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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Concurrent Engineering Approach for Designing a Novel Plastic Pallet
The concurrent engineering approach was used to design a lightweight, one-piece-tailored and very resistant pallet. Three CAD/CAE software programs were involved in the designing process. The pallet design went back and forth between the software until it was optimized and the part met all the functional, mechanical, processing, and machining requirements at the lowest pallet weight possible.
Material Selector for LLDPE/LDPE Blends for FFS Applications
There is a delicate balance between processability, mechanical properties and seal performance when LDPE/LLDPE blends are used. Choosing the right blend proportion is sometimes a very difficult job, and high resin and time consuming. An easy to- use selector that can run in most spreadsheet programs was devised based on DOE approach.
Properties Predictor for HDPE/LDPE/LLDPE Blends for Shrink Film Applications
A technique that involves design of experiments was developed to generate set of equations that predicts processing, mechanical and shrink properties of HDPE/LDPE/LLDPE blends. The results are presented in an easy-to-use spreadsheet that can be used even in pocket computers.
Effect of Ultrasonic Energy on Polymer Amalgamation
Ultrasonic energy was demonstrated to promote amalgamation between a polymer melt and polymer solid during injection molding. Advantages include the ability to injection mold at significantly reduced temperatures while achieving favorable bond strength. In addition, ultrasonic energy promotes joining chemically dissimilar polymers, bonding to inserts, and co-molding or overmolding dissimilar polymers.
Effect of Atmospheric Plasma Treatment on the Surface Energy of Polymers
This paper describes experiments to quantify surface energy changes on polymers after exposure to atmospheric plasma. Atmospheric plasma treatment permits the functionalization of surfaces at near-ambient temperatures. Various polymers were treated with the plasma unit, and the surface energy changes as a function of time and adhesion characteristics were monitored.
The Vented Barrier Screw
The typical barrier screw (high efficiency screw) concept has been modified to provide for venting (devolatilizing) of polymer through a bore in the drive-end of the screw. The bore is connected to the melt channel by a vent hole in the melt-channel screw-root. The melt channel is deep so that a free surface of polymer melt and path exists to release gasses to the vent. The screw design was tested and shown to process and devolatilize PET powder, PET pellets, and PEN pellets at greater rates and with less power than a conventionally vented two-stage screw in the same extruder with the very same polymers.
Extrusion Process and Screw Design Investigation via Experiment Design and Computer Simulation
This paper explores the value of Design of Experiments (DOE) statistical analytical techniques and mathematical modeling of extruder behavior to characterize extrusion performance.
Improved Dispersion of Yellow Metal Azo Pigment in Polyethylene Film
Pigment Yellow 62 (PY62) is widely used in the extruded polyethylene film industry. Increasing demands for throughput, quality and reduced wastage led to the need for a new grade of PY62.Research showed that control of PY62 particle size and dispersion directly affected properties such as film transparency, colour development, extruder pressure build and processing time. Using this knowledge a new PY 62 for polyethylene film was developed and successfully tested.
A Review of Melting Mechanisms in Single Screw Extrusion
This paper will present a review of basic melting mechanisms and the assumptions on which melting models are based. In addition a discussion of the impact of checking models with extruder model calculations vs. direct melting measurement (screw simulator). A discussion of the low screw speed mechanisms" seen lately and discuss the impact of measuring techniques controlling observations vs. the observations controlling the measurement techniques"
Observations on Field Fusion Joining of Large Diameter HDPE Pipe
Large diameter high density polyethylene (HDPE) pipe has been utilized for various municipal and industrial applications for over 30 years. Butt fusion procedures developed in the earliest days of polyethylene pipe fusion are still the ones recommended for joining this pipe in the field. Analysis of recent problems with pipe fused in the field suggests that modern workers are trying to speed up the joining process by not adhering to all of the recommended procedures. These problems will be examined in detail and the implications of short cuts in the procedure discussed.
Effects of Process Conditions on Shrinkage of the Injection-Molded Part
Shrinkage behavior plays a critical role in determining the final shape and dimensions of an injection-molded part. In this paper, the CAE and Taguchi DOE technique were combined to investigate the influence of factors on the shrinkage behavior of the injection molded part and optimize the process conditions, the part quality was improved under the optimum process conditions obviously.
