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Low Cost Automation Tutorial

#144 Low Cost Automation and Quality - 7: Pre-Curing and Quality

Category : Manufacturing technology
January18, 2013

When the subject to be heat treated is an organic thin film with adhesive or thin film printing on vaporization process for diluents which control the viscosity of application or printing materials is placed, and a high temperature treatment process is placed to cause a chemical reaction.

In case of precision adhesive bonding process ・・・Used on LCD display outer peripheral section to minimize non-display area.

  -Controlling the viscosity of the adhesive to make it easily handled by a dispensor.

  -By using pre-curing, viscosity control diluent is vaporized.

  -While the adhesive is soft due to high temperature, pressure is applied.

  -The adhesive is cured while the pressure is being applied.


For printing processes on organic thin film ・・・Used on LCD display insulation membrane or orientation membrane.

  -Diluted with solvents to a viscosity where flexography printing system (photo) can handle.

  -Flexography

  -Diluent is vaporized by pre-curing

  -Pre-cured organic material is heat treated up to reaction temperature.


-By incorporating a heat treatment process that is in accordance with the characteristics of the adhesive for the thin film printing, micron accuracy level for the adhesive coatings, and sub-micron level accuracy level are being realized at production lines. The key point for this is the Pre-curing process.

-Walking beam style transfer devices are often used for pre-curing equipment. The number of the pre-curing stages are determined based on the tact time of the production line.

-The mechanism sections such as work push-up and clamping sections that come in contact with printed objects would have large temperature drops due to heat conduction, and likely to cause film thickness variation defects. Therefore, special attention is needed for the designs on these sections.

-In order to achieve such highly accurate printing film thickness, air flow condition around the printed objects during pre-curing process will need to be stabilized, as well as the environment that affect variations of the printing material characteristics such as temperature and humidity will need to be controlled. Therefore, operations by human hands, in many instances, cannot obtain stable film thickness accuracies.

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