Are cupra and viscose fibers cellulose?

Update:29-03-2021
Summary:

The difference between viscose fiber and cupra fiber: 1 […]

The difference between viscose fiber and cupra fiber:
1. α-cellulose extracted from cellulose raw materials such as wood and plant ligustrum, or cotton linters as raw materials, processed into spinning dope, dissolved in dilute lye to make viscose, and then wet Spinning; natural cellulose raw materials such as cotton linters are dissolved in a concentrated ammonia solution of copper hydroxide or alkaline copper salt to form a spinning solution. Both processes and raw materials determine their price and quality.
2. The dry strength of viscose fiber is close to that of cupra, and the wet strength of cupra is higher;
3. The viscose fiber has a zigzag cross-section with a skin-core structure, straight and vertical grooves. The cupra fiber has a round cross-section without a skin core, so the cupra fiber has a better gloss and a smooth feel, close to the silk style. ;
4. The complex technology and processability of cupra fiber determine its high-end characteristics as a man-made fiber, with low output and high price.

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