This report compares the four different 3M industrial rolls with two other nonwoven industrial rolls - a United Rotary Brush roll made with Freudenberg C 1912 web and a Toho roll which we believe is their PC-67 web. Both of the competitive webs are made with nylon fiber like the 3M Neutral and RK rolls. The 3M Acid and Type C rolls are made with polypropylene fiber.

The first comparison is of the tensile strength of web before it is made into a roll. Tensile strength has long been viewed as a good initial indicator of how the roll will perform. However, at the same time, we look for differences of at least 15% due to the random nature of nonwoven webs. The tensile strength values are given for dry web and wet web because the strength does not change with water saturation and because various applications use rolls either wet or dry.

The second comparison is of the coefficient of friction between the roll surface and various metals. The rolls were tested dry, wet with water and wet with oil. Friction values were measured with carbon steel, stainless steel, aluminum, copper and nickel.

The third comparison is of the roll's performance as a wringer roll, how the roll responds to a specific roll damage routine which simulates a "line wreck" and how the wringing performance improves as the roll heals itself after the damage. This test is run with hot water and the comparative data is the weight of the water carried out of the nip.

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