Regenerated fibres

Regenerated Fibres.

1. REGENERATED FIBRES

2. Presenting By… Salman Ahmed Department of Textile Engineering Port City International University

3. CONTENTS

4. INDRODUCTION The production of regenerated cellulose fibers as early as the 1930s resulted in the generation of a new class of fibers. For several decades, the production of regenerated cellulose fibers such as viscose rayon and cuprammonium rayon was extensively done, and these fibers were considered to be ideal substitutes for the natural cellulose fibers. Traditionally, regenerated cellulose fibers were produced using wood as a source for cellulose.

5. REGENERATED FIBERS

6. LYOCELL Introduction: Lyocell is a manmade cellulosic fiber produce by regenerating cellulose fibre from out a solution of cellulose in an organic solvent. Tencel is the brand name of Lyocell . Raw Material: Cellulose. Most abundant natural resource on earth. It is obtained from wood pulp. Trees like Eucalyptus, Bamboo and Pine tree.

7. PRODUCTON PROCESS

8. PROPERTIRS Physical structure is a more rounded cross section. The structure is “Homogenous” and Dense. Soft, strong, absorbent. Wrinkle resistant. Can be hand washable. Excellent weight strength. Good drapability . Bio degradable.

9. ADVANTAGES & DISADVANTAGES Advantages: Absorvent Bio degradable Strong Resist sunlight aging adrasion Disadvantages: Susceptble to midew

10. APPLICATION Professional business wear Hosiery Casual wear Upholstery Filters Medical dressings Botanic tencel bed

11. LINEN Introduction: This fiber is obtained from the stem of the flax plant, this is an animal plant growing maximum about 40 inches. Linen is a cellulosic fibre derived from the stem of the flax plant. Much stronger and more lustrous than Cotton. One of the oldest and most expensive textiles in the world.

12. CHARACTERISTICS Comfortable to wear. Has good strength; twice as strong as cotton. Hand washable or dry cleanable. Well absorbent of dyes and prints. Varies from light weight to heavy weight. Has no static or pilling problems. In hot weather, it lowers the body temperature upto 3-4 %.

13. CHEMICAL PROPERTIES Effects of Acids: Linen fiber is damaged by highly densified acids but low dense acids does not effect is wash instantly after application of acids. Effects of Alkali: Linen has an excellent resistance to alkalis. It does not affected by the strong alkalis. Effects of Organic solvents: Linen fibre has high resistance to normal organic solvents.

14. APPLICATION Shirts, Pants, Blouses, skirts etc. Upholstry . Bedspreads. Dish towels. Table Linens.

15. MODAL Introduction: Modal is a wood pulp based cellulosic fibre , made out of pure wooden chips from the beech tree, technically as the european Schneider Zelkova tree. Raw Material: Cellulose. Wood pulp.

16. PROPERTIES Modal is a soft, smooth, and breathable fabric. Super-absorbent, plus resistant to shrinkage. Resistance to alkalis but sensible to acids. High breaking strength. Remains absorbent, soft & supple after repeated washing. Good color stability.

17. Modal Advantages Disadvantages Super-absorbent. Resistant to shrinkage High breaking strength Soft, smooth, and breathable. The color stays for long and does not fade easily. Modal doesn't really have any major disadvantages. Prone to stretching and pilling. After washing, it is necessary to iron modal clothes, just like cotton.

18. APPLICATION Towels, bath robes, underwear, bedsheets . Exhausters Conveyor belts and washing tube pipes. Wide range of textile industries.

19. ALGINATE INTRODUCTION: Alginate fibre are made from sodium alginate, which is a natural polymer extracted from brown seed. The biological function of alginate gives strength and flexibility to the algal tissue and regulate the water contant in the seaweed. RAW MATERIAL: Sodium Alginate or Calcium Alginate, Algic acid.

20. PRODUCTION PROCESS

21. PROPERTIES Flexibility: It is about 14% at a stress of 100 gm/cm2 Elasticity and elastic recovery: Alginate are highly elastic but less when compare to the agar. 97.3% elastic recovery occurs. Strength: The compressive strengths of alginate gels range from 5000-8000 gm/cm. The tear strengths vary from 350-700 gm/cm. Dimensional Stability: It is placed in water it absorbs water and swells. Shelf Life: Alginate impression material have a short self life.

22. ADVANTAGES & DISADVANTAGES ADVANTAGES It makes an accurate impression. It is easy to work with, has good vicosity and is low in adhesive quality. It is comfortable to the patient. Inexpensive to the dentiest . The process is not time consuming. DISADVANTAGES Can not be used alone for compressing the tissues. It is not accurate enough for crown.

23. APPLICATION Used for partial dentures with clasps. For making preliminary impressions for complete denture. For orthodontic and study models. For duplicating models.

24. CRABYON Introduction: The Crabyon fibre is realized with a bland of chitosan . Chitosan is a product derived from chitin, a compound of natural origin. Raw Material: Cellulose.

25. PROPERTIES Very strong antibacterial effect. Total biodegradability. Biocompatibility. High humidity absorption. Heavy metal absorption. Oil absorption inhibition.

26. ADVANTAGES Effective of antibacterial function for a long time. No change in physical properties. A lot of consideration of environment. Excellent for weak or sensitive skin.

27. APPLICATION Sports, Underwear, Socks, Uniform, Pyjamas , Ladieswear , Baby Cloths. House interior, Towels, Non Woven Fabrics.