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Article
Publication date: 1 October 2018

Yunsong Shi, Wei Zhu, Chunze Yan, Jinsong Yang and Zhidao Xia

This study aims to report the preparation, selective laser sintering (SLS) processing and properties of a new nylon elastomer powder. The effects of solvent, dissolution…

Abstract

Purpose

This study aims to report the preparation, selective laser sintering (SLS) processing and properties of a new nylon elastomer powder. The effects of solvent, dissolution temperature and time and cooling method and speed on the particle size and morphologies of the prepared nylon elastomer powder are investigated.

Design/methodology/approach

The prepared nylon elastomer power possesses the particle size of around 50 mm and is spherical in shape, indicating that this study provides the feasible dissolution-precipitation process, a distillation cooling method and a suitable solvent to prepare nylon elastomer powders.

Findings

Compared to pure nylon 12, the nylon elastomer has a lower part bed temperature and a wider sintering window for the SLS process. The wider sintering window indicates the better SLS processibility. The lower part bed temperature is beneficial to the recycling of material and the decrease in the requirement of SLS equipment.

Originality/value

The nylon elastomer in this study has a lower part bed temperature and a wider sintering window for the SLS process. The wider sintering window indicates better SLS processibility. The lower part bed temperature is beneficial to the recycling of material and the decrease in the requirement of SLS equipment.

Details

Rapid Prototyping Journal, vol. 24 no. 6
Type: Research Article
ISSN: 1355-2546

Keywords

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Article
Publication date: 16 June 2010

M. Grujicic, V. Sellappan, G. Arakere, J.M. Ochterbeck, Norbert Seyr, Andreas Obieglo, Marc Erdmann and Jochen Holzleitner

The purpose of this paper is to propose and analyse computationally a new concept for mechanical interlocking between metal and plastics. The approach utilizes some of the…

Abstract

Purpose

The purpose of this paper is to propose and analyse computationally a new concept for mechanical interlocking between metal and plastics. The approach utilizes some of the ideas used in the spot‐clinching joining process and is appropriately named “clinch‐lock polymer metal hybrid (PMH) technology.”

Design/methodology/approach

A new approach, the so‐called “direct‐adhesion” PMH technology, is recently proposed Grujicic et al. to help meet the needs of automotive original equipment manufacturers and their suppliers for a cost‐effective, robust, reliable PMH technology which can be used for the manufacturing of load‐bearing body‐in‐white (BIW) components and which is compatible with the current BIW manufacturing‐process chain. Within this approach, the necessary level of polymer‐to‐metal mechanical interconnectivity is attained through direct adhesion and mechanical interlocking.

Findings

In an attempt to fully assess the potential of the clinch‐lock approach for providing the required level of metal/polymer mechanical interlocking, a set of finite‐element based sheet‐metal forming, injection molding and structural mechanics analyses is carried out. The results obtained show that stiffness and buckling resistance levels can be attained which are comparable with those observed in the competing injection over‐molding PMH process but with an ∼3 percent lower weight (of the polymer subcomponent) and without the need for holes and for over‐molding of the free edges of the metal stamping.

Originality/value

The paper presents a useful discussion of clinch‐lock joining technology's potential for fabrication of PMH load‐bearing BIW components.

Details

Multidiscipline Modeling in Materials and Structures, vol. 6 no. 1
Type: Research Article
ISSN: 1573-6105

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Article
Publication date: 1 December 1962

P.P. Benham

Since 1917 there has been much research to find means of eliminating or reducing the harmful influence of corrosion on fatigue behaviour. The solution, in principle, is to…

Abstract

Since 1917 there has been much research to find means of eliminating or reducing the harmful influence of corrosion on fatigue behaviour. The solution, in principle, is to prevent the corrosive attack on the metal surface and thus achieve something like the air fatigue strength. The studies reported here help to counter‐balance the much greater number of investigations involving various metallic types of protective coatings. They were initiated to provide information on the possibilities of using organic coatings to protect coil springs.

