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Unformatted text preview: Chapter 2, Part III Nonwoven Fabrics TXMI 2100 Outline
What is Nonwovens Formation of Webs Using Staple Fibers
Carding (dry laying) Wet laying Formation of Webs Using Polymers
Spun-Bonding Melt-Blown The Bonding of Webs
Mechanical bonding Thermal bonding Chemical bonding The Uses of Nonwovens Web Formation I: Carding Method (DryLaying) Fibers opened Fibers carded Fibers laid to form a web Carding Method (DryLaying) Web Formation II: AirLaying Web Formation III: WetLaying
Fibers suspended in water Fibers collected on a screen to form a web Water drained and the web dried WetLaying Nonwoven Webs Formed Using Polymers Spun-bonding Process
Fibers can be stretched Continuous filament fibers Melt-Blown Process
Short fibers Spunbonding Process Webs Formed Using Spunbonding Process Continuous filament fibers Strongest tensile strength Strongest tearing strength Uses of Nonwovens Made Using Spun bonding Method Apparel Interlining Carpet backing Furniture/bedding materials Bagging/packing materials Geotextiles (polyolefins) Wall covering, maps, tags... MeltBlown Process Web Bonding Methods
Needle punching Stitch-bonding Spunlacing Thermal bonding Chemical bonding
Adhesive Solvent (1) Needle Punching (1) Needle Punching
Needles with hooks carry one or more fiber and push them through the web Repeated needle punching causes interlocking of fibers Needle punching increases dimensional stability and strength of web as well as web density Heated needle are used for synthetic fibers A relatively inexpensive process (2) StitchBonding: A Series of Interlooped Stitches Running along the Fabric Length (3) Spunlacing: Fiber Entanglement Caused by High Pressure Water Jets Spunlacing Soft hand Good drape properties Limited strength and dimensiional stability Uses: draperies, curtains, bedspread, table cloths, interlining... Thermal Bonding Using HeatSensitive Binder Fibers Thermal Bonding Using Hot Calendars Chemical Bonding (Latex Adhesive) Chemical Bonding High strength High stiffness Low flexibility Higher cost Uses of Nonwovens
Automotive Civil engineering/construction Filtering equipment Clothing Home furnishing Military Healthcare Personal care Polyolefin Geotextile Nonwovens Used in Road Construction Uses of Nonwovens ...
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- Spring '11