Abstract: The present development is for a closure which provides a liner for abutting a surface and maintaining an effective pressure against a peelable seal affixed to a container lip as the sealed container is exposed to relatively high temperature and pressure conditions. The liner which abuts a surface of the seal sandwiches the seal between the liner and the container lip. The liner defines a resting thickness at ambient temperature and pressure conditions and is made from a material capable of being compressed to a thickness less than the resting thickness and of recovering to a recovery thickness sufficient to allow the liner to maintain a positive pressure against the seal upon exposure to elevated temperatures, elevated pressure, or a combination of elevated temperature and elevated pressure.

Abstract: An arrangement comprising an open-ended container (2) and closure (10) therefor, wherein the container comprises at least one projection (6) extending at least partially its open, upper end, and wherein the closure comprises a cover for extending over the open upper end and a skirt depending therefrom having an upper (18) and a lower portion (20), whereby, the lower portion of the skirt may be flipped and removal of the cover on the container and a lowered configuration in which it engages with the projection of the container thereby to retain the cover on the container, and wherein the lower portion of the skirt is divided into at least two discrete peripheral sections that may be flipped between the raised and lowered configurations independently of each other.

Abstract: The present invention relates to a reversible child resistant cap and a closure system having two positions, the first being a child resistant position and the other being a non-child resistant position.

Abstract: The invention relates to a method of assembling a cap (20) of a closure device (9) with an open end (6, 7) of a housing container (5) for forming a container system (1) for body fluids, tissue parts or tissue cultures, whereby a relative rotating or pivoting movement is effected between the cap (20) and the housing container (5) about a common longitudinal axis (14). In order to generate the relative movement, a pressing force (F) is applied to at least one of the components to be assembled directed more or less in the direction of the longitudinal axis (14). The invention further relates to a cap (20) for forming the closure device (9), a housing container (5) and a container system (1) obtained as a result, comprising at least the cap (20), a sealing device (21) device retained in it and the housing container (5).

Abstract: A screw top closure for a two liter bottle containing carbonated drink comprises a conventional hard plastic main member with a resilient ring therearound. The ring provides a purchase to enable the closure to be tightly closed on to the neck of the bottle.

Abstract: Described is a closure for a container. The closure element has a sealing element which contains a thermoplastic polymer; an effective absorbing amount of a cyclodextrin material; and at least one amide lubricant. The cyclodextrin material may be ?-cyclodextrin, ?-cyclodextrin, ?-cyclodextrin, derivatives of ?-cyclodextrin, derivatives of ?-cyclodextrin and derivatives of ?-cyclodextrin and mixtures thereof. The sealing element forms an effective barrier against volatile migrant contaminants, such as aromatic substances, trichloroanisole, aldehydes or ketones, and reduces the contamination with oxidative decomposition products resulting from the lubricant.

Abstract: A medicine cap with a timing mechanism that automatically resets upon the removal of the cap from a medicine bottle. A timing device is housed within a medicine camp, with a diaphragm housed below the timing device. The diaphragm has a rod extending upward from a central location, and fastening the cap onto a bottle or container causes the rod to be pushed up into contact with, and activate, the timing device. Upon removal of the cap from the bottle or container, the rod loses contact with the timing device, and the timer is reset. The cap may comprise multiple pieces, so the cap may be used in child-proof mode by the engagement and disengagement of splines on the cap housing and a cap insert. Means are supplied for enabling the constant engaging of the splines.

Abstract: A seal and saver container is composed of a bottle and a cover. The bottle has an opening bored at its top and a blocking ring positioned around its inner wall. The cover placed on the top of the bottle is provided with a first upper cover, a second upper cover, a compression spring, a sleeve, an anti-leaking ring and a grip. In using, place the cover on the bottle and move the grip to keep it tilted aside, so that the sleeve is dragged to move up and simultaneously the anti-leaking ring is also moved up to keep its bottom squeezed to project outward so as to lock with the blocking ring of the bottle. So, the opening of the bottle is totally sealed up to prevent the liquid in the bottle from leaking out.

Abstract: A pump dispenser has a large ergonomic actuator designed to ergonomically deliver a composition to a substrate in the consumer's hand without the consumer having to pick up the pump dispenser. The ergonomic design allows the composition to be delivered in a proper aspect ratio to the substrate. The composition can be delivered in such a way that the composition is not aerosolized into the air or delivered to an unintended surface. The method of delivery can be made intuitive to the consumer by providing an actuator skirt that suggests the pumping mechanism or by providing a depiction of a hand or substrate over the pump dispenser. The pump dispenser is also useful for compositions or substrates that are not stable together. The pump dispenser may be designed with refill bottle capping systems such that only certain refill bottles may fit into the pump dispenser.

