This video explains Synthetic fibers or fibres are the result of extensive research by scientists to improve on naturally occurring animal and plant fibers. In general, synthetic fibers are created by forcing, usually through extrusion, fiber forming materials through holes (called spinnerets) into the air and water forming a thread.

ที่มา : http://www.7active.in

ลิงค์ : http://youtu.be/QFh9I99oVdo

อัพโหลดโดย : 7activestudio