The present invention relates to non magnetic asphalt based structure
borne vibration dampener ,mainly steel sheet vibration more particularly the
present invention relates to reduce specific gravity of non magnetic asphalt
based structure borne vibration dampener ,mainly steel sheet vibration.
Here in after referred as SD Pad as vibration dampener for mainly but
not limited to used in automobiles for dampening of automobile body sheet
metal and other similar location vibration dampener. More precisely used in Car
body shell locations such as but not limited to Floor Panel, Wheel House Panel,
Fire Wall Inner Panel, Door Inner Panel, Roof Panel, Trunk Panel etc.
For many years asphalt based vibration dampener , also globally known
as Melt Sheet / Sound Deadener Pad/Asphalt Sheet / Antivibration Pad ,IFF , is
considered as an important material for vehicle body shell (,sheet metal)
vibration dampener and is extensively used in automobiles but not limited to,
for dampening of sheet metal vibration.
Present available conventional materials in the industry have a Specific Gravity
between 1.3 to 2 , for non magnetic type material . A major disadvantage of
such conventional SD Pad observed is that ,due to higher Specific Gravity
specifically 1.6 to 1.8 , increases the weight input per car, and weight reduction
is a major challenge for automakers particularly for passenger car segment in
order to reduce overall vehicle weight to enhance the fuel efficiency.
These problems are over come by present invention of light weight SD
Pad here in after called as PSDL0.IX8 of Specific Gravity 0.91 to 1.10.
PSDL0.IX8 is so designed that it can be used in similar condition as present
conventional SD Pads are used by automobile industry. PSDL0.IX8 is custom

designed profile cut flat sheet of thickness range 1.5mm to 8 mm more
specifically 1.5mm to 6 mm as per the need of users, are placed on the relevant
sheet metal at an ambient temperature and there after subjected to a fusing ,(
thermal bonding) temperature , of 140°C to 220 °C more specifically 140°C to
170°C for a period of 15 to 45 min , typically 20 to 30 minutes and naturally
cooled to ambient temperature . Thus fused PSDL0.IX8 forms an unconstrained
dampening layer to the sheet metal and acts a vibration dampener.
The main features of this invention is PSDL0.IX8 is having the following
properties:
a) Light weight.
b) Similar acoustical property as that of conventional asphalt based SD Pads
c) Processable in conventional application process as present in industry
d) Profiled to required shape and sizes and thickness
e) Can be coated with external adhesive for use in vertical or over hang
application
f) Recyclable and Reusable
In the art non magnetic asphalt based structure borne vibration dampener
,mainly steel sheet vibration
are known e,g, WIPO Patent Application WO/2005/115736 provides process for
coating modified bitumen membranes using reflective laminate coatings
wherein a method of coating a modified bitumen roll roofing membrane inplant
comprising the steps of: (a) applying a layer of a reflective laminate upon a
surface of a modified bitumen roll roofing membrane exiting from a formation
line; (b) permitting said reflective laminate to heat activate; and (c) allowing the
laminate to cure and adhere to said surface is disclosed.

However, these known non magnetic asphalt based structure borne
vibration dampener has cetain disadvantages which are discussed herein below.
For many years asphalt based vibration dampener, also globally known as Melt
Sheet / Sound Deadener Pad/Asphalt Sheet / Antivibration Pad ,IFF , is
considered as an important material for vehicle body shell (,sheet metal)
vibration dampener and is extensively used in automobiles but not limited to,
for dampening of sheet metal vibration.
Present available conventional materials in the industry have a Specific Gravity
between 1.3 to 2 , for non magnetic type material . A major disadvantage of
such conventional SD Pad observed is that ,due to higher Specific Gravity
specifically 1.6 to 1.8 , increases the weight input per car, and weight reduction
is a major challenge for automakers particularly for passenger car segment in
order to reduce overall vehicle weight to enhance the fuel efficiency.
These problems are over come by present invention of light weight SD
Pad here in after called as PSDL0.IX8 of Specific Gravity 0.91 to 1.10.
PSDL0.IX8 is so designed that it can be used in similar condition as present
conventional SD Pads are used by automobile industry. PSDL0.IX8 is custom
designed profile cut flat sheet of thickness range 1.5mm to 8 mm more
specifically 1.5mm to 6 mm as per the need of users, are placed on the relevant
sheet metal at an ambient temperature and there after subjected to a fusing ,(
thermal bonding) temperature , of 140°C to 220 °C more specifically 140°C to
170oC for a period of 15 to 45 min , typically 20 to 30 minutes and naturally
cooled to ambient temperature . Thus fused PSDL0.IX8 forms an unconstrained
dampening layer to the sheet metal and acts a vibration dampener.

