method and device for handling and decolletage molds by blowing thermoplastic articles

摘要

In apparatus for deflashing thermoplastic articles which includes an edge member for slicing through the flash and guide means for the articles during slicing, there is provided temperature sensing control means upstream of the edge member, a rotating screw and adjacent support bar for delivering the articles to the guide means, a retractable support bar section and reciprocable plunger operable in response to a signal from the temperature sensing control means, and individual deflashed article carrier assemblies linearly moving beneath the edge member. The process involves supplying untrimmed thermoplastic blow molded articles, such as preforms, having in the region of a neck moil and the rest of each preform a cool outer skin at a temperature approaching the surface temperature of the blow mold cavity and an inner wall between the skin temperature and the extrusion temperature, sequentially advancing such untrimmed preforms toward a deflashing station while allowing the thermoplastic in such region to partially equilibrate in temperature through the full wall, sensing the surface temperature in such region upstream of the deflashing station and determining whether it is within a predetermined range with respect to the glass transition temperature of the thermoplastic material, ejecting untrimmed preforms whose surface temperature is outside this range, slicing through the thermoplastic in said region of non-ejected preforms in the deflashing station to remove the moils and then catching them in holders as they fall by gravity after removal of the moils.