JP2010119327A - Method and apparatus for producing aseptic pack boiled rice - Google Patents

Method and apparatus for producing aseptic pack boiled rice Download PDF

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JP2010119327A
JP2010119327A JP2008294962A JP2008294962A JP2010119327A JP 2010119327 A JP2010119327 A JP 2010119327A JP 2008294962 A JP2008294962 A JP 2008294962A JP 2008294962 A JP2008294962 A JP 2008294962A JP 2010119327 A JP2010119327 A JP 2010119327A
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rice
tray
immersion
sterilization
treatment
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Shigeharu Kanemoto
繁晴 金本
Tomizo Fujita
富三 藤田
Hirofumi Amano
裕文 天野
Shoji Sowa
祥二 双和
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Satake Engineering Co Ltd
Satake Corp
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Satake Engineering Co Ltd
Satake Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method (apparatus) for producing aseptic pack boiled rice, lowering the total cost of a production line, and free from degrading palate feeling and taste while giving sufficient sterilization treatment. <P>SOLUTION: This method for producing the aseptic pack boiled rice includes pressurizing and microwave irradiation heat-treating rice grains in a soaking sterilizing boiling process so as to make boiled rice which has such properties of hard outside, soft inside and hard core that a surface of rice grains is harder than an inside hardness of rice grains, and using the boiled rice to subject to retort sterilization treatment in a heating pressurizing sterilizing process as a downstream process, and giving heating action from the outside direction such as hot water soaking to the product to perform sufficient sterilization and finishing boiling. As a result of this, the boiled rice product becomes an aseptic pack boiled rice product which is not so-called sticky rice in which a boiled rice surface melts and is soft, but is firmer, has feeling of grains, and is excellent in palate feeling and taste. Furthermore, the production method lowers the total cost of a production line owing to the use of an expensive equipment for irradiation with microwaves only for the soaking sterilizing boiling process. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、電子レンジで短時間加熱することで直ちに食べることができる無菌パック米飯(加工包装米飯)を製造する方法及びその装置に関するものである。   The present invention relates to a method and an apparatus for producing aseptic packed cooked rice (processed packaged cooked rice) that can be eaten immediately by heating in a microwave oven for a short time.

近年の加工米飯においては、一人前ずつパックされた加工米飯を電子レンジで数分間加熱するか、又は熱湯中で十数分間加熱するだけで直ちに食べることができるご飯ができあがり、パックのままか又は茶碗に盛り付けて食べることができるものが登場している。これは無菌パック米飯と称される商品で、独身者や共働きの家庭などに普及してきている。   In recent processed cooked rice, cooked cooked rice is heated for a few minutes in a microwave oven, or just heated for a few dozen minutes in boiling water. There is something that can be served in a bowl. This is a product called aseptic-packed cooked rice, which has become popular among singles and double-income families.

従来、この種の無菌パック米飯の製造方法としては、例えば、本出願人による特許文献1及び2の製造方法が知られている。この特許文献1及び2の製造方法(製造ライン)は、耐熱性のある合成樹脂製のトレーに一人前(所定量)の米と浸漬水(炊飯水)の内容物を計量・充填し、前記トレー内の内容物を、加圧及びマイクロ波照射加熱処理によって前記米に吸水処理、殺菌処理及び炊飯処理を同時に行い、さらに、前記トレーの開口部を殺菌済みフィルムで蒸気逃がし孔を形成して被覆シールが行われる。次いで、この仮シールを行ったトレーに再度マイクロ波照射殺菌処理を行った後、前記トレー内の蒸らし処理がなされ、さらに、真空冷却処理、ガス置換処理及び前記通気部の密封シール処理がなされて完成品(無菌パック米飯)が製造されるものである。そして、この製造方法により、浸漬水を米内部に吸水させる浸漬時間を短時間にすることができるとともに、食味の優れた無菌パック米飯を製造することを可能にしている。   Conventionally, as a manufacturing method of this type of aseptic packed cooked rice, for example, the manufacturing methods of Patent Documents 1 and 2 by the present applicant are known. The manufacturing method (production line) of Patent Documents 1 and 2 measures and fills the contents of a serving (predetermined amount) of rice and immersion water (rice cooking water) in a heat-resistant synthetic resin tray, The contents in the tray are subjected to water absorption treatment, sterilization treatment, and rice cooking treatment at the same time by pressurization and microwave irradiation heat treatment, and further, a steam escape hole is formed in the opening of the tray with a sterilized film. A covering seal is performed. Next, after performing the microwave irradiation sterilization process again on the tray that has been temporarily sealed, the tray is steamed, and further, the vacuum cooling process, the gas replacement process, and the hermetic sealing process of the vent are performed. A finished product (sterile packed cooked rice) is manufactured. And by this manufacturing method, while being able to make the immersion time which makes immersion water absorb the water inside the rice for a short time, it is possible to manufacture aseptic packed cooked rice excellent in taste.

ところで、無菌パック米飯(加工包装米飯)は保存性を有した米飯にする必要がある。このため、十分な殺菌処理を行うべく、例えば、上記特許文献1及び2の製造方法によって得られた無菌パック米飯を、さらに、例えば特許文献3に開示されているような周知の熱水式の加圧加熱殺菌処理(いわゆるレトルト殺菌処理)をすることもあった。   By the way, aseptic packed cooked rice (processed and packaged cooked rice) needs to be cooked rice having storability. For this reason, in order to perform sufficient sterilization processing, for example, the aseptic packed cooked rice obtained by the manufacturing method of the said patent document 1 and 2 is further known, for example of the well-known hot-water type as disclosed by patent document 3 There was also a case where a pressure heat sterilization treatment (so-called retort sterilization treatment) was performed.

特開2007−295834号公報JP 2007-295834 A 特開2008−193939号公報JP 2008-193939 A 特公平3−75137Japanese Patent Publication 3-75137

ところで、上記特許文献1及び2の無菌パック米飯製造方法には以下の問題点があった。すなわち、特許文献1及び2の無菌パック米飯製造方法にあっては、前記浸漬・殺菌・炊飯工程及びマイクロ波殺菌工程において、共にマイクロ波を照射するための高額設備が必要であるため、それに伴って製造ライン全体のコストが高額になるという問題点があった。
一方、より十分な殺菌処理を無菌パック米飯に施すために、前述のように、特許文献1及び2の製造方法によって得られた無菌パック米飯に対し、さらに、前記周知の熱水式の加圧加熱殺菌処理(いわゆるレトルト殺菌処理)を施した場合(特許文献3)、殺菌性は十分であるものの、米飯の表面部が溶融して軟らかい、いわゆるベチャ飯(表面がべたついた米飯)となり、食感・食味が共に低下してしまうという問題点があった。
そこで、本発明は、上記問題点にかんがみ、製造ライン全体のコストを安価にするともに、十分な殺菌処理を施しながら食感・食味を低下させることのない無菌パック米飯製造方法を提供することを技術的課題とするものである。
By the way, the aseptic packed cooked rice manufacturing methods of Patent Documents 1 and 2 have the following problems. That is, in the aseptic packed cooked rice production method of Patent Documents 1 and 2, in the immersion, sterilization, rice cooking process and microwave sterilization process, expensive equipment for irradiating microwaves is necessary. As a result, the cost of the entire production line is high.
On the other hand, in order to perform more sufficient sterilization treatment on aseptic packed cooked rice, as described above, the well-known hot-water pressurization is further applied to the aseptic packed cooked rice obtained by the manufacturing methods of Patent Documents 1 and 2. When heat sterilization treatment (so-called retort sterilization treatment) is performed (Patent Document 3), although the bactericidal property is sufficient, the surface portion of the cooked rice is melted and soft, so-called becha rice (cooked rice with a sticky surface) There was a problem that both feeling and taste were lowered.
Therefore, in view of the above problems, the present invention provides a method for producing aseptic packed cooked rice that reduces the cost of the entire production line and does not reduce the texture and taste while performing sufficient sterilization treatment. It is a technical issue.

上記課題を解決するため、請求項1では、
所定量の米と炊飯水の内容物を投入して上方を開口した耐熱性のトレーに、浸漬、殺菌、密閉及び炊飯の各処理を施す工程を含んでなる無菌パック米飯の製造方法において、
前記トレー内の内容物を加熱蒸気によって予備加熱処理をする予備加熱工程と、
前記予備加熱処理した前記内容物にマイクロ波照射加熱及び加圧の処理により浸漬・殺菌・炊飯処理をする浸漬殺菌炊飯工程と、
前記浸漬・殺菌・炊飯処理を終えた前記トレー内に前記炊飯水を補充する補充工程と、
前記炊飯水を補充した前記トレーの上方開口部に密閉シール処理をする容器密閉シール工程と、
前記密閉シール処理した前記トレーを蒸気加熱又は熱水加熱を施して加圧殺菌処理をする加熱加圧殺菌工程と、
を順次備えてなる、という技術的手段を講じる。
In order to solve the above problem, in claim 1,
In a method for producing aseptic packed cooked rice, which includes a step of performing each treatment of immersion, sterilization, sealing, and cooking of rice in a heat-resistant tray that is opened at the top by introducing the contents of a predetermined amount of rice and cooked water,
A preheating step of preheating the contents in the tray with heated steam;
Immersion sterilization rice cooking process to immerse, sterilize, and cook rice by microwave irradiation heating and pressure treatment on the preheated content,
A replenishment step of replenishing the cooked water in the tray after the immersion, sterilization, and rice cooking treatment,
A container hermetic sealing step for hermetically sealing the upper opening of the tray supplemented with the rice cooking water;
A heat and pressure sterilization step of subjecting the tray subjected to the hermetic seal treatment to steam heating or hot water heating to perform a pressure sterilization treatment;
We will take technical measures to sequentially prepare.

請求項2により、前記予備加熱工程の加熱蒸気処理は、85℃〜95℃の加熱蒸気を、20秒〜30秒間処理する一方、前記浸漬・殺菌・炊飯処理のマイクロ波照射は、内容物の温度が135℃〜145℃になるまで行うとよい。   According to claim 2, in the heating steam treatment in the preheating step, the heating steam at 85 ° C. to 95 ° C. is treated for 20 seconds to 30 seconds, while the microwave irradiation of the immersion / sterilization / rice cooking treatment is performed on the contents. It is good to carry out until the temperature reaches 135 ° C to 145 ° C.

請求項3により、前記浸漬殺菌炊飯工程によって得られる米飯は外硬内軟芯硬の性状のものとするのがよい。   According to claim 3, the cooked rice obtained by the immersion sterilization rice cooking process should have a property of outer hard inner soft core.

