Temperature and humidity control method used in refined rice spray polishing process

Abstract

The invention discloses a temperature and humidity control method for a refined rice spray polishing process, which comprises the following steps of: pre-experiment: quickly narrowing a temperature and humidity range by using a single factor method; fine optimization: establishing a precise model by adopting a response surface method; online verification: importing the optimal parameters into a polishing production line, and performing fine adjustment by using a real-time monitoring system.According to the method, by deeply optimizing a temperature and humidity control method in the refined rice spray polishing process, the optimal polishing temperature and humidity of a certain type of rice can be accurately locked within 3-5 days, the polishing efficiency and the finished product quality are remarkably improved, the rice processing technology is optimized, and the production cost is reduced. And the product quality and taste are improved. The optimal process parameters are determined by systematically exploring the changes of the surface smoothness, color and nutritional ingredients of the rice under different temperature and humidity conditions. The method not only helps to reduce rice grain breakage in the processing process and improve the yield, but also can ensure the eating quality and storage performance of the rice, and meets the requirements of the market for high-quality rice.

Description

Technical Field

[0001] The invention relates to the technical field of grain reprocessing, in particular to a method for controlling temperature and humidity in a spray polishing process of refined rice. Background Art

[0002] Spray polishing of refined rice is a process that enhances the appearance and taste of rice. By spraying a thin layer of edible oil or water solution on the rice surface and then polishing it, the rice becomes smoother and whiter, increasing its commercial value. However, existing spray polishing processes often struggle to precisely control temperature and humidity, leading to excessive moisture absorption or insufficient drying of the rice during processing, impacting the quality and storage stability of the final product. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a method for controlling temperature and humidity in a spray polishing process of refined rice, which can effectively solve the problems in the background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a method for controlling temperature and humidity during the spray polishing process of refined rice, comprising the following steps: preliminary experiment: using a single-factor method to quickly narrow the temperature and humidity range; fine optimization: using the response surface methodology to establish an accurate model; online verification: importing the optimal parameters into the polishing production line and fine-tuning them using a real-time monitoring system.

[0005] As a preferred technical solution of the present invention, the preliminary experiment includes the following steps:

[0006] Step 1: Fix the humidity, optimize the temperature, select three humidity parameters, quickly test 4 to 5 temperature gradients at each humidity, record the polishing gloss and broken rice rate of the rice, and obtain the optimal temperature;

[0007] Step 2: Fix the temperature, optimize the humidity, and test 3 to 4 humidity gradients near the optimal temperature;

[0008] Step 3, cross-validation: Repeat the validation three times for the initially screened combination to obtain the optimal temperature and humidity combination.

[0009] As a preferred technical solution of the present invention, the method of fine optimization is: setting a temperature and humidity range, selecting 15 to 20 groups of temperature and humidity combinations within this range for polishing experiments, testing the gloss, broken rice rate, whiteness, and moisture content of the products after the experiment, fitting a polynomial model with software, generating a response surface plot, and locking the optimal temperature and humidity combination.

[0010] As a preferred technical solution of the present invention, the method for detecting glossiness is to use a gloss meter to quickly measure the surface reflectivity of rice grains, the method for detecting broken rice rate is to quickly sieving and weighing, the method for detecting whiteness is to use a whiteness meter for real-time detection, and the method for detecting moisture content is to use a near-infrared moisture meter for detection.

[0011] As a preferred technical solution of the present invention, the moisture content of the rice grains before the polishing experiment needs to be stabilized at 14% to 15% to avoid interference with the experimental results.

[0012] As a preferred technical solution of the present invention, the temperature of the polishing experiment is 80° C. and the humidity is 95% RH.

[0013] As a preferred technical solution of the present invention, the online verification includes the following steps:

[0014] Step 1: Install a high-precision temperature and humidity sensor in the polishing machine to transmit temperature and humidity data in real time;

[0015] Step 2: Install a temperature and humidity execution unit in the polishing machine to control the temperature and humidity inside the polishing machine;

[0016] Step 3: Install an online near-infrared instrument in the polishing machine to monitor the moisture and gloss changes of rice grains in real time;

[0017] Step 4: Set up a control system to fine-tune the spray volume or heating power through the temperature and humidity execution unit when monitoring the increase in broken rice rate or decrease in gloss;

[0018] Step 5: Record and draw the temperature, humidity, broken rice rate, and glossiness data change curve within a unit time, and determine the temperature and humidity corresponding to the optimal broken rice rate and glossiness.

[0019] Compared with the existing technology, the present invention has the following beneficial effects: By deeply optimizing the temperature and humidity control method during the spray polishing process of refined rice, this method can accurately lock in the optimal polishing temperature and humidity for a certain type of rice within 3 to 5 days, significantly improving polishing efficiency and finished product quality, optimizing the rice processing technology, and improving product quality and taste. By systematically exploring the changes in rice surface smoothness, color, and nutritional content under different temperature and humidity conditions, the optimal process parameters are determined. This not only helps to reduce rice grain breakage during processing and improve product yield, but also ensures the edible quality and storage performance of the rice, meeting the market demand for high-quality rice. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] The present invention provides a technical solution: a method for controlling temperature and humidity during the spray polishing process of refined rice, comprising the following steps:

[0022] Preliminary experiment: including the following steps:

[0023] Step 1: Fix the humidity, optimize the temperature, select three humidity parameters, quickly test 4 to 5 temperature gradients at each humidity, record the polishing gloss and broken rice rate of the rice, and obtain the optimal temperature;

[0024] Step 2: Fix the temperature, optimize the humidity, and test 3 to 4 humidity gradients near the optimal temperature;

[0025] Step 3, cross-validation: Repeat the validation three times for the initially screened combination to obtain the optimal temperature and humidity combination.

