JPH0286726A - Far infrared hot drying unit - Google Patents

Abstract

PURPOSE:To prevent food cooking variation by setting up, near at least both ends of a carrying means, plate-like secondary emitters extending along the carrying direction so that the inner surfaces thereof represent sharp angles against the carrying plane of said carrying means. CONSTITUTION:A food to be hot-dried is carried into and taken out of, using chain conveyors 10, a far infrared heating unit; during which the food is heated through far infrared heaters 4 each with a reflective plate and plate-like secondary emitters 20. The emitters 20 are extended along the chain conveyors 10 and set up near the respective chains so that each angle between the inner surface 21 of the emitter 20 and the carrying plane 10a represent a sharp angle.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a far-infrared heating drying device, specifically, a method for drying bread,
This invention relates to a far-infrared heating and drying device suitable for commercial use in processing or cooking cakes, kutskii, dried fish and algae products, meat, and the like.

(Prior art) Generally, gas ovens, electric ovens, or the sun are used as heating or drying means for processing and cooking this type of food, but these methods have poor energy efficiency and are difficult to bake, dry, etc. There was a problem that it took a lot of time. For this reason, in recent years, with a focus on the energy-saving effect of far-infrared rays, devices that use far-infrared rays for manufacturing kutuki and seaweed have been developed, and although some of them have been put into practical use,
In these devices, not only heating and drying by radiation but also heating by convection and conduction account for a large proportion, so it is difficult to say that far-infrared rays are still being fully utilized. .

On the other hand, as a result of research on cooking using far infrared rays, the present inventor discovered that far infrared rays that act most effectively on food are in the long wavelength range of 2 microns or more, and based on this knowledge, the Utility Model Application No. 1983 was filed. In specification No. 2230, a cooking device body having one or more openings for heated dry food on the side and a steam outlet at the top, and a cooking device with a heated dry food inside and outside the cooking device main body. It consists of a conveying means for loading and unloading, and a far-infrared heater that is arranged along the longitudinal direction of the cooking device body, has a reflector on the back, and emits far-infrared rays with a lower limit of wavelength in the 2 micron wavelength range. We have proposed a far-infrared cooking device with the following characteristics.

This cooker emits far-infrared rays with a long wavelength of 2 microns or more, and can continuously produce food with a taste comparable to that made using higher-quality ingredients even with the same conventional materials. The temperature is usually as low as 50 to 60°C, at most 80°C or less, and therefore has the advantage of low heat loss.

(Problems to be Solved by the Invention) However, when the far-infrared cooker is used for commercial purposes, it has become clear that because it heats only by radiation, it causes different problems than conventional electric ovens, etc. For example, if the above-mentioned far-infrared cooking device is adopted as a commercial bread making machine, and containers containing bread dough are placed close to each other and baked across the entire width of the conveying means, as in a conventional electric oven, etc. If the distance between adjacent container walls is narrow, the portion of the bread dough in contact with the container wall or the outer portion of the dough in the container placed near both ends of the conveyance means will not be baked sufficiently, resulting in uneven baking. There is a problem.

This problem can be partially solved by increasing the distance between the containers containing the dough, but even in this case, the outer portions of the dough in the containers placed near the ends of the conveying means are sufficient. It became clear that in order to prevent this, the containers had to be lined up only in the center of the conveyance means, which inevitably led to a decrease in the production amount per unit time. .

Therefore, an object of the present invention is to obtain a far-infrared heating drying device suitable for commercial use that can process or cook foods with high efficiency.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides an apparatus main body having an opening in the side wall portion for carrying in and carrying out the heated dry food and a steam exhaust port in the upper part; a conveying means extending from one end of the apparatus main body to the other end and transporting the heated dry food into and out of the apparatus main body through the opening; , in a far-infrared heating drying device comprising a far-infrared heater that emits far-infrared rays having a wavelength range of 2 microns at the lower limit, and a reflecting plate disposed on the back of the far-infrared heater, at least both ends of the conveying means A plate-shaped secondary radiator extending along the conveying direction is disposed nearby so that its inner surface forms an acute angle with the conveying surface of the conveying means.

Further, in the present invention, a metal reflector is provided on the outer surface of the plate-shaped secondary radiator in order to further improve heating efficiency.

Furthermore, if necessary, a plate-shaped secondary radiator may be disposed in the central region of the conveying means, extending parallel to the conveying direction and perpendicular to the conveying surface. In this case, it is preferable to use a plate-shaped secondary radiator having a sandwich structure with a reflector sandwiched therebetween.

As the material of the plate-shaped secondary radiator, any ceramic material such as old ceramics or new ceramics can be used, but in general, A(, Ti, Si, Zr
, Mg, Fe, Ca, Cr.

