JP2009136180A - Method for producing coated cereal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing coated cereal by which cereal grains are not bound with one another when coated, and a liquid additive dried after coated does not come off from the surfaces of the cereal grains. <P>SOLUTION: The method for producing coated cereal using cereal grains as raw material includes a drying process of rapidly drying the surfaces of the cereal grains, and a coating process of coating the liquid additive on the surfaces of the cereal grains after the drying process. The drying process takes such a technological means as to make the cereal grains come in contact with superheated steam to rapidly dry the surfaces of the cereal grains. The temperature of the superheated steam is 160-250°C, and the time for making the cereal grains come in contact with the superheated steam is reduced into a short time of <30 sec. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing a coated grain, and more particularly to a pretreatment step during the production of coated rice.

  Conventionally, for the purpose of nutrient enrichment or the like, the surface of the grain is coated with an additive solution containing an effective functional component. For example, Patent Document 1 describes that the grain surface is coated with an additive liquid having a weight ratio of 0.5 to 3.0%. Thus, if the amount of the additive liquid to be coated on the surface of the grain is small, it seems that the coated rice can be easily produced by a general coating method.

  However, when adding an additive solution containing a large amount of functional ingredients, the amount of additive solution to be coated on the grain surface increases, so when the additive solution is dried immediately after coating, Even though the liquid should be bound, the additive liquid coated on the surface of the grain binds to the additive liquid coated on the surface of the adjacent grain, and eventually the grains are bound together. The problem of end up occurred.

  For this reason, a stirring process is provided after the drying process to separate the bound grains, but if the grains bound by the stirring action are forcibly separated in the stirring process, the grains There was a problem that the dried additive liquid peeled off from the grain surface. Furthermore, the grain may be broken or cracked due to the impact during stirring.

  For this reason, even when the amount of the additive liquid to be coated on the grain surface is increased, the grains are not bound by the additive liquid at the time of coating, and the dried additive liquid after coating is not peeled off from the grain surface. A coating method is highly desired.

JP 2003-169611 A

  In view of the above problems, an object of the present invention is to provide a coating method in which grains do not bind to each other at the time of coating, and an additive liquid dried after coating does not peel from the surface of the grain.

  In order to solve the above-mentioned problems, the present invention provides a drying process in which the raw material is a grain and the surface of the grain is rapidly dried, and a coating process for coating the surface of the grain after the drying process with an additive liquid. In the drying step, technical measures were taken in which the grain was brought into contact with superheated steam to rapidly dry the surface of the grain.

  Moreover, the temperature of the superheated steam is 160 ° C. to 250 ° C., and the time for which the grains are brought into contact with the superheated steam is an extremely short time of 30 seconds or less.

  According to the method for producing a coated grain of the present invention, since the surface is brought into contact with superheated steam before the surface of the grain is coated with the additive liquid, the surface is rapidly dried by the action of the superheated steam. By the action of moisture on the surface rapidly evaporating, fine irregularities are formed on the surface. By forming these irregularities, the binding property of the additive liquid to the grain surface is increased, and peeling (liquid peeling) after binding is less likely to occur.

  Further, when moisture inside the grain (especially near the surface) evaporates to the outside during the drying, fine traces (tap water) are formed on the grain surface, so the grains easily absorb moisture due to this trace. It becomes a state. For this reason, when an additive liquid is added to the grain, a low molecular substance (mainly water) in the additive liquid is rapidly taken into the grain from the trace. Thereby, since the addition liquid of a grain surface part dries quickly, the binding between grains can be prevented.

  Furthermore, in the present invention, since the surface of the grain is brought into contact with high-temperature superheated steam at 160 ° C. or higher, there is an effect of sterilization, insecticidal action and egg-killing of the grain.

  The best mode for carrying out the present invention will be described with reference to FIGS. FIG. 1 is a flowchart showing manufacturing steps in the manufacturing method of the present invention. The manufacturing method of the coated grain of this invention is comprised from the drying process (step S1) which processes the surface of a raw material with superheated steam, and the coating process (step S2) which coat | covers the surface of a raw material. FIG. 2 is a perspective view of the drying device 2 used in the drying process, and FIG. 3 is a side sectional view of the drying device 2. FIG. 4 is a view for explaining the superheated steam piping of the drying device 2, and is a top partial sectional view of the drying device 2. In addition, although the present Example demonstrates the case where the grain which is a raw material is a rice grain, the raw material of the coating grain of this invention is not necessarily limited to a rice grain, If it is a granular grain, it can be used as a raw material It is.

  First, the drying apparatus 2 will be described. In the drying process (step S1) of the present invention, it is necessary to spray superheated steam on the raw material. Therefore, in this invention, the said drying process is performed, conveying a raw material with the belt conveyor 8. FIG. Reference numeral 3 denotes a hopper. A shutter 4 and an opening / closing device 5 for opening and closing the shutter 4 are provided below the hopper 3. A trough 6 is disposed below the hopper 3 and serves as a trough for the feeder 19 for supplying the raw material uniformly in the form of a belt 7. Note that a mesh-like belt 7 is used for spraying superheated steam uniformly on the raw material. Reference numeral 20 denotes a guide for preventing the belt 7 from meandering.

