has undergone primary drying such as dehydration and sun drying. It was used.

  When using a nichrome wire glass heater, only the surface of the seaweed is baked, so the baked color and fragrance are good, but since it is not baked from the core, the color will return over time after baking and the phenomenon of tempering Has happened. In addition, when the seaweed was dried with high heat, it became darkened, and the chlorophyll was destroyed by heat, so the scent disappeared.

  Therefore, if this is dried with a far-infrared heater, a green and fragrant nori will be produced. However, when laver is dried with a far-infrared heater, it is baked from the core of the laver so that it does not temper, but there is a problem that the color and fragrance are inferior to those of nichrome wire glass heaters. This is a common problem, even if a single unit of nichrome wire glass heater or far infrared heater is combined, and this is a common problem.

  In order to solve the trade-off, there is known a technique in which at least one surface of a hot plate is coated with a far-infrared radiation material in a domestic or small-scale baked laver for business use (Patent Document 1).

Further, a technique for emitting both far infrared rays and near infrared rays from a single lamp by coating a part of a bulb of an infrared radiation lamp with a far infrared radiation film is also known (Patent Document 2).
JP-A-4-298000 Japanese Patent Application 2001-384158

    The standard of seaweed is classified by the weight per 100 pieces in a size of width 190 mm × length 210 mm, and less than 300 g is classified as a light grade, 300 to 350 g as a main grade, and 350 g or more as a heavy grade. However, even the laver in the same production area actually has different dry seaweeds with different producers, date of collection, sea area, etc., and the thickness of the dry seaweed due to differences in the ingredients contained in natural products is largely dependent on the visual inspection of the inspector. . In other words, the most difficult thing to make in product manufacturing is to finish the product with a uniform color as much as possible regardless of the heat of the raw materials. Manufacturing process management is required.

  The problem to be solved by the present invention is to finish various seaweeds with characteristic variations in one continuous kettle with finished quality that meets the characteristics and customer needs.

  In the method of Patent Document 1, in addition to the conventional heat treatment by the heater, the far-infrared radiation material is coated on the hot plate to burn the nori using the far-infrared treatment, but the characteristics of the raw nori and the variation between lots The ratio of far infrared rays cannot be adjusted according to the above.

  In the method of Patent Document 2, if the ratio of far infrared rays and near infrared rays is to be changed, it is necessary to change the far infrared radiation film covering portion of the bulb of the infrared radiation lamp, and the work can only be done after the lamp has cooled down. If you try to use it on the production line, it can only be used in mass production with fixed settings, so you can't cook it in response to lot variations in raw seaweed.

  In order to solve the above-mentioned problems, the present invention has a transport means for transporting laver, and in a laver baking pot device that performs a plurality of drying processes on the transported laver, a far-infrared heater and a near-infrared heater are provided under the reflector. A heater having a wavelength greater than or equal to the infrared is provided together with the temperature measuring means, and the far infrared heater and the heater having a wavelength greater than or equal to the near infrared can be individually adjusted.

  As a result, arbitrary heating from the surface of the seaweed to the core can be performed, and the heat treatment corresponding to the lot variation of the laver changing depending on the production place and the production time has become possible.

  In addition, ceramic far-infrared heaters were used for far-infrared heaters, and nichrome wire glass heaters were used for heaters with wavelengths longer than near infrared.

  As a result, the response to temperature changes can be made faster, and subtle temperature management has become possible.

  In addition, thyristors are used to control the temperature of far infrared heaters and heaters with wavelengths longer than near infrared.

  This enables stable continuous proportional control (phase control) and frequency division control by using a thyristor with a semi-permanent lifetime, and soft start and soft down can be performed when switching the switch, so no noise is generated. The life of the heater can be extended.

  The laver pot according to the present invention uses a far-infrared heater that heats the interior of the laver that can be individually set for temperature and a heater other than the far-infrared heater that heat-treats the surface of the laver, and uses a common reflector to make both uniform By dispersing and radiating, the optimal baking condition can be realized for the laver with different production areas and production times.

