Food sterilization technology mainly includes heat sterilization and non-thermal sterilization. Among them, heat sterilization mainly includes: moist heat sterilization, dry heat sterilization, microwave sterilization, electrothermal sterilization and electric field sterilization; non-thermal sterilization mainly includes: chemical and biological sterilization, irradiation sterilization, Ultraviolet sterilization, pulse sterilization, ultra-high static pressure sterilization, pulsed electric field (PEF) sterilization, and vibration magnetic field sterilization. The following is a detailed introduction to these sterilization technologies:
First, heat sterilization
1, damp heat sterilization
Heat sterilization is a heat treatment form with the main purpose of killing microorganisms, and moist heat sterilization is one of the most important methods. It is a sterilization method in which steam or hot water is used as a heat medium or directly by steam jet heating.
A heat energy converter (such as a boiler) is used to convert the heat energy of combustion into hot water or steam as a heating medium, and then heat energy of hot water or steam is transferred to the food by a heat exchanger, or steam is directly sprayed into the food to be heated.
2, dry heat sterilization
Microwaves are sterilized by burning or dry hot air and are called dry heat sterilization. Although the dry main hot air is not as strong as the wet heat steam, it is easy to use and is suitable for sterilization of glassware and porcelain, so it is widely used in laboratory and production practice.
Dry heat refers to high heat with a relative humidity of less than 20%. Dry heat sterilization is conducted by air and has a slow heat transfer effect. The general propagule can be killed in dry heat at 80-100 ° C for 1 hour, and the spores need to be killed at 160-170 ° C for 2 hours.
3, microwave sterilization Microwave (microwave) refers to the electromagnetic wave with a wavelength of about 1m ~ 10mm, often divided into four bands of meter wave, centimeter wave, millimeter wave and sub-millimeter wave.
The frequency of the microwave (300MHz to 300GHz) is between the radio frequency (ultra-short wave) and the far-infrared frequency (low-frequency end). Due to its high frequency, it is also called UHF electromagnetic wave in some cases.
4, electrothermal sterilization Electrothermal sterilization, also known as "ohmic sterilization", it uses electrodes to pass current through the object, due to the existence of impedance loss, dielectric loss, etc., eventually converts electrical energy into heat, so that the inside of the food generates heat to achieve the purpose of sterilization.
Second, non-thermal sterilization
1. Chemical and biological sterilization Mainly refers to the purpose of inhibiting bacteria or sterilizing by adding bacteriostatic agents and preservatives to foods.
2, ultraviolet sterilization UV sterilization technology is the use of ultraviolet radiation to cause the molecular structure of the microbial cell core protein on the surface of the object to change and cause death.
3, ultra high static pressure sterilization
The ultra-high static pressure (UHP or HHP) treatment technology of food refers to placing the food sealed in the elastic container in a pressure system of water or other liquid as a pressure transmitting medium, and treating it with a pressure of 100 MPa or more to achieve sterilization and destruction. Enzymes and improving the functional properties of foods.
Ultra-high pressure treatment is usually carried out at room temperature or at a lower temperature. Under certain high pressure, food protein denaturation, starch gelatinization, enzyme inactivation, life stop, and microorganisms such as bacteria are killed.
4. Pulsed electric field (PEF) sterilization Pulse electric field sterilization is to place food in an instantaneous high-voltage electric field generated between two electrodes. Because high-voltage electric pulse can destroy the cell membrane of bacteria, change its permeability and kill cells.
5, vibrating magnetic field sterilization magnetic sterilization using 6000 magnetic strength, the food is placed between the N pole and the S pole, after continuous swing, without heating, can achieve 100% sterilization effect, no food ingredients and flavors influences.
6. Radiation sterilization food irradiation refers to the use of radiation to irradiate food (including raw materials), delay the development of certain physiological processes (germination and maturation) of fresh food, or to treat insecticides, disinfection, sterilization, mildew, etc. The process of extending the preservation time, stabilizing and improving the quality of food.
Pressure Compensated Emitter Products
Shandong Chunyu Water-saving Irrigation Equipment Co., Ltd., founded in 2011, is located in Laiwu High-tech Zone, Jinan City. It is a high-tech enterprise focusing on innovative and efficient emitter mold manufacturing and emitter product research and development and production. After nearly ten years of innovation and development, it is the invisible champion enterprise in Shandong Province, and now it is in a leading position in this field in China.
Spring rain people-oriented, build talent highland. At present, the company has 16 high, fine and advanced technical personnel, and cooperates with a number of scientific research institutes, forming a mold design, emitter testing, flow testing and other professional technical personnel team. In recent years, it has obtained 3 invention patents, 33 utility model patents and 3 patent awards. In 2019, it was identified as an intellectual property advantage enterprise in Jinan. It has undertaken 4 provincial science and technology innovation projects and won 2 second prizes of Shandong Science and Technology Progress Award. The company has built Jinan drip emitter mold engineering technology research center, the company has a slow wire cutting, CNC machining center, precision EDM machine, 3D projection measuring instrument, CNC engraving, laser engraving and other advanced processing equipment. Mature technology and rich experience support the excellent quality of Chunyu. Spring Rain pays attention to every link of production, implements 8S management, strictly controls the quality of products at the beginning, the middle and the end, and forms the seamless link of production management. The company has independently researched and developed flat emitter molds with full hot runner, cylindrical emitter molds with full hot runner and other products. With excellent quality, competitive price and good after-sales service, the company is well known at home and abroad, and has been sold well in Egypt, India, Iran, Turkey, Saudi Arabia, the United States and other countries.
With the vision of "building a global professional emitter mold supplier" and the mission of "providing solutions for efficient and innovative production of global water-saving irrigation enterprises", the company takes "scientific and technological innovation to scale new heights; Keep improving, the pursuit of excellence; Honesty and trustworthiness, win-win cooperation "for the values of the enterprise. For the construction of water - saving and resource-saving society to make a positive contribution.
Pressure Compensated Emitter Products,Pressure Compensated Emitter,Button Pressure Compensation Drip,Pressure Compensation Emitter Mold
Shandong Spring Rain Water Saving Irrigation Equipment Co.,Ltd. , https://www.drippermould.com