  A driving pulley 9a and a passive pulley 9b are disposed at both ends of the belt conveyor 8, and the belt 7 is wound around the driving pulley 9a and the passive pulley 9b. The drive pulley 9 a is connected to the motor 21.

  Reference numeral 10 denotes a drying unit installed on the support base 11, and the drying unit 10 sprays superheated steam on the raw material. Since the inside of the drying part 10 becomes high temperature because superheated steam is jetted from the air outlet 12, a heat insulating plate having excellent heat insulation is used for the outer wall 22 of the drying part 10. Further, the drying unit 10 has a tunnel shape, and is configured such that the raw material conveyed by the belt conveyor 8 passes through the inside thereof. The raw material on the belt conveyor 8 is carried into the drying unit 10 from the carry-in port 13a of the drying unit, and is carried out from the carry-out port 13b. The carry-in port 13a is provided with a shutter 14a fixed by a fastener 15a, and the size of the opening of the carry-in port can be adjusted by the shutter 14a. Similarly, the discharge port 13b is provided with a shutter 14b fixed by a fastener 15b, and the size of the opening of the carry-out port can be adjusted by the shutter 14b.

  A superheated steam supply port 16 is disposed in the upper part of the drying unit 10, and superheated steam is supplied from a separately provided superheated steam generator (not shown). The temperature of the superheated steam may be in the range of 200 ° C to 250 ° C. The superheated steam supplied from the supply port 16 is sent to a plurality of blast pipes 18 arranged in a direction intersecting the belt 7 via a supply pipe 17, and a plurality of jets provided in the blast pipe 18. It is injected toward the raw material from the air vent 12.

  The superheated steam needs to be uniformly injected toward the raw material. For this reason, the blast tube 18 is provided with a plurality of blast ports 12 as shown in the drawing so that superheated steam is uniformly ejected with respect to the raw material uniformly fed onto the belt 7. . The blast port 12 may be formed by opening a hole in the blast tube 18, and the length of the hole may be 5.0 mm or less. In the present invention, the diameter of the hole of the blast port 18 is 2.0 mm.

  Further, a plurality of blast tubes 18 are arranged above and below the belt 7 so that superheated steam is injected from both above and below the raw material. The reason why the mesh-like belt 7 is used is to allow the superheated steam sprayed from the blast tube located below the belt 7 to be blown onto the raw material.

  Moreover, the dotted line 24 in FIG. 4 is for demonstrating one example of arrangement | positioning (positional relationship) of the blast nozzle 12. FIG. It is desirable to arrange the blast port 12 at a position that is not aligned with the blast ports 12 of the front and rear blast tubes 18 in the direction in which the raw material is conveyed. FIG. 4 is a diagram for explaining the position of the blast port 12, and each blast port 12 is arranged in a direction facing the raw material on the belt 7 of the blast tube 18. That is, the blast port 12 of the upper blast tube 18 is provided below the blast tube 18, and the blast port 12 of the lower blast tube 18 is provided above the blast tube 18.

  The lower outer wall 22 in the drying unit 10 is formed with an inclined surface 25 for allowing the condensed water and washing waste water generated in the drying unit 10 to naturally flow to the valve 23 serving as a discharge port. Water can be easily discharged from the drying unit 10 by opening the valve 23.

  Next, a drying process (step S1) is demonstrated. The raw material supplied to the hopper 3 of the drying device 2 is supplied uniformly from the lower part of the hopper 3 to the belt 7 from the trough 6 of the feeder 19. In this case, as the grain layer of the raw material on the belt 7 is thinner, superheated steam can be sprayed onto the raw material surface more uniformly, so it is desirable to supply the raw material onto the belt 7 so as not to overlap.

  The raw material uniformly supplied onto the belt 7 by the feeder 19 is conveyed by the belt conveyor 8 driven by the motor 21, and is carried into the drying unit 10 from the carry-in port 13a. The surface of the raw material carried into the drying unit 10 is superheated by the superheated steam ejected from the plurality of jet nozzles 12 provided in the jet pipes 18 disposed in the drying unit 10 while being conveyed on the belt 7. It is dried quickly. Due to this rapid drying, moisture on the surface of the original grains evaporates in a short time.

  The evaporation forms minute irregularities on the surface of the original grains, and the irregularities enhance the binding property of the additive liquid to the raw material surface during coating.

  Further, when moisture inside the raw material (especially near the surface) evaporates to the outside during the drying, a fine trace (tap) is formed on the grain surface, so that the grain easily absorbs moisture due to this trace. It becomes. For this reason, when an additive liquid is added to the grain in which the trace is formed, a low molecular substance (mainly water) in the additive liquid is rapidly taken into the grain from the trace. Thereby, since the water | moisture content of the additive liquid of a grain surface part reduces, the additive liquid of a grain surface part dries quickly, By this effect, binding of grains can be prevented.