請求項4により、
所定量の米と炊き水の内容物を、上方を開口した耐熱性のトレーに投入する投入部と、前記米に炊き水を浸漬する浸漬処理部、前記トレー内の内容物を殺菌する殺菌処理部、前記トレーの開口を殺菌済フィルムで密閉する密閉処理部及び前記トレー内の米を炊飯する炊飯処理部を備えてなる無菌パック米飯の製造装置において、
前記トレー内の内容物を蒸気によって予備加熱する予備加熱部と、
前記予備加熱処理した前記内容物をマイクロ波照射加熱及び加圧によって浸漬、殺菌及び炊飯を行う浸漬殺菌炊飯部と、
前記浸漬処理した前記トレーに前記炊き水を補充する補充部と、
前記炊き水を補充した前記トレーの上方開口部に密閉シールする容器密閉シール部と、
前記密閉シールした前記トレーに蒸気加熱処理又は熱水加熱処理を施しながら加圧殺菌処理をする加熱加圧殺菌部と、
を備える、という技術的手段を講じた。
According to claim 4,
An input part for charging a predetermined amount of rice and cooking water contents into a heat-resistant tray having an upper opening, an immersion treatment part for immersing cooking water in the rice, and a sterilization treatment for sterilizing the contents in the tray In a manufacturing apparatus for aseptic packed cooked rice comprising a sealing processing section for sealing the opening of the tray with a sterilized film and a rice cooking processing section for cooking rice in the tray,
A preheating unit for preheating the contents in the tray with steam;
Immersion sterilization rice cooking part to immerse, sterilize and cook rice by microwave irradiation heating and pressurizing the preheated content,
A replenishment unit for replenishing the cooking water to the immersion-treated tray;
A container hermetic seal portion for hermetically sealing the upper opening of the tray supplemented with the cooking water;
A heat and pressure sterilization unit that performs a pressure sterilization treatment while performing steam heat treatment or hot water heat treatment on the hermetically sealed tray;
Technical measures were taken to provide

請求項5により、前記予備加熱部は、85℃〜95℃の加熱蒸気を、20秒〜30秒間処理する一方、前記浸漬殺菌炊飯部は、内容物の温度が135℃〜145℃になるまでマイクロ波照射を行うとよい。   According to claim 5, the preheating unit treats heated steam of 85 ° C to 95 ° C for 20 seconds to 30 seconds, while the immersion sterilized rice cooker is until the temperature of the contents becomes 135 ° C to 145 ° C. Microwave irradiation may be performed.

本発明の無菌パック米飯の製造方法(装置)によると、浸漬殺菌炊飯工程において米粒を加圧及びマイクロ波照射加熱処理することによって米粒の表面部が米粒の内面の硬度よりも硬い、いわゆる外硬内軟芯硬の性状の米飯を得ることができるとともに、この米飯を用いて、更に下流工程の加熱加圧殺菌工程で加熱加圧殺菌処理(レトルト殺菌処理)による熱水浸漬等の外部方向からの加熱作用を与えて十分な殺菌と仕上げ炊飯をなすことによって、該製品米飯は、米飯の表面部が溶融して軟らかい、いわゆるベチャ飯(表面がべたついた米飯)にはならず、固めで粒感のある食感・食味に優れた無菌パック米飯製品にすることができ、例えば、ドライカレーやパエリアなどの調理用にも適したものとなる。
また、本発明の製造方法(製造装置)は、マイクロ波を照射する高額設備の使用が、前記浸漬殺菌炊飯工程だけでよいので、製造ライン全体のコストが安価になる。さらに、単独の浸漬工程が不要な分だけ製造ラインの設置面積を小さくできる。
According to the method (apparatus) for producing aseptic packed cooked rice of the present invention, the surface portion of the rice grain is harder than the hardness of the inner surface of the rice grain by subjecting the rice grain to pressurization and microwave irradiation heat treatment in the immersion sterilization rice cooking process, so-called outer hardness While being able to obtain cooked rice with an inner soft core hardness, from the outside direction such as hot water soaking by heat and pressure sterilization process (retort sterilization process) in the heat and pressure sterilization process of the downstream process using this cooked rice The cooked rice is sufficiently softened by melting the surface part of the cooked rice by giving it the heating action of the above, so that the surface part of the cooked rice is soft and does not become so-called becha rice (rice cooked with a sticky surface). Aseptic packaged cooked rice products with a pleasing texture and taste can be obtained, and are suitable for cooking, for example, dry curry and paella.
Moreover, since the manufacturing method (manufacturing apparatus) of the present invention only uses the expensive equipment for irradiating microwaves in the immersion sterilization rice cooking process, the cost of the entire manufacturing line is reduced. Furthermore, the installation area of the production line can be reduced by an amount that does not require a single dipping step.

以下、本発明の実施の形態について図面を参照しながら説明する。図1は、本発明の無菌パック米飯の製造装置1(製造方法)に係る概略平面図である。前記無菌パック米飯の製造装置1は、図2に示した概略図のように、トレー自動供給部2(トレー自動供給工程)を最上流側に配置し、これに続いて、異物吸引部4(異物吸引工程)、米計量充填部5(米計量充填工程)、水計量充填部6(水計量充填工程)、予備加熱部7(予備加熱工程)、浸漬殺菌炊飯部9(浸漬殺菌炊飯工程)、水計量補充部11(水計量補充工程)及び具材供給部12(具材供給工程)を順次配設し、さらに、トレー移送コンベア8等からなる搬送部、容器密閉シール部17(容器密閉シール工程)及び加熱加圧殺菌部(加熱加圧殺菌工程)23を順次配設してなる。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view relating to a sterile packed cooked rice production apparatus 1 (production method) according to the present invention. As shown in the schematic diagram of FIG. 2, the sterile packed cooked rice production apparatus 1 has the tray automatic supply unit 2 (tray automatic supply step) arranged on the most upstream side, and subsequently, the foreign matter suction unit 4 ( Foreign matter suction step), rice metering and filling unit 5 (rice metering and filling step), water metering and filling unit 6 (water metering and filling step), preheating unit 7 (preliminary heating step), immersion sterilization rice cooking unit 9 (immersion sterilization rice cooking step) , A water metering replenishment unit 11 (water metering replenishment step) and a material supply unit 12 (material supply step) are sequentially arranged, and further, a transport unit comprising a tray transfer conveyor 8 and the like, a container sealing seal unit 17 (container sealing) A sealing process) and a heat and pressure sterilization section (heat and pressure sterilization process) 23 are sequentially arranged.

トレー自動供給部2(トレー自動供給工程):
前記トレー自動供給部2は、図1及び図2に示すように、耐熱性があって合成樹脂製のトレー(容器)2cを多数積み重ねるとともに、複数列(例えば、4列)で待機させておくトレー貯留部2aと、該トレー貯留部2aの下部から各列のトレーを1枚ずつ自動で取り出すトレー供給部2bとからなり、横4列状態でトレー2cを連続的にコンベア装置3に供給するように構成してある。該コンベア装置3は、一対のスプロケット3a,3b及び補助スプロケット3c,3dにチェーン3eが巻回されており、該チェーン3eには、トレー受けパレット3f…が間隙をおいて多数取り付けられてある。前記トレー受けパレット3f…は、例えば4個のトレー2c…を1枚のトレー受けパレット3fに横4列、縦1列状態に各保持穴3g(後述)に嵌合・収容可能にしてあり、複数個のトレー2c…を整列させた状態で順次搬送する構成になっている。前記各トレー受けパレット3fには、トレー2cの下部を嵌め込むための保持穴3gが形成されており、トレー2cは、前記保持穴に嵌め込まれた状態でトレー受けパレット3fに収容されて搬送される構造になっている(図3参照)。
Tray automatic supply unit 2 (tray automatic supply process):
As shown in FIG. 1 and FIG. 2, the automatic tray supply unit 2 is stacked with a number of heat-resistant synthetic resin trays (containers) 2c and waits in a plurality of rows (for example, four rows). The tray storage unit 2a and the tray supply unit 2b that automatically picks up each tray from the bottom of the tray storage unit 2a one by one, and continuously supplies the trays 2c to the conveyor device 3 in a horizontal four-row state. It is constituted as follows. In the conveyor device 3, a chain 3e is wound around a pair of sprockets 3a and 3b and auxiliary sprockets 3c and 3d, and a number of tray receiving pallets 3f are attached to the chain 3e with a gap therebetween. In the tray receiving pallet 3f, for example, four trays 2c can be fitted and accommodated in each holding hole 3g (described later) in a state of four horizontal rows and one vertical row on one tray receiving pallet 3f. A plurality of trays 2c... Are sequentially conveyed in an aligned state. Each tray receiving pallet 3f is formed with a holding hole 3g for fitting the lower portion of the tray 2c, and the tray 2c is accommodated in the tray receiving pallet 3f in a state of being fitted in the holding hole and conveyed. (See FIG. 3).

異物吸引装置4(異物吸引工程):
前記トレー自動供給部2の次の工程には、異物吸引装置4が設けられ、トレー2c内の塵埃や異物を吸引除去できる構成になっている(図1及び図2参照)。
Foreign matter suction device 4 (foreign matter suction step):
In the next step of the tray automatic supply unit 2, a foreign matter suction device 4 is provided so that dust and foreign matter in the tray 2c can be sucked and removed (see FIGS. 1 and 2).

米計量充填部5(米計量充填工程):
前記異物吸引装置4の次の工程には、米計量充填部5が設けられる(図1参照)。該米計量充填部5は、トレー2cに所定量の例えば一人前の米(原料)の充填ができるように、高速で計量・排出可能な公知の計量機が構成してある。前記米計量充填部5は、詳細には、図2に示したように、原料である洗米された米を上部の原料ホッパ5aに投入しておき、該原料ホッパ5aの米は、中央の円錐フィーダ5bによって側部に設けられた中間ホッパ5cに供給されて所定量が貯留した後、複数の計量ホッパ5dに順次排出され、次いで前記計量ホッパ5dが、設定重量(所定量)計量した前記米を集合シュート5e、排出バルブ5f、排出ホッパ5gを経て各トレー2cにそれぞれ供給する構成にしてある。前記米計量充填部5に供給する原料は、市販されている無洗米が好ましいが、精白米、胚芽残存率の高い胚芽米、分搗き米及び玄米であってもよい。精白米、胚芽米、分搗き米など洗米が必要なものは、ホッパ5aに投入する前に別途洗米し、洗米後に、米計量充填部5に滞留しないように十分水切りをしておく必要がある。なお、投入する原料は事前に浸漬する必要はない。
Rice weighing and filling section 5 (rice weighing and filling process):
In the next step of the foreign matter suction device 4, a rice weighing and filling unit 5 is provided (see FIG. 1). The rice weighing and filling unit 5 is a known weighing machine capable of weighing and discharging at a high speed so that a predetermined amount of rice (raw material), for example, can be filled in the tray 2c. Specifically, as shown in FIG. 2, the rice weighing and filling unit 5 puts the washed rice as a raw material into the upper raw material hopper 5a, and the rice of the raw material hopper 5a has a central cone. The rice is fed to an intermediate hopper 5c provided on the side by a feeder 5b and stored in a predetermined amount, then sequentially discharged to a plurality of weighing hoppers 5d, and then the weighing hopper 5d measures a set weight (predetermined amount). Is supplied to each tray 2c through a collecting chute 5e, a discharge valve 5f, and a discharge hopper 5g. The raw material to be supplied to the rice weighing and filling unit 5 is preferably commercially available non-washed rice, but may be polished rice, germ rice having high germ survival rate, separated rice, and brown rice. For rice that needs to be washed, such as polished rice, germinated rice, and split rice, it is necessary to wash the rice separately before putting it into the hopper 5a, and then drain it sufficiently so that it does not stay in the rice weighing and filling unit 5 after washing. . It is not necessary to immerse the raw material to be introduced in advance.

