I have a tumble dryer which works perfectly fine for drying clothes. But, sometimes when drying duvets or blankets (all stuff where the label says it can be tumbled) it burns the fabric. It can be as little as a few small brown scorch marks to full on singeing the fabric - makes it all crusty and brittle.
The dryer is probably about 10 years old but it normally works fine. We don't even use it on a high heat setting - just stick it on for x-amount of time and it can ruin things.
Any ideas why or what I can do to stop it happening? A new duvet is now damaged!