Clean the lint filter before or after every load.

A dirty lint trap reduces air flow and leads to blockages in the dryer duct. It is like cholesterol in your dryer.

Clean or replace your dryer duct at least twice a year
A clean duct:
 - shortens drying time
 - puts less stress on your dryer extending its life expectancy
 - most importantly, protects your family and home from fire

Replace plastic vinyl hose with rigid or flexible metal duct.
Vinyl hose tends to trap lint and will not contain a fire in the event one occurs. Deflecto has excellent replacement products for your plastic and vinyl duct.

http://www.deflectoventilation.com/en/products.html?fid=137766&proTypeName=Dryer%20Ducts