This quiz contains multiple choice question related to Fiber testing in textile testing. Each question is on 1 mark each and no negative marking and its free of cost so, practice and check your knowledge 👍. (click on read more below)
Cotton
Cotton consists of practically pure cellulose and may be chemically
described as poly (1, 4-B-D- anhydroglucopyranose).
The helical reversal structure of natural cellulose shows the
constantly recurring cellobiose unit, consisting of two glucose units
each with six carbon atoms. The length of unit cell along the fibre
axis is 10.4A calculated for the cellobiose unit.
In natural cellulosic fibres there are 3000 - 5000 C6 or glucose
units joined together. This corresponds to a molecular weight of
the order of 300,000 -500,000.
Proteins
Nitrogenous compounds:
- Present in primary cell wall and lumen.
- Yellow colour of cotton is due to presence of proteins and some colouring matter.
WARPING
OBJECTIVE
- Forming a parallel sheet of yarn onto a warpers beam or section beam from single end packages.
- Cones winding for warping is done at higher tension.
- Static eliminator device is used for yarn producing high static charge.
- Direct warping is done mostly when sizing is required and large number of ends are required in weaver’s beam.
- Section warping usually done if sizing is not required.
- Winding speed : Upto 1200 mpm
- Beam Diameter : 800 to 1600 mm
- Width of machine : 1400 to 2600 mm
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