An under-cure gremlin might catch you out only once in a while, but when it does, it can be an expensive proposition if not remedied early. What you definitely do not need is to discover a curing problem after the whole order has left the shop. So, the obvious advice is to check for proper curing regularly throughout the run.
If or when the under-cure gremlin does catch you out, here is a reference list of possible causes and solutions:
The dryer temperature is too low. Use a thermo-probe to check the temperature at every point on the journey through the dryer. If it is not reaching cure temperature then turning up the heat is the obvious solution. This is a good test to do at least every morning as a matter of routine.
The dryer temperature is fluctuating. Check for open doors or windows that might be allowing a cold draft to flow through the dryer. This cause has baffled more than a few printers over the years, it can happen in summer when the shop can get very hot and doors or windows are opened to provide some relief, and it can happen in winter if you have cold drafts.
The dryer belt is overloaded. Reduce the number of garments on the belt at one time.—space them out more.
The garments are being placed on the belt improperly. Make sure that each garment is flat on the belt so that its imprinted area is fully exposed to the heating elements.
There is excessive moisture in the garments. Run the garments through the dryer before printing them. A forced-air dryer is best for this.
Ink additives have been used improperly. Make sure that ink additives (type and quantity) are used strictly according to guidelines.
The prints have been over-flashed. Over-flashing can adversely affect inter-layer adhesion thereby causing the layers to peel or flake.
Hopefully the under-cure gremlin doesn’t ever sneak up on you, but if it does, these suggestions could save you a lot of stress and money.