Scouring polyamides

Polyamides (nylons) are thermoplastic fibers that retain their form produced by heat treatment. They are usually given an alkaline scour and then heat-set. The heat-setting treatment is conducted at ca 10°C above the subsequent wet processiag steps this ensures good form retention after processiag. Woven fabrics are usually heat-set on a contact heat-setting machine and nylon tricot is generally heat-set on a tenter frame or ia steam chambers. 

Polyamide and polyester fibres are generally scoured using an alkyl poly(oxyethylene) sulphate and sodium carbonate. Some polyester qualities are subjected to a causticisation treatment with sodium hydroxide in the presence of a cationic surfactant to give a lighter fabric with a silkier handle [154,156]. This treatment involves etching (localised saponification) of the polyester surface and is broadly analogous to the S-finish used on triacetate fibres. The process has attracted considerable interest in recent years but its... 

Different methods are proposed in the literature to construct disc electrodes, but the commonly used way is embedding a rod of the electrode material in an insulating material such as glass, polyamides, acrlyates, epoxy resins or polyvinylchloride. The electrodes used in the work described in this book were constructed by insulating the electrode material in epoxy resin (Fig. 1.7). First, a copper piece was made with a hole for the positioning of the electrode material rod. This was positioned in a PVC holder, which was then filled with epoxy resin. After curing for 48 h, the PVC mantel was removed and the excess of epoxy scoured away on emery paper. 

Koulouri, E.G., E.C. Scourlis, and J.K. Kallitsis, Characterization of melt-mixed blends of poly(ether-ester) with various polyamides. Polymer, 40(17) p. 4887. 1999. 

Uses Scour dye assistant for polyamide and polyamide/lycra goods... 

Uses In-dyebath scouring agent for polyamide/spandex fibers, esp. in hosiery and foundation garments used in dyebath to scour and suspend silicone oils and prevent redeposition onto the goods Diadavin ESW 01 [TANATEX Chems.)... 

Uses Detergent with high foaming and soil-suspending props, for scouring cotton/ elastomeric and polyamide/elastomeric blends... 

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