NOPR Collection:

Bleaching of cotton fabrics using hydrogen peroxide produced by glucose oxidase

2010-09-13T16:30:55Z

Title: Bleaching of cotton fabrics using hydrogen peroxide produced by glucose oxidase Authors: Saravanan, D; Vasanthi, N S; Raja, K Senthil; Das, Arunava; Ramachandran, T Abstract: Bleaching effect of cotton fabrics using hydrogen peroxide produced by glucose oxidase enzyme from Aspergillus niger has been studied. It is observed that enzymes are highly active at acidic pH under room temperature in terms of peroxide release during the reaction. Incomplete conversion of glucose by the enzyme results in discolouration of the reaction bath and the fabrics under alkaline pH conditions. External supply of oxygen and mechanical agitation during initial stage of reaction influence the conversion of glucose into hydrogen peroxide and whiteness index of bleached samples. Page(s): 281-283

A new energy efficient process with solar water heating system for multiend silk reeling unit

2010-09-13T16:30:54Z

Title: A new energy efficient process with solar water heating system for multiend silk reeling unit Authors: Kathari, Vijaykumar P; Patil, B G; Das, Subrata Abstract: A new energy efficient process has been developed with solar water heating system for multiend silk reeling, and the energy consumption for cooking and reeling operations is calculated and compared with conventional process. It is found that in conventional process, on an average 570 L and 1000 L of water is consumed for cocoon cooking and reeling basins respectively for the production of 10 kg raw silk in 10 basin multiend reeling unit; hence, a huge amount of firewood is required to produce heat energy for processing. The new energy efficient process with solar water heating system yields a saving of 77.97% firewood consumption compared to conventional process. Page(s): 277-280

Evaluation of various techniques for extraction of natural colorants from pomegranate rind- Ultrasound and enzyme assisted extraction

2010-09-13T16:30:54Z

Title: Evaluation of various techniques for extraction of natural colorants from pomegranate rind- Ultrasound and enzyme assisted extraction Authors: Tiwari, Harish C; Singh, Pratibha; Mishra, Pradeep Kumar; Srivastava, Pradeep Abstract: Ultrasound, enzyme and enzyme-mediated ultrasound assisted extraction processes have been used for the extraction of dye from pomegranate rind. Optimum parameters for dye extraction are found to be pH 10, extraction time 40 min and temperature 50 °C. The yields for ultrasound, enzyme, enzyme-mediated ultrasound assisted and solvent extraction are found to be 29.2%, 26.5%, 35.6% and 8.8% respectively. The dye obtained has been used for dyeing wool and cotton, keeping the optimum dye bath concentration as 10% and 8% (w/v) respectively. The fastness properties of wool are found to be very good while that of cotton is only satisfactory. Page(s): 272-276

Synthesis and characterization of non-fluorinated copolymer emulsions for hydrophobic finishing of cotton textiles

2010-09-13T16:30:53Z

Title: Synthesis and characterization of non-fluorinated copolymer emulsions for hydrophobic finishing of cotton textiles Authors: Prusty, Anandini; Gogoi, Naminita; Jassal, Manjeet; Agrawal, Ashwini K Abstract: Non-flouro copolymers containing a hydrophobic alkyl acrylate monomer (butyl acrylate/2-ethylhexyl acrylate/ lauryl acrylate) and a reactive monomer (maleic anhydride) have been synthesized using emulsion polymerization technique. The copolymer emulsions have been applied on to cotton fabric by a pad-dry-cure process and the water repellency of the fabrics before and after vigorous washes compared. The effect of chain length of hydrophobic monomer on the water repellency has been compared and the comfort properties of the coated fabrics such as air permeability and bending length evaluated. It is observed that the copolymers prepared using long alkyl chain acrylates show promising alternatives to the repellent agents based on perfluoroalkyl chains for water repellency. Page(s): 264-271