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Bleaching of jute with peracetic acid

2016-07-20T06:48:07Z

Title: Bleaching of jute with peracetic acid Authors: Mazumder, P; Sanyal, S; Dasgupta, B; Shaw, S C; Roy, T K Guha Abstract: The use of peracetic acid as a bleaching agent for jute fabrics has been investigated. The optimum bleaching results are obtained at 70°C around pH 6.5 for all the concentrations studied. A comparison of peracetic acid bleaching with the conventional peroxide bleaching shows that peracetic acid bleaching is more effective in reducing the losses in width, weight and tensile strength. The improvement in handle/feel and the low ash content of the peracetic acid bleached jute fabrics Have been attributed to silicate-free bleaching. SEM and IR studies of the bleached jute samples also show improvement in the properties of peracetic acid bleached samples. Page(s): 286-292

Effect of selective pretreatments and different resin post-treatments on jute-viscose upholstery fabric

2016-07-20T06:48:06Z

Title: Effect of selective pretreatments and different resin post-treatments on jute-viscose upholstery fabric Authors: Ghosh, P; Samanta, A K; Das, D Abstract: The effects of selective chemical pretreatments imparting texturing and bleaching separately and sequentially on 60 : 40 jute-viscose fabrics have been studied. It is observed that sequential texturing and bleaching treatments impart certain desirable property benefits over that imparted by only texturing or bleaching, particularly in respect of crease recovery, breaking extension, whiteness and brightness index, with marginal drop in tenacity. Post-treatments with urea-formaldehyde (UF), dimethyloldihydroxyethylene urea (DMDHEU), butylated urea formaldehyde (BUF) or acrylamide formaldehyde (AMF) of sequentially pretreated fabric further reduce tenacity to the extent of 5-27%; the order of tenacity drop on resin finish being UF > DMDHEU > BUF > AMF. AMF resin finish results in substantial increase in the moisture regain of the pretreated fabric, while other resin finishes lead to lowering of moisture regain. With respect to improvement increase recovery the different resins stand in the order DMDHEU AMF > UF > BUF. Considering resin uptake, crease recovery, abrasion resistance, moisture regain, tensile properties and fabric stiffness, AMF resin finish rendered 60 : 40 jute-viscose fabrics notably better suited for upholstery application. Page(s): 277-285

Microbial susceptibility of bleached and dyed jute fabrics and their protection

2016-07-20T06:48:06Z

Title: Microbial susceptibility of bleached and dyed jute fabrics and their protection Authors: Majumdar, S; Chatterjee, S K; Dey, S; Ghosh, B L Abstract: Bleached jute fabrics dyed with different classes of commonly used dyes have been tested for their mildew susceptibility and compared with undyed grey and bleached jute fabrics. Bleached jute fabrics dyed with metal-complex dyes and triphenylmethane dyes show significantly less visible fungal growth on exposure to fungal spores. Metal-complex dyed fabrics also suffer less strength loss due to mildew attack. Attempts have also been made to render jute fabrics dyed with direct dyes resistant to microbial attack by metallization with dilute solutions of copper salts. by impregnating insoluble copper salts and by treatment with benzalkonium chloride. Microbial resistance imparted and colour alteration caused by the above treatments are discussed. Page(s): 269-276

Behaviour of crosslinking on cotton fabric dyed with direct and reactive dyes

2016-07-20T06:48:06Z

Title: Behaviour of crosslinking on cotton fabric dyed with direct and reactive dyes Authors: Bhattacharyya, N; Doshi, B A; Venkataraman, A Abstract: Mercerized-bleached cotton has been dyed with direct and reactive dyes and subsequently cured with dimethyloldihydroxyethylene urea (DMDHEU) along with mixed catalyst containing magnesium chloride hexahydrate and ammonium chloride in presence of polyethylene emulsion softener. The differential behaviour of direct-dyed and reactive-dyed crosslinked cotton with respect to fastness properties, formaldehyde release, moisture regain, etc. has been discussed. Infrared, optical microscopic and X-ray diffraction studies show more crosslinking in the reactive-dyed samples as compared to that in the direct-dyed ones. Page(s): 260-268