水計量充填部6(水計量充填工程):
前記米計量充填部5の次の工程には、水計量充填部6を配設する(図1参照)。該水計量充填部6は、図示しない浸漬水供給部からの水をノズル6aからトレー2cに所定量だけ浸漬水として充填するよう構成したものである(図2参照)。そして、前記水計量充填部6は、前記ノズル6aから約80℃の温水の供給ができるように浸漬水を加温する装置(図示せず)が備えてある。なお、水計量充填部6においては、後述する予備加熱部7及び浸漬殺菌炊飯部9における加熱エネルギーを最小限にして加熱効率(生産効率)を向上させるために、必要最低限の浸漬水を供給するようにしてある。
Water metering and filling unit 6 (water metering and filling process):
In the next step of the rice weighing and filling unit 5, a water weighing and filling unit 6 is disposed (see FIG. 1). The water metering / filling unit 6 is configured to fill the tray 2c with a predetermined amount of water from an immersion water supply unit (not shown) as immersion water (see FIG. 2). And the said water measurement filling part 6 is equipped with the apparatus (not shown) which heats immersion water so that the hot water of about 80 degreeC can be supplied from the said nozzle 6a. In addition, in the water metering and filling unit 6, in order to improve the heating efficiency (production efficiency) by minimizing the heating energy in the preheating unit 7 and the immersion sterilization rice cooking unit 9 which will be described later, the minimum necessary immersion water is supplied. I have to do it.

予備加熱部7(予備加熱工程):
前記水計量充填部6の次の工程には、予備加熱部7を配設する(図1及び図2参照)。図3に予備加熱部7の側断面図を示す。予備加熱部7は、トレー受けパレット3fの保持穴3gに収容された各トレー2cの内容物(米と浸漬水)を予備加熱する装置によって構成する。予備加熱部7は、加熱ヒータ等で構成してもよいが、本実施例では加熱蒸気を噴出させて前記内容物に当接させる方式を用いた。この加熱蒸気式の予備加熱部7は、図3に示すように、トレー受けパレット3fに保持された各トレー2cの上方開口側に、各トレー2c内の内容物(米と浸漬水)に対して加熱蒸気を噴出する噴出ノズル7a・・・が配設されてある。また、前記各噴出ノズル7a・・・の周囲には、トレー2cの上方開口を覆う形状でなる内側覆部材7b・・・を配設する。さらに、前記各内側覆部材7b・・・の上方側の周囲には、これら内側覆部材7b・・・の全てを覆う外側覆部材7cを配設する。そして、これら噴出ノズル7a・・・、内側覆部材7b・・・及び外側覆部材7cは、前記トレー受けパレット3fが本工程に搬送されたタイミングで、都度、駆動手段7dによって、一体的に上下動するように構成してある。
Preheating unit 7 (preheating step):
In the next step of the water metering and filling unit 6, a preheating unit 7 is disposed (see FIGS. 1 and 2). FIG. 3 shows a side sectional view of the preheating unit 7. The preheating part 7 is comprised by the apparatus which preheats the content (rice and immersion water) of each tray 2c accommodated in the holding hole 3g of the tray receiving pallet 3f. The preheating unit 7 may be constituted by a heater or the like, but in the present embodiment, a system in which heated steam is jetted and brought into contact with the contents is used. As shown in FIG. 3, the heating steam type preheating unit 7 is disposed on the upper opening side of each tray 2 c held on the tray receiving pallet 3 f with respect to the contents (rice and immersion water) in each tray 2 c. Are arranged to eject heated steam. In addition, inner cover members 7b... Having a shape covering the upper opening of the tray 2c are disposed around each of the ejection nozzles 7a. Further, an outer cover member 7c that covers all of the inner cover members 7b... Is disposed around the upper side of each of the inner cover members 7b. The jet nozzles 7a,..., And the outer cover member 7c are integrally moved up and down by the drive means 7d each time the tray receiving pallet 3f is conveyed to the main process. It is configured to move.

前記予備加熱部7は、前記各トレー2cに加熱蒸気を噴出する際には、図3(a)に示したように、前記駆動手段7dによって、噴出ノズル7a・・・、内側覆部材7b・・・及び外側覆部材7cを一体的に降下させて、各内側覆部材7b・・・は各トレー2cの上方開口部に接近して覆った状態に、また、前記外側覆部材7cは、全てのトレー2cの外周を覆って密閉状態となるように、当該外側覆部材7cの周縁部7eをトレー受けパレット3fの上面に当接できる状態に構成してある。また、前記各内側覆部材7b・・・における開口部には、前記噴出ノズル7a・・・から噴出された加熱蒸気が前記トレー2c内の内容物により均一に供給されるように、蒸気噴風均一化板7fによって閉塞状に構成してある。該蒸気噴風均一化板7fは、図3(b)に示したように、トレー2cの上方開口部よりも大きい板状部材とし、その中央部分には、前記噴出蒸気が通過できる程度の大きさの多数の蒸気孔7g・・・が配設してある。そして、該蒸気孔7g・・・は、前記トレー2cの上方開口部の面積と同じ面積をとなるくらいの数を密集配設し、かつ、これら蒸気孔蒸気孔7g・・・の群の輪郭形状が前記トレー2cの上方開口部の外縁形状と同じ形状となるように配設するのがよい。   As shown in FIG. 3 (a), the preheating unit 7 ejects heated steam to the trays 2c by means of the drive means 7d by means of the ejection nozzles 7a,. .. and the outer cover member 7c are integrally lowered so that each inner cover member 7b... Is covered close to the upper opening of each tray 2c, and all the outer cover members 7c are The outer periphery 7e of the outer cover member 7c is configured to be in contact with the upper surface of the tray receiving pallet 3f so that the outer periphery of the tray 2c is covered and sealed. Further, steam blasts are provided so that heated steam ejected from the ejection nozzles 7a... Is uniformly supplied to the openings in the inner cover members 7b. It is configured to be closed by a uniformizing plate 7f. As shown in FIG. 3 (b), the steam blast uniformizing plate 7f is a plate-like member that is larger than the upper opening of the tray 2c, and is large enough to allow the ejected steam to pass therethrough. A large number of vapor holes 7g are arranged. The steam holes 7g... Are densely arranged so as to have the same area as the upper opening of the tray 2c, and the outline of the group of these steam holes steam holes 7g. It is preferable that the shape is the same as the shape of the outer edge of the upper opening of the tray 2c.

浸漬殺菌炊飯部9(浸漬殺菌炊飯工程):
前記予備加熱部7の次の工程には、浸漬殺菌炊飯部9を配設する(図1及び図2参照)。前記浸漬殺菌炊飯部9は、トレー2c内の米に浸漬水を浸漬させる浸漬作用、滅菌を行う滅菌作用及び炊飯作用の3つの作用を同時に行う工程設備である。図4に、前記浸漬殺菌炊飯部9の概略断面図が示してある。前記浸漬殺菌炊飯部9は、まず、油圧シリンダー30の昇降動作により、支柱32によって昇降するベース板31を有する。該ベース板31の上面には複数の支持体34・・・を立設し、該支持体34・・・の各先端側は、上下に分割構成された一対の上チャンバー38及び下チャンバー35における、該下チャンバー35の底面側を支持している。前記上チャンバー38と下チャンバー35の接離面(当接面)には、上下をそれぞれ凹状に形成してなる密封空間となるチャンバー40を複数構成し、本実施例においては、搬送されてきた四つのトレー2cをそれぞれ収納可能なように四つを並設した構成にした。前記各チャンバー40は、上方に配設されたマイクロ波発振装置36からのマイクロ波照射を受けることができるように、マイクロ波発振装置36から延設された導波管37が前記上チャンバー38を貫通して連通された構成になっている。
Dipping sterilization rice cooking part 9 (immersion sterilization rice cooking process):
In the next step of the preheating unit 7, an immersion sterilization rice cooking unit 9 is disposed (see FIGS. 1 and 2). The said immersion sterilization rice cooking part 9 is process equipment which performs three actions simultaneously, the immersion action which immerses immersion water in the rice in the tray 2c, the sterilization action which performs sterilization, and the rice cooking action. In FIG. 4, the schematic sectional drawing of the said immersion sterilization rice cooking part 9 is shown. First, the immersion sterilization rice cooker 9 has a base plate 31 that is moved up and down by a support column 32 by moving up and down the hydraulic cylinder 30. A plurality of supports 34 are erected on the upper surface of the base plate 31, and each tip side of the supports 34... Is in a pair of upper chamber 38 and lower chamber 35 that are divided vertically. The bottom chamber side of the lower chamber 35 is supported. On the contact / separation surface (contact surface) of the upper chamber 38 and the lower chamber 35, a plurality of chambers 40 serving as sealed spaces formed by forming a concave shape on the upper and lower sides are formed, and have been transported in this embodiment. Four trays 2c are arranged side by side so as to be accommodated. Each of the chambers 40 is provided with a waveguide 37 extending from the microwave oscillation device 36 so as to receive microwave irradiation from the microwave oscillation device 36 disposed above. It is the structure which penetrated and communicated.

前記下チャンバー35は、図4に示すように、該下チャンバー35側におけるチャンバー40の下半割部(前記凹状)上に、トレー受けパレット3fの保持穴に嵌合させたトレー2cが搬送されてきた時点で該パレット3fを挟み込むように上方に押し上げられるようになっており、これにより、各パレット3f(保持穴に嵌合されたトレー2c)が、上チャンバー38側の上半割部(前記凹状)との接合によって形成されるチャンバー40内に密閉状態に保持されるように構成してある。本実施例におけるチャンバー40の配置構成は、前記各パレット3fに並設した4個のトレー受けパレット3f(保持穴に嵌合されたトレー2c)に合わせて4個とした。   As shown in FIG. 4, in the lower chamber 35, the tray 2c fitted in the holding hole of the tray receiving pallet 3f is conveyed on the lower half portion (the concave shape) of the chamber 40 on the lower chamber 35 side. At this point, the pallet 3f is pushed upward so as to sandwich the pallet 3f. As a result, each pallet 3f (the tray 2c fitted in the holding hole) is moved to the upper half of the upper chamber 38 side ( It is configured to be held in a sealed state in the chamber 40 formed by joining with the concave shape. The arrangement configuration of the chambers 40 in this embodiment is four in accordance with the four tray receiving pallets 3f (the trays 2c fitted in the holding holes) arranged in parallel with the pallets 3f.

