Abstract: A closure for containers has a septum of elastomeric material which is self-resealing when punctured by a blunt ended tubular implement to access to the contents of the container. In one application the elastomeric closure is incorporated in a cap for a bottle or vial and is self-resealing after being punctured by a laboratory pipette.

Abstract: The present development is for a closure which provides a means for 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 closure includes a liner which abuts a surface of the seal so as to sandwich the seal between the liner and the container lip. The resilient liner and inner foil seal are positioned above a retaining structure and function such that the peelable seal will not rotate relative to a container rim upon engaging the container rim as the closure is rotationally applied. This functions to inhibit torque transmission from the closure to the inner seal or reseal structure and further inhibits imperfections in the container rim from scraping or otherwise damaging the inner seal.

Abstract: A resealable barrier closure for a container with an open top and an annular snap ring below the open top. The closure includes a shell having an outer skirt dimensioned to telescope over the open top of the container. The outer skirt has a snap ring for engaging the snap ring on the container. The shell further includes an inner skirt to telescope into the open top of the container. An elastomeric diaphragm is sealingly engaged in the inner skirt. A barrier cup extends across the bottom face of the diaphragm and telescopes upwardly over the inner skin. The barrier cup initially is sealed hermetically to the container and to the plastic shell. The container may be opened by urging the plastic shell upwardly with sufficient force to break the seal between the barrier cup and the container. The container then may be resealed by merely urging the closure back over the open top of the container.

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 one-component seal and wadding system (1) for a screw-cap includes a seal (3) having lower layers (4,5) forming an induction heating sealable system for attaching the seal (3) to the neck of a container, a seal substrate (6) including a free tab (50) lying wholly within the circumference of the seal, a layer of liner (2), and attachment means (10,11,12) including a release layer (11) for attaching the seal substrate (7) including the tab (50) to the wadding (2).

Abstract: A snap-on plastic closure for a container includes a top wall portion, an annular skirt portion depending from the top wall portion, and a removal tab projecting forwardly from the skirt portion for manipulation of the closure during removal. A sealing plug depends from the inside surface of the top wall portion for disposition generally within the mouth of an associated container. The skirt portion of the closure includes a deformable region positioned beneath the removal tab so that during closure removal, the deformable region is permanently stretched and deformed for tamper-indication.

Abstract: A cap adapted to be secured on a neck of a container wherein the cap includes a top wall and a depending annular skirt having an inner annular projection. A fluid seal having a central transverse wall, an outer annular shoulder and a inner annular bead rests on the inner annular projection so as to define a space between the cap and the fluid seal into which the fluid seal is pushed when the cap is secured to the neck of the container to make a seal between the outer annular shoulder of the seal and the inner annular projection.

Abstract: A package made up of a container (30) with a closure assembly (10) applied thereto. The closure assembly has a molded plastic closure element (12) with a top panel (14) and an annular skirt (16) that depends downwardly from the top panel and surrounds and engages a finish of the container. The closure assembly (10) also has a barrier disc (20) that underlies the top panel, but is out of engagement with a rim (32) of the container (30) when the closure assembly is applied to the container. The closure element has an integral sealing fin (22) with an inner end (24) and an outer end (26), which, as molded, extends inwardly and downwardly from a distal end of the inner portion. When the closure assembly is applied to the container, the second portion of the sealing fin is folded back toward the inner portion of the sealing fin and engages the rim and a terminal side portion (34) of the finish of the container to form a top and side seal between the closure assembly (10) and the container (30).

Abstract: A closure cap (1) for a container consists essentially of a cap base (2), of a cap skirt (3) and of a sealing disk (5) which bears at least partly on the cap base (2). A circumferential bulge (6) is arranged in the transition region (7) between the cap base (2) and the cap skirt (3). The bulge (6) serves for pressing the sealing disk (5) onto the container opening. The bulge (6) is divided by interruptions (8) into several blocks (9). On the inner side (10) of the cap base (2) there is arranged at least one rib (11) running radially outwards. The, rib seen in the circumferential direction, is located neighboring one of the interruptions.

