Abstract: A closure element is provided made of plastic, particularly for sealing off at least one opening 2, 3 in at least one support member 20, 30, in particular, in a automotive body, the closure element including a head section 4 located above the support, and a basic body portion 5 extending through the support 20, 30. At least one region of the closure element is made of a material which expands under the influence of temperature. The basic body portion 5 and the head section 4 of the closure element 1' is preferably formed of a single piece of thermal plastic material, which, is with increased thermal influence, media-tight bondable via a gluing action within the openings 2, 3.

Abstract: A method for manufacturing multilayer molded articles of at least two plastics material components having substantially different properties with respect to behavior, processing and/or temperature changes. The plastics material components are injected from different extruder unit through a common sprue brushing into a mold cavity of a molding tool. The plastics material components are introduced in a predetermined time sequence initially into different cross-sectional areas of a common sprue cone and are subsequently forced into the sprue cone in a converging manner toward a sprue duct of the sprue bushing.