JP2009207457A - Method for producing sweet roasted chestnut by utilizing superheated steam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing sweet roasted chestnuts by which the high-quality sweet roasted chestnuts can be continuously roasted without requiring skill of roasting technique by utilizing superheated steam in a roasting step of the sweet roasted chestnuts instead of the roasting of the roasted sweet chestnuts by a conventional batch-type roasting pan. <P>SOLUTION: Provided is a method for efficiently producing the high-quality sweet roasted chestnut which comprises using a conveyor-type superheated steam roasting machine for a step of roasting the sweet roasted chestnuts and setting the temperature and the treating time of the superheated steam so as to match to the size and the kind of the chestnuts. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a method for producing baked sweet chestnuts.

The baked sweet chestnut is manufactured along the process shown in FIG. 1, for example. That is, the raw chestnut as a raw material is first washed with running water (cleaning process). Next, after the non-standard raw material is sorted and removed (screening process), it is baked in a kettle with the heated stone (baking process). After baking for a certain time, take out from the kettle and coat the surface of chestnut with vegetable oil (oil coating) to give it a gloss. Finally, by cooling to room temperature (cooling process), the baked sweet potato products are manufactured. The grilled sweet chestnut produced in the above process is marketed after packaging with a paper or plastic packaging material (packaging process).

When grilled sweet chestnuts are sold after being baked in a 10 kg scale kettle at a retail store, etc., in consideration of the variety and size of the raw chestnuts, the baked sweet chestnuts are manufactured by adjusting the firing conditions as needed. It is possible. However, when industrially firing in a 100 kg scale kettle, a kettle that can automatically adjust the chestnut baking level has been developed, but requires high skill in firing. In addition, in order to mix and bake the small stones and chestnuts that were heated during the chestnut firing, we added a starch syrup and added viscosity to mix well. Adhering to the chestnut surface, the quality deteriorates. In addition to this situation, sales of baked sweet chestnuts are concentrated from autumn to winter, so food manufacturers that produce and sell large quantities need to manufacture day and night continuously.

Superheated steam is industrially used for various applications such as sterilization drying of food, waste treatment, heat treatment of wood, etc. Recently, the use of superheated steam for food processing utilizing its characteristics is progressing. Superheated steam is characterized by a large amount of heat compared to heated air and a good quality of the processed food since it is close to an oxygen-free state. For this reason, it has begun to be used in various fields such as processing processed marine products such as scallops and salmon, manufacturing instant noodles, roasting coffee beans, manufacturing chicken and vegetable extracts, and sterilizing spices. However, a production method utilizing superheated steam for baking sweet potatoes has not been reported.
Japanese Patent Application Laid-Open No. 2005-269979 JP 2005-137269 A JP 2004-041170 A JP 2001-086958 A Japanese Patent Laid-Open No. 08-242807 Journal of Japan Society for Food Science and Technology, Volume 53, p373-379 (2006) The food industry July 30 issue, p20-63 (2005) Journal of Japan Society for Food Science and Technology, Volume 51, p167-171 (2004)

In view of such circumstances, the present invention provides a method for efficiently producing a baked sweet chestnut with a certain quality by using superheated steam for baking the baked sweet chestnut without requiring skill.

By using superheated steam in the baking process of grilled sweet chestnut, the temperature of the superheated steam and the processing time can be easily increased without using pebbles heated in a conventional batch-type baking pot. Bake quality baked sweet chestnuts.

The present invention can produce high-quality baked sweet chestnuts without requiring skill by using superheated steam in the baking step of baked sweet chestnuts. Furthermore, by using a conveyor-type superheated steam baking machine, the baked sweet chestnut can be continuously baked with higher efficiency than a batch-type baking pot, and the manufacturing cost can be reduced.

The production method using superheated steam according to the present invention is performed, for example, along the steps shown in FIG. That is, the raw chestnut as a raw material is first washed with running water (cleaning process). Next, after removing the non-standard raw material (screening process), the raw material is put into a continuous superheated steam baking machine and fired (continuous baking process). Chestnuts that have passed through a continuous superheated steam baking machine for a certain period of time are coated with vegetable oil thinly on the chestnut surface (oil coating) to give gloss. Finally, by cooling to room temperature (cooling process), the baked sweet potato products are manufactured. The manufactured baked sweet chestnut is marketed after packaging with a paper or plastic packaging material (packaging process). The temperature of the superheated steam in the continuous firing step is preferably set to 150 to 200 ° C. and the firing time is set to a range of 20 to 40 minutes.

The baked sweet chestnut thus obtained is stable in baking, and since the candy is not used in the baking process, the carbonized candy does not adhere to the surface of the baked sweet chestnut, and is a high quality baked sweet chestnut.

After washing 1 kg of Chinese chestnut of regular size (about 7g / piece) with running water, put it into a batch-type superheated steam baking machine (super steam oven vertical type, manufactured by Denso Corporation) and heat it with 180 ° C superheated steam. Treated for minutes. After baking, the chestnut surface was thinly coated with vegetable oil to give it a gloss, and then cooled with a fan. Chestnuts baked with superheated steam had a sugar content of 22% and a moisture content of 48%, and showed almost the same values as baked sweet chestnuts baked by the conventional method. Moreover, the chestnut after baking was finished in a state where the outer demon skin was dry and the inner thin skin was easy to peel. On the other hand, the color of chestnut pulp gave a beautiful yellow color compared to chestnuts baked by the conventional method.

After washing 20 kg of Chinese chestnuts of regular size (about 7 g / piece) with running water, spread it on the belt conveyor on the entrance side of a continuous superheated steam baking machine (super steam oven conveyor type, manufactured by Denso Corporation). It was set to pass through the treatment tank filled with 180 ° C. superheated steam for 25 minutes. After baking, the surface of the chestnut was coated with vegetable oil thinly with a vegetable oil to give it luster and cooled with a fan. As a result of measuring the sugar content and water content of the baked sweet chestnut treated with the superheated steam treatment, the sugar content was 24% and the water content was 47%, which was almost the same value as the baked sweet chestnut baked by the conventional method. Moreover, the chestnut after baking was finished in a state where the outer demon skin was dry and the inner thin skin was easy to peel. On the other hand, the color of chestnut pulp gave a beautiful yellow color compared to chestnuts baked by the conventional method.

By using superheated steam in the baking process of baked sweet chestnut, it is possible to easily produce high quality baking by setting the temperature and processing time of superheated steam without using pebbles heated in a conventional batch-type baking pot. It is possible to produce sweet chestnuts. Furthermore, since sweet potatoes can be baked in large quantities continuously from autumn to winter, when demand is concentrated, the time and cost can be reduced, so that it can be provided at an appropriate price.

It is a flow sheet which shows the procedure of grilled sweet chestnut manufacture. It is a flow sheet which shows the procedure of baked sweet chestnut manufacture with a continuous superheated steam baking machine.

Claims (3)

A method for producing baked sweet chestnuts, characterized in that superheated steam is used in a baking process for baked sweet potatoes. A method for producing baked sweet chestnuts, characterized in that a continuous superheated steam baking machine is used for the baking step of baked sweet chestnuts. The method for producing baked sweet chestnuts according to claim 1 or 2, wherein superheated steam is used for baking baked sweet chestnuts to produce baked sweet chestnuts with stable quality by a simple method.

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