CN104540661A - 带有可剥离的盖子的金属罐 - Google Patents

带有可剥离的盖子的金属罐 Download PDF

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CN104540661A
CN104540661A CN201380042162.5A CN201380042162A CN104540661A CN 104540661 A CN104540661 A CN 104540661A CN 201380042162 A CN201380042162 A CN 201380042162A CN 104540661 A CN104540661 A CN 104540661A
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flange
sealing
lid
strippable
metal
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CN104540661B (zh
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F·C·G·孔布
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Crown Packaging Technology Inc
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Crown Cork and Seal Technologies Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
    • B65B7/2842—Securing closures on containers
    • B65B7/2878—Securing closures on containers by heat-sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D43/00—Lids or covers for rigid or semi-rigid containers
    • B65D43/02—Removable lids or covers
    • B65D43/0202—Removable lids or covers without integral tamper element
    • B65D43/0233—Removable lids or covers without integral tamper element secured by rolling or other plastic deformation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/12—Cans, casks, barrels, or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/40—Details of walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81417—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled being V-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/717—Cans, tins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
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    • B65D2543/00—Lids or covers essentially for box-like containers
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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Closures For Containers (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Packages (AREA)

Abstract

一种将可剥离的盖子密封至形成在管状的金属罐主体中的周向的并且向内突出的凸缘的方法，其中，所述凸缘具有密封表面，该密封表面具有大体上V形的轮廓。所述方法包括如下步骤：利用冲压器抵着凸缘的密封表面按压可剥离的盖子，所述冲压器的接合表面具有大体上V形的轮廓，从而使得冲压器的尖端将所述可剥离的盖子按压进入所述凸缘的密封表面的凹处。

