Subhash Anand

Partially and fully biodegradable natural fibre – reinforced composites have been prepared using a novel patented woven-nonwoven technology. Natural fibres included jute and sisal, whereas the matrices were of synthetic polymers derived from petroleum (polypropylene (PP)) or natural (polylactic acid (PLA)) resources. The physical, mechanical and flammability properties of these partially and fully biodegradable composites have been studied and compared with those of similarly produced glass-fibre reinforced PP and PLA composites with a view to enabling their use in automotive applications. Mechanical test results showed that the tensile and flexural moduli of the PLA composites were higher than respective PP composites. In comparison, sisal composites have higher tensile and flexural moduli than jute composites. The fire performance of the composites studied by cone calorimetry showed that while natural fibre reinforcement had no effect on time-toignition, peak heat release was significantly reduced. PLA composites had lower burning propensity compared to respective PP composites.

The increasing need of on-demand power for enabling portable low-power devices and sensors has necessitated work in novel energy harvesting materials and devices. In a recent work, we demonstrated the production and suitability of three-dimensional (3-D) spacer all fibre piezoelectric textiles for converting mechanical energy into electrical energy for wearable and technical applications. The current work investigates the textile performance properties of these 3-D piezoelectric fabrics including porosity, air permeability, water vapour transmission and bursting strength. Furthermore, as these textiles are intended for wearable applications, we have assessed their wear abrasion and consequently provide surface resistance measurements which can affect the lifetime and efficiency of charge collection in the piezoelectric textile structures. The results show that the novel smart fabric with a measured porosity of 68% had good air (1855 l/m2/s) and water vapour permeability (1.34 g/m2/day) values, good wear abrasion resistance over 60,000 rotations applied by a load of 12 kPa and bursting strength higher than 2400 kPa. Moreover, the antibacterial activity of 3-D piezoelectric fabrics revealed that owing to the use of Ag/PA66 yarns, the textiles exhibit excellent antibacterial activity against not only Gram-negative bacteria E. coli but they are also capable of killing antibiotic methicillin-resistant bacteria S. aureus.

Polyurethane (PU) foam is one of the most common materials used in the development of pressure relieving cushions. However, it suffers from reduced efficiency in terms of thermophysiological comfort, cost, recycling and importantly, creating a suitable environment for the prevention of pressure ulcers. The paper presents research carried out at the University of Bolton, in the development of pressure relieving cushion applications using three-dimensional (3D) warp knitted spacer fabrics. Three properties, pressure distribution, air permeability, and heat resistance of 3D warp knitted spacer fabrics are focused on, with particular emphasis on pressure distribution in the development of improved performance and efficacy of cushion applications. This research includes the development of a novel technique for measuring pressure distribution while under simulated loading conditions.
Using this system, fully patented novel and smart 3D knitted spacer Airospring® cushions were developed, with the following features:
1. The introduction of a shaped/contoured surface interface was able to re-distribute high pressure points normally located in vulnerable areas of an immobile and seated person.
2. They are much better at reducing peak pressures than PU foam cushions and distribute pressure evenly over a much larger area of the cushion.
3. They provide a well-ventilated and comfortable cushion.
4. They can be laundered in a washing machine, are non-flammable and can be easily recycled.

Polyurethane (PU) foam is one of the most common materials used in the development of pressure relieving cushions. However, it suffers from reduced efficiency in terms of thermophysiological comfort, cost, recycling and importantly, creating a suitable environment for the prevention of pressure ulcers. The paper presents research carried out at the University of Bolton, in the development of pressure relieving cushion applications using three-dimensional (3D) warp-knitted spacer fabrics. This research includes the development of a novel technique for measuring pressure distribution while under simulated loading conditions. Using this system, novel and smart 3D knitted spacer cushions were developed, with the following features: (1) a shaped/contoured surface was able to redistribute high pressure points normally located in vulnerable areas of an immobile and seated person. (2) Peak pressures were reduced and distributed evenly over a much larger area of the cushion than PU foam. (3) They are well-ventilated, comfortable, washable and non-flammable and can be easily recycled.

