CN1856430A - 塑料瓶 - Google Patents
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Abstract
塑料瓶(1),其特征在于:它们包括瓶颈(2)、瓶肩(3)、瓶体(4)和瓶底(5);在瓶体(3)处的横截面形状是正多边形,多边形的角的个数是不小于4,不大于32的偶数;多边形的每个角用弧(8)来弄圆,该弧的半径不长于在瓶体(3)处环绕横截面形状的外切圆的半径的一半;横截面形状在瓶体(3)的任何部分都是相同的;环绕横截面形状的外切圆彼此是相同的;外切圆的中心在瓶体(3)的垂直中心轴线上;并且瓶体(3)的横截面形状围绕该中心轴线与沿该中心轴线的高度成比例地旋转。
Description
技术领域
本发明涉及用作液体容器的塑料瓶,更确切地说,涉及用于热灌装或无菌灌装饮料的塑料瓶。
背景技术
用聚对苯二甲酸乙酯(PET)材料制成的双轴拉伸吹模成形瓶广泛用来作为饮料容器。容器通常通过热灌装或通过无菌灌装来灌装饮料产品。在热灌装中,双轴拉伸吹模容器灌装有加热至90℃左右的饮料,用盖密封,然后冷却。在无菌灌装中,容器被消毒,然后在产生的无菌环境中进行灌装。热灌装伴随的一个问题是当灌装或加盖时容器膨胀,并且在冷却时,容器由于内部压力降低而收缩。无菌灌装也有一个问题:由于在顶端空间中吸收氧气的成分造成压力降低,容器收缩。
近年来,这些PET瓶经常在受热的橱窗中陈列。这引起当受热时由于内部压力升高容器胀大的问题。
作为针对上述问题的解决方案,瓶子在它们的瓶体上通常设有吸收板条或者凹肋,当瓶子膨胀时它们胀大,当瓶子减压时缩小,这样就吸收了变形。在另一种解决方案中,增加材料树脂的数量由此提高瓶子的刚性。这些方法要求有大的吸收板条,其牺牲了瓶子的外观。从总体设计的观点来看,这些瓶子在外形上也缺少连续性,因此显得不协调。
此外,吸收板条有凹-凸形状。因此,当把收缩条贴在瓶子上用于表面装饰时,在瓶子和收缩条之间能够产生间隙,造成如下问题:瓶子的搬运困难,收缩条在运输期间被撕开,以及截留在这些间隙中的水分很难除掉。
如果不使用热隔离板条,则瓶子可以为柱状,由此避免了上述的问题,当瓶子减压时,不均匀收缩,牺牲了它们的外观。此外,如果减少了瓶子的材料树脂的数量,纵向弯曲强度就降低,因此当瓶子叠放时会压坏。由于这些问题,使得瓶子承受减压的唯一现实方法是增加瓶子的材料树脂的数量,从生产率和经济的观点来看,这是不希望的。
另一种可能的解决方案是多边形的瓶子,如日本外观设计注册No.935840。这个解决方案有一个问题:由于缺少热隔离板条,这种形状的瓶子的强度低。所以,构成侧壁的每个面在降低的压力下在垂直方向挠曲,产生明显的变形。另外,壁厚薄的部分在降低的压力下屈服,于是,只有这些部分的面弯曲,呈现明显的变形。
在日本外观设计注册No.961967中所示的瓶子中,三角形的表面成几何排列,并且排列在扭转壁的上面部分和下面部分上,该结构用于给出坚固的瓶子。此外,垂直段(侧壁)是带凹槽的台阶形状,它也是用于加固。作为上述结构的结果,每个扭转的侧面阻止变形,也用于加固瓶子。因此,在日本外观设计注册No.961967中公开的瓶子的形状适当设计成提高瓶子的强度(增加容器的刚度)。然而,当降低的压力作用在瓶子上时,刚性好就可能仅在薄的区域产生弯曲,这就导致严重的变形。进一步地,因为垂直段有一个台阶形状,那里错综复杂地排列了三角形的面,所以有如下担心:在无菌灌装的消毒阶段,消毒液体的流量在某些区域可能不够,或者液体可能无法完全洗净。
此外,瓶子的形状至今已经被限制为诸如柱形或方形之类的样式,来保证在饮料生产线上快速和可靠地灌瓶,特别是保证在连续生产线上当滑动和供料时瓶子不倒,而且也便于瓶子在成形机(casers)中整齐地包装。
发明内容
为了解决关于传统瓶子的上述问题,本发明是以低廉的价格提供塑料饮料瓶,在无菌灌装和热灌装中,塑料饮料瓶没有由于发热或冷却造成瓶内压力变化而出现不协调的变形,塑料饮料瓶能够吸收减压的体积,塑料饮料瓶是如此精心设计来避免粗劣的外观,并且塑料饮料瓶便于用户搬运,收缩条在运输期间不会被撕开或剥落,塑料饮料瓶具有很高的承载强度和水平压缩强度以及包装强度,并且在瓶子灌装线上不产生问题。
