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Application of Contemporary Fibers in Apparels Melamine Fibre

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APPAREL VIEWS / NOVEMBER 2011 30 A s per federal trade commission Melamine fibre is defined as, a manufactured fibre in which the fibre-forming substance is a synthetic polymer composed of at least 50 per cent by weight of a cross-linked Melamine polymer and it is mainly produced by Basofil fibres LLC, Enka, NC and marketed under the trade name, Basofil fibre. Basofil is an advanced technology Melamine fibre designed to enhance commodity fibres and synergistic high-temperature fibres to deliver cost-effective, engineered heat insulating and flame-resistant solutions and that the fibre, which is white and dyeable, can be processed on standard textile manufacturing equipment for the production of woven, knitted, and nonwoven fabrics. Production of Melamine fibre The production process Melamine fibre is proprietary. It is based on a unique Melamine chemistry that results in a cross-linked, non-thermoplastic polymer of Melamine units joined by methylene and dimethylene ether linkages. In the polymerization reaction, methylol derivatives of Melamine react with each other to form a three-dimensional structure. This network structure of Melamine fibre produces unique fibres with excellent inherent characteristics for fire protection, heat stability and low flammability – that is also durable and resistant to chemicals and ultraviolet light. Further, Melamine’s most outstanding physical properties are its high Limiting Oxygen Index (LOI), low thermal conductivity and the fact that it does not shrink, melt or drip when exposed to a flame. Fibre properties Melamine fibre is a cost effective heat resistant fibre with a 400°F (200°C) continuous operating temperature. Melamine fibres are flame resistant, have outstanding heat/dimensional stability, and are self-extinguishing. Below are some important characteristics of Melamine fibre: Inherent, non-toxic protection - Fabrics made with Melamine are proven to be non-toxic and non-irritating through vigorous and extensive evaluation of VOC off-gassing, smoke density and skin irritation • Highly insulating - Melamine is the most thermally insulating fibre available, boasting the industry’s highest Thermal Protective Performance (TPP) ratings • Attractive finish - Melamine is white in colour and dyeable to support many different fabric finishes • Durable and protective - With a superior dimensional stability, Melamine will not shrink, melt or drip, making it an excellent choice for protection in electric arc, flash fire, molten metals and hot gas environments • Cool and breathable - Elliptically-shaped Melamine fibres allow fabrics to breathe better and keep wearers cooler • Melamine retains its protective qualities and durability through repeated launderings • Chars without shrinking • Low thermal conductivity • High heat dimensional stability • Processable on standard textile equipment • Unparalleled ultraviolet (UV) resistance • Melamine is insoluble • Improve durability through fibre blending • Optimised design includes: Minimising apparel weight and thickness Maximising durability and minimising lifecycle costs through fibre blending Blending with other fibre Melamine fibres can be blended with both synergistic high temperature fibres and commodity fibres for peak performance. • Melamine/cellulose • Melamine/polyester • Melamine/aramid • Melamine/meta-aramid Because of its variable denier and staple length, low tensile strength, and difficulty in processing, Melamine is generally blended with stronger fibres such as aramids. It is more often used in needled products or yarns made from wrapped spinning techniques, though recent advances have led to satisfactory ring spun yarns, blended with other fibres, such as para-aramids, suitable for weaving into firemen’s turnout gear. This development may lead the way to its adoption in other areas. Faster, stronger, lighter, safer... these demands are constantly being pushed upon by today's researchers and manufacturers, including protective clothing - routine or specialised. High performance and high temperature resistant fibres aid enormously in allowing products to meet these challenges. The markets and products, which are facilitated by the use of these fibres, go far beyond the scope and awareness of most people. Melamine fibre has recently entered the high temperature fibre market, one of the newest fibres, and has made a rapid impact. Melamine fibre is an advanced synthetic fibre having superior heat and flame resistance with decomposition temperature above 350°C Self-extinguishing behaviour of model paper with 35 per cent WF series Melamine fibre.
Transcript
Page 1: Application of Contemporary Fibers in Apparels Melamine Fibre

