SPE Library

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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Conference Proceedings

Polypropylene Impact Copolymers for Improved Tiger-Marking Resistance in Large Part Injection Molding
Joel M. Carr, Jeffrey Salek, Mark Chappell, Mois‚s Werlang, Jake Fallon, May 2015

This work will focus on Polypropylene Impact Copolymers (ICPs) aimed at reducing the surface aesthetic defect known as tiger-marking which is formed during large part injection molding of compounded thermoplastic olefins. Emphasis will be placed on rheological predictive testing and how this translates to the final part aesthetic performance.

Qualifying a Recycled Material with Stringent Engineering Properties Requirements Using Six Sigma
Vikram Bhargava, May 2015

Recycling commodity plastics with non-stringent mechanical requirements present few technical changes other than justifying the cost of recycling. When considering recycled engineering plastics for high end products with very tough mechanical, cosmetic (including custom color), processing, cost and reliable availability requirements with minimal lot to lot variation, it becomes a much bigger challenge. This paper deals with a successful case study in overcoming these challenges.

Determination of the Zero Shear Viscosity of Polyethylene
Joo Teh, Wen Lin, Padmini Popuri, May 2015

The zero shear viscosity (ZSV) of 10 commercial polyethylene resins has been determined with a creep test and the traditional oscillatory frequency sweep test. Identical results were obtained from the two different test methods. The obtained ZSV by either method can be used to evaluate the long chain branching content of polyethylene resins.

Composites for Shielding Electromagnetic Radiation
Veronika Vogel, Michael Gehde, May 2015

More and more electronic housings are made of polymers instead of metals. Ensuring failure-free operation of electronic equipment and preventing a negative influence on electronic components in the environment shielding actions have to be implemented. The objective of this paper is to present an approach, which allows producing large and highly stressable electronic enclosures such as battery boxes for electric vehicles and to examine systematically weak points in future junctions of components.

Surface Modification of Nano Silca for Organic/Inorganic Hybrid UV Curable Acrylate Hard Coating
Ho Jong Kang, Song-hye Hwang, Seungwoo Bak, Doowhan Kang, May 2015

The effect of acrylate surface modified nano silica on ultraviolet (UV) curing characteristics of acrylate hard coating material was studied. Our photo DSC results show that acrylate surface modification on nano silica improved the UV curing of acrylate. It was found that acrylate modified nano silica caused the enhancement of hardness of acrylate hard coating with maintaining of reasonably good optical properties for the hard coated optical film application.

Molding Strategies for Bridging Production Volumes
David Kazmer, Stephen P. Johnston, May 2015

Fixed and marginal costs are analyzed for plastic part production with class 101 injection molds, aluminum tooling, prototype molds made by additive manufacturing with photopolymers, and products directly manufactured by 3D printing via fused deposition modeling of thermoplastics. The analysis indicates that the production costs can vary by orders of magnitude, and that different processes are preferred with varying production quantities.

Combined X-Ray and Optical Pellet Inspection for Smallest Impurity Detection during Plastic Pellet Production and Processing
Christian Frank, May 2015

Impurities in plastic pellets have to be detected and sorted out effectively, even when they are melted down into the pellet. This is achieved by a purity inspection system, which includes a combination of X-ray technology and an optical system. The X-ray technology looks inside the pellets, independent of non- transparency and color. With this new technical approach, even 50æm contamination can be detected and therefore a 100% inspection for smallest contamination is possible.

Discussing the Feasibility of Implementing Rotational Foam Molding Operations Based on Physical Blowing Agents
Remon Pop-Iliev, May 2015

This paper focuses on evaluating the suitability of technologically-distinctive novel processing concepts for successfully transforming engineering resins into rotationally molded cellular polymeric composite articles of controllable densities in terms of using physical blowing agents while achieving simultaneous retention of fine-celled foam morphologies while maintaining a uniform thickness of the solid skin and while reducing the processing cycle times and energy consumption.

Characterization of Carbonized Electrospun Lignin Fibers
Vida Poursorkhabi, Manjusri Misra, Amar Mohanty, May 2015

Non-woven carbon fiber mat was produced by thermal treatment of the electrospun lignin fibers. Aqueous solution blends of organosolv hardwood lignin and 5 percentage of high molecular weight poly(ethylene oxide) were electrospun. Average diameter of lignin fibres had a 25% reduction after carbonization. Results of Raman spectroscopy, surface area analysis, and thermal conductivity are comparable to carbonized fibers obtained from electrospun PAN.

Impact Puncture Resistance of Multilayer Flexible Food Packages
Leopoldo Carbajal, Rong Jiao, Diane Hahm, Barry A. Morris, Randy Kendzierski, May 2015

The development of a laboratory test method to rank the relative impact puncture resistance of flexible packages is presented. Details about the laboratory test, and the method used to rank the structures are given. Test results for selected multilayer structures are shown, and a ranking based on the test results is presented. In turn, this ranking is compared against results obtained using a drop test developed for the purpose of simulating the food filling portion of the packaging process.