Conventionally known far-infrared radiator materials such as oxides, composite oxides, carbides, and nitrides of at least one metal selected from the group consisting of Co and Ni, such as betalite, zirconia, alumina, titania, silica, magnesia, AC,
0,*T I O,,A(,03・SiO2,ZrO
7.CaO etc. are suitable.

The far-infrared heaters may be disposed above and below the apparatus main body facing each other across the conveying surface of the conveying means, or may be disposed along the left and right side walls of the apparatus main body with the conveying surface sandwiched therebetween. However, in either case, it is preferable to provide heater position adjusting means for moving the vertical and/or left and right heaters so that they can approach each other. Note that when producing thin foods such as roasted seaweed, it is not necessarily necessary to arrange far-infrared heaters facing each other across the conveying surface of the conveying means (for example, on one side of the conveying surface, A far-infrared heater may be provided only on the upper side.

As the far-infrared heater, any type of heater such as a rod-shaped heater or a plate-shaped heater can be used. In the case of rod-shaped heaters, each rod-shaped heater is arranged in a direction perpendicular to the conveying direction of the dried food to be heated, and a reflector with a substantially arc-shaped cross section extending in the same direction is arranged on the back side of each rod-shaped heater. It is preferable to do so.

Further, in the case of a plate-shaped heater, a reflector is arranged closely to the back surface of the plate-shaped heater or separated therefrom.

By controlling its temperature, far infrared heaters
In other words, the peak wavelength of the emitted far infrared rays changes by controlling the power supply, but in the present invention, far infrared rays in the wavelength range most suitable for heating and drying food, specifically, The lower limit is 2 microns, i.e. 1.5-2
, 4 microns.

Any conveyance means C may be used, such as a heald conveyor or a chain conveyor, and trays, metal rods, metal plates, etc. may be fixed or removably attached between the chain conveyors. The trays and the like are usually made of stainless steel, aluminum, or other metals, and the surfaces are roughened or coated with paint to make them non-glossy. Further, the conveying means does not necessarily have to be of a type that conveys in only one direction, but may be of a reciprocating type.

(Function) In the far-infrared heating drying device according to the present invention, far-infrared rays with a wavelength of 2 microns or more are emitted from the far-infrared heater, and the far-infrared rays are transmitted through the conveying means, tray, container, etc. The heated and dried food is heated or dried by radiation.

The plate-shaped secondary radiator absorbs far-infrared rays from the far-infrared heater in the initial stage of heating, but after absorbing a certain amount, it emits far-infrared rays, and as a result, the heated dry food placed on both ends of the conveying means The outer portion of the burner receives the radiant energy from the far-infrared heater and the radiant energy from the secondary radiator, thereby preventing under-burning.

In addition, if a reflector is provided on the back side of the secondary radiator, the far infrared rays emitted from the secondary radiator to the back side will be reflected by the reflector toward the heated and dried food, which will prevent heating and drying. will be further promoted.

The dried food to be heated generates steam during the process of heating and drying, but this steam is discharged to the outside from the steam outlet provided at the top of the device body, thereby preventing the radiant energy from attenuating due to the steam. If a heat retention/fermentation chamber is provided adjacent to this steam outlet and the steam discharged from the steam outlet is used as a heat source for the heat retention/fermentation chamber, by placing heated dry foods in the heat retention/fermentation chamber, Alternatively, a second conveyance means extending into and out of the heat retention/fermentation chamber is provided, and the heated dry food is placed on this conveyance means and passed through the heat retention/fermentation chamber to keep the heated dry food warm and/or fermented. Can be done.

When dry food to be heated, such as meat, is hung directly on the conveying means and heated from both sides with a heater,
Although this does not pose any particular problem, if heated and dried foods such as bread dough are transported in metal trays or containers, the surface of the tray or container should be roughened or a coating film should be applied to the surface. It is necessary to form a non-glossy surface. This is because if the surface of the tray etc. is a metallic glossy surface, the radiant energy will be reflected on that surface and will not be able to pass through the tray etc.

Furthermore, by making the far-infrared heater movable forward and backward relative to the conveying surface, far-infrared radiation can be emitted from a distance depending on the size and type of the dried food to be heated, and attenuation is inversely proportional to the square of the distance. This can solve the problem unique to far infrared rays.

(Examples) Hereinafter, the present invention will be specifically described with reference to drawings showing examples of the present invention.

The illustrated far-infrared heating drying apparatus basically consists of an apparatus main body 1, a chain conveyor 10 serving as a conveying means for carrying heated and dried food into and out of the apparatus main body 1, and a conveyor 10 that is placed in a relative position across the conveying surface. a far infrared heater 4 arranged as
It is composed of a reflecting plate 5 disposed on the back of the far-infrared heater 4, and plate-shaped secondary radiators 20 made of ceramics disposed near both ends of the conveying means along the conveyance direction. There is.

