Title of Invention	"A REINFORCED DIAPHRAGM ADAPTED FOR USE IN LIQUIFIED PETROLEUM GAS"
Abstract	This invention relates to a process for producing a diaphragm for use in liquified petroleum gas or methane vaporizer of an internal combustion engine comprising: (i) preheating a polyester fabric at a temperature of 50°-70°C for a period of 2-3 hours; (ii) applying a bonding agent to the fabric and then allowing it to dry wherein the bonding agent (4); (iii) applying an elastomer on said fabric by the step of coating or spreading wherein the elastomer (5); (iv) curing the coated fabric as herein described; (v) cutting the fabric to the required size; (vi) shaping the cut fabric to a diaphragm by press moulding; (vii) adhering a paper gasket to the fastening section of the diaphragm; (viii) securing metallic washers in the centre of the shaped diaphragm; (ix) forming holes in said fastening section and cutting outer periphery.

Title of Invention

"A REINFORCED DIAPHRAGM ADAPTED FOR USE IN LIQUIFIED PETROLEUM GAS"

Abstract

This invention relates to a process for producing a diaphragm for use in liquified petroleum gas or methane vaporizer of an internal combustion engine comprising: (i) preheating a polyester fabric at a temperature of 50°-70°C for a period of 2-3 hours; (ii) applying a bonding agent to the fabric and then allowing it to dry wherein the bonding agent (4); (iii) applying an elastomer on said fabric by the step of coating or spreading wherein the elastomer (5); (iv) curing the coated fabric as herein described; (v) cutting the fabric to the required size; (vi) shaping the cut fabric to a diaphragm by press moulding; (vii) adhering a paper gasket to the fastening section of the diaphragm; (viii) securing metallic washers in the centre of the shaped diaphragm; (ix) forming holes in said fastening section and cutting outer periphery.

