Abstract: A pilfer-proof plastic closure comprising a top panel wall and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall. The skirt wall has formed therein a circumferentially extending breakable line dividing the skirt wall into a main portion above the breakable line and a pilfer-proof bottom portion below it. The main portion has formed on its inner surface an internal thread and the pilfer-proof bottom portion has formed on its inner surface a plurality of radially inwardly projecting engaging flaps at circumferentially spaced positions. Each of said engaging flaps has a first portion extending from the inner surface of the pilfer-proof bottom portion tiltedly in a direction opposite to the direction of rotation of the closure at the time of mounting it on the mouth-neck portion of a container and a second portion bent with respect to the first portion and further extending from the end of the first portion. The first portion forms an angle .alpha.

Abstract: A plastic closure having pilfer-proofing characteristics for a container including a mouth-neck portion having formed on its peripheral surface an external thread and an annular flange located beneath it. The closure includes a top panel wall and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall. A breakable line extending circumferentially is formed on the skirt wall to divide the skirt wall into a main portion above the breakable line and a pilfer-proof bottom portion below it, and an internal thread adapted to be fitted with the external thread of the mouth-neck portion of the container is formed on the inner surface of the main portion of the skirt wall. The inner surface of the pilfer-proof bottom portion has formed therein at least one flap extending radially inwardly therefrom.

Abstract: Irregularities in a coating on a substrate in which the coating includes optical scattering centers can be detected by irradiating the coating with polarized light and examining light from the coating through a filter which removes light having the same polarization as the initial beam. Light scattered by the optical scattering centers is transmitted through the filter, while specularly reflected light from the top surface of the coating, from the substrate exposed by gaps in the coating, or reflected by alien material on the coating is filtered out. As a result irregularities can be detected as intensity minima of the transmitted radiation.

Abstract: Disclosed is a bottle for a carbonated drink, which is formed by biaxial draw-blow molding of a polyester containing a surface active agent and being composed mainly of ethylene terephthalate units, wherein at least the barrel wall portion of the bottle is molecularly oriented biaxially so that the density is at least 1.34 g/cm.sup.3 as measured at 20.degree. C., and the surface active agent is distributed in the surface of the barrel wall portion so that the contact angle of the surface of the barrel wall portion to water is not larger than 76.degree..In this bottle, the speed of transfer of carbon dioxide gas from the liquid phase of the drink to the gas phase at the time of opening the bottle is controlled to a very low level. Accordingly, occurrence of the cap missile phenomenon at the time of removing the cap from the bottle or reduction of the carbon dioxide content in the drink at the time of repeating sealing and opening of the bottle can effectively be prevented.

Abstract: A method for forming a liner of the desired shape in a container closure, and an apparatus for carrying out this method. The method involves extruding a liner stock in the heated and molten state into an annular shape by an extruder, positioning the annular liner stock at a predetermined location in a closure, and molding the annular liner stock positioned in the closure into the desired shape while it is still in the molten state.

Abstract: A container closure having a sealing liner comprising a vinyl chloride-type resin is provided which has excellent sealing properties, openability and hygienic characteristics. The liner is composed of a composition, especially a plastisol composition, comprising 100 parts by weight of the vinyl chloride-type resin and 35 to 200 parts by weight of a mixed fatty acid ester of glycerin derived from glycerin, at least one saturated or unsaturated fatty acid component having an even number of carbon atoms between 6 and 24 and at least one acetic or butyric acid component, such as a diacetyl higher fatty acid glyceride. A method for producing the container closure is also provided.

Abstract: An easily openable container closure comprising (1) a shell of a unitary structure including a top and a cylindrical skirt, said top having an annular top surface portion leading to the upper end of the skirt and a pull ring connected to a part of the inner peripheral edge of the annular top surface portion through a linking piece, and the annular top surface portion and the skirt having a pair of breaking weakened lines formed along the phantom lines extending from both side edges of the linking piece, and (2) a sealing member positioned within the shell for closing an opening present in the top surface of the shell. The annular top surface portion of the shell at least includes a first annular portion extending inwardly from the upper end of the skirt and a second annular portion extending downwardly and inwardly in an inclined manner from the first annular portion.

Abstract: A method of producing an easily openable container closure which has (1) a shell of with unitary structure including a top and cylindrical skirt, the top having an annular top surface portion leading to the upper end of the skirt and a pull ring connected to a part of the inner peripheral edge of the annular top surface portion by a linking piece, and the annular top surface portion and the skirt having a pair of breaking weakened lines extending from both side edges of the linking piece. A set of lance slits is formed in a metal blank, and a pair of weakening lines is formed spaced from each other at a predetermined distance in the circumferential direction and extending over a predetermined distance from near the lance slits toward the center of a circular portion located inwardly of the lance slits.

