Pre-treatment liquid for use in preparation of an offset printing plate using direct inkjet CTP

This invention describes a special liquid applied to an aluminum printing plate before it's printed using an inkjet. The liquid, which contains a metal salt and a swelling agent, prepares the plate's surface so that the inkjet ink sticks properly without clumping. This allows the entire image to be printed in a single pass. The claims specify the liquid must contain either an inorganic acid or a polyvalent metallic salt, along with a swelling agent like N-methyl pyrrolidone or an organic ester.

Why it matters: Filed before modern inkjet CTP systems were widely adopted, the 25 years since 2001 have seen significant advancements in inkjet printhead and ink chemistry. This could make the original problem of ink clustering and single-pass deposition more critical or solvable with modern materials.

Status: ExpiredProtection ended and was never renewed
How hard to build: ModerateChemical formulation, precise application

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