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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For an economical production of micro components made of thermoplastics by injection molding a reproducible and precise process control is essential. An alternative to two-step plasticizing units, which are commonly used in micro injection molding, is the so-called inverse screw. This newly developed plasticizing principle enables the integration of a conventional three-zone-screw’s geometry in a miniaturized plasticizing unit drastically reducing the overall melt volume.
Improvement of the dielectric properties was achieved by combining two or more polymers in a layered geometry using film coextrusion process. In recent development, film production scale-up of thin nanolayered films, film metallization and capacitor winding capabilities were demonstrated to create the world’s first nanolayer film capacitor prototypes. Increased temperature use of the high energy density films was demonstrated in capacitors. The detailed results of the capacitors fabrication process and the corresponding properties are discussed in this paper.
Polyhydroxybutyrate (PHB) belongs to the family of polyhydroxyalkanoates (PHA) and is both, biobased and biodegradable. Due to its linear chain structure, PHB is highly crystalline and has a melting temperature close to its decomposition temperature. Pure PHB crystallizes very slowly, so that the use for some technical applications is not commercially viable. This paper describes the crystallization of pure and nucleated PHB by means of differential scanning calorimetry (DSC). The cooling curve and the metabolic rate as a function of temperature are elaborated.
Jianmin Liu, Sathish Kumar Ranganathan, Sean Culligan, May 2016
A new thermoplastic semiconductive power cable jacket compound is presented. The compound is designed by adding carbon blacks to a blend of linear low density polyethylene and elastomer to achieve overall excellent performance, including good electrical conductivity, excellent mechanical properties, superior environmental stress crack resistance, and low moisture vapor transmission rate as well as low temperature brittleness property. The compound meets wire and cable industrial specifications such as ICEA S-94-649-2013.
In this work, viscoelastic, isothermal extrusion film casting modeling utilizing 1D membrane model and modified Leonov model was performed in order to understand the role of extensional viscosity, elasticity and viscoelastic stress state at the die exit, on the polymer melt film stretching in the post die area. Experimental data for LDPE and theoretical predictions based on the eXtended Pom-Pom (XPP) model taken from the open literature were used for the validation purposes.
This paper details the analysis of the foam injection molding process which uses a foaming gas generated from a chemical blowing agent. The analysis is done using a numerical simulation program developed in this study. The simulation analyzes the injection molding process with the calculation of bubble nucleation and growth. Some experiments were conducted to validate the simulation results. The experiments performed include viscosity measurement and molding experiments. The experiment and simulation results compare reasonably well.
Lun Howe Mark, Raymond K.M. Chu, Guilong Wang, Chul. B. Park, May 2016
Achieving uniform, microcellular injection molded foams with large cross sectional thicknesses and high void fractions is difficult, due to the large temperature gradient. To investigate this issue, a thick part mold cavity has been manufactured and the effects of injection flow rate and mold temperature have been investigated. Higher injection flow rate resulted in higher cell density; while higher mold temperature resulted in more uniform cell density.
Gabriel Geyne, Matt Proske, Laura Florez, May 2016
This paper explains a new approach taken by a thermoplastic supplier running virtual trials instead of floor trials to compare and evaluate the performance of different MFI grades. The evaluation results showed energy consumption reduction in high MFI grades due to lower injection pressures and lower clamping force requirements. The total cycle time was reduced when using high MFI grades in comparison to low MFI due to faster cooling rate of the part.
Robert L. Sherman, Jr., Kimberly E. Kern, Steven R. Torchia, May 2016
Baerlocher has developed a new family of polymer stabilizers called Baeropol® RST (Resin Stabilization Technology). Baeropol® RST works synergistically with standard antioxidants to improve color, stability, and performance of polyethylene and polypropylene resins, while maintaining GRAS FDA food contact regulations. This synergy can allow for a reduction in the amount of both phosphite and antacid used in current resin formulations, while giving equal or better performance.
