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Issues and Challenges in the Malaysian Economy
Type: Book
ISBN: 978-1-83867-482-3

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Article
Publication date: 28 July 2020

Zheng Zhang, Yanbao Guo, Wanjun Li, Deguo Wang and Yongjie Zhou

The exploration of the polar regions is of immeasurable potential. It brings great challenges to tribology in the extreme environment. Moreover, the static friction force…

Abstract

Purpose

The exploration of the polar regions is of immeasurable potential. It brings great challenges to tribology in the extreme environment. Moreover, the static friction force is an essential index of the braking performance. The purpose of this paper is the static friction force between the rubber of marine pipe tensioner and the ice bead.

Design/methodology/approach

The frictional phenomena were studied for rubber-ice bead at different contact positions (front edge, front part and end part) by means of image processing and measuring. Also, the image sequences of the contact were combined with friction force and displacement data.

Findings

As rubber across the ice bead, the forces of rubber and ice bead at different contact positions determined the order of static friction force (front edge > front part > end part). Meanwhile, there were two different contact states in this process. In addition, under the low tangential load growth rate, the higher temperature can increase the static friction force by increasing the viscoelasticity and contact area of rubber.

Originality/value

The research on the static friction of rubber-ice bead leads to more controlled and higher friction levels during marine pipeline laying.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-12-2019-0526/

Details

Industrial Lubrication and Tribology, vol. 73 no. 1
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 1 August 1941

T.L Garner

THE term synthetic rubber is strictly related only to a product which is physically and chemically indistinguishable from natural rubber; no material has been developed…

Abstract

THE term synthetic rubber is strictly related only to a product which is physically and chemically indistinguishable from natural rubber; no material has been developed fitting such a definition and synthetic substances which possess properties approximating to those of the natural product are generally regarded as synthetic rubbers. More exact definition has been attempted by many authors in particular to so‐regard only those products which are capable of vulcanization, thus turning from plastic to clastic bodies. No new word describing the synthetic bodies has been accepted and it will now prove difficult to divorce the term “synthetic rubber” from any material showing reasonably comparable properties with natural rubber.

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Aircraft Engineering and Aerospace Technology, vol. 13 no. 8
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 16 July 2019

Fuying Zhang, Hao Che Shui and Yufei Zhang

The purpose of this paper is based on the response surface method, the authors determined the conditions for achieving the optimum rubber-sealing performance by using the…

Abstract

Purpose

The purpose of this paper is based on the response surface method, the authors determined the conditions for achieving the optimum rubber-sealing performance by using the maximum contact stress as the response value.

Design/methodology/approach

A two-dimensional model of a compression packer rubber was established by finite-element analysis software. Under the single axial load of 53.85 MPa, the four single factors of the end-face inclination angle, subthickness, height of rubber and friction coefficient of the rubber were analyzed.

Findings

Results show that the optimum sealing performance of the rubber tube is achieved when the end-face angle is equal to 45º and the thickness of the rubber tube is 9 mm. The response surface designed by Box–Behnken shows that the sealing performance of the rubber tube is the optimum when the end-face inclination angle is 48.1818°, the subthickness is 9 mm, the height of rubber is 90 mm and the friction coefficient is 0.1. Verification test results show that the model is reliable and effective.

Originality/value

Packer operations are performed downhole, and research on real experiments is limited. In this work, the feasibility of such experiments is determined by comparing finite-element modeling with actual experiments, and the results have guiding significance for actual downhole operations.

Details

Industrial Lubrication and Tribology, vol. 71 no. 5
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 1 November 1991

S.M. El‐Sawy and M. Helaly

Rubber gaskets find wide applications in steel structures. Gaskets are usually used on the edges or on the nail hole positions. These are the weakest positions, where…

Abstract

Rubber gaskets find wide applications in steel structures. Gaskets are usually used on the edges or on the nail hole positions. These are the weakest positions, where corrosion starts, whether the structure is protected by paint or by other methods. In this work, anticorrosive pigments were incorporated in rubber formulations. They are tested by corrosion protection when used as gaskets with steel panels. Results showed that the presence of anticorrosive pigments in rubber gaskets prevents early rusting under it in comparison with the blank. Zinc‐tetroxy chromate pigment exhibited the highest rust inhibiting power when chloroprene rubber formulations were used. The change of the pigment percent barely affect the quality of protection when syrenebutadiene rubber formulation were used. Zinc tetroxy chromate pigment improved the physico‐mechanical properties of chloroprene rubber under investigation. The used formulations can tolerate thermal oxidative aging at 90°C up to 8 days. The rate of vulcanization was not affected by increasing the concentration of the inhibitive pitments.

Details

Anti-Corrosion Methods and Materials, vol. 38 no. 11
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 February 1937

T.L. Garner

RUBBER used for aircraft purposes must be of high quality, and this factor must overrule anything else in the production of the necessary parts. The materials used in…

Abstract

RUBBER used for aircraft purposes must be of high quality, and this factor must overrule anything else in the production of the necessary parts. The materials used in compounding arc the best procurable, and control tests arc operated at suitable points during the manufacturing process to ensure the maintenance of a consistent standard.

