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Measurement of Crimp Characteristics of Jute Fiber at Different Concentration of Caustic Soda.

Latifa Binte Lutfar
Scientific Officer
Physics Department, Physics and Testing Division, BJRI, Technology Wing, Manik Mia Avenue, Dhaka-1207.

Abstract/ Executive Summary:

Tenacity and extension are essentially the two important parameter of jute fibers, contributing both to the behavior of fiber in processing and to properties of final products such as yarn and fabrics. In attempt to find out the role of lignin in the formation of crimps in woolenized jute fiber a bundle of raw jute of BWA was first dilignified by Callow’s method and then delignified samples were treated with 3%, 4.5%, 6%, 7.5% and 9% of caustic soda respectively. No measurable crimps were found when jute fiber were treated with 3% concentration of alkali. The crimp parameters both in amplitude and frequency increased with an appreciable deterioration in the breaking stress with the increase of alkali concentration. The jute fiber after a certain degree of delignification when treated with alkali undergoes a remarkable physical change along with a marked reduction in stiffness. Though finer strength reduces, but the increased extensibility of the fiber will be technically advantageous for producing improved quality yarns and fabrics which will ultimately causes a significant departure from the traditional uses of jute.

Keywords: Callow’s method, Delignification, Crimp, Extensibility

Location: Physics Department, Physics and Testing Division, BJRI, Technology Wing, Manik Mia Avenue, Dhaka-1207

Start Date: 01-01-1980

End Date: 30-06-1980

Program Area: Postharvest and Agro-processing

Commodity: Jute

Objectives:

1.To assess the crimp properties in the jute fiber using caustic soda.

2.. To study the physical properties of treated fiber.

Methodology:

Lignin was first remove from the BWA jute fibers and then they were treated with caustic soda of different concentrations (3%, 4.5%, 6%, 7.5% and 9%). In continuation to that study, whiteness and luster of those treated samples were measured with a calorimeter such as a Lukometer using green filter and 100% black reflectance. The stress strain characteristics (breaking tenacity, percentage of extension at break and linear density in tes) of the fiber were also measured with the help of INSTRON, a tensile tester, whereas as earlier an improved method was adopted to study these stress strain characteristics in the testing department of BJRI during 1980 at standard room temperature and humidity conditions.

Source of Information: Annual Technical Report 1980: 93-99 Abstract: 21

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It was found that the mean value of both luster and whiteness were maximum for control one. The sample without any treatment and then gradually decreased with the increase of woolenisation except 7.5% chemical concentration. A remarkable change occurred in tenacity value when partially dilignified fibers were treated with alkali solution. The value increased with a great extent at 3% up to 6%. After 6% the value gradually decreased with the increase of percentage of alkali concentration. It was also observed that the percentage of extension were almost in an ascending order with the increase of the percentage of alkali concentration with the exception at 3%. The constant tenacity and extension indicated same effect of both the percentage of alkali concentration on delignified fibers.

Knowledge Management: Report/Proceedings