本実施例(図4)においては、一つのチャンバー40に対しては、二つのマイクロ波発振装置36から3kWの出力のマイクロ波がそれぞれ照射される構造としてある。また、マイクロ波発振装置36の出力は3kWに限定されるものではなく、無菌パック米飯の製造条件により適切な出力に変更すればよい。なお、隣接するマイクロ波発信装置から照射するマイクロ波の周波数を変えるようにすることで、マイクロ波が干渉することを防止することができる。   In the present embodiment (FIG. 4), one chamber 40 is configured to be irradiated with microwaves having an output of 3 kW from two microwave oscillators 36, respectively. Further, the output of the microwave oscillation device 36 is not limited to 3 kW, and may be changed to an appropriate output depending on the production conditions of aseptic packed cooked rice. In addition, it can prevent that a microwave interferes by changing the frequency of the microwave irradiated from an adjacent microwave transmitter.

前記各チャンバー40は、内部を加圧可能にするため、図示していないエアーコンプレッサと上チャンバー38を貫通したチャンバー40内との間を圧縮空気送給管42を介して連通してある。該圧縮空気送給管42の配管途中には減圧弁43、電磁弁44及び圧力計45が設けてある。前記上チャンバー38と下チャンバー35の接離面の周縁部にはパッキン41が配設してあり、密閉状のチャンバー40内から圧縮空気が漏れるのを防ぎ、チャンバー40の気密性が維持されるようにしてある。   Each chamber 40 communicates between an air compressor (not shown) and the inside of the chamber 40 penetrating the upper chamber 38 via a compressed air supply pipe 42 so that the inside can be pressurized. A decompression valve 43, a solenoid valve 44, and a pressure gauge 45 are provided in the middle of the compressed air supply pipe 42. A packing 41 is disposed at the peripheral edge of the contact and separation surfaces of the upper chamber 38 and the lower chamber 35 to prevent leakage of compressed air from the sealed chamber 40 and maintain the airtightness of the chamber 40. It is like that.

一方、前記各チャンバー40内の加圧空気を抜いて降圧するために、圧縮空気排気管46が前記下チャンバー35を貫通して各チャンバー40内部と連通している。前記圧縮空気排気管46の配管途中には、電磁弁47、スピードコントローラ48及び電磁弁49が配設されており、これら電磁弁47、スピードコントローラ48及び電磁弁49を制御することによりチャンバー40内の圧力を所定の速度で降圧できるようにしてあえる。また、下チャンバー35は油圧シリンダー30の昇降運動により上下方向に動くため、前記圧縮空気排気管46はフレキシブルなものを用いるとよい。   On the other hand, a compressed air exhaust pipe 46 passes through the lower chamber 35 and communicates with the interior of each chamber 40 in order to remove the pressurized air from each chamber 40 and lower the pressure. An electromagnetic valve 47, a speed controller 48, and an electromagnetic valve 49 are arranged in the middle of the compressed air exhaust pipe 46. By controlling these electromagnetic valve 47, speed controller 48, and electromagnetic valve 49, the inside of the chamber 40 is provided. The pressure can be reduced at a predetermined speed. Further, since the lower chamber 35 moves up and down by the lifting and lowering movement of the hydraulic cylinder 30, the compressed air exhaust pipe 46 may be flexible.

水計量補充部11(水計量補充工程):
前記浸漬殺菌炊飯部9の次の工程には、水計量補充部11を配設する(図1及び図2参照)。該水計量補充部11は、各トレー2cに仕上げ炊飯用及び炊飯調整用(米飯の硬さ調整用)の炊飯水を補充するために、炊飯水タンクから所定量の補充炊飯水をノズル11aからトレー2cに供給可能に構成してある。なお、水計量補充部11は、前記水計量充填部6と同様に、前記ノズル11aから約80℃の温水の供給できるように図示しない水の加温装置が備えてある。
Water meter replenishment unit 11 (water meter replenishment step):
In the next step of the immersion sterilization rice cooker 9, a water metering replenishment unit 11 is disposed (see FIGS. 1 and 2). The water metering replenishment unit 11 supplies a predetermined amount of supplemented rice cooking water from the rice cooking water tank from the nozzle 11a in order to supplement each tray 2c with rice cooking water for finishing rice cooking and rice cooking adjustment (for adjusting the hardness of cooked rice). The tray 2c can be supplied. The water metering replenishment unit 11 is provided with a water heating device (not shown) so that hot water of about 80 ° C. can be supplied from the nozzle 11a, similarly to the water metering and filling unit 6.

具材供給部12(具材供給工程)
前記水計量補充部11の次の工程には、具材供給部12を配設する(図1及び図2参照)。該具材供給部12は、図2に示すように、各トレー2c内に各種具材を計量供給するために、具材タンク12aから任意量の具材が計量供給可能に構成してある。
Ingredient supply unit 12 (Ingredient supply process)
In the next step of the water metering replenishment unit 11, an ingredient supply unit 12 is disposed (see FIGS. 1 and 2). As shown in FIG. 2, the material supply unit 12 is configured to measure and supply an arbitrary amount of material from the material tank 12a in order to measure and supply various materials into each tray 2c.

なお、具材供給部12のトレー2c排出側とこの後工程となる容器密閉シール部17との間には、トレー移送コンベア8、横送りコンベア13及び押し込み手段29が配設され、具材供給部12から排出された各トレー2c(仮製品)が容器密閉シール部17に移送されるようにしてある。前記押し込み手段29は、移送されてきたトレー2cを容器密閉シール部17に押し出し供給するためのものである(図1及び図5参照)。   In addition, the tray transfer conveyor 8, the lateral feed conveyor 13, and the pushing means 29 are disposed between the tray 2c discharge side of the material supply unit 12 and the container hermetic seal unit 17 as a subsequent process, and the material supply Each tray 2c (provisional product) discharged from the section 12 is transferred to the container hermetic seal section 17. The pushing means 29 is for pushing and feeding the transferred tray 2c to the container hermetic seal portion 17 (see FIGS. 1 and 5).

容器密閉シール部17(容器密閉シール工程)
前記具材供給部12の次の工程には、容器密閉シール部17を配設する(図1及び図5参照)。該容器密閉シール部17は、各チャンバー40内において、トレー2cに対してガス置換して上方開口部を密閉シール処理するものである。容器密閉シール部17は、コンベア装置18を備え、該コンベア装置18の上流側から、仮製品供給部15、仮製品整列部16、放射温度計19、チャンバー24、ローレットシール部21及び容器フランジ冷却部22を順次配設する。前記コンベア装置18は、一対のスプロケット18a,18bにチェーン18cが巻回されており、該チェーン18cには、トレー受けパレット18d…が間隙をおいて多数取り付けられている。前記各トレー受けパレット18d…には、トレー2cを四つ横4列、縦1列状態に並設するための保持穴(図示せず)が四つ並設されている。
Container sealing seal 17 (container sealing process)
In the next step of the ingredient supply unit 12, a container sealing seal unit 17 is disposed (see FIGS. 1 and 5). The container hermetic seal portion 17 is configured to hermetically seal the upper opening by replacing the gas in the tray 2 c in each chamber 40. The container sealing seal unit 17 includes a conveyor device 18, and from the upstream side of the conveyor device 18, the temporary product supply unit 15, the temporary product alignment unit 16, the radiation thermometer 19, the chamber 24, the knurled seal unit 21, and the container flange cooling. The parts 22 are sequentially arranged. In the conveyor device 18, a chain 18c is wound around a pair of sprockets 18a and 18b, and a large number of tray receiving pallets 18d are attached to the chain 18c with a gap therebetween. Each of the tray receiving pallets 18d is provided with four holding holes (not shown) for arranging the trays 2c in four horizontal four rows and one vertical row.

前記仮製品供給部15は、前記具材供給部12を経て搬送されてきた、内部に浸漬処理済み米、炊飯水及び具材が入ったトレー2c(仮製品)を順次後工程に供給可能な構成になっている。前記仮製品整列部16は、前記仮製品供給部15から供給されたトレー2cを前記トレー受けパレット18d・・・の各保持穴に供給して四つを並設状態に整列させるように構成してある   The temporary product supply unit 15 can sequentially supply the tray 2c (temporary product) that has been transported through the material supply unit 12 and contains the soaked rice, cooked water, and ingredients to the subsequent process. It is configured. The temporary product alignment unit 16 is configured to supply the tray 2c supplied from the temporary product supply unit 15 to each holding hole of the tray receiving pallet 18d. Have

また、前記放射温度計19については、トレー2c内の温度を検知するように構成してある。前記チャンバー24については、前記トレー2cを供給して密閉空間にした当該チャンバー24内を真空状態下のチャンバー24内に窒素ガスや炭酸ガスを充満させてガス置換するとともに、トレー2cの上方開口部を密閉シール包装できるように構成してある。前記ローレットシール部21は、密閉シール包装されたトレー2cのシール面の捲れ防止のために、当該トレー2cのシール面の周縁部をローレットシールするためのものである。さらに、前記容器フランジ冷却部22は、ローレットシールした前記トレー2cのシール面の周縁部を冷却するためのものである。   The radiation thermometer 19 is configured to detect the temperature in the tray 2c. As for the chamber 24, the inside of the chamber 24, which is supplied with the tray 2c to be a sealed space, is replaced with a gas by filling the chamber 24 under vacuum with nitrogen gas or carbon dioxide gas, and an upper opening of the tray 2c. Can be hermetically sealed. The knurled seal portion 21 is for knurling the peripheral portion of the seal surface of the tray 2c in order to prevent the seal surface of the tray 2c packaged in a hermetically sealed manner from curling. Further, the container flange cooling part 22 is for cooling the peripheral part of the sealing surface of the tray 2c which has been knurled.

なお、上記製造フローにおいては、各トレー2cは内部に米と浸漬水(炊飯水)が入って上方が開放状態となる区間があり、このままの状態では雑菌などの異物が混入するおそれがあるので、例えば、前記予備加熱部7(予備加熱工程)、浸漬殺菌炊飯部9(浸漬殺菌炊飯工程)、水計量補充部11(水計量補充工程)及び具材供給部12(具材供給工程)、トレー移送コンベア8及び容器密閉シール部17(容器密閉シール工程)を、雑菌などの異物混入を防止するためにクリーンブース10内に配設するのがよい。   In the above manufacturing flow, each tray 2c has a section in which rice and immersion water (rice cooking water) enter and the upper part is open, and foreign substances such as germs may be mixed in this state. For example, the preheating unit 7 (preheating process), the immersion sterilization rice cooking unit 9 (immersion sterilization rice cooking process), the water metering replenishment unit 11 (water metering replenishment step) and the material supply unit 12 (material supply step), The tray transfer conveyor 8 and the container sealing seal part 17 (container sealing sealing process) are preferably arranged in the clean booth 10 in order to prevent contamination by foreign substances such as bacteria.

