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.
|= Members Only|
A Revised Approach to Rheological Behaviour and Processing Parameters of Polycarbonate Compound with Dispersion
The objective of this work is to study the rheological characteristics of the compound of polycarbonate resins with different melt flow indexes and the affects of the processing parameters PC1 content (30wt%-pph) of MFI (25gm/10mins) and PC2 content (70 wt. %-pph) of MFI (6.5gm/10mins). By understanding the relationship between shear rate and viscosity, it becomes possible to define the viscosity model and exact color shifts. The temperature was varied at three stages (230°C, 255°C and 280°C) to study its effect on rheological characteristics, colour differences (dE*), pigment size distribution and dispersions.
Keratin Bio-Composites with Polysiloxane Thermoplastic Polyurethane
A sustainable resource in the form of chicken feather derived keratin was used to enhance the thermo-mechanical properties of polysiloxane-polyurethane bio-composites. Two methods, solvent–casting–evaporation–compression molding, and solvent–precipitation–evaporation–compression molding were used to create new bio-composites incorporating 20 %·w/w of chicken feather fibers into a polysiloxane-polyurethane matrix and the results were compared. A molecular modeling visualization indicated the possible existence of hydrogen bonding between fibers and polyurethane molecules. The thermo-mechanical properties of both the polysiloxane polymer and feather reinforced bio-composites were assessed using thermogravimetry, dynamic mechanical analysis and stress–strain measurements with hysteresis loops. The dispersion uniformity of the keratin fibers in the plastic matrix was investigated via macro photography. Addition of chicken feather fibers to the polysiloxane matrix was found to decrease the recovery strain and mass loss of the composites (at lower temperatures) but increase the elastic modulus, storage modulus, and char level (at higher temperatures). The results demonstrate that keratin derived from what is currently a waste product from the poultry industry (with significant economic and environmental disposal costs) can improve the thermo-mechanical properties of the tested bio-composites simply and cheaply, with potentially large cost savings and environmental benefits.
Fabrication of Hybrid Polymeric-Metallic Foams as Scaffolds for Bone Tissue Engineering
Thermoplastic foams have been explored for their use as scaffolds for bone tissue engineering. Challenges exist in their applicability and strategies for enhancement in mechanical properties are needed. In this paper we report the fabrication of hybrid polymeric-metallic foams where magnesium was electrodeposited on polyurethane foams with the goal to enhance the mechanical properties of polyurethane foams. The foams were characterized using visual methods and optical microscopy techniques, which clearly showed the presence of magnesium fused foams.
Weld Lines in Injection Molded Parts: Strength, Morphology and Improvement
Weld lines are rather well known as optical and/or mechanical blemishes in plastics products that can be avoided barely by mold design or process control. Although many publications show single solutions to optimize weld line strength in injection molded parts, there is no complete comparison of thermoplastic polymer materials available. Therefore, an overview about formation, morphology and strength of weld lines for amorphous, semicrystalline and filled polymer materials is given.
How to Add Value to Capillary Rheometers
Capillary Rheology has been around for many years. As technology moves on, this has opened doors to use the capillary rheometer as a base on which to build a sophisticated R&D platform to perform a wide range of other tests, which help rheologists and their colleagues. We look at extensional rheology, elasticity, pressure- volume-temperature (PVT), thermal conductivity (TC), sharkskin analysis and the effects of counter pressure measurements. Those are but a few of available options to lab managers who try to squeeze out extra capabilities from their budgets.
Single Pellet Extrusion
Analysis and results are presented to model the melting of a single pellet in an extrusion screw. The analysis considers transient heat conduction with a convention boundary condition and three sources of internal generation. The results suggest that the theoretical melting time for a pellet is on the order of seconds and more optimal extrusion screw designs are possible.
A Protocol for Filament Production and Use in Fused Deposition Modeling
A protocol for filament production and use in fused deposition modeling (FDM) is proposed that includes four stages: 1) material characterization of the thermoplastic feedstock, 2) filament production, 3) test specimen production, and 4) protocol verification. Preliminary results indicate that the protocol is feasible and will assist in broadening the portfolio of materials for use in FDM, optimizing FDM process conditions, and developing a capable FDM process simulation.
Capacitance to Digital Converter Method for Dielectrostriction of Polymeric Materials
Dielectrostriction effect has been applied as a polymeric material characterization method for decades. However, inherent complexity of the interdigital electrodes capacitor and capacitance measurement inhibits its further industrial applications. In this research, a systematical study was conducted on the dielectrostriction sensing of polymeric materials with capacitance to digital converter method, including its methodology and experimental validation. Finally, experimental results suggest a promising effectiveness of this capacitance measurement method.
The Effect of Flow Channel Aspect Ratio on Layer Uniformity in Flat Extrusion Dies
Common extrusion systems used to produce multilayer structures include a coextrusion feedblock - which assembles individual melt streams into a narrow multilayer “sandwich”, and a flat die - whose primary purpose is to uniformly distribute this multilayer structure to the desired final width. Given the demand for improved layer uniformity, extrusion die distribution manifold features have been developed to reduce the distortion of coextrusion interfaces. This paper will discuss the effect of die manifold aspect ratio on coextrusion uniformity.
