Abstract: Netting (15) includes mesh bars (26) made from twines (11, 13) which possess physical properties that vary, change or alternate along a series of collinear mesh bars (26). The non-homogeneous media obtained by arranging in this way mesh bars (26) having varying physical properties may be configured to dampen or attenuate vibrations in the netting (15) such as harmonic oscillations (resonance). Furthermore, twines (11, 13) that attenuate vibrations may be chosen that also reduce the amount of material required to make netting (15) which has strength similar to or greater than conventional machine-made netting (15). Due to reduced vibration, the improved netting (15) lasts longer than conventional machine-made netting (15), and reduces the possibility of injury to fish which escape through a trawl's mesh cell openings.

Abstract: The present invention includes an improved method of making knotted netting panels (62) in which pairs of mesh bars (66) are knotted at intersections between lines (22, 34). The improved method includes forming a first loop (24) in the line (22) through which the line (34) helixes to form a second loop 36). Another aspect is improved knotted netting which includes at least two continuous lengths of line (22, 34) that form pairs of mesh bars (66) that are knotted together using the knot described above. A final aspect of the invention is an improved trawl that includes improved knotted netting made from twines (22, 34) that have a lay direction (IIZ” or lIS”). The lay direction (IIZ” or lIS”) of twines (22, 34) are opposite to the direction (lIS” or IIZ”) of loops forming the knots. Cambered sections (41) in the lay direction twines (22, 34) which face outward from an outer surface of the improved trawl are oriented generally toward the front and back of the trawl.

Abstract: Netting (15) includes mesh bars (26) made from twines (11, 13) which possess physical properties that vary, change or alternate along a series of collinear mesh bars (26). The non-homogeneous media obtained by arranging in this way mesh bars (26) having varying physical properties may be configured to dampen or attenuate vibrations in the netting (15) such as harmonic oscillations (resonance). Furthermore, twines (11, 13) that attenuate vibrations may be chosen that also reduce the amount of material required to make netting (15) which has strength similar to or greater than conventional machine-made netting (15). Due to reduced vibration, the improved netting (15) lasts longer than conventional machine-made netting (15), and reduces the possibility of injury to fish which escape through a trawl's mesh cell openings.