For better estimation of GFRP properties, the authors made some experimental studies about tensile properties of glass fiber tow according to corresponding Chinese national test standards.

The factors affecting the crimpability of PAN staple fiber include the overall denier of tows, crimp box height, crimping pressure and temperature, tow tension and width and heat setting temperature.

The reason causing black fiber during tow passing by the rotary side plate of a crimping machine was analyzed for ES composite staple fiber.