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Food drying method

A food drying and drying technology, which is applied in food preservation, drying solid materials, drying gas arrangement, etc., can solve the problems of difficult food shrinkage and deformation, complex change dynamics, and difficult to achieve precise control, so as to improve the appearance of products performance, reduced shrinkage deformation, and easy handling

Active Publication Date: 2021-06-25
INST OF AGRO FOOD SCI & TECH CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the hot air drying process, the moisture migration rate is affected by factors such as the main ingredients of the food, the heat transfer coefficient, and the humidity of the drying medium. The dynamics of the change are very complicated. The purpose of controlling the shrinkage and deformation of food

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Step 1), measure the first moisture content of the noodles to be dried to be 17%;

[0056] Step 2), the second water content of the measured noodles is 18%, and the second water activity at 30-40°C is 83%;

[0057] Step 3), the third water content of the noodles is 14%, and the third water activity of the noodles at 30-40° C. is measured to be 60%;

[0058] Step 4), the first water content of the noodles to be dried is less than the second water content, directly carry out secondary drying;

[0059] Measure the second time, the second distance=second delivery speed×second time×1.5, determine the distance from the start point to the end point of the second drying interval according to the second distance; the second water activity is 83%, then the second drying interval Dry air is passed into the starting point to the third relative humidity of 68%, the allowable fluctuation range is 63-73%, and the third water activity is 60%, then the dry air is passed into the end po...

Embodiment 2

[0064] Step 1), measure the first moisture content of the noodles to be dried to be 34%;

[0065] Step 2), the second water content of the measured noodles is 18%, and the second water activity at 30-40°C is 83%;

[0066] Step 3), the third water content of the noodles is 14%, and the third water activity of the noodles at 30-40° C. is measured to be 60%;

[0067] Step 4), the first moisture content of the noodles to be dried is greater than the second moisture content, and the food to be dried is sequentially subjected to primary drying and secondary drying;

[0068] Measure the first time and the second time, calculate the first distance and the second distance, the first distance=the first conveying speed×the first time, the second distance=the second conveying speed×the second time×1.5; according to the first distance Determine the distance from the start point to the end point of the first drying interval; determine the distance from the start point to the end point of t...

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Abstract

The invention discloses a food drying method, which comprises the following steps of putting food to be dried into a drying section, conveying the food from the starting point of the drying section to the end point to complete drying, and respectively determining the relative humidity of a drying medium at the starting point of the drying section and the relative humidity of a drying medium at the end point of the drying section according to the water activity of the food to be dried in different states at the preset drying temperature, wherein the temperature in the drying section is consistent with the preset drying temperature. According to the food drying method provided by the invention, the purpose of controlling the moisture migration rate is achieved by controlling the difference value between the relative humidity of the drying medium in the drying section and the moisture activity of the food to be dried, and then shrinkage deformation of the food is effectively reduced; and the method is simple and easy to operate, can be applied to industrialized production, and is beneficial to effectively improving the appearance marketability of food and the acceptability of consumers.

Description

technical field [0001] The invention relates to the technical field of food processing. More specifically, the present invention relates to a food drying method. Background technique [0002] Food drying is the process of water migration from food to the environment, reducing the moisture content of food and prolonging the shelf life of food. Food shrinkage and deformation will occur after drying, and the degree of food shrinkage and deformation will affect the appearance of food and consumer acceptance. The degree of food shrinkage deformation is affected by the moisture migration rate during the drying process. Therefore, how to control the moisture migration rate during the drying process is the key to controlling food shrinkage deformation. [0003] Hot air drying is the most commonly used drying technology, which adjusts the moisture migration rate by controlling the temperature of the drying medium. During the hot air drying process, the moisture migration rate is a...

Claims

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Application Information

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IPC IPC(8): F26B3/02F26B21/08F26B25/22A23L3/40
CPCF26B3/02F26B21/08F26B25/22A23L3/40
Inventor 张波张影全李明孙倩倩巨明月郭波莉
Owner INST OF AGRO FOOD SCI & TECH CHINESE ACADEMY OF AGRI SCI