加熱加圧殺菌部23(加熱加圧殺菌工程<レトルト殺菌>)
前記容器密閉シール部17の次の工程には、加熱加圧殺菌部23を配設する(図1及び図6参照)。該加熱加圧殺菌部23は、前工程で上方開口部が密閉シールされたトレー2cを加熱加圧殺菌部23に入れて殺菌処理する工程である。該加熱加圧殺菌部23は公知の装置(レトルト殺菌装置)を用いる。例えば、(株)日阪製作所製の高温高圧調理殺菌装置(商品名:フレーバーエース)を用いるとよい。前記加熱加圧殺菌部23は、図6に示すように、開閉扉23aを有し室内を密閉状態にできる処理槽23bを備える。そして、該処理槽23bには、加圧空気を密閉室内に供給する加圧空気供給管23cが接続されるほか、密閉室内の加圧空気を排気する排気管23d、温水タンク23gから密閉室内に熱水を供給する熱水供給管23e及び密閉室内で使用後の熱水を排出する配水管23fがそれぞれ接続されたものとなっている。該処理槽23bで殺菌処理をする場合には、複数の前記トレー2cを並べた整列皿を多段にしてこれを処理槽23bに入れた後、後述する加熱加圧条件で制御運転する。上記は熱水中にトレー2cを浸漬する熱水加熱式のものであるが、このほか、加熱蒸気を室内に充満せて加熱させる蒸気加熱式のものを使用してもよい。
Heat and pressure sterilization section 23 (heat and pressure sterilization process <retort sterilization>)
In the next step of the container hermetic seal portion 17, a heat and pressure sterilization portion 23 is provided (see FIGS. 1 and 6). The heat and pressure sterilization unit 23 is a step in which the tray 2c whose upper opening is hermetically sealed in the previous step is placed in the heat and pressure sterilization unit 23 and sterilized. The heat and pressure sterilization unit 23 uses a known device (retort sterilization device). For example, a high-temperature and high-pressure cooking sterilizer (trade name: Flavor Ace) manufactured by Nisaka Manufacturing Co., Ltd. may be used. As shown in FIG. 6, the heat and pressure sterilization unit 23 includes a treatment tank 23 b having an open / close door 23 a and capable of sealing the inside of the room. The treatment tank 23b is connected to a pressurized air supply pipe 23c for supplying pressurized air into the sealed chamber, and is connected to the sealed chamber from an exhaust pipe 23d for exhausting the pressurized air in the sealed chamber and the hot water tank 23g. A hot water supply pipe 23e for supplying hot water and a water distribution pipe 23f for discharging hot water after use in a sealed room are connected to each other. When performing the sterilization treatment in the treatment tank 23b, after arranging the plurality of trays 2c arranged in multiple stages into the treatment tank 23b, the control operation is performed under the heating and pressurizing condition described later. Although the above is a hot water heating type in which the tray 2c is immersed in hot water, a steam heating type in which heating steam is filled in the room and heated may be used.

作用:
以下、上記無菌パック米飯の製造装置1を用いた本発明の無菌パック米飯の製造方法について説明する。図1及び図2に示すように、トレー自動供給部2から減菌されたトレー2cが、コンベア装置3における前記取り出されてトレー受けパレット3f…の保持穴に供給され、四つのトレー2cは、横一列に整列されて順次搬送される。四つの前記トレー2cは、次いで、異物吸引装置4によりトレー2c内の塵埃や異物が吸引除去された後、米計量充填部5に搬送される。なお、この工程の前後において紫外線によるトレー2cの殺菌を行ってもよい。
Action:
Hereinafter, the manufacturing method of the aseptic packed cooked rice of this invention using the said manufacturing apparatus 1 of aseptic packed cooked rice is demonstrated. As shown in FIGS. 1 and 2, the tray 2c sterilized from the tray automatic supply unit 2 is taken out and supplied to the holding hole of the tray receiving pallet 3f in the conveyor device 3, and the four trays 2c are It is aligned in a horizontal row and conveyed sequentially. The four trays 2c are then transported to the rice weighing and filling unit 5 after the foreign matter suction device 4 sucks and removes dust and foreign matters in the tray 2c. Note that the tray 2c may be sterilized with ultraviolet rays before and after this step.

米計量充填部5においては、80グラム〜100グラムの米の供給容量のトレー2c内にあらかじめ殺菌された所定量の米(無洗米)が順次計量・充填される(図1及び図2参照)。本実施例では約87gの米を充填した。次いで、水計量充填部6において、あらかじめ殺菌された約80℃の浸漬水(温水)が各トレー2cの中に順次計量・充填される。本実施例では約120g(cc)の前記浸漬水を充填した。   In the rice weighing and filling unit 5, a predetermined amount of rice (washless rice) sterilized in advance in the tray 2c having a rice supply capacity of 80 to 100 grams is sequentially weighed and filled (see FIGS. 1 and 2). . In this example, about 87 g of rice was filled. Next, in the water metering and filling section 6, about 80 ° C. immersion water (warm water) sterilized in advance is sequentially weighed and filled in each tray 2c. In this example, about 120 g (cc) of the immersion water was filled.

予備加熱工程:
前工程で浸漬水が充填されたトレー2cは、次に前記予備加熱部7に搬送される(図1、図2及び図3参照)。各トレー2cは、図3に示すように、前記予備加熱部7において、前記噴出ノズル7a、内側覆部材7b及び外側覆部材7cの一体的な降下により、各噴出ノズル7a及び内側覆部材7bが各トレー2cの上方開口部近傍にセットされるとともに、前記外側覆部材7cの周縁部7eとトレー受けパレット3fの上面との当接によって密閉空間内に配置される。この状態で、前記各噴出ノズル7a・・・からトレー2c内の内容物(米と浸漬水)に対して、温度85℃〜95℃の加熱蒸気を20秒間〜30秒間噴出・当接し、内容物(米と浸漬水)を予備加熱する。このとき、前記内側覆部材7bには前記蒸気噴風均一化板7fを構成してあるので、トレー2c内の内容物全体は、均等に加熱蒸気が当接されてムラのない予備加熱がなされる。また、各トレー2cは前記外側覆部材7cによる密閉空間内で蒸気当接を受けるので、蒸気が外に漏れず予備加熱の効率がよい。
Preheating process:
The tray 2c filled with the immersion water in the previous step is then transported to the preheating unit 7 (see FIGS. 1, 2 and 3). As shown in FIG. 3, each tray 2 c has a structure in which each of the ejection nozzles 7 a and the inner cover member 7 b is moved by the integrated lowering of the ejection nozzle 7 a, the inner cover member 7 b and the outer cover member 7 c in the preheating unit 7. It is set in the vicinity of the upper opening of each tray 2c, and is disposed in the sealed space by contact between the peripheral edge 7e of the outer cover member 7c and the upper surface of the tray receiving pallet 3f. In this state, heated steam at a temperature of 85 ° C. to 95 ° C. is jetted and brought into contact with the contents (rice and immersion water) in the tray 2c from each of the jet nozzles 7a. Preheat items (rice and soaking water). At this time, since the steam blast uniformizing plate 7f is formed on the inner covering member 7b, the entire contents in the tray 2c are evenly contacted with the heating steam and preheated without unevenness. The Moreover, since each tray 2c receives steam contact in the sealed space by the outer covering member 7c, steam does not leak to the outside, and the efficiency of preheating is good.

浸漬殺菌炊飯工程:
前工程で予備加熱されたトレー2cは、次に前記浸漬殺菌炊飯部9に搬送される(図1、図2、図4及び図7参照)。この浸漬殺菌炊飯部9では、極めて短時間のうちに、トレー2c内に充填された無洗米に、前記浸漬水(炊飯水)を吸水させる浸漬処理、前記無洗米を殺菌(滅菌)する殺菌処理及び前記無洗米を炊飯する炊飯処理がなされるように、図7のグラフに示したようなマイクロ波の照射条件及び加圧条件の制御がなされる。図7に示したマイクロ波の照射条件及び加圧条件の制御について説明する。図7は、横軸に時間(秒)、縦軸にチャンバー40内の温度(℃)をとったグラフであり、浸漬殺菌炊飯部9において各トレー2c内の無洗米及び浸漬水を加熱する条件を示しており、チャンバー40内の温度と同じ時間軸で、マイクロ波のon/off制御の状態及びチャンバー40内の圧力の状態も示している。
Immersion sterilization rice cooking process:
The tray 2c preliminarily heated in the previous step is then conveyed to the immersion sterilization rice cooker 9 (see FIGS. 1, 2, 4, and 7). In the soaking sterilization rice cooking unit 9, in a very short time, the soaking rice filled in the tray 2c is soaked in the soaking water (cooking water), and the soaking rice is sterilized (sterilized). And the irradiation conditions and pressurization conditions of a microwave as shown in the graph of FIG. 7 are controlled so that the rice cooking process which cooks the said non-washing rice is made. Control of microwave irradiation conditions and pressurization conditions shown in FIG. 7 will be described. FIG. 7 is a graph with time (seconds) on the horizontal axis and temperature (° C.) in the chamber 40 on the vertical axis, and conditions for heating the unwashed rice and the immersion water in each tray 2 c in the immersion sterilization rice cooker 9. The state of the on / off control of the microwave and the state of the pressure in the chamber 40 are also shown on the same time axis as the temperature in the chamber 40.

前記浸漬殺菌炊飯部9に送られてきた各トレー2cは、下チャンバー35を押し上げることで上チャンバー38に当接して形成されるチャンバー40内に収容される。チャンバー40が形成されると、減圧弁43により調整された圧縮空気を、電磁弁44を開いて送管42を介してチャンバー40内に送り、チャンバー40内を加圧する。   Each tray 2c sent to the immersion sterilization rice cooker 9 is accommodated in a chamber 40 formed by abutting the upper chamber 38 by pushing up the lower chamber 35. When the chamber 40 is formed, the compressed air adjusted by the pressure reducing valve 43 is opened into the chamber 40 through the feed pipe 42 by opening the electromagnetic valve 44, and the inside of the chamber 40 is pressurized.