APPAREL VIEWS / NOVEMBER 201130

As per federal trade commission Melamine fibre is defined as, a manufactured

fibre in which the fibre-forming substance is a synthetic polymer composed

of at least 50 per cent by weight of a cross-linked Melamine polymer and it is mainly

produced by Basofil fibres LLC, Enka, NC and marketed under the trade name, Basofil

fibre. Basofil is an advanced technology Melamine fibre designed to enhance

commodity fibres and synergistic high-temperature fibres to deliver cost-effective,

engineered heat insulating and flame-resistant solutions and that the fibre, which is

white and dyeable, can be processed on standard textile manufacturing equipment

for the production of woven, knitted, and nonwoven fabrics.

Production of Melamine fibre

The production process Melamine fibre is proprietary. It is based on a unique

Melamine chemistry that results in a cross-linked, non-thermoplastic polymer of

Melamine units joined by methylene and dimethylene ether linkages. In the

polymerization reaction, methylol derivatives of Melamine react with each other

to form a three-dimensional structure. This network structure of Melamine fibre

produces unique fibres with excellent inherent characteristics for fire protection,

heat stability and low flammability – that is also durable and resistant to chemicals

and ultraviolet light. Further, Melamine’s most outstanding physical properties

are its high Limiting Oxygen Index (LOI), low thermal conductivity and the fact that

it does not shrink, melt or drip when exposed to a flame.

Fibre properties

Melamine fibre is a cost effective heat resistant fibre with a 400°F (200°C)

continuous operating temperature. Melamine fibres are flame resistant, have

outstanding heat/dimensional stability, and are self-extinguishing.

Below are some important characteristics of Melamine fibre:

• Inherent, non-toxic protection - Fabrics made with Melamine are proven to be

non-toxic and non-irritating through vigorous and extensive evaluation of VOC

off-gassing, smoke density and skin irritation

• Highly insulating - Melamine is the most thermally insulating fibre available,

boasting the industry’s highest Thermal Protective Performance (TPP) ratings

• Attractive finish - Melamine is white in colour and dyeable to support many

different fabric finishes

• Durable and protective - With a superior dimensional stability, Melamine will

not shrink, melt or drip, making it an excellent choice for protection in electric

arc, flash fire, molten metals and hot gas environments

• Cool and breathable - Elliptically-shaped Melamine fibres allow fabrics to

breathe better and keep wearers cooler

• Melamine retains its protective qualities and durability through repeated

launderings • Chars without shrinking • Low thermal conductivity

• High heat dimensional stability • Processable on standard textile equipment

• Unparalleled ultraviolet (UV) resistance • Melamine is insoluble

• Improve durability through fibre blending

• Optimised design includes:

• Minimising apparel weight and thickness

• Maximising durability and minimising lifecycle costs through fibre blending

Blending with other fibre

Melamine fibres can be blended with both synergistic high temperature fibres and

commodity fibres for peak performance.

• Melamine/cellulose • Melamine/polyester

• Melamine/aramid • Melamine/meta-aramid

Because of its variable denier and staple length, low tensile strength, and

difficulty in processing, Melamine is generally blended with stronger fibres

such as aramids. It is more often used in needled products or yarns made from

wrapped spinning techniques, though recent advances have led to satisfactory

ring spun yarns, blended with other fibres, such as para-aramids, suitable for

weaving into firemen’s turnout gear. This development may lead the way to its

adoption in other areas.

Faster, stronger, lighter, safer... these demands are constantly being pushed upon by today's researchers and manufacturers,

including protective clothing - routine or specialised. High performance and high temperature resistant fibres aid enormously

in allowing products to meet these challenges. The markets and products, which are facilitated by the use of these fibres, go

far beyond the scope and awareness of most people. Melamine fibre has recently entered the high temperature fibre

market, one of the newest fibres, and has made a rapid impact. Melamine fibre is an advanced synthetic fibre having

superior heat and flame resistance with decomposition temperature above 350°C

Self-extinguishing behaviour of model paper with 35 per cent WF series Melamine fibre.

