Abstract
A new tester to measure micro shearing slippage of the tape is developed, in which an LVDT is used to measure the slippage at 1 or 0.1 μm a digit. By the tester not only the slippage under the application of shearing force but also the recovering slippage after the force is removed can be measured. Shearing and recovering slippage of a polyester tape coated with adhesive of polyacrilic acidester is measured under the following conditions : 0.98 N {100 gf} in shearing force, 0, 20, 40 and 60 min in leaving time, 30 min both in loading and recovering time, and 23 ± 0.5°C and 65 ± 5% RH in atmospheric condition. The results of the experiments and the analyses are concluded briefly as followes : (1) Combination of two Voigt units is effectively adapted for both of the cohesive and boundary slip. (2) The coefficients of the Voigt units in cohesive slip are kept constant throughout the applied leaving time. (3) The coefficients of the Voigt units of boundary slip in short leaving time show higher transient effect and larger terminal velocity of slip, but in the leaving time of 40 min little transient effect is observed, and in the leaving time of 60 min no boundary slip is recognized.
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