Full Text	FIELD OF INVENTION This invention relates to a process for producing a diaphragm for use in liquified petroleum gas or methane vaporizer of an internal combustion engine. BACKGROUND OF INVENTION The use of diaphragms in a vaporizer and the process for the preparation thereof is known in the art. The process comprises in terminating the cotton fabric with an elastomer such as acrylic nitrial butaline. The fabric so obtained is then cut and moulded to the required shape and fitted with the fitments like washer and rivets etc. There are disadvantages associated with the prior art. One of the main disadvantage is that the diaphragms for use in liquified petroleum gas or methane vaporizers of internal combustion engines are normally subjected to high pressures and temperatures and also to the freezing temperature and thereby resulting in a rapid wear and tear of the diaphragm. Further due to the presence of such severe conditions. The reinforcement provided with such diaphragms tends to disintegrate or separate from the base substrate. OBJECTS OF THE PRESENT INVENTION An object of this invention is to propose a reinforced diaphragm and to a method of producing said diaphragm for use in liquified petroleum gas or methane vaporizers of internal combustion engines. Another abject of this invention is to propose a method of producing a diaphragm which can withstand the conditions of high temperature and pressure. Still another object of this invention in to propose a method of producing a diaphragm wherein the reinforcement does not severe from the base substrate of said diaphragm. Yet another object of this invention is to propose a method of producing diaphragm wherein the reinforcement does not severe from the base substrate of said diaphragm. Still another object of this invention is to propose a method of producing a diaphragm wherein the diaphragm has the required physical properties. BRIEF DESCRIPTION OF THE INVENTION According to this invention there is provided a process for producing a diaphragm for use in liquified petroleum gas or methane vaporizer of an internal combustion engine comprising: i) preheating a polyester fabric at a temperature of 50°-70°C for a period of 2-3 hours; ii) applying a bonding agent to the fabric and then allowing it to dry characterized in that; iii) applying an elastomer wherein composition as herein described on said fabric by the step of coating or spreading; iv) curing the coated fabric as herein described; v) cutting the fabric to the required size; vi) shaping the cut fabric to a diaphragm by press moulding; vii) adhering a paper gasket to the fastening section of the diaphragm; viii) securing metallic washers in the centre of the shaped diaphragm; ix) forming holes in said fastening section and cutting outer periphery. In accordance with this invention a polyester fabric is heated under stretched conditions at the temperature of 50-700C for a period of 2—3 hours. The fabric after heating is coated with a bonding agent for example isocyanate adhesive mixed with a solvent such as methyl ethyl ketone in the ratio of 1:3— 5 to provide maximum bonding strength to the fabric. The coated fabric with bonding agent is then subjected to the step of air drying in a dust and dirt free atmosphere. A layer of an elastomer consisting of a co-polymer of vinylidene fluoride and hexa fluoro propylene. oxide, carbon black and calcium hydroxide onto the fabric by the step of coating/spreading. The fabric so obtained is then cured and subsequently cut into the pieces of the required size. The cut pieces are then shaped by press moulding in the form of a diaphragm. A paper gasket is then adhered to the fastening section of the diaphragm and then the holes are formed in the fastening section. A reinforced diaphragm for use in a vaporizer used for supplying liquified petroleum gas or methane as a fuel to an internal combustion engine and the process for the preparation thereof according to a preferred embodiment is herein described and illustrated in the accompanying drawings wherein : Fig.1 shows a plan view of the diaphragm Fig.1A shows sectional view of the diaphragm Fig.2 shows plan view of the diaphragm according to an option. Fig.2A shows sectional view of the diaphragm Fig.3 shows plan view of the diaphragm according to another option. Fig.3A shows sectional view of the diaphragm according to another option. Referring to the drawings particularly fig.l and 1A, the diaphragm has a convoluted diaphragm 1 made of reinforced polyester fabric. Oil resistance gasket 2 is provided at the periphery of the diaphragm 1. Washers 3 and 4 are? provided at the upper surface and lower surface of the diaphragm by means of a rivet 5 in the centre of the diaphragm. A metallic spacer is provided at the upper surface, of the upper washer 3. A rubber O-ring 7 (fig.lA) is provided below the metallic spacers 5 in order to stop the leakage of the fuel from the diaphragm. As shown in fig.2 and 2A, the diaphragm is of the same description as described herein above with reference to fig.l and fig.lA. However, the washers 3 and 4 are secured with the diaphragm by means of a rivet 5 directly without providing a spacer. Reference is now made to fig.3 and 3A wherein the diaphragm according to a second option is shown. The construction of the diaphragm is the same as described herein above with reference to fig.l and 1A. However, a magnet holding insert 8 having a magnet 9 secured therewith is provided on the upper surface of the convoluted diaphragm ? and the washer 3 & 4 are not used. In accordance with the process of this invention the polyester fabric is first heated at a temperature of 500C-700C for a period of 2-3 hours. After heating the fabric the bonding agent for example isocyanate adhesive mixed with a solvent such as methyl ethyl ketone in the ratio of is3-5 is applied on to the fabric and on both sides thereof. The coated fabric * thus obtained is subjected to the step of air drying in a dust and dirt free atmosphere. A coating of elastomer comprising 100 parts of copolymer of vinylidene fluoride and hexa fluoro propylene, 10-20 parts magnesium oxide, 3-8 parts carbon black and 3-6 parts calcium hydroxide. 10—25 parts of talcum powder, mixed with each other homogeneously is applied on both the sides of the convoluted diaphragm by the step of coating or spreading. The coated fabric so obtained is then press cured at the temperature of 150—170°C by simple compression moulding for a period of 10—25 minutes. The fabric so obtained is then cut into the pieces of the required size and which is then shaped in the form of a plan flat diaphragm. The plane diaphragm is then post formed to convoluted form, dish form, hat form or flat form by a short heat treatment in a simple mould press of the required shape. A paper gasket is then adhered to the periphery of the diaphragm and then the holes are formed in the fastening section for facilitating the holding of the diaphragm in the, vaporizers. The washers 3 and 4 one are then secured in the centre of the moulded diaphragm by riveting. The elastomer consisting of the ingredients in the ratio as mentioned herein is seasoned for 2—3 days and then again processed in a mixing mill so that. the constituents are finely dispersed/homogeneously mixed with each other. A solvent methyl ethyl ketone/methy1 isoprnpyl butyl ketone is added to the elastomeric compound in the ratio of 1:1.5-3 to facilitate the application of the elastomer on to the fabric by the step of spreading or coating with the help of doctors knife and drying quickly by warming the spreading table to a temperature above than 45°C and less than 60°C. The coats are provided on both the sides repeatedly to obtain the required thickness of 0.19 to 0.35 mm of the fabric. The shapes of the diaphragm as shown in the drawings are given to illustrated the construction of the diaphragm. However, the invention is not limited to these shapes. The shape of the diaphragm can be made as per the requirement of the vaporizers used in different kind of engines. I CLAIM; 1. A process for producing a diaphragm for use in liquified petroleum gas or methane vaporizer of an internal combustion engine comprising: i) preheating a polyester fabric at a temperature of 50°-70°C for a period of 2-3 hours; ii) applying a bonding agent to the fabric and then allowing it to dry characterized in that; iii) applying an elastomer with composition as herein described on said fabric by the step of coating or spreading; iv) curing the coated fabric as herein described; v) cutting the fabric to the required size; vi) shaping the cut fabric to a diaphragm by press moulding; vii) adhering a paper gasket to the fastening section of the diaphragm; viii) securing metallic washers in the centre of the shaped diaphragm; ix) forming holes in said fastening section and cutting outer periphery. 2. A process as claimed in claim 1 wherein the bonding agent and elastomer are applied on the fabric by the step of coating or spreading on both the sides thereof repeatedly to obtain the thickness of 0.19 ti 0.35 mm of the fabric 3. A process as claimed in claim 1 wherein the step of drying is carried at a temperature above than 45°C and less than 60°. 4. A process as claimed in claim 1, wherein said elastomer in step (iii) is seasoned for 2-3 days and then again processed in the mixing mill so that the ingredients are finely dispersed/homogeneously mixed with each other. 5. A process as claimed in claim 4, wherein a solvent methyl ethyl ketone/methyl isorpopyl butyl ketone is added to the elastomer compound in the ratio of 1:1.5-3 in order to facilitate the coating/spreading of the compound onto the fabric. 6. A process as claimed in claim 1, wherein said fabric is press cured at a temperature of 150-170°C by a simple compression moulding for 10-25 minutes. 7. A process for producing a diaphragm for use in liquified petroleum gas or methane vaporizer of an internal combustion engine substantially as herein described and illustrated.

