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Cupro, FibrFibr celulozic artificial, numit i secundar. Este o fibr din celuloz regenerat, obinut prin procedeul cuproamoniacal, prindizolvarea celulozei n soluie de hidroxid tetraaminocupric (reactiv Schweitzer). Actualmente urmeaznlocuirea procedeului cupro cuprocedeul viscoz (care utilizeaz soda caustic). Fibra cupro are o structur i un comportament analog viscozei, densitatea este de 1,5g/cm3. Are o seciune circular i prezint o suprafa lucioas regulat. Fibra arde i degaj miros de amoniac, nu este atacat de insectesau microorganisme. Fibra are tueu mtsos, o bun rezisten la uzur i lumin, o rezisten sczut n mediu umed, cu capacitate marede vopsire. A fost cunoscut la nceput cu denumirea de mtaseBemberg. Fibra se folosete n principal la fabricarea de cptueli, ntr-o

gam larg de structuri (tafta, crep etc.). Astzi, fibrele cupro sunt produse numai n Japonia i Italia (pn n 1960 au fost produse nGermania de Vest de firma Bayer iar pn n 1990 de firma Pirna n Germania de Est). Producia mondial de fibre cupro, n anul 2000 erade cca. 30.000 tone.

Cuprammonium rayon

Merrium-Webster defines Cuprammonium rayon as "arayonmade

fromcellulosedissolved incuprammoniumsolution"

It is produced by making cellulose a soluble compound by combining it

withcopperandammonia. The solution of this material incaustic sodais passed

through thespinneretand the cellulose is regenerated in the hardening baths that

remove the copper and ammonia and neutralize the caustic soda. Cuprammonium

rayon is usually made in fine filaments that are used in lightweight summer dresses and

blouses, sometimes in Combination withcottonto make textured fabrics with slubbed,

uneven surfaces.

Properties

There are many properties of cuprammonium rayon

Produce a softsilklike handle

Very fine

Has same properties as cotton except the average DP is lower, and a larger part ofthis fibre is occupied by amorphous region.

It burns rapidly and chars at 180 deg C.

On ignition, it leaves behind ash containing copper.

Production

The polymer cuprammonium rayon is produced usingsodium hydroxide,ammonium

hydroxide,copper sulfate, andpaper.

Note: Cellulose is actually dissolved in [Cu(NH3)4](OH)2 solution and then

regenerated as rayon when extruded intosulfuric acid.

Cupro fabric is somewhat similar to viscose and tencel in that it is reprocessed

cellulose. Specifically, cupro is a recycled cotton cellulose fiber. Cupro fabric

breathes like cotton, drapes beautifully, and feels like silk on your skin. Its slinky,

curve-hugging drape makes it great for elegant dresses, skirts, pants and blouses.

http://en.wikipedia.org/wiki/Rayonhttp://en.wikipedia.org/wiki/Rayonhttp://en.wikipedia.org/wiki/Rayonhttp://en.wikipedia.org/wiki/Cellulosehttp://en.wikipedia.org/wiki/Cellulosehttp://en.wikipedia.org/wiki/Cellulosehttp://en.wikipedia.org/wiki/Cuprammoniumhttp://en.wikipedia.org/wiki/Cuprammoniumhttp://en.wikipedia.org/wiki/Cuprammoniumhttp://en.wikipedia.org/wiki/Copperhttp://en.wikipedia.org/wiki/Copperhttp://en.wikipedia.org/wiki/Copperhttp://en.wikipedia.org/wiki/Ammoniahttp://en.wikipedia.org/wiki/Ammoniahttp://en.wikipedia.org/wiki/Ammoniahttp://en.wikipedia.org/wiki/Caustic_sodahttp://en.wikipedia.org/wiki/Caustic_sodahttp://en.wikipedia.org/wiki/Caustic_sodahttp://en.wikipedia.org/wiki/Spinnerethttp://en.wikipedia.org/wiki/Spinnerethttp://en.wikipedia.org/wiki/Spinnerethttp://en.wikipedia.org/wiki/Cottonhttp://en.wikipedia.org/wiki/Cottonhttp://en.wikipedia.org/wiki/Cottonhttp://en.wikipedia.org/wiki/Silkhttp://en.wikipedia.org/wiki/Silkhttp://en.wikipedia.org/wiki/Silkhttp://en.wikipedia.org/wiki/Sodium_hydroxidehttp://en.wikipedia.org/wiki/Sodium_hydroxidehttp://en.wikipedia.org/wiki/Sodium_hydroxidehttp://en.wikipedia.org/wiki/Ammonium_hydroxidehttp://en.wikipedia.org/wiki/Ammonium_hydroxidehttp://en.wikipedia.org/wiki/Ammonium_hydroxidehttp://en.wikipedia.org/wiki/Ammonium_hydroxidehttp://en.wikipedia.org/wiki/Copper_sulfatehttp://en.wikipedia.org/wiki/Copper_sulfatehttp://en.wikipedia.org/wiki/Copper_sulfatehttp://en.wikipedia.org/wiki/Paperhttp://en.wikipedia.org/wiki/Paperhttp://en.wikipedia.org/wiki/Paperhttp://en.wikipedia.org/wiki/Sulfuric_acidhttp://en.wikipedia.org/wiki/Sulfuric_acidhttp://en.wikipedia.org/wiki/Sulfuric_acidhttp://en.wikipedia.org/wiki/Sulfuric_acidhttp://en.wikipedia.org/wiki/Paperhttp://en.wikipedia.org/wiki/Copper_sulfatehttp://en.wikipedia.org/wiki/Ammonium_hydroxidehttp://en.wikipedia.org/wiki/Ammonium_hydroxidehttp://en.wikipedia.org/wiki/Sodium_hydroxidehttp://en.wikipedia.org/wiki/Silkhttp://en.wikipedia.org/wiki/Cottonhttp://en.wikipedia.org/wiki/Spinnerethttp://en.wikipedia.org/wiki/Caustic_sodahttp://en.wikipedia.org/wiki/Ammoniahttp://en.wikipedia.org/wiki/Copperhttp://en.wikipedia.org/wiki/Cuprammoniumhttp://en.wikipedia.org/wiki/Cellulosehttp://en.wikipedia.org/wiki/Rayon