Abstract: A tamperproof double cap, capable of being used to add an additive, comprises: a lower cap, which is coupled to close the mouth of a beverage container, is provided with an additive storage cavity in the middle thereof, and has a hinge split notch in the bottom of the storage cavity; and a press cap, which is fitted into the storage cavity, and separates the hinge split notch when pressed. The lower cap is provided with first and second lips formed on the upper end of the storage cavity holding a tubular part of the press cap, and has vertical ribs protruding from the inner wall of a cavity tube defining the storage cavity at regular intervals. The press cap includes grooves formed in the tubular part so as to vertically move along ribs of the lower cap, and an external press thread in the upper outer circumference thereof so as to apply a vertical movement force.

Abstract: New splined fluid ports and caps for fluid ports are provided. The fluid ports and caps are straightforward in construction, are easy to manufacture and use, and are structured to be highly effective and reliable in use. The present fluid ports and caps, for example, dust caps structured to be secured to luer ports, include coupling systems, for example, including pluralities of splines and spaced apart thread segments, which provide benefits, for example, in terms of reduced manufacturing costs and ease of manufacture, relative to prior art such parts which are fully threaded to provide for coupling.

Abstract: A plastic container and closure and method of making the same. The container can include a solid bottom end, an outer sidewall extending from the solid bottom end, and a neck portion extending from the outer sidewall to create an open end of the container. The neck portion may have a spout portion having an aperture formed therein. The spout portion can be inverted to form a flange receptacle. The closure can include a sealing portion which includes a first receptacle, a spring portion that includes a second receptacle, and a planar center area configured in the center of the closure and extending inward from the spring portion. The container may be filled with a product and the closure secured to the container, over the open end, to create a primary seal and a secondary seal. When the closure is secured to the container, the spring portion can exert a sealing pressure against the neck portion of the container to create the primary seal.

Abstract: A bottle cap type additive container connectable to a mineral water bottle to improve flavor is disclosed to include a cylindrical container body threadable onto the threaded neck of a bottle, a water soluble good grade additive contained in the container body, a filter cloth-based insert inserted into the bottom open side of the container body to keep the additive inside the container body, and a seal film sealed to the bottom open side of the container body.

Abstract: The invention relates for the easy mounting a closing means on or for a closure lid made of sheet metal which is to be opened by means of twisting. It comprises a lid panel (10), a skirt portion (20) at the edge of the lid panel (10) and a sealing layer (25), which extends between a circumferential section of the lid panel and into the skirt section (25a, 25b). A safety ring (40, 30) made of non metal comprises two circumferentially extending sections. There is provided a safety section (40) with a shaped strip portion (41) that extends radially inwards and upwards and a connecting section (30) for affixing the safety section (40) to an axially lower end of the skirt portion (20). The lower end (21, 21a) of the skirt portion, which is rolled up by more than 180° is at least partly clasped (31, 32, 32a, 32b) by the connecting section (30) from an inner side of the skirt portion.

Abstract: A removable closing device (1) for a liquid food product container (2), having a neck (3) fixable in fluidtight manner to the container, and a removable cap (4) for closing the neck in fluidtight manner; the cap and the neck have mating, inclined-surface coupling means, in particular, screw means; the cap is cup-shaped, and includes a sleeve portion (5) having a threaded portion (6) and an end collar (7) which faces the neck in use; the sleeve portion having, between the threaded portion and the collar: weakening means (21) permitting, in use, elastic radial deformation of the threaded portion, so that the cap, at least the first time it is inserted, can be clicked onto the neck; and a tampering indicator (10) having shear-off stop means (11) which, in use, upon attempted removal of the cap from the neck, cooperate with and are sheared by mating stop means (12) on the neck (3).

Abstract: A composite closure for an associated container is configured to facilitate gripping and manipulation by consumers, as well as handling of closures by automated equipment. The closure includes an inner closure cap, and an outer gripping layer which is applied to at least the periphery of a skirt portion of the closure cap. Notably, the closure cap includes at least one outwardly projecting element which projects to at least the surface of the outer gripping layer. In one aspect of the invention, a plurality of projecting elements are provided in the form of annular elements which project beyond the surface of the outer gripping layer along respective margins thereof, thus facilitating handling by automated equipment. In another aspect of the invention, the projecting portion comprises graphical elements which extend through the outer gripping layer for enhanced gripping and visual appeal.

Abstract: A lightened, molded plastic closure exhibiting enhanced strength includes a top wall portion, and an internally threaded, depending annular skirt portion. The interior surface of the skirt portion, below the closure thread, defines an array of alternating grooves and lands, which together define a plurality of circumferentially spaced, vertically extending strengthening ribs on the inside surface of the skirt portion. The skirt portion thus exhibits desirably enhanced column strength, thereby facilitating efficient formation by “stripping” from an associated core pin during molding. In the preferred form, the exterior surface of the skirt portion is provided with a plurality of circumferentially spaced gripping knurls respectively aligned with the grooves defined at the interior surface of the skirt portion.

Abstract: The proposed invention is single entity that combines the utility of a typical shot glass drinking vessel with the utility of a bottle cap top. The shape and size of the proposed invention is preferably similar to that of a shot glass drinking vessel.

Abstract: A thin wall metal beverage can is described having a converging shoulder portion merging into a neck portion, the top edge of which is folded to form a flange providing an annular abutment and with a threaded sleeve sliding into the neck portion, the sleeve having an annular rib or catch which snaps over the flange abutment holding the sleeve and can neck portion against relative axial movement.

Abstract: The improved lid for containers of the object of the invention that belongs to the type that has an inner body that fits to the container by its external part and a second body in the form of a casing fitted to said inner body encasing it by its external face, and is basically characterised by the fact that the assembly of one body to the other is carried out by means of snap fitting, the inner body having a protrusion on the underside which includes a perimeter cavity into which a rib that comes from the periphery of the external body is introduced.

Abstract: A molded closure having an auxiliary thread for removal of an incomplete closure from a molding cavity, the molded closure including a helical auxiliary thread projecting inwardly from a cylindrical wall portion of the closure to provide engagement between the closure and the molding core, so that the closure may be threadably removed from the molding cavity by threadably disengaging the molding core from the molding cavity after an incomplete run of the fabrication process. A molding assembly with which the auxiliary thread may be formed in a molded closure is also provided.

Abstract: Closing cap (1) for a receptacle, typically a bottle with a threaded neck comprising an outer cap (2) typically provided with a top (20) and a skirt (21), and an insert (3) made of a plastic material with a threaded skirt (31) fixed to the said outer cap (2), characterised in that the said threaded skirt (31) comprises an inner thread (32), and the thickness of the bottom (320) varies from 0.40 mm to 0.150 mm.

Abstract: The present invention provides a culture container and a cap for a container having a ventilation filter medium or a medium similar thereto that can exchange carbon dioxide gas in the culture container with atmospheric air, and prevent the contamination of sterilized culture medium inside the culture container with fungi, mites, and the like. A culture bottle includes a bottle unit, and a cap that is mounted on an opening. The cap includes a cap unit, and a ventilation filter medium. A hole is provided in the cap unit. The ventilation filter medium includes a plurality of micropores having a pore diameter between 0.1 and 50 micrometers, and is mounted on the hole.

Abstract: A package, especially for granular, powdered or fluid product, includes a container with a spout extending upward and inward from a threaded neck and then flaring outward to terminate in a circular rim forming a wide mouth container opening. A closure as an end wall coextensive with the container rim in a skirt curving downward and outward with threads formed on an inner surface at a cylindrical lower end. Sealing elements include an annular sealing flange extending downward and inward from the end wall and having an outer sealing surface which seals against the inner surface of the flared portion of the container. An upper portion of the inner surface of the skirt formed by an annular rib extends downwardly and outwardly from the end wall to form an upwardly converging gap into which the flared portion is wedged as the closure is applied to the container.

Abstract: A threaded container closure assembly in which the container comprises one or more radially extending members proximate the distal end thereof that initially engage with one or more radially extending members or partial radially extending members on a mating closure or top proximate the distal end thereof so that the container and top become at least partially interconnected and are thereby not too easily and inadvertently separated while the user attempts to cause engagement of the threads for screwing down the top onto the container.

