What are the materials for the rice cooker liner? The rice cooker liner is made of aluminum liner, stainless steel liner, composite multilayer liner and ceramic (zisha) liner. So, what kind of material is the rice cooker liner?
The liner is in direct contact with food. It is the core factor in determining the quality of the rice cooker. Therefore, the liner naturally becomes the focus of differentiated competition among the brand products in the market. Therefore, the rice cookers in the market will have so many famous liners: Taojing liner, space black crystal liner, black crystal energy thick, nano black crystal liner, porcelain crystal liner, citrine liner, hard Oxygen liner, black diamond liner, stainless steel liner, etc.
In fact, there are so many famous inner tanks, which are called the material of the inner liner and the processing technology of the inner surface of the inner tank. Therefore, which kind of inner tank is good or bad is not what it is called, but the key to seeing it adopting What kind of material is made, and what is the surface treatment process?
What material is the liner made of?
The materials for making rice cooker liners are mainly aluminum, stainless steel, composite multilayer materials and ceramics (purple sand).
Aluminum liner:
Aluminum has uniform heat conduction, easy forming and beautiful appearance, and can be compounded by other metals or alloys. It is the main material of the mid-range pot. However, the aluminum liner cannot be in direct contact with food and must be protected from the surface.
The aluminum plate for making the liner is mostly 3003 aluminum plate, ordinary rice cooker liner of 3L and 4L specifications, plate with thickness of 1.5-1.6mm, and plate of 5L and 6L with 1.8-2.2mm plate.
Thinner stretching techniques are commonly used in the manufacture of aluminum liners, which maintain the necessary thickness of the pot and the bottom of the pot, and the liner appears to be thicker while saving material.
Blazer buzzword: "thick kettle"
The "thick kettle" liner refers to the inner liner of the pot and the wall of the pot made of thick metal material. Because food is transferred by the inner tank, under certain conditions, the heat transferred is proportional to the heat transfer area, that is, the effect of heat transfer in the inner tank is proportional to the thickness of the inner tank. Only when the thickness of the liner reaches 3-4mm, can fully satisfy the heat transfer passage required for cooking food, and achieve the effect of "Ding Shi" of the "rice flavour" of Zhongming Dingshijiao. If the thickness of the liner does not reach 3-4mm, it cannot be called a real "thick kettle".
This is why the rice cooker or electric pressure cooker of the real "thick pot" liner will not be cheap, because if it is a real "thick pot, thick" product, the raw material of the liner, 4L liner can be used to 3mm and 3mm or more. The plate, 5L or L-liter liner will use 3-5mm thick plate, the manufacturing cost is much higher than the ordinary liner.
Blazer buzzword: "Honeycomb"
Honeycomb liner refers to the design of the inner heat-effect grain of the inner tube. This design is more efficient than the traditional planar inner tank, and it can improve the energy efficiency.
Stainless steel liner:
The best stainless steel inner liner is made of 304 sheet metal. 304 stainless steel has excellent stainless steel corrosion resistance and good resistance to intergranular corrosion. Generally, a 4L inner liner adopts a plate of about 0.5, and a 5L and a 6L inner liner adopts a plate of about 0.8. A slightly different grade of stainless steel liner will be processed with 202 plates. The rust resistance of 202 plates is slightly worse than that of 304 plates. The lower end of the stainless steel liner is made of 201 sheets. Due to the fact that the amount of harmful metal in the 201 stainless steel that can be purchased in China is generally difficult to meet the national sanitary standards for stainless steel food containers, the rice cooker with a very low price must be carefully selected.
The stainless steel liner does not require surface treatment and can be used directly. However, the surface of stainless steel is not sticky, especially when cooking rice.
Blazer buzzword: "recovery"
Due to the poor thermal conductivity of stainless steel, in order to make up for this deficiency, a layer of soaking aluminum must be applied on the outside of the bottom, and a layer of stainless steel is used as a surface layer. The liner used in this treatment is usually called “re- bottom".
Composite multilayer material liner
The composite multilayer material liner is made of a variety of materials and can be basically divided into the following types:
The outer aluminum inner steel has two layers ("steel" refers to stainless steel) composite plate liner, and its inner surface is made of stainless steel, which not only satisfies the requirement that the inner surface is stainless steel, but also improves the thermal conductivity of the stainless steel by utilizing the overall soaking action of aluminum.
