| 摘要 |
PURPOSE: A pipe for a printing roll is provided to maximize the heating surface area of the pipe network by forming protrusions on the inner circumference. CONSTITUTION: A pipe for a printing roll comprises a concave groove(72) and a convex protrusion(74). The concave groove is formed in the outer circumference of the pipe. The convex protrusion is formed in the inner circumference corresponding to the concave groove. The concave groove has the predetermined helical angle according to the longitudinal direction of the outer circumference of the pipe. The concave groove is successively formed into the state separated the constant interval into the spiral shape. |
