Checking drum (roller) pressure uniformity when attaching functional films (OCA,AG,AR,polarizing plates,etc.) to cover glass and touch panels .
When functional films such as OCA are attached to cover glass ,the film is placed on the adsorption pad of the drum.The drum is then roteted and pressure is applied against the underlying stage,where the functional film is affixed to the cover glass.If the pressure balance during this process is incorrect,air bubbles,winkles,positional displacement and other errors may occure,causing product failure.
Product used: Prescale (Ultra Super Low Pressure LLLW,Extereme Low Pressure 4LW)
Prescale is placed between the cover glass and drum,then pressure is applied under normal condition.The Prescale film is then removed and the colar is evaluted to determine process performance.It is easy to evaluate if the stage and drum are balanced,thus determine the presence of dust or shavings on the drum.
Pressure is unevenly applied.
Pressure balance is even, providing a good result.
Quality loss prevention
Quality problems are easily detectable and output yields is improved.
Time loss prevention
Pressure uniformity can be quickly checked during design and maintenance.
Without using Prescale
When Prescale is not used, attaching results must be evaluated. Adjustments require repeated trial and error to resolve defects. This process will result in material loss and increase design adjustment time.
Pressure distributions are validated during actual use conditions. By checking pressure uniformity in advance, quality improvements and design adjustment time reductions can be achieved.