  FIG. 1 is an example of a wavelength distribution of a far-infrared heater used in the present invention and a heater having a wavelength of near-infrared or less. The far infrared ray is a name of a wave having a wavelength distribution 3 of several microns to approximately 100 μm. In this embodiment, the far infrared ray is generated using the ceramic far infrared heater 1. In the present invention, a heater having a wavelength 4 equal to or greater than near infrared is also used. In the present embodiment, the nichrome wire glass tube heater 2 is used. In the present invention, as will be described later, the band energy 5 generated by the far-infrared heater 1 and the energy 6 generated by the nichrome wire glass tube heater 2 are individually controlled to thereby control the far-infrared band energy 5 and the nichrome wire glass tube. It is a mechanism capable of baking seaweed by combining the energy 6 generated by the heater 2 in a well-balanced manner.

  FIG. 2 is an example of a composite unit of a far infrared heater 1 and a nichrome wire glass tube heater 2 used in the present invention. The far-infrared heater 1, the nichrome wire glass tube heater 2 and the temperature sensor 23 are in a common reflector unit 7, and the side surface of the reflector unit 7 is the heat of both the far-infrared heater 1 and the nichrome wire glass tube heater 2. It is shaped to irradiate the seaweed sheet as uniformly as possible. Here, it is preferable to use a mirror having a high reflectance so that the inner wall portion of the reflector unit 7 efficiently reflects from the far infrared wavelength to the near infrared wavelength or less.

  Further, the relative positional relationship between the far infrared heater 1 and the nichrome wire glass tube heater 2 may be arranged vertically as shown in FIG. 2 (a), arranged side by side, or at other angles. May be arranged. Similarly, the position of the temperature sensor 23 may be on the heater or on the side.

  The shape of the reflection unit 7 is preferably a circular side structure so that the waves from the far-infrared heater 1 and the nichrome wire glass tube heater 2 irradiate the laver sheet as uniformly as possible, as shown in FIG. However, the present invention is not limited to this.

  FIG. 3 is an example of a three-stage type laver baking pot device having a structure divided into three units of an inlet unit 8, an intermediate unit, and an outlet unit. Here, each unit has a reflector unit 7 in which a plurality of heaters are incorporated. In FIG. 3, the number of reflector units 7 is three, but in a normal mass production line, six to seven reflector units 7 are provided. It is preferable to provide it. Also, the unit configuration is not limited to the three-stage configuration as shown in FIG. 3, and the number of units can be increased or decreased in accordance with the quality of the seaweed and the processing requirement specifications.

  The laver sheet 11 is placed on the roller belt 14 that moves upward from the lower surface of the entrance roller 12 and changes its direction in the horizontal direction, and enters the laver baking pot device. From here, the laver sheet passes through the entrance unit 8, the intermediate unit 9, and the exit unit 10 in order, and is irradiated with waves from the ceramic far-infrared heater 1 and the nichrome wire glass tube heater 2 from each reflector unit 7. The best color, luster, and taste of the seaweed are brought out.

  Here, the far-infrared heater 1 and the nichrome wire glass tube heater 2 incorporated in the reflector unit 7 placed in each unit case 15 can be individually controlled. Actually, detailed settings are made based on experience and experiment. For simplicity, for example, if two settings are set, ie, a high temperature setting “high” and a low setting “low”, Table 1 and The settings shown in Table 2 can be considered. By saving these profile setting values in the control system, the settings can be changed in a short time, so the laver pot system that can handle a wide variety of products with high work efficiency. It becomes.

  In Table 1, the output of the far-infrared heater is increased and the output of the near-infrared heater is weakened for the purpose of drying the interior of the laver first at the entrance. In the next intermediate part, the output of the far-infrared heater is lowered and the output of the near-infrared heater is increased, and the outer skin of the laver is baked. At the finishing exit, the output of the far-infrared heater and near-infrared heater is controlled carefully to finish the aroma and flavor of the seaweed.

  When temperature uniformity in the unit is important, arrange the near infrared heater on the front side of the reflector unit 7 in the nori transport direction and the far infrared heater on the rear side of the reflector unit 7 in the nori transport direction. The temperature drop at the exit side of the reflector unit 7 can be improved.

  High-power heaters are expensive and maker inventory is low, so manufacturing factories that use electric furnaces need to have extra inventory. However, with the above configuration, a large amount of thick seaweed can be processed even if a heater of a popular price range is used, so that the production cost including the cost for erasing consumables such as the heater can be reduced.

