Fishing and Gear Technology

Unit-3 Construction of twines

3.2.Basic fibre forms

Continuous filaments: These are fibres of indefinite length and they are silk like in appearance and are produced with different degrees of fineness. Generally much thinner than 0.05 mm diameter. Fishing gear is usually made of filament a 1000 m of which weigh between 0.6-0.2 g. eg.PA.

Staple fibres: These are discontinuous fibre, usually prepared by cutting filament into length suitable for the yarn spinning process. Fineness is similar to that of continuous filament but length varies for 40-120 mm. These short fibres are held under pressure to form continuous strand which is called as single yarn. Netting yarn made out of staple fibre have a rough surface owing to the numerous loose ends of fibre sticking out from the twine. This hairy nature decreases the slippage of knots. Staple fibre has lesser breaking strength than continuous filament.

Monofilament: This is a single filament which is strong enough to function as a yarn; without any further processing. Transparent P.A monofilament are used in gillnets. These are stiff, larger in diameter, transparent and less visible.

Split fibres: are developed recently. These are originated from plastic tapes, which are stretched during manufacture to the extent that tape split longitudinally when under pressure. Yarn made of these filaments contains fibres of irregular fineness.