Devolatilization is a key step in polymer processing. Low-molecularweight components are removed from a polymeric system. The transport of these components takes place by diffusion to the polymer-vapor interface. This interface can be formed by free surfaces of single-phase polymer melts or by bubbles. In this study the transport with and without bubble nucleation is investigated independently from each other in a specially designed apparatus. The mass transport in thin films and in rotating pools with surface renewal is measured. High surface renewal rates and thick films enhance the mass transfer for single phase flow. For two phase flow and devolatilization the conditions for bubble nucleation and foam formation are investigated. The bubble nucleation is observed in the rotating pool in the area of high shear velocity.
Learning to see" is the message of the powerful Value Stream Mapping (VSM) technique, which was developed within the lean production paradigm to help practitioners redesign production systems, eliminate waste and create continuous flow manufacturing in a high-mix, low-volume manufacturing environment. It was originally developed mainly for disconnected flow lines of the automotive industry. In this contribution, both the adaption of this method to the characteristics of semiconductor manufacturing and its application in a Wafertest environment at Infineon Technologies, an important frontend site for microcontroller manufacturing, are shown. The article provides guidelines on how to implement continuous flow manufacturing into typical semiconductor production areas. The advantages of this production principle, as well as the special expenditures during the implementation, are demonstrated.
Value Stream Design; continuous flow manufacturing;Wafertest; high-mix, low-volume, job shop; semiconductor industry
The study seeks to fulfil the ultimate step of the previous researches on demand chain concepts within manufacturing environments, with a specific focus on sustainability criteria. In this case, New Product Development (NPD), Industry 4.0 and smart manufacturing act as effective tools towards production of updated products facilitating both business survivability and customer satisfaction. This paper utilizes a brief overview of the literature studies as a knowledge platform and further investigates the case of two German manufacturing companies using a mixed research method. The outcomes and findings will then be analyzed to examine the study hypothesis towards creation of a comprehensive conceptual framework defining interconnections between NPD and Sustainable Demand Chain Management (SDCM) within global manufacturing domain. The novelty of this research is to develop the results of previous stages of this study including comparison of practices within several manufacturing companies in terms of the linkage between SDCM and NPD projects. This will be completed by creation of the main conceptual framework of this study introducing the new concept called sustainable demand-driven product development (SDPD).
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