The present disclosure relates to dispensing closures for fluid products such as beverages, food condiments and body lotions, and more particularly to a dispensing valve and method of manufacture for such closures.
U.S. Pat. No. 6,672,487 discloses a fluid dispensing closure and a package that includes a container having a body for holding a product to be dispensed and a finish having an open mouth. A dispensing closure is mounted on the container finish. In one embodiment, the dispensing closure includes a base and a lid integrally hinged to the base. The base has a deck with a dispensing opening. A flexible resilient dispensing valve is mounted within the dispensing opening by a separate retaining ring secured to the deck surrounding the dispensing opening. A general object of the present disclosure is to provide a dispensing valve, a dispensing closure embodying a dispensing valve, and a method of making a dispensing valve, in which the dispensing valve element is integrally molded to the valve mounting ring structure to facilitate handling of the valve after molding and automated assembly of the valve/mounting ring to the dispensing closure shell or other support structure.
The present disclosure embodies a number of aspects or inventions, which can be implemented separately from or in combination with each other.
A dispensing valve in accordance with one aspect of the present disclosure includes an annular ring of relatively rigid molded plastic construction and a flexible resilient valve element integrally molded with the ring. The ring and the valve element have at least one mechanical interlock to secure the valve element to the ring as the valve element is molded onto the ring. In some embodiments of the disclosure, the mechanical interlock includes through-openings in an inner periphery of the annular ring and pegs on the outer periphery of the valve element that are molded into the through-openings as the valve element is molded onto the annular ring.
A dispensing valve in accordance with another aspect of the present disclosure includes an annular ring of relatively rigid molding plastic construction having an outer periphery for securing the valve within a dispensing opening and an inner periphery in the form of an annular ledge having an angularly spaced array of openings. A flexible resilient valve element is molded onto the ring so as to have an outer peripheral portion engaged with the ledge of the ring and integral pegs that extend into the openings on the ring to lock the valve element to the ring. Each of the openings in the mounting ring preferably is a through-opening that includes an enlarged portion opening at one axially facing surface of the ring ledge, and an ensmalled portion aligned with the enlarged portion and opening at a second axially facing surface of the ledge. The valve element preferably includes an annular flange in opposed engagement with the second axially facing surface of the ring ledge, and pegs integrally molded with the flat annular flange extending through the ensmalled portions of the through-openings into the enlarged portions of the openings.
A dispensing valve in accordance with a further aspect of the disclosure is of one-piece integrally molded construction that includes a ring of relatively rigid thermoplastic or thermosetting resin construction and a flexible resilient valve element of thermoplastic or thermosetting resin construction. The ring and the valve preferably are sequentially molded, and the ring preferably is of a material having a higher melt or higher softening temperature than that of the valve element. The valve element preferably is of silicone composition and the ring preferably is of nylon composition.
The disclosure, together with additional objects, features, advantages and aspects thereof, will best be understood from the following description, the appended claims and the accompanying drawings, in which:
Dispensing closure 24 in the illustrated embodiment of the disclosure is a two-piece assembly that includes a shell 34 to which a dispensing valve 36 is secured. Shell 34 preferably is of one-piece integrally molded plastic construction, as shown in
Base 40 includes a central deck 50. The central portion 52 of deck 50 may be of domed, such as generally conical, construction. A dispensing opening 54 is positioned in deck central portion 52, preferably centrally positioned. As best seen in
Deck 50 in the exemplary closure includes a raised wall 72 that partially surrounds the central portion 52 of the deck. Raised wall 72 has a greatest axial height adjacent to hinge 44, and decreases in height symmetrically in both directions around the periphery of central portion 52, preferably to zero height at a position diametrically spaced from hinge 44. The decreasing height of wall 72 is best seen in
The peripheral portion of deck 50 also includes a ledge 78 that is axially recessed with respect to domed central portion 52. Ledge 78 extends entirely around central portion 52 in a plane that preferably is perpendicular to the axis of base 40. A radially outwardly extending circumferential bead 80 extends at least part way around deck 50 axially adjacent to but spaced from ledge 78. Ledge 78 is enlarged at 79 diametrically opposite hinge 44.
