SPE Library
The SPE Library contains thousands of papers, presentations, journal briefs and recorded webinars from the best minds in the Plastics Industry. Spanning almost two decades, this collection of published research and development work in polymer science and plastics technology is a wealth of knowledge and information for anyone involved in plastics.
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Conference Proceedings
Thermal Aspects of PTFE Sintering
Ranadip Ganguly, Alan Lesser, May 2013
The effect of sintering time on the melt evolution of PTFE was studied using a cyclic thermal loading profile within a differential scanning calorimeter (DSC) and thermo-mechanical analyzer (TMA). PTFE exhibited non-equilibrium melt behavior at 30 °C above its melting temperature. A correlation between the DSC and TMA results was established. The cyclic thermal profile leads to a dramatic growth in enthalpy of crystallization/melting.
A Structure-Property Study of Topologically Heterogeneous Networks
Zhan H. Yang, Alan J. Lesser, Fred Pfaff, May 2013
This work is an initial evaluation of structure-property relationships that result from introducing topological heterogeneity into controlled epoxy networks. The topology was controlled by systematically altering the functionality and stiffness of epoxides and amines. This contribution reviews synthetic routes and summarizes basic thermal and mechanical properties.
Melt Rheological Characterization of Poly(Ethylene Terephthalate)
Tzu-chia (Erica) Tseng, Jay Hanan, May 2013
Dynamic melt rheology was used to characterize poly(ethylene terephthalate) (PET) supplied from manufactures across the globe. The zero shear viscosity and the molecular weight of the polymers were determined. This rheology method is more sensitive than traditional intrinsic viscosity measurements provided by the resin suppliers
Modeling and Analysis of Spin Coating on Spherical Surfaces
Xudong Fang, Donggang Yao, Hao Zhang, Allen Yi, May 2013
A formulation for modeling the spinning coating process on spherical surfaces is presented in this paper. The model can be adopted to predict film thickness profile on spherical surfaces with large central angles. The simulation results showed that the uniformity of final film thickness is not ideal with uniform initial film thickness distribution. The film thickness evolution and uniformity of film thickness were studied using this model and compared with literature to determine potential advantages of the new model.
Potential for efficiency improvements at different injection molding machines
Marco Lenzen, Felix Heinzler, Tim Heumann, Alexander Backsmann, Johannes Wortberg, May 2013
Topic of this paper are the results of some investigations discovering potentials for improvements of two different injection molding machines with respect to the efficiency. During this investigations, the influence of process conditions on the energy consumption of two different driven injection molding machines have been focused. Finally some recommendations will be done for an improvement of the efficiency of the machines.
Laser Direct Structuring LCP for Mobile Antenna Applications
Paul Yung, May 2013
The rapid growth and global demand for wireless communication and increasing need for more functionality in smart phones have created a need for advanced engineering resin to meet new antenna requirements for mobile devices. This paper discusses performance of new laser direct structuring LCP grades and developmental grades with improved mechanical, thermal properties and dielectric properties engineered to meet new challenges of increased functionality and reduction in antenna size.
Modeling of Single Ply Thermoplastic Polyolefin Roofing
Jeremy Payne, Herman Nied, Li-Ying T. Yang, May 2013
A finite element simulation is developed to model the stress distribution of heat seamed Single Ply thermoplastic polyolefin (TPO) composite under FM wind uplift test conditions. Separate models are developed for the TPO layers, reinforcement layer, and lap-joint geometry in order to obtain an integrated TPO composite model. TPO membrane material and attachment parameters are evaluated for wind uplift enhancement. Good correlation is observed between model prediction and real wind uplift test results.
Resin Design for High Stiffness and High ESCR Performance in Rotational Molding Applications
Celine Bellehumeur, Tracy Li, Mark Hoidas, Yves Lacombe, Henry Hay, May 2013
This paper presents new developments in the design of ethylene copolymers for rotational molding applications with higher stiffness and ESCR requirements. The performance of novel ethylene copolymers is discussed based on phenomena fundamental to the rotomolding process and on the relative impact of the choice of comonomer, manufacturing technologies and resin design strategy.
Relating Polymer Viscoelastic Properties to Thermoforming Process: A Short Review
Rabeh Elleithy, May 2013
This paper reviews the relation between polymer viscoelastic properties and the plug-assist thermoforming process. One of the important attributes of polymers is their macromolecular interaction. Molecular interaction provides enhanced networks of molecules that contribute to minimizing polymer deformation at high temperatures. As a result, sheet sagging will be reduced during thermoforming. Additionally, molecular interaction could enhance the melt strength of the polymer by reducing its molecular mobility.
Upgrading the Capacity of an Existing Extrusion System
Mark A. Spalding, Gregory A. Campbell, May 2013
Several low-cost techniques are readily available to upgrade the capacity of an existing extrusion system. These techniques include upgrading a screw to restore the flight clearance due to wear, changes to the motor drive train system, and the use of high-performance screws. The technique used will depend on the rate limitation and the current process.
