The main purpose of glass fiber
Winding with roving winding method used to create a variety of caliber glass pipe, tanks and so on. The number of twistless rovings used is from 1200 to 9600, and the large pipes and tanks are mostly inclined to direct roving, such as 4800tex direct roving. The requirements for twisting roving are as follows: ① into a good band, was flat belt; ② twist roving easy to solve, from the bobbin when not off the ring, do not form a nest-like silk; Uniform, no drape phenomenon; ④ linear density uniformity, generally less than ± 7%; ⑤ roving permeability of good, from the resin tank through the resin when easy to wet and soaked.
The roving used for glass fiber reinforced plastic for jetting is required to have the following properties: (1) good cutting property, and less static electricity during continuous high-speed cutting; (2) the efficiency of dispersing the raw yarn after twisting the roving , That is, the beam splitting rate is high, usually require more than 90%; ③ chopped after the original wire with excellent cover, can cover the mold in every corner; ④ resin soaked fast, easy to roll flat and easy to drive bubbles ; ⑤ original barrel to improve the performance of good, coarse yarn density uniformity, suitable for a variety of spray gun and fiber delivery system. Spraying with roving is made of multi-stranded wire system, each strand contains 200 glass fiber monofilament.
The roving is made of parallel raw wire or parallel monofilament. Twistless roving according to the glass composition can be divided into: alkali-free glass roving and alkali glass roving. Production of glass roving used glass fiber diameter from 12 ~ 23μm. The number of roving rovings is from 150 to 9600 (tex). The roving can be used directly in some composite material forming methods, such as winding and pultrusion processes, which can also be woven into a roving fabric because of their uniform tension and further chopped rovings for some applications The
Pultruded with roving shrinkage for the manufacture of cross-section consistent with the various profiles, which is characterized by high glass fiber content, one-way strength. Pultruded roving can be multi-stranded wire can also be a direct twist roving, the linear density range of 1100 to 4400. A variety of performance requirements and winding twist roving roughly the same.
SMC with roving SMC that is chip molding compound, mainly used to suppress the car parts, bathtub, water tank board, purification tank, all kinds of seats and so on. SMC with roving in the manufacture of SMC sheet to cut into lin (25mm) length, dispersed in the resin paste, so the requirements of the roving for SMC with twist is good, less hair, antistatic excellent , The chopped wire does not adhere to the knife roll during cutting. For colored SMC, the roving is impregnated with resin in a high pigment content resin paste. Usually SMC roving is generally 2400tex, a few cases also useful 4800tex.
