Self-spreading trawls having a high aspect ratio mouth opening

Details Self-spreading trawls having a high aspect ratio mouth opening Self-spreading trawls having a high aspect ratio mouth opening

A - Human Necessities

01

K

A01K 73/04 (2006.01) A01K 73/02 (2006.01) A01K 73/045 (2006.01) A01K 75/00 (2006.01) D02G 3/22 (2006.01)

Patent

CA 2479422

An improved self-spreading trawl (13) includes first panels (56T, 56B) which when towed through a body of water (12) separate on opposite sides of the trawl's central axis (62). Portions of panels (56T, 56B) form portions of the trawl's mouth (26). The trawl (13) also includes second panels (56P, 56S) which separate on opposite sides of the central axis (62) from the sides occupied by the panels (56T, 56B). Portions of panels (56P, 56S) form portions of the trawl's mouth (26). Regions of panels (56P, 56S) generate more outwardly directed lift than corresponding regions of the panels (56T, 56B). When towed through the body of water (12): a) a distance separating the panels (56P, 56S) exceeds; b) a distance separating the panels (56T, 56B). Also a braided product strand which includes at least 3 plaits (76, 102), at least one (76) of which is larger than the others (102), advantageously exhibits less drag and vibration.

Un chalut (13) à auto-étalement amélioré comprend des premiers panneaux (56T, 56B) qui, lorsque le chalut est tiré dans une masse d'eau (12), se séparent sur les côtés opposés de l'axe central (62) du chalut. Des parties des panneaux (56T, 56B) forment des parties de l'ouverture (26) du chalut. Le chalut (13) comprend également des deuxièmes panneaux (56P, 56S) qui se séparent sur les côtés opposés de l'axe central (62) et s'éloignent des côtés occupés par les panneaux (56T, 56B). Des parties des panneaux (56P, 56S) forment des parties de l'ouverture (26) du chalut. Des régions des panneaux (56P, 56S) produisent une flottaison dirigée plus vers l'extérieur que les régions correspondantes des panneaux (56T, 56B). Lorsque le chalut est tiré dans la masse d'eau (12): a) une distance séparant les panneaux (56P, 56S) dépasse; b) une distance séparant les panneaux (56T, 56B). Cette invention concerne également un toron de produit natté qui comprend au moins trois tresses (76, 102), dont au moins une est plus grosse que les autres (102) et qui produit avantageusement moins de force de frottement et de vibration.

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