Full Text

FIELD OF INVENTION
This invention relates to a process for producing a diaphragm for use in liquified petroleum gas or methane vaporizer of an internal combustion engine.
BACKGROUND OF INVENTION
The use of diaphragms in a vaporizer and the process for the preparation thereof is known in the art. The process comprises in terminating the cotton fabric with an elastomer such as acrylic nitrial butaline. The fabric so obtained is then cut and moulded to the required shape and fitted with the fitments like washer and rivets etc. There are disadvantages associated with the prior art.
One of the main disadvantage is that the diaphragms for use in liquified petroleum gas or methane vaporizers of internal combustion engines are normally subjected to high pressures and temperatures and also to the freezing temperature and thereby resulting in a rapid wear and tear of the diaphragm. Further due to the presence of such severe conditions. The reinforcement provided with such diaphragms tends to disintegrate or separate from the base substrate.
OBJECTS OF THE PRESENT INVENTION
An object of this invention is to propose a reinforced diaphragm and to a method of producing said diaphragm for use in liquified petroleum gas or methane vaporizers of internal combustion engines.
Another abject of this invention is to propose a method of producing a diaphragm which can withstand the conditions of high temperature and pressure.
Still another object of this invention in to propose a method of producing a diaphragm wherein the reinforcement does not severe from the base substrate of said diaphragm.
Yet another object of this invention is to propose a method of producing diaphragm wherein the reinforcement does not severe from the base substrate of said diaphragm.
Still another object of this invention is to propose a method of producing a diaphragm wherein the diaphragm has the required physical properties.
BRIEF DESCRIPTION OF THE INVENTION
According to this invention there is provided a process for producing a diaphragm for use in liquified petroleum gas or methane vaporizer of an internal combustion engine comprising:
i) preheating a polyester fabric at a temperature of 50°-70°C for a period of 2-3 hours;
ii) applying a bonding agent to the fabric and then allowing it to dry characterized in that;
iii) applying an elastomer wherein composition as herein described on said fabric by the step of coating or
spreading;
iv) curing the coated fabric as herein described;
v) cutting the fabric to the required size;
vi) shaping the cut fabric to a diaphragm by press moulding;
vii) adhering a paper gasket to the fastening section of the diaphragm;
viii) securing metallic washers in the centre of the shaped diaphragm;
ix) forming holes in said fastening section and cutting outer periphery.
In accordance with this invention a polyester
fabric is heated under stretched conditions at the temperature of 50-700C for a period of 2—3 hours. The
fabric after heating is coated with a bonding agent for example isocyanate adhesive mixed with a solvent such as
methyl ethyl ketone in the ratio of 1:3— 5 to provide maximum bonding strength to the fabric. The coated
fabric with bonding agent is then subjected to the step of air drying in a dust and dirt free atmosphere. A
layer of an elastomer consisting of a co-polymer of vinylidene fluoride and hexa fluoro propylene.
oxide, carbon black and calcium hydroxide onto the
fabric by the step of coating/spreading. The fabric so
obtained is then cured and subsequently cut into the
pieces of the required size. The cut pieces are then
shaped by press moulding in the form of a diaphragm. A