Page 2: Application of Contemporary Fibers in Apparels Melamine Fibre

APPAREL VIEWS / NOVEMBER 2011 31

Uses and applications

Apparel made with Melamine provides superior comfort, softness and

breathability while protecting people who work in hazardous environments.

Melamine is suitable for competitive and compliant protective apparel solutions

those are well-suited to industrial, military and fire service professions. In the

event of a fire, protective apparel must resist flame exposure and protect the

wearer. Fabrics made with Melamine retain flexibility and dimensional stability

when exposed to direct flame, ensuring that protective garments will not break

open or shrink away during fire exposure.

Fabrics made with Melamine add insulation and protection in technical apparel.

Following are the major application of Melamine fibre in apparel:

• Fire fighter turnout gear, including gloves and hoods

• Military and law-enforcement protective gear

• Industrial garments and protective workwear

• Racing apparel

Apart from apparel, Melamine is also used for below application in industry:

• Mattresses, home furnishings/nonwovens

• Speciality flame resistant papers

• Electrical papers

• Transmission/friction papers

Measurement Units Typical values

Colour Ivory white

Average diametre µm 15

Average denier g/9000m 2.2 - 2.4

Specific gravity g/cm3 1.4

Tensile strength ksi 36

Tenacity g/den 2.0

Modulus Msi

g/den 1.0 55

Elongation at break Per cent 11

Moisture regain Per cent 5(23°C, 65 per cent RH)

Shrinkage at 200°C Per cent <1(1 hr exposure)

Limiting oxygen index Per cent 32

Maximum continuous °C 200operating temperature

Maximum use temperature °C 260-370°C (500-698°F)

Melting temperature °C Does not melt or drip

Hot air shrinkage, 1 hr. @ 200°C Per cent <1

Resistance to mildew, aging, sunlight Excellent

Resistance to solvents, alkalis Excellent

UV resistance No strength lossafter 200 hrs. xenon

Important properties of Melamine fibre

Melamine – Fibre cross section, longitudinal view, fabric and yarn

Protective converalls made with a Basofil/aramid firber blend hold up to flash-fire conditions

Beginning of test Mid-test End of test

Heat Dimensional Stability

(A) Basofil (B) Para-aramid (C) Meta-aramid (D) Rayon (E) Polyester (F) Modacrylic

By Vasant R Kothari, Assistant Professor, NIFT, Bangalore

(Author can be contacted @ www.vasantkothari.com)

• Filtration media

• Engineered materials/Short-fibre composites

• Adhesives/Fillers

• Tire sealants

• Truck/Rail brakes

• Fire blocking fabrics: Aircraft seating, fire blockers

for upholstered furniture in high-risk occupancies

• Filter media: High capacity, high efficiency, high

temperature bag house air filters.

Conclusion

High performance fibres and high temperature resistant fibres offer numerous

advantages over traditional fibres. Higher strength, lighter weight, higher operating

temperatures and flame-retardant ability are some of the most prominent features

of these fibres. These outstanding properties create opportunities to manufacture

products that historically could not be made due to technical constraints. The

protective clothing area is one of those markets.

High performance fibres allow companies to enter niche markets, which typically

provide higher profits as well as strong barriers to entry for the competition. Even

in the high performance area, many markets have become "commodity"

applications, particularly them Melamine in protective clothing, specifically fire

resistance. The protective clothing market will continue to bring new opportunities

for high performance fibres as the fibre manufacturers expand their current product

lines as well as create new and exciting specialised materials.

Having only recently been introduced, Melamine has a limited range, but rapidly

growing, of on-going applications. Potential looks promising for this high

performance, low cost fibre to find its way into a number of existing areas, especially

as processing difficulties are overcome

Page 3: Application of Contemporary Fibers in Apparels Melamine Fibre

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