Static structures (e.g. – buildings) – With synthetic resinous component – With nonresinous component
Patent
1998-05-18
2000-10-17
Kent, Christopher T.
Static structures (e.g., buildings)
With synthetic resinous component
With nonresinous component
52409, 156178, 428489, E04D 510
Patent
active
061313513
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to a synthetic textile support for bituminous sheaths, particularly for coating roofs.
The usage is well known in the art of manufacturing bituminous sheaths, such as those habitually used for coating roofs, of a synthetic textile support consisting of a non-woven lap of polyester staple or continuous thread fibre with an essentially transversal orientation.
For many years now, with the object of avoiding transversal shrinkage of the textile support when it is subjected to impregnation in bitumen, obtained by means of the passage under tension through a bitumen bath at high temperature, the same Applicant has inserted between two layers of traditional lap a thin layer of polyester fibre with filaments about 70 mm long arranged parallel to one another in the longitudinal direction of the textile support.
This solution has allowed the solution of the problem of transversal shrinkage during the step of impregnation in bitumen, but it has proved not very effective against another important problem, that arises after the bituminous sheath has been laid and that is represented by the response of the sheath to the thermal expansion during the summer of the roof that receives it. Due to the effect of such expansions, in fact, the bitumen softens up and the textile support tends to shorten due to the effect of the strain to which it has been subjected during processing.
From the Italian patent No. 1,237,149 and the corresponding U.S. Pat. No. 5,118,550 a synthetic textile support for bituminous sheaths is known, wherein a plurality of parallel continuous glass filaments is interposed and made to extend longitudinally between two layers of polyester fibre non-woven with the object of ensuring a suitable longitudinal reinforcement for the synthetic textile support.
The glass filaments, characterized by a high Young's modulus, exhibit on the other hand the drawback of representing a substantially rigid support that has a very good resistance to tractions up to a certain limit, but then breaks suddenly leaving the textile support without any longitudinal reinforcement. Moreover, even before it breaks, they react to the thermal expansions of the roof in a clearly different manner with respect to the polyester non-woven surrounding them, determining the creation of a series of ripples between one filament and the next. Lastly it is obvious that the usage of glass filaments implies during processing the presence of glass particles that cause harmful irritations to the operators, much as it creates obvious problems in the recovery of scraps and the disposal of waste.
In view of this state of the art, the object of the present invention has been that of providing a synthetic support for bituminous sheaths, that avoids transversal shrinkages of the product during impregnation and that stand up well and in an elastic manner to the thermal expansions of the roof after it has been laid.
According to the invention such object has been achieved with a synthetic textile support consisting of two layers of non-woven lap of polyester fibres, between which there is interposed a plurality of continuous reinforcing filaments arranged parallel to one another in the longitudinal direction of the textile support, characterized in that said continuous reinforcing filaments consist of polyester threads with a Young's modulus of less than 20 Gpa.
It has been possible to observe such a polyester reinforcement allows the textile support according to the invention to solve the problem of the products transversal shrinkage during impregnation in bitumen and at the same time to go along elastically with the thermal expansions of the roof after the bituminous sheath has been laid, extending and contracting in the same manner as the surrounding polyester lap and ensuring a resistance to extension that is less critical than that of the glass threads.
On the other hand, with respect to the product with the glass reinforcement threads of the known art, the textile support according to the invention also has t
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patent: 4230762 (1980-10-01), Iwasaki et al.
patent: 4762744 (1988-08-01), Woiceshyn et al.
patent: 5118550 (1992-06-01), Baravian et al.
patent: 5439726 (1995-08-01), Woiceshyn
Freudenberg Politex S.R.L.
Kent Christopher T.
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