First PTR is the roller full form Pneumatic Tyre Roller. This type roller also called roller compactor. The compactor used to Gravel, soil, concrete and asphalt construction roads and foundations. It is also used land filling in agriculture.
Pneumatic tired roller are used for highways, construction of dams and for both fine grained. It is also used for the smoothening of finishing bitumen layer on highways, roads, streets etc.
This type of roller heavy loaded with four to six closely spaced tyres. This are also called rubber tyred roller. It is Provide uniformly pressure overall the width.