为了满足上述的目标,本发明的塑料瓶的特征在于:它们包括瓶颈、瓶肩、瓶体和瓶底;在瓶体处的横截面形状是正多边形,多边形的角是不小于4,不大于32的偶数;多边形的每个角用弧弄圆,该弧的半径不大于在瓶体处环绕横截面形状的外切圆的半径的一半;横截面形状在瓶体的任何部分都是相同的;环绕横截面形状的外切圆彼此是相同的;外切圆的中心在瓶体的垂直中心轴线上;并且瓶体的横截面形状围绕该中心轴线与沿该中心轴线的高度成比例地旋转。
在上述塑料瓶的一个优选实施例中,瓶体的横截面旋转来构成360°/多边形中角的个数的旋转角。
在上述塑料瓶的另一个优选实施例中,在瓶肩处横截面也是多边形,其中,每个角用圆弧来弄圆,并且所述横截面不旋转。
在上述塑料瓶的另一个优选实施例中,塑料瓶是由聚对苯二甲酸乙酯制成,并且通过双轴拉伸吹模成形。
在这些条件下制造的瓶子从瓶底到瓶肩有扭转的正多边形形状的侧壁。当这个容器减压时,在扭转方向上,每个面减压,而容器作为一个整体抵消由减压造成的变形。这样,虽然变形发生了,但是与变形前的容器的形状相比并不明显。对于由变形引起的抗减压强度,瓶子变形作为一个整体因此变形可以抵消,所以,像所谓弯曲这样的显著变形就很难出现。因此,以“影响产品合格性的显著变形”的概念来看,本发明的瓶子可以说抗减压能力比传统瓶子要强。可以说本发明的瓶子根据内部压力变化象呼吸一样变化。已经确认,在上述说明中,尽管出现像弯曲这样的严重变形,只要释放减压,瓶子就马上恢复到原始的形状,不像用板条加固的传统瓶子那样不会恢复到它们原始的形状。
本发明提供塑料饮料瓶,在无菌灌装和热灌装中,塑料饮料瓶由于受热或冷却造成瓶内压力变化没有不协调的变形,塑料饮料瓶是如此精心设计来避免粗劣的外观,并且塑料饮料瓶便于用户搬运,收缩条在运输期间不会被撕开或剥落,塑料饮料瓶具有很高的承载强度,并且在瓶子灌装线上不产生问题。
在传统的塑料瓶中,当内部压力变化时,瓶颈段的中心轴线斜伸出瓶体的中心轴线,于是变形出现。在本发明的瓶子中,多条螺旋线较紧地围绕瓶体缠绕,结果是塑料瓶的高度降低,因此体积减小。或者反过来,多条螺旋线较松地围绕瓶体缠绕,结果是塑料瓶的高度升高,因此体积加大。这种变形防止本发明的塑料瓶以瓶颈段的中心轴线斜伸出瓶体段中心轴线的方式变形。
附图说明
图1:本发明的一个实施例的示意图。
图2:本发明的一个实施例的瓶体的横截面图。
图3:本发明的一个实施例的瓶体的横截面图。
具体实施方式
图1表示本发明的一个实施例。本发明的塑料瓶(1)包括瓶颈(2)、瓶肩(3)、瓶体(4)和瓶底(5),并且瓶子(1)用封塞(6)来密封。对于封塞(6),任何形式都能够接受只要它保证可靠的密封。封塞的例子包括螺旋盖、压盖和热封,从开启后再盖上的角度来看,其中的螺旋盖是更为可取的。
对于塑料瓶的材料,聚丙烯、聚乙烯、聚酰胺、聚对苯二甲酸乙酯和层压塑料是可想到的,这些材料中的任何一种都是允许的只要能够制成要求的瓶子形状。针对饮料的使用来看,用聚对苯二甲酸乙酯材料双轴拉伸吹模制成的瓶子是更可取的。
这个塑料瓶(1)的瓶体处的横截面(7)是正多边形,其中,每个角用弧(8)来弄圆。在塑料瓶瓶体的底端(9)和顶端(10)之间任何断面都有相同的形状。由于这个特点,瓶体上不会产生凹陷。所以,当把收缩条贴在瓶子上用于表面装饰时,在瓶子和收缩条之间不产生间隙,于是,配送期间防止收缩条剥落和撕开,并且,又防止水分在瓶子和收缩条之间聚集。在收缩条和瓶子之间没有间隙使用户搬运方便。
本发明的瓶子的进一步特征在于:在瓶体处环绕横截面的任一外切圆(11)有相同的形状,并且这种外切圆的中心(12)处于同一轴线上。
正多边形的角的个数最好是4和32之间的偶数。如果角的个数超过32,外部形状变得与圆柱瓶没有区别。从设计的观点出发,六个或八个是希望的。如果角的个数是奇数,当瓶子吹起时壁厚变得不一致。此外,吹模的对分线会变得复杂,并且当把瓶子从模具中取出时会出现划痕。
在瓶体处多边形的每个角用圆弧(8)来弄圆,圆弧的半径不大于环绕瓶体横截面的外切圆(11)的半径的一半。这个特征不仅导致优秀的设计,用来给出一个多边形表面的漂亮外表,而且当弧(8)的半径小时还产生加强肋的作用,这一作用提高了抗垂直载荷的能力。
在塑料瓶瓶体的底端(9)和顶端(10)之间任何断面有相同的形状。此外,在瓶体处环绕横截面形状的任何外切圆(11)有相同的形状,并且这些外切圆的中心(12)位于同一轴线上。由于这些特征,瓶子在生产线上很少发生故障。
