Analysis of Surface Strain of a Paper in a Nip Roller Mechanics with a Rubber-layered Roller and a Steel Roller

Abstract

This paper describes experimental studies of surface strain of a paper in a nip roller mechanics with a rubber-layered roller and a steel roller. It is important to investigate the strain of the paper surface in a nip roller mechanics for a precise prediction of the paper transport characteristics because the paper transportation of the nip roller mechanics depends on the strain of paper surface as well as the rubber deformation. First, an experimental setup of a nip roller mechanics with two short steel rollers was prepared. The velocity ratio between two steel rollers and that between the steel roller and the paper were measured for various normal forces. It was shown from experimental results that the in-plain paper deformation due to the normal force is vanishingly small. Next, an experimental setup of a nip roller mechanics with a short rubber-layered roller and a short steel roller was prepared. The velocity ratio between the rubber and steel rollers and that between the rubber roller and the paper were measured for various normal forces. Experimental reults demonstrated that the strain of paper surface greatly depends on the normal force. Moreover, by comparing the experimental results for two different rubber hardness, it was concluded that the strain of paper surface depends only on the nip width. Our shearing deformation model can describe experimental results well.