Sengo nihon-no sangyo seisaku-to seifu soshiki

A method of cooling a plastic extrusion of small cross sectional area, which method includes the steps of drawing the extrusion along a predetermined path and directing water onto it at least at one position along the path so as not to disturb the lateral stability of the extrusion. The water impinging on the extrusion has a substantial component of velocity in the direction in which the extrusion is being drawn.