Fabrication des cordes

La fabrication des cordes expliquée

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Il existe un certain nombre de façons différentes de faire une corde, à partir de câbles traditionnels qui ont été utilisés par les premières civilisations égyptiennes, à travers des constructions modernes "kernmantle" (core / cover) devenues de plus en plus complexes et techniques.

CORDES TORONNEES

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3 strand – Traditional stranded rope construction. Ropes have been made in 3 strand form for thousands of years, by hand, on rope walks and today on modern compound rope machines.  4 strand ropes can also be made in the same manner and are common on continental Europe. 

L'image à droite montre une courte longueur de corde appartenant à Marlow qui a été déterrée en 1942 dans les grottes de Tura, sur les rives du Nil. Elle faisait partie d'une corde enroulée autour d'un grand bloc de taille et de forme identiques à ceux utilisés dans la construction des pyramides de Gizeh. Cependant, cette corde a été datée à 300 à 500 av. J.-C.

La caractéristique remarquable de cette corde est que les papyrus ou les roseaux du Nil sont formés en un brin et les 3 brins sont constitués par des torsions opposées (S & Z) - exactement les mêmes principes utilisés aujourd'hui.
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SIMPLE TRESSE

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8 strand (Multiplait) - Simplest braiding machine configuration, this construction gives an easily gripped knobbly construction. Examples include Multiplait Nylon for anchoring and mooring and military Fast rope.

12 strand – this construction gives a rounder and smoother form than 8 strand. Has a smaller internal void than ropes with more plaits. This is the ideal construction for rope cores and high strength braids, it’s also very easily spliced. Examples include D12, T12, V12, PS12 etc 

8 plait – (made on a 16 carrier machine) this construction produces a thick knobbly braid. Examples include 8 plait standard, 8 plait pre-stretch (with a small core) and some single braid aramids. 

 Polyester 24 fuseaux – like 12 strand but has a larger internal void. If used with no core this allows the rope to flatten more in use. Examples include D16 lash line and some single braid aramids.
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CONSTRUCTIONS DES GAINES

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Polyester 24 fuseaux – produces a knobbly cover, normally quite a thick cover so small core. Examples include excel matrix and 8 plait pre-stretch.

16 plait over 2 under 2 –made on same machine type as 8 plait, gives a smoother cover with more space for core, suits smaller core dependent ropes such as Excel Pro, Excel Racing, Fusion etc In larger sizes this construction can give a firm round rope with a small core such as Gecko arborist ropes .

Polyester 24 fuseaux – This construction gives a good balance between a thick durable cover whilst retaining space for core. Can be used in both core dependant and balanced rope designs. Spliceability is typically good. Examples include D2 and doublebraid.  

Polyester 24 fuseaux –  Similar to 24 plait, can make thinner cover though if required. Examples include D2 club, marlowbraid and Static LSK. 

Polyester 24 fuseaux – Can be made with a thinner cover than 24 plait allowing bigger/stronger core.  Harder to splice in this form though.  Thin cover doesn’t always work well in deck hardware.  Examples include Dynaline defender and Prostatic..

Polyester 24 fuseaux – Thinner cover than either 24 plait or 32 allowing bigger/stronger core.  Mainly used in in climbing ropes and chafe covers.
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