Nonwoven - what are Nonwoven

Thermal bonding: This method uses the thermoplastic properties of certain synthetic fibres to form bonds under controlled heating..  Nonwovens can be made conductive, flame retardant, w

Nonwoven

Our Presenter…

Southeast University Department Of Textile Engineering

I/A 251,252 Tejgaon Dhaka Banglade sh

prepared by : Mazadul Hasan sheshir

Presentation Content…

What Are Nonwoven…???

“Nonwovens are unique,high-tech,engineeringed fabrics

made from fibers ”

Definition Of Nonwoven : “A nonwoven is a sheet of fibers, continuous filaments, or chopped yarns of any nature or origin, that have been formed into a web by any means, and bonded together by any means, with the exception of weaving or knitting”

How They’re Made

described as taking place in three stages, although modern technology allows an

overlapping of some stages, and in some cases all three stages can take place at the same The three stages are:

 Web formation

 Web bonding

 Finishing Treatments

Steps Of web Formation:

At Four Step They are made That’s Have been given below:

Drylaid

There are two methods of drylaying:

(1) Carding,

(2) Airlayding.

Spunmelt

manufacturing of nonwoven webs directly from

thermoplastic polymers It encompasses 2 processes and the combination of both.

Spunlaid :

In this process polymer granules are melted and molten polymer is extruded through spinnerets The continuous filaments are cooled and deposited on to a conveyor to form a uniform web

The principle of wetlayding is similar to paper manufacturing The difference lies

in the amount of synthetic fibres present in a wetlaid nonwoven A dilute slurry of water and fibres is deposited on a moving wire screen and drained to form a

web The web is further dewatered, consolidated, by pressing between rollers, and dried.

Web Bonding: There are three basic types of bonding:

1 Chemical,

2 Thermal, &

3 Mechanical.

to the application of a liquid based bonding agent to the web Three groups of materials are commonly used as binders-acrylate polymers and copolymers, styrene-butadiene copolymers and vinyl acetate

ethylene copolymers Water based binder systems are the most

widely used It can be applied uniformly by impregnating, coating or spraying or intermittently, as in print bonding

Thermal bonding: This method uses the thermoplastic properties of certain synthetic fibres to form bonds under controlled heating

There are several thermal bonding systems

Mechanical bonding: In mechanical bonding the strengthening of the web is achieved by inter-fibre friction as a result of the physical entanglement of the fibres.  There are two major types of mechanical bonding:

1 Needlepunching, &

2 Hydro-entanglement.

Needlepunching can be used on most fibre types Specially designed needles are pushed and pulled through the web to entangle the fibres Webs of different characteristics can be needled together to produce a gradation of properties difficult to achieve by other means

FINISHING TREATMENT

 There is an opportunity to meet the needs of the customer even more precisely by modifying or adding to existing properties

 Nonwovens can be made conductive, flame retardant, water

repellent, porous, antistatic, breathable, absorbent and so on

Converting

 The nonwoven fabric is now complete and in a roll Converters can take it a stage nearer its final form by slitting, cutting, folding,

sewing or heat sealing

 In this way, the quality, properties and size of the converted

nonwoven products can be further tailored to the precise needs of the customer, and the tasks to be performed in an impressively broad range of end-uses

Application Of Nonwoven …

Absorbent hygiene products: Modern disposable absorbent hygiene products have made an important contribution to the quality of life and skin health of millions of people Such as: baby diapers, feminine hygiene products and adult

incontinence products etc benefit from the softness,

smoothness, leakage prevention, strength and protection provided by nonwoven fabrics.

AGRICULTURE& HORTICULTURE

 Nonwovens are used

effectively for optimizing the

productivity of crops, gardens

and greenhouses

 In horticultural applications,

nonwovens protect the plants

against temperature extremes

by day and by night, thus

creating the foundation for

earlier harvests with excellent

results

 One of the fastest growing segments

in the nonwovens industry, filtration is characterized by dozens of end use areas and applications

 Nonwovens can be engineered very precisely to meet exacting

specifications and stringent regulatory requirements for the filtration of air, liquid, bacteria, dust, gas and a

myriad of other areas.

 Some examples of where nonwovens are

used:

 Air filtration

 Liquid filtration

 Automotive filtration

MEDICAL: Nonwovens are extensively used in the medical field and in protection against biological agents in other sectors For example, they can be designed to deliver critical safety properties, such as protection against infections and diseases

 Some examples of where

nonwovens are used:

 Surgical: disposable caps,

gowns, masks, scrub suits

and shoe covers

 Bed linen

 Lab coats

 Fixation tapes

 Drug delivery

 Incubator mattress etc.

 The advantages of using nonwovens

 strong yet light in weight

 optimal fluid absorbency

 exchange of air, body heat and moisture

 Breathability

 Abrasion resistance and lint free.

Some examples of where nonwovens are used

 Food contact packaging

 Food wrap: meat, cheese and fish

 Tea & coffee bags

 Sheets, bags, sacks, wraps for delicate

products (e.g electronic products, car

bumpers, leather goods)

 Bulk products

The advantages of using nonwovens

 Easy to recycle and compost,

 Easy to convert into pads and shapes,

 High tear resistance.

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