CN1332856C - 吹塑成形容器 - Google Patents

吹塑成形容器 Download PDF

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CN1332856C
CN1332856C CNB028033388A CN02803338A CN1332856C CN 1332856 C CN1332856 C CN 1332856C CN B028033388 A CNB028033388 A CN B028033388A CN 02803338 A CN02803338 A CN 02803338A CN 1332856 C CN1332856 C CN 1332856C
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米山正史
中村弘幸
瀬口昌人
后藤孝之
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Yoshino Kogyosho Co Ltd
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Abstract

本发明提供一种吹塑成形容器,通过吹塑成形形成,包括:形成定形的外壳的合成树脂制的外层;剥离自如地叠层于该外层,形成内袋的挠性合成树脂制的内层;以及纵带状的一对粘接带,该粘接带把上述外层和内层在整个高度范围内粘接固定,并大致对称于容器(1)的中心轴且避开在上述外层上形成的使外部空气侵入该外层与内层之间的吸气孔的位置,以分模线为界,使该一对粘接带位于相反侧,并且在上述容器的底部的由吹塑组合金属模具的挟断部扁平地挟断所形成的封底部处,使上述两个粘接带的下端缘对接状地处于相向位置,借此提供具有充分的底部的机械强度,且能够用通常的金属模具形成,生产性高的分层式容器。

Description

吹塑成形容器
技术领域
本发明涉及在形成定形的外壳的外层内,剥离自如地叠层形成形成变形自如的内袋的内层,不改变外观形状,而可以排出使用内装液的叠层剥离合成树脂制吹塑成形容器。
背景技术
在形成定形的外壳的外层内,剥离自如地叠层形成变形自如的内袋的内层而构成的,一般称为分层瓶的作为吹塑成形罐体的叠层剥离合成树脂制容器是公知的。
该吹塑成形的叠层剥离合成树脂制容器虽然通过把几乎没有相溶性的外层型坯和内层型坯共同挤压而挤压形成叠层型坯,把该叠层型坯吹塑成形而得到,但是因为靠吹塑金属模具的挟断部挟断成形的封底部分基本为几乎没有相溶性的外层部分和内层部分的叠层结构,故存在着外层部分上容易发生底裂的缺点。
作为消除该缺点的现有技术,有重合压接一对肋片而使其成形为沿着分模线的突条状,在该突条状物上设置多个从一对肋片的一方咬合另一方的咬合部而构成靠吹塑金属模具的挟断部扁平地挟断而成形的封底部的技术(参照特开平8-216238号公报)。
该现有技术,通过把封底部制成具有高度宽度的突条状,来加大封底部的外层与内层的压接面积,和设置多个咬合部,不仅进一步增大外层与内层的压接面积,而且大大提高对平行于压接面的剪切力的抵抗力,借此不容易发生底裂,并可以得到机械强度高的封底部。
但是,在上述现有技术中,因容器的吹塑成形结束后的底部的历时收缩的影响,存在着在封底部上有时发生底裂,特别是在大型容器中,如果在充填了内装液的状态下跌落,或者受到冲击,则屡屡发生底裂这样的问题。
因此,这种吹塑成形容器虽然有必要在金属模具内收缩,也就是结束冷却收缩,但是由于封底部具有较大的高度宽度和厚度,所以存在着其体积变大,因此冷却需要较长时间,容器的生产效率极低这样的问题。
