| 摘要 |
A closure (30) for a container is designed to facilitate the mixing of a first material within the container with a second material within the closure at the point of use. The first and second materials are generally chemically reactive. The plastics material closure (30) has a base (32) and a lid (34). The base (32), which is circular, has an annular peripheral rim (36) defining an annular recess (38) by which the closure (30) may be clipped onto a container (10). Radially inwardly of the rim (36) is an upstanding peripheral wall (40) defining a chamber (42) for containing the second material. A plunger (44) is affixed to the base (32) centrally of a convex button (50). When mixing of the first and second materials is required, the container (10) is positioned so that the base (32) of the closure is uppermost, and the button (50) is pressed to move the plunger (44) to push the lid (34) out of the opening of the chamber (42).
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