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The offset blanket

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Function of blanket

To transfer ink to the paper surface andconsequently much of the character of the

printed image is a result of the blanket

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Structure of blanket

The blanket consists of backing fabricmade of cotton plies or manmade fibers,

which are woven and laminated in thinlayers and then coated in a syntheticrubber or similar compound to give asmooth surface and overall even caliper.

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Trend of blanket

More compressible

More complex internal structure than the

older conventional ones.

Improved rolling characteristics and betterdot definition

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The surface of the blanket

There is incorporating layer of very small air orgas bubbles in the structure of the blanket toenabling the surface to deform without causing it

to be stretched and create defects.

Made by synthetic rubber such as nitrile withblends of polysulphide rubber to improve sheetrelease properties.

Also added with plasticizer, sulphur, zinc oxide,fillers which toughen and harden, and pigmentsto give the required color.

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The variety of blanket

There is various blanket which designed tosuit with material or inks

Conventional ink

UV-cured inks

Heat-set inks

Solvent-based inks Varnishes

Lacquer

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Blanket categorization

Soft blanket

Medium blanket

Hard blanket

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Soft blanket

70 - 74 degrees Shores hardness

Suitable for uncoated paper

Large solids printing jobs

Polyurethane material

Low speed machines

Proofing process Suitable for metal printing

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Medium blanket

74 76 degrees Shore hardness

The normal blanket suited to a wide range

of paper (coated and uncoated paper)

Suitable for metal printing

Suitable to print on the plastic sheets

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Hard blanket

76 82 degrees Shore hardness

Used on high speed presses e.g.

newspaper and web-offset

Coated paper

Suitable to print on the foil and plastic

materials