Abstract: Container closure having an easily openable liner, said liner being composed of a composition comprising a base resin consisting of 95 to 30% by weight of a crystalline polyolefin and 5 to 70% by weight of a lowly crystalline or amorphous copolymer of ethylene with otherolefin, a lubricant in an amount of 0.001 to 5% by weight based on said base resin and a polymer containing at least 10% by weight of a conjugated diene in an amount of 1 to 15% by weight based on said base resin. This closure has a good sealing property and an easy openability in combination.

Abstract: An easily openable container closure comprising (1) a shell of a unitary structure including a top and a cylindrical skirt, said top having an annular top surface portion leading to the upper end of the skirt and a pull ring connected to a part of the inner peripheral edge of the annular top surface portion through a linking piece, and the annular top surface portion and the skirt having a pair of breaking weakened lines formed along the phantom lines extending from both side edges of the linking piece, and (2) a sealing member positioned within the shell for closing an opening present in the top surface of the shell. The annular top surface portion of the shell at least includes a first annular portion extending inwardly from the upper end of the skirt and a second annular portion extending downwardly and inwardly in an inclined manner from the first annular portion.

Abstract: A closure for sales promotion comprising a closure shell having the indication of a prize offer on its inner bottom surface and a gasket bonded to its inner bottom surface, the gasket having a center panel portion held half-adhered or non-adhered to the inner bottom surface of the closure shell and a peripheral sealing portion firmly adhered to the inner bottom surface of the closure shell, the center panel portion being completely defined from the peripheral sealing portion by a breakable line so that the center panel portion can be stripped off from the inner bottom surface of the closure shell while leaving the peripheral sealing portion.

Abstract: A sales promoting-purpose closure comprising a closure shell having the indication of a prize offer on its inner bottom surface and a gasket peelably bonded to the inner bottom surface of the shell. The gasket either only partially adheres to the inner bottom surface of the closure shell at least at its center panel or not at all, and the center panel has a tear strip portion defined by a breakable line.

Abstract: A cap includes a metallic cap shell having a circular top and a skirt extending downwardly from the peripheral edge of the top and provided with a thread-forming portion deformable along the thread of the opening part of a container, and a flexible liner provided inwardly of the top of the cap shell. The liner includes an annular protrusion having an inside diameter substantially equal to, or slightly larger than, the outside diameter of the sealing surface of the opening of a container to be sealed and comprising a perpendicular inside wall adapted to seal intimately with the peripheral sealing surface of the container opening and an upright outside wall spaced apart from the inner circumferential surface of the skirt.

Abstract: A crown closure having a polyolefin liner that can be readily removed, said crown closure comprising a crown shell having a primer layer on its inner surface and a polyolefin liner applied to the inside of said crown shell, characterized in that said primer layer is a two-component priming consisting of an undercoat layer containing a polyethylene oxide and a topcoat layer containing a polyethylene oxide and at least one other compatible resin, with the provision of a printing layer of indicia at the interface between said undercoat and topcoat layers or atop said topcoat layer.

Abstract: An apparatus for dispensing predetermined amounts of lining material into cap shells, particularly of the deeply recessed type, includes a conveyor including a passage for conveying cap shells at predetermined speeds, an extruder provided above and along the shell-conveying passage for extruding predetermined quantities of a lining material through a discharge passage, a blade fitted adjacent to the exit end of the discharge passage and rotatably across it for cutting the lining material, and a drive for rotating the blade in response to the conveying of the cap shells. The drive is adapted to rotate the blade at a non-uniform speed in response to the speed of shell conveyance so that its speed gradually decreases as the exterior end of the blade in its radial direction approaches the shell-conveying passage, and gradually increases as it departs from it, whereby collision between the tip of the blade and the cap shells can be completely avoided.

Abstract: A crown closure having a polyolefin liner that can be readily removed, said crown closure comprising a crown shell having a primer layer on its inner surface and a polyolefin liner applied to the inside of said crown shell, characterized in that said primer layer is a two-component priming consisting of an undercoat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene .Iaddend.and a topcoat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene .Iaddend.and at least one other compatible resin, with the provision of a printing layer of indicia at the interface between said undercoat and topcoat layers or atop said topcoat layer. Aforesaid crown closure can be prepared by providing at one face of a metal stock sheet a primer undercoat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene.Iaddend., printing indicia thereon, providing atop said undercoat layer a primer topcoat layer containing .[.a polyethylene oxide.]. .Iadd.