Abstract: A self-draining container neck and closure comprising a container neck having an upper sidewall portion and a lower sidewall portion, the upper sidewall portion being inset from the lower sidewall portion. The container neck also includes a tamper indicating bead having at least one draining notch therein. The instant invention also includes a closure having a plurality of drainage slots disposed in a spaced configuration. The closure is threadably connected to the container neck, the closure and container threads rotatably engage and provide a drainage path there between.

Abstract: A tamper indicating band arrester is described herein for use with a container neck or finish bead comprising an upper portion and a lower portion. The TI band has an annular step having a smaller diameter than the lower portion of the finish bead. The TI band further comprises a TI bead which positioned beneath the lower portion of the container neck or finish bead. The plurality of frangible webs or bridges are located above the annular step and adjacent the upper portion of the finish bead. The thickened cross section of the annular step provides interference between the TI band and container neck bead inhibiting the TI band from tiring over the container neck bead when opened.

Abstract: A plastic closure includes a closure shell having a base wall, a peripheral skirt with an internal thread for securing the closure to a container finish, and an annular lip extending from the closure skirt adjacent to the base wall and defining an inside lip surface at an acute angle to the closure base wall. A liner is compression molded in situ onto the base wall and peripherally within the lip. The liner has a liner base portion extending along the base wall and a peripheral portion extending along the inside surface of the lip. The liner has an interior surface—i.e.

Abstract: A closure and container combination has in which anti-backoff capability the closure includes a top wall and a depending annular skirt having closure threading formed on an inner surface of the skirt. The closure threads mate with threads on the container. One or more anti-backoff members are formed on the inner surface of the skirt and/or the outer surface of the container neck and arranged and configured to frictionally engage the mating threading between the anti-backoff member and the threading to resist movement of the closure once secured onto the neck of the container.

Abstract: A closure for use on a container having an externally threaded neck is disclosed wherein an inner surface of a downwardly depending skirt portion of the closure cap includes a helical thread having a flat upper surface with a lower thread profile having a first depth greater than an upper thread profile of a second depth. The helical thread of the closure tapers into the sidewalk of the closure skirt. The closure is provided with a seal integral with the inner surface of the skirt, spaced from a top wall of the closure, and retained at a lowermost point along the downwardly depending skirt by a bead.

Abstract: A closure is provided for an opening in a container having a wall around the opening and at least one thread on the wall. The closure includes (1) an attachment wall defining at least one thread for threadingly engaging the container wall thread, (2) an occlusion wall closing the attachment wall to occlude the container opening when the container is in the closed position, and (3) a continuously curving, peripheral, finger-engaging surface which defines (1) a plurality of circumferentially spaced protuberances, (2) a finger-receiving recess between adjacent protuberances, and (3) a finger-engaging rib projecting laterally from each of the protuberances.

Abstract: A bottle closure having an outer shell with a frusto-conical configuration and a rib-supported threaded inner shell is described. The frusto-conical configuration of the outer shell allows the user to easily pickup the package and grip the closure and remove it from a bottle. The inner shell is threaded to allow the closure to engagingly mate with threads on a bottle or similar container. The inner shell is supported by ribs which face toward the outer shell. The ribs provide that the inner shell can be unscrewed from a threaded core of a manufacturing mold during production without causing noticeable distortion in the closure.

Abstract: A dual chambered beverage bottle made of synthetic resin is described. The bottle has a cylindrical body member that is divided by a partition wall perpendicularly disposed in the body member to form separate chambers, so that it is possible to contain two different drinks in the chambers. The beverage bottle has a cup which is secured to the bottle spout member as a cap in a substantially liquid-tight relationship, so that users do not need a separate cup to receive drinks poured out of the bottle and may enjoy greatly enhanced convenience when traveling or engaging in sports activities.

Abstract: An integrated container crimping and cutting tool arrangement having a tub with an opening therein providing access to an otherwise surrounded volume, and a cover mountable on the tub having an opening at which the cover can be releasably mounted on the tub to prevent immediate access to the surrounded volume therein. In addition, this arrangement has a closed wall structure provided as a portion thereof having an ending edge terminating a closed wall which also has a crimping edge thereon offset away from the ending edge to allow pressing it against a sandwich to cut out center portions thereof leaving sealed bread edges.

