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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Effect of Interphase Condition on Mechanical Properties in Polyamide Pre-Impregnated Glass Fiber Reinforced Polypropylene Composite
In order to improve the mechanical properties of glass fiber reinforced polypropylene composite, the polyamide pre-impregnated glass fiber is candidate. The pre-impregnated resin distributed near the glass fiber and it would affect both the fiber length in molding and the interfacial properties. Consequently the tensile strength could be improved.
Effect of Gate Design when Molding Thermoplastic Elastomers
The depth, width and land length of an edge gate were systematically varied in order to assess guidelines for gates used in injection molding of thermoplastic elastomers (TPEs). Each gate design was evaluated using several classes of TPEs and a range of processing conditions.
Clay Nanocomposites in a Combustible Molded Material
Flame retardant compounds are commonly used in industry. In this study, clay nanocomposites will be evaluated for their effectiveness to control combustion. The clay nanocomposites will be incorporated into the resin through injection molding. The effectiveness of the different percentage of nanocomposite will be compared using traditional flame retardant evaluation techniques and their ability to control combustion on the outside of the polymer.
The Effects of Pack Velocity on the Injection Molding Process
With the introduction of electric molding machines and upgraded technology, in molding, an un-developed part of the molding cycle is introduced; this piece of the cycle is known as pack velocity. This study will demonstrate how to set and optimize the pack velocity. The optimization is be evaluated by studying the effects of pack velocity on part weight (density), and part dimensions.
The Effects of a Change in Back Pressure on Polypropylene with Colorant
The strength and viscosity of polypropylene is influenced by extreme stress during the injection process. The extreme stress on the material can be altered by changing the backpressure on the machine. The effects of extreme back pressure on polypropylene with colorant will be determined through tensile and impact testing. Numerous material trials will be conducted to prove the change in strengths.
A Perturbation Method to Characterize Reactive Extrusion
By means of a novel flow perturbation technique, fundamental details of reactive extrusion systems can be analyzed with respect to the chemical reaction rate, effects of catalyst and extrusion conditions, such as throughput and screw speed. A specialized, high-speed data acquisition system, the “Extrusion Pulse Analysis System” (EPAS) has been developed to enable on-line monitoring and data analysis of the imposed disturbances to provide real time diagnosis of extrusion processes in laboratory and manufacturing applications.
INSITE™ Technology - A Polymer Innovation
During the 1990’s and into the 2000’s, Dow has developed, launched and grown a family of products based on INSITE™ technology. This technology platform has and continues to spawn many product families because of its flexibility and its many scientific facets. Key to success is the integration of catalyst innovations, material science innovation, process innovation and application development process innovation into a wide range of products for many markets. The technology concept coined molecular architecture" continues to have wide utility and innovation in the marketplace."
Advanced Technologies for PC-ABS Blends
Polycarbonate (PC)-acrylonitrile-butadiene-styrene terpolymer (ABS) blends continue to be improved to meet increased demands for reduced fabrication cycle time and balance of stiffness, toughness and heat resistance in markets such as automotive. This paper will address the science and technologies required for these blends to maintain their competitiveness and their growth in a global market-place.
EAA Copolymer Coated Metals for Cable Applications
The invention that led to the innovation was the synthesis of a random copolymer of ethylene and acrylic acid (EAA). It was discovered that this copolymer would adhere to metals. The innovation was the commercialization of Zetabon coated metals based on EAA coatings on aluminum or steel for cable shielding and armoring applications. The innovation became the enabling technology for a cable sheath design known as the bonded sheath, or laminate sheath, that is now the global standard for telecommunications cable.
The Novel STT™ Process Application with the Polymer Plant of the Future
This presentation will describe a unique process system called the Spinning-Tube-in-Tube, or STT™, process, which represents a paradigm shift away from the traditional approach to the processing of materials. The patented STT™ process system is a paradigm leap from volume-based to an area-based processing technology. Although applicability of the new STT™ process will be across many market sectors, this presentation will focus on applications within the polymer plant of the future. Several polymer applications will be discussed.
