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Showing posts with label Technical Textile. Show all posts
Showing posts with label Technical Textile. Show all posts

Wednesday, 17 January 2024

Application of Textile as Hygiene Products

 

Application of Textile as Hygiene Products 

Healthcare/Hygiene Products: These products are related to daily uses in hospitals and health care industries. These include bedding, clothing, surgical gowns, cloths wipes and so on. All fibers are used in this product must be non-toxic, non-allergenic, noncarcinogenic and must be able to be sterilised without imparting any change in their physical or chemical characteristics. The range of this products available is vast but typically they are used in the operating room theatre or on the hospital ward for the hygiene, care and safety of staff and patients. Production of hygiene and medical textiles is on increase, as is the variety of applications in this important sector. By 2005, hygiene and medical textiles valued at US$4.1 billion, almost 12% of the global technical textiles market.
Surgical Gowns:  Surgical gowns used to help prevent the gown wearer from contaminating vulnerable patients, such as those with weakened immune systems.  Gowns are one part of an infection-control strategy. Disposable nonwoven surgical gowns have been adopted to prevent the release of pollutant particles into the air which is a probable source of contamination to the patient. Surgical gowns are composed of nonwoven fabrics and polyethylene films in weight range of 30–45 g/m2.

Surgical Masks:  Surgical mask is intended to be worn by health professionals during surgery and during nursing to catch the bacteria shed in liquid droplets and aerosols from the wearer’s mouth and nose. Simple surgical masks protect wearers from being splashed in the mouth with body fluids, and prevent transmission of body fluids from the wearer to others, e.g. the patient. Surgical masks are popularly worn by the general public in East Asian countries to reduce the chance of spreading airborne diseases.


Surgical Drapes, Cloths:  These are also called scurbs. Scrubs are the sanitary clothing worn by surgeons, nurses, physicians and other workers involved in patient care in hospitals. Originally designed for use by surgeons and other operating room personnel. In many operating rooms, it is forbidden to wear any exposed clothing, such as a t-shirt, beneath scrubs. As scrubs are designed to promote a clean environment, the wearing of outside clothing is thought to introduce unwanted pathogens.
Surgical Cap:  Surgical cap an accompaniment to the surgical gown (below) which covers the head, and sometimes facial hair, of members of the surgical team; the object is to avoid contamination of the wound. The surgical cap is in place to prevent hazardous bodily fluids from splashing onto the doctor or nurse’s hair and head. They are also used to prevent hair from affecting the vision of the medical professionals. On the other hand of the spectrum, loose hair or even other contaminants like hair products or dandruff is dangerous to the patient. 

Diaper:  A diaper or a nappy is a type of underwear that allows the wearer to defecate or urinate without the use of a toilet, by absorbing or containing waste products to prevent soiling of outer clothing or the external environment. Diapers are made of cloth or synthetic disposable materials. Cloth diapers are composed of layers of fabric such as cotton, hemp, bamboo, microfiber, or even plastic fibers such as PLA or PU. Disposable diapers contain absorbent chemicals and are thrown away after use. Cloth diapers are reusable and can be made from natural fibers, synthetic materials, or a combination of both 

Medical textiles are located at the interfaces between technical disciplines and life sciences. Prospects for medical textiles are rather better, especially for nonwoven materials and disposable medical textiles used in surgical rooms. Combination of textile and its application in medical sciences has been proof that the painful days of patients and surgeons converting into the comfortable days.

Tuesday, 16 January 2024

Implantable Medical Textiles:

 

Implantable Medical Textiles


Implantable products are biomaterials which are used for wound closure (e.g. suture), replacement surgery (e.g. vascular graft, artificial ligaments etc.) Another important category of implantable products is soft-tissue implants.

These are flexible strong materials commonly used to replace tendons, ligaments and cartilage in both reconstructive and corrective surgery. Suspensors and reinforcing surgical meshes are used in plastic surgery for repairing defects of the abdominal wall.

