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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Mechanical Properties of Injection-Molded Fiber-Reinforced Parts Theory and Verification
Mechanical properties of fiber-reinforced plastic parts largely depend on fiber orientation obtained from flow simulation to calculate anisotropic properties. This paper describes theoretical and experimental studies which showed the effects of linking process simulation and structural mechanical analysis to optimize the design process.
True 3D Numerical Simulation for Micro Injection Molding
The demand for miniature molded parts has been growing over last decade. The filling in micro structure regions are primarily 3D and hence cannot be properly modeled by the 2.5D approach. A 3D model is developed to simulate the micro molding. The numerical results are compared with the experiment.
True 3D CAE Visualization of Intra-Cavity" Filling Imbalance in Injection"
The intra-cavity flow imbalanced phenomena have been discovered in either a single cavity or a multi-cavity mold, and result in the uneven product quality within one cavity. In this paper, 3D numerical simulation method is applied to realize this imbalanced phenomenon and its physical mechanism.
Drop Test of a Compound Structure Composed of PC Plate and PCB
This paper proposes a feasible procedure in which both experiment and simulation are iteratively used to assess the responses to drop tests. An example of compound structure, which is basically comprised of a PC plate and PCB, was tested and simulated to show the performance of the proposed procedures. Compared with the results of a patented drop test platform, our test results not only achieved good correlations, but computational cost could also be considerably reduced.
Barrier Properties of Linear Polyethylene Films
Barrier and permeability is important in several PE applications. This study gives a broad mapping of how permeability depends on the PE and on film thickness.PE’s were blown to films and permeability for water vapor measured. The results were expressed by:Permeability coefficient = (Amorphous fraction)* (Amorphous fraction dependent factor) * (Correction factor) / Thickness.The amorphous fraction dependent factor has two different regimes depending on amorphous fraction.The correction factor, which is basically 1, increases with decreasing amorphous fraction, MFR and film thickness.
Cae Analysis of Rapid Thermal Response Molding Process for Thin Wall Parts
The present work covers simulation of thin wall molding using the Rapid Thermal Response (RTR) molding process. In order to account for the unique thermal boundary conditions of the RTR mold, coupled analysis with heat transfer simulation is suggested. Both numerical and experimental results show good flow estimation and birefringence prediction under rapid mold heating.
True 3D and Fully Transient Mold Temperature Simulation for RHCM Process
In the Rapid Heat Cycle Molding (RHCM) Process, the mold temperatures are usually quit high during filling and get cooled quickly in the cooling phase. A true 3D and transient thermal response heating and cooling analysis model is proposed to help analysis and optimize the process.
Rapid Mold Temperature Control on Micro Injection Molded Parts with High Aspect Ratio Micro-Features
Electromagnetic induction heating combined with water cooling are utilized to achieve a rapid mold surface temperature control for micro-feature injection molding process. Replication in molding micro features is greatly improved by rapid mold surface temperature rise within 60° to 140° using induction heating for about 2 to 3.5 seconds. Simulation shows that the E.M. wave can penetrate into micro channel bottom and cause about 2° difference temperature uniformity. For PMMA, complete replication of the 600µm depth and 30-50µm thick micro feature was achieved.
Three-Dimensional Numerical Approach for Core Plate Deflection
Non-uniform melt flow around the core plate during injection molding process can cause the plate to deflect during filling and packing stage. Moreover, this core deflection might result variations in wall thickness, especially for thin parts. In this paper, an effective 3D numerical approach is developed to simulate uneven melt pressure around core during injection molding and further predict the core deflection. One case is reported to indicate the success of the present model.
Effect of Epoxy Modifier on Flame Retardancy and Rheological Behavior of Acrylonitrile-Butadiene-Styrene(ABS)/Montmorillonite(MMT) Composites
ABS/MMT composites were prepared via melt intercalation to MMT with or without pretreatment of liquid epoxy resin. For the direct addition of epoxy, the composite has intercalated structure; while for the pretreatment of MMT with epoxy, the composite has exfoliated structure. Cone analysis results reveals slight difference in flame retardancy between the two composites. At low frequency zone, the composite with intercalated structure has higher storage modulus than the composite with exfoliated structure.
