Stock material or miscellaneous articles – Structurally defined web or sheet – Including grain – strips – or filamentary elements in...
Patent
1996-04-03
1998-06-16
Weisberger, Richard
Stock material or miscellaneous articles
Structurally defined web or sheet
Including grain, strips, or filamentary elements in...
428105, 428109, 428111, 428114, 428902, 428911, 442236, 442394, 264510, 264DIG47, 2642971, 264241, B32B 512, B29C 7050
Patent
active
057667250
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a composite web. In the context of this invention a composite web is understood to mean an elongated, flat object of indeterminate length which comprises one elongated composite layer of mutually parallel fibres in a matrix.
WO-A-91/12136 discloses an elongated two-layer composite structure, in which the first layer consists of fibres in a matrix which run in the lengthwise direction of the structure, and the second layer consists of fibres in a matrix which run at right angles to said lengthwise direction. Such a two-layer structure, in which the fibres in the various layers run in different directions, from here onwards is called a cross-layered web. A composite web in which the fibres run parallel to the lengthwise direction of the web from here onwards is described as a parallel web. In WO-A-91/12136 the second layer is produced by cutting rectangular pieces off a parallel web, the length of which pieces is essentially the same as the width of the parallel web, and laying said pieces one after the other on another parallel web, with the fibres running at right angles to the lengthwise direction of said web. After this, the composite layers are firmly connected to each other under the influence of pressure and heat.
It is technically very difficult to lay the abovementioned cut-off pieces in a continuous process accurately joined up at the desired angle without the successive pieces overlapping, with the result that thickened parts are produced, or without spaces (gaps) remaining between the successive pieces. Moreover, loose pieces of composite layer with parallel fibres are difficult to handle, because they tear easily in the direction of the fibre. This is particularly the case if the composite layer is very thin and has a high fibre content such as is desirable for use, for example, in anti-ballistic composites.
There is therefore a need for a composite web, in addition to the already existing parallel web, in which the fibres in the composite layer run at an angle differing from 0.degree. relative to the lengthwise direction of the web, which composite web has fewer or none of the abovementioned disadvantages and drawbacks in the production of multi-layer composite structures, such as, for example, a cross-layered web.
This need is met according to the invention by a composite web (3) which in the lengthwise direction is made up of joined-up and connected web parts (7), layer (4) of mutually parallel fibres (5) in a matrix (6), the composite layer of each web part being bounded by two transverse sides (1) and (2) lying opposite each other and running parallel to the fibres, layer of each web part facing and parallel to transverse side (2) of the composite layer of the joined-up web part, and with the fibres in the web parts at an angle .alpha. (differing from 0.degree.) to the lengthwise direction of the composite web, connected to each other.
The composite web according to the invention, which is called a transverse web below, can be used for the continuous production of multi-layer composites by simple techniques.
A further advantage of the transverse web is that through the presence of the separating layer as a support, the composite layer is easy to handle, without the risk of the composite layer tearing. This means that the composite layer can be very thin, and a smaller quantity of matrix material is sufficient to bind the fibres in the composite layer, with the result that the composite layer can have a higher fibre content. This is an advantage in particular for achieving a high protection level in multi-layer anti-ballistic composites. Here and below, "the separating layer of the transverse web" is meant to convey the total interconnected separating layers of the web parts of the transverse web.
Another important feature of the transverse web is that after removal of the separating layer of the transverse web, the composite layers of the connected web parts have no overlap, and thus no local thickened parts at the position where the web parts are connected. An adva
Hogenboom Eric H. M.
Van Den Aker Martinus C. A.
Van Gorp Engelbertus H. M.
DSM N.V.
Weisberger Richard
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