Abstract: A lid-container assembly made of synthetic plastic material suitable for the transportation and storage of hazardous materials in conformity to the UN standard. The container includes a bottom and a substantially cylindrical or cone trunk side wall having an upper edge that bounds an access opening. The container is provided with a first external annular strip provided with a first circular rib and with at least one second circular rib for snap fitting of the lid. The lid includes a central part and a peripheral wall that conforms to the side wall of the container and further includes a second external annular strip that releasably engages the corresponding external annular strip of the container. The second external annular strip has an upper annular element that connects to the peripheral wall by an upturned U-shaped upper annular channel, and includes a lower annular element inserted into a lower annular channel in the form of an upwards pointing U, and an intermediate annular element for tear opening.

Abstract: It is described a method and an apparatus for injection co-mould and assemble plastic material objects having a first part provided with a hinge pin, and a second part provided with an annular element suitable to be coupled in an articulated manner. The apparatus includes a mould having separated moulding impressions for the two parts to be moulded; a first moulding pin element defining the pin impression and a second moulding pin element defining the annular element impression are provided. The apparatus includes cooling means; particularly the first pin element is internally provided with a channel and a tubular element, being coaxially arranged and defining a cooling gap. A cooling fluid flows through the tubular element and the gap. Cams are provided which axially move the pin elements to cause the automatic assembly of the object during the mould opening and then to allow extracting the moulded object.

Abstract: Method and apparatus for injection co-molding and assembling of articles made of plastic material, the articles having a first part provided with a hinge pin, and a second part provided with an annular element designed to be connected to each other by hinging. The apparatus includes a mold having separate mold cavities for two parts of the article to be produced; a first molding member, defining the mold cavity of the pin, and a second molding member, defining the mold cavity of the annular element, are axially movable and operatively connected to cam control elements forming part of the same injection mold. The cam control elements are shaped and arranged to cause, after the opening of the mold, the automatic assembling of the plastic article, via a selective sequence of axial movements of the two molding members, during the demolding step of the molded article.

Abstract: Method and apparatus for injection co-molding and assembling of articles made of plastic material, the articles having a first part provided with a hinge pin, and a second part provided with an annular element designed to be connected to each other by hinging. The apparatus includes a mold having separate mold impressions for two parts of the article to be produced; a first molding member, defining the impression of the pin, and a second molding member, defining the impression of the annular element, are axially movable and operatively connected to cam control elements forming part of the same injection mold. The cam control elements are shaped and arranged in such a way as to cause, after the opening of the mold, the automatic assembling of the plastic article, via a selective sequence of axial movements of the two molding members, during the demolding step of the molded article.