Relation between Wire Wear and Wire Support Materials in the Paper Machine Wire Part

Abstract

This report shows my survey of the relation between wire support materials which are widely used nowadays and bronze wire wear by thee test device.As test piecesne, I applied high density polyethylene, monomer casting nylon, polyurethane type synthetic rubber, phenolic plastic treated laminated materials, ceramics and etc. which are widely used for wire support equipments as wire suction boxes, foils, wet suction boxes and deflectors, and applied 13 Cr. steel and bronze which are commonly used for rotating wire support equipments as a couch roll etc. and for the purpose of comparison also applied metallic materials-phosphorus bronze, etc.-same material as machine direction wire.Woods and natural rubbers are omitted as already numerous reports were published for these materials.I also measured the coefficients of dynamic friction between bronze wire and wire support materials by dynamic friction measuring device and inspected the relation between such coefficients and wire wear.The relations between wire support materials and wire wear are as per Fig. 8, 9 and dynamic friction is as shown in Fig. 10.Non metallic materials, which are used for stationary wire support equipments, are to be investigated separately in case of wire suction box and of the equipments applied within the forming length. My test result shows that, for the former, polyurethane type synthetic rubber is superior and for the latter ceramics.Between 13 Cr. steel and bronze, which are used for rotating wire rupport equipments (couch rolls), no distinctive difference was detected.For the synthesis of all above test results, I could not find any clear relation between the coefficient of dynamic friction, hardness and wire wear, and I confirmed these problems by method of the dimensional analysis.These test results are made under the comparatively simplified experimental conditions. Therefore, in case of actual operations of paper machine, in which wire runs under the complicated conditions, sprung up by the tangle of mechanical, thermal, chemical and many other factors, these results cannot necessarily be applied as they are. I assume that these results are to be referred in actual design and operation as a basic data for general trends of the relation between each wire support material and bronze wire wear.