초록 ▼

A screw cap for separation of a sealing film or foil that is sealingly attached to a rim of a neck of a container as the cap is removed from the container. The screw cap has a complementary thread to the thread on the neck of the container for installation of the cap on the neck. The screw cap can b

A screw cap for separation of a sealing film or foil that is sealingly attached to a rim of a neck of a container as the cap is removed from the container. The screw cap has a complementary thread to the thread on the neck of the container for installation of the cap on the neck. The screw cap can be unscrewed at any later point in time. When the screw cap is unscrewed from the neck, the cap includes a knife with an edge positioned to separate the sealing film from the rim 11 of the neck 3 by radially starting from the periphery of the rim and progressing inwardly.

대표청구항 ▼

1. A method for making a cap to engage a neck of a container having a rim with a circular sealing surface, the neck having a male thread and a center axis, and a sealing film or foil that is sealingly attached to the rim, and the cap having a female thread complementary to said male thread for screw

1. A method for making a cap to engage a neck of a container having a rim with a circular sealing surface, the neck having a male thread and a center axis, and a sealing film or foil that is sealingly attached to the rim, and the cap having a female thread complementary to said male thread for screwing down onto the neck for unscrewing at any later point in time, as desired, the method comprising the steps of configuring the cap including forming a detachment knife on the cap aligned from the periphery of the rim and progressing inwardly toward the center axis; and biasing said detachment knife radially to at least partially unseal the film or foil from said rim, and lifting said seal off from said rim, when said cap is unscrewed from said neck. 2. A method as defined in claim 1, and comprising: prior to the initial screwing of the screw cap onto the male thread of the neck, installing a reinforcement disk, coating one side facing the neck with an adhesive, said disk will be for pressing with its adhesive against the sealing film that is sealingly attached to the rim of the neck when the cap is subsequently screwed onto the neck, to form a surface-to-surface bonding of the reinforcement disk with the sealing film after the cap has been screwed down. 3. A method as defined in claim 2, comprising induction welding the reinforcement disk to the sealing film, a thermoplastic compound being used as adhesive. 4. A method as defined in claim 2, and comprising reinforcing the sealing film on the neck before installing into the screw cap by a surface-to-surface bonded reinforcement disk, or a sealing film that has been stiffened or is resistant to bending. 5. A method as defined in claim 2, comprising using a glue, lamination, or sealing wax composed of substantially PE, PET, polyester, or polystyrene, or a combination of these substances, as an adhesive on the surface of said reinforcement disk facing the sealing film. 6. A screw cap having a top section, a sleeve section having a female thread, and an open end, that enable screwing of the cap onto, and unscrewing from, a container neck having a rim and a male thread, which neck is hermetically sealed by a sealing film which has a radially overlapping circumferential zone engaging the rim and which is sealingly attached to a circular sealing surface of the rim of the neck, and which is detached and/or destroyed in order to expose the contents of a bottle; the cap comprising: at least one detachment knife disposed on the sleeve section between the female thread and the top section and extending along an inside periphery of the sleeve section in its starting position prior to being screwed down, the at least one detachment knife having a knife edge extending obliquely toward the open end of the screw cap and inwardly toward the center axis of the neck and the screw cap, wherein the distance of the detachment knife edge from the center axis prior to screwing down is less than an outside diameter (D) of the rim of the neck,the at least one detachment knife being resiliently displaced as the screw cap is screwed down onto the neck of the container, and, due to the pressure imposed by the rim of the neck and the circumferential zone of the sealing film, the detachment knife resiliently bends the knife edge upwardly and comes to rest on an outer periphery of the neck above the male thread and beneath the radially-overlapping circumferential zone of the sealing film, and the at least one detachment knife being resiliently deformed and resiliently pre-stressed toward the center axis once the cap is screwed down, andwherein when the cap is unscrewed, the knife edge of the detachment knife is disposed initially obliquely in relation to the sealing film and toward the center axis, and then, due to its resiliency by springing back, continuously penetrates further radially inwardly toward the center axis between the overlapping circumferential zone of the sealing film and the rim of the neck of the bottle, wherein the sealing film is engaged by the knife edge to be progressively separated from the rim of the bottle toward the center axis and to be stored in the screw cap between the detachment knife and the top section. 7. A screw cap as defined in claim 6 wherein said at least one detachment knife comprises a plurality of individual detachment knives fixed to the sleeve section and distributed around the inside periphery of the sleeve section in a circumferential direction (A), the knives being disposed radially about the center axis in a common plane to leave a clearance (W) in a zone of the center axis which has a smaller diameter than that of the circular sealing surface of the rim of the neck of the container. 8. A screw cap as defined in claim 6 and comprising each knife edge partially extends in the circumferential unscrewing direction (A). 9. A screw cap as defined in claim 8 and comprising each knife edge is concavely curved and has a radially projecting, pointed cutting projection trailing in the circumferential, unscrewing direction (A). 