Hot embossing of microstructures: characterization of friction during demolding

Abstract

Today, hot embossing and injection molding belong to the established plastic molding processes in microengineering. Based on experimental findings, a variety of microstructures have been replicated so far using the above processes. However, with increasing requirements regarding the embossing surface and the simultaneous decrease of the structure size down into the nanorange, increasing know--how is needed to adapt hot embossing to industrial standards. To reach this objective, a GermanCanadian cooperation project has been launched to study hot embossing theoretically by a process simulation and experimentally. The present publication shall report about an important aspect--the determination of friction during the demolding of microstructures.

A Structured Review and Classification of Demolding Issues and Proven Solutions

“…It is governed by the elastic or viscoelastic properties of the polymer, the relative velocity of the surfaces (the demolding rate), and also the overall pressure distribution. Worgull et al (2008a) have published results of simulated replication trials where various demolding rates were studied. Static coefficients of friction at 1 mm/min were substantially higher than those at 5 mm/min.…”

Effect of Molding Conditions on Demolding Force During Injection Molding of Parts with Micro-features

“…또한 측벽의 표면 거칠기에 따라 이형력에 차이가 있음이 연구되었다 [2] . Yuhua Guo [3,4] 은 ABAQUS/Standard을 사용하여 Hot embossing 공정에서 금형과 polymer의 수축차이로 인한 열응력에 대하여 연 .…”

Demoulding Force Prediction for Micro Polymer Replication: A Review of Relevant Literature

“…Worgull et al [6,28] observed that demoulding forces may vary by several factors depending on the process parameters selected and the quality of the tool. A test apparatus which can be used in a tensile testing machine was described and results presented based on varying parameters.…”