Abstract: A closure for a container consists of a top wall with an annular skirt depending therefrom and extending downwardly to a terminating edge. An inner surface of the annular skirt has a retaining bead in an upper portion of the inner wall. If threads are to used on a finished closure, then such threads, as desired, replace the retaining bead. Additionally, the top wall has a flexible annular ring formed axially along an inner surface and depending downwardly therefrom and spaced inwardly of the skirt. A sealing disc is disposed above the retaining bead and below the flexible annular ring. The flexible annular ring has a diameter larger than the inner diameter of the retaining bead. Furthermore, the flexible annular ring is the same diameter as a container rim of a container to be sealed by the closure of the present invention. Another preferred closure substitutes a glue post mounted along an inner surface of the top wall for the retaining bead in order to attach the sealing disc to the inside of the closure.

Abstract: A closure for containers has a septum of elastomeric material which is self-resealing when punctured by a blunt ended tubular implement to access to the contents of the container. In one application the elastomeric closure is incorporated in a cap for a bottle or vial and is self-resealing after being punctured by a laboratory pipette.

Abstract: The invention relates to a liner for use with an associated closure of an associated container. The liner comprises a central portion that has a periphery. The periphery defines a central portion diameter. At lest six tabs extend from the periphery, and each tab has a tab height. Each of the at least six tabs is about 20° to about 40° in arcuate length, and the tab height is about 1 percent to about 3 percent of the central portion diameter. Each of the six tabs is equally spaced from one another.

Abstract: A resealable barrier closure is provided for a container with an open top and an annular snap ring below the open top. The closure includes a shell having an outer skirt dimensioned to telescope over the open top of the container. The outer skirt has a snap ring for engaging the snap ring on the container. The shell further includes an inner skirt to telescope into the open top of the container. An elastomeric diaphragm is sealingly engaged in the inner skirt. A barrier cup extends across the bottom face of the diaphragm and telescopes upwardly over the inner skirt. The barrier cup initially is sealed hermetically to the container and to the plastic shell. The container may be opened by urging the plastic shell upwardly with sufficient force to break the seal between the barrier cup and the container. The container then may be resealed by merely urging the closure back over the open top of the container.

Abstract: A closure for containers has a septum of elastomeric material which is self-resealing when punctured by a blunt ended tubular implement for access to the contents of the container. In one application the elastomeric closure is incorporated in a twist-off cap for a bottle or vial and is self-resealing after being punctured by a laboratory pipette.

Abstract: A device for sealing a syringe in which a cartridge is inserted, the cartridge being closed at its top end by a flexible membrane and being connected to an injection needle of a needle-carrier part presenting a crown between the needle and the top surface of the cartridge so as to bear against the membrane to press the membrane inwardly just inside the edge of the orifice in the top surface of the cartridge and sealing the membrane to the top surface along the edge.

Abstract: The present invention relates to closure systems (10) for a container for pourable material in particular for pourable material for human consumption such as beverages. In particular the closure system (10)relates to a beverage bottle having a screw cap closure system. The closure system comprises a closure frame (20) providing the physical stability and and protection of the closure system (10) and a sealing means (30) which is removably joined to the closure frame (20) to provide appropriate sealing of the container. The present invention allows to recycle or reuse the closure frame (20) and to recycle the sealing means (30).

Abstract: A container mouth (21) is sealed with an inner seal which comprises a reseal liner (9) fitted inside of a cap (23) and a seal cover (10) separably laminated to the reseal liner and remaining on the container mouth after the container (20) is uncapped. The seal cover comprises a metal foil (5), a glassine paper (7) layered on the underside of the metal foil, and a hot-melt adhesive layer (8) coated on the underside of the glassine paper by gravure roll coating process. A polyethlene film (6) is preferably layered between the metal foil and the glassine paper to provide a better peel-off strength therebetween. The glassine paper may be replaced with an easy-peelable plastic film, such as a PET (polyethlene terephthalate resin) film. The inner seal fitted in the cap is placed onto the container mouth, and then the cap is subjected to a high frequency of 20-600 KHz to melt the hot-melt adhesive layer, whereby the seal cover hermetically seals the container mouth.

Abstract: A composite closure for a container has an outer band with a partial toroidal hook that overhangs a crown around the periphery of an insert cover disk. As the closure is tightened on the container, the hook bears downwardly on the crown of the disk and urges the disk against the container rim. The hook has several vents formed on its underside to enable air communication. A lower, inner edge of the hook is spaced apart from the disk to provide communication with the vents from the environment. An annular recess is formed on the underside of the hook, and is in communication with the vents and with a gap formed between an outboard wall of the crown and an inboard sidewall of the hook. A retaining bead is formed on a skirt below the hook to retain the disk. The bead is spaced apart from the disk when the closure is assembly to a container to enable communication from the environment through the vents to the threads.