因此,本发明是将要消除上述现有技术中的问题的发明,以不增大封底部的体积,而实现封底部的外层彼此的牢固的粘接为技术课题,因而其目的在于提供一种底部的作为底座的功能不降低,此外提高生产效率,强度和经济性优良的叠层剥离合成树脂制吹塑成形容器。
发明内容
本发明当中,技术方案1所述的发明的机构在于,通过吹塑成形,包括形成有定形的外壳的合成树脂制的外层,和该外层剥离自如地叠层该且形成有内袋的挠性合成树脂制的内层,以及纵带状的一对粘接带,其中,这对粘接带把外层和内层在整个高度范围内粘接固定,并使其关于容器的中心线大致对称,其位置避开在外层上形成的使外部空气侵入外层与内层之间的吸气孔,粘接带围绕容器的中心轴在相对分模线的位置大致成90°的位置上形成,这样,以分模线为界,使一对粘接带位于相反侧,并且在靠容器的底部的吹塑组合金属模具的挟断部挟断为扁平而形成的封底部处,使两个粘接带的下端缘对接状地处于相向位置,把吸气孔相对容器的中心轴大致轴对称地设在上述口筒部的分模线附近的两处的外层部分上。
通过技术方案1所述的上述构成,由于容器靠具有通常的挟断部结构的吹塑金属模具,也就是吹塑成形组合金属模具来吹塑成形,所以在底部所形成的作为脊缝部的封底部,与通常的吹塑成形品同样,成为较低的突出高度的突条状。
这样一来,由于该封底部的体积,与通常的吹塑成形品的封底部同样,足够地小,所以可以迅速且充分地实现容器脱模时的对封底部的冷却。
由于两个粘接带使其下端缘位于底部的封底部,所以在该粘接带的下端缘位于的封底部部分处,在粘接带的下端缘的宽度范围内成为外层与内层牢固地粘接固定的状态。
这里,由于在封底部处使两个粘接带的下端缘对接状地处于相向位置,所以在封底部的中央部处两个粘接带的下端缘位于的部分和两个粘接带之间的整个范围内外层与内层被固定,从而限制外力引起的变形。
该中央部的两个粘接带的下端缘位于的整个范围与封底部的左右端部,对包括外层与内层的叠层体的封底部处的变形发挥节点的功能,即使在封底部的没有粘接带的部分也抑制外层和内层单独的变形,结果,即使在封底部上施加某个力的状态下,也可以对抗该力,可以确实地防止封底部的开裂。
由于通过使粘接带位于封底部的纵长方向的大致中央部,最有效地发挥其作为节点的功能,更有效地抑制外层和内层单独的变形,所以可以增强防止开裂的效果。
由于外部空气从设在分模线附近的吸气孔侵入,所以可以使内层非粘接部的萎缩变形更对称地进行,可以顺利地实现内装物的排出。
技术方案2所述的发明的机构在于,在技术方案1所述的发明的基础上,两个粘接带的下端缘最大错开到其间之内层部分几乎不产生挠曲变形的程度的相向位置。
通过技术方案2所述的上述构成,由于两个粘接带的下端缘的位置,在底部的封底部最大错开到几乎没有挠曲变形的程度的内层部分位于其间的位置,所以在底部的封底部处,靠粘接带粘接固定的外层与内层的宽度不是一个粘接带的宽度,而是两个粘接带错开的下端缘位于的整个范围,可以以封底部的大范围作为粘接固定部分。
上述的粘接固定部分和封底部的左右端部的三处,对包括外层与内层的叠层体的封底部处的变形发挥节点的功能,即使在封底部的粘接固定部分以外的部分,外层和内层单独的变形也被抑制,结果,即使在封底部上施加某个力的状态下,也可以对抗该力,可以防止封底部的开裂,另外,由于可以使较大范围作为粘接固定部分,确实地发挥作为节点的功能,有效地抑制外层和内层单独的变形,所以可以得到足够的开裂防止效果。
底部的封底部处的两个粘接带的下端缘不必非要对准其一部分,其错位最大容许到几乎不产生挠曲变形的程度的内层部分的位于其间。
即,在底部的封底部处,两个粘接带的下端缘错位到几乎不产生挠曲变形的程度的内层部分位于其间的场合,因为位于两个下端缘之间的内层部分几乎不产生挠曲变形,所以靠该粘接带粘接固定的部分就成为靠该几乎不发生挠曲变形的内层部分大致不动地结合,不会使靠粘接带粘接固定的封底部部分的姿势胡乱地变形,而是稳定地保持其一定。
