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| How to control the thickness difference of aluminum foil |
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Posted by: ZellaHyday - 01-11-2022, 03:02 AM - Forum: aluminium faq
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It is a characteristic of aluminum box rolling that the thickness deviation is difficult to control. The thickness difference of 3% is not difficult to control in the production of plate and strip, but it is more difficult to control in the production of aluminum foil.
As the thickness of the aluminum box becomes thinner, its micro-conditions can affect it, such as temperature, oil film, and oil and gas concentration. A roll of aluminum foil can be rolled up to hundreds of thousands of meters, and the rolling time is as long as about 10 hours, and the error of thickness measurement is easy to form with time.
The only way to adjust the thickness of aluminum foil is tension and speed.
These factors all cause difficulty in thickness control of aluminum foil rolling.
Therefore, to truly control the thickness difference of the aluminum box within 3%, many conditions are needed to ensure: use the aluminum foil blank of the qualified thickness; adjust and control the reduction and roll shape during rolling, and the roll is ground according to the specified parameters ; Stabilize the rolling process; frequently measure the thickness of the aluminum box during the rolling process, so as not to be undetected when the side thickness system fails.
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| What are the benefits of aluminum foil containers? |
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Posted by: ZellaHyday - 01-11-2022, 02:48 AM - Forum: aluminium faq
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Aluminum foil (Aluminium foil), also known as aluminum foil, is called tin foil in Hong Kong. It is a tool made of flattened metal aluminum. It is mainly used for cooking in the kitchen, to hold food, or to make something that can be easily made. Clean materials. Hundreds of thousands of tons of aluminum foil are used worldwide to protect and package food, cosmetics and chemicals. Most aluminum foil is shiny on one side and dull on the other. The aluminum foil paper used for food can be wrapped on both sides of the food. Generally, it is recommended to wrap it with a bright surface to improve the heat transfer effect.
History: The original tin foil was really made of tin. Tin foil was harder than aluminum foil, and it also brought a tin smell to food. Therefore, after the aluminum price dropped, aluminum foil replaced tin foil in daily life. However, because metal aluminum can affect the development of the brain, the surface of the current aluminum foil is coated with a coating to avoid the release of metal aluminum.
Function: Aluminum foil paper is usually used to carry food (such as: aluminum foil paper trays). When roasting, it is used to wrap bean sprouts, potatoes, sweet potatoes, etc. to prevent them from burning. Sometimes used for decoration. Modern aluminum foil is made of aluminum and can also be used as aluminum electrodes for electrolysis. There are also hairdressers who perm the guests with aluminum foil. Some people also use aluminum foil to absorb the oil in the soup. Aluminum foil is also widely used for insulation, heat exchange, and as a conductor. Generally, the thickness of aluminum foil used in paper-packed beverage packaging and food packaging bags is only 6.5 microns. This thin layer of aluminum is water-resistant, umami-resistant, bacteria- and stain-resistant. Food
It is very common to use aluminum foil paper trays to hold food. Although aluminum foil paper trays are disposable, the composition is aluminum, which is less harmful to nature.
Barbecue: Some foods (such as sweet potatoes, mushrooms, etc.) must be wrapped in aluminum foil to avoid burning. It is wrapped in aluminum foil to cook seafood, oyster mushrooms, etc., which can retain the umami flavor. Electric hair
Some hair stylist will wrap the hair with aluminum foil to heat the hair and have better heat transfer effect. Improper hair using aluminum foil can cause burns and poor hair quality.
Oil absorption: After opening the aluminum foil paper in a ball, you can absorb the oil in the soup. The principle is that during the crumpling of aluminum foil paper, the surface tension of the aluminum foil paper will be amplified.
