Flow control insert

Abstract

A flow control insert (102) for a dispensing closure is provided. The insert has a plurality of dispensing slits (that define petals. (120,122,124,126). The petals are formed in an open position and are closed upon assembly of the insert into a dispensing closure.

Claims

1. A flow control insert for a dispensing closure, the flow control insert consists of a single piece molding having an axis, the flow control insert including a head which has a plurality of dispensing slits that define petals, in an as-molded condition the petals are formed in an open position, in which the petals are closed upon assembly of the flow control insert directly into a dispensing closure, wherein geometry of the flow control insert in the as-molded condition is selected so that when the flow control insert is directly inserted into the dispensing closure, pressure is applied to the head, along the axis and against the petals, by the dispensing closure, and the petals close to provide a seal.

2. A flow control insert according to claim 1, wherein the flow control insert is molded in PP, PE, TPE or TPS.

3. A flow control insert according to claim 1, further including a sidewall.

4. A flow control insert according to claim 1, wherein the flow control insert has a central hole.

5. A flow control insert according to claim 1, wherein in the as-molded condition the flow control insert has two, three, four or five petals.

6. A flow control insert in combination with a dispensing closure having a housing adapted to receive the flow control insert, the flow control insert consists of a single piece molding having an axis, the flow control insert having an insert engagement means adapted to engage the housing and thereby to be received directly into the dispensing closure housing in use, the flow control insert has a head having a plurality of dispensing slits that define petals, in an as-molded condition the petals are formed in an open position, in which the petals are at least partially closed upon assembly into the dispensing closure by pressure applied to the head, along the axis and against the petals, by the dispensing closure.

7. A combination according to claim 6, wherein the insert engagement means includes a bead projecting radially outward from an exterior wall for snap-fitting the flow control insert into the dispensing closure.

8. A combination according to claim 6, wherein a snap-fit seal is achieved between an insert sealing bead and a corresponding projection on a surface of an inner radial wall of the dispensing closure.

9. A combination according to claim 6, wherein a surface of an inner radial wall of the dispensing closure is formed so as to help retain the flow control insert in place.

10. A combination according to claim 6, wherein an inner radial wall of the dispensing closure has a reduced diameter at a lower end such that the flow control insert has to be forced past this reduced diameter before reaching a section of the dispensing closure which has a slightly greater diameter, and wherein the diameter of the section of the dispensing closure, which is slightly reduced in diameter, is less than the maximum diameter of the flow control insert as measured in a plane defined by an annular sealing bead.

11. A combination according to claim 6, wherein the flow control insert is molded in PP, PE, TPE or TPS.

12. A combination according to claim 6, wherein the flow control insert further includes a sidewall.

13. A combination according to claim 6, wherein the flow control insert has a central hole.

14. A combination according to claim 6, wherein the flow control insert in the as-molded condition, has two, three, four or five petals.

Description

BRIEF DESCRIPTION OF THE DRAWINGS:

(1) FIG. 1 depicts a self-closing valve sub-assembly in accordance with the present invention.

(2) FIG. 2 shows a one-piece molded insert with a sidewall in accordance with the present invention.

(3) FIGS. 3-4 depict alternative inserts in accordance with aspects of the present invention.

(4) FIG. 5 shows an insert formed in accordance with the present invention and shown fitted into the base of a flip-top dispensing closure.

(5) FIGS. 6-9 depict the insert is formed by injection molding.

(6) FIG. 10 shows a cross-sectional side view of an insert formed in accordance with the present invention.

(7) FIGS. 11-13 depict an insert with four petals in accordance with the present invention.

(8) FIG. 14 depicts an insert with five petals in accordance with the present invention.

(9) FIG. 15 depicts an insert with three petals in accordance with the present invention.

(10) FIG. 16 depicts an insert with two petals in accordance with the present invention.

(11) The present invention is more particularly described and shown in the accompanying drawing.

(12) All orientational terms, such as upper, lower, radially and axially, are used in relation to the drawing and should not be interpreted as limiting on the invention or its connection to a closure.

(13) The example embodiment is described in sufficient detail to enable those of ordinary skill in the art to embody and implement the systems and processes herein described. It is important to understand that embodiments can be provided in many alternate forms and should not be construed as limited to the examples set forth herein.

(14) Accordingly, while embodiments can be modified in various ways and take on various alternative forms, specific embodiments thereof are shown in the drawings and described in detail below as examples. There is no intent to limit to the particular forms disclosed and as well as individual embodiments the invention is intended to cover combinations of those embodiments as well. On the contrary, all modifications, equivalents, and alternatives falling within the scope of the appended claims should be included. Elements of the example embodiments are consistently denoted by the same reference numerals throughout the drawings and detailed description where appropriate.

(15) The terminology used herein is not intended to limit the scope. The articles “a,” “an,” and “the” are singular in that they have a single referent; however, the use of the singular form in the present document should not preclude the presence of more than one referent. In other words, elements referred to in the singular can number one or more, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises,” “comprising,” “includes,” and/or “including,” when used herein, specify the presence of stated features, items, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, items, steps, operations, elements, components, and/or groups thereof.