再者,底部的封底部处的两个粘接带的下端缘的错位如果扩大到容易挠曲变形的程度的内层部分位于其间的位置,则,由位于其间的内层部分产生的靠各粘接带粘接固定的部分的不动的结合不再可能,封底部的姿势不再稳定。
技术方案3所述的发明的机构在于,在技术方案1所述的发明的基础上,使一方的粘接带的下端缘整个宽度与相反侧的粘接带的下端缘一对一对接状地处于相向位置。
通过技术方案3所述的上述构成,使两条粘接带以分模线为界相互位于相反侧,并且使封底部处的一方的粘接带的下端缘的整个宽度与相反侧的粘接带的下端缘的位置关系为一对一的对接状,在该对接部分,分模线的两侧的外层和该由两外层夹有的内层,在粘接带的下端缘的宽度范围内,成为经由粘接带牢固地粘接固定的状态。
如上所述,内层与外层形成牢固粘接的部分,借此,该粘接部分与封底部的左右端部的三处对包括外层与内层的叠层体的封底部处的变形发挥节点的功能,即使在封底部的没有粘接带的部分处,也抑制外层和内层单独的变形,结果,即使在封底部上施加某个力的状态下,也可以对抗该力,可以确实地防止封底部的开裂。
此外,横跨整个高度范围大致轴对称的粘接带发挥限制内层的萎缩变形的功能,此外靠粘接带,左右对称地出现一对未粘接的内层部分(以下,称为内层非粘接部),可以使该内层非粘接部的萎缩变形对称地进行,可以顺利地实现内装物的排出。
附图说明
图1是表示本发明的第1实施例的局部剖整体立体图。
图2是图1中所示的实施例的俯视剖视图。
图3是图1中所示的实施例的仰视图。
图4是图1中所示的实施例的底部放大纵剖视图。
图5是图4中的封底部的放大图。
图6是表示本发明的第2实施例的仰视图。
图7是图6中的封底部的放大图。
图8是表示本发明的第3实施例的局部剖整体立体图。
图9是图8中所示的实施例的俯视剖视图。
图10是图8中所示的实施例的仰视图。
图11是图8中所示的实施例的底部放大纵剖视图。
图12是图11的封底部的放大图。
图13是图10中的封底部的放大图。
图14是图9中所示的俯视剖视图,是表示内层的变形的推移的说明图。
具体实施方式
下面参照附图说明本发明的实施例。
图1至图5表示根据本发明的容器1的第1实施例,该容器1是把由聚乙烯、聚丙烯等合成树脂材料形成的作为具有必要的自身形状保持能力的外壳体形成的外层2,和由尼龙、乙基乙烯醇异分子聚合物、聚对苯二甲酸乙二醇酯等对外层2相溶性低的合成树脂材料形成挠曲变形自如的袋状的内层3,以及纵细带状的一对粘接带4叠层的吹塑成形容器,其中粘接带4由对外层2和内层3发挥充分的粘接性的粘接性树脂形成,并在容器1的整个高度范围设置。
该容器1的体部6为圆筒形,在体部6的上端直立连接设置且在外周面上刻设有螺纹条的口筒部7的左右的外层2部分上,开设用于把外部空气导入外层2与内层3之间的吸气孔9,两个粘接带4位于该与该吸气孔9成大致中心角90°的部位,在体部6的下端,连接设置具有球弧状凹陷的底壁的底部8。
底部8(参照图3、图4)的构成为:在底壁的周围形成容器1的脚部,在该底壁的下表面中央形成位于分模线5上并大致横跨底壁,且靠吹塑金属模具的挟断部挟断形成的封底部10。
容器1的吹塑成形,把成为外层2的外筒,位于该外筒的内侧的成为内层3的内筒,以及外筒与内筒之间的在对称位置上设置为一对的纵细带状的粘接带4一起挤压而挤压形成型坯,靠吹塑成形组合金属模具把该型坯吹塑成形为容器1。
在该容器1的吹塑成形时,由于型坯对吹塑成形组合金属模具的姿势设定为使一对两条粘接带4位于从其中心轴沿大致吹塑成形组合金属模具的合模方向上,所以如图3中所示,两个粘接带4达到位于底部8的分模线5上的封底部10,因此如图4和图5中所示,作为脊缝部的封底部10的两个粘接带4位于的中央部分处的外层2与内层3靠粘接带4被牢固地粘接固定。
