A New Approach for Resin Selection in Rotational Molding

Waigaonkar, Sachin; Babu, B.J.C.; Prabhakaran, R.T. Durai

doi:10.1177/0731684407086629

Cited by 14 publications

(6 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…11,12 The recent developments made on the rotational molding machines allow, now, to consider the production of economically attractive technical pieces satisfying the requirements of many sectors, very demanding on the piece quality, such as automotive, civil engineering, or even sport and leisure. 13 In some cases of figure, rotational molding became an interesting alternative to extrusion blowing. etc.…”

Section: Introductionmentioning

confidence: 99%

Kinetic modeling of polypropylene thermal oxidation during its processing by rotational molding

Sarrabi

Colin

Tcharkhtchi

2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

ABSTRACT:The main drawback of rotational molding is a long stay (several dozens of minutes) of polymer in melt state at high temperature in atmospheric air. To prevent any significant polymer thermal degradation, it is necessary to define, preliminary, a processing window in a temperature-molar mass map. The objective of this article is to elaborate and check the validity of a general thermal degradation model devoted to determine, in a near future, some important boundaries of this processing window. This model is composed of two distinct levels: (i) The first level is derived from the thermal transfer mechanisms occurring during a processing operation, polymer phase changes (i.e., melting and crystallization) being simulated by the enthalpy method; and (ii) The second level is derived from the oxidation mechanistic scheme of free additive polymer in melt state established in a previous study, but completed, here, by adding the main stabilization reactions of a common synergistic blend of antioxidants, widely used for rotational molding polymer grades. By juxtaposing such ''thermal'' and ''chemical'' levels, it is possible to predict the polymer thermal degradation during a whole processing operation. The validity of both levels is successfully checked in real rotational molding conditions for polypropylene (PP). V C 2010 Wiley Periodicals, Inc. J Appl Polym Sci 118: [980][981][982][983][984][985][986][987][988][989][990][991][992][993][994][995][996] 2010

show abstract

Section: Introductionmentioning

confidence: 99%

Kinetic modeling of polypropylene thermal oxidation during its processing by rotational molding

Sarrabi

Colin

Tcharkhtchi

2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The process is often called sintering and densification in the literature and constitutes the fundamental mechanisms by which parts are formed in RM [4][5][6]. This stage constricts the materials' suitability as the candidates need to comply with specific conditions (such as thermal stability) to form the part successfully [7,8]. Therefore, in order to strengthen parts in RM, it is necessary to study these phenomena.…”

Section: Introductionmentioning

confidence: 99%

Densification of fibre-reinforced composite polymers under rotational moulding conditions

Castellanos

Martin

McCourt

et al. 2022

Plastics, Rubber and Composites

View full text Add to dashboard Cite

The present work investigated the effect of fibre's presence on the densification of rotomoulding-grade polyethylene. Nevertheless, the presence of fibres during densification directly impacts the current understanding of how densification works during heating. The present work focuses fibre-reinforced polymer densification to study the effect of fibre addition on bubble formation during this process. A densification test was developed to observe and measure fibre addition's effect on polymer densification and bubble disappearance. The test focused on measuring the cross-section area corresponding to bubbles appearing in the melt and comparing results to clarify whether fibre addition alters this process. Results showed that, although heating parameters and particle size affect bubble morphology and disappearance, fibres' presence does not substantially affect the bubbles. Finally, results showed that polymer-fibre characterisation plays a crucial role in sintering and densification, and work is continuing to present conclusions about how sintering and densification affect the full-scale manufacturing process.

show abstract

“…4 A wide range of rotomolded composites were identified in the published articles, which used different polymers and fillers. The types of polyethylene studied include low-density polyethylene (LDPE), 3 highdensity polyethylene (HDPE), 11,12 linear mediumdensity polyethylene (LMDPE), 13,14 linear low-density polyethylene (LLDPE), 3,12,14,15 cross-linked polyethylene (XLPE), 16 and ultra-high-molecular-weight polyethylene (UHMWPE). 17 Other thermoplastic polymers used in this process are polyamide, [18][19][20][21] polycarbonate, 22 polypropylene, 18,[23][24][25][26][27][28][29] acrylonitrile butadiene styrene copolymer, 18 the ethylene-vinyl acetate, 18,30 and polyester amide copolymer.…”

Section: Introductionmentioning

confidence: 99%

Rotomolding and polyethylene composites with rotomolded lignocellulosic materials: A review

León

Escócio

Visconte

et al. 2020

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

Rotomolding is a versatile process used in the manufacture of thermoplastic polymeric materials to produce large hollow plastic parts. The aim of this review article was to discuss the rotomolding process and show the properties of the polyethylene composite and rotomolded lignocellulosic fibers, which are processed for prolonged periods under temperature. The main process parameters studied are the shaft speed of the equipment, molding temperature, polymer particle size, polymer melt flow index, and amount of material, which must be well controlled to achieve a non-degraded product with homogeneous thickness and no porosity. Rotomolded composites containing sisal, pine, coir, banana, flax, and maple wood fibers, among others, have been evaluated primarily for their mechanical (impact, flexural, and tensile strength) and morphological properties. The type, content, and treatment of lignocellulosic fillers are the most widely studied variables in polyethylene-based rotomolded composites. Fiber content was the variable that most influenced mechanical properties, particularly impact strength and hardness due to the voids formed by the hydrodynamic volume between the polymer matrix and lignocellulosic filler. Chemical treatment of the fiber by mercerization with NaOH made it more hydrophobic and the addition of maleic anhydride-grafted polyethylene as a coupling agent improved the interfacial adhesion between the non-polar polymer matrix and polar filler. However, the best mechanical property results were obtained with the use of maleic anhydride-grafted polyethylene.

show abstract

A New Approach for Resin Selection in Rotational Molding

Cited by 14 publications

References 33 publications

Kinetic modeling of polypropylene thermal oxidation during its processing by rotational molding

Kinetic modeling of polypropylene thermal oxidation during its processing by rotational molding

Densification of fibre-reinforced composite polymers under rotational moulding conditions

Rotomolding and polyethylene composites with rotomolded lignocellulosic materials: A review

Contact Info

Product

Resources

About