Details

Aircraft Engineering and Aerospace Technology, vol. 9 no. 2
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 May 1991

Edgar S. Lower

A number of derivatives of vegetable and animal oils and fats are useable in the processing of rubbers, including fatty acids, fatty acid amides, amines, metallic soaps…

Abstract

A number of derivatives of vegetable and animal oils and fats are useable in the processing of rubbers, including fatty acids, fatty acid amides, amines, metallic soaps, and sulphur containing materials, etc.

Details

Pigment & Resin Technology, vol. 20 no. 5
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 1 June 1991

Edgar S. Lower

Polyoxyethylated hydroxy benzyl oleamide has found use in lubricants to prevent adhesion in moulds during the production of vulcanizates of natural and of synthetic rubbers

Abstract

Polyoxyethylated hydroxy benzyl oleamide has found use in lubricants to prevent adhesion in moulds during the production of vulcanizates of natural and of synthetic rubbers. Polyoxyethylated oleamide acts as a mould lubricant for synthetic rubbers, whilst polyglycol 400 dilaurate can be used to reduce the time and temperature necessary for the recovery of old vulcanizates using paraffin oil and bitumen. Anti‐fogging properties can be sustained in rubber hydrochloride films by the use of polyglycol 1500 dilaurate, and improved percentage elongation can be promoted in intimate blends of polystyrene and SBR rubbers by the inclusion of polyglycol 4000 monostearate. Polyoxyethylated sorbitan monostearate acts as an emulsifer in the emulsion polymerisation of styrene, butadiene and styrene/ butadiene copolymer rubbers, and it can perform as an anti‐static for the latter. Polyoxyethylated stearylamine can be incorporated into lubricants designed to prevent adhesion in moulds during production of vulcanizates of synthetic and of natural rubber, and rubber latexes and other aqueous dispersions of rubber can be rendered more stable by the employment of polyoxyethylated stearyl alcohol, and thus allow storage in untreated containers for long periods of time. Polyoxypropylated sorbitan monopalmitate will serve as a parting agent, releasing aid, for unvulcanized rubber and vulcanized rubber, without interfering with further bonding and coating of rubber.

Details

Pigment & Resin Technology, vol. 20 no. 6
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 4 March 2014

You-Qiang Wang, Xiu-Jiang Shi and Li-Jing Zhang

Water-lubricated rubber bearing is one of the most appropriate bearings for underwater use. The most popular design used widely today is the straight fluted rubber

Abstract

Purpose

Water-lubricated rubber bearing is one of the most appropriate bearings for underwater use. The most popular design used widely today is the straight fluted rubber bearing. The special configuration leads to partial hydrodynamic lubrication and low load capacity. A new bearing bush structure with two cavities which is favorable for constructing continuous hydrodynamic lubrication was designed and studied. The paper aims to discuss these issues.

Design/methodology/approach

A new bearing bush structure with two cavities which is favorable for constructing continuous hydrodynamic lubrication was designed. The apparatus for studying the tribological behaviors of the two types of water-lubricated rubber bearings has been devised and established in the paper. The experimental studies on the tribological properties of the rubber bearings have been conducted under different loads and velocities. The eccentricity ratio of the new structure rubber bearing with two cavities was measured in experiment and the load capacity was calculated by numerical simulation.

Findings

The experimental results show that the friction coefficient decreases with increasing velocity; the friction coefficient increases sharply with the rising temperature, the friction coefficient increases at first and then decreases with increasing load for fluted rubber bearings. The numerical results were in good agreement with the experimental results. The numerical results show that complete hydrodynamic lubrication can be formed in the new designed rubber bearing with two cavities. The experimental and numerical results all indicate that there is an appropriate bearing clearance which the friction coefficient is minimum and the load capacity is maximum.

Originality/value

A new bearing bush structure with two cavities which is beneficial to constructing continuous hydrodynamic lubrication film was designed. A new apparatus for studying the tribological behaviors of the two types of water-lubricated rubber bearings has been devised and established. Experimental and numerical study on the new structure rubber bearing were conducted in the paper.

Details

Industrial Lubrication and Tribology, vol. 66 no. 2
Type: Research Article
ISSN: 0036-8792

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Book part
Publication date: 25 June 2016

Juan Velez-Ocampo, Carolina Herrera-Cano and Maria Alejandra Gonzalez-Perez

The purpose of this chapter is to analyse the possible causes of the Peruvian Amazon Company’s death.

Abstract

Purpose

The purpose of this chapter is to analyse the possible causes of the Peruvian Amazon Company’s death.

Methodology/approach

This study uses secondary sources to document the trajectory of the Peruvian Amazon Company, the rubber export boom, and the different market forces affecting the wild rubber industry. By examining different sources that document the case of the Peruvian Amazon Company and the wild rubber extraction in the Amazon, this text aims to analyse the possible causes of the Peruvian Amazon Company extinction.

Findings

After analysing the existing literature on the Peruvian Amazon Company and the wild rubber industry, it was possible to find evidence about the problems related with land ownership, labour and international prices, along with the internationally known scandals, as the principal causes of the company’s death.

Practical implications

The case of the Peruvian Amazon Company, explores how an unsustainable business model could eventually lead a once successful company to its death. The contribution of the following chapter is based on the description of the causes of the Peruvian Amazon Company’s death. Previous studies had analysed the internationalization strategies implemented by the company. Although, an evaluation of causes of the company’s real extinction had not been presented.

Details

Dead Firms: Causes and Effects of Cross-border Corporate Insolvency
Type: Book
ISBN: 978-1-78635-313-9

Keywords

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