Title of Invention	AN ASBESTOS FREE SEALANT AND A PROCESS FOR PREPARATION OF AN ASBESTOS FREE SEALANT MATERIAL FOR USE AS SEALANT AT JOINTS IN FUEL INJECTION PUMPS-WET METHOD
Abstract	ABSTRACT The invention in general relates to Asbestos free Sealant material which is economic and eco-friendly used in for fuel Injection Pump to enhance the sealing effects in ail critical joints, withstand severe working conditions and possess vibration resistance, temperature shock, adequate compression strength, fuel resistance etc. The controlled process of preparation comprises of two steps namely Beater (Wet-Process) and Calendring process. The end product sealant is a combination of materials like NR+NBR latex as a binder, inorganic salts as fillers, Curing agent, activator, activator accelerator, binders, and Coagulant agent. In the Beater Process all selected ingredients in required quantity is subjected alongwith slurry to continuous mixing and churning until desired fineness, pH level is achieved. The water is then drained such that a wet sheet is formed which is pressed to obtain uniformly thick sheet, which is then further subjected to partial curing in the hot air oven at a particular temperature range for a particular duration. In Calendering process, the partially cured sheets Is further subjected to final curing at elevated temperature to obtain uniform thickness and surface smoothness.

Title of Invention

AN ASBESTOS FREE SEALANT AND A PROCESS FOR PREPARATION OF AN ASBESTOS FREE SEALANT MATERIAL FOR USE AS SEALANT AT JOINTS IN FUEL INJECTION PUMPS-WET METHOD

Abstract

ABSTRACT The invention in general relates to Asbestos free Sealant material which is economic and eco-friendly used in for fuel Injection Pump to enhance the sealing effects in ail critical joints, withstand severe working conditions and possess vibration resistance, temperature shock, adequate compression strength, fuel resistance etc. The controlled process of preparation comprises of two steps namely Beater (Wet-Process) and Calendring process. The end product sealant is a combination of materials like NR+NBR latex as a binder, inorganic salts as fillers, Curing agent, activator, activator accelerator, binders, and Coagulant agent. In the Beater Process all selected ingredients in required quantity is subjected alongwith slurry to continuous mixing and churning until desired fineness, pH level is achieved. The water is then drained such that a wet sheet is formed which is pressed to obtain uniformly thick sheet, which is then further subjected to partial curing in the hot air oven at a particular temperature range for a particular duration. In Calendering process, the partially cured sheets Is further subjected to final curing at elevated temperature to obtain uniform thickness and surface smoothness.

