Section+4.1



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= //What are these other methods you ask? Lets take a look..........// =

‍1. Bonding

 * == ‍Thermal - heat,hot air, infrared, ultra sound ==
 * == ‍Hydro Entanglement/Spun lacing ==
 * == ‍Chemical Bonding ==

Dry Laid:

 * == This is a web formation of fibers. ==
 * == Dry Laid is the most common. ==
 * == These fibers are short,staple fibers. ==
 * == Air Laid is a dry method. Staple fibers are dispersed through the air on to a screen. ==
 * == Carding is also another dry laid method. This method is done on a machine. ==
 * == Needlepunching is a dry laid method. ==

Termonology:
=2. Carding: fibers are made into slivers prior to spinning =
 * 1) == Needlepunching: mechanically bonding/interlocking fibers by spunbond or carding. ==



What products can we find this method in?

 * == wipes, air filters ==

Properties of Dry Laid:

 * == absorbancy ==
 * == abraision resistant ==
 * == softeness ==
 * == tear resistant ==

Wet Laid:

 * == In this method fibers are suspended in the water then put on to a screen. ==
 * == Staple fibers ==
 * == Held together by bonding or spun-laced. ==

What do we use wet laid method for?

 * == Adhesive carries ==
 * Battery separators
 * Filters
 * Insulation
 * Interlining
 * Laminating and coating bases
 * Roofing substrates
 * Wipes
 * Tea Bag paper
 * Towels
 * Table Cloth
 * Surgical clohing
 * Bed linen

3. Spunbond aka Polymer Laid

 * == These fibers are thermoplastic ==
 * == They can be wetblown ore spunbonded ==
 * == Second most common ==
 * == popular with olefin and polyester ==

What are the properties?

 * == strong ==
 * == high tensile and tear strength ==
 * == low bulk ==
 * == filament fibers ==

What products are made using this method?

 * == geotextiles ==
 * == wall coverings ==
 * == filters ==
 * == shoe lining ==
 * == insulation ==
 * == carpet backing ==
 * == tags ==
 * == labels ==
 * == tents ==

How does it work????
== Synthetic fibers are broke into staple ( short ) fibers and cool air then bonds are entangles the fibers. ==

What are the properties?

 * == low strength ==
 * == low abraision resistance ==

What products are made using this method?

 * == hospital ==
 * == medical supplies ==
 * == insulation ==
 * == filters ==

Reference List : Google Images Class Notes