Page 197 - Handbook of Surface Improvement and Modification

192 The Coefficient of Friction

able silicone resin, a catalyst, at least one lubricating filler not soluble in the coating com-
54
position and optionally a solvent.
Base sheets are disclosed having a reduced coefficient of friction in the wet state. 55
In accordance with the present invention, the base sheets can be treated with a high molec-
ular weight poly(ethylene oxide), a derivatized poly(ethylene oxide) or an acrylate copoly-
55
mer containing polyethylene moieties. The base sheet can be single-ply or multi-ply. 55
The base sheet can be a tissue product, such as a facial tissue, a bath tissue, or a paper
55
55
towel. Alternatively, the base sheet can be a pre-moistened wipe.
There is a critical need for film suppliers and film converters to deliver films and
56
sheets that have a consistent COF throughout the surface of the film and sheet. Presently
there are no suitable solutions for online, or at-line, COF measurements in the film indus-
56
try. The current worldwide procedure is to measure COF on different areas of the film,
56
using a separate off-line procedure. The invention provides an apparatus for the continu-
ous measurement of the dynamic coefficient of friction and/or static coefficient of friction
of a material, which comprises at least the following: two rotating rollers, one roller,
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optionally, one static roller, and two sets of force detectors.
Media having a high coefficient of friction can be troublesome in sheet feeding
57
printer operations because of the tendency of one sheet to stick to another. The coeffi-
cient of friction problem becomes particularly troublesome when a glossy inkjet coating is
57
desired on both sides of the media, in order to support two-sided printing. The invention
utilizes low friction materials in an emulsified form to decrease the coefficient of friction
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of a two-sided inkjet coating. The low friction materials include waxes, simple organic
57
polymers, silicone polymers or fluorinated polymers.
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