Maintenance & Service Manual IMPRESSIONS
Contents
1. SR CHEMICAL EXCELLENT 24 HYDROBHROMIC ACID SOLN 10 50 25 HYDROCYANIC ACID 26 HYDROFLUOSILICIC ACID 27 HYDROGEN SULPHIDE 28 ISOAMYL ACETATE 29 ISOPROPYL ACETATE 30 LACTIC ACID 31 OLEIC ACID 32 BENZALDEHYDE 33 BENZENE 34 BENZYL BENZOATE 35 BENZYL CHLORIDE 36 BI SULPHIDE WASHING LIQUOR 37 BROMO BENZENE 38 BUTADIENE 39 BUTANE 40 BUTYL CELLOSOLVE 4 BUTYL MERCAPTAN 42 BUTYL STEARATE 43 CALCIUM BI SULPHATE 44 CALCIUM CARBONATE 45 CALCIUM CHLORIDE 46 CALCIUM HYDRO OXIDE 47 CALCIUM HYPOCHLORITE 48 CALCIUM SALTS 49 CARBITOL 50 CARBON DISULPHITE 51 CARBON TETRA CHLORIDE 52 CELLOSOLVE ETHYL GLYCOL 53 CHLORINATED SOLVENTS 54 CHLORINE 50 AT 20 C 55 CHLORIDE OF NICKEL 56 CHLOROBENZENE 57 CHOLOROFORM 58 CHLORO NAPHTHALENE 59 CHLORO NITRO ETHANE 60 CHLORO PHENOL 61 CHLORO TOLUENE 62 CIRCO LIGHT PROCESS OIL 1 TEXTILE PRINTING BLANKETS SR CHEMICAL EXCELLENT GOOD FAIR POOR 63 COAL GAS 64 COAL TAR 65 COLD FORMALDEHYDE 66 COLD SODIUM HYDROCHLORIDE 67 COLD CARBON DI OXIDE 68 COLD WATER 25 C 69 COLOUR ANILINE 702. 107 FERRIC CHLORIDE 108 FERROUS SULPHATES 109 FERROUS CHLORIDES FLUID HYDRAULIC OILS FLUORENE 12 FLUOROBENZENE GLYCERINE GLYCOL 115 HIGH AROMATIC CONTENT OILS 116 HOT CARBON DI OXIDE 117 HOT HYDROCHLORIC ACID 37 118 HOT CARBON MONOXID 119 HUMID CHLORINE 120 HYDROGEN PEROXIDE 80 85 121 HYDROGEN SULPHIDE 122 ISOOCTANE 123 ISOPROPYL CHLORIDE 124 KAOLIN 125 KAOLIN SILICATE 126 KEROSENE 127 LACQUERS SOLVENTS 128 LIME 129 LOW AROMATIC CONTENT OILS 130 MAGNESIUM MAGNESIUM CHLORIDE 132 MAGNESIUM HYDROXIDE 133 MAGNESIUM SALTS 134 METHYL CHLORIDE 135 METHYL SALICYLATE 136 METHYLENE CHLORIDE 37 NORMAL HEXANE 138 OXIDE ETHERS 39 OZON 140 PARAFFIN TEXTILE PRINTING BLANKETS 13 SR CHEMICAL EXCELLENT GOOD FAIR POOR 41 142 PARAFFIN OIL PETROLEUM 143 PER CHLORO ETHYLENE 144 PHENOL 145 PHENYL 146 PHENYL 147 PHOSPHOROUS CHLORIDE 148 PHOSPHOROUS TRI CHL
3. COPPER SULPHAT 71 CRESOLS CRESYLIC AIR 72 CRUDE PETROLEUM 73 CUMENE 74 CHLORID 75 CYCLO HEXANE 76 CYCLO HEXANOL 77 CYCLO HEXANONE 78 DECA HYDO NAPHTHALINE 79 DIBUTYL ETHER 80 DIBUTYL PHTHALAT 8 DICHLORO BENZENE 82 DICHLORO ETHANE 83 DICHLORO ETHYLENE 84 DICHLORO PHENYL BENZENE 85 DIETHYL AMINE 86 DIETHYL ETHER 87 DEISOMETHYLANILINE 88 DI ISOPROPYL ACETONE 89 DIMETHYL ANILINE XYLIDIENE 90 DIOCTYLPHTHALAT 91 DI OXANE DI ETHYL OXIDE 92 DIPENTENE 93 DI PHENYL BENZENE 94 PHENYL BENZENE 95 DI PHENYL OXIDE 96 FUEL OIL 97 ETHANOL 98 ETHANOLAMINE 99 ETHYL BENZENE 100 ETHYL BUTAN ETHYL PENTA CHLORO NZENE 2 TEXTILE PRINTING BLANKETS SR CHEMICAL EXCELLENT GOOD FAIR POOR 102 ETHYL PHENYL PENTA CHLORO BENZENE 103 ETHYL SILICATE 104 ETHYLENE CHLORIDE 105 ETHYLENE GLYCOL 106 ETHYLENE OXIDE
4. Maintenance 6 Service Manual IMPRESSIONS TEXTILE PRINTING BLANKETS U Mahalaxmi Rubtech Limited 507 Chanakya Near Dinesh Hall Ashram Road Ahmedabad 380 009 INDIA Tel 91 79 6582552 6585864 Fax 91 79 6583552 2138725 E mail mrt icenet net Website www mrtglobal com CONTENTS NECESSARV PRECAUTIONS FOR STORING THE BLANKET 02 NECESSARV PRECAUTIONS FOR FITTING OF THE BLANKET 02 PREVENTIVE ACTION AGAINST DAMAGING THE BLANKET DUE TO MISHANDLING 04 NECESSARV PRECAUTIONS TO BE FOLLOWED IN CASE OF A STOPPAGE OF THE MACHINE 06 NECESSARV PRECAUTIONS FOR CLEANING THE PERMANENT ADHESIVE WITH A SOLVENT 07 NECESSARV PRECAUTIONS FOR CLEANING THE SURFACE OF THE NEW BLANKET 08 RESISTANCE OF THE BLANKETS TO THE CHEMICALS 09 IMPRESSIONS O fo TEXTILE PRINTING BLANKETS The Impressions range of lextile Printing Blankets manufactured bv Mahalaxmi Rubtech Limited are products of high value prepared by a precision combination of selected materials of high quality and processing technology of high level taking the uniformitv of elongation strength and thickness and resistance of chemicals solvents and abrasion in to consideration This manual contains all necessarv precautions to be exercised for prolongation of the service life of this expensive blanket while maintaining its excellent properties Each user of the blanket is expected to understand the contents of this manual thoroughly for the right use of