paper gasket is then adhered to the fastening

section of the diaphragm and then the holes are formed

in the fastening section.
A reinforced diaphragm for use in a vaporizer
used for supplying liquified petroleum gas or methane
as a fuel to an internal combustion engine and the
process for the preparation thereof according to a preferred embodiment is herein described and illustrated in the accompanying drawings wherein :
Fig.1 shows a plan view of the diaphragm Fig.1A shows sectional view of the diaphragm
Fig.2 shows plan view of the diaphragm according to an
option. Fig.2A shows sectional view of the diaphragm
Fig.3 shows plan view of the diaphragm according to
another option.
Fig.3A shows sectional view of the diaphragm according to another option.
Referring to the drawings particularly fig.l
and 1A, the diaphragm has a convoluted diaphragm 1 made of reinforced polyester fabric. Oil resistance gasket 2
is provided at the periphery of the diaphragm 1. Washers 3 and 4 are? provided at the upper surface and
lower surface of the diaphragm by means of a rivet 5 in the centre of the diaphragm. A metallic spacer is
provided at the upper surface, of the upper washer 3. A rubber O-ring 7 (fig.lA) is provided below the metallic
spacers 5 in order to stop the leakage of the fuel from the diaphragm.
As shown in fig.2 and 2A, the diaphragm is of
the same description as described herein above with reference to fig.l and fig.lA. However, the washers 3
and 4 are secured with the diaphragm by means of a rivet 5 directly without providing a spacer.
Reference is now made to fig.3 and 3A wherein
the diaphragm according to a second option is shown.
The construction of the diaphragm is the same as
described herein above with reference to fig.l and 1A.
However, a magnet holding insert 8 having a magnet 9
secured therewith is provided on the upper surface of
the convoluted diaphragm ? and the washer 3 & 4 are not
used.
In accordance with the process of this invention the polyester fabric is first heated at a temperature of 500C-700C for a period of 2-3 hours. After heating the fabric the bonding agent for example isocyanate adhesive mixed with a solvent such as methyl ethyl ketone in the ratio of is3-5 is applied on to the fabric and on both sides thereof. The coated fabric
*
thus obtained is subjected to the step of air drying in a dust and dirt free atmosphere. A coating of elastomer
comprising 100 parts of copolymer of vinylidene fluoride and hexa fluoro propylene, 10-20 parts magnesium oxide,
3-8 parts carbon black and 3-6 parts calcium hydroxide.

