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Hot Embossing by Matthias Worgull

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3.3.1. Shear Rheologic Behavior

3.3.1.1. Stationary Flow

In most replication processes polymer melts undergo shear deformation. Shear results from adhesion on the sidewalls of the flow channels during low flow velocities. Because of the high viscosity of polymer melts, the Reynolds number is small, so that in typical replication process conditions a laminar flow can be assumed.

To describe shear deformation the well-known Newtonian model can be used (Fig. 3.2). The model consists of a fluid between two plates. One of the plates can be moved horizontally with constant velocity. Because of the motion of one plate against the other plate, the fluidic layers can glide on each other. The melt will be sheared. The mathematical description can be ...

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