Optimisation of location and dimension of SMC precharge in compression moulding process

2011 ◽  
Vol 89 (15-16) ◽  
pp. 1523-1534 ◽  
Author(s):  
Moo-Sun Kim ◽  
Woo Il Lee ◽  
Woo-Suck Han ◽  
Alain Vautrin
Keyword(s):  
Compression Moulding ◽  
Moulding Process

Effect of Cobalt Stearate and Vegetable Oil on Uv and Biodegradation of Linear Low-Density Poly(Ethylene)-Poly(Vinyl Alcohol) Blends

2011 ◽  
Vol 2 (4) ◽  
pp. 131-148 ◽  
Author(s):  
Francis Vidya ◽  
Subin S. Raghul ◽  
Sarita G Bhat ◽  
Eby Thomas Thachil
Keyword(s):  
Vegetable Oil ◽  
Vinyl Alcohol ◽  
Water Soluble ◽  
Poly Vinyl Alcohol ◽  
Low Density ◽  
Compression Moulding ◽  
Melt Mixing ◽  
Degradation Behaviour ◽  
Moulding Process ◽  
Poly Ethylene

The main objective of this study was to enhance the rate of UV and biodegradation of polyethylene by incorporating biodegradable materials and prooxidants. Prooxidants such as transition metal complexes are capable of initiating photooxidation and polymer chain cleavage, rendering the product more susceptible to biodegradation. In this work, the effect of (1) a metallic photoinitiator, cobalt stearate, and (2) different combinations of cobalt stearate and vegetable oil on the photooxidative degradation of linear low-density poly(ethylene)-poly(vinyl alcohol) (LLDPE/PVA) blend films has been investigated. For this, film-grade LLDPE was blended with different proportions of PVA. PVA is widely used in the industrial field, and recently it has attracted increasing attention as a water-soluble biodegradable polymer. Cobalt stearate and vegetable oil were added to the blends as prooxidants. The blends were prepared by melt mixing in a Thermo HAAKE Polylab system. Thin films containing these additives were prepared by a subsequent compression moulding process. The effect of UV exposure on LLDPE/PVA films in the presence as well as absence of these additives was investigated. Tensile properties, FTIR spectra, and scanning electron microscopy (SEM) were employed to investigate the degradation behaviour. It was found

scholarly journals Mechanical Characteristics of Aluminium Powder Filled Glass Epoxy Composites

2017 ◽  
Vol 12 ◽  
pp. 1-14 ◽  
Author(s):  
Pujan Sarkar ◽  
Nipu Modak ◽  
Prasanta Sahoo
Keyword(s):  
Mechanical Characteristics ◽  
Tensile Modulus ◽  
Epoxy Composites ◽  
Aluminium Content ◽  
Compression Moulding ◽  
Moulding Process ◽  
Aluminium Powder ◽  
Void Fractions ◽  
Aluminium Addition ◽  
Powder Addition

Mechanical characteristics of glass epoxy and aluminium powder filled glass epoxy composites are experimentally investigated using INSTRON 8801 testing device as per ASTM standards. With a fixed wt% of fiber reinforcement, glass epoxy and 5-15 wt% aluminium powder filled glass epoxy composites are fabricated in conventional hand lay-up technique followed by light compression moulding process. Experimental results show that aluminium powder as a filler material influences the mechanical properties. Density and void fraction in composites increase whereas steady decrease of tensile strength is recorded with aluminium powder addition. Micro hardness, flexural strength, inter laminar shear strength (ILSS) of 5 and 10 wt% aluminium content composites are improved compared to unfilled glass epoxy composite and with further addition of aluminium up to 15 wt% decreasing trends are observed. Glass epoxy with 5 wt% aluminium concentration shows the highest improvement. Tensile modulus for aluminium addition of 5 wt% decreases whereas 10 wt% aluminium filled composite shows improvement in tensile modulus. These are explained on the basis of material properties, void fractions and bonding strength among the constituents.

Experimental investigations and optimization of processibility of sheet moulding compound

2011 ◽  
Vol 31 (2-3) ◽  
Author(s):  
Bhaskara J.C. Babu ◽  
Sachin Waigaonkar ◽  
Amit Rajput
Keyword(s):  
Penetration Depth ◽  
Flow Behavior ◽  
Glass Fibers ◽  
Zinc Stearate ◽  
Experimental Investigations ◽  
Compression Moulding ◽  
Maturation Time ◽  
Moulding Process ◽  
Moulding Compound ◽  
Sheet Moulding Compound

