This is pu castor to open the market

This is high quality pu castor to open the market, with rolling roller friction with sandpaper sole to detect shoes wear resistance test method. Difference between them: first of all instruments, NBS abrasion tester/DIN abrasion tester sampling size to differ, 1 in length. Square / 16 mm diameter circular specimens and NBS is 0 in the roller wear. 1。 The thickness of the need to revolution and standard material abrasion 0. 1。 Need the percentage of revolution. High quality universal wheel, on the roof rotates, every ball should be able to and steel runway surface contact, rotation smooth, no obvious resistance phenomenon. Industrial castor wheels in turns, should be flexible rotation, no obvious jumping up and down. After people invented the wheel, moving and moving object is a lot easier, but can only be run on a straight line, wheel for moving heavy objects to the direction of the change is still very difficult, then people invented with a steering wheel structure, that is what we call castor or universal wheel. Castor appeared to people carrying brought epoch-making revolution especially the moving object, not only can easily carry, can also with any direction, greatly improving the efficiency. / news_80。