Product Description
1. Thickness
Aluminum foil is categorized by thickness into thick foil, single zero foil, and double zero foil:
- Thick Foil: Aluminum foil with a thickness between 0.1-0.2 mm.
- Single Zero Foil: Foil with a thickness between 0.01 mm and less than 0.1 mm.
- Double Zero Foil: Refers to foil with two zeros after the decimal point when measured in millimeters. Typically, this refers to foil with a thickness of less than 0.01 mm, commonly between 0.005-0.009 mm.
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2. Shape
Aluminum foil can be classified by shape into rolls and sheets. Most raw materials for further processing are supplied in rolls, while sheets are primarily used in small-scale manual packaging applications.
By hardness, aluminum foil is divided into hard foil, semi-hard foil, and soft foil:
- Hard Foil: Rolled aluminum foil that has not undergone softening (annealing) treatment. Without degreasing, its surface retains residual oil. Hard foil must be degreased before printing, laminating, or coating but can be used directly for forming processes.
- Semi-Hard Foil: Aluminum foil with hardness or strength between hard foil and soft foil. It is commonly used for forming processes.
- Soft Foil: Rolled aluminum foil that has undergone full annealing to become soft, leaving no residual oil on its surface. This type is widely used in packaging, composite materials, and electrical applications.
3. Surface State
Aluminum foil can also be classified by surface finish into single-sided bright foil and double-sided bright foil:
- Single-Sided Bright Foil: Produced by double-roll processing, resulting in one bright side and one matte side. Single-sided bright foil typically has a thickness of no more than 0.05 mm.
- Double-Sided Bright Foil: Produced by single-roll processing, resulting in both sides being bright. Depending on the roughness of the rollers, it can be classified into mirror-finish double-sided foil and standard double-sided foil. Double-sided foil generally has a thickness of at least 0.01 mm.
4. Processing State
Aluminum foil can be further categorized based on its processing state into plain foil, embossed foil, composite foil, coated foil, colored foil, and printed foil:
- Plain Foil: Rolled foil without any additional processing, also known as raw foil.
- Embossed Foil: Foil with various patterns embossed onto its surface.
- Composite Foil: Foil combined with materials like paper, plastic film, or cardboard to create a composite structure.
- Coated Foil: Foil with a surface coated with various resins or paints.
- Colored Foil: Foil with a single color applied to its surface.
- Printed Foil: Foil with printed patterns, designs, text, or images on its surface. Printed foil can feature one color or up to 12 different colors.
Soft aluminum foil can also be further processed into ultra-thin four-zero foil, commonly used in decorative applications.
5. Features
Aluminum foil has a clean, smooth surface and integrates well with other materials for composite packaging. It also offers superior printing capabilities compared to other materials. Additionally, aluminum foil has the following characteristics:
- Heat Resistance: Aluminum foil can withstand high temperatures.
- Malleability: It can be used to package products of various shapes or molded into a variety of container shapes.
- High Hardness and Tensile Strength: While its tensile strength is high, its tear resistance is low, making it easy to tear.
- Sealability: Aluminum foil itself cannot be heat-sealed. To achieve heat-sealing, a heat-sealable coating (e.g., PE) must be applied to its surface.
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