Artificial Ligament:

Artificial ligament is used for joining two joints of a human body. It is a one kind of medical device. In adult skeleton there are 400 joints which are joined by the ligaments. The ligament is a short band of tough, flexible, fibrous connective tissue that connects two bones. Artificial Ligament is a multilayered or tubular woven structure having intra-particular region, at least one bend region and end regions.







Example: DACRON, LEEDS-KEIO ARTIFICIAL LIGAMENT

A prosthetic ligament should have following characteristics:

  1. Extensive tough
  2. Stiffness to match the compliance of normal ACL (Anterior Cruciate Ligament)
  3. Durability to withstand against high tensile load for million of cycles without wear
  4. Perfectly tolerable to host


Artificial skin:

The characteristics of human skin are heavily dependent on the hydration of the tissue – in simple terms, the water content. This also changes its interaction with textiles. Artificial skin is a substitute for human skin produced in the laboratory, typically used to treat severe burns. The skin’s basic functions, which include protecting against moisture and infection and regulating body heat.

Skin is primarily made of two layers: the uppermost layer, the epidermis, which serves as a barrier against the environment; and the dermis. The dermis also contains the proteins collagen and elastin, which help give the skin its mechanical structure and flexibility. Artificial skins work because they close wounds, which prevents bacterial infection and water loss and helps the damaged skin to heal. Artificial skins mimic either the epidermis or dermis, or both epidermis and dermis in a “full-thickness” skin replacement.



For example, one commonly used artificial skin, Integra, consists of an “epidermis” made of silicone and prevents bacterial infection and water loss, and a “dermis” based on bovine collagen and glycosaminoglycan.

Some Manufacturer of Artificial Skin:

  1. Human Bio Sciences Incorporated (India)
  2. Delhi Dressing and Surgicals (India)
  3. Intercytex Ltd. (UK) 


Vascular Graft:

Vascular grafts are used for the blood vessels, including the arteries and veins. Synthetic materials have been employed in vascular graft design for a variety of reasons, mainly due to the ease and flexibility of tailoring their mechanical properties. One such example is ePTFE, a porous polymer with an electronegative luminal surface that is not degradable. However, only 45% of standard ePTFE grafts are patent as femoropopliteal bypass grafts at 5 years, while autologous vein grafts display a 60–80% patency.



Textiles produced in the form of a tube have been used as implants to repair the damaged arteries and veins. Typical diameters of such tubes are 6mm, 8mm, and 10mm. Vascular grafts are either made from polyester or PTFE fibre, woven or knitted. The knitted tube has the advantage of good tissue encapsulation, but less satisfactory in preventing blood leakage, because of the loose structure of the knitted materials. On the other hand, the woven tube is good at preventing blood leakage, but is not so good for tissue growth, due to its relatively tight structure.

Saturday, 13 January 2024

Application of Textile as Hygiene Products

 

Application of Textile as Hygiene Products 

Healthcare/Hygiene Products: These products are related to daily uses in hospitals and health care industries. These include bedding, clothing, surgical gowns, cloths wipes and so on. All fibers are used in this product must be non-toxic, non-allergenic, noncarcinogenic and must be able to be sterilised without imparting any change in their physical or chemical characteristics. The range of this products available is vast but typically they are used in the operating room theatre or on the hospital ward for the hygiene, care and safety of staff and patients. Production of hygiene and medical textiles is on increase, as is the variety of applications in this important sector. By 2005, hygiene and medical textiles valued at US$4.1 billion, almost 12% of the global technical textiles market.
Surgical Gowns:  Surgical gowns used to help prevent the gown wearer from contaminating vulnerable patients, such as those with weakened immune systems.  Gowns are one part of an infection-control strategy. Disposable nonwoven surgical gowns have been adopted to prevent the release of pollutant particles into the air which is a probable source of contamination to the patient. Surgical gowns are composed of nonwoven fabrics and polyethylene films in weight range of 30–45 g/m2.

Surgical Masks:  Surgical mask is intended to be worn by health professionals during surgery and during nursing to catch the bacteria shed in liquid droplets and aerosols from the wearer’s mouth and nose. Simple surgical masks protect wearers from being splashed in the mouth with body fluids, and prevent transmission of body fluids from the wearer to others, e.g. the patient. Surgical masks are popularly worn by the general public in East Asian countries to reduce the chance of spreading airborne diseases.