The apparatus main body 1 consists of a frame 9 and side wall plates, and has openings 2a and 2b at both ends thereof, and a steam outlet 3 formed at the top. The front and rear side wall plates 9a of the device main body 1 are detachably attached to the frame 9, and the reflector plate 5
This allows the surface to be cleaned. side wall tli29
A is made of stainless steel with a glossy inner surface. The temperature of this side wall plate inside the device body 1 is usually 50°C.
Since the temperature rises only up to ~60°C, it is not necessarily necessary to have a heat insulating structure, or it may be a heat insulating structure in which a heat insulating material is interposed between two metal plates.

A heat retention/fermentation chamber 17 is formed at the top of the apparatus body 1 surrounding the steam outlet 3, and this heat retention/fermentation chamber 17 communicates with the inside of the apparatus body 1 via the steam outlet 3 and is shielded by M2S. has been done. A non-glossy punching plate 19 with numerous holes is provided at the steam outlet 3, and one or more shielding plates (not shown) made of a stainless steel plate and having a glossy surface are mounted on the punching plate 19. By placing the 2), it can be isolated from the inside of the main body of the device.

The far-infrared heater 4 is made by coating a far-infrared radiation ceramic material on the surface of a rod-shaped carrier containing a heating wire such as a nichrome wire, and is arranged above and below the device body 1 across the conveying surface of the conveying means described later. Each heater extends in a direction orthogonal to the transport direction of a transport means, which will be described later.

At the back of each far-infrared heater 4, a reflecting plate 5 made of metal such as aluminum and having an arcuate cross section is disposed. The position of each support frame 6a, 6b can be adjusted by a heater position adjustment means composed of a bolt 7 and a nut 8.

Each chain of the chain conveyor 10, subblock [1]
It is driven by a motor 12 via a power transmission chain 13 and a sprocket 14. A tray 15 is mounted between the chains, and this tray 15 is made of stainless steel like the punching plate H9, but its surface is coated with fluorocarbon resin, for example.
The surface is coated with Teflon or other material to give it a black, non-glossy surface.

The motor 12 is controlled by a control panel 16, and the conveyance speed can be set to an arbitrary value depending on the dried food to be heated.

The secondary radiator 20 extends along the chain conveyor 10, and has an angle θ formed between its inner surface 21 and the conveying surface 10a.
The chain is arranged near each chain so that the angle is an acute angle (see Fig. 2). The angle θ can be set arbitrarily, but is usually set within a range of 60 degrees or more and less than 90 degrees. Furthermore, an aluminum foil 22 is pasted on the back surface of the plate-shaped secondary radiator 20 as a reflector.

In addition, as shown by broken lines in FIG. 2, secondary radiators 20° may be added in the central region of the conveying means, and these are arranged at right angles to the conveying plane. In addition, when a reflector is used in combination, it may be installed in a structure in which aluminum foil is sandwiched between ceramic plates.

In use, the control panel 16 starts energizing the far-infrared heater 4 and starts the motor 12. Next, the cases 23a, 23b, and 23c containing heated dry foods, such as Shokunokun dough, are transferred to the Che-7 conveyor 10.
When placed on the tray 15 at a predetermined interval, the bread dough introduced from the carry-in opening 2a side is exposed to radiant energy from the far-infrared heater 4 below, which passes through the tray 15 and case 23, and far-infrared rays above. The bread is baked by the radiant energy from the heater 4, and the baked bread is carried out through the carrying-out opening 2b.

In order to increase production efficiency, when baking dough is lined up in multiple rows (three rows in FIG. 2) on the conveyor 10 as shown in the figure, without the secondary radiator 20, the dough placed in the outer cases 23a and 23c is However, in the apparatus according to the present invention, secondary radiators equipped with reflectors are arranged on both sides of the chain conveyor 10, so this problem does not occur. .

The shielding plate disposed in the heat retention/fermentation chamber 17 may be slightly shifted from the completely sealed state of the steam outlet 3 to leave a gap depending on the type of dried food to be heated.

In addition, the steam generated during heating is removed from the punching plate 1.
It flows into the thermal insulation/fermentation chamber 17 through the hole 9, and becomes a heat source to warm the inside. Therefore, if you put bread dough and finished products in the heat-retaining and fermentation chamber, they will ferment.
Or you can keep it warm.

