| 摘要 |
<p>U>S 34,328 An improvement in the apparatus and process of producing extruded resinsiding, for example polyvinyl chloride, in which there is an extruded siding passed through a cooling and sizing section wherein the improvement is in the provision of notches or cut out portions along the edge of the upper plate-like former surface and the direction of cooling air onto the edge and immediately adjacent areas of the siding and formers, some of the air being directed at close proximity to control what areas are cooled and to obtain higher cooling efficiency on the desired areas, with the result being a higher temperature drop on the siding through the apparatus as improved but with a greater temperature drop on the hanger and butt edges of the siding than on the panel which is observed to have provided improvements of (1) increased line rate, (2) reduced off specification product and (3) improved heat properties.</p> |
