Plate Blinding or Wear

Problem:

Plate has been improperly prepared.

Solution:

Review procedures for platemaking process.

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Problem:

Surfactant has contaminated the dampening system.

Solution:

Make sure all parts of the dampening system that come in contact with detergent are thoroughly rinsed before being reinstalled on the press.

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Problem:

Fountain solution is poorly balanced or improperly formulated.

Solution:

Check pH and conductivity of fountain solution. Consult your Sun Chemical representative.

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Problem:

Plate cleaners or scratch removers have not been completely rinsed from the plate.

Solution:

Avoid using excessive amounts of plate cleaner or scratch remover. Rinse plates thoroughly afterwards. Be sure all water, sponges, rags, etc, that come in contact with the plate are clean. Do not let plate cleaners dry on the plate.

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Problem:

Stock is depositing filler, coating or lint on the blanket, affecting plates.

Solution:

Use a more lubricated ink. Review dampening setting. Check pH and conductivity. Discuss alternatives with your paper supplier. Consult your Sun Chemical representative.

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Problem:

Faulty or improperly set ink or dampening rollers are wearing plates.

Solution:

Check rollers for condition and settings.

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Problem:

Ink is not properly formulated.

Solution:

Consult your Sun Chemical representative.

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Problem:

Blanket is overpacked or loose.

Solution:

Check packing or blanket tension. Set to manufacturer’s specifications.

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Problem:

Foreign particles are entering the ink train.

Solution:

Check materials such as paper, ink, and wash-up solution. Check overhead structure for foreign materials that may be dropping onto press.

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Problem:

Vanishing dot occurs in image area due to a non-image area build-up on the plate and blanket surrounding the dot.

Solution:

Use a more lubricated ink. Increase blanket washing interval. Consult your Sun Chemical representative.