Textiles: knitting – Fabrics or articles – Warp
Patent
1998-12-04
2000-08-22
Worrell, Danny
Textiles: knitting
Fabrics or articles
Warp
66196, 66202, D04B 2100
Patent
active
061054011
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention mainly relates to a textile structure formed in a single operation by means of one or more knitted threads and comprising two skins or layers each of which consists of rows or courses of stitches linking the two layers and a core composed of linking threads connecting the two layers.
The invention also relates to a method for manufacturing the said textile structure.
The knitted textile structure of the invention can be used in many industrial sectors.
Purely as an example, when the knitted thread or threads composing the textile structure are dry or non-impregnated various applications are possible, particularly in the field of heat insulation for uses such as clothing, flexible fireproof barrier, etc. and in the field of anti-shrapnel protective clothing. Moreover, when the knitted thread or threads composing the textile structure are impregnated with an organic matrix to produce a composite material suitable for use at low temperatures (below 400.degree. C.) the said composite material may be used to construct sandwich panels of any format capable of being curved along one or more axes. In particular, this type of panel may be used to carry a fluid such as coolant. They may also be used for producing an inflatable structure or anti-ballistic shielding structure. Filling the core of the structure with a suitable material also makes it possible to construct particularly efficient thermal protection structures.
Lastly, when the knitted thread or threads are impregnated with a ceramic or carbon matrix to give the textile structure the characteristics of a refractory composite material, the material may particularly be used to construct support structures for carbon--carbon composite optical structures for use in the aerospace industry or to construct refractory radomes for high-resolution radar systems.
BACKGROUND ART
For many years sandwich structures have been produced comprising honeycomb or foam cores both surfaces of which are covered by a panel composed of several layers of fabric impregnated with polymerized resin.
These sandwich structures are extremely light while having good mechanical resistance to compression and flexion. However, the fact that they are constructed by combining three separate components limits their cohesion and it is not possible to adapt the mechanical properties of the structure to precise specifications. Furthermore, traditional sandwich structures have to be planar.
There have also been proposals for a textile structure comprising a core covered by two layers produced in a single operation. More precisely, proposals have been made to produce a composite sandwich structure composed of a velvet construction consisting of two foundation warps and one pile warp before the latter is cut to obtain two separate pieces of fabric.
Although this type of textile structure has the advantage of being easily produced in a single operation and of giving greater cohesion than a standard sandwich structure, the construction of non-planar panels remains virtually impossible in practice due to the use of a weaving method that requires the warp and weft threads to be kept taut. This phenomenon is exaggerated by the simultaneous construction of two textile surfaces and a network of threads connecting the said surfaces.
Moreover, in a textile structure produced using this method it is very difficult to control the orientation of the linking threads constituting the core of the structure and thus to adapt the mechanical properties of the structure to precise specifications.
Document number WO-A-92 13125 also proposes to construct thermal insulation panels using a textile armature constructed in a single knitting operation and comprising two knitted layers linked to one another by a network of linking threads.
Compared with a woven textile structure, this type of knitted textile structure has the advantage of being capable of being shaped, making it possible to produce non-planar panels with single or multiple curvature. The knitting technique cause
REFERENCES:
patent: 4601940 (1986-07-01), Fischer
patent: 4785558 (1988-11-01), Shiomura
patent: 4787219 (1988-11-01), Sato et al.
patent: 5077837 (1992-01-01), Meistrell
patent: 5385036 (1995-01-01), Spillane et al.
Chadeyron Patrick
Schiano Eric
Schiano Felix
Commissariat a l''Energie Atomique
Worrell Danny
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