浸漬処理:
図7のグラフを参照しながら説明する。チャンバー40内の圧力が3.0〜4.0kg/cmの値(好ましくは3.4〜3.8kg/cmの値)、より好ましくは約3.6kg/cmに加圧された時点で、マイクロ波発振装置36によるマイクロ波の照射を開始する。照射されたマイクロ波は各トレー2c内の無洗米及び浸漬水に照射され、これにより、トレー2c内の浸漬水が100℃を超える温度範囲102℃〜110℃(より好ましくは105℃程度)まで加熱される。このとき、チャンバー40内は、同時に、加圧されているため、浸漬水を100℃を超える温度まで加熱することが可能である。また、トレー2c内の浸漬水の温度が所定の温度になった時点で、2秒間〜10秒間(好ましくは2秒〜5秒間)、より好ましくは3秒間、前記温度を維持させることにより、トレー2c内の無洗米はムラなく均一に加熱され、十分な吸水(浸漬処理)がなされる。このように、予備加熱を終えて浸漬殺菌炊飯部9に供給されたトレー2c内の無洗米及び浸漬水が更に上記のように加熱・加圧される時間が浸漬処理の時間となる。
Immersion treatment:
This will be described with reference to the graph of FIG. Pressure 3.0~4.0kg / cm 2 in value in the chamber 40 (preferably a value of 3.4~3.8kg / cm 2), more preferably pressurized to about 3.6 kg / cm 2 At that time, microwave irradiation by the microwave oscillator 36 is started. Irradiated microwaves are irradiated to the unwashed rice and the immersion water in each tray 2c, whereby the immersion water in the tray 2c exceeds the temperature range of 102 ° C to 110 ° C (more preferably about 105 ° C). Heated. At this time, since the inside of the chamber 40 is pressurized at the same time, the immersion water can be heated to a temperature exceeding 100 ° C. Further, when the temperature of the immersion water in the tray 2c reaches a predetermined temperature, the temperature is maintained for 2 seconds to 10 seconds (preferably 2 seconds to 5 seconds), more preferably 3 seconds. The unwashed rice in 2c is heated uniformly without unevenness, and sufficient water absorption (immersion treatment) is performed. In this way, the time during which the non-washed rice and the immersion water in the tray 2c supplied to the immersion sterilization rice cooker 9 after preheating is further heated and pressurized as described above is the time for the immersion treatment.

本実施例(図7)では、チャンバー40内の圧力を制御することでチャンバー内の温度を調節している。具体的には、チャンバー40内の温度が所定の温度に達する直前に、チャンバー40内の圧力の減圧を開始し、浸漬処理が終わるまで一定の割合で3.0kg/cmまで減圧するようにスピードコントローラ48を制御する。この減圧時には、電磁弁44及び電磁弁49は閉じたままにする。このように、前記減圧により所定の温度の状態を所定の時間維持することができる。なお、本発明は、浸漬殺菌炊飯部9での加熱において、所定の温度の状態を所定の時間維持する加熱を浸漬処理(工程)としている。また、照射するマイクロ波の出力を制御することでも、所定の温度の状態を2秒〜10秒間維持させることは可能である。 In this embodiment (FIG. 7), the temperature in the chamber is adjusted by controlling the pressure in the chamber 40. Specifically, immediately before the temperature in the chamber 40 reaches a predetermined temperature, pressure reduction in the chamber 40 is started, and the pressure is reduced to 3.0 kg / cm 2 at a constant rate until the dipping process is completed. The speed controller 48 is controlled. During this decompression, the solenoid valve 44 and the solenoid valve 49 are kept closed. Thus, the predetermined temperature state can be maintained for a predetermined time by the pressure reduction. In addition, in this invention, the heating which maintains the state of predetermined temperature for the predetermined time in the heating in the immersion sterilization rice cooking part 9 is made into the immersion process (process). Further, it is possible to maintain a predetermined temperature state for 2 seconds to 10 seconds by controlling the output of the microwave to be irradiated.

前記浸漬処理では、マイクロ波の照射を停止することなく、チャンバー40内の圧力を減圧させることで浸漬水の温度上昇を抑えるので、既に沸騰している前記浸漬水の気化がより活発になり無洗米への吸水が促進される。また、トレー2c内に投入する無洗米に、胴割れ米が混入している場合でも、マイクロ波の照射作用により、胴割れ米に生じている割れ目付近の澱粉がアルファ化して結着し、前記割れ目をふさぐように作用するため、この米は炊飯した際に割れ飯になることが防止され、米飯の外観的・食感的な品質が向上する。   In the immersion treatment, since the temperature rise of the immersion water is suppressed by reducing the pressure in the chamber 40 without stopping the microwave irradiation, vaporization of the already-immersed immersion water becomes more active. Water absorption into washed rice is promoted. In addition, even when the shell cracked rice is mixed in the wash-free rice put into the tray 2c, the starch near the crack generated in the shell cracked rice is alpha-blended and bound by the irradiation effect of the microwave, Since it acts so as to close the cracks, this rice is prevented from becoming cracked rice when cooked, and the appearance and texture of rice is improved.

(殺菌処理<減菌処理>:)
上記の浸漬処理の後、チャンバー内の圧力を再度3.6kg/cmまで加圧して、トレー2c内の浸漬水の温度を140℃まで加熱し、この温度を2秒〜10秒間(好ましくは2秒〜5秒間)、より好ましくは3秒間維持させる(図7参照)。本実施例では、トレー2c内の浸漬水の温度が140℃に達する直前にマイクロ波の照射を停止し、マイクロ波の照射を停止した時点で、チャンバー40内の圧力をスピードコントローラ48の制御により減圧させ始めることで、前記140℃の温度を所定の時間維持するようにしている。このように温度を所定の時間維持させる別の方法としては、照射するマイクロ波の出力を制御するようにしてもよい。本発明では、浸漬殺菌炊飯部9での加熱において、前記浸漬処理後、更に温度上昇して温度140℃の状態を所定の時間維持するまでの加熱時間が殺菌処理の時間となる。
(Sterilization treatment <Sterilization treatment> :)
After the above immersion treatment, the pressure in the chamber is again increased to 3.6 kg / cm 2 , the temperature of the immersion water in the tray 2c is heated to 140 ° C., and this temperature is set for 2 seconds to 10 seconds (preferably 2 seconds to 5 seconds), more preferably 3 seconds (see FIG. 7). In this embodiment, the microwave irradiation is stopped immediately before the temperature of the immersion water in the tray 2c reaches 140 ° C., and when the microwave irradiation is stopped, the pressure in the chamber 40 is controlled by the speed controller 48. By starting to depressurize, the temperature of 140 ° C. is maintained for a predetermined time. As another method for maintaining the temperature for a predetermined time as described above, the output of the microwave to be irradiated may be controlled. In the present invention, in the heating in the immersion sterilization rice cooker 9, after the immersion treatment, the heating time until the temperature is further increased and the temperature of 140 ° C. is maintained for a predetermined time is the time for the sterilization treatment.

(炊飯処理:)
上記の殺菌処理の後、スピードコントローラ48の制御によって、徐々にチャンバー40内の圧力を下げて、チャンバー40内の浸漬水の温度を低下させ、該温度が110℃〜105℃、好ましくは約108℃まで低下した時点で、マイクロ波を照射して、この温度を3秒〜10秒間(好ましくは3秒〜7秒間)、より好ましくは5秒間維持させ、殺菌処理後のこれまでの加熱時間が炊飯処理の時間となる(図7参照)。この炊飯処理を終えてなる米飯のアルファ化度は約98%で、水分は約36%程度である。
(Cooking rice processing :)
After the above sterilization treatment, the pressure in the chamber 40 is gradually lowered by the control of the speed controller 48 to lower the temperature of the immersion water in the chamber 40. The temperature is 110 ° C. to 105 ° C., preferably about 108 ° C. When the temperature is lowered to 0 ° C., microwave irradiation is performed, and this temperature is maintained for 3 seconds to 10 seconds (preferably 3 seconds to 7 seconds), more preferably 5 seconds. It is time for the rice cooking process (see FIG. 7). The degree of alpha conversion of the cooked rice after the cooking process is about 98%, and the moisture is about 36%.

上記炊飯処理を終えてなる米飯は、前述のように浸漬殺菌炊飯工程(浸漬殺菌炊飯部9)において、トレー2c内の無洗米(無浸漬原料米)と炊飯水とが加圧状態でマイクロ波照射加熱による前記浸漬処理、殺菌処理及び炊飯処理が順次なされ、米粒の内外部及び炊飯水の全てが同時に全体的に均一にムラなく加熱されて得られる。また、同時に、前記浸漬処理、殺菌処理及び炊飯処理においてなされた減圧作用によって、米粒内の中間部にポーラス状で微細ないわゆる水の通り道(水路)が形成され、該水路内にチャンバー内の残圧作用によって浸漬水が吸収・保持される。このため、得られる前記米飯は、米粒の表面部の水分が該米粒の中心部よりも高く、表面部と中心部の間の中間部よりも低い状態となり(高水分側:中間部>表面部>中心部:低水分側)、米飯性状が、米粒の表面部及び中心部が硬く、表面及び中心部の間の中間部が軟らかい、いわゆる外硬内軟芯硬の三層状態のものとなる(表面部:硬質、中間部:軟質、中心部:硬質)。なお、ここでいう「硬質」とは、前記中間部に比べて硬いのであって、決して炊飯が不十分であるというわけではない。   As described above, the cooked rice after the above-mentioned rice cooking treatment is microwaved with the non-washed rice (non-immersed raw rice) and the cooked water in the tray 2c being pressurized in the immersion sterilization rice cooking process (immersion sterilization rice cooking unit 9). The immersion treatment, sterilization treatment, and rice cooking treatment by irradiation heating are sequentially performed, and all the inside and outside of the rice grains and the rice cooking water are simultaneously and uniformly heated as a whole. At the same time, a porous and fine so-called water passage (water channel) is formed in the middle part of the rice grain by the decompression action performed in the immersion treatment, sterilization treatment, and rice cooking treatment, and the remaining in the chamber in the water channel. The immersion water is absorbed and retained by the pressure action. For this reason, the obtained cooked rice is in a state in which the moisture of the surface part of the rice grain is higher than the center part of the rice grain and lower than the intermediate part between the surface part and the center part (high moisture side: intermediate part> surface part) > Center part: low moisture side), the rice properties are in the three-layer state of the so-called outer hard inner soft core hard, the surface part and the central part of the rice grain are hard, the middle part between the surface and the central part is soft (Surface portion: hard, middle portion: soft, center portion: hard). In addition, "hard" here is hard compared with the said intermediate part, Comprising: Rice cooking is not necessarily inadequate.

(処理後の排出:)
上記の炊飯処理が終了すると、トレー2c内の浸漬水の温度をさらに下げるため、マイクロ波の照射を停止し、最終的には100℃付近まで低下させてから、浸漬殺菌炊飯部9からトレー2cを取り出し、該トレー2cを次工程の水計量補充部11に搬送する。なお、トレー2cを浸漬殺菌炊飯部9から取り出すためには、チャンバー40内の圧力を大気圧と同じレベルまで減圧させる必要があるので、前記炊飯処理の終了後、数秒が経過してから電磁弁49を開き、チャンバー40内を確実に大気圧と同レベルまで減圧するとよい。
(Discharge after treatment :)
When the above rice cooking process is finished, in order to further lower the temperature of the immersion water in the tray 2c, the microwave irradiation is stopped, and finally the temperature is lowered to around 100 ° C., and then the immersion sterilization rice cooking unit 9 to the tray 2c. And transport the tray 2c to the water metering replenishment section 11 in the next step. In addition, in order to take out tray 2c from the immersion sterilization rice cooking part 9, since it is necessary to depressurize the pressure in the chamber 40 to the same level as atmospheric pressure, it is a solenoid valve after several seconds have passed after the end of the rice cooking process. 49 is opened, and the inside of the chamber 40 may be surely decompressed to the same level as the atmospheric pressure.