Details

Anti-Corrosion Methods and Materials, vol. 9 no. 12
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 2 November 2012

Preeti Singh, Sven Saengerlaub, Ali Abas Wani and Horst‐Christian Langowski

The purpose of this paper is to review the new trends in plastic additives, with special focus on developments in food packaging materials.

Abstract

Purpose

The purpose of this paper is to review the new trends in plastic additives, with special focus on developments in food packaging materials.

Design/methodology/approach

Phenomenological research has brought awareness and increased insight into the role of various plastic additives on the packaging of foods. The approach is based on the current trends and the industrial protocols for the additives used in plastic polymer processing for the development of food packaging materials.

Findings

Packaging of foodstuffs is a dynamic process which continually responds to the changes in supply and demand which are the result of adaptations to the varying demands of the consumer, changes in retail practices, technological innovations, new materials and developments in legislation, especially, with respect to environmental concerns. A wide range of additives is available for enhancing the performance and appearance of food packaging, as well as improving the processing of the compound. Polymer additives are important areas of innovation for packaging materials.

Originality/value

The paper reviews and summarizes the recent developments in the functionality of different additives, along with their advantages and disadvantages, currently being used to enhance the properties of food packaging materials that can positively influence the environment within the packaging for the increased demand for raw or processed foods.

Details

Pigment & Resin Technology, vol. 41 no. 6
Type: Research Article
ISSN: 0369-9420

Keywords

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Article
Publication date: 10 May 2021

Rhys J. Williams, Luke Fox and Candice Majewski

This study aims to demonstrate for the first time that the cheap, commodity polymer, poly(propylene), can be successfully processed using high speed sintering, and that it…

Abstract

Purpose

This study aims to demonstrate for the first time that the cheap, commodity polymer, poly(propylene), can be successfully processed using high speed sintering, and that it can be recycled several times through the process, with little to no detriment to either the polymer itself or the parts obtained. This is significant as a step towards the realisation of high speed sintering as a technology for high-volume manufacturing.

Design/methodology/approach

A poly(propylene) powder designed for laser sintering was used to build parts on a high speed sintering machine. The unsintered powder was then collected and reused. Repeating this process allowed creation of seven generations of aged powder. A variety of characterisation techniques were then used to measure polymer, powder and part properties for each generation to discern any effects arising from ageing in the machine.

Findings

It was found that poly(propylene) could be used successfully in high speed sintering, albeit with a low build success rate. Increased powder age was found to correlate to an increase in the build success rate, changes in microscopic and bulk powder properties and improvement to the dimensional accuracy of the parts obtained. By contrast, no discernible correlations were seen between powder age and polymer molecular weight, or between powder age and the tensile properties of parts.

Originality/value

This is the first report of the use of poly(propylene) in high speed sintering. It is also first study regarding powder recyclability in high speed sintering, both in general and using poly(propylene) specifically.

Details

Rapid Prototyping Journal, vol. 27 no. 4
Type: Research Article
ISSN: 1355-2546

Keywords

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Article
Publication date: 1 April 1961

The above Congress, being held at the Imperial College of Science and Technology, London, from April 10–15, has been described as likely to be the corrosion event of the…

Abstract

The above Congress, being held at the Imperial College of Science and Technology, London, from April 10–15, has been described as likely to be the corrosion event of the decade. Size alone is no criterion, though over 80 papers are being presented, but the standing of many of the corrosionists associated with the Congress is, perhaps, the best indication of the truth of this statement. Summaries and abstracts of some of the papers appear in the following pages. More will be published in next month's issue.