Full Text	Complete specification Title : " Asbestos free Sealant for Fuel Injection pump - Wet method " Background of the invention This invention relates to Asbestos free sealant material suitable for the use of fuel injection pumps, to enhance the sealing effects in all critical joints. Description of the related art Currently in fuel injection pumps, Asbestos sealants are being used to seal the critical joints. The sealing agent is expected to hold the lubricating oil inside the pump and possess adequate compression strength, high and low temperature resistance and temperature shock, controlled swelling behaviour in oil, vibration resistance, fuel resistance etc., Object of the Invention The object of this invention is to provide a new sealant, wherein use of Asbestos is eliminated and to make it environment friendly. It is another object of the invention to arrive at an end product whose quality Is better than currently available. Today's fuel injection technology demands that the sealant should withstand severe working conditions and equally resistant to chemically aggressive fuels. It is another object of the invention in the context of present trend In the International arena towards elimination of Asbestos in sealant preparation, to prepare Asbestos free sealant. According to the invention, the enhanced quality of the sealant originates from the composition and also from the controlled process which has been developed by the inventors. Summary of the Invention According to the invention, the sealant sheet Is formed by Beater(Wet- process) and Calendering process. During the process, the necessary ingredients are added in required quantity and sequence while maintaining the process parameters to the specified values, in order to achieve the desired physical, mechanical and functional properties like, - single layer pressed with smooth, uniform surface finish - does not leave any burrs or break during further processing - have adequate strength to handle the component - ability to withstand low and high temperature changes (extreme working conditions from-40DCto+150DC) - perform as a perfect sealant so that thin fluids like cSesei fuel does not leak at high pressure working conditions - good oil absorption with torque retaining property Describtion of the invention The sealant, according to invention carried out for resciving the aforementioned disadvanntages, Involves the said process comprising of a. Beater (Wet process) b. Calendering process The material selected in the process is a combination of NR+NBR latex as a binder to heat resistant synthetic fiber, which together form the matrix „of the sealant. The fillers are selected for their properties imparting desired level of density, flexibility, heat resistance and amenability to process as a suspension in a beater process. The product comprises of the following; synthetic pulp Inorganic salts as fillers Curing agent Actlvator Activator accelerator Binders Coagulating Agent The sheets are made as a specialty product on the required/desired properties of the end product. In the formulation, the selection of the synthetic pulp as a better replacement for Asbestos Is based on the following; it" should form a uniform aqueous suspension on beating Minimum duration for better fabrillation Required sheet strength Uniform fiber orientation along and across of the formed sheet As a product it should meet high temperature resistance properties PAdequate flexibility to withstand high pressure load The sealant, according to the invention carried out for resolving the aforementioned disadvantages, involves 8 steps; Step1: Beating of the pulp In this process, the dilute slurry of the pulp are separated into fine fibers and dispersed by mechanical action using a special beater machine. The dispersed fibers are then shortened to the required fineness measured in terms of Canadian Standard Freeness ( CSF ). The beater action continues till established value CSF 200 Is achieved. Step 2 : Mixing of pulp The pulp so prepared is then transferred to mixing machine where it is continuously churned while the necessary fillers, polymers, curing agents, accelerator etc., are added In required quantity and sequence as per the formula developed for obtaining desired properties. 2.1 Curing agent - Sulphur 50%wtA/vt 2.2 Accelerators - Zinc Diethyl Ditho carbonate 50% wtA/vt - Tetra methyl thioram Disulphide 50% wbwt 2.3 Activator 50%wtAwt Zinc oxide acts as an accelerator activator and also as reinforcing agent fa latex 2.4 Fillers Desired level of inorganic salts to enhance stiffness and strength for" easy to handleu 2.5 Alkali hydroxide maintain alkalinity pH 8-9 to prevent coagulation when binder (latex ) is added 2.6 Binder Water soluble latex of NR- NBR to hdd together the pulp and filler Measuring accuracy 0.001mm Measuring period 300 seconds No. of measurement 10 Record of measurement Thickness change every 30 seconds Important functional properties achieved - Pressure Tightness : The material developed has shown excellent Pressure tightness property as a sealant of fuel Injection pump at the critical joints upto a pressure of 1.5 bar under adverse assembly conditions. - Torque properties : The specified ratio cf initial tightening torque to further tightening torque is minimum 0.45. The material developed has always exhibited a ratio higher than 0.7 In all trials with different and severe test conditions. - Temperature resistance : The material possesses good temperature resistance between - 40DC and + 140DC without affecting the pressure tightness. - Vibration resistance : The material developed is able to function without any leakage under conditions of vibration specified for fuel ijection pump coupled with elevated temperature upto 100DC Illustration of the Invention Figure 1 illustrates the sequential processes involved In the Invention. We claim: - 1. An Asbestos free sealant material suitable for use of the fuel Injection purrp.- 2 A process for the preparation of an Asbestos free sealant material, wherein said process comprises the following major steps: a. Beater (Wet proces) b. Calendering process X A process as claimed in claim 2, for preparation of Asbestos free material ' ' suitable for the use of fuel injection pump, wherein Beater (Wet process), comprising the steps of: a. subjecting all the desired ingredients with slurry. In desired quantity, to_ mixing and churning and continuing until desired fineness is achieved. I b. continuing the step 3 ( a) until the desired pH level is achieved. c. optimisation of the draining process, wherein the water is drained and a wet sheet Is formed. d. optimisation of pressing process, wherein uniformly thick sheet is obtained. e. subjecting the said sheet to partial curing by keeping the said sheet in the hot air oven at a specified temperature range for a specified duration. A process as claimed in Claim 2 for the preparation of Asbestos free sealant material suitable for use of fuel Injection pump, wherein Calendering process comprising the steps of: a. subjecting the partially cured sheets in step3(e) to Calendering in a Calendering machine undej specified conditions.^ b. subjecting the Calendered sheets to final curing process at elevated temperature so as to obtain surface smoothness and Improved density. 5. A process as claimed in Clause 2 and 3, wherein the step 3(a), the desired fineness means a value of 200 CSF (Canadian Standard Freeness) 6. A process as claimed in Clause 2 and 3, wherein the step 3(a), the desired ingredient means fillers, polymers, additives, antioxidants and the desired quantity means :- " " ' —— ■ Temperature resistance: Good temperature resistance between - 40°C and + 140°C without affecting the pressure tightness. vibration resistance : The material developed Is able to function without any leakage under conditions of vibration specified for fuel injection pump coupled with elevated temperature upto 100°C