  In addition, the said drying process is performed while the grain conveyed on the belt 7 passes the inside of the drying part 10. FIG. For this reason, the drying time of the grain in a drying process can be adjusted by controlling the conveyance speed of the conveyor belt 8. FIG.

  What is necessary is just to change the said drying time suitably with the temperature of the superheated steam to be used, or the objective of manufacture of a grain. For example, when the temperature of the superheated steam used is 160 ° C. and a general white rice coated rice is produced, the quality of the white rice can be changed by setting the drying time to an extremely short time of about 5 seconds. Only the grain surface can be treated.

  Further, if the drying time is about 30 seconds, not only the surface of the grain but also the inside is affected by superheated steam, so the moisture inside the grain is also evaporated, and this evaporation also causes the traces inside the grain. Is formed. For this reason, the whole grain is in a so-called puffed state. In the puffed grain, since the trace is formed to the inside of the grain, the trace makes it very easy to absorb water, and the water absorption ability is dramatically improved. For this reason, since it becomes possible to shorten rice cooking time compared with general white rice, the said grain can be handled as instant rice (or instant rice). If the drying time exceeds 30 seconds, the grain may turn brown.

  If you want to treat only the surface of the grain, the drying time is about 5 seconds, if you want to treat the whole grain, the drying time may be about 30 seconds. If you want to treat the grain surface with superheated steam sufficiently, but do not need to treat the whole grain, you want to perform an intermediate process between treating only the grain surface and treating the whole grain. In this case, the drying time may be set freely between 5 seconds and 30 seconds.

  When the temperature of the superheated steam to be used is 250 ° C., if the drying time by the superheated steam in the drying process is set to an extremely short time of about 4 seconds, only the grain surface is processed without changing the quality of the white rice. be able to.

  Further, if the drying time is about 20 seconds, the whole grain can be puffed, and the grain can be instantly cooked in a shorter time than when the temperature of the superheated steam used is 160 ° C. Or instant rice). If the drying time exceeds 20 seconds, the grain may turn brown.

  Note that the temperature of the superheated steam used in the drying step is not limited to 160 ° C. and 250 ° C., and may be set as appropriate in the range of 160 ° C. to 250 ° C. (preferably 180 ° C. to 250 ° C.). If the temperature is lower than 160 ° C, the irregularities and the traces may not be formed on the grain surface. If the temperature is higher than 250 ° C, the grain may be changed to brown. Moreover, the flow volume of the superheated steam injected to a grain at a drying process was 0.5 kg with respect to 1.0 kg of grain in this invention.

  After the superheated steam is sprayed for a predetermined time, the grain on the belt 7 is carried out from the drying unit 10 through the carry-out port 13b. The grain carried out from the drying unit 10 is transported to one end of the belt conveyor 8 (the side where the drive pulley 9a is located) and sent to the next coating step.

  The coating process can be performed using a generally known coating apparatus. For example, a rotary drum type coating apparatus or the like described in Patent Document 1 may be used, and the grains processed in the drying step can be coated (coated) in the same manner as ordinary raw materials. .

  In the present invention, the grain itself that coats the additive liquid is processed, so that a general additive liquid can be combined with a common coating apparatus without using a special additive liquid or a special coating apparatus. It becomes possible to produce coated grains without causing peeling of the settling and additive solution. In particular, since the grain after the drying step has excellent water absorption capability, the coated additive solution is dried to the extent that it does not bind quickly, which is effective when the amount of additive solution to be coated on the grain surface is large. .

It is the flowchart which showed the manufacturing method of the coated rice. It is a perspective view of the drying apparatus 2 used for a drying process. 3 is a side partial cross-sectional view of the drying device 2. FIG. 3 is a partial top cross-sectional view of the drying device 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flowchart 2 Drying device 3 Hopper 4 Shutter 5 Opening and closing device 6 Trough 7 Belt 8 Belt conveyor 9a Pulley
9b pulley
DESCRIPTION OF SYMBOLS 10 Drying part 11 Support stand 12 Fountain 13a Carriage
13b Unloading port 14a Shutter 14b Shutter 15a Fastening portion 15b Fastening portion 16 Supply port 17 Supply pipe 18 Blowing pipe 19 Feeder 20 Guide 21 Motor 22 Outer wall 23 Valve

Claims (3)

The raw material is grain,
A drying step of rapidly drying the surface of the grain;
A coating step of coating the surface of the grain after the drying step with an additive liquid;
Including
In the said drying process, superheated steam is made to contact a grain and the surface of this grain is dried rapidly, The manufacturing method of the coated grain characterized by the above-mentioned. 2. The coated grain according to claim 1, wherein in the drying step, the temperature of the superheated steam is 160 ° C. to 250 ° C., and the time for contacting the grain with the superheated steam is within 30 seconds. Production method. The coated grain manufactured with the manufacturing method of the coated grain of Claim 1 or 2.