5. OXID 190 ETHYL ALCOHOL 191 ISOBUTYL ALCOHOL 192 ISOPROPYL ALCOHOL 193 METHYL ALCOHOL 194 ROPYL ALCOHOL 195 STARCH 196 LIPHATIC MINERAL ESSENCE 197 198 LUMUNIUM CHLORIDE LUMINIUM FLUORIDE 199 ESSENCE 200 ASTM I OILS 201 ASTM II OILS 202 SULPHUR 203 SULPHUR DI OXID 204 ERPINOL 205 ERTRA ANILINE 206 OLUENE 207 RANSFORMER OIL 208 209 RIBUTYL PHOSPHATE 210 RICRESYL PHOSPHATE 211 RICHLORO ETHYLENE 212 T a TRIACETYNE RI ETHANOL AMINE 213 WINES AND SPIRITS 214 WHITE SPIRIT OF LOW AROMATIC CONTENT 215 WHITE SPIRIT OF HIGH AROMATIC CONTEN 216 XYLENE 217 ZINC BI CARBONATE 218 ZINC BI SULPHATE 219 ZINC CARBONAT 220 ZINC CHLORIDE The information given here is based on our best knowledge and experience Please read all statements recommendation on suggestion here in conjunction with our conditions of sales We assume no responsibility for the use of these statements recommendations or suggestions
6. blanket NECESSARV PRECAUTIONS FOR STORINGTHE BLANKET The Impressions range of Textile Printing Blankets are manufactured and delivered endless They are rolled up with great care on solid tubes of cardboard and packed in a wooden case To prevent any unnecessary damage during transit and storing they are protected with sheets of foam bubble wrap plastic sheet jute cloth and other necessary packing materials When a blanket is reguired to be stored for long durations please adhere to the following instructions carefully Upon the arrival of the wooden case containing the blanket make sure it is in good conditionand the blanket withinit lies flat atthe bottom of the case Further ensure that no nails broken parts or any other kind of devices have damaged the blanket due to improper handling during the transit 2 It is advisable not to store the blanket for more than one year 3 The box must be stored in cool and dry place where it is not exposed to steam pipes or direct sunlight or violent temperature variations Make sure that the wooden case lies flat to ensure that the blanket sits on the larger base 4 The blanket needs certain amount of maturing and stabilization and hence should not be used immediately after manufacture We strongly recommend to leave the blanket unused for at least one month to impart proper seasoning NECESSARY PRECAUTIONS FOR FITTING OF THE BLANKET The fitting operation requires utmost care
7. other accessories and parts that would possibly damage the blanket at the time of installation should be taken off the machine Special precaution should be taken to check the inside of the machine for sharp metal pieces or foreign substances and then spread a piece of thick cloth over it All the projecting points bolt heads frames rollers etc must be wrapped up with a tape or cloth 8 After installation on the machine the blanket should rotate idle on the machine for a minimum of 4 5 days non stop for thoroughly stabilizing the blanket During this period the tracking of the blanket should be balanced perfectly by adjusting the rollers and the guides For stabilizing the blanket initially the tension should be increased very gradually and even on both sides simultaneously We recommend the tightening of the blanketby5mmonly each time and the same process should be repeated till the blanket is stabilized TEXTILE PRINTING BLANKETS 10 04 the blanket is made to run and is stabilized both the edges of the blanketare to be trimmed off while letting the blanket run Please note that the blanket sometimes requires minor additional trimming after it has run under tension following the installation on a printing machine Visual press lines we call Press Mark which are un avoidable found approximatelv in one meter distance on the surface of the blanket and round folds formed on the blanket resulting fro
