aring the eraser in half. With the Z plane you are trying to break inner polymer bonds. WHY DOES KEVLAR ONLY MAKES A SMALL DIFFERENCE WHEN BONDED TO RUBBER? First, bonding a matrix fiber to a elastomer is very expensive. The rubber, wearing away faster than the Kevlar, causes filmnents of Kevlar to fall out, allowing the rubber to wear out reasonably fast. Unless the yarn is a continues string, the fibers will fall out. When doing this, each sole would have to be impregnated separately, making for a much higher price. The impregnation only makes a slight difference in abrasion when compared to rubber alone. Kevlar would be a good choice when used to improve sfiffiess (using a simlar method that is used on tires) After the rubber wears away, one is just left with the cloth that would wear away quickly from abrasion. PROBLEM STATEMENT Through out skatboarding history, many skaters have had to throw out a new pair of sneakers within a month's wear. This rapid disposal is due to abrassion with the grip tape. The grip tape is sand paper like material with an adhisive backing. The grip wears at two specific points rapidly. The two spots being, the ollie area, an area of the shoe that is just behind a person's smallest toe on the outer side of the foot, and the outer sneaker sole. The ollie area is worn away when you do a basic move known as the ollie. When you ollie, the board will first begin to go verticle, then when you slide your foot up the board to begin to move the board horizontly to set your hieght. During the time when a person begins to move the board horizontally they wear away the leather, nylon, rubber, or cotton away a if they were brushing their shoes with sandpaper. Abrasion on the soles is produced from constant movement of the soles with either grip tape or the ground surface. With grip tape and most surfaces suitable for skateboarding being very granular or rough soles tend to wear like an eraser constantly in use, thus ca...
