CLASS - VIII-DGROUP- 4

Trade name for a synthetic polyester fibre produced by the chemicals company ICI. It is made by polymerizing ethylene glycol and

terephthalic acid. Cloth made from Terylene keeps its shape after washing and hard

wearing.Terylene was the first wholly synthetic fibre

invented in Britain. It was created by the chemist J R Whinfield of Accrington in 1941. In 1942 the rights were sold to ICI (DuPont in the USA, where it is called Dacron) and

bulk production began in 1955. Since 1970 it has been the most widely produced

synthetic fibre, often under the generic name polyester. In 1989 8.4 million tonnes were produced, constituting over 50% of

world synthetic fibre output. RICHA8D 24

Molten or viscous terylene molecules are forced through spinneret holes in the form of jets which gives rise to terylene threads. Tetraphthalic acid is a dicarboxylic acid, that is it has two –COOH groups. It reacts with ethylene glycol that has two –OH groups to give an ethylene type ester. The polymerization reaction gives polyester and water. This particular polyester is called terylene. The reaction is shown above. MANSI 19-

Mansi19

TERYLENEThe invention discloses a production process for a directly-spun terylene industrial filament of a liquid-phase tackifying fusant , belonging to the technical field of spinning. The production process includes the following steps: esterification , polycondensation, liquid-phase tackification and spinning. The production process is characterized in that: in a vertical reaction kettle, liquid-phase tackfication is carried out on the fusant obtained through esterification and polycondensation of glycol and phthalic acid; the vertical reaction kettle adopts a tower type film forming structure; the fusant enters the vertical reaction kettle from the top part for distribution, and the film forming is naturally finished under the action of gravity; a backflow pipeline is provided for the discharging of the reaction kettle, the viscosity and flow rate of the fusant are controlled by the backflow adjusting, the intrinsic viscosity of the polyester fusant after being tackified in a liquid-phase manner is within 0.85 to 1.0dl/g, and the fusant is conveyed to a spinning box body by a gear pump for spinning. By reasonably designing the reaction kettle and allocating the process, the invention effectively solves the consistency between the fusant reacting condition and the staying time; meanwhile, the consumption of a public medium is reduced, and the cost is lowered; by optimizing the process, the invention increases the production efficiency of a system and improves the product quality.Mriga 20

FACT

** TERYLENE WAS THEVERY FIRST WHOLELY MADE

SYNTHETIC FIBRE.**

TERYLENE CLASS VIII D• GROUP 4• MANSI• MRIGA• NAKUL• NAMAN • PRIYAM• RICHA