前記浸漬殺菌炊飯部9から取り出したトレー2c内の浸漬水は、この時点で、一部は米に吸水され、残りは気化しているため、ほぼなくなっている。   The immersion water in the tray 2c taken out from the immersion sterilization rice cooker 9 is almost lost at this point because part of the immersion water is absorbed by the rice and the rest is vaporized.

前記浸漬殺菌炊飯部9から取り出したトレー2c内の米飯は、この時点で、水分が30%〜50%(好ましくは35%〜40%)になっている。アルファ化度は、約98%になっている。   The cooked rice in the tray 2c taken out from the immersion sterilized rice cooker 9 has a water content of 30% to 50% (preferably 35% to 40%) at this point. The alpha degree is about 98%.

前記浸漬殺菌炊飯部9から排出されたトレー2cは、図1に示すように、コンベア装置3によって次工程の水計量補充部11に送られる。該水計量補充部11では、あらかじめ殺菌された仕上げ炊飯用(炊飯調整用)の約80℃の炊飯水が順次計量・補充される。本実施例では約80g(cc)の前記炊飯水を充填した。該炊飯水が充填されたトレー2cは、前記具材供給部12に搬送され、任意の具材が順次計量・供給される。なお、白ご飯の商品を製造する際は、トレー2cに具材を供給せず前記具材供給部12は通過させる。   As shown in FIG. 1, the tray 2 c discharged from the immersion sterilization rice cooker 9 is sent to the water metering replenishment unit 11 of the next process by the conveyor device 3. In the water metering and replenishing unit 11, cooked rice at about 80 ° C. for finishing rice cooking (for rice cooking adjustment) sterilized in advance is sequentially weighed and supplemented. In this example, about 80 g (cc) of the rice cooking water was filled. The tray 2c filled with the cooked rice water is transported to the ingredient supply unit 12, and arbitrary ingredients are sequentially weighed and supplied. In addition, when manufacturing the product of white rice, the said ingredient supply part 12 is allowed to pass through without supplying ingredients to the tray 2c.

前工程で具材が供給されたトレー2cは、次に、前記トレー移送コンベア8、横送りコンベア13、押し込み手段29、前記製品供給装置15及び製品整列装置16からなる搬送部を経て放射温度計19に送られ、次いで、前記容器密閉シール部17に搬送される(図1参照)。前記放射温度計19においては、米飯の温度が検知されて製品の温度管理が行われ、この後、前記密封包装部17に搬入される。   The tray 2c to which the ingredients have been supplied in the previous process is then subjected to a radiation thermometer via a transport unit comprising the tray transfer conveyor 8, the lateral feed conveyor 13, the pushing means 29, the product supply device 15 and the product alignment device 16. 19 and then conveyed to the container hermetic seal 17 (see FIG. 1). In the radiation thermometer 19, the temperature of the cooked rice is detected and the temperature of the product is controlled, and thereafter, it is carried into the sealed packaging portion 17.

容器密閉シール工程:
前記密封包装部17では、トレー2cを真空冷却・ガス置換・密封シールを行う(図1及び図5)。前記トレー2cが密封包装部17のチャンバー24内に搬入されると、まず、チャンバー24の真空発生装置(図示せず)を作動してチャンバー24内を真空状態下まで減圧し、トレー2c内の米飯を75℃まで急冷させる。これにより、雑菌の繁殖を抑えるとともに、ガス置換の効率を高めることができる。前記減圧時には、トレー2c内の空気も吸い出される。次いで、真空状態下のチャンバー24内に窒素ガスや炭酸ガスを充満させてガス置換が行われる。
Container sealing process:
In the sealed packaging part 17, the tray 2c is subjected to vacuum cooling, gas replacement, and hermetically sealing (FIGS. 1 and 5). When the tray 2c is carried into the chamber 24 of the sealed packaging portion 17, first, a vacuum generator (not shown) of the chamber 24 is operated to depressurize the chamber 24 to a vacuum state, Quickly cool the cooked rice to 75 ° C. As a result, it is possible to suppress the propagation of germs and increase the efficiency of gas replacement. During the decompression, the air in the tray 2c is also sucked out. Next, gas replacement is performed by filling the chamber 24 under vacuum with nitrogen gas or carbon dioxide gas.

ガス置換後のトレー2cは、チャンバー24内で、図示しない線シール手段によりフランジの全周がシールされ、ローレットシール部21にコンベア18により搬送される。ローレットシール部21では、捲れ防止のローレットシールをトレー2cに施し、次いで、容器フランジ冷却部22により冷却してトレー2cの完全な密封シールが完了する。   The tray 2c after gas replacement is sealed in the chamber 24 by a line sealing means (not shown) and is conveyed to the knurled seal portion 21 by the conveyor 18. In the knurled seal portion 21, a knurled seal that prevents sag is applied to the tray 2 c and then cooled by the container flange cooling portion 22 to complete the complete sealing of the tray 2 c.

加熱加圧殺菌工程(レトルト殺菌):
前記密封包装部17から順次排出された完全密封シール済みのトレー2cは、図1及び図6に示したように、例えば、作業員やロボット等によって整列皿上に複数個並べられる一方、この整列皿は、多段状(例えば8段)に重ねる。次いで、この8段状の整列皿(複数のトレー2c)を1ロットとして、前記加熱加圧殺菌部23(レトルト殺菌装置)の処理槽23b内に、開閉扉23aを開けて例えば3ロット(合計24段)分の複数のトレー2cを供給セットし、開閉扉23aを閉めて処理槽23b内を密閉状態にする(図6参照)。次いで、前記処理槽23b内に加圧空気を供給するとともに熱水を供給し、処理槽23b内の温度を例えば115℃まで上昇させて35分間この状態を保持して加熱加圧殺菌処理を施す。これにより、完全密封シールされたトレー2c内の米飯は、完全に殺菌処理されるとともに、前記米飯の芯部等の仕上げ炊飯処理がなされ完全アルファ化(アルファ化度100%)したものとなる(水分は60%〜65%程度)。
Heat and pressure sterilization process (retort sterilization):
As shown in FIG. 1 and FIG. 6, a plurality of trays 2c that are sequentially discharged from the sealed packaging portion 17 are arranged on an alignment plate by an operator, a robot, or the like. The dishes are stacked in a multistage shape (for example, 8 stages). Next, the eight-stage alignment dish (a plurality of trays 2c) is taken as one lot, and the open / close door 23a is opened in the treatment tank 23b of the heat and pressure sterilization unit 23 (retort sterilizer), for example, 3 lots (total) A plurality of trays 2c for 24 steps) are supplied and set, the door 23a is closed, and the inside of the processing tank 23b is sealed (see FIG. 6). Next, pressurized air is supplied into the processing tank 23b and hot water is supplied, and the temperature in the processing tank 23b is raised to, for example, 115 ° C., and this state is maintained for 35 minutes to perform a heat and pressure sterilization process. . As a result, the cooked rice in the tray 2c that has been completely hermetically sealed is completely sterilized, and is subjected to a finishing rice cooking process such as the core of the cooked rice to be completely alphalated (degree of alpha 100%) ( The moisture is about 60% to 65%).

本発明の特徴的作用:
本発明の特徴的な作用効果は、上記加熱加圧殺菌工程(加熱加圧殺菌部23<レトルト殺菌装置>)を終えて完成した無菌パック米飯の性状に表れる。すなわち、本発明の無菌パック米飯は、上記加熱加圧殺菌処理(レトルト殺菌処理)を施しても、米飯がいわゆるベチャ飯(表面がべたついた米飯)にならず、粒感があり、固めで食感のあるものとなる点にある。これは、前述のように、前記浸漬殺菌炊飯工程(浸漬殺菌炊飯部9)で浸漬殺菌炊飯処理によって得られた米飯の性状が外硬内軟芯硬であるためであり、この外硬内軟芯硬の米飯は、最終工程の前記加熱加圧殺菌工程(<レトルト殺菌処理>)において、トレー2c内の米飯が熱水浸漬や加熱蒸気当接等による外部方向からの加熱作用を受けても、米粒の表面部が米粒内面の硬度よりも硬い状態にあるため、米粒の表面部が溶融されないからである。
Characteristic actions of the present invention:
The characteristic effect of this invention appears in the property of the aseptic packed cooked rice which completed the said heat-pressure sterilization process (The heat-pressure sterilization part 23 <retort sterilizer>). That is, the aseptic packed cooked rice of the present invention does not become so-called becha rice (cooked rice with a sticky surface) even if the above-mentioned heat and pressure sterilization treatment (retort sterilization treatment) is performed, and it has a grainy texture and is hard to eat. It is in the point which becomes a feeling. This is because, as described above, the properties of the cooked rice obtained by the immersion sterilization rice cooking process in the immersion sterilization rice cooking step (immersion sterilization rice cooking unit 9) is an outer hard inner soft core, and this outer hard inner soft Even if the cooked rice in the tray 2c is subjected to a heating action from the outside by hot water immersion or heated steam contact in the heat and pressure sterilization step (<retort sterilization treatment>) in the final step. This is because the surface part of the rice grain is not melted because the surface part of the rice grain is harder than the hardness of the inner surface of the rice grain.

また、本発明によって製造された無菌パック米飯は、上記加熱加圧殺菌処理(レトルト殺菌処理)を施しているので、殺菌効果が十分なものとなる。さらに、本発明の製造フロー(製造設備)は、マイクロ波を照射する高額設備の使用が、前記浸漬殺菌炊飯工程(浸漬殺菌炊飯部9)だけでよいので、製造ライン全体のコストも安価になる。また、単独の浸漬工程が不要な分だけ製造ライン全体の設置面積を小さくできる効果もある。   Moreover, since the aseptic packed rice produced according to the present invention has been subjected to the heat and pressure sterilization treatment (retort sterilization treatment), the sterilization effect is sufficient. Furthermore, the manufacturing flow (manufacturing equipment) of the present invention requires only the above-mentioned immersion sterilization rice cooking process (immersion sterilization rice cooking unit 9) to use the expensive equipment for irradiating microwaves, so the cost of the entire production line is also low. . Moreover, there is an effect that the installation area of the entire production line can be reduced by an amount that does not require a single dipping step.

