Coating processes – Immersion or partial immersion – Inorganic base
Patent
1998-07-16
1999-11-23
Beck, Shrive
Coating processes
Immersion or partial immersion
Inorganic base
4274346, 428378, 428392, 428396, B05D 118, D02G 100
Patent
active
059896469
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of manufacturing wax impregnated rope.
In particular for fishing equipment such as nets and trawl bags and the like it is desirable that the ropes used for the forming or binding of these objects are as ductile and handy as possible and very important that they maintain their strength and dimension during long time of use. The ropes for this purpose are normally made from artificial material, mostly of Nylon.
For preserving the strength and the knot stability of a rope and for making it wear resistant it is known to effect a wax treatment thereof in connection with the rope production. This also has the purpose to make the rope more ductile and handy.
Another purpose of such a treatment is to prevent that the rope, when used in water e.g. for fishing, takes up water and thus becomes heavier and more difficult to handle, while also its tensile strength decreases. Moreover, a wax treatment of the rope may prevent sand particles from entering the rope, where the sand, in use, may wear on the filaments of the rope such that the strength of the rope is reduced, resulting in rupture hazards with potential, very serious consequences. Also, the wax treatment will reduce the internal friction in the rope as the filaments can more easily slide on each other when the rope is stretched, slackened or bent.
Thus, for an efficient treatment of the rope it is desirable to achieve an impregnation, whereby the wax is deposited between and around the filaments of the rope. It is a possibility to arrange a current waxing of the filaments or strands of which the rope is made, as these may be guided briefly through a bath with warm, liquid wax. This may result in a fine impregnation, but normally the method will imply noticeable difficulties in the rope production, where unconvenient wax deposits are liable to occur at critical places of the machinery, while also the generally wax greasy filaments are difficult to handle in the production of the rope.
It has been found more suitable, therefore, that it is the finished rope that is subjected to the impregnation treatment. In this connection, the rope should not only be surface treated, but deep impregnated, and according to GB 1,296,339 it has even been suggested to make use of a real pressure impregnation, inasfar as it is proposed that a multi core cable to be correspondingly treated is moved through a treating chamber to which an impregnation agent is supplied under pressure. In connection with rope, however, it has not been found necessary to use such a method, because a sufficient wax intrusion may be achieved solely by passing the rope through a wax bath through a suitable distance or duration.
In both cases, however, there will be left a noticeable wax coating on the outer surface of the rope. It is attractive that the rope be feelable as being `wax impregnated`, but this is soon turned into a drawback if a real wax layer is exposed on the surface, even if the layer is very thin. It is possible to minimize the thickness of the layer by subjecting the rope to a scraping or by squeezing it between opposed clamping rollers, already for reducing the wax consumption, but is has been found that even hereby it is difficult to avoid the non-desired greasy character of the rope as caused by even the slightest occurrence of free wax on the surface.
It should be considered that the wax is left in a natural condition, i.e. in a solidified, semi rigid state by the cooling after the rope passage through the warm wax bath, without any kind of further fixation of curing. It is known to use other, environmentally and operatively less attractive impregnation agents, which may be subjected to real curing, cf. U.S. Pat. No. 3,424,608 and U.S. Pat. No. 3,911,785, e.g. by a subsequent passage of the impregnated rope through a heating zone. Hereby, of course, even a remaining outer layer of the impregnation agent may be caused to become non-sticky or non-greasy, but this has no bearing on the present invention, which is concentrated on the use of enviro
REFERENCES:
patent: 3079665 (1963-03-01), Saylor
patent: 3424608 (1969-01-01), Marzocchi et al.
patent: 3911785 (1975-10-01), Hood
patent: 3960050 (1976-06-01), Eisler
patent: 5180325 (1993-01-01), Eddins et al.
A/S N.P. Utzon
Beck Shrive
Calcagni Jennifer
Safran David S.
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