Description

带有可剥离的盖子的金属罐
技术领域
本发明涉及一种带有可剥离的盖子的金属罐，特别地，本发明提供这样一种金属罐，该金属罐具有凸缘以便提供用于将带有可剥离的盖子的罐进行密封的表面。
背景技术
罐典型地为两片式或者三片式的罐。在两片式的罐的情况下，罐主体通过冲压金属板而形成，以便形成一端封闭的圆筒。一旦罐被装满，开口端然后典型地通过将盖子接合至罐主体而被封闭。在三片式的罐的情况下，两端开口的罐主体通过将金属板卷成筒状并且接合而形成。第一端典型地通过将盖子接合至罐主体而被封闭。一旦罐被装满，第二端典型地通过将盖子接合至罐主体而被封闭。
FR2639561公开了一种金属罐以及制造该金属罐的方法，该金属罐包括内部环形凸缘，可剥离的盖子能够被热密封至该凸缘以便将罐的内部空间严密地密封。可剥离的盖子具有热密封层，该热密封层用于将盖子密封地结合至凸缘。一种可选择的热密封方法可以包含如下步骤：在凸缘的上表面周围和/或在可剥离的盖子的下表面周围提供粘合剂，将凸缘加热并且施加向下的压力。
对于一些市场，在FR2639561中描述的金属罐的类型可以完全地满足需要。然而，对于更加专业的市场，例如婴幼儿配方食品市场(即，用于储存婴儿奶粉的金属罐)，其所需要的密封部即使在最恶劣的环境中也具有非常高的性能，这些熟知的罐可能并不适合。
在引进至该市场之前，这种专门的金属罐需要经过一系列严格的测试以便确保它们满足必需的安全要求。例如，金属罐可以被测试以便确保即使当在高环境温度(例如45℃)下储存超过3个月的时间并且从罐内至罐外具有压力差(例如700mbar，即70kPa)时，罐的严密的密封仍然不失效。典型地外部压力为标准(环境)气压并且内部压力为负的，通常称为“真空”。在这样的条件下，已经发现按照现有技术所描述的制造的金属罐容易在密封中经受“蠕变(creep)”。蠕变为可剥离的盖子被向内拉为越过凸缘的趋势。这会降低可剥离的盖子与凸缘之间的密封的效果，并且在某些情况下可能引起密封完全失效。由于该密封被认为没有将产品密封至足够高的标准，所以以此方式经受蠕变的金属罐不能被用于婴幼儿配方食品市场。
发明内容
本发明的目的为克服或者至少缓解上述讨论的由带有凸缘的金属罐与可剥离的盖子之间的密封中的蠕变造成的问题。
根据本发明的第一实施方案，提供一种将可剥离的盖子密封至形成在管状的金属罐主体中的周向的并且向内突出的凸缘的方法，其中，所述凸缘具有密封表面，该密封表面具有大体上V形的轮廓，所述方法包括如下步骤：利用冲压器抵着凸缘的密封表面按压可剥离的盖子，所述冲压器的接合表面具有大体上V形的轮廓，从而使得冲压器的尖端将所述可剥离的盖子按压进入所述凸缘的密封表面的凹处。
随着所述可剥离的盖子抵着所述凸缘的密封表面被按压，热可以被施加至可剥离的盖子和/或所述凸缘。
本发明的实施方案提供一种改进的能够提供极好的严密的密封的金属罐。
优选地，所述利用冲压器抵着所述凸缘的密封表面按压可剥离的盖子的步骤大体上消除来自可剥离的盖子与凸缘的密封表面之间的气穴。
附图说明
图1显示了现有技术中目前被熟知的带有凸缘的罐的侧壁的部分的截面；
图2显示了根据本发明的实施方案的在密封操作的第一阶段的侧壁和带有大体上V形的接合表面的冲压器的部分的截面；
图3显示了在第二阶段的密封操作；
图4显示了在第三阶段的密封操作；
图5显示了在第四阶段的密封操作；
图6显示了带有凸缘的金属罐主体以及利用图2至图5的方法密封至凸缘的可剥离的盖子的截面视图；以及
图7为根据本发明的实施方案的金属罐主体的立体图。
具体实施方式
如下论述涉及金属罐，该金属罐设置有将所述罐严密地密封的可剥离的盖子，该盖子能够被揭开并且去除以便将罐打开并且提供通向其中所储存的容纳物的入口。金属罐可以为两片式的罐或者三片式的罐。
如上所述，熟知的设置有凸缘以便用可剥离的盖子密封的金属罐常常不能被密封为足够高的标准以便通过某些高规格产品(尤其是婴幼儿配方奶粉)所需的严格的测试。
图1显示了金属罐的侧壁2的部分的截面，该金属罐具有诸如现有技术中熟知的凸缘1。凸缘的上表面没有提供可剥离的盖子能够在其上密封的完美平坦的表面。测试显示在此类型的凸缘上获得完全平坦的上表面是非常困难的，并且典型地凸缘的上表面采取带有两个径向方向上的内部部分和外部部分(3和4)的大体上“V形”的轮廓，所述两个径向方向上的内部部分和外部部分***超过处于更低的平面(B’)的在它们之间的区域。当凸缘的初始的圆顶形上表面在中间部位(N和B’)向下弯曲时，此轮廓产生。
水平的虚线A表明在典型的密封过程期间，当可剥离的盖子利用平坦的冲压器从上方被放置在凸缘的上表面上时，事实上它只密封至在位置3和4处的凸缘的上表面。在箭头B和B’之间存在显著的“凹槽”，在该凹槽中空气会被存留在3和4处的两个密封部分之间，从而阻止此区域被适当地密封。因此，在可剥离的盖子与凸缘之间的整个密封区域中存在实质的削弱，这极大地减弱了剪切模式中的密封并且加大了密封经受蠕变的可能性。