Seemingly simple errors by the designer can add up to millions of dollars or more in direct, indirect and opportunity costs. A hypothetical case study based on realistic situations will illustrate how this can happen. Actual parts will be handed out to the attendees to drive home the point.
It‘s common practice for the production of PVC compounds to generate a premix of all components first. This premix is then plasticized and homogenized by an extruder. The production of the premix is a complex, energy consuming and expensive process. The concept of direct extrusion is to dose all components directly into the extruder and to eliminate the entire premixing procedure. With this method, product composition and quality can be optimized and an increased cost efficiency can be achieved.
In order to develop new improved material by blending or alloying polymers effectively, it is important to understand the fundamental mixing behavior of the polymers. This paper studied phase behavior of aliphatic nylon 6 and nylon 612 blends based on melting temperature depression theory. A phase diagram was constructed using Flory-Huggins approach. This information will help formulators develop useful materials.
Variables that effect layer interface distortion in multi-layered systems were studied computationally to understand how to control layer alignment for the creation of multi-layer tubing with high layer numbers consisting of concentric rings of material. Variables were studied through one particular geometric transition, from flat to a semi-circle and it was found that layer alignment could be controlled by the incorporation of slip conditions in the channel.
Praveenkumar Boopalachandran, Xue Chen, Kasem Chowdhury, Janece Potter, Yan Yang, Steve King, May 2016
Dow is exploring new uses for polyethylene-acrylic acid (EAA) based copolymer dispersions. The use of hard water during the synthesis and dilution of EAA dispersions can cause precipitation leading to both technical and economic challenges. This report documents the characterization of the cross-linked reaction product generated from a model EAA copolymer dispersion with calcium ions.
In this work, we consider the effect of the addition of functionalized silica particles to a poly (tetramethylene oxide) (PTMO) based polyurethane that is a candidate to be used as for flexible storage containment for a variety military fuels. We have synthesized urethanes with silica concentrations varying from 0% to 40% by weight and evaluated the diffusion of commercial gasoline and their mechanical properties.
Four case studies are presented to illustrate failures associated with the interaction between plastic components and metal fasteners. The use of metal fasteners to secure and assemble plastics is widespread. The presented cases illustrate how the failure analysis process was used to identify the failure mechanism as well as the primary factors responsible for the failures. The four cases depict representative failures involving varied designs and service conditions.
Formulating the wide variety of Colors in demand today for thin section injection molding can be challenging. Customers require dimensionally stable parts that often must match or nest in assembly. Colorant selection is critical to meeting today’s demands and this paper describes a system to achieve these goals.
Hesam Ghasemi, Ying Zhang, Philip J. Bates, David DuQuesnay, Gene Zak, May 2016
Thermal gravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) techniques were used to detect thermal degradation of polyester-polycarbonate blends at the weld interface after laser transmission welding. TGA and FTIR were found to be the most sensitive and able to differentiate between degraded and non-degraded material.
Teresa Karjala, Lori Kardos, Apurva Shah, May 2016
Blends of LLDPE (linear low density polyethylene) and LDPE (low density polyethylene) are used in many film applications. This paper shows how several high performance LDPE resins can be used as a blending component to increase output or throughput on blown film lines. In addition, some of these LDPE resins are utilized in shrink films, providing a good combination of shrink and optics, and are also used in foams and extrusion coating among other applications.
Anthony Walder, David Cozzens, Pallavi Kulkarni, May 2016
Thermoplastic polyurethanes (TPUs) are a class of thermoplastic elastomers (TPEs) that are used in a variety of applications (1). TPUs exhibit low temperature flexibility, excellent abrasion resistance, high tensile strength and good processing characteristics. The current medical grade TPU’s have unique property that the flex modulus decreases (softens) when placed in the body. A new resilient non-soften (RNS) thermoplastic polyurethane has been developed that does not soften like the current grades.
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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
Available: www.4spe.org.
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.
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