Problem Solving by Thermal Analysis in the Automotive Plastic Industry
Thermal analysis studies the thermo physical and thermo chemical properties of a material. In a series of case studies, various thermal analyses, such as DSC, TGA, TGMS, DMA, and TMA were used to solve real life problems in the automotive plastic industry.
Two Solutions for Three-Dimensional Flow Simulation of Injection Molding
This work presents two methods: Dual Domain and Real 3D to simulate the flow on the solid model from CAD. Dual Domain assumes the melt flow along the dual surfaces and employs hot runners to connect the coupled nodes to keep the melt flowing uniform on the surfaces. Real 3D employs an iterative method to solve coupled pressure and velocity independently. It reduces memory needs in simulation and enhances the stability of numerical scheme. Experiments indict they are valid for certain parts.
Selecting the Right Decorating Method - Pad Printing vs. Screen Printing vs. Hot Stamping
This article will help to explain the various aspects, including strengths and weakness’ of the three primary decorating technologies that are widely utilized in the plastics molding/ decorating industry, namely; Pad Printing, Screen Printing and Hot Stamping technologies. While each technology has its place and area of competence, it is important to note that not one of these technologies is perfect for all decorating applications. So with that in mind, you may end up needing to invest in more that one or all of these useful decorating technologies.
The Systemic Analysis of Metal Injection Moulding
The study carried out comprises the making and description of the general model for metal injection moulding and the analysis of mentioned process with Ropohl’s theoretical definitions. The model includes a complex of elements of metal injection technology, the elements being the core of the model, and the inputs, outputs and relations between the above-mentioned elements. The basic principles of this technology and all the phenomena connected with MIM are represented by means of inputs, outputs and relations. An exact analysis of metal injection moulding was made by a precise and systematic approach.
Case Studies of Plastics Failure Related to Molecular Weight or Chemical Composition
Processability and product performance depend on having the appropriate polymer molecular weight and composition of the formulation. Failures were caused by errors of molecular weight or composition. GPC played a key role in molecular weight cases. IR spectroscopy and GC/MS were used for composition.
Mechanical Property Optimization of Polypropylene Based Blends Using a Continuous Chaotic Advection Blender
A continuous chaotic advection blender was used to controllably develop in extrusions a variety of morphologies in PP/EPDM and PP/LDPE blends. Impact toughness was enhanced by 760% with the addition of 20% EPDM by a blend consisting of numerous interconnected layers. Smaller but significant improvements to impact properties were also obtained for PP-LDPE blends. Enhancements were greater than those derived from droplet morphologies typically obtained with conventional compounding equipment.
Influence of Shear on Immiscible Polymer Blend Morphology Development by Chaotic Advection
In recent years, a wide variety of morphologies in immiscible blends at fixed compositions have been formed in chaotic advection blending devices. To clarify how particular morphologies arise, computational simulations have been performed and compared to findings with a continuous chaotic advection blender. Simulations are in good qualitative agreement with experiments. Hole formation and melt redistribution among layers and shear during processing interact to give blends with dual continuous phases, fibers, and droplets and other morphologies.
Novel Clay Nanocompositeswith Platelets Oriented by Chaotic Advection
A continuous chaotic advection blender (CCAB) has been used to orient clay platelets prior to extrusion steps. Methods allow extrusion of nanocomposites with oriented platelets so clay loading can be reduced and properties can be enhanced. Extrusions can be of a variety of forms such that profile parts or high barrier films can be produced. Micrographs of the nanocomposites are presented and related to processing conditions.
A Method of Quantifying Program and Course Performances against ABET Criteria
This paper describes a spreadsheet based method that quantifies the performance of an educational program and its various courses against the ABET criteria. Inputs to the spreadsheet are: student learning outcomes for each course, cross index tabulation of these outcomes to ABET criteria, student scores, and credit hours of courses. This approach identifies the strong and weak points of each course as well as the whole program. This method becomes an integral part of a continuous improvement plan.
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