Polyurethane (PU) foam is one of the most common materials used in the development of pressure relieving cushions. However, it suffers from reduced efficiency in terms of thermophysiological comfort, cost, recycling and importantly, creating a suitable environment for the prevention of pressure ulcers. The paper presents research carried out at the University of Bolton, in the development of pressure relieving cushion applications using three-dimensional (3D) warp knitted spacer fabrics. Three properties, pressure distribution, air permeability, and heat resistance of 3D warp knitted spacer fabrics are focused on, with particular emphasis on pressure distribution in the development of improved performance and efficacy of cushion applications. This research includes the development of a novel technique for measuring pressure distribution while under simulated loading conditions.
Using this system, fully patented novel and smart 3D knitted spacer Airospring® cushions were developed, with the following features:
1. The introduction of a shaped/contoured surface interface was able to re-distribute high pressure points normally located in vulnerable areas of an immobile and seated person.
2. They are much better at reducing peak pressures than PU foam cushions and distribute pressure evenly over a much larger area of the cushion.
3. They provide a well-ventilated and comfortable cushion.
4. They can be laundered in a washing machine, are non-flammable and can be easily recycled.

This paper discusses that three-dimensional (3D) warp knitted spacer structures offer significant attributes that create sustainable production advantages in dry exhaust systems for the automotive paint industry. The advantages that are offered include improved airflow and the potential to combine to a composite solution with a high paint holding capacity; this concept of filtration also offers the possibility of a durable filter capable of industrial cleaning and reuse numerous times. The paper describes the innovation of these 3D warp knitted spacer filters from theoretical and traditional filtration aspects, followed by an empirical characterization that justifies commercial trials within the industry.

The paper focuses on the development of novel absorbent nonwoven structures by using natural biodegradable carboxymethylcellulose (CMC), alginate and polylactic acid (PLA) fibres. These fibres have been blended and reinforced with synthetic hollow polyester (HPES), polypropylene (PP) and hollow viscose (HV) fibres. The main aim was to enhance the wicking properties of the structures for minimising the pooling of exudate and maceration. It is also aimed to enhance the integrity of structures to minimise the contamination of wounds due to loose fibres. The incorporation of PLA into wound dressings has been attempted for the first time and their functional properties have been studied. The single-fibre, blended and hybrid fabrics have been engineered. The results demonstrate that HPES reinforcement has a critical importance for CMC fabric in terms of wicking properties, tensile properties and air permeability. It has also been demonstrated that the contribution of PLA in the wound dressings is to enhance the properties such as absorbency, wicking, flexural rigidity and air permeability.

The chapter discusses the need for understanding the application of textile materials and textile-based medical devices to enhance the healthcare and wellbeing of people. The aim of this chapter is to highlight the specific medical and surgical applications for which the textile materials are currently being used. A variety of products and their properties that make them suitable for these applications are discussed. Specialty polymers and fibres and their use in designing and developing medical devices for wound management, infection control management and life-saving risk management are highlighted. The physiology of wound, classification of wounds and appropriate dressing selection for a successful wound management are outlined. High-tech wound dressings and the current state of the art of novel dressings such as odour adsorbent and antimicrobial dressings are critically reviewed. The role of compression therapy in the treatment and prevention of venous leg ulceration is discussed. The merits and limitations of the current compression therapy regime and the research into the development of novel compression bandages are highlighted.

Infection, cross-infection, and infectious diseases are critical for health care personnel and patients in hospitals mainly owing to multi-drug-resistance pathogens. Textile materials and garments used in hospitals promote cross-infection as they are used as a vehicle by the pathogenic disease-causing bacteria to spread the infection. However, smart textile materials play a vital role in protecting against the transmission of diseases not only in hospitals but also in other environments where people gather in large numbers. This chapter discusses the application of such materials for infection control management including wound infection management in hospitals. The role of hospital protective garments is summarised. Test methods and standards that cover surgical gowns, drapes, and clean air suits are highlighted