Lid 42 includes a base wall 82 and a peripheral skirt 84. The edge of skirt 84 remote from base wall 82 preferably lies in a plane, and is adapted for edge engagement with ledge 78 on base 40 in the closed position of the lid (
Dispensing valve 36 is shown in detail in
Mounting ring 100 includes an outer periphery formed by an annular wall 106 with suitable structure for mounting valve 36 within the dispensing closure shell. A ledge 108 extends radially inwardly from wall 106. Ledge 108 preferably is flat and perpendicular to the central axis of wall 106. A plurality of openings 110 extend into ledge 108 in an angularly spaced array round the axis of the dispensing closure. Openings 110 preferably are identical, and preferably are through-openings that include an enlarged portion 112 that opens at one axially facing surface 114 of ledge 108, and an aligned but relatively ensmalled portion 116 that opens at an opposing axially facing surface 118 of wall 108. Valve element 102 as molded has a flat annular radially outwardly extending flange portion 120 with a circumferential array of axially extending pegs 122 that extend through ensmalled portions 116 of openings 110 into enlarged portions 112. Flange portion 120 is in facing engagement with axially facing surface 118 of ledge 108, so that pegs 122 extend through ensmalled portions 116 and into enlarged portions 112 of openings 1110, thereby mechanically locking valve 102 to mounting ring 100 entirely around the periphery of the valve. Valve element 102 in the illustrated embodiment includes a central portion 136 integral with flange 120. Central portion 136 includes one or more slits 138 (
Valve 36, 130, 140 or 150 is mounted within closure shell 34, in the illustrated embodiments of the disclosure, by being secured by snap fit within wall 56 and retained by bead 62 (
Valves 36, 130, 140, 150 can be made in a two-step operation in which mounting rings 100, 134, 142, 156 are first molded, and the mounting rings are then placed in a suitable mold for molding valve elements 102, 132, 144, 158 onto the mounting ring in a suitable insert molding operation. However, and more preferably in accordance with the present disclosure, valves 36, 130, 140, 150 are molded in a single-step two-material molding operation. In such an operation, mounting rings 100, 134, 142, 156 are first molded in a suitably formed mold cavity. One or more of the mold sections that form the mold cavity then are moved or repositioned to form a second mold cavity in which dispensing valve element 102, 132, 144 or 158 is integrally molded onto the mounting ring. In either event, the dispensing valve exits the mold as a completed assembly, which greatly facilitates handling of the dispensing valve and automated assembly of the dispensing valve to a closure shell or other support structure. It also is noted that the dispensing valve, including the mounting ring and the valve element, forms an “engine” that can be employed in combination with dispensing closure shells of many differing geometries. Thus, a single dispensing valve engine can be employed in combination with dispensing closure shells for differing customers and/or applications.
As noted above, the materials of the mounting ring and the valve element are selected to achieve the desired results, including the ability of the first-molded mounting ring to withstand the molding and cure temperatures of the second-molded dispensing valve. In other words, when using the preferred sequential injection molding technique, the melt temperature or the softening temperature of the first-molded component, preferably the ring, is higher than the melt temperature of the second-molded component, preferably the valve element. The ring preferably is of relatively rigid thermoplastic or thermosetting resin construction, and the valve element preferably is of flexible resilient thermoplastic or thermosetting resin construction. Silicone, specifically LSR, a thermosetting resin, is preferred for the valve element. Thermoplastic elastomers, such as styrenic copolymers, such as SBS (styrene-butylene-styrene), SIBS (styrene-isobutylene-styrene), SEBS (styrene-ethylene-butylene-styrene) and SEPS (styrene-ethylene-propylene-styrene), could be used for the valve element. Thermoplastic resins such as polyphenol amide, polyphenol amine, polybutylene terephthalate, nylon and glass-filled polypropylene, can be used for the ring.
There thus have been disclosed a dispensing valve, a dispensing closure and a method of making a dispensing valve that fully achieve all of the objects and aims previously set forth. The disclosure has been presented in conjunction with several presently preferred embodiments of the dispensing valve, and a number of modifications and variations have been discussed. Other modifications and variations readily will suggest themselves to persons of ordinary skill in the art. The disclosure is intended to embrace all such modifications and variations as fall within the spirit and broad scope of the appended claims.