Surgical Drapes, Cloths:  These are also called scurbs. Scrubs are the sanitary clothing worn by surgeons, nurses, physicians and other workers involved in patient care in hospitals. Originally designed for use by surgeons and other operating room personnel. In many operating rooms, it is forbidden to wear any exposed clothing, such as a t-shirt, beneath scrubs. As scrubs are designed to promote a clean environment, the wearing of outside clothing is thought to introduce unwanted pathogens.
Surgical Cap:  Surgical cap an accompaniment to the surgical gown (below) which covers the head, and sometimes facial hair, of members of the surgical team; the object is to avoid contamination of the wound. The surgical cap is in place to prevent hazardous bodily fluids from splashing onto the doctor or nurse’s hair and head. They are also used to prevent hair from affecting the vision of the medical professionals. On the other hand of the spectrum, loose hair or even other contaminants like hair products or dandruff is dangerous to the patient. 

Diaper:  A diaper or a nappy is a type of underwear that allows the wearer to defecate or urinate without the use of a toilet, by absorbing or containing waste products to prevent soiling of outer clothing or the external environment. Diapers are made of cloth or synthetic disposable materials. Cloth diapers are composed of layers of fabric such as cotton, hemp, bamboo, microfiber, or even plastic fibers such as PLA or PU. Disposable diapers contain absorbent chemicals and are thrown away after use. Cloth diapers are reusable and can be made from natural fibers, synthetic materials, or a combination of both 

Medical textiles are located at the interfaces between technical disciplines and life sciences. Prospects for medical textiles are rather better, especially for nonwoven materials and disposable medical textiles used in surgical rooms. Combination of textile and its application in medical sciences has been proof that the painful days of patients and surgeons converting into the comfortable days.

Monday, 8 January 2024

Application and requirements of waterproof breathable fabric

 

Application of water proof breathable fabrics

v  Leisure
Ø  Heavy duty, foul weather clothing: Anoraks, cagoules, packs, over-trouser, hats, gloves.
Ø  Fashionable weather protection: Rainwear, skiwear, golf suites, walking boot lining, panels and sports footwear linings, panels and inserts.
Ø  Tents
Ø  Sleeping bag covers.

v  Work
Ø  Foul weather clothing: Survival suits, special military protective clothing, clean-room garments, surgical garments, hospital drapes, mattress and seat covers, packaging, wound dressing, filtration.
Ø  Domestic and transport: Non-allergic bedding, car covers, fire smoke curtains in ships, cargo wraps in aircraft.


Requirements of water proof breathable fabrics
Ø  Optimum heat and moisture regulation.
Ø  Absorption of surplus heat.
Ø  Water proofness.
Ø  Good air and water vapour permeability.
Ø  Rapid moisture absorption and conveyance capacity.
Ø  Rapid drying to prevents catching cold.
Ø  No/Minimum water absorption of the layer of clothing just positioned to the skin.
Ø  Dimensionally stable ever when comes in contact to water.
Ø  Durable (tear, abrasion résistance).
Ø  Easy care.
Ø  Hydrostatic resistance.
Ø  Lightweight.

Ø  Soft and pleasant touch.

Sunday, 7 January 2024

Methods of production of micro porous coating for water proof breathable fabric

 

Methods of production of micro porous coating
1.       Wet coagulation process.
2.       Thermo coagulation process.
3.       Foam coating.





1. Wet coagulation process:
Wet coagulation process : Polyurethane polymer is dissolved in the organic solvent dimethyl formamide to produce a solution insoluble in water. This is then coated on to the fabric. The coated fabric is pass through a conditioning chamber containing water vapour. As the organic solvent is miscible with water, it is diluted and solid polyurethane precipitates. The fabric is then washed to remove the solvent, which leaves behind pores in the coating. Finally the coated fabric is mangled and dried. This method is not very popular as it requires high capital cost machine and solvent recovery expensive.
Ø  Produces a very fine interconnecting structure of micro pores.
Ø  Pores are small enough to keep droplets of water out but, large enough to let the small water vapour molecule.
Ø  Micro-porosity can also be created by leaching the salts on treatment of the film with water.
Ø  Shows ultrafine pores of <1µm, in addition to a honeycomb skin core structure of 1-20µm pores.
Ø  Micro pores was produced due to the subtle difference in the rates of coagulation as the resin particle interface.
Ø  Precise control over the coating operation is required to generate a consistent, uniform pore structure, preferably below 3µm for optimum balance of breathability and water proofness.

