Fiberglass can be divided into alkali-free fiber, medium-alkali fiber,high-alkali fiber, special glass fiber, etc. according to the alkali content in its composition. The first three kinds of fibers are commonly used in wet-laid felt. alkali-free glass fiber is suitable for epoxy copper clad laminates and electrical insulation products; medium-alkali glass fiber is suitable for continuous machine operation or hand lay-up to make sheets, pipes, tanks, cruise ships,bathtubs and other products; high-alkali glass fiber is suitable for battery separators Sheets, roofwaterproofing materials, etc. Glass fiber has high heat resistance, and its softening temperature is 550~750℃. At the same time, it has good electrical insulation properties and dielectric properties, and can be used as various insulating materials, radomes, etc, and because glass fiber has excellent sound insulation and sound absorption properties, its products can be used in various acoustic equipment. Since glass fiber is a brittle material, the elongation at break is very small, so its flexibility is small or brittle.
Production Process Of Wet-laid Fiberglass Thin Tissue
The manufacturing process of fiberglass wetlaid tissue is similar to that of papermaking. The main production process is as follows: the glass fiber chopped strands are added to the fiber silo by the feeding elevator, sent to the belt scale by the feeding roller and the belt conveyor, and then added to the mixing tank after continuous weighing, stirring and dispersing together with white water. , to make a uniformly dispersed slurry of a specific concentration. The stock is continuously fed into the sizing circulation system by a metering pump, and the stock is further diluted and pumped from the headbox to the headbox.
The fiber pulp is formed into a thin felt on the inclined wire paper machine. Most of the white water in the pulp is naturally dehydrated through the dehydration box and returned to the white water tank. The excess water in the thin felt is forcedly dehydrated by the suction fan, and the removed water is returned to the white water tank. , the thin felt is sent to the impregnation machine.
The white water in the white pool is returned to the mixing tank by the return pump, mixed with the newly added dispersant, thickener and defoamer to disperse the newly added glass fiber filaments, and the white water is recycled.
The formed thin felt is introduced into the impregnating machine, and is saturated with the binder on the impregnating machine. The excess binder is removed by the suction box, separated by the separation tank, and returned to the binder circulation system.
The impregnated thin felt is introduced to the conveyor belt of the drying and curing furnace. In the drying and curing furnace of hot air circulation, the moisture in the felt is evaporated, the binder is cured, and the glass fiber felt has a specific function.
Before coiling, the dried and cured felt is automatically detected by the radioactive detection system to detect the gram weight and binder content of the thin felt, and automatically adjust it through the control system.
After the detected thin felt is longitudinally cut off the burrs, it is wound into a cylindrical shape by a double-station winder. The winder has two reels with automatic reel change. The rolled felt is the finished product after passing the inspection.
The gram weight of the wet-laid felt ranges from 20 to 280 g/m2, and the width of the wet-laid felt can reach 5.2 m. mm) in parallel with continuous glass fiber yarn to make a reinforced felt.
Advantages of Wet-laid Fiberglass ThinTissue
The performance characteristics of glass fiber wet-laid felt are related to the composition of the glass fiber used and the bonding type of the binder used, generally urea-formaldehyde resin, phenolic resin, polyvinyl acetate, polyvinyl alcohol, and acrylate binder. For special purposes, water repellents, flame retardants and pigments can be added. Its main functions include: high strength, corrosion resistance, light weight, good dimensional stability, good penetration, fire resistance, mildew resistance, and good bonding performance with resin and asphalt.
“Application and development of glass fiber wet-laid felt in China”