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Screen Printing Knowledge-Part-1 Screen Stencil

Especially if the 【ink is added with hardener】, we should check the screen stencil carefully if the screen has been cleaned completely.

 

Screen Printing Knowledge-Part-1 Screen Stencil

  • First of all, we’d like to introduce the dos and don’ts for cleaning a screen stencil. 

  • Before cleaning the screen stencil, the ink on the screen must be scraped off.

  • Press the button to let the squeegee move left to scrape off the ink on the graphics.

  • If the squeegee is soft and there is still residual ink after scraping, a harder squeegee can be used to scrape off the ink manually.

  • Do we only have to wipe the bottom of screen with a cloth? Does the top need to be wiped?

    • Of course, wiping both top and bottom sides of the screen is the best and cleanest way to clean.

 Notice: 

  • Be careful when cleaning the screen stencil!(If we need to clean the screen stencil during printing).

    • Be gentle while cleaning the screen stencil.

    • Wet the cloth to the point where the solvent can be wrung out easily.

    • Do not use a cloth that is not wet enough to wipe the screen back and forth quickly.

    • Then wipe gently to prevent the thickness of graphics emulsion from thinning due to rubbing.

  • How do we confirm that the screen stencil is clean?

    • Use a magnifying glass to check if there is ink residue.

  • What if the graphics are too large to be checked one by one?

    • First, we need to use a clean cloth with cleaner or thinner slow.

    • The ink will block the screen mesh if it is not cleaned completely.

    • If the cloth becomes dirty, replace it with a new one.

  • Repeated wiping. Until the cloth is not stained with ink.

  • Do we have to use the cleaner to clean the screen stencil?

    • The cleaner has a very high volatility, which is convenient for rapid volatilization after cleaning.

    • If hardener is added in the ink, a thinner slow should be used to clean and remove the ink effect.ively.

    • After wiping, dry the thinner slow completely with a hair dryer under the screen stencil.

    • Use a hair dryer to dry. Then thinner slow solvent does not remain. Residual solvent will make printing 【blurred】

 Notice: 

  • The residual ink is invisible to the naked eye.Use 2.5D vision measuring machine to see

    • Use 2.5D vision measuring machine to see the difference after cleaning.

    • Use 2.5 disambiguation vision measuring machine to see the difference after cleaning.

  • 75x magnification view

    • Enlarged view after wiping with cleaner.

    • Enlarged view after wiping with thinner slow solvent.

  • Thinner slow solvent can dissolve the ink with hardener effectively.

    • Especially if the 【ink is added with hardener】, we should check the screen stencil carefully if the screen has been cleaned completely.

    • Otherwise, the ink will 【block the mesh】.

    • After the hardener 【reaction time is reached, the screen stencil will nt be cleaned completely】!

    • For fine graphic lines, a thoroughly cleaned screen is crucial.