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Introduction to Polymer and Macromolecule (VIVA question and Details) Mer –   The repeating unit in a polymer chain Monomer –   A single mer unit (n=1) Polymer –   Many mer-units along a chain (n=103 or more) Degree of Polymerization –   The average number of mer-units in a chain. POLYMER : Polymer is a type of macromolecule consist by covalent bond of a large number of repeating number. Polymer means many monomer. Monomer: A monomer is a molecule that is able to bond in long chains. Degree Of Polymerization: It is a average number of repeating number in a macromolecule. The importance of polymer science to study for Textile Engineering . 1.Textile fibers are polymeric substance. 2.Size materials are polymer(used in weaving). 3.Printing thickeners are polymer. 4.Binders and fixed used in coloration with pigments are also polymer. 5.Polymers are also used as wet processing. Macromolecule: A macromolecule is a very large molecule with a diame

Difference between Dyeing and Printing: No. Dyeing Printing 1. No localized application. Localized application. 2.   Higher liquor ratio. Less liquor ratio. 3. Thickener is not used. Thickener is used. 4. Color is applied   through solution. Color is applied through paste. 5. Only   one dye solution is used in case of dyeing application. One or more dye is used during the application of printing. 6. Fibers,yarn,fabrics are dyed by applying of dyeing   application. Printing is done on the fabric surface. 7. Perfect design is not needed here. Perfect design is must needed.   Dyeing: Dyeing is the process of imparts colors of textile material through a colorant (dyes and pigments). Colorant: Organic and inorganic materials that can impart color on textile. Dye: Dyes are colored,unsaturated organic chemical

            Our next article based on Wet processing technology. We discuss about this topic What is wet processing? Sequence of wet processing. What is dyeing? What is dye? What is chromophore? What is colorant? What is pigment? Write down the difference between colorant and pigment? What is printing? Write down the difference  between dyeing and printing? How may dyes? Which dye are most popular in bangladesh?      AND MANY TOPICS ALSO DISCUSS............................................................................................                                                      Thank you ..................

                       Acid Dye Content 1.Define/Definition 2.Sources 3.Application of acid dye 4.Uses of acid dye Acid dyes are sodium salts of sulphonic acid but there are a few containing carboxyl groups. The acid dyes have direct affinity towards protein fibers and polyamide fibers. An  acid dye  is a dye that is typically applied to a textile at low pH. They are mainly used to dye wool, not cotton fabrics. Some acid dyes are used as food colorants Sources: The name “Acid dye” gives some insight into its chemical composition. As the name implies, acid dyes consist of acidic molecular groups that characterize the compounds. The process of using acid dyes predominantly takes place in water, when the acid dye is dissolved and therefore able to interact with the material being colored. Historically, acid dyes were most commonly used to dye materials consisting of protein fibers. The acidic pH of the dye-bath allows the dye molecules to bond to the protein fibers.

      YARN MANUFACTURING   TECHNOLOGY LAB-2 Experiment:1 EXP. NAME: Study on gearing diagram of a Drawframe Machine. Introduction /Theory: Drawframe  is a machine for combining and drawing slivers of a textile fiber (as of hemp for rope manufacture or cotton for spinning). Drawing  is the operation by which slivers are blended, doubled and leveled. In short staple spinning the term is only applied to the process at a It is a process of yarn manufacturing in which the sliver is elongated when passes through pairs of rollers, each pair moving faster than the previous one.This permits combination of several slivers. These slivers are drawn and elongated to straighten and create greater uniformity.There are two types of draw frame 1.     Draw frame -1/Pre-comb drawing/Breaker draw frame 2.     Draw frame -2/Post-comb drawing/Finisher draw frame Objectives of Draw Frame: 1. To straighten the fibres in the slivers. 2. To make them lie in a manner parallel to their