By the way, nine 250W far infrared heaters 4 with a length of 700mm are arranged on the top and bottom at intervals of 125mm+, the diameter of the reflector is 100mm, and a petalite plate is used as a secondary radiator at an acute angle of about 85 degrees. When the cases 23 filled with bread dough were lined up in three rows on the conveyor IO and moved at a speed of 100 mm per minute using the installed heating drying device, they were continuously baked, and the temperature inside the device body was approximately Although the temperature was 40°C, the bread was baked evenly, with a moderate amount of browning, and a good taste.

In the above embodiment, the far-infrared heater is arranged horizontally, but as shown in FIG.
They may be arranged vertically along the side wall of the device body 1, or may be arranged vertically, horizontally, and vertically of the device main body 1. Further, when the heaters are arranged along the side walls and the conveyance means 10 conveys the heaters between them, the secondary radiators 20 may be arranged on both sides and above and below the conveyance means 10, respectively.

(Effects of the Invention) As is clear from the above description, according to the present invention, by arranging plate-shaped secondary radiators on both sides of the conveying means, radiant energy can be increased without increasing power consumption. Because it can heat many foods continuously,
A far-infrared heating drying device that can be processed to efficiently obtain high-quality products and is suitable for commercial use can be obtained.

In addition, since the heating drying device directly heats the dried food to be heated using far-infrared radiant energy, the temperature inside the device itself does not rise significantly (also, the far-infrared Since the far-infrared rays are emitted from the far infrared rays toward the center, and the distance of the far-infrared heater exposed to the heated dry food can be changed, the time required for baking and drying each food can be shortened, and the finished product can be beautifully finished. can.

Furthermore, since the far-infrared heater emits far-infrared rays with a wavelength of 2 microns or more, it is possible to give the heated dry food an appropriate brown color, and the heated dry food is heated while moving inside the device. Because of this, breads, cakes, etc. are eaten continuously.

Baked keys, seaweed, tea leaves, wakame, konbu,
Not only bonito flakes and other dried products, but also meat can be grilled.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing one embodiment of the far-infrared heating drying device according to the present invention, FIG. 2 is a partially sectional front view thereof, and FIG. 3 is an explanatory diagram of main parts showing another embodiment. . l: Device main body, 4: Far infrared heater, 5: Reflector, 6:
Support frame, 7.8: Heater position adjustment means, 10: Chain conveyor (conveying means), 15: Tray 16 control panel, 17: Heat retention and fermentation chamber, 20 - plate-shaped secondary radiator, 22
~Reflector.

Claims (8)

[Claims] (1) A device body having an opening in the side wall for carrying in and carrying out heated dry food and a steam exhaust port in the upper part, and a device body extending from one end of the device body to the other end, into and out of the device body. A conveyance means for carrying in and out the heated dry food through the opening, and a far-infrared ray disposed on at least one side of the conveyance surface of the conveyance means, which emits far-infrared rays having a lower limit of wavelength in a wavelength range of 2 microns. In a far-infrared heating drying device comprising a heater and a reflector disposed on the back of the far-infrared heater, a plate-shaped secondary radiator extending along the conveying direction is provided at least near both ends of the conveying means. A far-infrared heating drying device, characterized in that the angle formed between the inner surface of the device and the conveying surface of the conveying means is an acute angle. (2) The far-infrared heating drying device according to claim 1, wherein the plate-shaped secondary radiator includes a reflector on its outer surface. (3) The far-infrared heating drying device according to claim 1 or 2, wherein the far-infrared heater is mounted on the main body of the device so as to be movable toward and away from the conveying surface of the conveying means via a position adjustment means. (4) The far-infrared heater is composed of a plurality of rod-shaped heaters, each rod-shaped heater is arranged in a direction perpendicular to the conveying direction of the conveying means, and an arc-shaped cross section extending in the same direction is provided on the back side of each rod-shaped heater. Claim 1: A reflective plate is provided.
The far-infrared heating drying device according to any one of 3 to 3. (5) The far-infrared heater is composed of at least one plate-shaped heater, and a reflector is arranged closely to the back surface of each plate-shaped heater or at a predetermined interval from the back surface. The far-infrared heating drying device according to any one of claims 1 to 3. (6) Claims 1 to 3, wherein the far-infrared heater is disposed opposite to both sides of the conveying surface of the conveying means, with the conveying surface interposed therebetween.
5. The far-infrared heating drying device according to any one of 5. (7) The far-infrared heating drying device according to claim 6, wherein the conveyance means has a horizontal conveyance surface, and the far-infrared heaters are disposed opposite to each other above and below the conveyance surface. (8) The conveyance means has a vertical conveyance surface, the far-infrared heater is arranged on both sides of the conveyance surface, and plate-shaped secondary radiators are arranged near the upper and lower ends of the conveyance means and on both sides. The far-infrared heating drying device according to claim 6, further comprising: a.