The roller is a tool for rolling a thread, and is composed of an ou♏ter sleeve rolleꦇr, an inner sleeve roller, a flange, a transition sleeve, and a roller shaft. When rolling the thread, a single roll, a double roll or a triple roll can be used.

It consists of an outer casing roller, an inner sleeve roller, a flange, a transition sleeve and a roller shaft. An interlayer is formed between the outer sleeve roll and the inner sleeve roll, the roll shaft being hollow, wherein the empty passage communicates with the interlayer. The invention solves the problems of slow cooling rate, poor cooling effect and easy separation of the rubber layer on the roller surface from the metal surface in the prior art, and is an ideal equipment suitable for use in the production process of PVC plastic sheets.