  In Table 2, in the initial stage of the entrance part, first, the outer skin of the seaweed is warmed in the high near-infrared state irradiated from the nichrome wire glass tube heater 2 to contain the scent of the seaweed inside, and then in the middle stage by the far-infrared heater 1 The inside of the seaweed is warmed and expanded, and in the latter period, the outer skin is warmed and finished again.

  Furthermore, in the middle part, the nichrome wire glass tube heater 2 is initially set to a low temperature setting and changed to a high setting in the middle period, as in the case of “Initial choro choro pappa…” as is said in rice cooking. It has returned to.

  After that, at the exit part, like the entrance part, first, the outer skin of the seaweed is warmed in the near-infrared high temperature state irradiated from the nichrome wire glass tube heater 2 to contain the scent of the seaweed inside, and then the far-infrared in the middle term Heater 1 warms the inside of the seaweed and expands it inside, and in the second half, it warms and finishes the outer skin again.

  The example in Table 2 is a heater setting method used when baking relatively high-quality seaweed, and local heat treatment is possible by using a high-power type heater. Even in the case of high-class seaweed, the characteristics vary slightly depending on the production lot and production time depending on the delivery lot, and a wide variety of seaweed is introduced, so we will optimize the settings of each heater according to the characteristics of the seaweed However, in the system of the present invention, a remote sensor unit 18 composed of an infrared sensor, an ultrasonic sensor, or the like is placed in the vicinity of each reflector unit so that it can be contacted from a remote distance before and after passing through each unit. It is conceivable to measure laver sheets individually. By parameterizing data from the remote sensor unit and grasping the degree of seaweed burn in a simulated manner, it becomes possible to qualitatively control the state of seaweed burnt. By using this seaweed baking condition data, it is possible to measure the real-time status of the seaweed in a pseudo real-time, and by feeding back the seaweed baking condition data to the system, detailed real-time control of the seaweed baking according to each laver is possible. It becomes possible.

  Furthermore, the height of the far-infrared heater and the heater with a wavelength shorter than the far-infrared wavelength from the belt conveyor is arbitrary, and it is not necessary to arrange the individual reflector units at the same height, and it can be easily adjusted up and down at any time. It is also possible to adopt a simple structure.

  FIG. 4 is an example of a system using the far infrared heater 1 and the nichrome wire glass tube heater 2 in the present invention using the thyristor unit 16.

  When the apparatus is turned on, a current signal of the temperature regulator 17 is output to the thyristor unit 16 according to the setting of the temperature regulator 17. After the thyristor of the thyristor unit 16 is turned on, the far-infrared heater 1 and the nichrome wire glass tube heater 2 are supplied with current until the temperature set by the setting of the temperature regulator 17 is reached. The current value during operation can be confirmed by an ammeter 19 connected in series to the switch 22.

  The temperature rise of the far infrared heater 1 and the nichrome wire glass tube heater 2 is monitored by a temperature sensor (bimetal, thermistor, etc.) 23 attached to each heater. When the temperature reaches a predetermined temperature, the temperature regulator 17 sets the load voltage of the thyristor of the thyristor unit 16 to zero, whereby the thyristor is turned off and the load current of the thyristor is cut.

  When an abnormality occurs during the operation of the far-infrared heater 1 or the nichrome wire glass tube heater 2, the temperature regulator 17 controls the disconnection switch 20 to cut off the energization by the overheat prevention function. Further, the circuit can be disconnected by the manual switch 22.

  When the above temperature rise prevention function is activated, if there is an abnormality in the heaters 1 and 2 or the heating tank, the possibility of an unexpected accident increases. The manual switch 21 is used.

  FIG. 5A is a diagram showing the operation principle of phase angle control by the thyristor unit (only the far-infrared heater part), and FIG. 5B is a diagram showing changes in the phase control current.

  In the continuous proportional control for controlling the phase angle, the effective current value is changed to an average value by opening and closing the gate of the thyristor with a pulse with respect to the AC power supply. Since it is possible to perform smooth change control rather than on / off control such as time proportional control, it is possible to perform more stable and highly accurate control.