Abstract: A composite closure for a container has a moulded plastics band (24) closed at one end by a plastics sure disc (72) which is held captive within a recess formed around the band interior. Also on the band interior is a screw thread (44) by which the closure may attached to a container neck (12). The disc is cut from flat plastics sheet and is initially plane. However, when the closure is fitted to the container a marginal edge region 78 surrounding the container neck is deformed downwardly to generally frustoconical form.

Abstract: A container assembly includes a container and a closure that has plural vents formed proximate its top member, preferably at a transition between the top member and the skirt. The closure includes a feature that spaces apart an edge of a liner, outside of which the vents are formed, and provides tamper protection. The closure and the container neck form a top and corner seal therebetween while the closure is in a fully closed position, and provide a gap when the closure is in a vented position. P gases within the container escape through the gap and the vents when the closure is unthreaded from the fully closed to the vented position. The vents may be configured such that the vent outlet is oriented substantially vertically to vertically direct the outbound gases to prevent closure blow-off and to avoid impinging against a user's hand.

Abstract: The present invention relates to closure systems (10) for a container for pourable material in particular for pourable material for human consumption such as beverages. The closure system (10) comprises a closure frame (20) and a sealing means (30) which is removably joined to the closure frame to provide appropriate sealing of the container. The present invention allows to reuse the closure frame and provides a temper proof indication.

Abstract: A plastic closure has a gas impermeable barrier member co-extruded with and substantially fully embedded within the cap so that the barrier member is mechanically captured within the molded cap. The substantially fully embedded barrier member extends at least across the end wall and can also extend circumferentially within and at least partially axially down the skirt from the end wall.

Abstract: The present invention provides containers and container caps for salad dressings, ketchup, barbecue sauces and other dispensable contents, which have liners which indicate whether or not the containers have been tampered with, and which may be removed by the user without the use a knife or similar tool.

Abstract: A container for liquid medical specimens such as urine specimens includes a container with a wide mouth opening for facilitating deposition of a urine sample, a removable cap for closing the mouth opening and an impermeable sheet liner under the cap for making a fluid tight seal with the rim. The liner is rupturable with the blunt tip of a laboratory pipette inserted through a small hole in the cap for drawing a sample of a urine specimen without removing the cap of the container. The hole in the cap may remain open after collection of a urine specimen in the container, as leakage is prevented by the liner. Alternatively, a small secondary cap may close the hole in the main cap. An optional decanter may be inserted through the hole in the cap for piercing the liner to facilitate pouring of the contents without removing the cap. A method of using the novel container for conveying a liquid medical specimen from a specimen collection site to a geographically removed laboratory site is disclosed.

Abstract: A sealing arrangement is provided having a container neck having a sloped land surface. The sloping land surface is configured to prevent the liner from slipping across the land surface when the cap is applied to the container. The cap has depending downwardly from its inner surface an annular bead positioned relative to the land surface such that, when the cap is applied to the container, the bead extends down into the mouth of the container radially inwardly of the land surface. The land surface, together with the bead, stabilize and stretch the liner upon application of the cap, urging the liner to conform to the land surface. At least one sealing rib depends downwardly from the lower surface of the cap to provide additional sealing force between the liner and the land surface.

Abstract: A self-resealing container cap configured to make a closing engagement with a container and a septum of elastomeric material supported in an opening defined by the cap periphery. The septum is puncturable by a blunt tip of an instrument such as a disposable plastic pipetter tip or a single use plastic laboratory transfer pipette having a tip width substantially greater than the thickness of a central portion of the septum. The septum is further configured to be substantially self-resealing against significant leakage of specimen liquid through the septum following withdrawal of the blunt tip from the punctured septum.

Abstract: A dental implant package for supplying a dental implant and healing screw without impacting the sterility thereof is disclosed. The package comprises an elongated tubular housing with an open first end and a closed second end for receiving the dental implant and a cap for closing the tubular housing. The cap has a retainer therein for holding a healing screw and is constructed and arranged so that the cap in the fully open position presents the healing screw and dental implant side-by-side.

