CN1898073A - 吹塑成形容器 - Google Patents
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- CN1898073A CN1898073A CNA2005800014249A CN200580001424A CN1898073A CN 1898073 A CN1898073 A CN 1898073A CN A2005800014249 A CNA2005800014249 A CN A2005800014249A CN 200580001424 A CN200580001424 A CN 200580001424A CN 1898073 A CN1898073 A CN 1898073A
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Abstract
提供一种吹塑成形容器,该容器的目的在于通过提高吹塑成形的多层可分离型塑料容器的底部的,构成挤压形成的封底部上的底筋的一对筋片的耐剥离强度,强有力地防止多层可分离型塑料容器产生底裂,稳定地保持良好的使用状态。而且,用于达到该目的的手段是用重合压接一对筋片(14)的底筋(15)构成吹塑成形的多层可分离型塑料容器(1)的底部(7)的封底部(13),在底筋(15)上设置多个咬入部(16),该咬入部从一个筋片(14)咬入到另一个筋片,在接近该咬入部(16)的底部分的孔面部分上设置膨出部(18),在两筋片(14)的重合部上形成啮合部(19),提高耐底裂强度。
Description
技术领域
本发明涉及一种由吹塑成形的多层可分离型塑料容器的封底部分的结构。
背景技术
众所周知的多层可分离型塑料容器是一种一般被称为分层型瓶的吹塑成形瓶体,其是将富有挠性的袋状内层以容易剥离的状态层叠在保持自身形状能力很强的外层上构成的。
该吹塑成形的多层可分离型塑料容器,虽然是同时挤压几乎不相溶的外层型坯和内层型坯而后挤压形成层叠型坯,并对该层叠型坯进行吹塑得到的,但由于用吹塑金属模的夹紧封合部压扁挤压形成的封底部分,基本上为几乎不相溶的外层部分和内层部分的重叠结构,所以,很容易在封底部分上产生底裂,不能令人满意。
作为解决这种缺点的现有技术,公知专利文献1(日本专利公报特开平8-216238号)所公开的技术:即通过吹塑金属模的夹紧封合部压成扁平状并挤压成形的封底部作成如下结构,将一对筋片重合压接制成沿分型线呈突条状的底筋,以该底筋为主体,在该底筋上设置多个咬入部,这些咬入部从一对筋片的一方咬入到另一方。
如图6和图7所示,由该专利文献1所公开的现有技术为一种吹塑成形多层可分离型塑料容器1,包括,主体部4,设置在主体部4上端的筒口部5,及设置在主体部4下端的底部7,该容器1通过将封底部13制成为具有高度和宽度的突条状,加大在封底部13上的外层2与内层3的压接面积,另外,通过设置多个咬入部16,不仅更加增大外层2和内层3的压接面积,而且大幅提高针对平行于压接面的剪切力的抵抗力,因此,能获得机械强度高的封底部13,难以发生底裂现象。
但是,上述现有技术中存在如下问题,即通过设置多个咬入部16,加大了封底部13上的外层2和内层3的压接面积,因此,与此相对应地能提高一对筋片14之间的压接量,但是,这样所得到的一对筋片14之间的耐剥离强度不一定足够,人们强烈要求进一步强化封底部13上的一对筋片14之间的耐剥离强度。
特别是,在不需要通过安装在容器1上的泵注出内部容液而是利用容器1的主体部4的挤压变形注出内部容液时,由于在主体部4被挤压变形时,在底部7上作用有很大的弯曲力,所以,必须使封底部13的压接强度达到足以耐受该弯曲力的程度,但是上述现有技术未必能使其耐受住从该主体部4一侧作用的弯曲力,这样会在该封底部13的一对筋片14之间发生剥离,有容器1产生底裂之问题。
发明内容
因此,本发明是为解决上述现有技术中的问题而提出的,其目的是将提高吹塑成形的多层可分离型塑料容器的底部的,由挤压形成,构成封底部上的底筋的一对筋片的耐剥离强度作为技术课题,并且可强有力地防止产生多层可分离型塑料容器的底裂现象,良好的使用状态能稳定地获得保持。
在解决上述技术问题的本发明中,本发明技术方案1的特征在于:
