Acoustics – Sound-modifying means – Mechanical vibration attenuator
Patent
1998-01-07
1999-11-16
Dang, Khanh
Acoustics
Sound-modifying means
Mechanical vibration attenuator
181290, F16F 1500
Patent
active
059840439
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a magnetisable flat insulating member with an insulating layer deadening or insulating acoustic waves from articles, and to an adhesive.
Such magnetisable insulating members are already known (DE-37 11 810 A1, DE-AS 12 09 319, U.S. Pat. No. 4,010,818). They are used particularly as "sound-deadening films" in automobile technology for preventing drumming of the sheet metal parts, particularly body parts, covered therewith, and are also used for deadening body noise. Barium ferrite is disposed as magnetisable particles with bitumen in the insulating or deadening insulating layer, which has to fulfil the purpose of "sound-deadening". In order that such sound-deadening films can be easily and as far as possible permanently attached in the body parts, the underside of the insulating layer having the magnetisable particles is provided with an adhesive layer, which has a hot melt, i.e. a compound becoming adhesive upon the application of heat, or a pressure-sensitive adhesive, i.e. a self-adhesive. Magnetic strip compound layers with non-magnetic films are also known. The proportion of magnetisable particles, i.e. barium ferrite, on the flat insulating member comes to more than 50% by weight, so that the acoustic properties as regards sound insulating or sound deadening by the bitumen layer are impaired. Until now however this disadvantage has been accepted, as the magnetic efficiency improves the attachment to tightly curved or corrugated under surfaces, for example in the floor area of automobile doors, in comparison to such sound-deadening films or sound-deadening matting, which have a self-adhesive layer on the insulating or deadening layer, without using magnetic particles. Even the latest developments in bituminous magnetic films, which are provided with a pressure sensitive adhesive layer, do not improve the previously known systems to a sufficient degree.
The object underlying the invention is to improve a magnetisable flat insulating member of the type already mentioned in that, being simple and cost-effective to manufacture, it may likewise be simply and easily permanently attached to the relevant article, and in addition the insulating or deadening properties are substantially unimpaired.
The invention relating to the magnetisable flat insulating member characterized in having an external adhesive layer, for which an aqueous dispersion is used as the binding layer, and in which magnetizable particles are embedded. According to this, the magnetisable particles are not integrated in the insulating layer, but in the adhesive layer, using binding agents. By virtue of the fact that the layer essential for the insulating and deadening purposes is no longer "charged" with magnetisable particles, the acoustic properties can be better controlled, which above all becomes apparent in a wider frequency spectrum of the waves to be insulated or deadened. In addition, it has also however become apparent that by means of introducing the magnetisable particles only into the adhesive layer, a further important advantage is obtained. The magnetic efficiency is substantially improved, although less and even more cost-effective magnetisable material can be used. In comparison with the thickness, there is an advantage in quantity as regard the entire quantity of ferrite. Thus, due to the comparatively thin adhesive layer, practically all the magnetic material can become effective as regards its magnetic adhesive effect, as the adhesive layer is in the closest vicinity to the article such as body metal, upon which the flat insulating member is attached. Correspondingly, the proportion of magnetisable particles in the entire insulating member is less. Despite their introduction only into the adhesive layer, at that point there are used preferably between 20 and 80% by weight, particularly between 30 and 65% by weight of magnetisable particles. The proportion of the same in the overall insulating member is thus substantially less.
In addition to this, in comparison to the prior art already mentioned, i
REFERENCES:
patent: 3424270 (1969-01-01), Hartman et al.
patent: 5300355 (1994-04-01), Mifune et al.
patent: 5695867 (1997-12-01), Saitoh et al.
Lahner Stefan
Roller Manfred
Ruhe Thomas
Wagner Max
Dang Khanh
M. Faist GmbH & Co. KG
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