Slow sealant curing is a frequent fault in insulating glass production lines, which seriously delays production efficiency and affects sealing quality and durability. In most cases, this problem is caused by two main reasons, both of which are simple and quick to troubleshoot.

1. The first reason is incompatible sealant mixing. Mixing different brands or types of sealants (such as newly added primary sealant mixed with residual secondary sealant) will cause the extruded sealant to turn dark black and fail to cure normally.

Solution: Flush and clean the glue extruder thoroughly with professional solvent strictly in accordance with the manufacturer’s instructions, and always use matching and compatible sealants.

2. The more common cause is insufficient proportion of black curing agent sealant. Equipment parameter drift, such as inaccurate calibration of pressure cylinder, will reduce the mixing ratio of black sealant, resulting in slow curing or complete non-curing.

Solution: Recalibrate and adjust the pressure cylinder to increase the proportion of black sealant, then test the tack-free time, which shall meet the standard of 4–6 hours as required.

Accurately identifying the above two root causes enables rapid maintenance, keeps the insulating glass sealing line running efficiently, and ensures stable, tight and long-lasting sealing performance.

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