Dispensing closures and dispensers
A dispensing closure for dispensing fluid product from a squeeze container consists of an outer cap element ( 3 ) and an inner element or valve disc ( 4 ) fitting inside the cap element. Each is moulded from thermoplastics; no elastomer is used. The cap element includes an outwardly-deflectable diaphragm wall ( 35 ) around a central outlet opening ( 361 ). The inner element ( 4 ) has a peripheral mounting ring ( 41 ), a central blocking portion ( 48 ) and a set of support spokes ( 46 ) providing flow clearance between them. In a closed position the blocking portion closes the outlet opening. In an outflow condition the diaphragm wall ( 35 ) deflects outwardly to allow flow. In a recovery mode the blocking portion ( 48 ) deflects inwardly for compensation air or residual liquid product to enter the container.
1. A dispensing closure for a squeezable container, the closure comprising:
an integrally formed outer cap having a cylindrical outer wall extending downward from a flexible diaphragm forming a generally flat and planar top wall of the outer cap, said top wall including an outlet aperture within a central portion and said cylindrical wall including retaining formations;
an inner element comprising a central disc, a central blocking portion, and at least one flow opening to permit fluid to flow through the inner element;
wherein the flexible diaphragm temporarily flexes away from the inner element in response to dispensing pressure; and
wherein the inner element engages the outer cap with sufficient axial force so that the central blocking portion seals the outlet aperture when the dispensing pressure is not applied to the flexible diaphragm.
2. The closure of claim 1 further comprising cooperating snap formations provided on the outer cap and the inner element.
3. The closure of claim 1 wherein the central blocking portion is positioned concentrically within a plurality of flow openings.
4. The closure of claim 3 wherein at least one support spoke is positioned between the flow openings.
5. The closure of claim 4 wherein an outer flange is positioned along a peripheral edge of the inner element, said outer flange sealing the inner element to the top wall.
6. The closure of claim 1 wherein the outlet aperture is positioned concentrically within a plurality of dished indentations formed in the flexible diaphragm.
7. The closure of claim 1 wherein the blocking portion includes a cylindrical rod extending upward through the outlet aperture.
8. The closure of claim 7 wherein the cylindrical rod is positioned concentrically within and spaced apart from a surround tube attached to the top wall and extending upward from the outlet aperture.
9. The closure of claim 7 wherein a flat wall of the blocking portion encircles the cylindrical rod, said flattened wall engaging a rib formation on the top wall to seal the outlet aperture.
10. The closure of claim 7 wherein at least one prop formation projects upward from the central disc, said prop formation engaging the top wall when dispensing pressure is applied so as to define the flow opening.
11. The closure of claim 10 wherein the central blocking portion is positioned concentrically within a plurality of prop formations.
12. The closure of claim 10 wherein the prop formation is formed integrally with a retaining ring attached to a top surface of the inner element.
13. The closure of claim 1 wherein at least one prop formation projects upward from the central disc, said prop formation engaging the top wall when dispensing pressure is applied so as to define the flow opening.
14. The closure of claim 13 wherein the central blocking portion is positioned concentrically within a plurality of prop formations.
15. The closure of claim 13 wherein the prop formation is formed integrally with a retaining ring attached to a top surface of the inner element.
16. The closure of claim 1 wherein an outer flange is positioned along a peripheral edge of the inner element, said outer flange sealing the inner element to the top wall.