The Potental of Expanding Elongation Flows to Increase the Through-Plane Thermal Conductivity
Thermal conductive plastics are often used in electronical components for heat management or in heat exchangers. Often heat has to be conducted in thickness direction of a thermal conductive part (through-plane). Yet, conventional plastics processing techniques like injection molding or extrusion yield lower thermal conductivity in thickness direction, especially for thin parts. Therefore, a new method is presented, which significantly increases the through-plane thermal conductivity using expanding elongation flows. Medium expansion ratios of 4 to 5 already achieve high
Failure Analysis of a Plastic Toy Helicopter
A failure analysis was performed on a plastic toy helicopter that exhibited several fractures of both the rotor blades and the rotor hub sections. Fractography and flight testing were utilized to determine whether or not the toy helicopter fractures were due to operation and flight of the helicopter or due to other causes. The multiple fractures were found to be inconsistent with normal operation and flight of the helicopter and the analysis showed that the fractures were likely due to manual manipulation of the rotor blades and hub sections prior to use of the helicopter.
High Gloss “Piano Black” Acetal Copolymer
High gloss, piano black is an appearance that continues to grow as an accent color for automotive interior, cosmetic packaging, small appliances and other markets. The most common way to achieve a piano black look is by painting plastic parts using a two-coat or three-coat painting process which adds significant part cost and scrap. A molded-in-color solution is desirable to reduce cost without sacrificing quality. This paper discusses development of a molded-in-color solution in acetal copolymer resin and how that solution compares to other resins commercially available.
Predicting the Impact Puncture Response of Multilayer Flexible Food Packages Using Explicit Finite Element Models
In previously presented work (ANTEC 2015), the authors developed a laboratory test method capable of ranking the impact puncture resistance (IPR) of multilayer flexible packages. This paper describes the development of nonlinear finite element models capable of predicting the IPR of the same multilayer structures. Information about the method used to obtain material properties at relevant strain rates, and comparisons between predicted and experimental responses are presented.
The Effect of Viscous Encapsulation on Layer Uniformity and Rheology in Multilayer Coextrusion
Multilayer coextrusion is a process in which two or more polymers are extruded and joined together in a feedblock or die to form a single structure with multiple layers. This paper will discuss the effect of viscous encapsulation especially in a flow channel with a noncircular cross-section on layer re-arrangement and rheology of a coextruded structure.
Viscosity Measurement of Multilayer Structures via Parallel Plate Rheology
Parallel plate rheometry has been used to characterize the viscosity of multilayer polymer structures. It has been demonstrated that this technique is not a good substitute for performing such measurements using a coextrusion slit die rheometer. For the purpose of designing dies for producing multilayer structures, one needs good viscosity data that correctly represent the behavior of the intended structure under flow and for this reason, a coextrusion slit die rheometer is recommended.
PC/ABS Recovered from Shredded Waste Electrical and Electronic Equipment
Our industry leading separation technology enables us to recover a variety of plastics from complex mixed streams such as shredded waste electrical and electronic equipment (WEEE). Plastic flakes recovered using our process are compounded and sold as pellets suitable for use in injection molding applications. Polyolefin and styrenic plastics have been in our product portfolio for nearly a decade, but recently we have been expanding our range of plastic products. This paper looks at the challenges of recovering additional plastics and the properties of PC/ABS we have recovered from shredded WEEE.
Modeling and Simulation of the Foaming Process in Elastomers
A numerical simulation for elastomer foaming extrusion process was made. Energy equation coupled with unit cell model were used and solved by Radial Basis Function (RBF) and Finite Difference Method (FDM), respectively. The curing reaction, the change of viscosity and the concentration of the gas inside the rubber are also taking into account. The effect of processing parameters as temperature of vulcanization and the velocity of the profile inside the tunnel were evaluated and the resultant bubble size and its distribution were analyzed.
New Approaches for the Integration of Process Disturbances in Injection Molding Simulation
During the product development of injection molded parts, simulation software is used to predict process parameters and part quality during the production process. The integration of process disturbances into the injection molding simulation software leads the way to a prediction of the quality variation. Thus, the optimization regarding a robust process parameter set already during early stages of the product development process is possible.
Application of TRIZ Tools to Develop a New Plastic Chemical Dispenser
The application of several TRIZ (Theory of Inventive Problem Solving) tools to support the development of plastic products is presented. The considered tools are the Function Analysis, the Inventive principle application, the solution of Physical Contradictions and Trimming. A plastic chemical dispenser is used as study case. The design starts from a plastic fish feeder that is commercially available. After applying the TRIZ tools, the design evolves to a complete new concept, overcoming the original design limitations.
We're sorry, but your current web site security status does not grant you access to the resource you are attempting to view.
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
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