New process technology for high volume production of composites

2011 ◽  
Vol 31 (1) ◽  
Author(s):  
Walter Michaeli ◽  
Jan Wessels ◽  
Marco Pöhler ◽  
Lionel Winkelmann
Keyword(s):  
High Performance ◽  
High Volume ◽  
Fibre Volume ◽  
Reinforced Composites ◽  
Process Technology ◽  
Compression Moulding ◽  
New Process ◽  
High Volume Production ◽  
Volume Production ◽  
Fibre Reinforced Composites

Abstract Despite their outstanding properties, the use of composites is still limited. The absence of an appropriate and economic high volume production technology is the most important restriction for the use of composites. This paper presents results of the research on new high volume production chains for continuous fibre reinforced composites which are based on the separation and parallelisation of the process steps “impregnation” and “forming and curing”. Two new impregnation processes for polyurethane and epoxy resin as well as a new compression moulding technology are introduced. The production of high performance parts with a fibre volume content higher than 50% in a cycle time below 10 min is described and analyses of the impregnation quality and the mechanical properties of the parts are presented.

FINDING DICING PLANS FOR MULTIPLE PROJECT WAFERS FABRICATED WITH SHUTTLE MASK

2008 ◽  
Vol 17 (01) ◽  
pp. 15-31
Author(s):  
MENG-CHIOU WU ◽  
RUNG-BIN LIN
Keyword(s):  
High Volume ◽  
Industrial Test ◽  
Test Cases ◽  
Process Technology ◽  
High Volume Production ◽  
Linear Programming Formulation ◽  
Chip Fabrication ◽  
Volume Production ◽  
Integer Linear Programming Formulation ◽  
Comprehensive Study

Multiple project wafers (MPWs) containing different chip designs from many customers serves as an important vehicle for gaining access to advanced semiconductor process technology for prototyping innovative designs or low-volume production. In this paper, a comprehensive study on the methods for determining dicing plans for MPW was carried out. Dicing plans can be used to determine the number of MPWs needed to be fabricated before chip fabrication and employed to saw the wafers after fabrication. Several methods based on integer linear programming formulation and a heuristic based on simulated annealing was proposed. Through conducting experiments with industrial test cases, these proposed methods can achieve up to 50% wafer reduction in some cases and on average 18% and 38% reduction for low- and high-volume production, respectively. This study makes a contribution to MPW dicing and is also instrumental in developing better reticle floorplanning methods.

HRM and Contemporary Manufacturing

2009 ◽  
Author(s):  
Rick Delbridge
Keyword(s):  
Lean Manufacturing ◽  
High Performance ◽  
Management Practices ◽  
Value Added ◽  
High Volume ◽  
Manufacturing Sectors ◽  
High Volume Production ◽  
Volume Production ◽  
Incremental Improvement ◽  
High Performance Work System

This article outlines the key elements of organization and HRM associated with contemporary high-volume production, in particular the key arguments and characteristics of lean manufacturing. Lean manufacturing and the associated high-performance work system model has been influential in the development of management practices throughout manufacturing sectors and beyond. However, they are primarily premised on labor efficiencies and incremental improvement. The article reviews the evidence on the implementation and outcomes of lean adoption. The second main section reviews alternatives to ‘lean’. The requirement for innovation and higher value added noted above has meant that a greater emphasis on creating and managing knowledge than that associated with lean manufacturing has become central. One insightful, and increasingly influential, way of conceiving of this challenge has been developed from the concept of ‘communities of practice’, i.e. groups of largely autonomous and self-organizing experts.

Towards a Manufacturing Technology for High-Volume Production of Composite Components

1992 ◽  
Vol 206 (2) ◽  
pp. 77-91 ◽  
Author(s):  
C D Rudd ◽  
K N Kendall
Keyword(s):  
Cost Effective ◽  
High Volume ◽  
Process Technology ◽  
Reinforced Composite ◽  
High Volume Production ◽  
Volume Production ◽  
The University ◽  
Design And Manufacture ◽  
Transfer Moulding ◽  
The Relationship