Full Text

Complete specification
Title : " Asbestos free Sealant for Fuel Injection pump - Wet method "
Background of the invention
This invention relates to Asbestos free sealant material suitable for the use of fuel injection pumps, to enhance the sealing effects in all critical joints.
Description of the related art
Currently in fuel injection pumps, Asbestos sealants are being used to seal the critical joints.
The sealing agent is expected to hold the lubricating oil inside the pump and possess adequate compression strength, high and low temperature resistance and temperature shock, controlled swelling behaviour in oil, vibration resistance, fuel resistance etc.,
Object of the Invention
The object of this invention is to provide a new sealant, wherein use of Asbestos is eliminated and to make it environment friendly.
It is another object of the invention to arrive at an end product whose quality Is better than currently available. Today's fuel injection technology demands that the sealant should withstand severe working conditions and equally resistant to chemically aggressive fuels.
It is another object of the invention in the context of present trend In the International arena towards elimination of Asbestos in sealant preparation, to prepare Asbestos free sealant.
According to the invention, the enhanced quality of the sealant originates from the composition and also from the controlled process which has been developed by the inventors.
Summary of the Invention
According to the invention, the sealant sheet Is formed by Beater(Wet- process) and Calendering process. During the process, the necessary ingredients are added in required quantity and sequence while maintaining the process parameters to the specified values, in order to achieve the desired physical, mechanical and functional properties like,
- single layer pressed with smooth, uniform surface finish
- does not leave any burrs or break during further processing

- have adequate strength to handle the component
- ability to withstand low and high temperature changes
(extreme working conditions from-40DCto+150DC)
- perform as a perfect sealant so that thin fluids like cSesei fuel does not leak at high pressure working conditions
- good oil absorption with torque retaining property
Describtion of the invention
The sealant, according to invention carried out for resciving the aforementioned disadvanntages, Involves the said process comprising of
a. Beater (Wet process)
b. Calendering process
The material selected in the process is a combination of NR+NBR latex as a binder to heat resistant synthetic fiber, which together form the matrix „of the sealant. The fillers are selected for their properties imparting desired level of density, flexibility, heat resistance and amenability to process as a suspension in a beater process. The product comprises of the following;
synthetic pulp
Inorganic salts as fillers
Curing agent
Actlvator
Activator accelerator
Binders
Coagulating Agent
The sheets are made as a specialty product on the required/desired properties of the end product.
In the formulation, the selection of the synthetic pulp as a better replacement for Asbestos Is based on the following;

it" should form a uniform aqueous suspension on beating
Minimum duration for better fabrillation
Required sheet strength
Uniform fiber orientation along and across of the formed sheet
As a product it should meet high temperature resistance properties
PAdequate flexibility to withstand high pressure load
The sealant, according to the invention carried out for resolving the aforementioned disadvantages, involves 8 steps;
Step1: Beating of the pulp
In this process, the dilute slurry of the pulp are separated into fine fibers and dispersed by mechanical action using a special beater machine. The dispersed fibers are then shortened to the required fineness measured in terms of Canadian Standard Freeness ( CSF ). The beater action continues till established value CSF 200 Is achieved.
Step 2 : Mixing of pulp
The pulp so prepared is then transferred to mixing machine where it is continuously churned while the necessary fillers, polymers, curing agents, accelerator etc., are added In required quantity and sequence as per the formula developed for obtaining desired properties.
2.1 Curing agent - Sulphur 50%wtA/vt
2.2 Accelerators - Zinc Diethyl Ditho carbonate 50% wtA/vt
- Tetra methyl thioram Disulphide 50% wbwt
2.3 Activator 50%wtAwt Zinc oxide acts as an accelerator
activator and also as reinforcing agent fa latex
2.4 Fillers Desired level of inorganic salts to enhance
stiffness and strength for" easy to handleu
2.5 Alkali hydroxide maintain alkalinity pH 8-9 to prevent
coagulation when binder (latex ) is added
2.6 Binder Water soluble latex of NR- NBR to hdd
together the pulp and filler