[0026] Fine optimization: Based on the optimal temperature and humidity combination obtained from the preliminary experiment, a temperature and humidity range is set. Within this range, 15 to 20 temperature and humidity combinations are selected for polishing experiments. The products after the experiment are tested for gloss, broken rice rate, whiteness, and moisture content. The polynomial model is fitted with software to generate a response surface plot to lock in the optimal temperature and humidity combination.

[0027] Among them, the glossiness detection method is to use a gloss meter to quickly measure the surface reflectivity of rice grains, the broken rice rate detection method is to quickly sieving and weighing, the whiteness detection method is to use a whiteness meter for instant detection, and the moisture content detection method is to use a near-infrared moisture meter for detection.

[0028] The moisture content of rice grains before polishing experiment needs to be stabilized at 14% to 15% to avoid interference with experimental results.

[0029] The temperature of the polishing experiment is 80℃ and the humidity is 95%RH, because too high temperature (>80℃) can easily cause rice grains to burst, and too high humidity (>95%RH) can increase drying energy consumption.

[0030] Online verification includes the following steps:

[0031] Step 1: Install a high-precision temperature and humidity sensor in the polishing machine to transmit temperature and humidity data in real time;

[0032] Step 2: Install a temperature and humidity execution unit in the polishing machine to control the temperature and humidity inside the polishing machine;

[0033] Step 3: Install an online near-infrared instrument in the polishing machine to monitor the moisture and gloss changes of rice grains in real time;

[0034] Step 4: Set up a control system to fine-tune the spray volume or heating power through the temperature and humidity execution unit when monitoring the increase in broken rice rate or decrease in gloss;

[0035] Step 5: Record and draw the temperature, humidity, broken rice rate, and glossiness data change curve within a unit time, and determine the temperature and humidity corresponding to the optimal broken rice rate and glossiness.

[0036] It should be noted that the starch properties of japonica rice and indica rice are different and need to be tested separately. Usually, the optimal temperature of japonica rice is 5 to 10°C lower than that of indica rice.

[0037] Through the above method, the optimal polishing temperature and humidity for a certain type of rice can be accurately locked within 3 to 5 days, significantly improving the polishing efficiency and finished product quality.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for controlling temperature and humidity in a spray polishing process for refined rice, characterized in that: The following steps are involved: Preliminary experiment: Use the single factor method to quickly narrow the temperature and humidity range; Fine optimization: Use response surface methodology to build accurate models; Online verification: Import the optimal parameters into the polishing line and fine-tune them using a real-time monitoring system.

2. The temperature and humidity control method for the spray polishing process of refined rice according to claim 1, wherein The preliminary experiment includes the following steps: Step 1: Fix the humidity, optimize the temperature, select three humidity parameters, quickly test 4 to 5 temperature gradients at each humidity, record the polishing gloss and broken rice rate of the rice, and obtain the optimal temperature; Step 2: Fix the temperature, optimize the humidity, and test 3 to 4 humidity gradients near the optimal temperature; Step 3, cross-validation: Repeat the validation three times for the initially screened combination to obtain the optimal temperature and humidity combination.

3. The temperature and humidity control method for the spray polishing process of refined rice according to claim 1, wherein The method for fine optimization is as follows: setting a temperature and humidity range, selecting 15 to 20 sets of temperature and humidity combinations within this range for polishing experiments, testing the gloss, broken rice rate, whiteness, and moisture content of the products after the experiment, fitting a polynomial model with software, generating a response surface plot, and locking in the optimal temperature and humidity combination.

4. The method for controlling temperature and humidity in a spray polishing process for refined rice according to claim 3, wherein: The glossiness detection method is to use a gloss meter to quickly measure the surface reflectivity of rice grains, the broken rice rate detection method is to quickly sieving and weighing, the whiteness detection method is to use a whiteness meter for real-time detection, and the moisture content detection method is to use a near-infrared moisture meter for detection.

5. The method for controlling temperature and humidity in a spray polishing process for refined rice according to claim 3, wherein: The moisture content of the rice grains before the polishing experiment needs to be stabilized at 14% to 15% to avoid interference with the experimental results.

6. The method for controlling temperature and humidity in a spray polishing process for refined rice according to claim 3, wherein: The temperature of the polishing experiment was 80° C., and the humidity was 95% RH.

7. The method for controlling temperature and humidity in a spray polishing process for refined rice according to claim 1, wherein: The online verification includes the following steps: Step 1: Install a high-precision temperature and humidity sensor in the polishing machine to transmit temperature and humidity data in real time; Step 2: Install a temperature and humidity execution unit in the polishing machine to control the temperature and humidity inside the polishing machine; Step 3: Install an online near-infrared instrument in the polishing machine to monitor the moisture and gloss changes of rice grains in real time; Step 4: Set up a control system to fine-tune the spray volume or heating power through the temperature and humidity execution unit when monitoring the increase in broken rice rate or decrease in gloss; Step 5: Record and draw the temperature, humidity, broken rice rate, and glossiness data change curve within a unit time, and determine the temperature and humidity corresponding to the optimal broken rice rate and glossiness.