Abstract: A pilfer-proof cap made of synthetic resins capable of preventing at least a rotation of a packing together with a cap in a simple construction when said cap is removed and holding a sealed-up tightness of a container until a bridge is broken is provided.A cap, in which a top wall and a skirt depending from said top wall are comprised and a threaded portion of the cap screwed in a threaded portion of the container is provided, a plurality of bridges, a packing provided so as to seal up tightly a mouth portion of container during the time when said cap is closed, a packing guide, a circular inner sealing member tightly insertable into an inner surface of said mouth portion of container provided in said packing and an air reservoir formed in an upper surface of the packing are comprised.

Abstract: A cap assembly for sealing a spout of a container, the cap assembly comprising:a) a cap including:1) a top wall formed with a plurality of vertical holes; and2) a skirt that is suspended from the top wall so that the vertical holes in the top wall form respective shelves extending laterally near a boundary region between the top wall and the skirt; andb) a gasket that is mounted on an inner side of the top wall, the gasket having:1) a body adapted to seal the spout of the container; and2) a plurality of ears, the ears extending laterally outward from the body, spaced from each other along a circumference of the body, corresponding to the respective vertical holes in the top wall, and supported by the respective shelves.

Abstract: A liner for use with a threaded closure cap is formed of a relatively thin, flexible material having a central portion configured for placement in the cap abutting a top wall thereof. The liner has at least one tab extending therefrom. The tab has a leading edge portion that is formed so as to define an angle relative to a tangent line adjacent to a juncture of the tab and the central portion. The angle of the tab is configured to be the same as the angle of the threads in the closure cap so that the tab rests fully against the threads prior to application of the closure to an associated container.

Abstract: A plastic beverage closure including a base wall, a peripheral skirt and a plurality of threads on the inner surface of the skirt for engagement with the threads of a container which may be made of glass or plastic. The plastic closure includes a compression molded seal extending about the periphery of the inner surface of the base wall and the juncture of the base wall to the peripheral skirt. The closure includes a central axially thickened portion; a channel surrounding the thickened portion and extending radially to an annular radially thickened portion on the skirt at the juncture with the base wall. A concave surface extends from the base of the channel and merges with the surface of the annular portion. A compression molded liner is provided on the thickened portion, channel and concave surface of the closure and defines a planar sealing surface of contact with the end surface of the finish of a container and an arcuate surface for engaging the arcuate surface of a container.

Abstract: A tamper-evident, snap-on, screw-off closure which is used with a specially shaped container neck is provided with a foil liner. Once the closure is applied to the neck, the foil liner is sealed to the neck of the container. The foil liner includes a tab for removal of the seal disc from the neck. The closure is characterized by the absence of a second liner between the top of the cap and the foil liner. The closure, neck and the foil liner are formed to inhibit adherence of the tab to the cap interior and the neck exterior.

Abstract: A bottle cap with a gas barrier seal for use in combination with the screw threaded neck of a carbonated beverage container and the like, having a body formed with an annular skirt and an end wall and a relatively stiff, high gas barrier, circular seal having a diameter greater than the outside diameter of the neck of the container where the seal is inserted adjacent the end wall into the cap body which includes a frusto-conical bead clamping element having a cone angle equal to or less than 90.degree. and an annular rib to prevent lateral displacement of the circular seal.

Abstract: A closure for the bottle having a cap-like closure part with an inward projection at its edge for clasping an outward projection on the neck of the bottle or the like. In the area of the face edge of the bottle neck the interior of the closure has a sealing surface for seating on the end face of a bottle neck. The sealing surface (5) has a sealing surface part (8) which is formed on the radial inner side of a projection directed away from the base of the closure part axially and clasping around the bottle neck and which is sloped radially toward the interior and axially counter to the screwing direction. The sloping sealing surface part (8) ensures the centering of the seal, improves the sealing effect, and contributes to the opening of the overpressure valve thereby formed, the opening pressure of which can be influenced through the selection of the degree of slope of the sealing surface part (8).

Abstract: A container cap having a base portion, a substantially cylindrical portion extending perpendicularly from a perimeter of the base portion to define an inner surface of the container cap, and an uncovered liner disposed directly on the inner surface of the container cap, the liner having an oxygen absorbent dispersed therein. The container cap is adapted to seal an opening in a container and to absorb oxygen within the container. Also disclosed is a method for removing oxygen from a container by dispersing an oxygen absorbent in a liner, attaching the uncovered liner directly to an inner surface of a container cap without a separate adhesive, and placing the cap over an opening in the container such that the liner in the container cap seals the opening and absorbs oxygen within the container.