  5A, when the operation switch provided in the change temperature controller 17 is turned on after the main body is first turned on, the signal current (usually, the temperature regulator 17 output to the thyristor unit 16 is normal. The output gradually increases from 4 mA to 20 mA, and starts softly. In the thyristor unit 16, a trigger pulse matching the phase angle of the load power supply is output from the built-in drive amplifier 24 to the thyristor 25. This pulse is applied to the gate of the thyristor 25, and the gate is opened during the period of the pulse in synchronism with the AC power supply connected to the thyristor so that a current flows.

  For example, the pulse width applied to the gate is set so that the current is cut off when the output of the temperature regulator 17 is 4 mA, 50% when the current is 12 mA, and 100% when the current is 20 mA. As described above, the load current flowing through the far-infrared heater 1 and the nichrome wire glass tube heater 2 is proportionally changed by changing the timing of issuing a pulse in accordance with the output from the temperature controller 17 and output. After the thyristor 25 of the thyristor unit 16 is turned on, the far-infrared heater 1 and the nichrome wire glass tube heater 2 are supplied with current in a fully open state until the temperature set by the temperature regulator 17 is reached, and the temperature is set to the set temperature. When approaching, the pulse width is narrowed and the temperature adjustment mode is entered.

  When the operation switch is turned off after the work is finished, the current output from the temperature regulator 17 is gradually reduced, and the pulse width is narrowed accordingly, and the effective current value is reduced to soft down.

  In this embodiment, a single far-infrared heater (ceramic infrared heater 1) and a heater (nichrome wire glass heater 2) having a wavelength longer than or equal to the near infrared are installed in one reflector unit 7. It is also possible to install a plurality of each according to the situation.

  In this embodiment, the temperature sensor 23 is installed in the vicinity of each heater in the reflector unit 7. However, at least one temperature sensor 23 may be installed for each reflector unit 7, or the heater may be installed. It is also possible to install it in a place other than the vicinity. Furthermore, when using a non-contact temperature sensor that measures the temperature of a remote place, it is conceivable that the remote sensor unit 18 also incorporates a temperature sensor.

  Since there is a high degree of freedom in the arrangement and individual control of far-infrared heaters and heaters with wavelengths below the near-infrared, only conventional far-infrared heaters, only nichrome wire glass heaters, or mixed types of these (individual control of heaters) Compared to the case of using No), it is possible to bake the original flavor of the seaweed, especially in the case of high-class products such as Setouchi and Kyushu Ariake. Product value can be increased by pulling out.

Wavelength band comparison of each heater Broadband wavelength heater unit Internal structure of Nori pot Example of temperature control system using thyristor (A) Principle of operation of continuous proportional control (b) Change in phase control current

Explanation of symbols

1 ... Ceramic far infrared heater,
2 ... Nichrome wire glass heater,
3 ... Wavelength distribution of ceramic far infrared heater,
4 ... Wavelength distribution of Nichrome wire glass heater,
5 ... Heat generation energy of ceramic far infrared heater,
6 ... Heat generation energy of Nichrome wire glass heater,
7 ... reflector unit,
8 ... The entrance unit of the laver
9 ... The middle unit of the laver
10 ... the exit unit of the laver
11 ... Nori sheet,
12 ... Inlet side roller,
13 ... Exit side roller,
14 ... conveyor belt,
15 ... Unit case,
16 ... Thyristor unit,
17 ... temperature controller,
18 ... Remote sensor unit,
19 ... Ammeter,
20 ... disconnect switch,
21 ... Individual manual start switch,
22 ... Manual stop switch,
23 ... temperature sensor,
24 ... Drive amplifier,
25 ... Thyristor.

Claims (3)

In the laver grilling pot device having a transport means for transporting the laver and performing a plurality of drying processes on the transported laver, this laver grilling pot device is arranged with a number of reflector units along the transport direction, A far-infrared heater as a heating means and a heater having a wavelength of near infrared or higher are installed in each reflector unit, and the far infrared heater and the heater having a wavelength of near infrared or higher can be individually driven and controlled. Nori pottery equipment. 2. The laver pot according to claim 1, wherein a ceramic far infrared heater is used as the far infrared heater, and a nichrome wire glass heater is used as the heater having a wavelength longer than the near infrared. The nori seaweed pot apparatus according to claim 2, wherein a thyristor is used for driving control of a far infrared heater and a heater having a wavelength longer than or equal to the near infrared ray.