Thus the object of present invention is to provide Non magnetic asphalt
based structure borne vibration dampener ,mainly steel sheet vibration non
magnetic asphalt which overcomes above disadvantages and furthermore has
following additional features:-
The main features of this invention is PSDL0.IX8 is having the following
properties :
g) Light weight.
h) Similar acoustical property as that of conventional asphalt based SD Pads
i) Processable in conventional application process as present in industry
j) Profiled to required shape and sizes and thickness
k) Can be coated with external adhesive for use in vertical or over hang
application
l) Recyclable and Reusable
According to the present invention there is provided non magnetic asphalt
based structure borne vibration dampener ,mainly steel sheet vibration wherein
PSDL0.IX8 is prepared from
(i) commercially available materials namely ashpalt (commercially known as
Bitumen), mineral filler such as but not limited to Slate Stone Powder,Glass
Bead ,Calicium Carbonate , polymeric materials such as but not limited to
EVA,LDPE,SBR,NR, fibrous material such as but not limited to cellulose fiber,
synthetic or cotton fiber, requisite processing additives are mixed together at a
high temperature 110°C to 230 °C and sheeted out to desired thickness;
which,are

(ii) mixed in the ratio of materials in %are , asphalt 15% to 55%, filler 25% to
78% ,polymeric material .01 to 8 %, fibrous material 0.2% to 13, additives 05%
to 3%;
(iii) after homogenous mixing under controlled temperature and time the
compound thus formed are rolled out to sheet of desired thickness;
(iv) wherein the obtained sheets are further processed to provide desired profile
shape in trimming process which further may be processed but not compulsory
for adhesive application as per the end product usage requirements.
Further Non magnetic asphalt based structure borne vibration dampener
,mainly steel sheet vibration as claimed in claim 1, wherein the PSDL0.IX8 is
light weight vibration dampener for structure borne vibration to steel aluminium
sheet metal structure which can be cut to shape profile of thickness 1.5 to 8 mm
prefereably 1.5 to 6 mm.
Still further Non magnetic asphalt based structure borne vibration
dampener ,mainly steel sheet vibration as claimed in claim 1, wherein the
obtained material can be used for passenger car, heavy commercial vehicle, bus,
off road vehicle, farm equipment, body structure, sheet metal vibration
dampener and the like.
Yet Non magnetic asphalt based structure borne vibration dampener
,mainly steel sheet vibration as claimed in any of claims 1 to 3 wherein an
extremely useful for use in automobile as light weight vibration dampener for
automotive industry to meet the challenging job of over all vehicle weight
reduction.

WE CLAIM:

1. Non magnetic asphalt based structure borne vibration dampener ,mainly
steel sheet vibration wherein PSDL0.IX8 is prepared from
(i) commercially available materials namely ashpalt (commercially known as
Bitumen), mineral filler such as but not limited to Slate Stone Powder,Glass
Bead ,Calicium Carbonate , polymeric materials such as but not limited to
EVA,LDPE,SBR,NR, fibrous material such as but not limited to cellulose fiber,
synthetic or cotton fiber, requisite processing additives are mixed together at a
high temperature 110°C to 230 °C and sheeted out to desired thickness;
which,are
(ii) mixed in the ratio of materials in %are , asphalt 15% to 55%, filler 25% to
78% ,polymeric material .01 to 8 %, fibrous material 0.2% to 13, additives 05%)
to 3%;
(iii) after homogenous mixing under controlled temperature and time the
compound thus formed are rolled out to sheet of desired thickness;
(iv) wherein the obtained sheets are further processed to provide desired profile
shape in trimming process which further may be processed but not compulsory
for adhesive application as per the end product usage requirements.
2. Non magnetic asphalt based structure borne vibration dampener ,mainly
steel sheet vibration as claimed in claim 1, wherein the PSDL0.IX8 is light
weight vibration dampener for structure borne vibration to steel aluminium
sheet metal structure which can be cut to shape profile of thickness 1.5 to 8 mm
typically 1.5 to 6 mm.
3. Non magnetic asphalt based structure borne vibration dampener ,mainly
steel sheet vibration as claimed in claim 1, wherein the obtained material can be
used for passenger car, heavy commercial vehicle, bus, off road vehicle, farm
equipment, body structure, sheet metal vibration dampener and the like.
4. Non magnetic asphalt based structure borne vibration dampener ,mainly
steel sheet vibration as claimed in any of claims 1 to 3 wherein an extremely
useful for use in automobile as light weight vibration dampener for automotive
industry to meet the challenging job of over all vehicle weight.

Non magnetic asphalt based structure borne vibration dampener ,mainly
steel sheet vibration wherein PSDL0.IX8 is prepared from (i) commercially
available materials namely ashpalt (commercially known as Bitumen), mineral
filler such as but not limited to Slate Stone Powder,Glass Bead ,Calicium
Carbonate , polymeric materials such as but not limited to EVA,LDPE,SBR,NR,
fibrous material such as but not limited to cellulose fiber , synthetic or cotton
fiber , requisite processing additives are mixed together at a high temperature
110°C to 230 °C together at a high temperature 110°C to 230 °C and sheeted
out to desired thickness; which,are (ii) mixed in the ratio of materials in %are ,
asphalt 15% to 55%, filler 25% to 78% ,polymeric material .01 to 8 %, fibrous
material 0.2% to 13, additives 05% to 3%; (iii) after homogenous mixing under
controlled temperature and time the compound thus formed are rolled out to
sheet of desired thickness; (iv) wherein the obtained sheets are further
processed to provide desired profile shape in trimming process which further
may be processed but not compulsory for adhesive application as per the end
product usage requirements.