2. Thermo coagulation process:
Thermo coagulation: Polyurethane is dissolved in an organic solvent and the resulting solution mixed with water to produce an emulsion. The emulsion 'paste' is coated on to one side of the fabric. The coated fabric is then goes through a two stage drying process. The first stage employs a low temperature to remove the organic solvent, precipitating the polyurethane. The coating is now mixture of solid polyurethane and water. The second stage employs a higher temperature to evaporate the water leaving behind pores in the coating.
Ø  PU- based coating technique operates on thermo-coagulation technique.
Ø   PU is dissolved in a solvent mixture of methyl ethyl ketone, tolune, and water, having 15-20% solids and coated on the fabric.
Ø  The low boiling solvents evaporates and leads to precipitations of PU in the non solvent.

3. Foam Coating:
A mixture of polyurethane and polyurethane/polyacrylic acid esters are dispersed in water and then foamed. The foam is stabilised with the aid of additives The foam is then coated on to the one side of the fabric. The coated fabric is dried to form a microporous coating. It is important that the foam is open cell to allow penetration of water vapour but with small enough cells to prevent liquid water penetration. The fabric is finally calendered under low pressure to compress the coating. As the foam cells are relatively large, a flurocarbon polymer water- repellent finish is applied to improve the water resistant properties. This type of coating production  is environmentally friendly as no organic solvents are used.
Ø  Water based polyurethane/ polyacrylic acid esters are used.
Ø  The foam is stabilized with the aid of additives.
Ø  Then the foam is coated on one side of the fabric and dried to form a micro porous coating.
Ø  The fabric is finally calendered under low pressure to compress the coating.
Ø  The  foam cells being relatively large, a flurocarbon  polymer based water-repellent finish is applied to improve the water resistant properties.
Ø  The water vapour permeability of foam-coated fabric is higher and their water resistence was found to be lower than those of non foam coated fabrics with the same coating thickness.
Ø  The water vapor permeability and the water resistance become higher when the foaming speed is increased.

Hydrophilic coating:
Ø  Same as hydrophilic membrane.
Ø  Transmit vapour by a molecular mechanism involving adsorption diffusion and desorption.
Ø  Coating are based on polyurethane, which has been modified by incorporating polyvinyl alcohols and polyethylene oxides.
Ø  Chemical affinity for water vapour allowing the diffusion of water vapour through the amorphous regions of the polymer.

Combination of micro porous coating and membrane:
Poly coating and membranes have excellent integrity. This can be conferred in two ways:
1. By a high degree of hydrogen bonding, principally between polar groups in the hydrophilic segments of adjacent polymer chain.
2. By forming covalent cross links between adjacent polymer chain. The effective length and density of the cross links are variables affecting polymer swelling and thus vapour permeability.

Biomimetic material:
Biomimetics is the mimicking of biological mechanism, with modification to produce useful artificial items.
Research workers (UK) modelled an opening pore comprising flaps of two laminated materials with different moisture uptakes life leaf stomata which opens when the plants needs to increase moisture vapour transpiration and closes when it need to reduce it.
Biomimetics has now become a commercial reality.



Stomatex (Biomimetic material):
Ø  Stomatex is claimed to be 'the most comfortable clothing and footwear systems in the worlds today
Ø  Akzo nobel company is marketing stomatex.
Ø  This is closed foam insulating material made from neoprene incorporating a series of convex domes vented by a tiny aperture at the apex.
Ø  Provide a controlled release of water vapour for comfortable wear characteristics.
Ø  Respond to the level of activity by pumping faster as more heat is produced, returning to a more passive state when the wearer is at rest.
Ø  Stomatex is used in conjunction with Sympatex to produce a breathable water proof insulating barrier for use in clothing and footwear.

