Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Spectrophoto-meterical Method for Studying the Color, Photo Degradation, Washing and Dye Fastness of Jute and Its Products.

Kazi Md. Ahmed Karim
Principal Scientific Officer
Physics Department, Physics and Testing Division, BJRI, Technology Wing, Manik Mia Avenue, Dhaka-1207

Abstract/ Executive Summary:

Much stress has been given to study the photo degradation of jute when it is exposed to direct sunlight and also when it is stored. For this reason, photochemical degradation of long jute of Tossa A and E grades were estimated by spectrophotometrical method using Xenotest machine as a source of artificial light, the emitted radiation of which is very close to sunlight in the physics department during 1980. It was found that the extent of discoloration had dependent on the exposing period as well as the amount of lignin content of the fiber. Both Tossa A and E grades of jute showed bleaching effect up to 250 hours, exposure beyond which they showed yellowing. Both effects were found to have been associated with strength loss of fibers. The strength of the jute fibers deterioration so much with the increase of exposure to light that on 100 hours exposure they were extremely brittle and discolored and became unsuitable for mill processing.

Keywords: Photochemical , Xenotest, Tossa, Deterioration

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:

Estimation of photochemical degradation of jute yarn and products (treated and untreated) by light and heat.

Methodology:

Tossa jute of grade A and grade E was collected in order to expose them to this light and colorimeter such as Leukometer was applied for measuring diffused reflectance values of fibers which again vary due to different periods of light exposure. The required jute fibers from top, middle and bottom portion of long jute of Tossa Grade A and E were first selected for test. The fibers were properly combed, sized and accommodated in to the specimen holder of the Xenotest machine. The sample were the subjected to the exposure of Xenon arc light of xeno test for 400 hours during which both Tossa A and E showed bleaching effect up to 250 hours and onward the samples showed yellowing effect. The variation of the diffused reflectance values due to different exposing period, were measured with the help of filter of Leukometer against MgO standard of 100% reflectance and loss of strength of fibers was noted by using Pressley index Instrument.

Source of Information: Annual Technical Report 1980: 127-131 Abstract: 18

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It was found that, the extent of discoloration depends on the exposing periods as well as on the amount of lignin contained by the fibers. When jute is exposed to light for several hours yellowing of jute occurred but when jute is found to be whitish in shade gradually in course of time on exposure of light, then it is termed as to undergo bleaching. The color of Tossa variety of jute ranges from golden to dark brown to grey. The results revealed that both Tossa A and E quality of jute showed bleaching effect up to 250 hours exposure while on further exposure they showed yellowing. More bleaching indicates more reflectance whereas more yellowing denotes less reflectance. It also revealed that both bleaching and yellowing of jute is associated with the strength loss of fiber. If both deterioration of strength and discoloration of jute could be prevented, the values and reliability of many jute goods could be considerably enhanced.

Knowledge Management: Report/Proceedings