8. time of mountingof the blanket formationof crease and folds mustbe avoided This mav cause permanentdamage to the carcass fabric and the cracking of the rubber Once such a crease or fold is formed on the surface of the blanket it would not be smothered out even under high tension and pressure Hence it must be strictly observed not to bend the blanket less than the diameter of the cardboard tube 5 A label with an arrow sign is printed on the blanket which would be clearly visible once the blanket is unrolled Make sure the blanket is aN installed on the machineis such a wayso that it runsin the direction of the arrow when the machine is in operation 6 For mounting the blanket on the machine the take up roller is shifted IMPRESSIONS WM RT forward Check carefully that both the ends of the roller are shifted equally so that the roller will strictly make a right angel with both frames of the machine The imbalanced fixation of the roller will give an uneven tension to the blanket This will result in malfunctioning and deformation of the blanket Take care all the other rollers doctor blade etc are in good condition and are properly adjusted to be parallel to each other and make a rightangel with the frames of the machine Further ensure that all the bearing ofthe machine main rollers and guide rollers are checked thoroughly 7 Allthe demountable devices i e devices for washing sizing and sticking the fabric guide rollers and
9. ORIDE 49 150 POTASSIUM BI CARBONATE POTTASIUM CARBONAT 52 POTTASIUM CHLORIDE 153 PURE BROMINE 154 REFINED PETROLEUM 155 SATURATED POTASH 156 SEA WATER 157 SILICATE OF SO DA 158 SOAPS SOLUTION 59 SODA 3 160 SODA 10 16 SODA 2096 162 SODA 50 163 SODIUM BI CARBONATE 164 SODIUM BI SULPHATE 165 SODIUM CARBONATE 166 SODIUM CHLORIDE 167 168 SODIUM PEROXIDE SODIUM PHOSPHATE 169 SODIUM SULPHAT 170 SODIUM SULPHIT 71 SODIUM THIOSULPHATE 172 STEAM WATER 173 STYRENE 174 OXALIC ACID 175 PALMIC ACID 176 177 PHOSPHORIC ACID 10 PHOSPHORIC ACID 7096 178 STEARIC ACID 179 SULPHONIC B ENZENE ACID TEXTILE PRINTING BLANKETS 4 SR CHEMICAL EXCELLENT GOOD FAIR POOR 180 181 RI CHLORO ACETIC ACID 10 182 MMONIA SOLUTION 183 184 MYL NAPHTHALENE 185 NHYDROUS CARBONIC ACID 186 AMYL ALCOHOL B ENZYL ALCOHOL 187 BUTYL ALCOHOL 188 COLD FORMALDEHYDE 189 DRY SULPHURIC Dl
10. and should not be executed too hastily Never forget that it is most important to achieve impeccable fitting rather than save a little time Whatever techniques are employed make sure thatthe ZA below mentioned instructions are carried out with greatest calm and care 27 To take out the blanket of its box it is essential to use suitable handling 1 equipment While taking theblanket out ofthewooden box proper precautions should be taken to ensure that the blanket is not damaged due to nails or broken parts on the edges of the box by using a piece of thick cloth paper and cardboard tube Do not use pointed or sharp instruments such as hooks knifes etc that mav hurt the surface and even tear the blanket c TEXTILE PRINTING BLANKETS 2 Before installing the blanket on the machine check the blanket for anv damage caused to it in transit and also confirm whether its size is in conformitv with the purchase order 3 Spread a thick piece of cloth on the entire printing table or on the tidv even floor After removing the blanket from the box unroll it on the cloth on a table or clean floor to avoid anv contact with hard and foreign substances harmful matters or spilled solvent oil grease etc These mav harm the blanket or get embedded in the top rubber surface of the blanket causing permanent dent damage Make sure to unroll the blanket by handling it with the cardboard tubes on which the blanket is rolled 4 While handling and atthe