Saturday, 6 January 2024

Smart breathable fabric

 

Smart breathable fabric:
Ø  It is not possible to achieve all of desirable properties of water proof breathable fabrics in a simple structure of any single fibre or their blend.
Ø  The two layer structure has layer close to skin of the wicking type comprised of synthetic fibers. e.g micro denier polyester and the outer layer usually cotton or rayon that absorbs and evaporates.
Ø  Micro denier polyester is ideal for wicking perspiration away from the skin.
Ø  Dense fabric with superfine or micro fibre yarn gives the best wicking properties.

Polyester
Ø  Advantages:
o   Dimensional Stability.
o   Excellence resistance to dust, dirt, alkalis, decay, mold, organic solvent.
o   Light weight.
o   Durable.
o   Smooth hand feel.
o   Elasticity.
o    Heat resistance.
o   Low Cost.
o   Easy care.
Ø  Disadvantages
o   Low moisture absorption.
Ø  Most polyester used un base layer clothing is chemically treated so that they are able to wick moisture.
Ø  This can be done by
o   Coating the polyester with hydrophilic finish.
o   Changing its surface chemistry to improve its wetting by moisture
Ø  Molecular modification
o   Costly.
o   Permanent(50 wash)

Ø  Toray:
o   Develops airfine fieldsensor.
o   Grooves polyester filament yarn.
o   Grooves help the fabric absorb sweat quickly and disperse it along the surface.
Ø  Polyester coolmax:
o   Increase wearer comfort through rapid removal of perspiration by capillary.
o   Has good wicking properties and non absorbency.
o   Coolmax and thermostat polyester used in two fold garments, coolmax is used to wick moisture away from the skin and polyester is used to maintain warmth.

2. Polypropylene
Ø  Hydrophobic nature.
Ø  Has good thermal characteristics (keeping warm in cold weather and cold in warm weather).
Ø  Cannot wick liquid moisture but moisture vapour can still forced through polypropylene fabric by body heat.
Ø  More oleophilic than polyester.
Ø  Has a great tendency to attract and hold oily body odours.

3. Nylon
Ø  Advantages
o   Lightweight.
o   High strength.
o   Durable.
o   Soft hand feel.
o   Higher moisture absorption than the polyester and has better wicking behaviour.
Ø  Disadvantages
o   Expensive.
o   It dries more slowly than polyester due to its higher moisture absorption.
Ø  Nylon is good fabric choice when combined with PU coating.
Ø  Used in tightly woven outwear, which can trap heat because of low air permeability.
Ø  Used in breathable knitted g=fabrics and premimum application.

Ø  Polus - Ex:
o   Developed by DuPont
o   Permeable to moisture.
o   Made by laminating a multi porous film to a nylon fabric and moisture permeability of 8000g/m2 /24 hours, as well as 20 m head of water.




3. Silk
Ø  Advantages:
o   Breaths well for its hollow structure.
o   Soft
o   Strong
o   Has natural wicking properties
Ø  Disadvantages:
o   Dries Slowly.
o   Requires care cleaning.
4. Viscose
Ø  Not preferred next to skin as it holds water in sportswear.
Ø  Wicking behaviour improves by incorporation of some hydrophobic finishes

5. Wool
Ø  Not appropriate for a base layer for its 'itch'.
Ø  Fibre should be very fine thus make a higher density, strength, abrasion resistence, increase warmth.
Ø  Fine fiber absorb less water weight per cross sectional area, so they are more resilient than coarser fibers.
Ø  Natural wicking properties.
Ø  Fine cholorinated merino wool is employed is sportwool as a base layer.

Ø  Disadvantages:
o   Slow to dry.

Ø  A wool fabric has absorb significantly more sweat than a polyester fabric.
Ø  The skin temperature decreased faster and recovered more slowly after contact with the wool fabric compared polyester fabric.