本第1实施例的情况如图3中所示,由于封底部10处的两个粘接带4在相互邻接的位置上错开,所以在封底部10处,通过粘接带4的粘接固定作用,相互不动的外层2部分和内层3部分的宽度为粘接带4的宽度的两倍。
图6和图7表示根据本发明的容器1的第2实施例,使封底部10处的两个粘接带4错开配置到几乎没有挠曲变形的程度的内层部分11位于其下端缘间,因为内层部分11几乎没有挠曲变形的缘故,所以在封底部10处,靠各粘接带4分别粘接固定的部分,靠该几乎没有挠曲变形的内层部分11,几乎连接成整体。
再者,虽然吸气孔9沿圆周方向离两个粘接带4等距离,大致位于分模线5上,但是对顺利且良好地进行内层3的萎缩变形是有利的。
图8至图1 4表示根据本发明的容器1的第3实施例,该容器1是把由聚乙烯、聚丙烯等合成树脂材料,作为具有必要的自身形状保持能力的外壳体形成的外层2,和由尼龙、乙基乙烯乙醇共聚物、聚乙烯对苯二酸酯等对外层2相溶性低的合成树脂材料形成挠曲变形自如的袋状的内层3,以及纵细带状的一对共两条粘接带4叠层的吹塑成形容器,其中粘接带4由对外层2和内层3发挥充分的粘接性的粘接性树脂形成,并在容器1的整个高度范围设置。
该容器1的体部6取为圆筒形,在体部6的上端直立连接设置且在外周面上刻设有螺纹条的口筒部7的左右的分模线5的位置的外层2部分上,开设用于把外部空气导入外层2与内层3之间的吸气孔9。
一对两条粘接带4位于与分模线5大致成中心角90°的部位。
在体部6的下端,连接设置具有球弧状凹陷的底壁的底部8,该底部8(参照图10、图11)的构成为:在底壁的周围形成容器1的脚部,在该底壁的下表面中央形成位于分模线5上并大致横断底壁,且靠吹塑模的挟断部挟断形成的封底部10。
容器1的吹塑成形,把成为外层2的外筒,位于该外筒的内侧的成为内层3的内筒,以及外筒与内筒之间的在轴对称位置上设置一对的纵细带状的粘接带4一起挤压而挤压形成型坯,靠吹塑成形组合金属模具把该型坯吹塑成形为容器1。
在该容器1的吹塑成形时,型坯对吹塑成形组合金属模具的姿势设定为使一对两条粘接带4位于从其中心轴沿吹塑成形组合金属模具的合模方向上,如图10中所示,粘接带4达到位于底部8的分模线5上的封底部10。
此外,如图10和图13中所示,以分模线5为界相向位置的两条粘接带4,在封底部10的大致中央部处,其一方的下端缘的整个宽度一对一地对接状地位于相反侧的下端缘(以下,把这两条粘接体对接状地位置的部分称为对接部12)。
因此,如图12和图13中所示,作为脊缝部的封底部10的对接部1 2部分处的分模线5两侧的外层2和夹在这两个外层2间的内层3靠粘接带4牢固地粘接固定,此外由于其位置位于封底部10的大致中央部,所以在封底部10的整个区域,内层3或外层2的单独的变形受到抑制,结果,可以确实地防止封底部10的开裂的发生。
此外,在本第3实施例中,由于轴对称地使一对吸气孔9位于口筒部7的分模线5上,内压的减少,或者内装物13的减少等引起的内层3的萎缩变形一边发挥在与分模线5大致成中心角90°的位置上所形成的一对粘接带4限制变形的功能,一边靠两个内层非粘接部14对称地进行,所以一边确保流动通路保持顺利的排出性,可以大致用光内装物13(参照图14)。
再者,虽然在上述第1实施例~第3实施例中,是轴对称地在口筒部7的分模线5上配置两个吸气孔9的构成,但是本发明不限于该配置,可以根据使用目的、加工性的难易度选择其个数、部位。
此外,虽然在上述第1实施例~第3实施例中,作为外层2和内层3的两层结构说明了容器1,但是,不言而喻,内层3并不限定于单层构造,也可以例如把在外侧具有与外层2的剥离性的合成树脂制的层,然后在内侧叠层耐内装液性优良的合成树脂制的层。
本发明,由于具有上述构成,所以得到以下所示的效果。