本発明の菌パック米飯の製造装置に係る概略平面図を示す。The schematic plan view which concerns on the manufacturing apparatus of the fungi-packed cooked rice of this invention is shown. 同製造装置におけるトレー自動供給部、異物吸引装置、米計量充填部、水計量充填部、予備加熱部、浸漬殺菌炊飯部、水計量補充部、具材供給部の各構成及び製造設備フローを示す側面図である。The configuration of the automatic tray supply unit, foreign matter suction device, rice metering and filling unit, water metering and filling unit, preheating unit, immersion sterilization rice cooking unit, water metering replenishing unit and ingredient supply unit in the same manufacturing apparatus and the flow of manufacturing equipment are shown. It is a side view. 同予備加熱部の構成を示し多縦断面図(図1のA−A断面図)である。It is a multi-longitudinal sectional view (AA sectional view of FIG. 1) showing the configuration of the preheating unit. 同浸漬殺菌炊飯部の構成を示した縦断面図(図1のB−B断面図)である。It is the longitudinal cross-sectional view (BB sectional drawing of FIG. 1) which showed the structure of the immersion sterilization rice cooking part. 同容器密閉シール部の構成を示した側面図である。It is the side view which showed the structure of the container hermetic seal part. 同加熱加圧殺菌部の構成を示した側断面図である。It is the sectional side view which showed the structure of the same heat pressurization sterilization part. 同浸漬殺菌炊飯部における加圧条件、マイクロ波照射条件及びトレー内温度の関係を示した加熱条件の制御グラフである。It is a control graph of the heating conditions which showed the relationship between the pressurization conditions in the immersion sterilization rice cooking part, the microwave irradiation conditions, and the temperature in a tray.

符号の説明Explanation of symbols

1 無菌パック米飯の製造装置
2 トレー自動供給部
2a トレー貯留部
2b トレー供給部
2c トレー(容器)
3 コンベア装置
3a スプロケット
3b スプロケット
3c 補助スプロケット
3d 補助スプロケット
3e チェーン
3f トレー受けパレット
3g 保持穴
3e チェーン
4 異物吸引装置
5 米計量充填部
5a 原料ホッパ
5b 円錐フィーダ
5c 中間ホッパ
5d 中間ホッパ
5e 集合シュート
5f 排出バルブ
6 水計量充填部
6a ノズル
7 予備加熱部
7a ノズル
7b 内側覆部材
7c 外側覆部材
7d 駆動手段
7e 周縁部
7f 蒸気噴風均一化板
7g 蒸気孔
8 トレー移送コンベア
9 浸漬殺菌炊飯部
10 クリーンブース
11 水計量補充部
11a ノズル
12 具材供給部
12a 具材タンク
13 横送りコンベア
15 仮製品供給部
16 仮製品整列部
17 容器密閉シール部
18 コンベア装置
18a スプロケット
18b スプロケット
18c チェーン
18d パレット
19 放射温度計
21 ローレトシール部
22 容器フランジ冷却部
23 加熱加圧殺菌部
23a 開閉扉
23b 処理槽
23c 加圧空気供給管
23d 排気管
23e 熱水供給管
23f 排水管
23g 温水タンク
24 チャンバー
29 押し込み手段
30 油圧シリンダー
31 ベース板
32 支柱
34 支持体
35 下チャンバー
36 マイクロ波発振装置
37 導波管
38 上チャンバー
40 チャンバー
41 パッキン
42 圧縮空気送給管
43 減圧弁
44 電磁弁
45 圧力計
46 圧縮空気排気管
47 電磁弁
48 スピードコントローラ
49 電磁弁
DESCRIPTION OF SYMBOLS 1 Aseptic packed cooked rice manufacturing apparatus 2 Tray automatic supply part 2a Tray storage part 2b Tray supply part 2c Tray (container)
3 Conveyor device 3a Sprocket 3b Sprocket 3c Auxiliary sprocket 3d Auxiliary sprocket 3e Chain 3f Tray receiving pallet 3g Holding hole 3e Chain 4 Foreign material suction device 5 Rice weighing and filling unit 5a Raw material hopper 5b Conical feeder 5c Intermediate hopper 5d Intermediate hopper 5e Collecting chute 5f Discharge Valve 6 Water metering and filling section 6a Nozzle 7 Preheating section 7a Nozzle 7b Inner covering member 7c Outer covering member 7d Driving means 7e Peripheral section 7f Steam blast uniformizing plate 7g Steam hole 8 Tray transfer conveyor 9 Dip sterilization rice cooking section 10 Clean booth DESCRIPTION OF SYMBOLS 11 Water metering replenishment part 11a Nozzle 12 Material supply part 12a Material tank 13 Horizontal feed conveyor 15 Temporary product supply part 16 Temporary product alignment part 17 Container sealing seal part 18 Conveyor apparatus 18a Sprocket 18b Sprocket 18c Chain 18d Pallet 19 Radiation thermometer 21 Low-let seal part 22 Container flange cooling part 23 Heating and pressurizing sterilization part 23a Opening and closing door 23b Treatment tank 23c Pressurized air supply pipe 23d Exhaust pipe 23e Hot water supply pipe 23f Drain pipe 23g Hot water tank 24 Chamber 29 Pushing means 30 Hydraulic cylinder 31 Base plate 32 Support column 34 Support 35 Lower chamber 36 Microwave oscillator 37 Waveguide 38 Upper chamber 40 Chamber 41 Packing 42 Compressed air supply pipe 43 Pressure reducing valve 44 Electromagnetic valve 45 Pressure gauge 46 Compressed air exhaust pipe 47 Solenoid valve 48 Speed controller 49 Solenoid valve

Claims (5)

所定量の米と炊飯水の内容物を投入して上方を開口した耐熱性のトレーに、浸漬、殺菌、密閉及び炊飯の各処理を施す工程を含んでなる無菌パック米飯の製造方法において、
前記トレー内の内容物を加熱蒸気によって予備加熱処理をする予備加熱工程と、
前記予備加熱処理した前記内容物にマイクロ波照射加熱及び加圧の処理により浸漬・殺菌・炊飯処理をする浸漬殺菌炊飯工程と、
前記浸漬・殺菌・炊飯処理を終えた前記トレー内に前記炊飯水を補充する補充工程と、
前記炊飯水を補充した前記トレーの上方開口部に密閉シール処理をする容器密閉シール工程と、
前記密閉シール処理した前記トレーを蒸気加熱又は熱水加熱を施して加圧殺菌処理をする加熱加圧殺菌工程と、
を順次備えてなることを特徴とする無菌パック米飯の製造方法。
In a method for producing aseptic packed cooked rice, which includes a step of performing each treatment of immersion, sterilization, sealing, and cooking of rice in a heat-resistant tray that is opened at the top by introducing the contents of a predetermined amount of rice and cooked water,
A preheating step of preheating the contents in the tray with heated steam;
Immersion sterilization rice cooking process to immerse, sterilize, and cook rice by microwave irradiation heating and pressure treatment on the preheated content,
A replenishment step of replenishing the cooked water in the tray after the immersion, sterilization, and rice cooking treatment,
A container hermetic sealing step for hermetically sealing the upper opening of the tray supplemented with the rice cooking water;
A heat and pressure sterilization step of subjecting the tray subjected to the hermetic seal treatment to steam heating or hot water heating to perform a pressure sterilization treatment;
A method for producing aseptic packed cooked rice, comprising:
前記予備加熱工程の加熱蒸気処理は、85℃〜95℃の加熱蒸気を、20秒〜30秒間処理する一方、前記浸漬・殺菌・炊飯処理のマイクロ波照射は、内容物の温度が135℃〜145℃になるまで行う請求項1に記載の無菌パック米飯の製造方法。   The heating steam treatment in the preliminary heating process is performed by treating the steam at 85 ° C. to 95 ° C. for 20 seconds to 30 seconds, while the microwave irradiation of the immersion / sterilization / rice cooking treatment is performed at a temperature of the content of 135 ° C. The method for producing aseptic packed cooked rice according to claim 1, which is performed until the temperature reaches 145 ° C. 前記浸漬殺菌炊飯工程によって得られる米飯が外硬内軟芯硬の性状のものとする請求項1又は請求項2に記載の無菌パック米飯の製造方法。   The method for producing aseptic packed cooked rice according to claim 1 or 2, wherein the cooked rice obtained by the immersion sterilized rice cooking step has a property of an outer hard inner soft core. 所定量の米と炊き水の内容物を、上方を開口した耐熱性のトレーに投入する投入部と、前記米に炊き水を浸漬する浸漬処理部、前記トレー内の内容物を殺菌する殺菌処理部、前記トレーの開口を殺菌済フィルムで密閉する密閉処理部及び前記トレー内の米を炊飯する炊飯処理部を備えてなる無菌パック米飯の製造装置において、
前記トレー内の内容物を蒸気によって予備加熱する予備加熱部と、
前記予備加熱処理した前記内容物をマイクロ波照射加熱及び加圧によって浸漬、殺菌及び炊飯を行う浸漬殺菌炊飯部と、
前記浸漬処理した前記トレーに前記炊き水を補充する補充部と、
前記炊き水を補充した前記トレーの上方開口部に密閉シールする容器密閉シール部と、
前記密閉シールした前記トレーに蒸気加熱処理又は熱水加熱処理を施しながら加圧殺菌処理をする加熱加圧殺菌部と、
を備えることを特徴とする無菌パック米飯の製造装置。
An input part for charging a predetermined amount of rice and cooking water contents into a heat-resistant tray having an upper opening, an immersion treatment part for immersing cooking water in the rice, and a sterilization treatment for sterilizing the contents in the tray In a manufacturing apparatus for aseptic packed cooked rice comprising a sealing processing section for sealing the opening of the tray with a sterilized film and a rice cooking processing section for cooking rice in the tray,
A preheating unit for preheating the contents in the tray with steam;
Immersion sterilization rice cooking part to immerse, sterilize and cook rice by microwave irradiation heating and pressurizing the preheated content,
A replenishment unit for replenishing the cooking water to the immersion-treated tray;
A container hermetic seal portion for hermetically sealing the upper opening of the tray supplemented with the cooking water;
A heat and pressure sterilization unit that performs a pressure sterilization treatment while performing steam heat treatment or hot water heat treatment on the hermetically sealed tray;
An aseptic packed cooked rice production apparatus comprising:
前記予備加熱部は、85℃〜95℃の加熱蒸気を、20秒〜30秒間処理する一方、前記浸漬殺菌炊飯部は、内容物の温度が135℃〜145℃になるまでマイクロ波照射を行う請求項4に記載の無菌パック米飯の製造装置。   The preheating unit treats heated steam at 85 ° C. to 95 ° C. for 20 seconds to 30 seconds, while the immersion sterilized rice cooking unit performs microwave irradiation until the temperature of the contents reaches 135 ° C. to 145 ° C. The aseptic packaged rice production apparatus according to claim 4.
JP2008294962A 2008-11-18 2008-11-18 Method and apparatus for producing aseptic pack boiled rice Pending JP2010119327A (en)

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