Abstract: A web of thermoplastic material and a method and apparatus for manufacture of the web are disclosed with the web having a repeating pattern of alternately thick and thin portions. A molten thermoplastic material is extruded through a duct between a first rotatable driven roll and a circular-cylindrical seat. The first driven roll includes a surface having a pattern of recessed portions. The web is transferred from the first driven roll to a second driven roll having a smooth surface. The temperatures of the first and second rolls may be selectively maintained. The thermoplastic material may be extruded through a plurality of ducts leading to the surface of the first driven roll. Transfer of the web from the first roll to the second may be encouraged by means of a vacuum. Furthermore, complete filling of the recesses of the first driven roll by the thermoplastic material may be encouraged by the use of a vacuum.