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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We investigate the viscoelastic properties of chain molecules (n-hexadecane) under steady state and oscillatory shear flow of ultra thin films by molecular dynamics simulation. The stress vs. strain rate diagram of the oscillatory shear flow system is used to determine the range of linear viscoelasticity. In addition interfacial slip is observed and discussed in both cases. The critical shear stress at which slip occurs is also found in our simulation.
Erika Palacios-Aguilar , Leonardo Cortés-Rodríguez , Jaime Bonilla-Ríos, May 2008
Several HDPE resins with different bubble film stability were tested in a melt flow indexer using the typical die (L = 8 mm D = 2.095 mm) and a zero die (L = 1.3 mm D = 2.095 mm) at two different loads (21.6 kg and 5 kg). A direct correlation was found between the MFI results and the bubble stability.
Erika Palacios-Aguilar , Leonardo Cortés-Rodríguez , Jaime Bonilla-Ríos, May 2008
Several HDPE resins with different bubble film stability were tested in a melt flow indexer using the typical die (L = 8 mm, D = 2.095 mm) and a zero die (L = 1.3 mm, D = 2.095 mm) at two different loads (21.6 kg and 5 kg). A direct correlation was found between the MFI results and the bubble stability.
Many injection molded part defects are caused by
improper screw designs. Elimination of the defect and
optimization of the process can often be performed via
simple modifications to the screw. A case study is
presented where a splay defect was caused by a screw with
a low compression ratio with regions where resin can
stagnate and degrade and with a limited melting capacity.
Modification of the screw eliminated the defects and
decreased the cycle time by 8% an improved the plant
capacity by 14%.
Many injection molded part defects are caused by improper screw designs. Elimination of the defect and optimization of the process can often be performed via simple modifications to the screw. A case study is presented where a splay defect was caused by a screw with a low compression ratio, with regions where resin can stagnate and degrade, and with a limited melting capacity.Modification of the screw eliminated the defects and decreased the cycle time by 8% an improved the plant capacity by 14%.
An engineering approach for the design of
plasticating screws is presented with a case study. The
approach uses a combination of experimental data and
numerical simulations.
An engineering approach for the design of plasticating screws is presented with a case study. The approach uses a combination of experimental data and numerical simulations.
The hydrolysis of polycarbonate (PC) is compared to
polybutylene terephthalate (PBT). Phosphorus additives
are shown to accelerate PC hydrolysis. Polycarbonate
polyester (PEC) copolymers hydrolyze faster than PC
however hydrolysis of the copolymer can be retarded by
addition of a hydro stabilizer. Color clarity and
mechanical properties are retained.
The hydrolysis of polycarbonate (PC) is compared to polybutylene terephthalate (PBT). Phosphorus additives are shown to accelerate PC hydrolysis. Polycarbonate polyester (PEC) copolymers hydrolyze faster than PC, however hydrolysis of the copolymer can be retarded by addition of a hydro stabilizer. Color, clarity and mechanical properties are retained.
The morphology of microcellular injection molding is
investigated for different materials at different processing
conditions in current available equipments. Several
morphology models are proposed based on this study.
The conclusions provide the guidelines to select the best
processing parameters for different materials to make the
good morphology of microcellular foam by injection
molding with the minimum material property changes.
The morphology of microcellular injection molding is investigated for different materials at different processing conditions in current available equipments. Several morphology models are proposed based on this study.The conclusions provide the guidelines to select the best processing parameters for different materials to make the good morphology of microcellular foam by injection molding with the minimum material property changes.
The warpage of an injection molded part was
predicted by CAE injection molding simulation software
using mid-plane Fusion and true three-dimensional
analyses. An Arburg 320S Allrounder 55 ton injection
molding machine was used for producing parts. The part
deformation was then measured on a CMM. The
predicted part warpage among three mesh models was
compared to the measurement of part deformation. It was
found that the predicted part warp using the true threedimensional
model was in a good agreement with the
measurement of the part.
The warpage of an injection molded part was predicted by CAE injection molding simulation software using mid-plane, Fusion and true three-dimensional analyses. An Arburg 320S Allrounder 55 ton injection molding machine was used for producing parts. The part deformation was then measured on a CMM. The predicted part warpage among three mesh models was compared to the measurement of part deformation. It was found that the predicted part warp using the true three-dimensional model was in a good agreement with the measurement of the part.
The family of biobased polymers is ever growing in
number and in popularity and the extruder/screw
manufacturing businesses need to keep abreast of the
machinery requirements of these polymers to insure that
efficient processing is understood. This paper will look at
the extrusion parameters and logic that are important to
determining the most efficient screw designs and
extrusion operating conditions for processing
biopolymers. Vented and non-vented operation will be
discussed. PLA data will be used as the basis for the
conclusions.
The family of biobased polymers is ever growing in number and in popularity and the extruder/screw manufacturing businesses need to keep abreast of the machinery requirements of these polymers to insure that efficient processing is understood. This paper will look at the extrusion parameters and logic that are important to determining the most efficient screw designs and extrusion operating conditions for processing biopolymers. Vented and non-vented operation will be discussed. PLA data will be used as the basis for the conclusions.
Multi wall carbon nanotubes (MWNT) range 1, 3 & 5 wt% were used in the blend of poly (ether imide) and poly (ether ether Ketone). Differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA) were used to investigate the changes in glass transition temperature. The dynamic mechanical behavior of polymer blends was found to be affected by the nanotubes inclusion, dispersion and interaction between the compositions. At high filler inclusion, nanotubes align anisotropic during injection molding processing possibly due to the high melt viscosity of the final composition.
David J. Walsh , Andrew Smillie , Christina Troeltzsch, May 2008
When Entira™ antistatic agents are used in the
internal layer of a multilayer film structure the measured
surface resistivity will be higher than when it is used in a
surface layer. However the static decay times of the film
are unchanged and the film retains its antistatic properties
as evidenced by for example its resistance to dust pick
up. This is an attractive solution in applications which are
hyper-sensitive to risk of contamination since the contact
layer can be a pure polyolefin.
David J. Walsh , Andrew Smillie , Christina Troeltzsch, May 2008
When Entira antistatic agents are used in the internal layer of a multilayer film structure, the measured surface resistivity will be higher than when it is used in a surface layer. However the static decay times of the film are unchanged, and the film retains its antistatic properties as evidenced by, for example, its resistance to dust pick up. This is an attractive solution in applications which are hyper-sensitive to risk of contamination since the contact layer can be a pure polyolefin.
Polyoxymethylene (POM) commonlyreferred to as acetal or polyacetal wascommercially introduced to the rotationalmolding markets in 2006. This presentation willprovide an introduction to POM that includesfeatures and properties processing guidelines andmarket applications.
Linus Leung , Christine Chan , Soo Baek , Hani Naguib, May 2008
In this study bioscaffolds using poly (DL-lactide-co-glycolide) acid (PLGA) were studied. The gas foaming/ salt leaching technique in a batch setup was employed. The effects of material composition on the morphology and mechanical properties using this process were investigated. Characterization of scaffolds fabricated with PLGA 85/15 and 50/50 showed that lower relative density was achieved with an increasing poly(DL-lactide) acid content. Furthermore the effect of PLGA composition on modulus of the scaffolds was minor.
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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