Abstract: A method for at least locally providing an article coated with an organic coating with a layer of readily deformable sealing material (so-called compound), which involves a layer of an intermediate of the compound being applied to the coating layer, after which the article is temporarily kept at an elevated temperature in order to form the compound from its intermediate, wherein the coating layer of the article comprises a polyethylene terephthalate and the compound is chosen from the group consisting of urethanes, amides, mixtures thereof and heteropolymers thereof, and in that the free surface of the coating layer prior to the application of the intermediate of the compound, at least at the location where this intermediate is applied, is briefly subjected to a processing operation from the group of equivalent processing operations comprising a flame treatment in the course of which the coating layer does not melt.

Abstract: A cap 10 which has a female screw 14 in the inner peripheral surface and which is to be screwed on a port neck part 13 of a container main body 11 holding a predetermined liquid, wherein a plurality of ribs 18 radially extending astride from an inner surface of a top surface part 16 of the cap 10 to an inner surface of a peripheral wall part and integrally projecting inwards are formed on a peripheral edge part 17 of the inner surface of the top surface part 16. A female screw 14 is a screw in the form of two threads composed of spiral mated ridges 14a, 14b of two threads, for example. The liquid held in the container main body 11 is, for example, a chlorine-based bleach which contains a surface active agent and a sodium hypochlorite. The mated ridges 14a, 14b each are 80 to 120 degrees in thread angle &thgr; and 1 to 15% of a valley radius of the female screw 14 in thread height H.

Abstract: A closure system useful for storing fluids under cold storage conditions. The closure system includes cap and container components which combine to form a dual sealing system. The container has a generally cylindrical side wall, a closed bottom end, and an open top end having an inner beveled lip depending from an annular top rim. The cap has a generally circular top wall from which inner and outer skirts depend. The outer skirt is adapted to grip the open top end of the container. The inner skirt includes an outer surface having a lower seal bead and an upper beveled portion mated with the beveled lip. When the cap is fitted onto the container, the seal bead contacts an inner surface of the container and the upper beveled portion and the beveled lip are engaged in an interference fit, thereby impeding the loss of fluid from the closure system under cold storage conditions.

Abstract: A container finish comprising a helical load carrying member which transmits downward force from the top wall of a closure to the threads of a container to prevent seal failure under stacking load conditions. The helical load carrying member is preferably located on a container neck, parallel to a primary thread. In the alternative the helical load carrying member may be located on a closure finish.

Abstract: A grip cap for a container has a thermoplastic shell in an inverted cup shape with a top wall and a skirt bounded by a lower rim. An elastomeric layer is integrally molded to the cap shell along the outer surface of the top wall and the skirt as well as along the underside of the lower rim. This layer defines multiple spaced apart and raised vertical ribs joined by a pad at the top wall and a gasket extending along the lower rim. The ribs and the pad provide a cushion and the gasket can seal against a shoulder of the container when tightened. Also disclosed is a two-shot method of molding such a grip cap, including integral resilient material at the outer surfaces and the underside of the cap shell rim.

Abstract: A molded closure having an auxiliary thread for removal of an incomplete closure from a molding cavity, the molded closure including a helical auxiliary thread projecting inwardly from a cylindrical wall portion of the closure to provide engagement between the closure and the molding core, so that the closure may be threadably removed from the molding cavity by threadably disengaging the molding core from the molding cavity after an incomplete run of the fabrication process. A molding assembly with which the auxiliary thread may be formed in a molded closure is also provided.

Abstract: A plastic closure includes a closure shell having a base wall, a peripheral skirt with an internal thread for securing the closure to a container finish, and an annular lip extending from the closure skirt adjacent to the base wall and defining an inside lip surface at an acute angle to the closure base wall. A liner is compression molded in situ onto the base wall and peripherally within the lip. The liner has a liner base portion extending along the base wall and a peripheral portion extending along the inside surface of the lip. The liner has an interior surface—i.e.

Abstract: A closure for a container with a neck portion and an external helical thread formed on the neck portion includes an upper wall and a skirt formed integrally with and extending generally downwardly from the upper wall. An internal helical thread is formed on the skirt for engaging the external helical thread of the neck portion to thereby secure the closure to the container. The internal helical thread is preferably asymmetrical in cross section. A first annular seal extends generally radially inwardly toward a central axis of the closure from the inner skirt surface. The first annular seal sealingly engages the outer surface of the neck portion. A second annular seal extends generally axially downwardly from the upper wall and sealingly engage an inner surface of the neck portion. A thickness of the neck portion between the first and second annular seals is greater than the distance between the first and second annular seals before installation of the closure on the container.

