FIELD OF THE INVENTION
The Present invention relates to an improved rubber clad rolls, for cold rolling mills applicable in steel plant. More particularly, the present invention relates to an Improved characterized development in rubber sustainable high temperature with dynamic stress- strain workability, anti-chemical reaetant, resistant to abrasive and fatigue adoptable to clad steel rolls to be engaged in acid pickling and hot water rcinsing plant for manufacturing of continuous galvanized steel sheet.
BACKROUND OF THE INVENTION
Rubberized rolls are extensively used in galvavised sheets production but are associated running problems for a longer period of their limited service lives. Apart from service life failure, the rubber convering in contact with hydro-chloric acid as a pickling solution during workability with hot water in cleaning section used to fail due to
a) Change in surface hardness.
b) Layer seperation within rubber covering
c) Blister formation of rubber clad
d)Waviness, crack formation at the surface of the rubber clad
rolls, e) Cut formation of the rubberized rolls.

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The rolls fail within two weeks since their installation under the said severe production conditions resulting consequently frequent shut-down of the plant and thus hampering production of steel sheet due to replacement of the damaged roils.
To over come the above mentioned practical problem in production line, an emphasize is given to find out a technical solution of the said adversity. The present invention proposes to develop a better rubber compound as a rubber clad of the work rolls to increase the endurance service life of the said roll and controlling optimisingly the operating adverse conditions to the rolls in production line.
OBJECTS OF THE PRESENT INVENTION
It is therefore an object of the -present invention to propose an improved characteristic rubber sustainable high temperature with dynamic stress-strain workability, anti-chemical reactant, resistant to abrasive and fatique adoptable to clad steel rolls to be engaged in cold rolling mills which eliminates the disadvantages of prior Art as stated herein before.
Another object of the present -invention is to propose an improved characteristic rubber sustainable high temperature with dynamic stress-strain workability, anti-chemical reactant, resistant to abrasive and fatique

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adoptable to clad steel rolls engaged in cold rolling mills which increased the endurance service period upto 4 months.
A still another object of the present Invention to propose an improved characteristic rubber sustainable high temperature with dynamic stress-strain workability, anti-chemical reactant, resistant to abrasive and fatique adoptable to clad steel rolls engaged in cold rolling mills which can further Increase service life upto one month after first grinding of the rubberised rolls.
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An yet another object of the present invention is to propose an improved
characteristic rubber sustainable high temperature with dynamic stress-strain workability, anti-chemical reactant, resistant to abrasive and fatique adoptabfe to clad steel rolls engaged in cold rolling mills which prevents the formation of surface crack, groove formation, edge cut, layer seperation, waviness.
A further object of the present invention is to propose an improved characteristic rubber sustainable high temperature with dynamic stress-strain workability, anti-chemical reactant, resistant to abrasive and fatique adoptable to clad steel rolls engaged in cold rolling mills which optimisingiy prevent any change in properties after continuous running. As a result, less breakdown time and reduction in frequency of shut down help in higher productivity,,

The chloroprene based synthetic rubber compound so developed comprising in weight%.
Neoprene W-10Q, Magnesium Oxide-4, stearic acid-1.5, coumarone indene resin-4, octadecyl amine-1, Intermediate superabrasion furnace black (N220)-40, 4020 (N-(l,3 dymethyl butyl) '-N'-phenyl-p- phenylene diamine)-!, vegetable oii-3, Mercapto benzothiazyl disulphide - 1.3, Zincoxide-5, NA-229Ethylene Thiourea-0.7.
The blend of the above compound poured in a hot die-cavity around a cylindrical steel roller previously placed inside the mould box. Due to application of heat form the die, the rubber material melt down and compressed the rubber material by means of a mandrel applied from the top of the mould box for better adhesion of rubber material with the steel roller and for better compactability. After curing of the rubber material inside the die, and fulfilling the complete shape, the rubber cladded roller is taken out.
The rubber claded rollers are affixed in the cold rolling mills for manufacturing of continuous galvanizing steel sheet The rubberized rollers are used for squeezing the acid layer from the surface of steel sheet and also for squeezing the water when it is used in hot water rising plant.

