Reactive rotational molding

Throne, James L.; Gianchandani, J.

doi:10.1002/pen.760201309

Cited by 26 publications

(14 citation statements)

References 11 publications

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“…For example, when liquid thermosetting plastic is placed inside a rotating mould, the best quality outcome can be achieved if the distribution of the liquid is as uniform as possible. More details on this application can be found in [35]. The same problem arises in the coating of fluorescent light bulbs in which a suspension consisting of a coating solute and a solvent is placed inside a spinning glass tube.…”

Section: Introductionmentioning

confidence: 99%

On the Nature of Ill-Posedness of the Forward-Backward Heat Equation

Chugunova

Karabash

Pyatkov³

2009

Integr. equ. oper. theory

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We study the Cauchy problem with periodic initial data for the forward-backward heat equation defined by a J-self-adjoint linear operator L depending on a small parameter. The problem originates from the lubrication approximation of a viscous fluid film on the inner surface of a rotating cylinder. For a certain range of the parameter we rigorously prove the conjecture, based on numerical evidence, that the complete set of eigenvectors of the operator L does not form a Riesz basis in L 2 (−π, π). Our method can be applied to a wide range of evolution problems given by P T -symmetric operators. Mathematics Subject Classification (2000). Primary 35P10; Secondary 35Q35, 35K15, 76A20. Keywords. Viscous fluid film, forward-backward diffusion, parabolic equation of mixed type, highly non-self-adjoint differential operator, Riesz basis property, completeness.

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Section: Introductionmentioning

confidence: 99%

On the Nature of Ill-Posedness of the Forward-Backward Heat Equation

Chugunova

Karabash

Pyatkov³

2009

Integr. equ. oper. theory

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“…parts in a biaxially rotating mold In order to achieve a properly molded part, the material must be in the rubber state before gelation takes place [27]. The material reaction viscosity should increase slowly in the range within which solid body rotation occurs.…”

Section: Criterion For Producing Defect-free Apa6mentioning

confidence: 99%

Polyamide from lactams by reactive rotational molding via anionic ring-opening polymerization: Optimization of processing parameters

Barhoumi¹,

Maazouz²,

Jaziri³

et al. 2013

Express Polym. Lett.

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A reactive rotational molding (RRM) process was developed to obtain a PA6 by activated anionic ring-opening polymerization of epsilon-caprolactam (APA6). Sodium caprolactamate (C10) and caprolactam magnesium bromide (C1) were employed as catalysts, and difunctional hexamethylene-1,6-dicarbamoylcaprolactam (C20) was used as an activator. The kinetics of the anionic polymerization of !-caprolactam into polyamide 6 was monitored through dynamic rheology and differential scanning calorimetry measurements. The effect of the processing parameters, such as the polymerization temperature, different catalyst/activator combinations and concentrations, on the kinetics of polymerization is discussed. A temperature of 150°C was demonstrated to be the most appropriate. It was also found that crystallization may occur during PA6 polymerization and that the combination C1/C20 was well suited as it permitted a suitable induction time. Isoviscosity curves were drawn in order to determine the available processing window for RRM. The properties of the obtained APA6 were compared with those of a conventionally rotomolded PA6. Results pointed at lower cycle times and increased tensile properties at weak deformation

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“…For Nyrim, it is essential to have a good heating method in order to prevent problems with blockages in the feed system. 3. A nitrogen injection after each shot is a satisfactory method to purge the lines of reactants and prevent blockage of the feed system.…”

Section: Discussionmentioning

confidence: 99%

Development of reactive rotational moulding process

Corrigan¹,

Harkin‐Jones²,

Brown³

et al. 2004

Plastics, Rubber and Composites

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A recent revival of industrial interest in rotational moulding of reactive liquid polymers has led to renewed research efforts in this area of polymer processing. This paper describes the design and construction of a reactive liquid polymer feed system for use in reactive rotational moulding. This feed system allows multiple material shots to be added to the mould without the need to stop mould rotation. The paper also describes work to develop a control technique that explores the exploitation of changes in ultrasound signal properties to monitor viscosity during cure in reactive rotational moulding (RRM). Tests have been conducted on dicyclopentadiene (DCPD) in a static off-line rig, to simulate the conditions that are expected during rotational moulding. The signals propagated through the DCPD indicate a rise in ultrasonic velocity during cure, associated with mechanical property changes owing to increased crosslinking. This technique is non-intrusive, and measurements can be obtained real-time for the duration of cure.

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Reactive rotational molding

Cited by 26 publications

References 11 publications

On the Nature of Ill-Posedness of the Forward-Backward Heat Equation

On the Nature of Ill-Posedness of the Forward-Backward Heat Equation

Polyamide from lactams by reactive rotational molding via anionic ring-opening polymerization: Optimization of processing parameters

Development of reactive rotational moulding process

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