Design and fabrication of an adhesion force tester for the injection moulding process

During the injection moulding process, serious adhesion effects can occur at the interface between the specimen and tool surface during ejection, causing distortions or cracks in the samples, especially for resins such as PMMA, PC and TPU. However, ejection force measurement is not able to measure adhesion force accurately for elastomeric resins during the injection moulding process. A tensile mode adhesion force tester was fabricated to measure the adhesion force between the sample and tool surface during the thermoplastic injection moulding process, especially for elastomeric resins, which have adhesion problems that are both serious and difficult to measure. In addition, three different types of TPU are examined, with their temperature and viscosity being the main factors that affect the adhesion force. Engineers can use the measurements obtained in this work to better understand adhesion and work to reduce it.