在瓶体处的横截面是围绕瓶体处环绕横截面的外切圆的中心(12)旋转,并且和高度成比例。这个特征实现了流畅的轮廓同时改善了抗水平载荷的能力。由于这种旋转,瓶子的接触表面接近圆形,改善了滚动性能。这也便于给瓶类自动售货机装货。
在已经是技术问题的内部体积的变化方面,也由于旋转使瓶子在垂直方向膨胀或收缩,因而允许不破坏外观的变形。就瓶体处横截面形状的旋转角和高度之间的关系而论,最好是0.6°/mm或更小,或者,更希望是360°/角的个数。当旋转角与高度相关而太大时,模具的下切变大,造成在吹模中从模具里拔出瓶子变得困难的问题,并且当瓶子从模具里拔出时出现划痕。当旋转角是360°/角的个数时,不出现下切的问题,并且瓶子的吹模没有任何问题。
关于瓶子的设计,在瓶肩处的横截面形状也可以是多边形,多边形的每个角用弧弄圆,目的是更加突出流线的形象。在这种情况下,最好不旋转横截面形状以避免下切问题。
举例
上述发明的一个实施例由以下的工作例子来说明。
瓶子是使用聚对苯二甲酸乙酯材料采用双轴拉伸吹模制造的,材料树脂使用量29g,容量是500ml,最大直径67mm,并且高度是207mm。瓶子包括瓶颈、瓶肩、瓶体和瓶底。在瓶体处的横截面形状是正多边形。多边形的每个角用弧来弄圆。在瓶体的任何部分横截面有相同的形状。环绕横截面形状的外切圆是相同的。外切圆的中心是在同一轴线上。外切圆半径是33.5mm。弧的半径是5mm。
在瓶体处的横截面形状是以0.4°/mm变化率围绕作为轴线的、环绕所述横截面形状的外切圆的中心均匀地旋转。总的旋转角是60°。在瓶肩处,横截面形状也是一个正多边形,多边形的每个角用弧来弄圆。横截面形状不旋转。
按照上述设计的瓶子有良好的合格率,和良好的“搬运能力”。热灌装后然后冷却,瓶子在生产线适用性方面不产生问题。瓶子保持令人满意的外观。当经受运输试验时,瓶子既不发生收缩条剥落,也不在载荷下弯曲。
工业适用性
本发明的塑料瓶作为在市场上用于饮料的容器是适用的。
Claims (5)
1.塑料瓶,其特征在于:它们包括瓶颈、瓶肩、瓶体和瓶底;在瓶体处的横截面形状是正多边形,该正多边形的角的个数是不小于4、不大于32的偶数;该正多边形的每个角用弧弄圆,该弧的半径不大于在瓶体处环绕横截面形状的外切圆的半径的一半;横截面形状在瓶体的任何部分都是相同的;环绕横截面形状的外切圆彼此是相同的;外切圆的中心在瓶体的垂直中心轴线上;并且瓶体的横截面形状围绕该中心轴线与沿该中心轴线的高度成比例地旋转。
2.根据权利要求1所述的塑料瓶,其中,在瓶体处的横截面形状旋转,旋转角与高度之间的关系是1°/mm或更小。
3.根据权利要求1或2所述的塑料瓶,其中,在瓶体处的横截面形状旋转,构成360°/多边形中角的个数的旋转角。
4.根据权利要求1至3中任一项所述的塑料瓶,其中,在瓶肩处的横截面形状也是多边形,该多边形的每个角都用弧来弄圆,并且,横截面形状不旋转。
5.根据权利要求1至4中任一项所述的塑料瓶,它们由聚对苯二甲酸乙酯制成,并且通过双轴拉伸吹模成形。
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JP343481/2003 | 2003-10-01 | ||
JP2003343481A JP4452475B2 (ja) | 2003-10-01 | 2003-10-01 | プラスチックボトル |
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CN1856430A true CN1856430A (zh) | 2006-11-01 |
CN100540405C CN100540405C (zh) | 2009-09-16 |
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US (1) | US20070068894A1 (zh) |
EP (1) | EP1675773A1 (zh) |
JP (1) | JP4452475B2 (zh) |
CN (1) | CN100540405C (zh) |
AU (1) | AU2004278264B2 (zh) |
CA (1) | CA2541008A1 (zh) |
MX (1) | MXPA06002604A (zh) |
RU (1) | RU2340521C2 (zh) |
WO (1) | WO2005032958A1 (zh) |
ZA (1) | ZA200602638B (zh) |
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- 2003-10-01 JP JP2003343481A patent/JP4452475B2/ja not_active Expired - Lifetime
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2004
- 2004-09-30 EP EP04773674A patent/EP1675773A1/en not_active Withdrawn
- 2004-09-30 CA CA002541008A patent/CA2541008A1/en not_active Abandoned
- 2004-09-30 RU RU2006114732/12A patent/RU2340521C2/ru not_active IP Right Cessation
- 2004-09-30 AU AU2004278264A patent/AU2004278264B2/en not_active Ceased
- 2004-09-30 MX MXPA06002604A patent/MXPA06002604A/es active IP Right Grant
- 2004-09-30 CN CNB2004800274966A patent/CN100540405C/zh not_active Expired - Fee Related
- 2004-09-30 WO PCT/JP2004/014813 patent/WO2005032958A1/en not_active Application Discontinuation
- 2004-09-30 US US10/573,013 patent/US20070068894A1/en not_active Abandoned
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2006
- 2006-03-30 ZA ZA200602638A patent/ZA200602638B/en unknown
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CN109196159A (zh) * | 2016-04-22 | 2019-01-11 | 雷克特本克斯尔菲尼施公司 | 可变形容器 |
CN109196159B (zh) * | 2016-04-22 | 2021-04-16 | 雷克特本克斯尔菲尼施公司 | 可变形容器及其制造方法和从可变形容器分配流体的方法 |
CN108151284A (zh) * | 2018-02-05 | 2018-06-12 | 水爱电器科技(上海)有限公司 | 能够避免局部受热变形的塑料片 |
Also Published As
Publication number | Publication date |
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WO2005032958A1 (en) | 2005-04-14 |
MXPA06002604A (es) | 2006-06-05 |
AU2004278264B2 (en) | 2010-05-27 |
JP4452475B2 (ja) | 2010-04-21 |
RU2006114732A (ru) | 2007-11-20 |
RU2340521C2 (ru) | 2008-12-10 |
CN100540405C (zh) | 2009-09-16 |
AU2004278264A1 (en) | 2005-04-14 |
ZA200602638B (en) | 2007-09-26 |
CA2541008A1 (en) | 2005-04-14 |
JP2006335357A (ja) | 2006-12-14 |
EP1675773A1 (en) | 2006-07-05 |
US20070068894A1 (en) | 2007-03-29 |
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