Process types of non-woven filter media materials
What is a non-woven filter medium？
The filtration of air and water is crucial for our health and safety. Filters come in various shapes and sizes and can be made from textile or non-woven fabrics.
Woven fabrics are made by weaving individual strands of materials such as monofilament or fiber yarns on a weaving machine, while the production process of non-woven fabrics involves first bonding the fibers together in a sequential or random manner, and then bonding the layers of the non-woven fabric with the polymer to form a porous material suitable for filtration
The method of manufacturing filter media mainly depends on the type of filtration required. There are six main methods, as follows:
1. Sorting method
The filtering medium of carding machines is traditionally used for masks and filtering edible oil, coolant oil, and milk. Usually resin or thermal bonding is used, which in some cases is replaced by other methods described below.
2. Wet method
Wet and wet filtration media are used for swimming pool filters, coffee filters, and high-efficiency particulate air filters. Their production process is similar to papermaking, where on standard papermaking equipment, a mixture of artificial, natural, or glass fiber short fibers forms a medium similar to paper.
3. Melt blown method
Melt blown filter media are ideal for particle filtration, such as dust, asbestos, and smoke. This is a common type of filter in respirators and is easy to mass produce. It is formed without the use of fibers: on the contrary, the melted polymer is blown into a microporous network.
4. Spunbonded method
The spunbonded filter medium is lightweight and can be used for air and liquid filtration. Just like media blown by melt, they do not require the use of fibers, but are spun together from nylon, polyester, or polypropylene. In addition, they are lightweight and heat-resistant.
5. Acupuncture method
The manufacturing of needle punched filter media is a mechanical process that involves the use of needle felt needles to locate and interlock fibers in the spinning or carding mesh. The three-dimensional structure of pinhole filter media is an ideal filter for capturing particle surfaces and interiors. This is a commonly used type of filtration for cleaning, such as inlet and outlet water.
6. Composite method
Non woven fabric composite is the process of using different techniques to bond multiple layers of non-woven materials and polymers into composite materials that combine the performance of each layer. In the process of manufacturing filter media, layering is ideal for heating, cooling, and ventilation in homes, buildings, and cars.