The production process of fiberglass mainly includes raw material preparation, melting, forming, and post-processing. Below is a detailed introduction:

Raw Material Preparation

- Selection of Raw Materials: The primary raw materials for fiberglass are various ores, such as quartz sand, limestone, dolomite, and boron-magnesium ore. These ores must have high purity and low impurity content. Additionally, auxiliary materials like soda ash and Glauber's salt are added to adjust the chemical composition and melting properties of the glass.  Chengdu Changyuan Shun industrial Co., Ltd. always choose the best material for glass fiber.  (more detail: www.cysglassfiber.com)

- Raw Material Processing: The selected ore materials are crushed and ground into powder or granular form with appropriate particle sizes to facilitate subsequent mixing and melting. Precise measurement and mixing of the raw materials are carried out to ensure the proportions meet the formula requirements.

Melting

- Feeding into the Furnace: The pre-processed and uniformly mixed raw materials are fed into a glass furnace. Common furnaces include tank furnaces and crucible furnaces.

- High-Temperature Melting: In the furnace, the raw materials gradually melt at temperatures between 1500°C and 1600°C, forming a uniform, bubble-free glass melt. During the melting process, parameters such as temperature and atmosphere must be strictly controlled to ensure the quality of the glass melt.

Forming

- Bushing Drawing: The molten glass flows through a feeder into a bushing, which is a metal plate with numerous small holes. Under the influence of gravity and surface tension, the glass flows out of the holes, forming multiple fine streams of glass. These streams are drawn into single filaments with diameters ranging from a few micrometers to several tens of micrometers under high-speed stretching.

- Bundling into Yarn: The single filaments drawn from the bushing pass through a sizing applicator, where they are coated with a specially formulated sizing agent to protect the fiber surface, improve bundling, and enhance adhesion to resins. These filaments are then gathered together by a guide device to form glass fiber strands or yarn bundles.

Post-Processing

- Chopping or Yarn Processing: Depending on the application, the glass fiber strands are further processed. For chopped fibers, the strands are cut into short fibers of a specific length. For glass fiber fabrics, the strands are warped, woven, or otherwise processed to produce various types of glass fiber yarns, fabrics, and tapes.

- Surface Treatment: To improve the compatibility and bonding strength between glass fibers and matrix materials (e.g., resins), surface treatment is often required. A common method involves treating the fiber surface with chemical agents such as silane coupling agents to form a chemically bonded interfacial layer.

- Drying: The glass fiber products, after surface treatment or chopping, are dried to remove moisture and organic solvents, ensuring the products meet the required moisture content and performance standards.

- Packaging: The dried glass fiber products are packaged according to different specifications and types, typically using plastic woven bags or cardboard boxes, to facilitate storage, transportation, and use.

Throughout the fiberglass production process, quality inspection is conducted at every stage. Raw materials, glass melt, formed fibers, and final products are tested for various performance indicators, such as fiber diameter, strength, moisture content, and oil content, to ensure the products meet standards and customer requirements.