将可剥离的盖子密封至包含向内突出的凸缘的金属罐的方法参考图3至图5现在将被描述，其能够使大体上连续的密封的构造跨过凸缘的径向方向上的长度以便获得更稳固的密封。这通过利用下述的冲压器而得到促进，该冲压器具有大体上V形的轮廓的接合表面以便抵着凸缘密封表面按压可剥离的盖子。冲压器的大体上V形的接合表面将可剥离的盖子与凸缘的上表面之间的存留空气的“气穴(pockets)”的尺寸减小甚至将其消除。
图2显示在金属罐的侧壁2的部分的截面以及在密封操作开始的时候的冲压器10，在密封操作中可剥离的盖子12被“冲压”到位。冲压器10具有大体上V形的接合表面11，该接合表面11与凸缘1的密封表面的大体上V形的轮廓基本一致。(可以理解的是，用于***罐主体中的冲压器10为大体上环形形状的，从而使得在使用中其围绕罐主体的内部圆周延伸用于与凸缘接合。)
在热密封过程期间，冲压器10利用力F将可剥离的盖子12向下按压在凸缘1上。密封初始地形成在点P处的凸缘1的径向方向上的长度的中间，在点P处冲压器10的尖端将可剥离的盖子12按压进入凸缘1的接合表面的凹槽中。然后，如图3所示，由于冲压器被向下按压在凸缘上，可剥离的盖子12采取冲压器10的V形的轮廓，密封形成在可剥离的盖子12与凸缘1之间。
密封利用位于可剥离的盖子与凸缘的凸起的上表面之间的热密封材料(例如热塑性材料)而制造。在完全的密封被制造为大体上跨过凸缘的整个径向方向上的长度之前，冲压器10的接合表面的V形的轮廓使得否则将被存留的任何空气从可剥离的盖子与每侧的凸缘的密封表面之间逸出。
如图4所示，凸缘的密封表面的形状还可以通过冲压器10所施加的压力而改变。这能够进一步地减少可剥离的盖子与凸缘的密封表面之间的非密封区域的长度。
图5显示了在可剥离的盖子12已经被热密封至凸缘1的密封表面并且冲压器10被撤走之后金属罐2的壁的截面。箭头S显示在凸缘的大部分径向方向上的长度上面形成的密封的实质上没有中断的宽度。
图6显示了储存奶粉16的金属罐15的截面。金属罐具有形成在罐壁2中的凸缘1。凸缘1提供密封表面，利用具有大体上V形的轮廓的接合表面的冲压器而使可剥离的盖子12已经被热密封至所述密封表面。可剥离的盖子12可以包含拉环，或者类似的结构，从而使得消费者通过将可剥离的盖子从凸缘揭开而能够更加容易地将其去除。罐设置有不可去除的基部或者“罐底部”17，其将在罐底端的开口密封。虽然在图6中没有示出，但是罐可以进一步地设置有可移除的塑料顶盖，该塑料顶盖放置在罐的顶端的开口上面。一旦密封已经被打破并且可剥离的盖子被移除，此塑料顶盖能够将罐再次封闭。
凸缘1在图6中显示为接近金属罐的开口端。然而凸缘可以形成在罐壁往下一点的位置，因此能够使密封将罐分隔为两个不同的部分。例如，被可剥离的盖子严密地密封的下部分可以容纳婴幼儿配方奶粉，上部分可以容纳勺状物或者匙状物。另外的凸缘可以设置为接近罐的顶部以便密封容纳有勺状物的罐的部分，从而确保在消费者打开和使用其之前其保持在无菌的环境中。
还可以在管状的罐主体(具有焊接的侧焊缝)的两个开口端部处形成凸缘，并且分别用可剥离的盖子封闭两端。
在用于例如本文描述的罐制造过程的期间，罐制造商可以制造在合适的位置带有可剥离的盖子但是在底端处于开口状态的管状的金属罐。带有分离的底端以及塑料顶盖的罐将然后被送至制造商的客户。然后，客户能够在通过将不可移除的罐底部接合在合适的位置而将罐密封之前通过开口的底部将产品填入罐。然后，塑料顶盖可以被放置在可剥离的盖子的上方的罐的顶端上。如果需要，在塑料顶盖被放在合适的位置之前，匙状物或者勺状物可以被放置在罐中可剥离的盖子的顶部。
图7显示了来自如上的金属罐15的立体图。此视图显示出凸缘1形成在罐壁2全长的部分下方的罐壁2中，并且凸缘围绕金属罐15的整个内圆周延伸。
应当清楚本领域技术人员可以对上述实施方案进行各种修改而不背离本发明的范围。例如，可剥离的盖子可以为塑料材料或者可以为包括陶瓷层(例如硅或者氧化铝而不是金属)的多层结构。

Claims (3)

1.一种将可剥离的盖子密封至形成在管状的金属罐主体中的周向的并且向内突出的凸缘的方法，其中，所述凸缘具有密封表面，该密封表面具有大体上V形的轮廓，所述方法包括如下步骤：利用冲压器抵着凸缘的密封表面按压可剥离的盖子，所述冲压器的接合表面具有大体上V形的轮廓，从而使得冲压器的尖端将所述可剥离的盖子按压进入所述凸缘的密封表面的凹处。
2.根据权利要求1所述的将可剥离的盖子密封至形成在管状的金属罐主体中的周向的并且向内突出的凸缘的方法，其中，随着所述可剥离的盖子抵着所述凸缘被按压，热被施加至可剥离的盖子和/或所述凸缘。
3.根据权利要求1或2所述的将可剥离的盖子密封至形成在管状的金属罐主体中的周向的并且向内突出的凸缘的方法，其中所述利用冲压器抵着所述凸缘的密封表面按压可剥离的盖子的步骤大体上消除来自可剥离的盖子与凸缘的密封表面之间的气穴。
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