11. angle doctor blade flow or taking up roller and the rubber surface of the blanket The rubber surface can be severely damaged when its contact with the machine parts is broken at the time of starting the operation again To prevent such damage a releasing paper must be placed between the blanket and the respective contacting parts or such parts must be kept away from the blanket prior to stopping the machine for a long time TEXTILE PRINTING BLANKETS NECESSARV PRECAUTIONS FOR CLEANING THE PERMANENT ADHESIVE WITH SOLVENT Damages resulting from theunauthorized and careless useof solvents and chemicals are the most dangerous of all damages occurring to the blanket When such damages are found it is generally too late for most of them to be repaired The intensity of these damages varies widely depending on the conditions including the kind concentration and temperature of the solvent the time of contact with the solvent and the method of handling Hence we strongly recommend to always put more emphasis on thesafety of the solventwith respect to the blanket than on the speed of cleaning In order to achieve the maximum and effective life of the blanket users are requested to study the following instructions Aromatic carefully and implement the same very strictly Solvents No aromatic solvents like Ethyl Acetate Butyl Acetate Toluene etc MEK should be used while cleaning the blanket Thinner 2 The rubber surface is res
12. istant to alcohol gasoline etc but using any aggressive solvents like Acetone Methyl Ethyl Ketone MEK Trichloroethylene Thinner etc will affect on the rubber coating Swelling wr is the first sign of the affect Subsequently on prolonged use the surface E will form blisters and result in de lamination ofthe plies of fabric carcass with the rubber These solvents as mentioned above therefore should not be used for leaning the blanket surface and for cleaning the adhesive 3 case printers are obliged to use aromatic solvents which is always detrimental to rubber surface the same should be diluted properly and sufficiently There is less danger if the K B value of diluted solvent is less than 40 but following caution is must while cleaning the blanket a For cleaning the surface of the blanket with a solvent wipe the surface of the blanket with a cloth soaked with a solvent swiftly The residue of solvents must be removed immediately and thoroughly by washing the surface with water Care should be taken to ensure that the time of contact of the solvent with the rubber surface of the blanket is minimum b The appearance of a black stain on the white cloth during the cleaning indicates that the blanket is being attacked by the solvent d Immediately upon such visualization the cleaning operation shou be stopped Be careful not to pour so much solvent as to form a puddle on the blanket surface Be careful
13. l penetrate into the blanket surface causing damage The hardened paste should be softened first with the help of aliphatic solvent or any other authorized chemical product Once the paste is softened then it can be carefully removed with wooden However it is always advisable to wash the blanket periodically with acetic acid 50 concentration The rubber surface is resistant to aliphatic solvents such as gasoline alcohol etc White spirits most widely used as cleaning media for the blankets NECESSARY PRECAUTIONS FOR CLEANING THE SURFACE OF THE NEW BLANKET The surface of anew blanket is covered with a small amount of protective wax which is incorporated in the blanket at the time of its production Give enough time to the cleaning of the blanket by use of non fatty soap and water or neutral detergent these may be mixed with scouring powder and then repeat washing with water A permanent adhesive will not stay onthe surface of the blanket satisfactorily if the washing is not carried out thoroughly 2 lt is undesirable to sand the surface rubber of the blanket with a sandpaper or wipe with a sand paper or wipe with a strong organic solvent so that a permanent adhesive will bond firmly to the blanket If the sanding is required for good bonding please use a fine mesh sandpaper with approximate 200 mesh 3 Sometimes about one month of blanket usage is required for the permanent adhesive to become attached to