The outer steel inner two-layer composite inner tank, the inner inner wall of the inner tank is made of stainless steel, and the inner layer of aluminum cannot directly contact the food, and needs performance protection treatment to ensure food hygiene and improve non-stickiness.
The steel-aluminum steel three-layer composite liner has stainless steel inside and outside, and the middle is an aluminum interlayer. Since the inner wall of the inner tank is made of stainless steel, the surface of the inner tank does not need to be protected. Layer of pure copper to further improve the thermal conductivity of the liner. There is also a hollow layer added to the composite multilayer material to reduce the heat loss to the outside when the IH method is used to heat the inner layer, thereby saving energy, but the sensing layer must be inside the hollow layer. In addition, glass microspheres or ceramic microsphere coatings can be applied to the outer coating for heat insulation to reduce heat loss to the outside and save energy. However, the inner liner of such composite multi-layer material is basically used in high-end products, and the price of the product is basically above the dry yuan.
Ceramic (purple) liner
Zisha is a pottery and is a safe inorganic material. The inner liner made of sable is rich in natural iron and various trace elements such as zinc and calcium which are beneficial to human health. The cooked food tastes good, and the surface is super hard and wear resistant, acid and alkali resistant and corrosive, and thermal insulation performance. Wait a minute.
What are the surface treatments of the liner?
The surface of the liner is treated. One is to ensure that the contact between the liner and the food meets food hygiene standards, and the other is to improve the non-stickiness of the liner.
At present, the surface treatment technologies used in the liner are mainly as follows:
1. Spraying silicone anti-adhesive material on the surface of aluminum bile
The initial silicon anti-stick coating has a certain protection and anti-sticking effect, and the cost is low. The early rice cooker has more use in the inner liner, and is currently only used in some low-grade pots.
2. Spraying organic enamel coating on the surface of aluminum gallbladder
Organic fluorine coating is the main raw material for the surface protection of the inner liner. At one time, the fluorine coating was affixed with a "toxic" label that could not be torn off. In fact, the Teflon incident in 2004 made Teflon alleged to be a harmful culprits, a key raw material processing aid in the Teflon manufacturing process, a perfluorooctanoic acid (PFOA). Ammonium perfluorooctanoate is an ammonium salt of perfluorooctanoic acid. Perfluorooctanoic acid is a soap-like substance that can be used to make anti-stick surfaces and various consumer goods. It is used as a processing aid in about four thousandths (based on the amount of fluoropolymer resin). The addition amount is added to the fluoropolymer concentrated emulsion. The decomposition temperature of ammonium perfluorooctanoate is relatively low, and decomposition starts at 130 °C. Polytetrafluoroethylene (PTFE) fluorocarbon coatings must be baked, baked at a high temperature of 380 ° C - 420 ° C, and the requirements are very strict, the temperature difference is required to be controlled within ± 5 ° C, most fluorocarbon coatings must be 2 - 3 sprays, 1-2 bakes. At such high temperatures, PFOA has volatilized, so it is impossible to contain ammonium perfluorooctanoate in the coating of the cookware.
In view of the processing process of the rice cooker liner spraying, firstly, various formula materials are mixed with the fluorine paint concentrated emulsion to become a coating having a relatively high viscosity, and the inner liner is sprayed with the coating, and the sintering is performed once after the spraying. Once, after the burn, spray again, it is necessary to spray multiple times to reach the corresponding thickness. After spraying, since the fluorine coating is raw, it is cooked, that is, "sintered", and the sintering is performed at a temperature of 400 ° C for 5 minutes. However, the ammonium perfluorooctanoate began to decompose more than 200 degrees, and the PFOA was destroyed and decomposed during the sintering process at 400 ° C for 5 minutes. Therefore, fluorine coatings are safe for use in cookware. The recommendations for use below 260 degrees Celsius are primarily for the life and performance of the cookware. The cooking oil used in daily life is generally at 200-220 ° C. As long as it is used reasonably and does not dry, the temperature will not exceed 260 ° C. Of course, this has a certain relationship with the thickness of the substrate of the pot itself. If the substrate is too thin, hot spots will be generated.
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