10. A screw cap as defined in claim 6 and comprising at least one circular pressure lip formed on an inside surface of the top section of the screw cap, disposed about the center axis opposite to the circumferential zone of the sealing film to press the circumferential zone of the sealing film onto the rim of the neck and nestles thereon as the screw cap is screwed down. 11. A screw cap as defined in claim 6, and comprising the at least one detachment knife configured to extend around the inside periphery of the sleeve section in the form of an annular knife. 12. A method for making a cap for the neck of a container, a rim of the neck having a sealing film on the rim surface and the neck having a male thread and a center axis, and the cap having a female thread complementary to the male thread and capable of being screwed down onto the male thread of the neck and unscrewed at any later point in time, the method comprising: providing a detacher before the screw cap is screwed down onto the neck of the container, for unsealing at least part of the film or foil from said rim;installing an intermediate layer for being pressed onto the sealing film by an inside surface of a top section of the cap as the screw cap is screwed down onto the neck of the container,adhering said intermediate layer to the inside surface; andadhering by gluing or welding to a surface of the sealing film in such away that the sealing film firmly adheres to the inside surface for at least partially detaching the sealing film by the intermediate layer adhered in the screw cap when the cap is unscrewed from the neck of the container. 13. A method as defined in claim 12 and comprising forming points, embossments or perforations configured as breaking points in the sealing film in a circumferential direction within a clearance of the neck, and the adhering the intermediate layer to the inside surface of the top section in a region of the surface surrounded by said embossments or perforations. 14. A method as defined in claim 13, wherein said installing an intermediate layer comprises installing a disk consisting of at least two layers as the sealing film, wherein the layer facing the inside surface of the top section is composed substantially of PE, PET, or aluminum and the layer facing the neck is composed substantially of PE, PET, or sealing wax, or a combination of the aforementioned substances. 15. A method as defined in 13, comprising adhering only the intermediate layer to the sealing film facing the inside surface of the top section within embossment or perforations within the clearance of the neck. 16. A method as defined in claim 13 wherein said forming comprises shaping points, an embossment or perforation as a complete circle. 17. A screw cap for a container having a neck with a male thread, and a sealing film that is sealingly attached to a circular sealing surface of a rim of the neck, the cap having a top section and a sleeve section having a female thread corresponding to the male thread and an open end for screwing onto, and unscrewing from, the neck, the cap comprising: means for removing at least a portion of the sealing film having a detacher in the form of an inverted, anvil-like, inner, plate-like projection facing an inside surface of the top;an intermediate layer under the anvil-like projection;a first adherent to engage the inside surface; andhaving a second adherent to bear against the surface of the sealing film when the screw cap is screwed down. 18. A screw cap as defined in claim 17, comprising the container being composed of plastics material or glass or the like. 19. A screw cap as defined in claim 17, comprising the sealing film is made of aluminum and/or plastics material. 20. A screw cap as defined in claim 17 comprising the cap being composed of plastics material. 21. A screw cap as defined in claim 6 comprising the sleeve section having a degree of lift between the screw cap and the neck given a thread pitch of the male thread and the female thread from the fully screwed-down position of the screw cap on the container, is at least equal to the detachment knife having a length at least equal to the radial distance between the inside periphery of the sleeve section and an inside periphery of the rim. 22. A screw cap as defined in claim 21, comprising the detachment knife length being greater than the radial distance between the circular sealing surface of the rim of the neck and the inside periphery of the sleeve section. 23. A screw cap as defined in claim 21 comprising the thread pitch and the thread mating are dimensioned in such a way that each 360° turn of the screw cap raises the screw cap approximately 9 mm from the neck. 24. A screw cap as defined in claim 21 comprising the female thread is configured as a triple thread. 25. A screw cap as defined in claim 21 comprising the at least one detachment knife being disposed on the inside periphery of the sleeve section above the female thread toward the top section, and the thread path of the female thread has gaps, the width of the gap being substantially equal to, or slightly greater than, the width of each at least one detachment knife in the circumferential direction of the inside periphery, wherein when the screw cap is removed upwardly from a mold, the at least one detachment knife can be pressed downwardly into the gaps and remain briefly therein until they emerge from the mold and are exposed. 26. A screw cap as defined in claim 21 comprising the at least one detachment knife having a free end provided with a knife edge, the free end being curved or bent toward the rim when the circular sealing is penetrated between the sealing film and the rim. 27. A screw cap as defined in claim 26, comprising the free end of the at least one detachment knife being curved on both sides in such a way that it has a spoon-like, concave curvature. 28. A screw cap as defined in claim 27 comprising a counter-pressure lip in the form of an annulus is provided on the inside of the top section between at least one concentrically disposed pressure lip and the inside surface of the sleeve section.