The utensils used in microwave ovens should be made of nonmetallic materials, and never use metal utensils. Microwave oven appliances shall meet the following conditions:
(1) has good microwave transmittance;
(2) Good heat resistance;
(3) Good cold and hot shock resistance;
(4) Meet the food hygiene requirements (including the hygiene requirements under high temperature conditions).
If the temperature of the vessel itself is not high and there is no fire in the furnace, it means that the vessel itself has good microwave transmittance, low microwave loss and does not reflect microwaves, so it is suitable for microwave ovens. If the temperature of the vessel itself is high or fire occurs in the furnace (for example, the metal edge on the ceramic bowl may catch fire in the microwave oven), it means that the microwave transmission of the vessel is not good, the microwave loss of the vessel itself is large, and it contains substances that reflect microwaves, so it is not suitable for use in the microwave oven.
(1) Available utensils.
(1) glass cooker. Include glassware made of microcrystalline glass, glassware made of borosilicate, ceramic glass and other heat-resistant materials.
② Ceramic cookware. Fine pottery, coarse pottery and porcelain ware, that is, ordinary ceramic bowls, plates and pots can be used. However, containers with metal decorations may spark or fall off, so please do not use them.
③ Heat-resistant plastic utensils. All heat-resistant plastic utensils are acceptable. But please use heat-resistant glass or ceramic utensils for oily food.
4 stir-fry Microwave cooking is a special utensil for frying and frying. Such as fried steak, fried meat pie, fried steak and so on. The surface of this special container is coated with microwave absorbing material to absorb microwave and make it heat. Food is heated on the surface of the container to produce the cooking effect of frying and frying. In order to use the frying pan better, please read the instructions of the special frying pan carefully.
⑤ Plastic wrap and heat-resistant pe bag. When cooking, it can be used to cover vegetables or cover containers, but it is not allowed to directly wrap meat and fried food.
(2) Do not use appliances.
(1) metal appliances. Aluminum pot, enamel pot, stainless steel pot and other metal containers can't be penetrated by microwaves, so they will collide with the inner wall of the furnace when they touch the metal, so they can't be used. Note that using metal utensils is also easy to damage the microwave oven.
2 lacquerware. The paint on the lacquerware may peel off and melt after being heated, resulting in harmful substances and cracks in the container. Please don't use it.
③ Heat-resistant plastic containers. Ordinary plastic containers have poor heat resistance and cannot be used as cookware in microwave ovens.
④ Heat-resistant glass container. When cooking food with oil, the temperature may be very high and it is easy to break the glass container, so heat-resistant glass containers cannot be used. Organic glassware is also not suitable for use.
⑤ Grass, willow, wood, bamboo and paper products. These containers can be used if heated for a short time, but they may burn if heated for a long time. Please don't use them.
The prices of microwave oven appliances vary greatly due to different materials. Plastic microwave tableware has the most complete variety and lower price. It is characterized by single tone inside and outside, and the price generally ranges from a few yuan to dozens of yuan. High-quality glassware is transparent, easy to observe the cooking situation of food, good heat resistance, but more expensive.
Microwave is an electromagnetic wave. The microwave oven consists of power supply, magnetron, control circuit and cooking cavity. The power supply provides a high voltage of about 4000 volts to the magnetron. Under the excitation of the power supply, the magnetron continuously generates microwaves, which are coupled into the cooking cavity through the waveguide system. There is a rotatable agitator near the entrance of the cooking cavity. Because the agitator is a fan-shaped metal, it can reflect microwaves in all directions after rotation, so it can evenly distribute microwave energy in the cooking cavity, thus heating food. The power range of microwave oven is generally 500 ~ 1000 watt.
During the Second World War (1945), Spencer, an American radar engineer, happened to find the chocolate bar in his pocket melted and sticky while doing radar experiments. He suspected that it was caused by his body temperature, and later he found the thermal effect of microwave in continuous experiments. ? [1] Taking advantage of this thermal effect, the United States issued a 1 patent on microwaves in 1945, and Raytheon Company of the United States developed the world's first 1 microwave oven in 1947. In the 1940s, microwave ovens were mainly used in industry and commerce. After people's continuous improvement, the household microwave oven was born in western Europe in 1955, and began to enter the family in the 1960s. In the 1970s, due to the problems of radiation safety and convenient operation, the cost of the microwave oven continued to drop, and it was further popularized and used, forming an important family industry, and at the same time, it was constantly improved in variety and technology. In 1980s and 1990s, the continuous application of control technology and sensing technology made microwave ovens widely popular.