(16) Unless otherwise defined, all terms (including technical and scientific terms) used herein are to be interpreted as is customary in the art. It will be further understood that terms in common usage should also be interpreted as is customary in the relevant art and not in an idealised or overly formal sense unless expressly so defined herein.

(17) Referring to FIG. 1 a self-closing valve sub-assembly is generally indicated 1. The sub-assembly 1 is described in detail in WO2006/021509.

(18) A retaining ring 2 consists of a moulded single-piece article with a so called “chimney” in the form of a circular wall 3. The chimney 3 provides a surface for assembly machinery to handle the retaining ring 2. At one end of the chimney 3 is a radially outwardly sloping surface 4. At the outer radial end of this sloping surface 4 another circular wall 5, which has the same rotational axis as chimney 3, extends upwards.

(19) Along the circumference of the radially outer surface of wall 5 is a projection in the form of an external sealing bead 6.

(20) At the end of wall 5 is a crimping flange 7 which in its uncrimped condition (not shown) is a relatively short upstanding wall.

(21) A flexible self-closing valve 8 typically has the features shown in FIG. 1. For instance, such a valve 8 has a head portion 8a which is thicker towards the edge than the centre and which has at least one slit 8b therein. The head portion 8a is concave with respect to a container (not shown). This pre-stresses the valve so that it self-closes more easily.

(22) A side-wall portion 8c connects the head portion 8a with a flange 8d. Flange 8d is typically shaped such that it has a relatively substantial size in the form of a rim. It is the underside of this flange 8d which rests on the sloping surface 4 of the retaining ring 2 when it is located correctly.

(23) To crimp the valve 8 in place, the crimping flange 7 is bent over until is sandwiches the flange 8d between itself and the sloping surface 4 as shown in the Figure.

(24) The crimping flange 7 is bent over along the entire circumference of the retaining ring 1 and valve 2.

(25) The sub-assembly 1 allows the valve 8 to be presented in a form which can be easily manipulated and fitted into a dispensing closure. The bead 6 allows the ring 2 to be snap-fitted into a closure with a corresponding bead to hold the ring 2, and consequently the valve, firmly in place.

(26) The form of the inserts shown in FIGS. 2-4 6-9 and 11-16 is generally similar to the ring shown in FIG. 1. In particular the peripheries of the inserts are designed to be standardised with existing retaining rings. This means that valved and valveless inserts can be used interchangeably on the same dispensing closures. Moreover, by standardising at least the engaging parts of the insert it becomes very simple to interchange different types of inserts into the same dispensing closure.

(27) FIG. 2, for example, shows a one-piece moulded insert 102 with a sidewall 103. At one end of the sidewall are four generally triangular petals 120, 122, 124, 126. The petals are formed in a raised/open position; there is no post-formation slitting operation required to separate the petals (e.g. with slitting).

(28) Inserts formed in accordance with this principle are shown in FIGS. 3 and 4.

(29) FIG. 5 shows an insert formed in accordance with the present invention and shown fitted into the base 230 of a flip-top dispensing closure. The petals 220, 222, 224, 226 are shown in a closed position; vertical/axial compression is required during assembly to close the slits. The closure deforms the insert to close the slits. The insert has a central hole 228 pluggable by a closure lid spigot (not shown) in use.

(30) In the embodiment of FIGS. 6 to 9 the insert 302 is formed by injection moulding the design with the petals open i.e. not slit after moulding; then using the closure to offer a positive pressure against the open slits to close them upon assembly to the closure (see dotted lines on section A-A of FIG. 9).

(31) In the as-moulded condition there are four petals (in other embodiments different numbers of slits and consequential petals are possible: the inserts 502a, 502b, 502c of FIG. 11-13 has four petals; the insert 602 of FIG. 14 has five petals; FIG. 15 has three petals; FIG. 16 has two petals). The geometry of the insert in the as-moulded condition is selected so that when the insert is inserted into the closure, and radially and/or axial inward pressure is applied to the insert head 119 by the closure, the petals close to provide a seal.

(32) FIG. 10 shows a cross-sectional side view of an insert formed in accordance with the present invention, as an alternate to detail C of section B-B of FIG. 9, and shown in place in a dispensing closure, using standardised retention beads 406, 440. In this embodiment a snap-fit seal is achieved between the insert sealing bead 406 and a corresponding projection 440 on the surface of an inner radial wall of the dispensing closure. Further, it is seen that the surface of the inner radial wall of the closure is formed so as to help retain the insert in place. This is achieved by the inner radial wall having a reduced diameter at the lower end such that the insert has to be forced past this reduced diameter before reaching the section of the closure which has a slightly greater diameter. The diameter of the section of the closure, which is slightly reduced in diameter, is less than the maximum diameter of the insert (as measured in the plane of the annular sealing bead).

(33) Once in position the insert may function in the same way as a typical self-closing valve (formed by post-moulding slitting) i.e. when the container is squeezed the product is forced through the slits of the insert which open in response to the increase in pressure within the container.

(34) Although illustrative embodiments of the invention have been disclosed in detail herein, with reference to the accompanying drawings, it is understood that the invention is not limited to the precise embodiments shown and that various changes and modifications can be effected therein by one skilled in the art without departing from the scope of the invention as defined by the appended claims and their equivalents.