Mold Deformation Effects on Ultra-Thin Wall Injection-Molded Parts
Ultra-thin-walled injection molding is becoming important due to the explosive growth of requirement of thinner and lighter plastic parts, especially for portable electronic devices. However, the flow pressure and the uneven mold temperature in injection molding will cause variations in cavity dimension, and further reduce the precision of molding. In this paper, a 3D numerical approach is developed to predict the mold deformation effects and the variations of ultra-thin-walled part dimensions.
Polypropylene/SEBS Thermoplastic Elastomer - Nanocomposite Films
Nanocomposite (PP/SEBS/organoclay) films were sheet extruded with differing clay concentrations. Blends were compounded using a high shear single screw reciprocating kneader. Higher clay content increased the Shore A hardness of the films but induced a significant improvement in both O2 and CO2 barrier performance.
Oxypolypropylene as a Compatibiliser in Polypropylene-Nanocomposite Films
Nanocomposite films were prepared from polypropylene-organosilicate compounds, incorporating both oxypolypropylene (OxyPP) and a range of PP grafted maleic anhydride compatibilisers. X-ray diffraction suggested enhanced organosilicate exfoliation and dispersion, attributed to improved enthalpic interaction with the OxyPP compared with neat PP/organosilicate structures.
Performance of Mono-Layer Films Manufactured from EVOH/PP Compounds
Blown films were extruded from EVOH/PP compounds manufactured on a single screw extruder with a static diffuser. Oxypolypropylene and maleated PP oligomer were evaluated as compatibilisers. Results indicated improved gas barrier versus non-compounded blends and virgin PP films.
Structure and Performance of Novel Acrylonitrile-Styrene-Acrylate Nanocomposite
ASA nanocomposites were prepared by melt compounding with synthetic layered-silicate as a higher performance alternative to ABS. Mixed intercalated/exfoliated morphology was observed in the ASA nanocomposites, conferring marked improvement in modulus, thermal stability and flame retardancy.
Residual Stress Effects on Multi-Material Injection-Molded Parts
Process-induced residual stress is one of the most important problems that confound the overall success of injection molding process, especially for multi-material injection molding that uses two or more molds to produce a multi-material plastic part. It could cause the unpredictable warpage after demolding. The objective of this paper is to develop a numerical approach to predict the residual stress distribution of multi-material injection-molded part and further study its effects on the warpage after demolding.
Structure and Performance of ABS-Clay Nanocomposites by Melt Compounding
ABS layered-silicate nanocomposites were manufactured by melt compounding. X-ray diffraction and transmission electron microscopy analysis confirmed the achievement of hybrid intercalated and exfoliated structures, giving significant improvement in the mechanical, thermal and rheological properties.
Polyethylene Nanocomposite Films Incorporating LDPE/Nanoclay Masterbatch
Nanocomposite blown films were prepared with blowup ratios from 1.5 to 2.5, by direct compounding with 5% nanoclay and direct let-down of a 25% nanocomposite masterbatch produced by double-stage mixing. Results demonstrated improved clay exfoliation and orientation in films manufactured from masterbatch.
Experimental Investigation of Infrared Rapid Surface Heating for Injection Molding
A low cost and practical infrared rapid surface heating system for injection molding is designed and investigated. The temperature increase is verified on the mold plate with a thermal video system. A modified spiral flow mold was used to test the enhancing filling ability of the rapid surface heating system.
High Speed Hot Plate Welding
The paper describes the possibilities of a new generation of high-speed hotplate welding machines and the first results for the welding of low-viscosity thermoplastics. Possibilities for a new form of quality assurance and also a means of adjusting the optimum process parameters are presented.
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