Non woven fabrics do not have other attachment processing techniques during production. In order to ensure the diversity and special functions of the materials required for the product, special processing techniques are applied to the raw materials of non-woven fabrics.
Different techniques have been developed based on different processing modes, resulting in varying effects.
Film coating and laminating are common processing techniques for non-woven fabrics, with the aim of making them waterproof.
1. Production process
Laminated non-woven fabric
It is a composite material that applies lotion adhesive on the surface of non-woven fabric wool embryo, and then through drying, high temperature treatment, cooling and other processes, combines the non-woven fabric embryo coated with adhesive and polyethylene film, so as to strengthen its waterproof, anti pollution performance and tensile strength.
Coated non-woven fabric
It is a professional machine that heats plastic rice into liquid, and then pours this plastic liquid onto one or both sides of non-woven fabric through the machine. One side of the machine has a drying system that can quickly dry and cool the poured plastic liquid layer, and finally produce coated non-woven fabric. It serves to enhance, thicken, prevent moisture, water, and oxidation.
The difference between non-woven film coating and laminating lies in the production technology and raw materials, and the basic principles of appearance and function of the produced products are the same.
2. The difference between coated and laminated nonwoven fabric
- Production process
The laminated non-woven fabric is produced by compounding the already produced PE film and non-woven fabric in high-temperature equipment.
Coated non-woven fabric uses equipment to melt plastic and spray it on the surface of non-woven fabric, which has the advantages of fast production speed and low cost. - Color and appearance
Laminated non-woven fabric is a composite product with superior smoothness and color compared to laminated non-woven fabric.
Coated non-woven fabric has obvious small holes on the surface due to the one-time molding of the film and non-woven fabric. - Aging rate
Pe film laminated non-woven fabric is added with anti-uv additives before production, so anti-uv effect is better than coated non-woven fabric.
Coated non-woven fabrics have been produced, and the technical cost of adding anti-uv additives after plastic dissolution is too high. Generally, coated non-woven fabrics rarely add anti-uv additives, and aging speed is fast in the sun. - Physical properties
Coated non-woven fabric has good waterproof performance, tensile strength, and scratch resistance, but its breathability is relatively poor due to the presence of the coated film.
Coated non-woven fabric also has good waterproof performance and tensile strength, as well as better breathability and flexibility, making it easier to process into various shapes. - Thickness
The coating is relatively thick, usually between 25-50 microns in thickness.
The coating is relatively thin, with a thickness generally between 5-20 microns.
Overall, although both belong to non-woven fabrics, there are certain differences in their application fields due to differences in manufacturing processes and physical properties between laminated non-woven fabrics and laminated non-woven fabrics.
3. Common film materials
- Polyethylene (PE): Polyethylene is a commonly used film material that has good transparency, flexibility, and waterproof performance. Polyethylene film is commonly used in fields such as food packaging and pharmaceutical packaging.
- Polypropylene (PP): Polypropylene is another common coating material that has high strength, water resistance, and barrier properties. Polypropylene film is commonly used in fields such as tobacco packaging and stationery packaging.
- Polyester (PET): Polyester is a synthetic resin that is resistant to high temperatures and wear, and can be used as a film material for coated paper. Polyester film has excellent mechanical and optical properties and is commonly used in fields such as electronic product packaging and labeling.
- Nanocomposite film: By adding nanomaterials (such as zinc oxide nanoparticles, silica, etc.) to traditional film materials, the physical properties of the film can be improved, such as enhanced barrier properties, antioxidant properties, and antibacterial properties, thereby improving packaging quality.
- Secondly, there are also other materials such as polyvinyl chloride (PVC), biaxially oriented polypropylene film (BOPP), PEVA film, aluminum plated film, frosted film, etc.