Methods for injection molding and injection blow-molding multi-layer plastic articles, including containers and parisons for forming containers, which comprise providing a plurality of co-injection nozzle means for injecting plastic materials into associated injection cavities to form each article, providing...http://www.google.co.uk/patents/US5523045?utm_source=gb-gplus-sharePatent US5523045 - Methods for injection molding and blow-molding multi-layer plastic articles
