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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The history and growth of the Journal of Plastic Film and Sheeting which was founded by James P. Harrington in 1984 will be reviewed along with a film technology overview.
In order to understand membrane transport and thereby develop suitable membranes for protection and separation, there are a few characteristics of the membrane and the diffusing constituents that must be known. These include the molecular states of the diffusing components, their diffusion coefficients, permeabilities and the membrane selectivity. In general, the fundamental physical property required to design and optimize polymers used as barrier and membranes is the mutual diffusion coefficient.
A test method for evaluating the chemical compatibility of plastic pipe has been developed. It is a simple extension of the tensile creep rupture method to ring samples excised from pipes. Simple mechanics equations are used to determine the load required to match the stress to that of a pressurized pipe. Analysis and results of demonstration experiments are provided. This method has the advantage of simulating the real application more realistically than a displacement-controlled test.
TE Connectivity conducted a joint effort with the Nation Research Council of Canada to investigate using ultrasonic measurement techniques to determine filler concentrations during the extrusion process. The results of that project are presented here. Ultrasonic attenuation and velocity are sensitive to several extrusion factors such as pressure, extrusion rate, carrier material, and filler concentration. We have demonstrated the ability to detect relative changes from a process baseline. The technique shows promise for more improvements.
The study includes two fillers (wheat straw and talc; from 20 to 40wt %) and two polypropylenes (homopolymer and impact copolymer). The combined effect of the fillers at 30wt % was also evaluated. Mechanical properties and density were measured. The flexural modulus increased with filler level. In case of polypropylene copolymer, increasing the percentage of filler/fiber decreased the impact strength of the composite. Each filler had a different contribution to the specific flexural modulus.
K-ionomer antistatic agent is highly effective in polyolefin host resins. In addition to the many unique features it imparts to the end-uses, the K-ionomer shows good compatibility with polyolefins and is easy to process. This paper presents an in-depth discussion on several material and processing factors that need to be properly controlled in order to achieve a favorable blend morphology and further improve the antistat performance.
In plastics processing industry does exist the trend of miniaturization. Control of all production parameters, especially control of pressure, plays a decisive role influencing the quality of products produced with injection molding and extrusion. When downscaling the size of products to microproducts control of pressure gets more important and difficult. This work investigates the possibility to apply the Bagley correction in microchannels to determine the drop of pressure in cross-section reductions without using pressure sensors.
Molding shops and mold builders realize more and more that the continued practice of a re- active “fixes it when it breaks” maintenance strategy is an exercise in futility. Excessive tooling and labor costs, missed production shipments and repeating part quality issues caused by knee jerk solutions and quick, cheap repairs stifle company growth. Changing a long standing re-active maintenance culture involves understanding the “5 factors of focus” that control tool room performance.
Thermoforming is an economical process for forming large shape products. High performance liquid crystal polymer (LCP) has high thermal stability, excellent dimensional stability and high chemical resistance, which offers new application opportunities in demanding applications. In this paper, a new thermoformable LCP resin is compared with injection molding LCP on mechanical, thermal and rheological properties. Sheet extrusion and thermoforming process conditions are discussed.
The effects of cooling rate on gas penetration depth and residual wall thickness (RWT) of gas-assisted injection molding (GAIM) parts was investigated for polypropylene (PP) and for stainless steel powder feedstock (SSPF). Gas penetration depth and RWT of PP in SLA and in Al cavities did not show any significant difference. However, gas penetration and fingering of SSPF in SLA and in Al cavities were found to be different.
In this study, the long GFR-PPS and short and long GFR-SPS were tested to evaluate the long-term performance at the elevated temperature in water and in air. As a result, tensile strength of there after 10000 hours at 150°C in hot water decreased to 60% or less due to degradation at the interface between matrix resin and GF.
This research was performed to compare mechanical properties of wood-plastic composites based on PLA and PLA/PBS blend. Wood-plastic composites were prepared by melt compounding 70 wt% plastics; PLA, PLA/PBS 70:30 wt% blend, or PP; and 30 wt% pine wood fibers. A suitable coupling agent was used to improve compatibility between polymer matrix and wood fibers. Tensile, flexural, impact and fracture toughness were evaluated and compared. Phase dispersion and interfacial adhesion was studied by SEM.
Properly used and maintained Porcerax II, the self venting mold steel, will allow molders to reduce cycle times, injection pressure and scrap due to short shots, sink, and material burning. Design considerations should include: 1. Resins used 2. Surface finish of plastic part required 3. Size of problem area 4. Proper thickness of insert 5. Proper venting on cavity and backside of insert for optimal venting. 6. Molding vertical walls with Porcerax II 7. Ability to remove the insert for periodic cleaning
This research was evaluated the adsorption and barrier properties of PET, PP. The results showed that MVTR of the blend samples decreased with increasing PP contents while the residual rate of L-menthol decreased when increasing PP contents in blend. Therefore, the adsorption amount of a model compound, L-menthol tended to increase with increasing PP contents in the blends. However, the barrier effectiveness of the blends has been improved by the contribution of the PP.
Three general purpose polycarbonate (PC) resins and one PC-siloxane copolymer were injection molded, then exposed to isopropyl alcohol (IPA), hand lotion, and SPF 30 sunscreen while under strain. The hand lotion exhibited the most aggressive environmental stress cracking (ESC) behavior. Effects of molecular weight, polymer composition and annealing are addressed. Scanning electron microscopy of an ESC fracture surface is also presented.
Nanocomposites of HNBR latex and modified clays were prepared by latex blending. The results of x-ray diffraction show that using a reswell technique with trisilanolphenyl POSS with MMT and rubber provides a large d-spacing as well as a mainly exfoliated structure. Modified clay in the latex affords no change in thermal degradation temperature. POSS modified clays successfully provide thermal stability and an intercalated or exfoliated structure when mixed with latex rubber.
This study was carried out to clarify a relationship between moisture absorption fraction and higher-order structure of dry-less recycled PET pellets. Karl Fischer moisture titration, differential scanning calorimetry (DSC), microscopic Raman spectroscopy and scanning electronic microscope (SEM) were used to characterize the pellets to determine distinct structures that differentiates the dry-less pellets with normal pellets.
Manufacturing spherical polymer micropellets has been possible with a new technique that uses air to impose surface disturbances on an extrudate. Observations of experimental results considering properties of the melt are taken as the starting point for a deeper understanding of the behavior of polymer resins of interest in the production of micropellets. Such relationships include aspects of material properties as well as processing conditions.
On September 16, 2011, the President of the United States signed into law the Leahy-Smith America Invents Act. This law includes some of the most significant changes to U.S. Patent Law since the early 1950’s, changing the U.S. patent system to a “first to file” system. The Act also introduces procedures, such as post grant review and supplemental examination, and alters existing procedures such as inter-partes re-examination.
This paper presents the possibility of using natural fiber as reinforcement for engineering thermoplastics composite. Jute mats from waste coffee bag were treated by thermoset resin such as flexible epoxy resin (FE) to improve their thermal resistance prior to compression mold with polycarbonate (PC). The effects of epoxy contents on thermal properties and mechanical properties of the composites were investigated.
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.
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