Chip-In-Place Chipping Process
The Chipping Process
Chip-in-place normally occurs within 30 to 45 minutes. Usually no action is required to induce chipping. As mentioned in previous sections, certain processes may require chip-in-place to be manually initiated after this time has elapsed. Tapping the cured polymer with the tip of a razor knife is typically sufficient to initiate the chip-in-place process.
After the polymer has fractured, it is recommended that the part be allowed to continue to cool for an additional 30 minutes. Most of the fractured polymer should be easy to remove. It is common for the polymer on the edges of the glass piece to be more difficult to remove. If the part has been masked as in Figure 4, polymer along the perimeter (edge) of the glass sheet is more easily removed using a razor knife. The masking tape will peel away with the cured polymer. For reference, the fractured glass plate in Figure 4 is 8 inches by 11 inches. A polymer coating weight of 0.89 grams/in2 was used in the process.
A Quick Illustrated Overview of the Chip-In-Place Process
Chip-In-Place polymer can be applied onto the glass directly from the bottle or through a dispensing system. Stencils or tape can be used to define chip-in-place areas. A gel viscosity polymer is available to create better edge definition, and also facilitate chip-in-place on curved and vertical surfaces.
After the liquid or gel polymer is applied, it is cured under UV light of moderate or high intensity. Chip-in-place is typically self- initiating, approximately 30-45 minutes after curing. Occasionally, thin polymer coatings or large area chipping may need to be manually initiated after the dwell time. Tapping the cured polymer in various locations with a razor knife will initiate the required fracturing. Thirty minutes after fracturing initiates, the glass can be lightly scraped with a razor knife to loosen any partially attached chips. Care must be taken when handling thin glass sections and large sheets after this process.
Beautifully sculpted glass surfaces can be produced in only a few short hours!