| 摘要 |
<p>The present invention relates to an improved method and apparatus for injection molding and cooling molded articles, such as preforms, so as to avoid crystallinity. The apparatus and method make use of a take-off plate for removing articles (48) from a mold, which plate may include heat transfer devices for cooling exterior surfaces if the molded articles or preforms (48), and a system for cooling (74) in a controlled manner the interior surfaces of the molded article or preforms (48). Following removal of a molded article from the mold into a take-off holder (62), cooling pins are inserted into molded articles, which cooling pins (74, 174) focus a stream of gaseous cooling fluid on a relatively hot internal surface of the molded article; this can be seen in FIG. 9(a). The cooling pin forms an open system with the preform to allow the gaseous cooling fluid to escape into an ambient environment. The cooling pin (74, 174) may be shaped, for example to include external ribs (86, 88), to achieve various cooling effects. <IMAGE></p> |
