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.

The SPE Library is just one of the great benefits of being an SPE member! Are you taking advantage of all of your SPE Benefits?

Not an SPE member? Join today!

Use % to separate multiple keywords. 

Search SPE Library
After Date: (mm/dd/yy)  
Sort By:   Date Added  ▼  |  Publication Date  ▼  |  Title  ▼  |  Author  ▼
= Members Only
Conference Proceedings
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.
Characterization of iPP-PDMS Elastomers
Polina R. Ware, Alan J. Lesser, May 2013
An isotactic polypropylene-polydimethylsiloxane (iPP-PDMS) elastomer was prepared by reactive extrusion with tert-butyl peroxide. Rheology and thermomechanical analyzer (TMA) experiments demonstrate typical elastomeric behavior. Two complimentary techniques TMA and differential scanning calorimetry (DSC) were combined to estimate the density of iPP in the crystalline phase and to calculate the volume change associated with melting and crystallization thermal transitions. Further, the analysis confirmed the presence of crystalline iPP and amorphous PDMS phases in the elastomer
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.
Supercritical CO2 Improving Compatibilization of PP/PS Blend in Continuous Extrusion
Guoying Ji, Wentao Zhai, Wenge Zheng, May 2013
Supercritical carbon dioxide (scCO2) was used in extrusion for the improvement of polymer blend properties. The compounding took place in two-single screw extruder. The morphologies of prepared blends were compared. Carbon dioxide was added at 3, 5wt% based on polymer melt flow rates. The experimental results indicate that the viscosity of PP and PS blends were reduced obviously and a sharp decrease in the size of the dispersed phase was observed. The impact strength of press molded 80/20 polypropylene /polystyrene blends increase by the addition of CO2.
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.
Reliability of Weld Join Under Fatigue Conditions
Haiying Zhang, Zhenwen Zhou, May 2013
This paper focuses on reliability of glass-reinforced polyamide (PA) vibration welded joints with respect to fatigue. It presents a statistical extension of the thermodynamic model of lifetime under creep into reliability model under creep and fatigue. The paper also presents in detail a method of obtaining Weibull distribution parameters employed in the model. The proposed reliability analysis can be easily implemented for weld joint design.
Processing and Characterization of High Speed Extruder for Nanocomposite Formulations
Jacob J. Boone, Gregory Pigeon, Christopher Thellen, Jo Ann Ratto, Robert Whitehouse, May 2013
Ethylene Co-Vinyl-Alcohol (EVOH) blends were compounded on a high speed extruder, with kaolinite loading levels at 0, 3.0, and 7.5%. Extruded samples were processed with varying screw speeds (0 to 3000rpm) and feeder rates, and then characterized for dispersion, thermal, and mechanical properties.
Modeling polyurethane foam flow in a mold with constricted vents
Krishnamurthy Jayaraman, Christopher J. Hershey, James T. McEvoy, May 2013
A computational flow model has been developed that accounts for the volume expansion and viscosity behavior of thermosetting polyurethane foam with water as the blowing agent in pour molding of polyurethane foam. This model was then used to investigate the effects of (a) varying pour distribution and (b) restricted air flow through vents on the merging of expanding flow fronts and air pocket formation in a vented rectangular mold cavity with a rigid rectangular insert.
Basic Day-Night Laser Ablation
Jacob Wieloch, May 2013
Lasers have been used for over 10 years to ablate paint layers in day-night applications. Over this time, there has been a lot of confusion over how laser systems are set up to perform this application. This paper will address different variables that effect how lasers interact with paint and why each variable is important to the process.
Study on the Effect of Material Elasticity on Acoustic Performance and Rheological Properties of Bio-Based PLA and PHA Blend Foams
Shahrzad Ghaffari Mosanenzadeh, Hani Naguib, Chul Park, Noureddine Atalla, May 2013
In this study, open cell foams were fabricated from blends of bio-based polymers to be used as sound absorbers. Different blends of Polylactide (PLA) with two grades of Polyhydroxyalkanoates (PHA) where foamed and characterized based on acoustic and mechanical performance. Rheological properties of pure polymers as well as their blends were studied to investigate the effect of material elasticity on the acoustic absorption of the resulting foams.
Lead-Free, Low Smoke Zero Halogen LV Power Cable Jacket
Jason Zhang, May 2013
A new lead-free, low smoke zero halogen (LSZH) low voltage power cable jacket compound was developed based on customer requirements. This jacket was formulated based mainly on an ethylene co-polymer matrix with magnesium hydroxide and other inert inorganic fillers to improve and optimize overall performance. The new jacket shows enhanced dielectric and flame retardant performance with much lower smoke release while maintaining comparable mechanical properties to previous (lead-containing) formulations.
Characterization of CNT Orientation and Diameter Distribution in CNT/Polymer Composites by Image Analysis
Md A. Bhuiyan, Raghuram V. Pucha, Kyriaki Kalaitzidou, May 2013
The focus of this research is to determine the distribution function of CNT characteristics such as orientation and diameter of CNT within the polymer matrix and investigate how these characteristics affect the tensile modulus of the CNT/ polypropylene (PP) composites. An image analysis approach combining scanning electron microscopy (SEM) and a selective etching technique allows for extraction of 3D information that is used as input in a finite element model.

This item is only available to members

Click here to log in

If you are not currently a member,
you can click here to fill out a member application.

We're sorry, but your current web site security status does not grant you access to the resource you are attempting to view.

  Welcome Page

How to reference articles from the SPE Library:

Any article that is cited in another manuscript or other work is required to use the correct reference style. Below is an example of the reference style for SPE articles:

Brown, H. L. and Jones, D. H. 2016, May.
"Insert title of paper here in quotes,"
ANTEC 2016 - Indianapolis, Indiana, USA May 23-25, 2016. [On-line].
Society of Plastics Engineers
Available: www.4spe.org.

Note: if there are more than three authors you may use the first author's name and et al. EG Brown, H. L. et al.

If you need help with citations, visit www.citationmachine.net