Microwave drying method for reed leaves

Abstract

The invention discloses a microwave drying method for reed leaves. The microwave drying method comprises the following steps: S1, cleaning treatment; s2, blanching is conducted; s3, air drying; s4, hot air drying; s5, microwave drying; and S6, cooling with cold air. High-quality and efficient drying of the reed leaves can be achieved, and the storage life of the reed leaves is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of zongzi leaf processing technology, specifically relating to a microwave drying method for zongzi leaves. Background Technology

[0002] In most parts of southern my country, palm leaves (also known as reed leaves) have traditionally been used to wrap zongzi (sticky rice dumplings), taking advantage of their unique bamboo aroma and preservative properties. Palm leaves grow in vast mountainous regions, possessing extensive root systems and strong vitality. They are not only excellent soil and water conservation vegetation but also an inexhaustible resource, a "green bank" for mountain people. Palm leaves contain abundant chlorophyll and various amino acids beneficial to the human body. They can be used to extract natural fragrances and food additives, possessing a pleasant aroma that evokes a sense of returning to nature. Besides wrapping zongzi, palm leaves are also used for packaging other foods, as table decorations and food garnishes, and for weaving utensils, making lunch boxes, and cutting into various shapes.

[0003] Fresh bamboo leaves have a high moisture content, making them prone to mold and rot. However, after drying, the moisture content drops to a safe range (usually ≤12%), allowing them to be stored at room temperature for more than a year. Traditional sun-drying methods use sunlight to quickly dehydrate fresh bamboo leaves, but this is inefficient and the quality is difficult to control. Summary of the Invention

[0004] To address the above problems, this invention provides a microwave drying method for zongzi leaves, which can achieve high-quality and efficient drying of zongzi leaves, thereby extending their shelf life.

[0005] The present invention is achieved through the following technical solution.

[0006] A microwave drying method for zongzi leaves, characterized by comprising the following steps: S1. Cleaning treatment Wash the fresh bamboo leaves and drain off the surface moisture. S2, Hot and Bleaching Place the bamboo leaves in water at 60-80 degrees Celsius and blanch for 5-15 minutes, then remove and drain the surface water. S3, air dry Place the blanched bamboo leaves in an environment with air humidity below 60% and wind speed above 1m / s to air dry. S4, Hot air drying After air-drying, the bamboo leaves are dried with hot air. The conditions for hot air drying are a temperature of 40-55 degrees Celsius and a drying time of 20-60 minutes. S5, Microwave Drying Transfer the hot-air dried bamboo leaves to a microwave drying device and dry them for 2-5 minutes at a power of 600-1200W. S6, Cooling Air After microwave drying, the bamboo leaves are cooled with cold air at a temperature below 10 degrees Celsius before being packaged.

[0007] Preferably, the addition of a natural greening agent to the water is also included. The natural greening agent includes one or more of tea polyphenols, rosemary extract, and bamboo leaf flavonoids.

[0008] Preferably, in step S3, the air drying time is 20-60 minutes, and the ambient temperature is controlled to be below 30 degrees Celsius.

[0009] Preferably, in step S5, intermittent microwave drying is used.

[0010] Preferably, in step S5, the operating parameters for intermittent microwave drying are: drying for 10-20 seconds, stopping for 5-10 seconds, and controlling the total drying time to be 2-5 minutes. Detailed Implementation

[0011] The present invention will be further described below with reference to specific embodiments. It should be noted that the following embodiments are merely illustrative examples of the present invention, but the scope of protection of the present invention is not limited thereto. All equivalent substitutions made by those skilled in the art in accordance with the spirit of the present invention fall within the scope of protection of the present invention. Example 1

[0012] A microwave drying method for zongzi leaves includes the following steps: S1. Cleaning treatment Wash the fresh bamboo leaves and drain off the surface moisture. S2, Hot and Bleaching Place the bamboo leaves in water at 60-80 degrees Celsius and blanch for 5-15 minutes, then remove and drain the surface water. S3, air dry Place the blanched bamboo leaves in an environment with air humidity below 60% and wind speed above 1m / s to air dry. S4, Hot air drying After air-drying, the bamboo leaves are dried with hot air. The conditions for hot air drying are a temperature of 40-55 degrees Celsius and a drying time of 20-60 minutes. S5, Microwave Drying Transfer the hot-air dried bamboo leaves to a microwave drying device and dry them for 2-5 minutes at a power of 600-1200W. S6, Cooling Air After microwave drying, the bamboo leaves are cooled with cold air at a temperature below 10 degrees Celsius before being packaged. Example 2

[0013] A microwave drying method for zongzi leaves includes the following steps: S1. Cleaning treatment Wash the fresh bamboo leaves and drain off the surface moisture. S2, Hot and Bleaching Place the bamboo leaves in water at 60-80 degrees Celsius and blanch for 5-15 minutes, then remove and drain the surface water. Add a natural greening agent to the water, which may include one or more of the following: tea polyphenols, rosemary extract, and bamboo leaf flavonoids. S3, air dry After blanching, place the bamboo leaves in an environment with air humidity below 60% and wind speed above 1m / s to air dry for 20-60 minutes, while keeping the ambient temperature below 30 degrees Celsius. S4, Hot air drying After air-drying, the bamboo leaves are dried with hot air. The conditions for hot air drying are a temperature of 40-55 degrees Celsius and a drying time of 20-60 minutes. S5, Microwave Drying After hot air drying, transfer the bamboo leaves to a microwave drying device and dry them for 2-5 minutes at a power of 600-1200W. Intermittent microwave drying is used, and the working parameters for intermittent microwave drying are: dry for 10-20 seconds, stop for 5-10 seconds, and control the total drying time to 2-5 minutes. S6, Cooling Air After microwave drying, the bamboo leaves are cooled with cold air at a temperature below 10 degrees Celsius before being packaged.

Claims

1. A microwave drying method for zongzi leaves, characterized in that, Includes the following steps: S1. Cleaning treatment Wash the fresh bamboo leaves and drain off the surface moisture. S2, Hot and Bleaching Blanch the bamboo leaves in 60-80 degrees Celsius water for 5-15 minutes, then remove and drain the surface water. S3, air dry Place the blanched bamboo leaves in an environment with air humidity below 60% and wind speed above 1m / s to air dry. S4, Hot air drying After air-drying, the bamboo leaves are dried with hot air. The conditions for hot air drying are a temperature of 40-55 degrees Celsius and a drying time of 20-60 minutes. S5, Microwave Drying Transfer the hot-air dried bamboo leaves to a microwave drying device and dry them for 2-5 minutes at a power of 600-1200W. S6, Cooling Air After microwave drying, the bamboo leaves are cooled with cold air at a temperature below 10 degrees Celsius before being packaged.

2. The microwave drying method for zongzi leaves as described in claim 1, characterized in that, Step S2 also includes adding a natural greening agent to the water. The natural greening agent includes one or more of tea polyphenols, rosemary extract, and bamboo leaf flavonoids.

3. The microwave drying method for zongzi leaves as described in claim 1, characterized in that, In step S3, the air drying time is 20-60 minutes, and the ambient temperature is controlled to be below 30 degrees Celsius.

4. The microwave drying method for zongzi leaves as described in claim 1, characterized in that, In step S5, intermittent microwave drying is used for microwave drying.

5. The microwave drying method for zongzi leaves as described in claim 4, characterized in that, In step S5, the operating parameters for intermittent microwave drying are: drying for 10-20 seconds, stopping for 5-10 seconds, and controlling the total drying time to be 2-5 minutes.