Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Reexamination Certificate
1999-09-03
2001-11-20
Theisen, Mary Lynn (Department: 1732)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
C264S112000, C264S115000, C264S912000
Reexamination Certificate
active
06319609
ABSTRACT:
TECHNICAL FIELD
This invention relates to a method for producing sound absorbing, vibration-damping and/or heat/cold insulating units of rubber waste from for example tyres, which units are usable among others as noise protections along roads and railways or as insulating plates in buildings.
PRIOR ART
It is known to press together or mould rubber waste to a porous material which can be used for sound absorption or insulation. See SE-A-9603951-6. The present invention relates to a development of this idea and involves a new method for producing units of decomposed rubber waste from for example tyres.
BRIEF DESCRIPTION OF THE INVENTION
Thus, the invention relates to a method for producing sound absorbing, vibration-damping and/or heat/cold insulating units of rubber waste from for example tyres. The invention is characterised in that the rubber waste is decomposed to a desired degree and thereafter mixed with a binder, after which the mixture is formed to said units and is solidified. The binding agent has to be of the type such that the units are elastic even after the solidification.
As the binding agent, a bicomponent glue can be used, which is non-rigid or “soft” even after cold hardening. The binding agent should not be dangerous for the users. A bicomponent polyurethane glue with a hardener is an example of a suitable binding agent.
The units produced according to the present invention can, for example, be used as noise protecting walls along roads, vibration dampers on roads or as insulating units in buildings. The units according to the present invention are very advantageous since they are easily formed in the desired dimensions and shapes, even in situ, and since they are modified and machined and moved easily after the solidification.
At present, excavated material, wood or concrete are preferably used as noise protection materials along roads and railways. An essential advantage when using the units according to the invention is that a considerably better sound insulation is obtained than by screens of concrete or wood. Sound measurements have indicated that the only comparable material, as far as the sound absorption power is concerned, is plastic foams or mineral wool, but these are not suitable materials outdoors used as noise protecting screens. A special advantage of the units according to the invention applied as noise protecting screens is, that they absorb the sound and don't just reflect it.
The units are very cheap to produce as well. In comparison with extensive constructions when building up embankments, the costs can be reduced substantially, at the same time as a more effective result is obtained.
When the units are used as noise protecting screens, another advantage is that they can be produced in situ, for example by using a usual concrete mixer, moulds and a lorry with a mobile crane. A special big crane to place the units is not required.
Another advantage of the invention is the arrangements of the holders of the units, which are labour-saving, material saving and which can be adapted in different ways.
A further advantage of the units according to the invention, for example when they are used as noise protecting screens, is that they are easily removable or replaceable. The base of the noise protecting screens is removable, or there are drilled holes in the ground which need not be removed. The environment of the road can be reestablished in a simple way in comparison with the extensive excavation required in the case of constructed embankments.
An additional advantage of the units is that they are produced of waste which harms the environment, the units according to the invention taking care of such materials contributing towards a better environment.
REFERENCES:
patent: 5094905 (1992-03-01), Murray
patent: 5106554 (1992-04-01), Drews
patent: 5316708 (1994-05-01), Drews
patent: 5439735 (1995-08-01), Jamison
patent: 5800754 (1998-09-01), Woods
patent: 6017472 (2000-01-01), Mack et al.
Eriksson Berndt
Geewe Berne
Bacon & Thomas PLLC
Theisen Mary Lynn
Zeta Innovation HB
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