Troubleshooting and Mitigating Gels in Polyolefin Film Products
Mark A. Spalding, Eddy Garcia-Meitin, Stephen L. Kodjie, Gregory A. Campbell, May 2013
The term “gel” is commonly used to refer to any small defect that distorts a film product. Eliminating gel defects from extruded polyolefin film products can be difficult, time consuming, and expensive due to the complexity of the problem and the high levels of off specification product produced. This paper discusses the identification of gel types, the common root causes for gels, and the technical solutions for mitigating gels in film products produced using single-screw extruders.
Comparison Study of Talc and Nanosilica as Nucleating Agents for Low-Expansion Foaming Applications
Mo Xu, Anson Wong, Chul B. Park, May 2013
This paper compares the effectiveness of talc and nanosilica as nucleating agents for generating polypropylene foams with high cell density and low expansion. Experiments were conducted in two stages: 1) In-situ foaming observation in a batch system; 2) Extrusion foaming. Nanosilica was more effective than talc in inducing cell nucleation under static conditions. However, in extrusion, their effectiveness in enhancing cell nucleation was similar due to the presence of extensional and shear stresses.
Fiber length and orientation distribution measurement of a charge for D-LFT compression Molding
Camilo Perez, Steffen Roppers, Tim A. Osswald, Umesh Ghandi, Raghuram Mandapati, May 2013
Initial fiber orientation distribution (FOD) and fiber length distribution (FLD) of a fiber glass reinforced polypropylene charge for a D-LFT compression molded part were measured using image processing techniques. The FOD was measured from ?-CT scans using two different image processing approaches. These results are intended to be used in compression molding simulations.
Considerations regarding the EN13900-5:2005 determination by filter pressure value test
Justin Abel, May 2013
With the increasing demands on masterbatches the DIN EN13900-5 standard has been used as a more stringent and objective indicator of dispersion quality in a polymer matrix. Introduced within the last 7 years this method is being widely adopted in the industry. This paper will examine the history and the key components needed to assess the dispersion of a colorant in a masterbatch as well as equipment considerations.
Reliable Damping Parameters for Simulating Flow of High Molecular Weight HDPE
Tieqi Li, Wen Lin, Tracy Li, May 2013
Determination of damping parameters from uniaxial extensional flow data per K-BKZ/PSM model are evaluated for high molecular weight HDPE resins. It was found that the damping properties depend on strain rate. The strain dependence, however, cannot be represented reproducibly as the relaxation mode-dependent ?k per Luo-Tanner from SER data. More efficient description of the strain dependency remains to be further explored.
Laser Transmission Welding for Medical Devices
Kai Holl, Thomas Seul, Udo Behn, Michael Gehde, May 2013
Laser transmission welding is a well established joining technique for molecular diagnostic devices such as lab on a chip. This paper provides an overview about the effects of the injection molding parameters and the joining process parameters on weld strength. Design of experiments was used to maximize the weld strength. Additional optical and microscopic tests are required to validate the process for medical devices.
Die Design Effect on Internal Die Drool Phenomenon
Martin Zatloukal, Jan Musil, May 2013
n this work, the effect of die exit design on the internal die drool phenomenon occuring during extrusion of HDPE has been experimentaly investigated. It has been revealed, that firstly, the effect of flared length and die exit angle on the internal die drool intensity during extrusion of HDPE has non- monotonic character and secondly, flared dies are more stabilizing in comparison with chamfered dies.
Influence of the Endgroup Nature on the Rheological Behavior of Branched Polycarbonate Resins
Jean-Francois Morizur, May 2013
Branched polymer rheology represents a very active field of research with important challenges, both from the scientific and technological point of view. A study of the rheological properties of branched polycarbonate resins is presented. The effect of the endgroup nature on the polymer melt viscosity was investigated.
A New Rheometer Concept Extending the Capabilities of Rotational Rheometer
Jörg Läuger, May 2013
A new rheometer concept based on two air bearing supported motors is introduced. The combination of two motors into one rheometer system offers increased sensitivity and new testing capabilities not possible before. Three completely different testing modes such as combined motor transducer, separate motor transducer and counter rotation are available in one single rheometer system. The aim of the paper is to describe the new technologies involved and to outline applications.
Cavity-Integrated Injection Molded Accoustic Foams
Davoud Jahani, Peter U. Jung, Amir Ameli, Amir Ameli, Chul B. Park, Hani Naguib, May 2013
An injection molding machine enhanced with gas counter-pressure was used to produce cavity integrated acoustic foams using mold opening technique. The cell morphology of the produced foams in different mold opening lengths was studied. An automated perforating system was developed to perforate acoustic foams. Acoustic behavior of the produced foams with and without perforation was studied.
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