Abstract: A tamper-evident, snap-on, screw-off closure is used with a specially shaped container neck. One neck has double lead external threads and, below the threads, a conical wall having external ratchet teeth. The closure has an upper skirt having internal threads mating with the neck threads. A conical lower skirt is connected to the upper skirt by a plurality of frangible bridges. The lower skirt has internal ratchet teeth to mate with the neck ratchet teeth. The cap skirt threads are double pitch and slightly over 360° in length. When the cap is applied to the neck it snaps on in two stages. The lower skirt has a tear tab which, when pulled, fractures the lower skirt on a vertical line. Continued pulling on the tab sequentially fractures the bridges. Another neck has a neck stretch with multiple neck threads and a locking wall below the neck stretch with a plurality of external teeth.

Abstract: A letter or number shaped bottle (10) that is filled with a potable fluid (80) such as a natural-spring drinking water or a fruit juice. The letter bottles are constructed of hollow letter shaped structures (12) that range from A to Z, and the number bottles are constructed of hollow number shaped structures (14) that range from 1 to 0, The hollow structures (12, 14) each include an upper bottle opening (36) having integrally attached a tubular neck (38) to which is releasably attached a bottle cap (50) which when removed, the fluid (80) in the bottle can be consumed. Before or after the fluid is consumed the letter bottles can be used as a teaching aid to teach individuals, and particularly school-age children, the alphabet. Likewise, the number bottles can be used to teach correct number sequencing. The invention also includes a tray (70) that allows a set of letter (12), number (14), and/or punctuation mark (15) bottles to be stored or displayed in selected arrangements.

Abstract: A safety container has a container body of cylindrical shape and having a cap. Opening of the cap is prevented by a safety cover which surrounds the cylindrical body. The safety cover may be removed only by a user gripping the container body through opposed ends of the safety cover using one hang, and gripping the safety cover itself with the other hand. The. configuration of the safety cover is such that a child's hand does not have sufficient span to grip the container body.

Abstract: Process for manufacturing a metal can with a threaded neck on which a removable head can be fitted, includes the steps of forming a can with a closed bottom end, a cylindrical wall and an open top end, forming a neck at the open top end, obtaining a ring with a spindle hole of known diameter and a threaded external surface, sleeve fitting the ring by driving the spindle hole over the neck, and plastically expanding the neck by an amount sufficient that its outer diameter exceeds the diameter of the spindle hole when unstressed.

Abstract: A closure system useful for storing fluids under cold storage conditions. The closure system includes cap and container components which combine to form a dual sealing system. The container has a generally cylindrical side wall, a closed bottom end, and an open top end having an inner beveled lip depending from an annular top rim. The cap has a generally circular top wall from which inner and outer skirts depend. The outer skirt is adapted to grip the open top end of the container. The inner skirt includes an outer surface having a lower seal bead and an upper beveled portion mated with the beveled lip. When the cap is fitted onto the container, the seal bead contacts an inner surface of the container and the upper beveled portion and the beveled lip are engaged in an interference fit, thereby impeding the loss of fluid from the closure system under cold storage conditions.

Abstract: A closure member for a container, including a first member having a first set of threads with a predetermined pitch and a first orifice formed therethrough, and a second member having first and second sets of threads, both with the same pitch as the first set of threads of the first member, and a first orifice formed therethrough. When the threads of the first and second members are fully engaged, alignment between the first orifices formed through the first and second members occurs only when the first set of threads of the first member engages the first set of threads of the second member.

Abstract: A closure has a first screw thread (11) capable of cooperating with a second screw thread formed by a container intended to receive the closure. An elastically deformed part (28, 31) is capable, when the first (11) and second screw threads are engaged, of keeping the closure bearing elastically on the container in at least one direction oriented radially with respect to the closure, so as to improve the holding and working of the closure on the container.

Abstract: A closure for a container with a neck portion and an external helical thread formed on the neck portion includes an upper wall and a skirt formed integrally with and extending generally downwardly from the upper wall. An internal helical thread is formed on the skirt for engaging the external helical thread of the neck portion to thereby secure the closure to the container. The internal helical thread is preferably asymmetrical in cross section. A first annular seal extends generally radially inwardly toward a central axis of the closure from the inner skirt surface. The first annular seal sealingly engages the outer surface of the neck portion. A second annular seal extends generally axially downwardly from the upper wall and sealingly engage an inner surface of the neck portion. A thickness of the neck portion between the first and second annular seals is greater than the distance between the first and second annular seals before installation of the closure on the container.