Influence of Process Temperatures on Blister Creation in Micro Film Insert Molding of a Dual Layer Membrane

Abstract

In this work the suitability of a dual layer membrane, consisting of a non-woven Polypropylene (PP) support and a membrane layer made out of Polyethylene Terephthalate (PET) for Micro Film Insert Molding (μFIM) was investigated. The emergence of blisters at the surface of the PET-membrane layer was observed for some combinations of the process parameters used in this investigation. Since these blisters are not only an optical issue but can also deteriorate the functionality of the membrane, a blister free overmoulding of the membrane is required. In particular the mold and the barrel temperature were found to influence this blister creation. The influence of these two parameters on the amount of blisters and the blister height, characterized by the areal surface topography parameters peak material portion (Smr1) and reduced peak height (Spk), is presented in this paper.

Microinjection moulded polyetheretherketone biomaterials as spinal implants: physico-chemical and mechanical characterisation

“…To improve part quality, process interrogation techniques have been implemented that can provide rich data sets describing the material storage, pre-processing steps (drying, handling), plastication, injection, cooling and post process properties (shape, mechanical properties, optical properties etc) [17]. To verify the repeatability, accuracy and precision of the injection moulding process, measurements were performed on three areas of the sample using an Olympus LEXT OLS 4000, objective lens 5x.…”