14. m the winding on the cardboard tubes are cause of no concern and will not affect the printing qualitv in anv wav These apparent lines round folds or other defects such as the waviness will disappear after certain period of working or bv applving extra little tension Also spot touching marks if observed on the surface of the blanket will not harm or affect the blanket life and qualitv of printing lt is advisable to use woolen lapping instead of cotton lapping on the main cylinder of the printing machine in case of roller printing machine to achieve effective cushioning while printing under tension Before starting the machine check to see thattool and machine partsare all removed from the blanket and that bolts and nuts are fastened tightly PREVENTIVE ACTION AGAINST DAMAGING THE BLANKET DUE TO MISHANDLING When oil grease spills uponthe blanket guickly wipethe spilt oil witha cloth soaked with alcohol or aliphatic solvent Be careful not to use aromatic solvent for removing the oil If oil spills repeatedly or in large quantities especially on the edges or on their reverse sides and is left unclean the strength and stability of the blanket will decrease at the edges and ultimately result in separation of the layers Uneven pressure and improper functioning of advancing clamps and malfunctioning of the blanket guide rollers will damage the face and reverse sides of the edges lead to separation of layers and further damage
15. not to brush the blanket surface if it has been swelled solvent Allowing the rubber surface to swell will lead to its deterioration including loss of strength excessive wear cracking etc Further this would also damage the dimensional and functional accuracv of the whole blanket resulting in uneven running speed vibration and side drifting O IMPRESSIONS TEXTILE PRINTING BLANKETS os d Caution should be used not to allow the solvent to extend to the trimmed sides or evenfurther to the reverseside of the edges If solvent is spilled on the blanket wipe it away with a dry cloth promptly Negligence of such promptaction or repeated misuse of solvents will damage the blanket by gradually separating the layers at the edge e When the blanket is used for a long time with a permanent adhesive applied repeatedly to forma multi layer coating upon its surface the user may be inclined to use a strong and corrosive solvent for a speedy and economical cleaning This should be avoided considering its adverse affect on the blanket It is advisable to shorten the service period of permanent adhesive to promote ease of cleaning and thus prolong the life of the blanket The position of the colouring paste particularly incase of Pigments which does not wash out when the blanket passes through the washing unit should be removed from the blanket surface manually if necessary Otherwise under prolong time span the Pigment wil
16. p rubber surface or on reverse side of the blanket When these parts are caught between the cvlinder and the blanket thev damage the blanket Hence periodicallv inspectthe demountable parts and see thev tightened firmly Precautions must betaken to prevent washingwater from soaking the trimmed edges and the reverse side of the blanket Further note deposits especiallv of drv and hardened dves remaining starch solvent residue etc formed onthe edges of the blanket accelerates the wear of the rubber surface To prevent the formation of such deposits continual cleaning is essential While using hot water for temporary washing of the blanket ensure the temperature of the water is below 40 C If separation between the layers at the edge is left unrepaired it would quickly expand both lengthwise and crosswise and the blanket will disintegrate under the pressure of the starch mangle guide rollers sizing roller and the doctor blade The upper layer may delaminate from the lower layer The separation of the layers should therefore be discovered early and repaired immediately Do not subject the blanket to excessive heating through use of gas burner infrared burner or intermediate dryers The use of hot air higher than 70 C will result into ageing and eventually lead to cracking of the rubber surface The thermal expansion of the rubber and the carcass fabric of the blanket due to excessive heating may disturb the functional ac