10—25 parts of talcum powder, mixed with each other homogeneously is applied on both the sides of the
convoluted diaphragm by the step of coating or spreading. The coated fabric so obtained is then press
cured at the temperature of 150—170°C by simple compression moulding for a period of 10—25 minutes. The
fabric so obtained is then cut into the pieces of the required size and which is then shaped in the form of a
plan flat diaphragm. The plane diaphragm is then post formed to convoluted form, dish form, hat form or flat
form by a short heat treatment in a simple mould press of the required shape. A paper gasket is then adhered
to the periphery of the diaphragm and then the holes are formed in the fastening section for facilitating the
holding of the diaphragm in the, vaporizers. The washers 3 and 4 one are then secured in the centre of the
moulded diaphragm by riveting.
The elastomer consisting of the ingredients
in the ratio as mentioned herein is seasoned for 2—3 days and then again processed in a mixing mill so that.
the constituents are finely dispersed/homogeneously mixed with each other. A solvent methyl ethyl
ketone/methy1 isoprnpyl butyl ketone is added to the
elastomeric compound in the ratio of 1:1.5-3 to
facilitate the application of the elastomer on to the
fabric by the step of spreading or coating with the help
of doctors knife and drying quickly by warming the
spreading table to a temperature above than 45°C and
less than 60°C. The coats are provided on both the
sides repeatedly to obtain the required thickness of
0.19 to 0.35 mm of the fabric.
The shapes of the diaphragm as shown in the
drawings are given to illustrated the construction of
the diaphragm. However, the invention is not limited to
these shapes. The shape of the diaphragm can be made
as per the requirement of the vaporizers used in
different kind of engines.

I CLAIM;
1. A process for producing a diaphragm for use in liquified petroleum gas or methane vaporizer of an internal combustion engine comprising:
i) preheating a polyester fabric at a temperature of 50°-70°C for a period of 2-3 hours;
ii) applying a bonding agent to the fabric and then allowing it to dry characterized in that;
iii) applying an elastomer with composition as herein described on said fabric by the step of coating or spreading;
iv) curing the coated fabric as herein described;
v) cutting the fabric to the required size;
vi) shaping the cut fabric to a diaphragm by press moulding;
vii) adhering a paper gasket to the fastening section of the diaphragm;
viii) securing metallic washers in the centre of the shaped diaphragm;
ix) forming holes in said fastening section and cutting outer periphery.
2. A process as claimed in claim 1 wherein the bonding agent and elastomer are applied on the fabric by the step of coating or spreading on both the sides thereof repeatedly to obtain the thickness of 0.19 ti 0.35 mm of the fabric
3. A process as claimed in claim 1 wherein the step of drying is carried at a temperature above than 45°C and less than 60°.
4. A process as claimed in claim 1, wherein said elastomer in step (iii) is seasoned for 2-3 days and then again processed in the mixing mill so that the ingredients are finely dispersed/homogeneously mixed with each other.
5. A process as claimed in claim 4, wherein a solvent methyl ethyl ketone/methyl isorpopyl butyl ketone is added to the elastomer compound in the ratio of 1:1.5-3 in order to facilitate the coating/spreading of the compound onto the fabric.
6. A process as claimed in claim 1, wherein said fabric is press cured at a temperature of 150-170°C by a simple compression moulding for 10-25 minutes.
7. A process for producing a diaphragm for use in liquified petroleum gas or methane vaporizer of an internal combustion engine substantially as herein described and illustrated.

Documents:

3277-del-1998-abstract.pdf

3277-del-1998-claims.pdf

3277-del-1998-correspondence-others.pdf

3277-del-1998-correspondence-po.pdf

3277-del-1998-description (complete).pdf

3277-del-1998-drawings.pdf

3277-del-1998-form-19.pdf

3277-del-1998-form-2.pdf

3277-del-1998-form-3.pdf

3277-del-1998-form-4.pdf

3277-del-1998-form-5.pdf

3277-del-1998-gpa.pdf

3277-del-1998-petition-others.pdf

abstract.jpg

« Previous Patent

Next Patent »

Patent Number

214681

Indian Patent Application Number

3277/DEL/1998

PG Journal Number

09/2008

Publication Date

29-Feb-2008

Grant Date

14-Feb-2008

Date of Filing

05-Nov-1998

Name of Patentee

BIMAL MANCHANDA

Applicant Address

C-83, SECTOR-2, NOIDA, DIST. GAUTAM BUDH NAGAR, UTAR PRADESH.

Inventors:

#	Inventor's Name	Inventor's Address
1	BIMAL MANCHANDA	C-83, SECTOR-2, NOIDA, DIST. GAUTAM BUDH NAGAR, UTAR PRADESH.

PCT International Classification Number

C16 K31/26

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA