CN102421682A - 食品填充密封容器的制造方法 - Google Patents

食品填充密封容器的制造方法 Download PDF

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Publication number
CN102421682A
CN102421682A CN201080020286XA CN201080020286A CN102421682A CN 102421682 A CN102421682 A CN 102421682A CN 201080020286X A CN201080020286X A CN 201080020286XA CN 201080020286 A CN201080020286 A CN 201080020286A CN 102421682 A CN102421682 A CN 102421682A
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Prior art keywords
container
food
concavo
convex
container cover
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CN102421682B (zh
Inventor
井関健史
近藤雅胜
久保昌男
增田智之
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Shikoku Kakoki Co Ltd
Yakult Honsha Co Ltd
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Shikoku Kakoki Co Ltd
Yakult Honsha Co Ltd
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    • 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
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/72—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials
    • 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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
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    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/081—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations having a component of vibration not perpendicular to the welding surface
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    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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    • B29C66/731—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
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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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    • 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
    • B29C66/7234—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 comprising a barrier layer
    • B29C66/72341—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 comprising a barrier layer for gases
    • 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
    • B29C66/81433—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 being toothed, i.e. comprising several teeth or pins, or being patterned
    • B29C66/81435—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 being toothed, i.e. comprising several teeth or pins, or being patterned comprising several parallel ridges, e.g. for crimping
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges

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Abstract

本发明提供一种制造具有高商品价值的食品填充密封容器的方法，其中，树脂容器盖在密封后不会产生变形。该食品填充密封容器制造方法是在将食品填充入由热塑性树脂制成的容器体(10)后热封密封由热塑性树脂制成的容器盖(20)的方法，其中，使用了在密封面(13，24)上具有凹凸的容器体(10)和/或容器盖(20)。

Description

食品填充密封容器的制造方法
技术领域
本发明涉及用于制造食品填充密封容器的方法，该方法在将食品填充于容器体中后再热封密封容器盖。
背景技术
过去，在拉伸强度、耐热性、阻光性、成形性、表面光泽度方面都非常优秀的所谓的通用型聚苯乙烯基树脂(GPPS)如苯乙烯均聚物等以及在GPPS中加入SBR(丁苯橡胶)、BR(丁二烯橡胶)等橡胶以改善GPPS的易碎性的耐抗冲性聚苯乙烯(HIPS)大多被用作饮料容器、酸奶容器、分配容器以及用于罐面条等的食品容器。作为贴合密封于这种聚苯乙烯基树脂容器的开口的盖材料，使用了以铝箔为基材并在铝箔表面设有用于与容器粘结的密封剂层的铝层压体。按照盖的展开形状从这样的铝分层物中被冲切而成的小片铝盖材料在端部被回折并被成形为带有裙部的形状，并且被密封到容器的开口。之所以常用这种铝制盖是因为其密封性优良、在剥离时十分稳定并且在被运送到容器开口时静电附着性小地具有良好的片材运送性能。而且，在设有弯折周向边缘而形成的裙部的情况下，该铝制盖在保持弯变形形状的性能方面即在所谓的形状保持方面出色。为此，当直接从该容器中饮用灌充饮料时，因为良好地保持了在容器开口附近的与嘴唇接触的部分被盖端部覆盖的状态，所以能防止污染容器开口附近的区域，而且因为卫生方面出色且外观也美观，所以过去一直被优选使用。
但是最近，异物混入加工食品容器内的事故频发，安全对策成为研究课题。对于使用这种铝制盖的容器，由于不能使用检测整个产品的金属探测器，所以就会有以下问题，即，不能检测金属类而担心钉子、钉书针、模制品拔出刀的碎片、螺栓螺母、金属丝和弹簧混入。此外，对于这些带有铝制盖的容器，需要分别分类回收铝盖、由合成树脂如聚苯乙烯制成的容器体，因而有回收性差的缺点。
作为这种传统铝盖的替代，例如已提出了一种盖材(参见专利文献1)，它是将层压材料冲切成预定形状而形成的，层压材料如此构成，在设有由高密度聚乙烯和聚丙烯基聚合物形成的中心层和在中心层两侧由高密度聚乙烯形成的涂敷层的共挤出膜基材的两侧，在层压耐热膜的层压基材的下表面上设置密封剂层。此外，本申请人已提出一种具有形状保持性能的密封容器，它是通过对聚苯乙烯基树脂片材进行冷成形而获得的，其按照根据ASTM-D3763由落锤冲击测试方法测定的150微米厚片材的传播能为0.015以上(参见专利文献2至6)。
另一方面，已提出一些方法用于通过使用在容器体的唇缘上表面具有突出的热封线的容器和在容器体的唇缘上表面的中心具有线状凹槽的容器而密封容器盖(参见专利文献7和8)。但是，对于专利文献7所述的容器，当内容物为发酵物质时，要对容器的内外通气以防止完全密封；而对于专利文献8所述的容器，要将空气引入不与容器外部连通的凹槽，以便在防止密封不良的同时使铝盖易于脱离。
现有技术文件
专利文献
专利文献1：日本专利申请公开号11-10810；
专利文献2：日本专利申请公开号2004-74795；
专利文献3：日本专利申请公开号2004-74796；
专利文献4：日本专利申请公开号2004-75196；
专利文献5：日本专利申请公开号2004-75197；
专利文献6：日本专利申请公开号2004-154957；
专利文献7：日本专利申请公开号11-152166；和
专利文献8：日本实用新型专利公告号3026497。
发明内容
本发明待解决的问题
在使用由上述热塑性树脂制造的容器盖残留有含气部分地热封密封填充有食品的容器而获得的食品填充密封容器中，伴随环境变化(温度变化和大气压变化)的密封容器内的空气膨胀收缩造成达到引起外观恶化程度的形状改变。即，存在于密封容器中的在热封时被加热的空气随后收缩，容器盖凹陷变形；密封容器长时间暴露于高温下或者大气压力下降造成存在于密封容器内的空气膨胀，容器盖会鼓起；在容器盖由高刚性热塑性树脂制成的情形下，鼓起不是均匀的，会产生起伏弯曲和翘曲，从而损坏其外观，致使商品价值降低。
本发明的目的是提供一种制造具有高商品价值的食品填充密封容器的方法，其容器盖在密封后不会因容器内的空气膨胀收缩而变形。
解决上述问题的方法
为了解决上述问题，本发明人进行了刻苦的研究，结果如此完成了本发明，通过使用容器内空气能在热封期间逃逸于外部地构成的容器体或容器盖来进行热封，即通过使用在密封面上具有凹凸的容器体或容器盖来进行热封，容器内空气在热封期间被排出到外面，留在密封容器中的空气量减小，结果，能够防止由密封容器内的空气膨胀收缩所引起的容器变形。
即，本发明涉及下述内容，(1)制造食品填充密封容器的方法，它是在将食品填充于由热塑性树脂制成的容器体后热封密封由热塑性树脂制成的容器盖的食品填充密封容器制造方法，其中使用在密封面上具有凹凸的容器体或容器盖；(2)根据上述(1)的制造食品填充密封容器的方法，使用在密封面上没有凹凸的容器体和在密封面上具有凹凸的容器盖；(3)制造食品填充密封容器的方法，它是将将食品填充入由耐热性树脂、金属或纸制成的容器体后热封密封由热塑性树脂制成的容器盖的食品填充密封容器制造方法，其中使用在密封面上具有凹凸的容器盖；(4)根据上述(1)至(3)任一所述的制造食品填充密封容器的方法，在密封面上具有凹凸的容器体或容器盖是通过在密封面上没有凹凸的容器体或容器盖的密封面上形成凹凸而制成的；(5)根据上述(1)至(3)任一所述的制造食品填充密封容器的方法，在密封面上具有凹凸的容器体或容器盖是通过在所述容器体或容器盖成形的同时形成凹凸而制成的；(6)根据上述(1)至(3)任一所述的制造食品填充密封容器的方法，由具有凹凸的片材材料制造在密封面上具有凹凸的容器盖；(7)根据上述(1)至(6)任一所述的制造食品填充密封容器的方法，所述凹凸的高度为0.05毫米至1.5毫米；(8)根据上述(1)至(7)任一所述的制造食品填充密封容器的方法，通过压迫容器盖的密封面内侧的中央部分来进行热封；(9)根据上述(1)至(8)任一所述的制造食品填充密封容器的方法，使用超声密封装置进行热封；(10)根据上述(9)所述的制造食品填充密封容器的方法，该超声密封装置的焊头设有加热机构；(11)根据上述(1)至(10)任一所述的制造食品填充密封容器的方法，在容器体在竖向上被压缩的状态下进行密封。
另外，本发明涉及下述内容：(12)根据上述(1)至(11)任一所述的方法制造的食品填充密封容器，该容器盖的中央部分是凹陷的；(13)根据上述(12)所述的食品填充密封容器，在所述容器内产生负压；(14)由热塑性树脂制成的容器体，它是用容器盖通过热封来密封的容器体，其中容器体在密封面上具有沿周向相互间隔的凸起；以及(15)根据上述(14)所述的容器体，所述凸起的高度为0.05毫米至1.5毫米。
而且，本发明涉及：(16)由热塑性树脂制成的容器盖，它热封密封容器体，其中容器盖在密封面上具有凹凸；(17)根据上述(16)所述的容器盖，所述凹凸的高度为0.05毫米至1.5毫米；(18)根据上述(16)或(17)所述的容器盖，所述容器盖由具有凹凸的片材制作；(19)根据上述(16)至(18)任一所述的容器盖，该容器盖是用聚苯乙烯基树脂片材通过冷成形而制成且具有形状保持性能的盖，该盖有顶板部和裙部；以及(20)根据上述(16)至(18)任一所述的容器盖，所述容器盖是穹顶形盖。
发明效果
根据本发明的食品填充密封容器制造方法，容器盖在密封后也不变形，能够获得填充有食品的具有高商品价值的密封容器。
附图说明
图1是示出了本发明的食品填充密封容器制造方法所用的容器体和容器盖的例子的示意图；
图2(A)-2(D)是示出本发明容器体密封面上的凹凸的变型的视图；
图3(A)-3(B)是示出本发明容器盖密封面上的凹凸的变型的视图；
图4是示出本发明的食品填充密封容器制造方法所用的超声密封装置的主要部分的视图；
图5是图4所示的超声密封装置的焊头的仰视图；
图6是图4所示的超声密封装置的焊头的变型的侧视图图；
图7是本发明的食品填充密封容器制造方法的简要示意图；
图8是表示关于实施例和对照例的由密封容器温度上升引起的容器鼓起程度的曲线图；
图9是表示容器盖凸起数量对抑制容器盖鼓起效果的影响的曲线图；
图10是表示超声密封装置的焊头加热对抑制容器盖鼓起效果的影响的曲线图。
具体实施方式
本发明的用于制造食品填充密封容器的第一方法是用于在残留有空气地将容器填充在由热塑性树脂制成的容器体内后热封密封由热塑性树脂制成的容器盖的食品填充密封容器制造方法，没有特别限制，只要是利用了在密封面上具有凹凸的容器体或容器盖的食品填充密封容器制造方法，也可以使用在密封面上均有凹凸的容器体和容器盖。
密封面的凹凸在此是指当容器盖放置在容器体上时能在凹凸之间形成连通容器内外的间隙的凹凸。例如是指在没有凹凸的密封面上随机或按预定间隔地设置的凸起或凹陷(凹槽)和在密封面本身上沿周向形成的起伏。就密封性能而言，在没有凹凸的密封面上设置凸起是优选的。这些凹凸可以是如此设置的凹凸，即当容器盖放置在容器体上时在密封面之间形成空气通道。凸起或凹陷的高度(深度)优选为0.05毫米至1.5毫米，更优选为0.1毫米至0.8毫米，最优选为0.1毫米至0.6毫米。对凸起或凹陷的形状没有特别限制，例如可以列举出剖面形状为半圆形、三角形和四边形的凸起或凹陷。即使这种凹凸设置于密封面上，热塑性树脂的熔融也造成凹凸消失，从而凹凸不会降低商品价值。在容器体或容器盖上设有凹陷的情况下，为了确保容器内空气被排出至外部，凹陷被设置成在容器体或容器盖的密封面的径向上贯通。
具体而言，例如在容器体的密封面上能在多个位置(比如4至16个位置)设置半径为约0.3毫米至2.0毫米且高度为0.05毫米至1.5毫米的半球形凸起、宽度为约0.1毫米至1.0毫米且高度为0.05毫米至1.5毫米的沿径向设置的线性凸起以及宽度为约0.1毫米至1.0毫米且高度(深度)为0.05毫米至1.5毫米的径向贯穿设置的线性凹槽。还可以在容器盖的圆形密封面的多个位置设置半径为约0.3毫米至2.0毫米且高度为0.05毫米至1.5毫米的半球形凸起、宽度为约0.1毫米至1.0毫米且高度为0.05毫米至1.5毫米的沿径向设置的线性凸起以及宽度为约0.1毫米至1.0毫米且高度(深度)为0.05毫米至1.5毫米的径向贯穿设置的线性凹槽。
对凸起和凹槽的数量没有特别限制。但是，数量优选为4或更多，更优选为8至32，因为数量越多，密封(熔接)所需能量就越多，密封时间也就越长，结果，保持较长的形成于容器体和密封面之间的间隙，以排出更多的容器内空气。
如上所述，在本发明的食品填充密封容器制造方法中，能使用在密封面上具有凹凸的容器体和/或容器盖。但是，使用在密封面上没有凹凸的容器体以及在密封面上具有凹凸的容器盖是优选的。即使在容器体的密封面上设有凹凸的情形下，几乎所有凹凸因热塑性树脂的熔化而消失。但是，在容器盖侧面上设有凹凸的情形下，容器体的密封面被保持在更没有凹凸的状态，因此例如在以口直接接触容器体地饮食时不会带来不适，保持了在饮食时被频繁关注的容器体自身的美观。而且，密封面上没有凹凸是指在密封面上没有能形成连通容器内外的间隙的凹凸(在周向上没有凹凸)。没有凹凸不仅包括平坦密封面的情形，也包括例如这样的密封面情形，密封面会以截面呈圆弧形的方式鼓出，如果密封面没有上述凹凸的话。
例如通过在没有凹凸的容器体密封面上形成凹凸，能够制造由热塑性树脂制成的在密封面上具有凹凸的上述容器体。具体而言，能通过以下几种方法来制造，将热塑性树脂熔接在没有凹凸的密封面上形成凸起的方法，从没有凹凸的密封面的内侧施压而在密封面外侧形成凸起的方法，切除没有凹凸的密封面的一部分来形成凹陷的方法，将表面凹凸的树脂熔化部件压紧到没有凹凸的密封面来形成凹凸的方法。另外，通过在容器体成形的同时形成凹凸，能制造密封面上有凹凸的容器体。而且，能利用例如注射模制和吹塑法等已知的模制方法来成形容器体。
例如，通过在没有凹凸的容器盖密封面上形成凹凸，能够制造由热塑性树脂制成的在密封面上具有凹凸的上述容器盖。具体而言，如同容器体的情形一样，能通过以下几种方法来制造，将热塑性树脂熔接在没有凹凸的密封面来形成凸起的方法，从没有凹凸的密封面的内侧施压而在密封面外侧形成凸起的方法，切除没有凹凸的密封面的一部分来形成凹陷的方法，将表面凹凸的树脂熔化部件压紧到没有凹凸的密封面来形成凹凸的方法。另外，通过在容器盖成形的同时形成凹凸，能制造密封面上有凹凸的容器盖。而且，在使用片材成形的情形下，能使用具有凹凸的片材来制造。
本发明中的由热塑性树脂制成的容器体和由热塑性树脂制成的容器盖是指以热塑性树脂为主的容器体和容器盖，此外也可以具有由热塑性树脂以外的成分构成的防静电层、气体阻隔层、印刷层等。可以列举出过去已知的热塑性树脂例如聚乙烯、聚丙烯、聚苯乙烯、AS树脂、ABS树脂等，作为这种构成容器体和容器盖的主要组分的热塑性树脂。尽管容器体和容器盖制造所使用的热塑性树脂的种类可以是彼此不同的，但就回收使用性而言优选同种类的树脂。具体而言，作为本发明的由热塑性树脂制成的容器体和由热塑性树脂制成的容器盖，能优选列举出如日本专利申请公开号2004-74795、日本专利申请公开号2004-74796、日本专利申请公开号2004-75196、日本专利申请公开号2004-75197、日本专利申请公开号2004-154957所述的、由聚苯乙烯基树脂制成的容器体和通过冷成形用聚苯乙烯基树脂片制造的且具有设有顶部和裙部的、具有形状保持性能的容器盖。在通过冷成形制成的容器盖上形成凹凸的场合下，例如在日本专利申请公开号2004-154957所述的成形工具和/或盖回顶活塞上形成凹凸，以及在冷模制容器盖时，能够在容器盖上形成凹凸。
对本发明的食品填充密封容器制造方法中的热封方法没有特别限制，只要是将容器体和/或容器盖的热塑性树脂热熔密封(热熔接)的方法即可，例如可以列举出热板密封方法、热风密封方法、高频密封方法、超声密封方法。就密封性能而言，超声密封方法是优选的。在本发明的食品填充密封容器制造方法中，因为容器体或容器盖在密封面上具有凹凸且该结构使容器内空气能逃逸至外部，所以在热封的同时使空气逃逸至外部，留在容器内的空气量减小，能够防止容器盖在密封后变形。
在热封期间，通过压迫容器盖密封面内侧的盖中央部分地进行热封，能够使更多的空气被排出容器外，进而能更可靠地防止密封后的容器盖变形。具体而言，例如优选使用在焊头中央部分(与容器盖的中央部分对应)具有突起的热封装置进行热封。
在进行超声密封的情形下，优选使用带有加热机构的焊头进行密封。由此，容器内空气通过焊头热量被加热膨胀，结果，也能把如此膨胀的空气排至容器外，从而可进一步减少留在容器内的空气量。例如，沿焊头周向布置的环形空气吹管能作为焊头加热机构。一般，设置围绕焊头布置的环形空气吹管是为了防止焊头过热，但在本发明方法中，可使用该空气吹管来吹热风或暖风，由此增加本发明的作用效果。
而且在进行密封时，优选在沿竖向压缩的状态下密封容器体，压缩量例如为0.3毫米至3.0毫米左右。就是说，通过用热封装置的焊头以及容器安置台(储存台)上下压紧容器体并且在密封时压缩容器体，可以排出容器内的更多空气。
本发明的用于制造食品填充密封容器的第二方法是在将食品填充于由耐热性树脂、金属或纸制成的容器体中后热封密封由热塑性树脂制成的容器盖的食品填充密封容器制造方法。对该方法没有特殊限制，只要它是使用在密封面上有凹凸的容器盖的食品填充密封容器制造方法。关于在密封面上具有凹凸的容器盖以及热封方法，上述第一制造方法所述的内容同样适用于此。在本发明的用于制造食品填充密封容器的第二方法中，容器体由耐热性树脂、金属或纸制成，是以各自材料为主的容器。耐热性树脂是指具有不受在热封期间里的热影响的耐热性的树脂，具体说是在热封期间不会熔化软化的热塑性树脂和在热封期间不会热分解的热固性树脂。具体而言，作为能用在本发明的用于制造食品填充密封容器的第二方法中的容器体和容器盖，可优选举例示出如日本专利申请公开号2005-40096所述的铝容器体及由热塑性树脂制成的穹顶形容器盖。为了提高密封性能，在容器体的密封面上也可以设有在热封时熔化的热塑性树脂。
在通过上述的用于制造食品填充密封容器的第一方法和第二方法制造的食品填充密封容器中，容器盖的中央部分凹陷，在容器内产生负压。由此，即使环境发生变化如大气压上升和温度下降，容器盖也不会显著地从初始位置凹陷下去，而且即使环境发生变化如大气压下降和温度上升，头部空间中的空气状态变化也首先产生压力上升，然后，该压力变得与大气压相同，其后体积显著增大，容器盖开始鼓起。因此，除非在一定的环境变化下，才会产生容器盖的鼓起。
以下参照附图来更具体地描述本发明。但是，本发明的技术范围不受这些示例的限制。图1是示意图，示出了本发明的食品填充密封容器制造方法所用的容器体和容器盖的例子。图2(A)至2(D)示出了在容器体密封面上的凹凸的变型。图3(A)至3(B)示出了容器盖密封面上的凹凸的变型。图4示出了本发明的食品填充密封容器制造方法所用的超声装置的主要部分。图5是图4所示超声装置的焊头的仰视图。图6是图4所示的超声装置的变型的侧视图。图7是本发明的食品填充密封容器制造方法的简略示意图。
如图1所示，用于本发明的食品填充密封容器制造方法的容器体10例如由聚苯乙烯基树脂制成并且具有筒部11和唇缘12，唇缘12的上表面13成为密封面。容器盖20由与容器体10相同的聚苯乙烯基树脂制成并且具有顶板部22和裙部23，该顶板部具有与容器体10唇缘12对应的凸形外周部21，上述凸形外周部21的下表面24成为密封面。
在用于本发明的食品填充密封容器制造方法中，使用了在密封面13、24上有凹凸的容器体10和/或容器盖20。例如如图2所示，在容器体10的密封面13上设有半球形凸起13a(图2(A))、凸起13b、凹槽13c、竖向的起伏波纹13d(图2(D))，凸起13b为沿密封面径向延伸的纵截面为四边形的长方体状凸起(图2(B))，凹槽13c为沿密封面径向延伸的纵截面为四边形的凹槽(图2(C))。而且如图3所示，容器盖20的密封面24上设有半球形凸起24a(图3(A))和长方体形凸起24b(图3(B))。
在通过密封在密封面上有凹凸(如上所述)的容器体10和容器盖20制造的密封容器中，例如可以使用如图4所示的超声密封装置(具体细节，请参阅WO2002-072426)。如图4所示，超声密封装置30设置有容器安置台31和布置在安置台31上方的焊头32，在容器安置台31上设有容器固定装置33。如图5和图6所示，在超声密封装置30的焊头32的中央部分设有凸起34，这种凸起的形状例如可以是与容器盖20相接触的部分为平面的凸起34a(图6(A))和曲面状凸起34b(图6(B))。
如图7所示，通过使用超声密封装置30将容器盖20密封到容器体10时，首先，预加热超声密封装置30的焊头32(图7(a))，在将盖上容器盖20的容器体10安放于安置台(储存台)31的状态下，使安置台31向上移动，从而容器体与焊头32抵压接触，与此同时，使焊头32在周向上的超声旋转振动发生作用以进行密封(图7(b)和7(c))。此时，在使用在中央部有凸起的焊头32的同时，容器体10被压缩了高度d，结果，体积缩小，从而与该体积对应的空气从由密封面凹凸所形成的间隙被排出。而且，由于容器内空气被焊头32热量加热膨胀，如此膨胀的空气也被排出。通过使容器安置台31下降，使容器脱离储存台压力作用，从压缩变形的状态复原，体积恢复到初始状态。但是，由于在空气量比初期少的状态下密封，所以在容器内产生负压，从而盖变得凹陷(图7(d))。由此，能够防止密封后的容器盖20变形。在这里，储存台压力是指，当通过安置台(储存台)31向上运动而使盖上容器盖20的容器体10接触焊头32并被压缩时的施加于容器盖20和容器体10的压力。
实施例
实施例1
食品填充密封容器是由聚苯乙烯基树脂构成的容器体和具有形状保持性能的容器盖制成的，该容器盖由聚苯乙烯基树脂片材冷成形制造并且具有顶板部和裙部。作为本发明实施例所涉及的容器体和容器盖，采用直径约40毫米的密封面(唇缘上表面)上没有凹凸的容器体(容器体具有截面为圆弧形的密封面)以及在密封面上有延伸到容器体侧的凸起的容器盖。在容器盖上，等间隔地设置16个直径为1.4毫米且高度为0.8毫米的半球形凸起。作为对照例所涉及的容器体和容器盖，采用了与该实施例相同构型的容器体和容器盖，除了在容器盖密封面上没有设置凸起外。
利用实施例和对照例所涉及的容器体和容器盖制造密封容器(样品)。具体而言，在容器体内加入3℃的水后，用超声密封装置(CYS超声密封装置，四国化工机械有限公司)密封容器盖，制成密封样品。检测密封样品的内部压力，实施例和对照例所涉及的样品之间的内部压力差为约1.25千帕，相对于在对照例的容器内出现了正压，在实施例的容器内出现负压。
试验例1
对容器盖鼓起抑制效果的确认
将样品在5℃室温的低温室内保存6小时以上，进入稳定状态。随后，将样品移入静放在37℃室温的恒温室内，在液体温度达到30℃前，在60分钟内以15分钟间隔测量液体温度和盖子高度，60分钟后以30分钟间隔测量液体温度和盖子高度。在对盖子高度的测量中使用激光位移计(Keyence公司制造的LK-080，分辨率为0.1微米)，从被直立起来的被检对象样品上方进行测量。具体而言，对盖子中心和距离该中心10毫米的周边部四个位置进行测量，将以容器开口为基准的5个点的平均高度作为该样品的容器盖中央部分高度。其结果示于图8中。
由图8中可知，在对照例的容器中，当液体温度达到约18℃时，容器盖中央部分鼓凸至不低于容器开口高度，而在实施例的容器中，甚至在液体温度达到约30℃时维持0.9毫米的凹陷，说明了对容器盖鼓起现象的抑制效果。另外，在凸起的高度为0.1毫米和0.6毫米的情形下，也确认了对容器盖鼓凸现象的抑制效果。
试验例2 凸起数量对容器盖鼓起抑制效果的影响
还是在容器盖的凸起数量为1个和4个的情形下，以与试验例1相同的方式检测容器盖鼓起抑制效果。图9示出了在测量开始后的容器盖中央部分高度的位移量，即容器盖中央部分的鼓起量。
由图9中可知，凸起数量越多，鼓起抑制效果越大。据推测这是因为，在密封容器盖时，通过碾压凸起来进行熔接和密封，凸起数量越多，就需要更多的能量，从振动开始到密封结束所需要的事件延长，更多空气会逃逸，从而鼓起现象抑制效果增强。
试验例3 焊头加热对容器盖鼓起抑制效果的影响
在超声密封装置的焊头被加热到40℃和焊头未被加热的场合，与试验例1一样地检测容器盖鼓起抑制效果。图10示出其结果。
如图10所示，与预焊头未被加热时相比，由液体温度上升而引起的容器盖鼓起在焊头被加热的情况下要小许多，显然，通过加热焊头，进一步加强了容器盖鼓起抑制效果。
附图标记列表
10 容器体；11 筒部；12 唇缘；13 上表面(密封面)；13a 半球形凸起；13b长方体形凸起；13c 凹槽；13d 起伏波纹；20 容器盖；21 凸形外周部；22顶板部；23 裙部；24 下表面(密封面)；24a 半球形凸起；24b 长方体形凸起；30 超声密封装置；31 安置台；32 焊头；33 容器固定装置；34 凸部。

Claims (20)

1.一种用于制造食品填充密封容器的方法，它是在将食品填充于由热塑性树脂制成的容器体中后热封密封由热塑性树脂制成的容器盖的食品填充密封容器制造方法，其特征是，使用在密封面上具有凹凸的容器体或容器盖。
2.根据权利要求1所述的用于制造食品填充密封容器的方法，其特征是，使用在密封面上没有凹凸的容器体和在密封面上具有凹凸的容器盖。
3.一种用于制造食品填充密封容器的方法，它是将食品填充于由耐热性树脂、金属或纸制成的容器体中后热封密封由热塑性树脂制成的容器盖的食品填充密封容器制造方法，其特征是，使用在密封面上具有凹凸的容器盖。
4.根据权利要求1至3中任一项所述的用于制造食品填充密封容器的方法，其特征是，在密封面上具有凹凸的该容器体或容器盖是通过在该容器体或容器盖的不具有凹凸的密封面上形成凹凸而制成的。
5.根据权利要求1至3中任一项所述的用于制造食品填充密封容器的方法，其特征是，在密封面上具有凹凸的该容器体或容器盖是通过在该容器体或容器盖成形的同时形成凹凸而制成的。
6.根据权利要求1至3中任一项所述的用于制造食品填充密封容器的方法，其特征是，在密封面上具有凹凸的该容器盖是用具有凹凸的片材制成的。
7.根据权利要求1至6中任一项所述的用于制造食品填充密封容器的方法，其特征是，所述凹凸的高度为0.05毫米至1.5毫米。
8.根据权利要求1至7中任一项所述的用于制造食品填充密封容器的方法，其特征是，压迫在该容器盖的密封面内侧的盖中央部来进行热封。
9.根据权利要求1至8中任一项所述的用于制造食品填充密封容器的方法，其特征是，使用超声密封装置进行热封。
10.根据权利要求9所述的用于制造食品填充密封容器的方法，其特征是，该超声密封装置的焊头设有加热机构。
11.根据权利要求1至10中任一项所述的用于制造食品填充密封容器的方法，其特征是，在该容器体在竖向上被压缩的状态下进行密封。
12.一种根据权利要求1至11中任一项所述的方法制造的食品填充密封容器，其特征是，该容器盖的中央部分凹陷下去。
13.根据权利要求12所述的食品填充密封容器，其特征是，在该容器内产生负压。
14.一种容器体，它是用容器盖通过热封被密封的由热塑性树脂制成的容器体，其特征是，该容器体在密封面上具有沿周向相互间隔开的凸起。
15.根据权利要求14所述的容器体，其特真是，所述凸起的高度是0.05毫米至1.5毫米。
16.一种容器盖，它是通过热封密封容器体的且由热塑性树脂制成的容器盖，其特征是，盖容器盖在密封面上具有凹凸。
17.根据权利要求16所述的容器盖，其特征是，所述凹凸的高度是0.05毫米至1.5毫米。
18.根据权利要求16或17所述的容器盖，其特征是，它由具有凹凸的片材来制作。
19.根据权利要求16至18中任一项所述的容器盖，其特征是，该容器盖是用聚苯乙烯基树脂片材通过冷成形而制成的且具有形状保持性能的盖，该盖有顶板部和裙部。
20.根据权利要求16至18中任一项所述的容器盖，其特征是，所述容器盖是穹顶形盖。
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