Glass fiber is made by melting glass into liquid glass and drawing. Glass fiber diameter is divided into several levels: the fiber diameter of primary glass fiber is generally greater than 20 μ m; The fiber diameter of intermediate glass fiber is generally 10 ~ 20 μ m; Advanced (Textile) glass fiber 3 ~ 10 μ m。
The glass fiber with monofilament diameter less than 4um is also called ultrafine fiber. Different monofilament diameters not only have different fiber properties, but also affect the fiber production process, output and cost. Generally, 5 ~ 10um fiber is used as textile products, and 10 ~ 14um fiber is generally suitable for twistless roving, non-woven fabric, chopped fiber felt, etc.
The diameter of glass fiber is determined by the aperture of platinum leakage plate and drawing speed. Generally, the finer the monofilament, the more expensive the fiber cost- It is related to the difficult production process and low output. In the process of drawing and subsequent processing of glass fiber products, different wetting agents or coating agents are added according to different applications of glass fiber. On the other – hand, the finer the monofilament, the more coupling agent per unit area. Affected by additives, the service temperature of glass fiber products is also different.