Classification of the aluminum foil

Classification of aluminum foil

thickness

Aluminum foil can be divided into thick foil, single zero foil and double zero foil according to the thickness difference.

① Heavy gauge foil: a foil with a thickness of 0.1 ~ 0.2mm.

② Medium gauge foil: foil with thickness of 0.01mm and less than 0.1mm/.

③ Light gauge foil: the so-called double gauge foil refers to the foil with two zeros after the decimal point when its thickness is measured in mm, which is usually aluminum foil with a thickness less than 0.01, that is, aluminum foil with a thickness of 0.005~0.009mm. In foreign countries, aluminum foil with thickness ≤ 40ltm is sometimes called "light gauge foil", while aluminum foil with thickness >40btm is collectively called "heavy gauge foil".

shape

Aluminum foil can be divided into roll aluminum foil and sheet aluminum foil according to its shape. Most of the aluminum foil deep-processing raw materials are supplied in rolls, and only a few handicraft packaging occasions use sheet aluminum foil.

Aluminum foil can be divided into hard foil, semi-hard foil and soft foil.

① Hard foil: aluminum foil that has not been softened (annealed) after rolling. When it has not been degreased, there is residue on the surface. Therefore, the hard foil must be degreased before printing, laminating and coating. If it is used for forming, it can be directly used.

② Semi hard foil: aluminum foil with hardness (or strength) between hard foil and soft foil, usually used for forming processing.

③ Soft foil: aluminum foil softened after full annealing after rolling. The material is soft and there is no residual oil on the surface. Soft foils are used in most applications, such as packaging, composites, electrical materials, etc.

surface state

Aluminum foil can be divided into one side polished aluminum foil and two sides polished aluminum foil according to the surface state.

① Single side polished aluminum foil: double rolled aluminum foil, which is bright on one side and black on the other side after being rolled, is called one side polished aluminum foil. The thickness of one side polished aluminum foil shall not exceed 0.025mm.

② Double sided gloss aluminum foil: single rolled aluminum foil, both sides of which are in contact with the roll. Due to different surface roughness of the roll, the two sides of the aluminum foil are divided into mirror faced gloss aluminum foil and ordinary two faced gloss aluminum foil. The thickness of two-sided polished aluminum foil is generally not less than 0.01mm.

Machining status

Aluminum foil can be divided into plain foil, embossed foil, composite foil, coated foil, colored foil and printed foil.

① Plain foil: aluminum foil without any other processing after rolling, also known as light foil.

② Embossed foil: aluminum foil with various patterns pressed on the surface.

③ Composite foil: composite aluminum foil formed by bonding aluminum foil with paper, plastic film and paperboard.

④ Coated foil: aluminum foil coated with various resins or paints.

⑤ Colored aluminum foil: aluminum foil coated with a single color on the surface. ⑥ Printed aluminum foil: aluminum foil that forms various patterns, patterns, words or pictures on the surface by printing. It can be one color, up to 12 colors.

Soft aluminum foil can also be further pressed into 40 foil for high-grade decoration.

Characteristics of aluminum foil

Aluminum foil has a clean, sanitary and shiny appearance. It can be made into integrated packaging materials with many other packaging materials, and the printing effect of aluminum foil surface is better than other materials. In addition, aluminum foil has the following characteristics:

(1) The surface of aluminum foil is extremely clean and sanitary. No bacteria or microorganisms can grow on the surface.

(2) Aluminum foil is a non-toxic packaging material, which can be in direct contact with food without any danger to human health.

(3) Aluminum foil is a kind of tasteless and odorless packaging material, which will not make the packaged food have any peculiar smell.

(4) If the aluminum foil itself is not volatile, it and the packaged food will never dry or shrink.

(5) No matter at high temperature or low temperature, the aluminum foil will not have grease penetration.

(6) Aluminum foil is an opaque packaging material, so it is a good packaging material for products exposed to sunlight, such as margarine.

(7) Aluminum foil has good plasticity, so it can be used to package products of various shapes. It can also be made into containers of various shapes.

(8) Aluminum foil has high hardness and tensile strength, but its tear strength is small, so it is easy to tear.

(9) The aluminum foil itself cannot be sealed by heating, and it can only be sealed by applying a hot material such as PE on its surface.

(10) When aluminum foil contacts with other heavy metals or heavy metals, it may have adverse reactions.