Abstract Sheet moulding compound (SMC) is a combination of glass fibers and filled polyester resin. It is processed by a compression moulding process and finds extensive applications in structural, automotive, electrical and electronic industries. The compression moulding process is characterized by the flow behavior of SMC under heat and pressure in the press mould. This paper is focused on the prediction of ideal processibility conditions of SMC. The qualitative aspect of a properly thickened (matured) moulding compound could be seen from its tack-free nature, which was quantitatively calibrated in terms of penetration depth, measured by a specially constructed softness indicator. The weight (wt)% of calcium carbonate (CaCO3) as filler, magnesium oxide (MgO) as thickener, graphite (C) and zinc stearate [Zn (C18H35O2)2] (ZnSt) as lubricants along with the maturation time (Tm) were selected as process variables. Taguchi’s scheme of experimental design was adapted to perform the experiments. It was found that the higher levels of MgO and CaCO3 were favorable for a good penetration depth as well as a reduced maturation time. We have also found that a penetration depth of at least 5 mm was required for achieving good processability conditions of SMC. An optimization study was under taken to find the right blend of additives and fillers, at their minimal weights and in the least possible maturation time, to achieve the desired processability. This study is particularly useful in a production run to make moulded parts from SMC.

Direct Moulding of Rubber Granules and Powders from Tyre Recycling

2013 ◽  
Vol 371 ◽  
pp. 315-319 ◽  
Author(s):  
Fabrizio Quadrini ◽  
Denise Bellisario ◽  
Loredana Santo ◽  
Ivica Hren
Keyword(s):  
Tensile Tests ◽  
Compression Moulding ◽  
Moulding Process ◽  
Particle Properties ◽  
Bound Rubber ◽  
Sample Density ◽  
Rubber Particles ◽  
Moulding Pressure ◽  
One Year ◽  
First Time

SMART project (Sustainable Moulding of Articles from Recycled Tyres) is a research project financed by the European Commission with the aim of developing a new moulding process of granules and powders from tyre recycling without any addition of virgin rubber or linking agent. The so called “direct moulding” is a compression moulding process which is directly applied to rubber particles from tyre grinding. After one year of activities, the new moulding process has been deeply investigated and some results are reported in the current work for the first time. Rubber granules and powders were produced by GumiImpex (partner of the European project) thanks to different technologies: particles from tyre grinding and buffings from tyre machining. Different size distributions of rubber particles and buffings were used to produce rubber sheets with the size of 200x200x5 mm3at the temperature of 160°C and the pressure of 3 MPa by using aluminium moulds. Tensile specimens were extracted from the sheets and tensile tests were performed and related to sample density and particle properties. Rubber densities over 1 g/cm3have been reached for all the samples with ultimate tensile strength and maximum elongation up to 1 MPa and 80%, respectively. These mechanical data are very promising in comparison with properties of polyurethane bound rubber composites. Increasing moulding pressure and temperature would lead to higher mechanical properties, if necessary.

scholarly journals Design of mesoporous carbon fibers from a poly(acrylonitrile) based block copolymer by a simple templating compression moulding process

Polymer ◽  
2010 ◽  
Vol 51 (14) ◽  
pp. 2965-2971 ◽  
Author(s):  
Jean-Michel Thomassin ◽  
Antoine Debuigne ◽  
Christine Jérôme ◽  
Christophe Detrembleur
Keyword(s):  
Block Copolymer ◽  
Carbon Fibers ◽  
Mesoporous Carbon ◽  
Compression Moulding ◽  
Moulding Process ◽  
Poly Acrylonitrile

scholarly journals DC Conductivity Measurements of LDPE: Influence of Specimen Preparation Method and Polymer Morphology

2017 ◽  
Author(s):  
M. Karlsson ◽  
Xiangdong Xu ◽  
K. Gaska ◽  
Henrik Hillborg ◽  
Stanislaw Gubanski ◽  
...  
Keyword(s):  
Dc Conductivity ◽  
Specimen Preparation ◽  
Direct Compression ◽  
Conductivity Measurements ◽  
Sample Processing ◽  
Compression Moulding ◽  
Moulding Process ◽  
First Case ◽  
The Difference ◽  
Institute Of Technology

<p>DC conductivity measurements are important for gaining fundamental understanding of conduction mechanisms of insulation materials, as well as in the development of HVDC power system components, such as extruded cable systems. In this study, the influence of sample processing on the morphology and DC conductivity of low-density polyethylene (LDPE) has been studied. Direct compression moulding of LDPE pellets is commonly used in research laboratories for obtaining plaque samples, whereas extrusion is an additional commonly used technique for dispersion of particles in nanocomposites prior to the compression moulding process. In this study LDPE plaques have been obtained by either compression moulding directly from pellets, or by extrusion followed by compression moulding. The morphology obtained in the first case consisted of banded spherulites, whereas the latter method yielded a morphology of small axialites. The difference in sample processing had also an impact on the DC conductivity. The DC conductivity at 22 ­ºC and 3.3 kV/mm was of the order of 4xE-18 S/m for the plaques obtained by extrusion and compression moulding whereas the plaques obtained by direct compression moulding exhibited a conductivity of 1xE-16 S/m. In addition, the reproducibility of the performed DC conductivity measurements was also verified in a round robin test performed between the Royal Institute of Technology and Chalmers Technical University.</p>

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