Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1987-12-08
1991-11-12
Woo, Jay H.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156175, B29D 2322
Patent
active
050644912
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a process employing a shaped supporting mold comprising a plurality of grooves for manufacturing shaped curved bars having a constant or non-constant cross section, made of a material reinforced with filaments, and to a unitized assembly comprising the supporting mold with at least two shaped curved bars.
The present invention also relates to a process and a device for facilitating installation of reinforcing bars in bodies comprising reinforcing sheeting, for bodies of revolution such as, for example, a flexible pipe whose sheeting is composed of a large number of reinforcing bars.
The present invention also relates to reinforced bodies comprising a reinforcing armature made with at least one elongated curved, shaped element reinforced with several bars, such as a supporting mold whereby the reinforced bodies can be lightweight, flexible, tight pipes having reinforcing armatures designed to withstand tractive forces and having a high degree of resistance as a result of helical winding of the shaped bars.
In for example, French patent A2 312,356, a shaping of reinforced plastic material is proposed wherein a filament mixture with a high resistance to tractive force, such as fibers of glass, carbon or organic material, and a cross-linkable plastic is added to a shaped groove forming a mold, with the shaped groove being wound on a wall of an mandrel or drum, and with the shaped element being extracted from the shaped groove after at least a partial cross-linking resulting, for example, from a heat treatment.
With the above-described proposed technique, during the production of shaped curved bars, the length of the bars produced by machine levels off rapidly because the rotational speed of the mandrel or drum is limited, primarily to reduce operating expense by using a classical impregnation technique.
In addition, the widths of the shaped curved bars that is, the dimension of the cross section along the perpendicular to the radius, with the thickness being defined as the dimension of the cross section in the direction of the radius, which in manufacturing determines the advance of the bar per turn on the mandrel, with the advance per turn being essentially equal to the width of the mold or rather the width of the bar plus the width or thickness of the radial wails of the mold directly affects the productivity of the manufacturing machine.
Thus, at a certain rotational speed such as, for example, a maximum rotational speed, or for a certain bar length production rate, the narrower the bar, the slower the rate of production of bar covering surface (the width of the bar multiplied by the length produced per unit time), and consequently the less the machine produces.
If several shaped curved bars are produced simultaneously on the same mandrel, the length of bar actually obtained is the same as the sum of the lengths of all the bars produced. Thus, production is multiplied by a factor essentially equal to the number of bars produced simultaneously, since the stabilization means such as heating can be adapted easily for such an increase in production without presenting any significant problems related to this increase and also knowing that in the case of very narrow shaped curved bars, these stabilization means are often sufficient.
This simultaneous production of several bars can be obtained by using a shaped and elongated supporting mold which comprises essentially parallel grooves running along the longitudinal axis to permit the bars to be molded at least to the cross section of the grooves, with at least one groove being partially fillable.
In addition, the use of a multi-groove supporting mold makes it possible to reduce the thickness of the supporting mold between the grooves relative to a sum of the two thicknesses of mold to a single groove, as described in French Patent A 2,312,356.
Thus, by reducing the width of the supporting mold, the cost of the mold, generally made of a heavy material can be reduced and the number of turns of the bars on
REFERENCES:
patent: 2501283 (1950-03-01), Nilsson
patent: 3387348 (1968-06-01), Kilgallon
patent: 3497413 (1970-02-01), Ullman et al.
patent: 3572023 (1971-03-01), Galonska
patent: 3943224 (1976-03-01), Drostholm
patent: 3966388 (1976-06-01), Bonavent et al.
patent: 4074958 (1978-02-01), Molenaar
Durkin II Jeremiah F.
Institut Francais du Pe'trole
Woo Jay H.
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