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To avoid practical problem and to maintain the attained properties with minimum change with time at the working conditions prevailing which involve attack by chemicals, higher temperatures dynamic stress-cycle and cutting and abrasive conditions and fatique through
a) Minimising leachable materials as also with least absorption
characteristics which is reflected in lower values of weight change
and volume change in working condition.
b) Proper blend of ageing
c) Cross linking
BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
Fig-1, Shows a schematic view of the rubber clad Roller.
Fig-2, Shows a schematic end view of fig-1
Fig-3, Shows a schematic view for method of cladding of rubber around the
steel roll inside a mould.

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BRIEF DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
As shown in fig 3- A moulding die (2) consisting of two parts (2A, 2B) separated from a middle parting line (3). A steel roller (1) is previously placed in the moulding box (2) and the two parts (2A, 2B) are kept in closed condition.
Improved rubber compounds (4) are poured into the cavity around the steel rollers (1) of the mould box (2). The mould box is also provided plurality of heating elements (5) inserted in the mould box. After pouring the rubber compound, the mould box is allowed to be heated which in turn fuse the rubber compound (4) into semi-liquid condition. During this period, the fused rubber materials are compressed by giving pressure from a mandrel (6) situated on the top of the mould (2) for better compactability of rubber materials and better adherence with the steel rollers. The rubber material is allowed to hold in the mould box to complete chain-reaction and after proper curing the rubber claded rollers are taken out from the mould Box (2) fig-1 shows a complete rubber claded rollers and fig-2 shows a end view of the rubber claded rollers.
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WE CLAIM
An improved rubber clad rolls sustainable to high temperature with dynamic-stress-strain workability, anti-chemical reactant, resistant to abrasive and fatique to be engaged In acid pickling and hot water rinsing plant for manufacturing of continuous galvanized steel sheet comprising.
- an improved rubber compound blend (4) comprising.
Neoprene W 100, Magesium Oxide 4, Stearic Acid 1.5, Coumarone indene resin 4, Octadecyl amine 1, Intermediate Superabrasion Furnace black (N 440) 40, 4020 (N-(l, 3 dimethyl butyl'-N-' phenyl-p-phenylene diamine) 1, Veg Oil 3, Mercapto bensothiazyl disulphide 1.3, Zinc Oxide 5, NA-22 9Ethy!ene Thiourea) 0.7 and
a steel roller (1) having definite shape and size as per specification and
a moulding device to clad rubber (4) on steel roll comprising a mould box (2) provided with heating means (5) and a compressable mandrel (6) workable from the top of the mould box (2).
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2. An improved rubber clad rolls sustainable to high temperature with dynamic-stress-strain workability, anti-chemical reactant, resistant to abrasive and fatique to be engaged in acid pickling and hot water rinsing plant for manufacturing of continuous galvanized steel sheet are substantially described herein with reference to the accompanying drawing.
The synthetic rubber Neoprene is prepared by polymerization of chloroprene.By proper selection of additive in the blend and reaction behavior with the addition of the ageing enhancing ingradient,and bonding ingradients - the modified polymer Neoprene based synthetic rubber is prepared to attain better fatique and wear resistance of the synthetic rubber to be used a cladding rubber on the working rolls.
The chloroprene based synthetic rubber compound so developed comprising in weight%.
Neoprene W-100,Magnesium Oxide-4,stearic acid-1.5,coumarone indene resin-4,octadecyl amine-1,Intermediate superabrasion furnace black (N220)-40,4020(N-(1,3 dymethyl butyl)-'N'-phenyl-p- phenylene diamine)-1, vegetable oil-3,Mercapto benzothiazyl disulphide-1.3,Zincoxide-5,NA-229Ethylene Thiourea-0.7.