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Feed: THE LATEST NEWS, EVENTS, JOBS RESOURCES FROM SPE



SPE Honors Noel Tessier for Lifetime Achievement
28-Sep-16

BETHEL, CT., U.S.A., September 28, 2016: The Society of Plastics Engineers (SPE) Thermoforming Division has presented Noel Tessier of CMT Materials, Inc. with its lifetime achievement award.



SPE Honors Noel Tessier for Lifetime Achievement
28-Sep-16

BETHEL, CT., U.S.A., September 28, 2016: The Society of Plastics Engineers (SPE) Thermoforming Division has presented Noel Tessier of CMT Materials, Inc. with its lifetime achievement award.



Value Stream Process Engineer | Bemis Associates Inc.
23-Sep-16

US - MA - Shirley, What you need: BS or MS in Chemical or Plastic Engineering 3-6 years of experience in a process engineering role Excellent hands-on problem solving skills Excellent oral and written communicatio



Modeling of OBSH Decomposition Kinetics as Blowing Agent for Cellular EPDM Rubber
22-Sep-16

The decomposition kinetics of p’,p-oxybis benzene sulfonyl hydrazide (OBSH) and the change of its behavior when mixed with additives and rubber are determined by using thermal analysis. This study uses Differential Scanning Calorimetry (DSC) and Thermogravimetry (TGA) to understand the exothermic reaction. Different kinetic models were evaluated using the least-square method to determine activation energies and reaction variables. As a result, it was found that the Kamal-Sourour model is the most accurate reaction model, confirming the information found in literature.



Hybrid Composite Materials Made of Polypropylene with Wood and Polyethylene Terephthalate Fibers
22-Sep-16

We aim to manufacture injection molded components which consist of thermoplastics reinforced with fibers and which have improved properties (high strength and high notched impact strength). Thus, we intend to access new application fields for the not readily visible area of the automobile interior.



Microcellular Injection Molding of Polypropylene and Glass Fiber Composites with Supercritical Nitrogen
22-Sep-16

Microcellular injection molding of polypropylene and glass fiber composites (PP-1684/GF-950) was performed using supercritical nitrogen as the physical blowing agent. Based on design of experiment (DOE) matrices, the influences of GF content and operating conditions on cell structure, GF orientation and mechanical properties of molded samples were studied systematically. The results showed the cell morphology and GF orientation of foaming parts were definitely influenced by the cooling and shear effects. The mechanical properties of foamed PP/GF composites could be effectively enhanced by improving the cell morphology, dispersion state and orientation of the GF at optimal weight percentage wGF/wPP=11.8%. And the optimal conditions for injection molding were obtained by analyzing the signal-to-noise (S/N) ratio analysis of the mechanical properties of the molded samples, which were a shot size of 36 mm, a supercritical N2 weight percentage of 0.4%, an injection speed of 52 mm/s, a melt temperature of 190 °C, and a mold temperature of 70 °C. The molded specimens of PP-GF composites, produced under those optimal conditions, exhibited very uniform fiber dispersion and microcellular structures with an average cell size less than 30 ?m. And the mechanical properties normalized by weight ratio of the microcellular samples were increased significantly, especially the impact strength.



The Role of Rheology in Non-Pressurized Polymer Foaming Systems
22-Sep-16

This work explores the influence of rheological properties on polymer foam development in non-pressurized systems. To understand the complex contributions of rheology on different stages of the foam processing in such systems, visualization studies were conducted using a polymer-foaming microscopy setup. Morphological analysis was used to determine the rheological processing window in terms of shear viscosity, elastic modulus, melt strength and strain-hardening, intended for the production of foams with greater foam expansion and more uniform bubble size distribution.



Development of Non-Destructive Inspection Method Using Ultrasonic Wave for Degradated GFRP under Chemical Environment
22-Sep-16

This paper describes the weight change rate and mechanical properties of GFRP after the immersion test in 10% sodium hydroxide and 30% hydrochloric acid solutions and vapors at 40°C. The bending stress and the flexural modulus of the sample immerged in 10% sodium hydroxide solution for one month greatly decreased although these of the sample immerged in 30% hydrochloric acid solution for one month did not change. The generation of the acoustic emission (AE) started early at the bending test for the sample immerged in 10% sodium hydroxide solution. It was also found that there was a large difference of ultrasonic echo level between before and after immerged samples in 10% sodium hydroxide solution.



Data Driven Decision Making for the Injection Mold Designer
22-Sep-16

The science of Tribology is generally known only to certain specialists who focus on its study and the effects on industrial materials. It can drive many decisions that are made daily by the injection mold designer. In many molds there are assemblies that benefit from optimizing a surface, to minimize the effect of wear, which can be the result of one surface coming in moving contact with another. The basics of Tribology are important for all designers to understand because it may improve the longevity, of the assembly, through design or to advise the end user of adequate, required maintenance. Component longevity is the goal, but ultimately cost savings is the outcome, when replacement components and lost man-hours make an assembly unaffordable to maintain and maintenance replacements are required too often. When Tribology knowledge can be used to extend the life of specific components so they will last longer and insure the assembly’s practical life, everyone benefits. This paper will review basic definitions, concepts the designer should have in mind, the effect on industrial materials and verification methods. At the very least, this information will lead to an understanding that additional testing and analysis may be required for verification of product life.



Minimization of Part Warpage in Injection Molding through Ideal Wall Thickness Distribution
22-Sep-16

In this study, a method to reduce the warpage of injection molded parts by optimizing the distribution of their wall thickness is proposed. The method is based on an optimization procedure consisting of mold flow analysis, a parameterization tool for geometry manipulation and an evolutionary optimization algorithm. Starting with the initial design for the mold cavity, the procedure modifies the wall thickness distribution at user-defined area-sections. The result is an STL-file of the optimized design. Application on a warpage demonstrator reveals the effectiveness and plausibility of the proposed optimization procedure.







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