Details

Anti-Corrosion Methods and Materials, vol. 8 no. 4
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 15 February 2018

Paul Glovinsky and Erik Zavrel

The authors’ innovation is specially constructed sleepwear – which the authors have dubbed “Janus Sleepwear” – for the treatment of sleep disturbance caused by thermal…

Abstract

Purpose

The authors’ innovation is specially constructed sleepwear – which the authors have dubbed “Janus Sleepwear” – for the treatment of sleep disturbance caused by thermal dysregulation, a problem most often seen in women. The authors have designed and tested a simple and comfortable garment with lateralized thermal properties that promotes either thermal conduction or thermal insulation depending upon body position. This innovation will allow sleepers to auto-regulate proximal skin temperature through subtle movements during brief transient arousals, preserving overall sleep architecture. The paper aims to discuss this issue.

Design/methodology/approach

The authors have constructed several prototypes of sleepwear with lateralized thermal properties and conducted small-scale piloting of the garment. Volunteers wore the special sleepwear while awake and performed a series of controlled body position changes. Temperature at several proximal anatomical sites was monitored using temperature sensors known as iButtons.

Findings

Janus Sleepwear can facilitate more rapid cooling, compared to control sleepwear, when the conductive side faces the ambient environment and can maintain temperature with less loss of heat when the insulating side faces the ambient environment.

Originality/value

Thermoregulation plays a key role in promoting and maintaining sleep. Thermal dysregulation and sleep disturbance most commonly occur in women. Sensitivity to ambient temperature stressors suggests it may prove beneficial for such women to maintain as narrow a temperature range as possible during sleep. A person wearing Janus Sleepwear will be able to effectively “steer” her body in response to subjective and subconscious perceptions of thermal discomfort to maintain optimal conditions while asleep.

Details

International Journal of Clothing Science and Technology, vol. 30 no. 1
Type: Research Article
ISSN: 0955-6222

Keywords

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Article
Publication date: 1 November 1972

Allied Colloids have introduced a vinyl‐based resin, Alcolec 532, for the formulation of flexographic printing inks and paper lacquers. It is offered in bead form, which…

Abstract

Allied Colloids have introduced a vinyl‐based resin, Alcolec 532, for the formulation of flexographic printing inks and paper lacquers. It is offered in bead form, which assists in maintaining a high degree of purity during manufacture and facilitates handling.

Details

Pigment & Resin Technology, vol. 1 no. 11
Type: Research Article
ISSN: 0369-9420

Abstract

Details

Pigment & Resin Technology, vol. 36 no. 6
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 1 March 2006

Aleksandra Drizo and Joseph Pegna

To provide a comprehensive state of the art review of environmental impact assessment (EIA) of existing rapid prototyping (RP) and rapid tooling (RT), and identify…

Abstract

Purpose

To provide a comprehensive state of the art review of environmental impact assessment (EIA) of existing rapid prototyping (RP) and rapid tooling (RT), and identify prospective research needs.

Design/methodology/approach

The sparse literature on the EIA of RP and RT is balanced by that of the comparatively mature field of industrial ecology (IE). Hence, the review emphasizes portable IE measurement and evaluations methods. As RP and RT can also be viewed as design tools and mass customization manufacturing, other EIA may be needed.

Findings

The scarcity of research to date combined with rapid technological advances leaves a large number of unresolved issues. In addition, the special character of RP and RT, as design and manufacturing enablers implies that future research is needed.

Research limitations/implications

This review is drawn from a technology in rapid evolution. Hence, unresolved issues focus on technologies that already are on the market and the research needs are formulated in terms of state of the art process research.

Practical implications

As technological advances multiply, so does the number of unresolved environmental problems. The review of unresolved issues points to a pressing need to assess the consequences of RP and RT while identified research needs point the way to anticipated areas where further assessment methods will be needed.

Originality/value

This paper intends to raise awareness about the potential environmental impacts from RP and RT, by presenting the problems associated with current methods for measuring environmental effects and discussing some of the most urgent unresolved issues, specifically with respect to materials. Indirect effects of other uses of RP and RT are discussed only briefly for lack of available data.

Details

Rapid Prototyping Journal, vol. 12 no. 2
Type: Research Article
ISSN: 1355-2546

Keywords

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