Hydroentanglement

C. R. Woodings, "The Hydroentanglement of a Range of Staple Fibres," Proceedings of the IMPACT89 Nomvovens Conference, Miller Freeman Pubhcations, Amelia Island, Fla., 1989. 

Within the plane of a nonwoven material, the fibers may be either completely isotropic or ia a preferred orientation or alignment, usually with respect to a machine or processiag direction. In the case of thicker, dry-laid nonwovens, fiber orientation may be developed ia the third dimension, ie, that dimension which is perpendicular to the plane of the fabric, by a process known as needle-punching (7). This process serves to biad the fibers ia the nonwoven by mechanical interlocking. Hydroentangling is an alternative to needle-punching (8). 

Hydroelectric turbines, virtual two-way SMA devices in, 22 349-350 Hydroentanglement, 17 507-508 Hydrofinishing, 15 216 Hydroflumethiazide, molecular formula and structure, 5 162t Hydrofluoric acid (HF), 4 579t. See also Hydrogen fluoride North American capacity of, 14 15t production of, 14 15 silicon solubility in, 22 491-492 in sodium fluoride manufacture, 22 825 solubility of boron halides in, 4 140t solubility of metal fluoroborates in, 4 152t... 

Nonwovens, due to their high surface area, cellulose content, and some of the manufacturing processes (such as hydroentangling), can carry a bio-burden that could tax the preservative in the cleaning solution of the ensuing wipe product. If the product needs to be preserved, attention should be paid to the nonwoven substrate as well as the solution. 

Nonwoven geotextiles. Nonwoven fabrics are defined as a sheet, web, or batt of directionally or randomly oriented fibres/filaments, bonded either by friction, and/or cohesion, and/or adhesion. In general, nonwoven fabric formation can be considered as a two-step process web formation (aligning the fibres with certain orientation characteristics) and bonding these fibres by mechanical, thermal, or chemical means. This two-step process has formed the classification of nonwoven structures, i.e. carded, airlaid, spunlaid, meltblown, needlepunched, hydroentangled, adhesive bonded, thermal bonded, stitch bonded, etc. Some of the important processes that are used for the manufacture of nonwoven geotextiles are discussed below. 

Mechanical bonding. This can be classified into two categories, needlepunching and hydroentanglement. Needlepunching is a physical method of mechanically interlocking fibrous... 

Hydroentangling n. Process for forming a fabric by mechanically wrapping and knotting fibers in a web through the use of high-velocity jets or curtains of water. Also see spunlaces fabric. 

Mao N and Russell S J (2006), A framework for determining the bonding intensity in hydroentangled nonwoven fabrics , Comp Sci Tecfi, 66(1), 80-91. 

The Nomex family products consists of staple fibres, continuous filament yarns, paper, woven, hydroentangled and coated fabrics, and they are used in firefighter garments insulation in fire resistant thermal protective apparel and apparel fabrics to protect against flash fire and electric arc exposure. Examples of DuPont Nomex fibres suitable for protective clothing are summarized in Table 3.3 below. 

Our laboratory equipment allows the making of reclaimed fibres into yams. We have both rotor spinning and yam-covering spinning units available. In addition, there are several plants to make nonwovens. Both mechanical and aerodynamic web formation are possible. We use mechanical as well as thermochemical processes to fix the webs (needle-punching, hydroentangling, meshing to a variety of processes, thermofixation, thermofusion). 

Nonwoven Manufacturing. Cotton staple is readily processed to form carded, air laid, or carded/crossed-lapped webs that can be bonded by various techniques to form useful nonwoven materials, eg, needlepunched, spimlaced (hydroentangled), and stitch-bonded nonwovens, and resin-bonded and thermal-bonded carded fabrics (68). Many times a combination of these processes is used to produce hybrid structures and other products. Cotton s share of the nonwovens market in 2002 is 7.8% globally and 2.8% in North America (69). In 2000-2001, 32-36 million kg (70-80 million lb) of cotton was used in North America to... 

A nonwoven fabric is a textile structure made from fibers, without a yam being first made knitted and woven fabrics, require yams. A nonwoven fabric normally comprises a network of fibers or continuous filament yams strengthened by mechanical, chemical, or thermally interlocking processes. Examples are bonding with hinders such as latex polymers, needling, hydroentanglement, and stitchbonding. 

HydrOGntanglement. This is a generic term for a nonwoven process that can be used for web consolidation, fabric surface-texturing purposes, or both. The mechanism is one of fiber rearrangement within a preformed web by means of fluid forces. When used for bonding, hydroentanglement repositions individual fibers... 

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