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| Which packaging is suitable for aluminum foil bags? |
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Posted by: ZellaHyday - 01-11-2022, 02:25 AM - Forum: aluminium faq
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First, flexible packaging aluminum foil
Flexible packaging is a bag-type container made of flexible composite packaging materials. The emergence of flexible packaging has greatly improved the mechanization and automation of the food and beverage industry, and accelerated the modernization and socialization of people’s diet. In developed countries, flexible packaging has become one of the main packaging forms for food and beverages, replacing canned and bottled to a certain extent. In recent years, China’s flexible packaging market has also developed rapidly. So far, 10 aluminum foil composite production lines have been introduced. Different processes such as dry lamination, hot melt lamination, and extrusion lamination can be adopted according to the different uses of flexible packaging. Flexible packaging not only has moisture-proof and fresh-keeping effects, but also can print a variety of patterns and text, is an ideal material for modern commercial packaging. With the improvement of people’s living standards, there is still much room for development of flexible packaging aluminum foil.
Second, medicine foil
Medical packaging aluminum foil mainly includes water-based, injection-type easy-open bottle caps and medicinal PTP aluminum foil. Because PTP aluminum foil has the advantages of moisture resistance, easy carrying, safety and health, it is widely used in the international pharmaceutical industry. China has been using aluminum foil to package medicines since 1985. So far, packaging aluminum foil only accounts for 20% of pharmaceutical packaging materials. In recent years, the pharmaceutical foil market has developed rapidly. On the one hand, the pharmaceutical market has developed rapidly, but mainly because 20% aluminum foil is used in pharmaceutical packaging. The proportion of applications in it is constantly increasing.
Third, automotive composite foil
With the booming development of China’s auto industry and the continuous increase of the aluminization rate of automobiles, the market demand for automotive foils has rapidly increased. There are two types of automotive foils. One is the composite foil for automotive air conditioners. Aluminization, the annual demand for aluminum foil reaches 15,000 tons; the other is a composite foil for automobile radiators, which is used to manufacture automobile water tank radiators, automobile condensers and evaporators. At present, the aluminization rate of automotive water tanks reaches 40%, and the annual demand is The amount is about 0.3 million tons.
Fourth, aluminum foil for electrolytic capacitors
The aluminum foil used in electrolytic capacitors is an corrosive material that works under polar conditions. It has high requirements on the structure of the aluminum foil. There are three types of aluminum foils used: cathode foils with a thickness of 0.015mm to 0.06mm; high-voltage foils with a thickness of It is 0.065mm ~ 0.1mm, and requires aluminum foil to be produced from high-purity aluminum; low-pressure foil, thickness is 0.06mm ~ 0.1mm.
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| What are the precautions during aluminum foil transportation? |
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Posted by: ZellaHyday - 01-11-2022, 02:23 AM - Forum: aluminium faq
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The modes of transportation of aluminum boxes include cars, trains, ships and other means of transportation.
During transportation, it is not allowed to mix aluminum foil with active chemical products and wet materials. At the same time, keep the carriage and cabin dry, clean and pollution-free. Aluminum foil shall be transported in closed carriage or ship warehouse, or gondola. However, during transportation, it must be tightly covered and bound with rainproof and snow tarpaulin to ensure that water, rain and snow will not enter the packaging box and aluminum foil products.
During transfer and inversion, it shall be stored in the warehouse. If it is stored in a simple warehouse or in the open air, it must be tightly covered and bound with rainproof and snow tarpaulin. At the same time, the lower packing box shall be padded with a height of no less than 100mm. The lifting, loading and unloading of packing box and well frame aluminum foil roll shall be handled with care to avoid damaging the packing box and aluminum foil.
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| Why doesn't aluminum rust? |
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Posted by: ZellaHyday - 01-11-2022, 01:54 AM - Forum: aluminium faq
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This is a wrong question. Aluminum also rusts, but aluminum does not rust like iron until the rust is finished.
Metal is oxidized by oxygen in the air, which is called rust. Aluminum reacts with oxygen to form aluminum oxide, which is aluminum rust. Aluminum rust is very thin, its thickness is only one ten thousandth of a millimeter, but it is very hard and very wear-resistant. It is close to the surface of the aluminum, so that the aluminum inside cannot reach the outside air, and prevents the aluminum from continuing to rust.
Alumina film also has a "nemesis": one is alkali and the other is acid. Alumina encounters them and chemically reacts, forming compounds, which are very easy to fall off. Dishes often contain acid and alkali ingredients, so no! want! Put the fruit wine in the dish in aluminum utensils to avoid corrosion and damage to the aluminum pan. Besides, no! want! Because the surface of the aluminum pan is gray and embarrassing, use sand to wipe it. Although you wipe a layer of oxide film, the aluminum pan will be brighter, but this can only make you happy for a while. If the protective film on the surface is lost, the aluminum pan will continue to oxidize, and the gray color of the aluminum oxide will still show up in front of your eyes; and the aluminum pan is getting thinner and thinner, affecting its service life.
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| lithium ion battery foil |
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Posted by: ZellaHyday - 01-11-2022, 01:52 AM - Forum: Knowledge & Technique
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Lithium battery foil is the cathode current collector in lithium batteries and the carrier of lithium battery cathode slurry. It plays an important role in lithium batteries. Lithium batteries have high requirements for product safety, so it is also necessary when choosing suppliers. Strictly grasp the supplier's strength and technical level.
Characteristics of lithium battery foil:
1. The surface of aluminum foil should be uniform in color, clean, flat in shape, free of aluminum chips, aluminum powder, no corrosion marks, obvious roll marks, crushed pits and other defects that affect use.
2. The surface has no rolling defects such as mottling, herringbone, and bright lines that affect the use, and surface chromatic aberration that affects the use.
3. The oil level on the surface of the aluminum foil in the H18 state should reach 31 dyne. At present, our company can provide up to 33 dyne battery foil with no oil spots and no serious oil odor.
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| How should aluminum foil be stored |
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Posted by: ZellaHyday - 01-11-2022, 01:45 AM - Forum: aluminium faq
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Storage of aluminum foil
Aluminum foil products shall not be stored in the open air, but shall be stored in the warehouse. The ground in the warehouse shall be flat, clean, dry, well ventilated, and the room temperature shall be 16-35 ℃, and the relative humidity shall be less than 70%. Aluminum foil products should not be stored together with acid-base and other active chemical products and articles with high humidity.
When transporting from a low-temperature area to an area with high temperature and humidity, do not rush to open the package or warehouse, store it in a dry place for a certain time, and then open the package or warehouse after the temperature of the aluminum foil rises.
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| The difference between super high alumina brick and ordinary high alumina brick |
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Posted by: mtaluminum - 01-10-2022, 03:00 AM - Forum: aluminium faq
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The difference between super high alumina brick and ordinary high alumina brick
Special high alumina bricks and ordinary high alumina bricks are different in performance, index and usage. The main reason is the difference in internal quality. Special grade bricks are made of special grade bauxite raw materials. The content of the special grade raw material AL2O3 is more than 85% and the density is 2.8g/cm³. The common raw material AL2O3 is 75% and the density is about 2.6. There is a big difference in the density of the products produced. The refractoriness of ordinary bricks is 1780℃. The refractoriness of the special grade brick is 1820℃, and the firing temperature is about 30℃ higher than that of ordinary bricks. The service life of special grade high alumina bricks is twice that of ordinary high alumina bricks. The crystal phases of high alumina bricks are mainly mullite and glass phases. And the corundum phase composition, the higher the aluminum content, the larger the corundum phase ratio. Therefore, there is a big difference in compressive strength and abrasion resistance.
There is also a difference in load softening temperature between special grade bricks and ordinary bricks. Because the firing temperature differs by about 30°C, the load softening temperature also differs by more than 30°C. Then there is the use temperature. The use temperature of ordinary high alumina bricks is divided into three different grades of high alumina bricks: three grades, two grades, and one grade. ℃.
The high-temperature structural strength, thermal shock stability and slag resistance of the premium bricks are also 1-2 times higher than that of ordinary high-alumina bricks. The slag resistance of ordinary high alumina bricks is not strong, while the special grade bricks have strong slag resistance and are particularly resistant to fatigue at high temperatures. For example, anchor bricks are an example. High aluminum content and good strength are not conducive to use. The aluminum content of anchor bricks is about 55% and has good flexibility. If the aluminum content is too high, the strength is too high, which will make the castable more prone to cracks.
In short, whether it is super high-alumina bricks or ordinary bricks, it is necessary to understand the performance of each grade to meet various temperature and erosion conditions to choose different grades of high-alumina bricks.
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| Anti-stripping high alumina brick |
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Posted by: mtaluminum - 01-10-2022, 02:58 AM - Forum: aluminium faq
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Due to the process and equipment requirements of industrial kilns in metallurgy, building materials, glass, electric power, chemical industries and other industries, refractory materials must be built as linings. The performance of refractory materials directly affects the quality and output of industrial products in the production process, as well as the life of industrial kilns and products. Therefore, in the design, manufacture and use of industrial kilns, refractories have always been a topic of concern to enterprises and scientific and technical personnel.
Anti-stripping high-alumina brick is a new type of high-aluminum material specially produced for the production of cement kiln lining in my country. It has excellent thermal shock stability, high load softening temperature, high high temperature strength, alkali resistance and clinker corrosion, high temperature wear resistance, peeling resistance, anti-skinning, ring formation and low thermal conductivity. It has been widely used in my country's new dry process kiln, Liboer kiln and wet process kiln. The parts used include the kiln door cover, the rising flue, the cooling belt, the decomposition belt, the safety belt, the transition belt, the rear wall and side wall of the cooler, and the curved roof of the beam. It has been successfully applied in almost all internal kilns.
composition:
Anti-stripping high alumina brick is a special product developed for alumina production clinker firing belt.
The anti-stripping high alumina brick is a fired product made by high-grade high alumina bauxite clinker and ZrO2 containing synthetic materials as raw materials and high-pressure molding in a certain proportion. The product has strong anti-stripping ability, but also has the properties of resistance to potassium, sodium, sulfur, chlorine and alkaline salt, and low thermal conductivity. It is an ideal material for cement void transition zone and decomposition zone. It can also be used for cement kiln doors. Covers, coolers and other parts.
The main mineral composition is mullite (3Al203·2SiO), corundum (Al03) and glass phase. The solid phase reaction between the calcareous composition and the brick lining is mainly:
CaO+Al03→CaO·Al203
CaO+Fe203→CaO·Fe203
The alumina clinker kiln material has the characteristics of high temperature, high alkali and strong wear. The calcined material contains about 20% soda ash, and the normal firing temperature is 1250°C-1360°C. In the past, ordinary clay bricks, high alumina bricks and phosphate combined high alumina bricks have been used as linings, but because of these refractory materials The load softening temperature is too low or too high, or the thermal shock stability is too poor, or is not resistant to wear, etc., which can cause the kiln skin to fail to hang, and the bricks will be severely peeled off, alkali corrosion, and abrasion, so that the kiln lining life is only about 120 days. The operating rate is only 70-80%, which seriously restricts continuous production. Therefore, the rotary kiln lining must have good high temperature resistance, corrosion resistance, certain strength and wear resistance, and should have excellent thermal shock during medium time. stability.
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| Advantages of Aluminum Foil Pans |
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Posted by: ZellaHyday - 01-07-2022, 06:00 AM - Forum: Knowledge & Technique
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Aluminum foil is made of aluminum. The lightweight, heat-conducting properties of aluminum make it great for cooking all sorts of food. They generally come in different shapes and sizes catering to whatever it is you’re baking, and they’re a lot more affordable compared to regular baking trays.
Another great benefit of aluminum foil pans is that each tray can serve multiple purposes. You can bake directly in an aluminum foil pan, use it as a vessel to carry your baked goods, serve in them and simply dispose of them afterward. For a baker, this saves a lot of money, time, and effort.
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