| 摘要 |
<p>Pump dispensers are disclosed of the airless type in which the container interior reduces volume progressively as product is dispensed. The aim is to trap any air in the container space above the product, which might reduce a dispensed dose without the user knowing. An air trap member (5) having a downwardly-convex dish form is provided below the floor of the dispenser module around the inlet, to guide any such air away to the periphery. At the periphery a retaining lip (53), which may make flexible wiping contact with the container wall interior, allows air past on assembly of the dispenser. A central tubular formation (52) of the trap member (5) is used to plug the trap member into the inlet. A follower piston (15) may have a central boss (152) shaped to fit into the trap member (5), to maximise expulsion of product.</p> |