17. the blanket Periodically inspect both the front and rear drums washing brushes blanket guide rollers clamps and doctor blade etc carefully for dry and hardened foreign material such as waste thread chemicals dyes starch etc Deposits of this kind should be cleaned immediately or else they would abrade and damage both surfaces of the blanket and finally develop an uneven surface on the blanket When the blanket is in stationery condition running of the washing unit should not be continued otherwise it may cause damage to the blanket Washing equipment or brushes and the blanket must run simultaneously when the machine is in operation TEXTILE PRINTING BLANKETS Sizing rollers starch mangle doctor blade and main rollers should not be imbalanced while in operation resulting in abnormal or too strong pressure on the blanket This imbalanced functioning of the moving mechanical parts often causes damage to the surface rubber laver or the fabric on the reverse side of the blanket and can also separate the lavers at edges of the blanket thus reducing performance accuracv and life of the blanket Ensure that the blanket is properly balanced tracked on the machine or else during the operation the blanket edges will get abraded with the guide rollers guides and collars causing permanent damage Screws of the screen stencil frame and squeegee holders bolts nuts and other removable metal parts often become loose and fall on the to
18. the blanket surface depending upon the kind of permanent adhesive 15 TEXTILE PRINTING BLANKETS RESISTANCE OF THE BLANKET TO THE CHEMICALS The rubber surface of the blanket is constantly in contact with various chemicals and dyestuff Hence it is very important to note the resistance of Synthetic Blended Rubber Surface to the chemicals used for preparing the dyestuff paste and for cleaning the blanket The effective resistance to such chemicals solvents and spirits is specified in the chemical resistance chart CHEMICAL RESISTANCE CHART SR CHEMICAL EXCELLENT GOOD FAIR POOR ACETIC ACID CONC 25 ACETIC ACID CONC 60 ACETIC ACID CONC 80 ACETIC ACID HOT T 80 ACETONE ACETYLENE AMYL ACETATE BENZOIC ACID BUTYL ACETATE CARBONIC ACID CHLOROSULPHONIC ACID 2 CELLOSOLVE ACID 3 CHROMIC ACID 14 CITRIC ACID 15 COLD DILUTED HYDROFLUORIC ACID 16 COLD HYDROCHLORIC ACID 30 17 COLD NITIRC ACID LOW CONCENTRATION 18 FORMIC ACID CONCENTRATION 30 19 FORMIC ACID CONCENTRATION 80 20 FUMING SULPHURIC ACID 21 HOT AIR 96 C 22 HOT CONC HYDROCHLORIC ACID 23 HOT SULPHURIC ACID 75 95 TEXTILE PRINTING BLANKETS
19. tivity of the blanket and cause irregular movement improper tension vibration and side drifting Such disturbances vary depending upon the kind of heat source temperature number of heaters drying time position of the heaters and the speed of machine TEXTILE PRINTING BLANKETS 06 NECESSARV PRECAUTIONS TO FOLLOWED IN CASE A STOPPAGE OF THE MACHINE I The heating equipment should never be left switched on when the machine is not in operation Otherwise this will cause localized shifting of the blanket Before stopping the machine the blanket should run fora little after drver is switched off and cooled down completelv 2 Remove the sizingvat and make sureto clean the sizingdoctor and lift itso that it is no longer in contact with the blanket 3 Thoroughly wash the blanketif it is coated with a soluble adhesive as well as other parts ofthe machine that are smeared with the same adhesive If the machine is to remain unused for a certain time it is essential to wash the blanket at least one hour with the normal washing equipment 4 Completely dry the blanketby stopping the outlets of water and continue to rotate the blanket without any water until it is entirely dry 5 Check the cleanliness of the rollers especially it they are not coated with PVC or Teflon 6 A machine shutdown fora long time may create a tight bond between the adhesive applied tothe surface of theblanket and the sizingroller starch m
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