Design requirements of a molded plastic Dustbin Mould occasionally do not allow the dustbin to be removed directly from the plastic dustbin mold as it opens. This is true when the plastic dustbin is undercut with respect to the line of travel or of the opening and closing of the mold. The usual practice is to modify the design as much as possible in order to make the simplest mold.

waste bin mouldThe loose-bar type of injection dustbin mold is a useful design for overcoming the difficulty of ejecting a long draw, thin section dustbin. The sliding box cover shown in Fig.1. is a typical example of a dustbin which cannot readily be ejected directly on account of the long draw, 4 inches, and the thin section, .040 inch. Endwise molding which is required for direct ejection on opening the press is impractical with these characteristics. This is because the action of the ejector mechanism depends on the amount of opening travel. Also, the mold would be rather bulky—at least twice the length of the dustbin to allow space for the dustbin and for the ejector travel. By molding over a core attached to a loose bar, it will be possible to mold lettering on the top face of the box, as it will be drawn directly from the cavity as the mold opens. The loose-bar mold for the box cover is shown in Fig. 1. A side view and a view facing the ejection end platen are shown. The bar is to be removed manually and replaced by a duplicate bar so the dustbins may be stripped on a bench while the second bar is in the mold. No ejector device is required. The mold is simple, and consists of front and rear adaptor plates, cavity blocks and retainer, loose bar and core assembly, guide pins and retainer plate and the gating system.

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