在技术方案1所述的发明中,由于可以迅速而充分地实现对容器的底部的封底部的冷却,所以可以把容器的生产循环提高到与通常的吹塑成形产品相同的程度。
此外,由于没有必要使用考虑金属模具冷却效率的特殊的金属模具,可以使用通常的金属模具,所以可以实现设备费用的大幅度降低。
此外,由于可以在粘接带的宽度或粘接带的带宽以上的宽度范围内,靠粘接带粘接固定封底部的外层与内层,所以可以确实地防止由剥离自如的合成树脂材料形成外层与内层引起的底部的机械强度的降低。
由于通过使粘接带位于封底部的纵长方向的大致中央部,最有效地发挥其作为节点的功能,更有效地抑制外层和内层单独的变形,所以可以增强防止开裂的效果。
由于外部空气从设在分模线附近的吸气孔侵入,所以可以使内层非粘接部的萎缩变形更对称地进行,可以顺利地实现内装物的排出。
在技术方案2所述的发明中,由于可以在粘接带的宽度以上的宽度范围内,靠粘接带粘接固定封底部的外层与内层,所以可以确实且充分地防止通过由剥离自如的合成树脂材料形成外层与内层引起的封底部的机械强度的降低。
在技术方案3所述的发明中,由于可以在封底部处靠粘接带牢固地粘接固定外层与内层,所以可以确实地防止通过由剥离自如的合成树脂材料形成外层与内层引起的封底部的机械强度的降低。

Claims (3)

1.一种吹塑成形容器,通过吹塑成形形成,包括:形成定形的外壳的合成树脂制的外层(2);剥离自如地叠层于该外层(2),形成内袋的挠性合成树脂制的内层(3);以及纵带状的一对粘接带(4),该粘接带(4)把上述外层(2)和内层(3)在整个高度范围内粘接固定,并大致对称于容器(1)的中心轴且避开在上述外层(2)上形成的使外部空气侵入该外层(2)与内层(3)之间的吸气孔(9)的位置,粘接带(4)围绕容器(1)的中心轴在相对分模线(5)的位置大致成90°的位置上形成,这样,以分模线(5)为界,使该一对粘接带(4)位于相反侧,并且在上述容器(1)的底部(8)的由吹塑组合金属模具的挟断部扁平地挟断所形成的封底部(10)处,使上述两个粘接带(4)的下端缘对接状地处于相向位置,把上述吸气孔(9)相对上述容器(1)的中心轴大致轴对称地设在上述口筒部(7)的分模线(5)附近的两处的外层(2)部分上。
2.如权利要求1所述的吹塑成形容器,其特征为:使两个粘接带(4)的下端缘最大错开到其间的内层部分(11)几乎不产生挠曲变形的程度之相向位置。
3.如权利要求1所述的吹塑成形容器,其特征为:使一个粘接带(4)的下端缘整个宽度与相反侧的粘接带(4)的下端缘一对一成为对接状地处于相向位置。
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US7055707B2 (en) 2006-06-06
CA2432061C (en) 2009-12-29
EP2468642A1 (en) 2012-06-27
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EP1459989A1 (en) 2004-09-22
CA2432061A1 (en) 2003-05-08
US20040069735A1 (en) 2004-04-15
KR20040041537A (ko) 2004-05-17
TW200407221A (en) 2004-05-16
TWI262843B (en) 2006-10-01
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EP1459989B1 (en) 2012-06-27
AU2002343776B2 (en) 2008-02-14

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