5. Special Fibers:

5.1. Hygra
Ø  Launched by unitika limited.
Ø  Sheath core type filament yarn made from water absorbing polymer and nylon
Ø  The water absorbing polymer has a special network structure that absorbs 35 times its own weight of water.
Ø  Offer quick releasing properties.
Ø  Nylon gives tensile strength and dimensional stability.
Ø  It has superior anistatic properties even under low wet condition.
Ø  Use in athletic wear, skiwear, golf wear etc.

5.2 Lumiace
Ø  Product from Unitika.
Ø  A collection of polyester filaments having different fineness (0.5-2.0 denier per filament) and irregular cross section.
Ø  Hygra-Lumiace combination in knitted fabric is very popular in top Japanese athletes.

5.3 Dryarn
Ø  Fiber from aquafil.
Ø  Completely recyclable polyproplyene microfibers.
Ø  Lightweight, comfortable, use in different sports.
Ø  Soft handle.
Ø  High thermoregulatory.
Ø  Dries quickly.
Ø  Avoids unpleasant odour associated with bacteria.

5.4 Killat N
Ø  Nylon hollow filament from Kenebo Ltb.
Ø  Hollow portion is about 33% of the cross section of filament.
Ø  Gives good water absorbency and warmth retentive property.
Ø  The yarn is spun as bio component filament yarn with soluble polyester copolymer as the core portion and nylon as the skin portion.
Ø  Soluble polyester copolymer is dissolved by alkali treatment and a hollow portion is crated.

5.5 Triactor
Ø  Developed by Toyoba Co. Ltd.
Ø  Quick sweat absorbency by capillary action due to Y shaped cross section.
Ø  First drying.

5.6 Field Sensor (Smart Breathable Fabric)
Ø  Very popular high performance fabric from Toray.
Ø  Multi layer structure.
Ø  Absorb perspiration quickly and transport it up to the outer layer of fabric very rapidly by capillary action.
Ø  Composed of coarser denier yarn on the inside surface and fine denier hydrophobic polyester yarn in a mesh construction on the outer surface to accelerate quick evaporation of sweat.




5.7 Naiva (Smart Breathable Fabric)
Ø  Developed by Unitika.
Ø  Combining the Naiva yarn with a nylon microfibre.
Ø  Naiva is an Eval/Nylon bi-component filament yarn.
Ø  Eval is a copolymer resin of ethylenevinylalchol.
Ø  Composition 55% Eval and 45% nylon. 
Ø  Many micro loops on the surface, which are formed by making use of high thermal shrinkage property of Naiva yarn,
Ø  Good moisture permeability.
Ø  Lightweight.
Ø  Soft.
Ø  Use in active sportswear.

5.8 Entrant Dermizax EV (Smart Breathable Fabric)
Ø  Lightweight fabric.
Ø  Have feather smooth texture.
Ø  Excellent water proof.
Ø  Excellent moisture permeability.

5.9 Entrant HB (Smart Breathable Fabric)
Ø  New generation fabric.
Ø  Hybrid structure that synergistically integrates the advantages offered by a coating and lamination.
Ø  HIgh resistance to water pressure.
Ø  High durability.
Ø  Used in outdoor wear.

5.10  H2OFF (Smart Breathable Fabric)
Ø  Made up of polyester microfibre fabric.
Ø  High density weave structure comprising millions of microcrimped fiber loops.
Ø  Superb and durable water repellency.
Ø  Superior breathability.
Ø  Wind chill resistance.
Ø  Attractive with soft handfeel.

Assessment technique
Assessment of the effectiveness of water proof breathable fabric requires measurement of three properties
1.       Resistance to penetration and absorption of liquid water.
2.       Wind resistance.
3.       Water vapour permeability.

Comparision of Budesmann simulated shower and actual rain
Type of Drop
Diameter(mm)
Terminal Velocity (cms-1)
Kinetic Energy (J X 10-6)
Cloud Burst
0.30
700
346
Excessive rain
0.21
600
87
Heavy rain
0.15
500
22
Moderate rain
0.10
400
4.2
Light Rain
0.045
20
0.095
Drizzle
0.02
75
0.0012
Bundesmann
0.64
540
2000

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