New Developments in Water-Borne Polymer Processes
This paper will highlight areas of promising research in the field of water-borne polymer products. Water-borne polymer products will be taken to mean polymer systems that are either polymerized in an aqueous medium, or applied from an aqueous medium. The talk will be limited to two-phase systems (emulsions, suspensions, etc.), and so water-soluble polymers will not be discussed.
Transient Heat Transfer Coefficients for the Solidification of Blow Molded Parts
We have developed a simplified experimental set-up to measure the transient heat transfer coefficient between a heated polymer sheet and a controlled temperature aluminum plaque. The effect of using non-uniform heat transfer coefficients on the part cooling and solidification is determined for the prediction of the blow molding of an industrial scale part.
FE-Analysis of the Two-Step Stretch Blow Moulding Process
The initial temperature distribution in a PET-preform determines the quality of stretch blow molded bottles. A new heating simulation based on the zone method allows to determine the 3D temperature distribution to be used for a subsequent blowing simulation. Thus, the stretch blow molding process can be completely analyzed by a FEA. This can be used e.g. to improve the design of infrared-ovens.
Influence of the Stretch Blow Molding Processing Parameters on PET Bottles Properties
The paper deals with the analysis of the most influencing factors in the procedure of manufacturing poly(ethylene-terephtalate) bottles for packaging of table oil, injection stretch blow molding. The influence of individual manufacturing factors on the quality guidelines important in the manufacturing of PET bottles for table oil packaging, final volume, and post-shrinkage have been studied. The most influencing factors have been determined which affect the volume and shrinkage of PET bottles by using the central composite design.
Parison Formation in Blow Molding: Parison Dimension Prediction using Neural Network Model
The parison dimension distributions during the parison formation in extrusion blow molding were determined by analyzing video images of the parison. Two BP neural network models were developed based on the experimental data. The prediction of the parison diameter and thickness distributions can be made on line at any parison length or any parison drop time within a given range using the models.
Part Cooling in Blow Molding: Finite Element Solution
The part cooling stage of the extrusion blow molding process was simulated based on the ANSYS finite element software. The transient temperature profiles across the part thickness were predicted. The experiment results validated that the predictions are reasonable. Then the temperature dependent quiescent crystallinity development across the thickness was calculated using a Nakamura equation. The influence of the processing parameters, part thickness, and the thermal properties of plastics and mold materials can be analyzed.
The Residual Melt Layer Thickness as New Criterion for Ultrasonic Welding
Even today, setting up the process and finding the optimum parameter set for ultrasonic welding sometimes is a big problem. As the residual melt layer thickness is directly linked to the formation of the joint, a real improvement in setting up the process can be achieved by using it as determining criterion.
Characterization of Ultrasonic Plastic Welding Parameters in Lessening the Need for a Design of Experiment (DOE) Analysis
DOE is a powerful tool used in various process optimizations. In many cases, time and resources are overextended, making this tool unaffordable or impractical. With experimentation, it has been demonstrated that the time-consuming task of using DOE to determine the contribution of a parameter to a welded product, as well as the development of a model that predicts behavior, can be drastically reduced if the parameter characterizations presented in this paper are utilized.
Laser Marking for Automotive Interiors
Laser marking continues to gain acceptance as a preferred means for decorating parts found in automotive interiors. Beam steered laser technology presents a versatile and robust means for applying any design to a wide variety of materials. This paper will cover the fundamentals of laser technology including an overview of key parameters that a design engineer will find useful in supporting a reliable implementation on the production floor.
Automate or Perish: The Future of Pad Printing
Every day another company loses a pad printing application to a more efficient competitor. Many times a paradigm shift away from a vicious cycle of under-investment is necessary for companies to remain competitive.
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