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...... SAKATA INX SAKATA INX SAKATA INX (INDIA) LTD TECHNICAL TRAINING - OFFSET INKS 08.09.06 & 09.09.06 VENUE : UNITECH - I COUNTRY CLUB, GURGAON TOPIC.

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Presentation on theme: "...... SAKATA INX SAKATA INX SAKATA INX (INDIA) LTD TECHNICAL TRAINING - OFFSET INKS 08.09.06 & 09.09.06 VENUE : UNITECH - I COUNTRY CLUB, GURGAON TOPIC."— Presentation transcript:

1 SAKATA INX SAKATA INX SAKATA INX (INDIA) LTD TECHNICAL TRAINING - OFFSET INKS & VENUE : UNITECH - I COUNTRY CLUB, GURGAON TOPIC Coatings, its applications, advantages & application process. PRESENTER : Mr. Bhupinder Singh CO – PRESENTER :Mr. Rajesh Chauhan. EXPERT :Mr. TAKASHI KIMURA

2 SAKATA INX SAKATA INX Coatings It is a thin protective layer applied to a surface to protect and improve its appearance.

3 SAKATA INX SAKATA INX Need Of Coatings in Printing  Alone ink cannot act as barrier to physical and chemical abrasion.  To provide more sheen or gloss.  To provide better slip properties.  For fast turn around on press.  To provide special effects.  To give advanced packaging solution.  Therefore along with ink, coating are used to give desired final print or pack.

4 SAKATA INX SAKATA INX Coating Characteristics  High gloss or matt finish  Barrier property (vapor/grease)  Scuff resistance  Water and chemical resistance  Heat resistance  Blocking resistance  Seal ability ( Blister Packing)  Deep freeze resistance  Hot foil stamping  Flexibility  Glue ability

5 SAKATA INX SAKATA INX Functions of Coatings Gloss Level  70 % and above – High gloss  55 to 70 % - Gloss  30 to 40 % - Satin or Neutral  Below 20 % - Matte

6 SAKATA INX SAKATA INX Functions of coatings - Scuff, rub and slip properties  COF or coefficient of friction – denotes slip characteristics  Number of rubs with fixed weight  Dry or wet  Temperature and humidity conditions

7 SAKATA INX SAKATA INX Types Of Coatings  Oil Base Varnishes  Aqueous Varnishes  U V Varnishes  Solvent Base Varnishes

8 SAKATA INX SAKATA INX Oil Base Coatings  Litho over print coatings are generally solutions of solid resins in vegetable drying oils.  It is nothing but a colorless ink.  Most economical way for providing gloss and scuff.  Maximum film weight can be applied is as low as 0.8 to 1.5 g.s.m.

9 SAKATA INX SAKATA INX Advantages Disadvantages  Does not offer instant drying and necessary to use spray powder which can cause characteristic rough feel.  Gloss level and scuff resistance is lower in comparison to aqueous and U.V.  Tendency to yellowish ness.  Do have a distinctive odor on dried print  Is the most inexpensive way to add gloss to a printed piece.  Ideal means of “spot” varnishing at high speed.  Greater flexibility in film and creates no problem during folding and creasing.

10 SAKATA INX SAKATA INX Aqueous Coatings  Styrene-acrylic based resin systems  pH between 8.2 to 8.6  Solid contents typically between 40 to 45 %  Viscosity  Tower coating – 35 to 60 seconds  Flexo/Gravure – 30 to 40 seconds  Dampener – 60 seconds  Duct/screen – 30 +/- 10 poise

11 SAKATA INX SAKATA INX Advantages Disadvantages  Instant drying.  No spray powder and cleaner environment.  Generally better than OPV in gloss and scuff.  Dried coating is water white and odor less,suitable for food packaging.  Can be used as primer for UV Coat.  Spot varnish is difficult and possibility is only cutting blanket on non - image areas which is generally done for providing cut-outs for printing packing information on pack.

12 SAKATA INX SAKATA INX U.V. Varnish  Is the blend of acrylates of low molecular weights which when energized by the use of powerful UV light photo-initiators within the coating, crosslink virtually instantaneously to form a dry, solid resin film.  Maximum film weight applied is 3 gsm.

13 SAKATA INX SAKATA INX Advantages Disadvantages  Produce ultimate gloss and film hardness and instant curing.  Good product resistance.  Fast turn around and no spray powder.  Being solvent free, taint problems are reduced although it does have characteristic odor. Higher unit cost.  Lesser film flexibility.  Substrate and dried ink should have sufficient high surface energy to be UV receptive.

14 SAKATA INX SAKATA INX Precaution in doing UV and Aqueous coatings Over lithographic inks  Avoid inks that contain surface lubricants (waxes) and high concentration of distillates (ultra quick setting inks).  Ensure the inks are dry in offline application. Allow at least two days minimum.  Avoid use of final pigments - rhodamine, reflex blue, purple and violet.  In offline application spray powder should be used minimum or coated powders.

15 SAKATA INX SAKATA INX Drying Process  Conventional or oil based  Water based  UV Coating  Absorption and Oxidation  Absorption and evaporation  Photo-Polymerization

16 SAKATA INX SAKATA INX Application Methods  Roller coating  Off-line  In-line  Ink duct  Dampener system  Flexo  Gravure  Screen

17 SAKATA INX SAKATA INX Reference Chart Of Coatings

18 SAKATA INX SAKATA INX Thank You


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