Abstract: A venting closure for use with an associated container includes a closure cap having a circular top wall portion and a depending annular skirt portion. The closure is used with a pressurized container having a threaded neck portion defining a land surface at the top thereof. The closure includes a liner therein adjacent and in spaced relation to the top wall, which liner is positioned between the top wall portion and the land surface and defines a pressure release region with the top wall portion. The top wall portion includes an outwardly extending annular bead-like protecting element having a depending inner wall and a contiguous outer wall. The inner wall is oriented generally transverse to a top wall plane. A flexible portion having a piercing element extending inwardly therefrom toward the liner is positioned centrally of the annular protecting bead and is movable so that piercing element contacts and fractures the liner to release pressure from the container.

Abstract: There is proposed a plastic closure which serves to close a container (3) with a mouth region (5). The closure (1) has a lid (7) allocated to the container mouth (5) and an annular side wall (9) connected with this. On the inner surface (15) of the side wall (9) there are provided fastening means (16) which coact with corresponding fastening means (14) on the outer surface (11) of the container (3) and are constructed, for example, as screw threads. The closure has, finally, also a sealing means. It is distinguished in that the sealing means (11) has a circumferential pivotable sealing lip (9) projecting from a support (15), which lip coacts with a side wall (25) surrounding the container mouth (21) of the container (19), which in the closing of the container is swung out of a rest position into a sealing position and which in its sealing position is clamped between support and side wall of the container so that it is subjected to a compression.

Abstract: Potable liquid containers including a container, container closure and a closure liner, where the closure liner is formed from a polymeric heterogeneous blend of unvulcanized and uncrosslinked butyl rubber and a thermoplastic polymer are described. The closure liners are used for containers with closures such as a twist crown, a crown cork or a screw cap, for bottles, jars and the like, and more specifically for beer, juice and soft-drink bottles with closures made of metal or plastics.

Abstract: A cap for a container having a body and a closure. The body has a side wall and an adjoining top. The Side wall has means to let gases escape from the container to ambient. The top has an interior and at least one recess on the interior. The body further has a a line juxtaposed to the interior of the top. The interior and the liner are pierced by a hole through which a tubular part extends from the body. The sealing means maintains the liner pressed against the interior of the top in a leak-tight manner. The closure is a flip-top cap.

Abstract: A sealing member for a container has a membrane, e.g., aluminum foil, and a first sheet, e.g. polyester, part of which is bonded to the membrane. The other part of the sheet is free, so as to form a tab having one of a number of possible profiles, to enable the sealing member to be detached as a single unit. At least part of the periphery of the tab is within the periphery of the membrane, to facilitate grasping of the tab. The first sheet and the membrane or foil may have a common periphery where they are bonded together.

Abstract: A plastic beverage closure comprising a base wall, a peripheral skirt and a plurality of threads on the inner surface of the skirt for engagement with the threads of a container which may be made of glass or plastic. The plastic closure includes a compression molded seal extending about the periphery of the inner surface of the base wall and the juncture of the base wall to the peripheral skirt. The closure includes a central axially thickened portion; a channel surrounding the thickened portion and extending radially to an annular radially thickened portion on the skirt at the juncture with the base wall. A concave surface extends from the base of the channel and merges with the surface of the annular portion. A compression molded liner is provided on the thickened portion, channel and concave surface of the closure and defines a planar sealing surface of contact with the end surface of the finish of a container and an arcuate surface for engaging the arcuate surface of a container.

Abstract: A closure for a medical specimen test jar includes a threaded closure ring and a separate, connected but freely rotatable sealing gasket on the underside of the ring. An agar paddle is secured to the closure via the gasket at the inside of the closure ring, the gasket material being relatively rigid, and the connection with the agar paddle being such as to retain the agar paddle securely. A matrix of posts is included on each side of the agar paddle, and in the production of the paddle the posts and a perimeter rim around each side of the agar paddle are staked down by heat and pressure to form overhanging flanges on the posts and an undercut rim which serve to retain the flexible agar mass in place on the test paddle. At the center of the closure is a needle-penetrable septum for receiving injection of blood or other specimens.

