Seed coating technology Surface film measurement Unikang Technology Co., LTD
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01 What is seed coating technology? 02 The purpose and significance of seed coating 03 Types of seed coating 04 The method of seed coating 05 Thickness control and measurement of seed coating 01 Seed coating technology was a plant protection technique that was widely promoted in China in the 1990s. Seed coating refers to the process of evenly covering the surface of seeds with a seed coating agent containing various components such as insecticides, fungicides, compound fertilizers, trace elements, plant growth regulators, slow-release agents and film-forming agents in a certain proportion by mechanical or manual methods, forming a smooth and firm film. As the seeds start to sprout, germinate, emerge and grow, the effective components in the coating are gradually absorbed by the plant roots and conducted to all parts of the seedling plants, enabling the seeds and seedlings to control seed-borne bacteria, soil-borne bacteria and underground and above-ground pests. The micro-fertilizers in the drug film can fully exert their efficacy before the base fertilizer takes advantage. Therefore, the coated seeds grow vigorously during the seedling stage, with dark green leaves, well-developed root systems and strong plants, thus achieving the goal of increasing production and income. Seed coating technology is a mature crop cultivation technique. Over the years, this technology has played a significant role in increasing agricultural production and income. Since the beginning of the new century, seed coating technology has been widely promoted and applied in agricultural production, significantly enhancing the quality and yield of crops. 02 Seed coating technology is a new technique that emerged along with the development of agricultural modernization. The main purpose is to make the seeds suitable for sowing, and to play a comprehensive role in disease prevention, pest control, enhancing drought resistance, cold resistance, moisture resistance, promoting seed germination, increasing yield and improving product quality. Seed coating generally has the following advantages: 1. For seeds with small and irregular grains, after pelletizing treatment, the volume of the seeds can be increased, and their shapes and sizes can be uniform and consistent, which is conducive to mechanical sowing 2. Reduce the incidence of diseases and the rate of dead seedlings during the seedling stage of crops, and improve the effect of disease prevention and seedling protection. 3. Prevent and control pests and diseases during the seedling stage 4. Promote the development and growth of seedlings, with well-developed root systems and strong plants, thereby achieving the goal of increasing production and income. 5. Reducing environmental pollution is conducive to environmental protection. 6. Save seeds and pesticides, and reduce production costs. 7. Improve the appearance of seeds and enhance their commercial quality. 03 At present, seed coating methods are mainly divided into three categories One: Pelletized seeds Tutorial Use adhesives to adhere non-seed stains such as fungicides, insecticides, dyes and fillers to the surface of seeds. It is usually made spherical. This method is mainly applicable to seeds of crops, vegetables, etc. Two: Coated seeds Tutorial By using adhesives, trace elements, fungicides and insecticides and other substances are adhered to the surface of seeds to improve the germination characteristics of seeds. The difference from pelleting seeds lies in that this method does not significantly change the shape of the seeds. Suitable for medium and large-sized seeds. Three: Coated seeds Tutorial By using film-forming agents, non-seed substances such as fungicides, insecticides, micro-fertilizers and dyes are wrapped around the surface of seeds to form a film. It is generally applicable to large and medium-sized seeds. The coated seeds produced by this method are also the main objects of our measurement 04 There are mainly two types: mechanical coating method and manual coating method. Mechanical coating method It is suitable for large seed companies to use coating machines for coating. (1) Ordinary coating machineA common coating machine mainly consists of a coating pot power system, a heating system and an exhaust system. During operation, the coating pot rotates at a certain speed, and the tablets roll around inside the pot. The coating material solution is intermittently sprinkled into the pot by hand. Preheated hot air is continuously blown into the coating pot for drying. When the coating meets the specified quality and requirements, the discharge can be stopped. (2) Fluidized coating machineA fluidized coating machine is a device that uses nozzles to spray coating liquid onto the surface of tablets suspended in the air to achieve the coating purpose. (3) Mesh coating: The mesh coating machine is a relatively novel coating equipment. Its structural feature is that there are round holes (mesh holes) with a diameter of 1.8 to 2.5 mm on the pot body of the coating pot. When in operation, the mesh coating pot rotates at a certain speed, the tablets roll inside the pot, and the coating liquid is sprayed in through nozzles. The purified air preheated to a certain temperature enters the coating pot through the intake pipe and the mesh holes at the top of the pot body, then passes through the pores of the tablets in motion, and finally enters the exhaust pipe through the mesh holes at the bottom of the steel body. Manual coating method There are three simple manual coating methods: (1) Plastic bag coating method: Put two spare plastic bags of the same size together. Take a certain number of seeds and the corresponding amount of seed coating agent and put them in the inner plastic bag. Tie the bag opening and then quickly rub it with both hands until well mixed. Pour it out and set it aside. (2) Coating in large bottles or small iron drums: Prepare large covered glass bottles or small iron drums. If a large bottle or small iron drum can hold 2000 grams, add 1000 grams of seeds and the corresponding amount of seed coating agent, and shake quickly immediately until well mixed. Pour it out and set it aside. (3) Round-bottomed large pot coating: First, fix the large pot, clean and dry it in the sun. Then, weigh a certain amount of seeds and pour them into the pot. Next, pour the corresponding amount of seed coating agent onto the seeds and quickly stir and mix them with a spatula or wooden stick to ensure that the seed coating agent solidifies evenly and quickly on the surface of the seeds into a film. After that, take them out and put them in a double-layer polypropylene woven bag for proper storage and future use. 05 For the control of the surface film thickness of seed coating, the Filmetrics film thickness gauge F3-s1310 can be used to test the thickness of the seed coating film. Match the product model Filmetrics F3-s1310 Film thickness Measuring instrument Measurement principle Light of different wavelengths will be reflected at the top and bottom of the film, and the total amount of reflected light is the superposition of the reflected light from these two parts. Due to the wave-like nature of light, these two parts of reflected light may interfere with each other to be complementary (adding intensity) or cancel each other out (subtracting intensity), depending on their phase relationship. The phase relationship depends on the optical path difference of the reflected light from these two parts, which is determined by the thickness of the film, the optical constant, and the wavelength of the light. When the phase difference is an integer multiple of the wavelength. When constructive superposition occurs, the reflectivity is at its maximum. When the phase difference is half a wavelength, destructive superposition occurs and the reflectivity is low. The superposition between integer multiples and half wavelengths, with a reflectance between the maximum and minimum reflections, thus forms an interference pattern. Measurement parameters Actual measurement operation The seed coating was tested using F3-s1310 Fix the seeds and test the smooth surface. The thickness result obtained by testing with F3-s1310 was 58.66 microns. The author of this article Yuan Haoqiang Sales Manager of South China Region With nearly 10 years of experience in the film measurement industry, I have extensive application experience in the panel industry. We have helped clients such as Nanshan Glass and HKC solve difficult problems in measurement through customized renovations. Do your best today, and perhaps you will do even better tomorrow. We have been deeply involved in the film measurement industry for over a decade. No matter what problems you have in film measurement, our technical experts can provide you with valuable advice or solutions. Welcome to call us. We are very glad to discuss your application issues with you. 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