Bioadhesive from Lignin and Dried Distillers? Grains with Solubles (DDGS)
Tao Wang, Manjusri Misra, Amar Mohanty, May 2015

Lignin and dried distillers? grains with solubles (DDGS) were utilized to prepare biobased adhesives at different DDGS-to-lignin ratios. The adhesion properties of the bioadhesives for bonding plywood were then evaluated. The adhesives prepared from the mixture of DDGS and lignin showed higher bonding strength than the adhesives prepared from DDGS and lignin alone. Analysis of the hot pressed adhesives showed that the DDGS extract and lignin had favorable interaction, which contributed to better performance of the hybrid adhesives.

High Accuracy Methods for Foam Injection-Expansion Simulation
Laurence Ville, Guillaume Fran‡ois, May 2015

In this paper, we propose a set of advanced numerical methods in order to simulate foam injection-expansion processes in a single step. Our approach is based on a set of stabilized solvers for each governing equation. These solvers are coupled with an advanced global stabilization algorithm and a multi-criteria adaptive meshing technology. These new technologies provide realistic results. We present several analytical and technical examples to demonstrate the overall robustness.

Capillary Rheometry Transient Data Analysis
Amir M. Moshe, David Kazmer, Stephen P. Johnston, Shmuel Kenig, Robert Malloy, May 2015

A transient rheological analysis method is presented with investigation of three modeling effects: shear rate dependence, relaxation spectrum, and melt compressibility. Results are presented for Cross-WLF shear-viscosity model, two relaxation spectrum models and two compressibility conditions. The Cross-WLF viscosity model together with a power-law relaxation spectrum and melt compressible conditions yield the highest correlation between the modeled and observed viscosity.

Peelable Seal Films With Enhanced Moisture Barrier Properties For Flexible Packaging Applications
Dan Falla, May 2015

Most cereal and cracker packages are designed to have the seal layer peel apart while being opened. Unfortunately, opening these packages often results in catastrophic failure of the film and spillage of the contents. In this study, various types of peelable seal layers were investigated. In addition, a new high moisture barrier sHDPE was evaluated.

New Peel Seal System for Flexible Medical Device Packaging Applications
Patrick Thomas, May 2015

Peelable flexible medical device packaging films are typically heat sealed to a breathable spunbonded polyolefin substrate or medical grade paper used in order to allow for ETO sterilization. A newly developed uncoated nylon reinforced paper provides an alternative to materials traditionally used for lidding. This paper serves to demonstrate the successful use of a mixture design of experiments in the development of a new peel/seal system.

Mechanical Behavior and Structure Variation of PCL/HA Composite under Different Strain and Strain Rates
Haibin Zhao, Zhixiang Cui, Binyi Chen, Xiang-fang Peng, May 2015

The structure-mechanical property correlation of the injection molding PCL/HA composite was explored by studying their structural and morphological variations under different strain rates and tensile strain. It was showed that the strain-hardening behavior of PCL/HA composites were influenced by the tensile parameters. The crystallinity and orientation increased with the increased of strain rates.

Chemical Resistant TPE Material with Adhesion to Engineering Plastics
Florian Vetter, Sehyun Kim, May 2015

In an effort to address to the growing demand for soft, chemical resistant materials in over-molding applications, KRAIBURG TPE has developed a series of thermoplastic elastomer (TPE) materials, called COPEC?. The performance and properties of COPEC? combine the benefit of easy processing and chemical resistance compared to alternative materials. A comparative study has been conducted in the course of this paper.

A Review of Some Important Mixing Processes for Single-Screw Extruders
Gregory A. Campbell, Mark A. Spalding, May 2015

The melting process in single-screw extruders produces the first level of mixing and is referred here as primary mixing. Secondary levels of mixing are then provided by common mixing devices. These mixing processes will be reviewed in this paper.

Improving the Physical Properties and Versatility of PLA with PHA Copolymer Blends
Michael Andrews, Allen Padwa, Zhiguan Yang, May 2015

Blends of 100% biobased, fully biodegradable amorphous polyhydroxyalkanoate (a-PHA) copolymers and polylactic acid (PLA) exhibit good toughness and clarity in injection molding, extruded sheet and blown film. It will be shown that the level of toughness increase and modulus reduction can be tuned by blend composition. Results will also be presented that show that the addition of only 5% a-PHA significantly modifies the behavior of PLA in cutting and trimming typical of thermoforming operations.

Light Weighting in Blow Molding using New Mucell Technology
Simon Dominey, May 2015

By working together with Unilever, Mucell has developed the cutting-edge technology of light-weighting of blow molded bottles by 15%

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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.

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