The last decade has seen strong interest from high-volume manufacturers such as the automotive industry in the development of processes which provide cost effective routes to the manufacture of components in fibre-reinforced composite materials. This paper considers one family of processes that have been targeted as offering a solution—that of resin transfer moulding (RTM)—and reviews the findings of work based at the University of Nottingham. The mechanisms involved are examined together with the variants on the basic process and the implications for high-volume production. Consideration is given to process technology, materials and the relationship between design and manufacture. A route to high-volume manufacture based upon computer aided engineering is proposed.

scholarly journals Quasi-Isotropic and Pseudo-Ductile Highly Aligned Discontinuous Fibre Composites Manufactured with the HiPerDiF (High Performance Discontinuous Fibre) Technology

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1794 ◽  
Author(s):  
M. L. Longana ◽  
H. Yu ◽  
J. Lee ◽  
T. R. Pozegic ◽  
S. Huntley ◽  
...  
Keyword(s):  
High Performance ◽  
High Volume ◽  
Tensile Behaviour ◽  
Reinforced Composites ◽  
Specific Strength ◽  
Fibre Composites ◽  
Different Types ◽  
Recycled Composites ◽  
First Time ◽  
Fibre Reinforced Composites

Conventional composite materials reinforced with continuous fibres display high specific strength but have a number of drawbacks including: the elastic-brittle behaviour, difficulties in producing defect-free components of complex shape with high-volume automated manufacturing processes, and inherent lack of recyclability. Highly aligned, discontinuous fibre-reinforced composites (ADFRCs) are truly beneficial for mass production applications, with the potential to offer better formability and comparable mechanical properties with continuous fibre-reinforced composites. In previous publications, the High Performance Discontinuous Fibre (HiPerDiF) technology has been shown to offer the possibility to intimately hybridise different types of fibres, to achieve pseudo-ductile tensile behaviour, and remanufacture reclaimed fibres into high-performance recycled composites. However, to date, the work has been conducted with unidirectional (UD) laminates, which is of limited interest in engineering applications with mechanical stresses acting across many directions; this paper reports, for the first time, the mechanical behaviour of quasi-isotropic (QI) ADFRCs. When compared with randomly-oriented discontinuous fibre composites (RODFRCs), QI ADFRCs offer enhanced stiffness (+26%) and strength (+77%) with higher consistency, i.e., a reduction of the coefficient of variance from the 25% of RODFRCs to the 6% of ADFRCs. Furthermore, hybrid QI ADFRCs retain the pseudo-ductility tensile behaviour previously observed in unidirectional (UD) lay-up.

scholarly journals Congener-specific partition properties of chlorinated paraffins evaluated with COSMOtherm and gas chromatographic retention indices

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jort Hammer ◽  
Hidenori Matsukami ◽  
Satoshi Endo
Keyword(s):  
Chemical Properties ◽  
High Volume ◽  
Retention Indices ◽  
Chromatographic Retention ◽  
Linear Free Energy Relationship ◽  
Linear Free Energy ◽  
Chlorinated Paraffins ◽  
Gas Chromatographic Retention Indices ◽  
High Volume Production ◽  
Volume Production

AbstractChlorinated Paraffins (CPs) are high volume production chemicals and have been found in various organisms including humans and in environmental samples from remote regions. It is thus of great importance to understand the physical–chemical properties of CPs. In this study, gas chromatographic (GC) retention indexes (RIs) of 25 CP congeners were measured on various polar and nonpolar columns to investigate the relationships between the molecular structure and the partition properties. Retention measurements show that analytical standards of individual CPs often contain several stereoisomers. RI values show that chlorination pattern have a large influence on the polarity of CPs. Single Cl substitutions (–CHCl–, –CH2Cl) generally increase polarity of CPs. However, many consecutive –CHCl– units (e.g., 1,2,3,4,5,6-C11Cl6) increase polarity less than expected from the total number of –CHCl– units. Polyparameter linear free energy relationship descriptors show that polarity difference between CP congeners can be explained by the H-bond donating properties of CPs. RI values of CP congeners were predicted using the quantum chemically based prediction tool COSMOthermX. Predicted RI values correlate well with the experimental data (R2, 0.975–0.995), indicating that COSMOthermX can be used to accurately predict the retention of CP congeners on GC columns.

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