Measuring accuracy 0.001mm
Measuring period 300 seconds
No. of measurement 10
Record of measurement Thickness change every
30 seconds
Important functional properties achieved
- Pressure Tightness : The material developed has shown excellent
Pressure tightness property as a sealant of fuel Injection pump at the critical joints upto a pressure of 1.5 bar under adverse assembly conditions.
- Torque properties : The specified ratio cf initial tightening torque
to further tightening torque is minimum 0.45. The material developed has always exhibited a ratio higher than 0.7 In all trials with different and severe test conditions.
- Temperature resistance : The material possesses good temperature
resistance between
- 40DC and + 140DC without affecting the pressure tightness.
- Vibration resistance : The material developed is able to function without any
leakage under conditions of vibration specified for fuel ijection pump coupled with elevated temperature upto 100DC
Illustration of the Invention
Figure 1 illustrates the sequential processes involved In the Invention.

We claim: -
1. An Asbestos free sealant material suitable for use of the fuel Injection purrp.-
2 A process for the preparation of an Asbestos free sealant material, wherein said process
comprises the following major steps:
a. Beater (Wet proces)
b. Calendering process
X A process as claimed in claim 2, for preparation of Asbestos free material ' ' suitable for the use of fuel injection pump, wherein Beater (Wet process), comprising the steps of:
a. subjecting all the desired ingredients with slurry. In desired quantity, to_ mixing and churning and continuing until desired fineness is achieved.
I b. continuing the step 3 ( a) until the desired pH level is achieved.
c. optimisation of the draining process, wherein the water is drained and
a wet sheet Is formed.
d. optimisation of pressing process, wherein uniformly thick sheet is obtained.
e. subjecting the said sheet to partial curing by keeping the said sheet in the
hot air oven at a specified temperature range for a specified duration.
A process as claimed in Claim 2 for the preparation of Asbestos free sealant material suitable for use of fuel Injection pump, wherein Calendering process comprising the steps of:
a. subjecting the partially cured sheets in step3(e) to Calendering in a
Calendering machine undej specified conditions.^
b. subjecting the Calendered sheets to final curing process at elevated
temperature so as to obtain surface smoothness and Improved density.
5. A process as claimed in Clause 2 and 3, wherein the step 3(a), the desired fineness means a value of 200 CSF (Canadian Standard Freeness)
6. A process as claimed in Clause 2 and 3, wherein the step 3(a), the desired ingredient means fillers, polymers, additives, antioxidants and the desired quantity means :- " " ' —— ■

Temperature resistance: Good temperature resistance between - 40°C and
+ 140°C without affecting the pressure tightness.
vibration resistance : The material developed Is able to function without
any leakage under conditions of vibration specified for fuel injection pump coupled with elevated temperature upto 100°C

Documents:

1072-mas-1999 abstract.pdf

1072-mas-1999 drawings.pdf

1072-mas-1999 abstract duplicate.pdf

1072-mas-1999 claims duplicate.pdf

1072-mas-1999 claims.pdf

1072-mas-1999 correspondence -others.pdf

1072-mas-1999 correspondence -po.pdf

1072-mas-1999 description (complete) duplicate.pdf

1072-mas-1999 description (complete).pdf

1072-mas-1999 drawings duplicate.pdf

1072-mas-1999 form-1.pdf

1072-mas-1999 form-19.pdf

1072-mas-1999 form-26.pdf

1072-mas-1999 form-5.pdf

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Patent Number

220383

Indian Patent Application Number

1072/MAS/1999

PG Journal Number

30/2008

Publication Date

25-Jul-2008

Grant Date

28-May-2008

Date of Filing

05-Nov-1999

Name of Patentee

MOTOR INDUSTRIES COMPANY LIMITED

Applicant Address

Inventors:

#	Inventor's Name	Inventor's Address
1	VISHWANATH VISHNU HEDGE
2	KAYICKODATHU RAMACHANDRAN

PCT International Classification Number

F 16 J 15/10

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA