Many problems might rise in the aluminium foil production process, among which are thickness difference, water marks and oil remains. Here we deal with the three.
The thickness difference of aluminum foil rolls is often encountered in the rolling process of aluminum foil production. 3% thickness difference may be easy to achieve in aluminum plate manufacturing, but it is very difficult in aluminum foil production. Because the thickness of aluminum foil is very thin, such as drug foil, i.e. medical aluminum foil, the thickness is usually 0.02mm-0.025mm, many fine conditions will have a serious impact on it. Such as temperature, oil film, oil and gas concentration, etc. The length of a roll of aluminum foil can reach tens of thousands of meters, the rolling time is long, and it is easy to cause the uneven thickness. The only way to adjust the thickness is the tension speed. Therefore, it is very difficult to control the thickness difference of aluminum foil within 3%, and the requirements for equipment and environment are very strict.
A water mark refers to the water drop on the aluminium foil food before rolling. After rolling, some white spots will be formed. If the water mark is slight, it will affect the appearance and brightness of the aluminum foil surface. If it is serious, it may cause the ribbon of the aluminum foil. The first section of water mark is caused by the water drop in the rolling mill on the surface of aluminum foil or the water drop in the oil is formed in the rolling process. It is necessary to control the water content in the oil and keep the rolling mill clean and sanitary to avoid the water mark of food aluminum foil.
Oil remains are often encountered in the rolling step of aluminum foil production process, which means that there are some extra oil in the aluminum foil food after rolling, that is, oil other than rolling oil film. This kind of oil is complex and dirty. It is usually dripped on the surface of the aluminum sheet by the oil at the roll neck or at the outlet of the rolling mill. Oil pollution has a great impact on the quality of aluminum foil. Some aluminum is used as packaging or decoration materials, and the surface must be smooth and bright. Oil pollution will also affect the thickness of the finished aluminum foil roll. In the annealing process, it is easy to form bubble like bulge, and the oil pollution is relatively dirty, which will form a lot of residues and affect the use of aluminum foil. Oil pollution is a very important index to evaluate the quality of aluminum foil.
The cost of aluminium foil is relatively stable, although it’s influenced by aluminium ingot price, currency exchange rate and shipment cost. The impact of the factors above is smaller in comparison to process methods and raw material type of the foil.
Harga aluminium foil of 8011 rolls ranges between $2750 to $3000 per metric ton. The minimum ordering quantity is at least 2 tons, and some suppliers make it 5 tons. It can be used in medicine packaging, food packaging, lunch box material, tape foil, cable foil, milk cover material, bottle cover material and many other fields. Among our hard-core products, 8021 aluminium foil boasts excellent insulation of moisture, light and heat, used more frequently as a raw material for composite products. 8021 aluminium foil cost is higher than 8011. We have both rolls of thickness from 0.019mm to 0.2mm, and width from 100mm to 1650mm.
In comparison to 8011 and 8021, 8079 aluminum foil displays a higher
strength and better elongation. In addition to its advantages like
moisture-proof, airtight, light-proof, wear-resistant, fragrant, non-toxic and
tasteless performances, it is easy to process beautiful patterns and patterns of
various colors on it, which helps it win more popularity. 8079 aluminum foil is
widely used in food packaging, medicine packaging, battery soft package and
other fields. As a result, the cost of aluminium foil 8079 is higher, too.
Household aluminium foil and food grade aluminium foil are not the same thing. Household aluminium foil rolls are definitely of food grade, but food grade rolls are not necessarily household ones. By household we mean kitchen or used at home directly.
Food grade aluminum foil is free from toxic elements like heavy metals, and its surface is clean without rolling oil after being annealed at high temperatures. It’s further divided into household and packaging aluminum foil. The former is made of 8011 aluminium alloy, with a thickness between 0.015mm and 0.02mm, and width from 300mm to 450mm. Household rolls spotted at shops are usually small, weighing only less than 2kg, packed in a cardboard box. These, however, are not what Haomei Aluminium supplies. We usually get in contact with clients from overseas who purchase rolls with a weight no less than 20kg and cut the rolls into parts of shorter length and small width. The cut parts are eventually rolled into smaller rolls and placed in cardboard boxes sent to super markets. There’s no need to worry about safety problem of 8011 aluminium foil for household use from China, for most of our products are exported to America and Europe.
Packaging aluminum foil is the other important use of food grade aluminum foil. It’s used to package food. The world’s food industry is in an important period of vigorous development. The emergence of aluminum foil for food packaging has greatly improved the level of food processing and accelerated the modernization of people’s diet. There are two main applications of aluminum foil in food packaging: one is aluminum-plastic or aluminum paper composite packaging; the other is aluminum-plastic paper multilayer composite packaging. China’s food aluminum foil demand is about 30,000 tons / year. Haomei Aluminum is a large-scale manufacturer of aluminum foil raw materials for food packaging. The raw materials of aluminum foil for food packaging are mainly 1 series, 3 series and 8 series products, mainly including model numbers 1060, 1100, 3003, 8011, 8021 and so on. According to the needs of the packaged food, the softness and hardness of the alloy is selected, that is, the alloy state. The commonly used states are H14, H16, and H18.
Nowadays aluminium foil packaging material has become ubiquitous in various industries. Even people who leads the simplest life can not have avoided using products packed in aluminium foil. Packaging aluminium foil hold toothpaste, facial cream and mini cakes hot from the oven. We have got quite used to them. The application of aluminium foil for packaging in food industry has a history of over a century. Despite this, a question keeps haunting us even today: is it safe to use aluminium foil as a packaging material?
The answer is positive. Tests show that packaging aluminium foil is free
from potential health problems of heavy metals, ethanol, oil or paints. The
currently adopted aluminum foil composite technology in China has filled in the
domestic blanks of similar technologies, reaching the highest level in
international market. Made by the high barrier polypropylene composite
technology, the PP film on the inside of aluminium foil packaging materials can
effectively isolate the food from the metal sheet, which has a high degree of
hygiene and can effectively extend the preservation time of the food. Food
packaged in such a material does not change color or taste. In addition, the use
of aluminium foil for packaging attributes a lot to environmental protection.
The packaging materials can be recycled in a more environmental way than
plastics. Food containers such as metal cans and boxes made of aluminum foil
have the characteristics of light weight, zero rust, and high food preservation
safety, widely used in packaging of device paste food, sauce food, and wet and
dry canned food, including paste, cream, tomato sauce, chili sauce, apple sauce,
peanut butter, canned fish and various meat canned foods.
Haomei packaging aluminum foil, all made of domestic raw materials, helps
to save more than 50% of the raw material aluminum compared with the traditional
process, which greatly reduces the product cost and provides a price advantage
for your products. Safe, light, hygiene, convenient and environmentally
friendly, aluminum foil packaging materials will replace tinplate food
containers and become a new upgraded product in the packaging industry.