Abstract: A sealing member for a container has a membrane, e.g. aluminum foil, and a first sheet, e.g. polyester, part of which is bonded to the membrane. The other part of the sheet is free, so as to form a tab, to enable the seal to be detached. The seal can be attached to the neck of a bottle by a hot melt adhesive. The sheet and membrane can be stamped from a compound sheet and be of the same size. The composite portion can extend up to a line extending across a major portion of the membrane, or in another embodiment it covers a major portion of the membrane. Alternatively, the first sheet and the membrane can have a substantially common periphery in the separated portion of the sealing member forming the tab. A further embodiment provides for a sealing member that is entirely planar.

Abstract: A cap (20) is provided with a sealing pad (31) made of good barrier material for the contents of a bottle on which the cap is engaged. The pad has annular projections (33, 34) which sealingly engage with the inner wall (13) and the rim (15) respectively of a mouth of the bottle. The pad is retained in the cap by a retaining ring (30) projecting radially inwardly from the skirt (22) of the cap and this ring engages the outer wall (14) of the mouth to provide a third seal between the cap and the bottle.

Abstract: A closure apparatus for a container includes an adapter which is mounted on or otherwise integrally formed with the container adjacent the container opening, and a cap which is moveable between an opened position and a closed position over the container opening. A coupling mechanism is provided for interconnecting the cap to the adapter so as to enable the cap to slide relative to the adapter between the opened and a closed position. A clamping mechanism, preferably provided by opposing ramped surfaces on the adapter and cap, is provided ton cooperate with the coupling means whereby the cap is urged into pressing engagement with the adapter over the container opening as the cap slides into the closed position.

Abstract: Opening device for a packaging container with an unbroken, liquid-tight pouring spout (31, 33) and a closure part (3) enclosing this. A method of manufacturing the opening device entails forming the pouring spout (21, 33) with the closure part (3) as a mould, with a heated, thermoplastic material layer being forced into the closure part through a pressure difference.

Abstract: A container closure having a multiple liner seal is disclosed. The closure comprises a plastic closure cap having a circular top wall portion and a depending annular skirt portion. The skirt portion has an internal thread formation for threadedly engaging a cooperative container. In a typical closure, a pilfer band depends from the skirt portion. The closure cap has an abutment internal thereto, generally at the juncture of the top wall portion and the skirt portion. A first resilient, molded-in plastic seal is positioned in the cap adjacent to and against the top wall portion, and a second resilient plastic seal is positioned in the closure and extends thereacross resting upon the abutment. When the closure is threadedly engaged with a container, the second seal provides a top/side seal to seal the contents from the environs. The closure will seal a container with or without the second seal in place because of the independent sealing capabilities of the first seal.

Abstract: A composite closure for a container has an outer ring with a half-toroidal lip which overhangs a bead around the periphery of an insert cover disk. As the closure is tightened on the container the lip bears downwardly on the bead of the disk and urges the disk against the container rim. Reaction force uncoils the lip like a watch spring, and a visible gap develops between the inner edge of the lip and the disk. This gap provides a visible on-line indicator that the lip is exerting sealing force on the disk. In a second aspect of the invention, a tamper-evidencing band on the closure has ratchets which engage angularly spaced groups of ratchets on the container. Unequal torque thereby acts on bridges which connect the tamper evidencing band to the closure, causing the bridges to break sequentially rather than simultaneously. As a result the bridges can be made stronger and premature breaking is reduced.

Abstract: A closure device for use with a container having an open neck finish, including an inner cap having a skirt terminating in an open end which engages the outside diameter of the finish. The inner cap is sized to initially engage the finish. The skirt has circumferentially spaced slits extending, which may function as lyophilization ports, which permit the inner cap to expand upon an axial closing force and engage the bottom of the finish. A liner is positioned in the inner cap proximate the closed end and is compressed against the finish when the cap is moved to alignment with the bottom of the finish. An outer cap is locked on to the inner cap in pre-assembly which then encloses the inner cap after complete assembly to seal and compress the liner between the finish and the inside face of the inner cap.

Abstract: A plastic closure cap of the present invention includes a plastic interior liner. The cap and the liner are bonded by melting them to one another without penetrating either the cap or the liner. The bond between the cap and the liner is extremely durable and resistant to solvent vapour action.