Stock material or miscellaneous articles – Pile or nap type surface or component – Particular backing structure or composition
Patent
1996-08-26
1999-03-02
Morris, Terrel
Stock material or miscellaneous articles
Pile or nap type surface or component
Particular backing structure or composition
156 72, 296 9723, B32B 302
Patent
active
058768262
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a covering for lining acoustically excited surfaces, in particular of interior vehicle compartments, and a process for manufacturing the covering.
Shaped and foam-backed coverings, which are adapted to the vehicle floor, following the contours, for sound insulation in the passenger compartment of vehicles, have long been known. For example, DE-OS 20 06 741 describes a multi-layered sound-deadening component which consists of a shaped carpet and a correspondingly shaped weighting layer which are bonded with one another and which are mounted in a floating manner on the car body of the vehicle on a layer of dynamically soft material, such as e.g. foam material. Such a system assumes, along with the function of sound insulation, naturally also a decorative function by means of the carpet surface. In further development of carpets with foam backing, these foam backings have been so effected that they integrally contain feed channels for receiving lines for the vehicle electrical installations, as is set out in DE-PS 37 02 629.
The strict requirements on the recyclability of products are leading to a replacement of the conventional damping coverings, for vibration damping of the car body, especially in the floor group, by sound insulation with integrated carpeting, or to configuration of the damping coverings so that they are removable. Pursuing of the idea of the removability of damping coverings, either for the purposes of effecting repairs or with regard to recycling, the state of the art includes DE-OS 35 10 932 which is concerned with the configuration of the surface of sound insulating parts to be adhesive. The film-like coatings necessary for this purpose consist in substance of two-component polyurethane with sublinking. They are so configured with regard to adhesion that on the one hand they make possible an adherent coupling to the car body panels, which is a necessary prerequisite for body sound damping, and on the other hand a non-destructive removal is made possible. Finally, in accordance with DE-OS 37 10 731, there is made available a damping foam having adhesive surfaces which is likewise removable and which largely takes over the acoustic function of the conventional damping coverings.
Application of foam backing to shaped carpets in closed molds is state of the art. The products manufactured in this way are delivered in large quantities to car manufacturers and are employed in series production.
From the point of view of technical acoustics, the described sound insulation products represent mass-spring systems, with the carpet--usually in association with a weighting layer--as mass, and foam as acoustical spring. For this reason, the dynamic characteristic values of the foam, such as modulus of elasticity and the loss factor for bending vibrations are important characteristic values for the acoustic effect of the system concerned, which has the consequence that for ensuring consistent quality tests of these parameters are to be undertaken. This is required also by DIN-ISO 9000 ff, as applied in the certification procedures for supplier firms.
Total area tests of the acoustic parameters, that is the testing of a complete foam-backed carpet, are not carried out, because of the great effort associated therewith. Also, it can be assumed that because of the shaping of the test object there are effects on the measurement data itself, so that the relevant values cannot be reliably and reproducibly determined. Thus, today, small test bodies having the dimensions of length.times.width of a few centimetres are removed from defined regions--as planar as possible--of the carpet-foam system, climatically conditioned and tested for modulus of elasticity and loss factor in accordance with the bounce test or the bending vibration test (DIN-53440). In each case, a complete, shaped, completely foam-backed carpet must be available before such a test can be carried out. The disposal of faulty batches is thus, for this reason alone, very costly and significantly disrupts the course of manuf
REFERENCES:
patent: 4579764 (1986-04-01), Peoples, Jr. et al.
patent: 4828898 (1989-05-01), Bailey
Hoffmann Manfred
Oehl Heinz-Dieter
Riggers Edmund
Morris Terrel
Stankiewicz GmbH
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