为吹塑成形的多层可分离型塑料容器;
在外层上开设有吸气孔;
将通过吹塑金属模的夹紧封合部压扁挤压形成的底部的封底部,构成为通过重合压接一对筋片形成突条状的底筋的结构;在该底筋上横向排列配置有多个横孔状的咬入部,该咬入部从重合的一对筋片的一方咬入到另一方;
在该咬入部的底部分附近的孔面部分上设置膨出的膨出部,该膨出部的高度尺寸在能勉强拔出形成咬入部的吹塑金属模的销子的范围内。
该技术方案1所记载的发明,通过重合压接一对筋片形成突条状的底筋,以该底筋构成封底部,为沿压接方向以外层、内层、内层、外层的顺序层叠的壁结构,由于其为具有高度和宽度的突条结构,所以,具有很大的压接面积,因此,即使在互溶性差的外层和内层之间也能获得很大的压接强度。
由于在底筋上形成的咬入部为从一个筋片咬入到另一个筋片的结构,所以,底筋上的外层和内层的重合面,在该咬入部呈凹凸状,因此,增大了重合面积,提高了压接强度,而且,对于平行于压接面主体部分的剪切力起到了提高抵抗力的作用。
咬入部是因强大的推压力使底筋产生局部推压变形而形成的,所以,在咬入部附近的底筋部分上作用有强大的推压力,因此,咬入部上的外层和内层被强有力地压接着,具有很强的压接强度。
另外,位于咬入部周围的树脂材料,由于朝向膨出部的部分被推压位移比其它部分大,所以,由于位移量的不同,在位于咬入部周围的两筋片的重合面上形成啮合部,该啮合部相对两筋片的剥离方向呈咬边状弯曲。
这样一来,由于啮合部在两筋片的剥离方向上起到了相互啮合的咬边的作用,所以,能强有力地阻止两筋片剥离。
而且,在分离形成咬入部的吹塑金属模的销子时勉强拔出销子,由于封底部树脂材料的温度在其能发挥自己恢复由于勉强拔出而引起的变形的粘弹性的范围内,所以,能可靠地形成啮合部。
如技术方案1所述,本发明技术方案2的特征在于,仅在咬入部的上侧设置膨出部。
如本发明技术方案2所述,由于仅在咬入部的上侧形成膨出部,所以,能使该膨出部的膨出高度足够大,另外,由于在咬入部的上侧存在有大量的树脂材料,所以,能形成啮合程度高的啮合部。
如技术方案1或2所述,本发明技术方案3的特征在于:将咬入部的底部分制成足够薄的平板状。
如技术方案3所述,由于咬入部的底部分,即压接部,其形状为足够薄的平板状,所以,对形成该压接部的树脂材料来说,吹塑金属模能对其作用足够强大的推压力,该推压力作为压接力有效且强有力地作用在于压接部上形成的,树脂材料的外层和内层的压接面上。
即,咬入部的压接部,其尺寸(面积)越大,还有其厚度越薄,形成该压接部的树脂材料的移动越困难,因此,由吹塑金属模作用强大的推压力,该推压力能有效地起到压接外层和内层的压接力的作用。
再有,由于压接部为足够薄的平板状,所以,在封底部冷却硬化时几乎不产生收缩,另外,即使从周围作用有收缩变形力,也能凭借压接部整体的弯曲变形来吸收该变形力,因此,能阻止在压接部上出现剥离现象。
如技术方案3所述,本发明技术方案4的特征在于:与咬入部的底部分相连接地设置膨出部。
如技术方案4所述,能并不大幅地增加咬入部的容积,而使咬入部的压接部的尺寸仅多出膨出部的膨出部分。
如技术方案1、2、3或4所述,本发明技术方案5的特征在于:将咬入部制成横向长的长圆孔状。
如技术方案5所述,咬入部的压接部也为横向长,因此,压接部的尺寸为合理的大小,另外,对于沿一对筋片的重合面上下方向作用的剪切力,由于使其与宽度大的孔壁面对向所以,对于该剪切力能发挥强大的抵抗力。
如技术方案1、2、3、4或5所述,本发明技术方案6的特征在于:将咬入部设置成上下2排且呈交错状。
如技术方案6所述,并不无理地缩小横向邻接的咬入部的间隔,而是在沿分型线的底筋的全宽范围内,大致均等地配置咬入部。
如技术方案1、2、3、4、5或6所述,本发明技术方案7的特征在于:交替地转换咬入部的咬入方向。
如技术方案7所述,由于相邻的咬入部的咬入方向是相对的,所以,在形成咬入部时,附近的外层和内层被强力地拉伸,产生很大的延伸变形,所以,增大了外层和内层的压接面积,而且,更加强有力地压接外层和内层,因此能提高作为整个封底部的压接强度。
另外,对于压接面的主体部分,由于咬入部交替地位于相对的一侧,所以,为两筋片通过多个咬入部的作用在压接面的主体部分的两侧呈相互啮合的状态,因此,在结构上提高了两筋片的结合强度。
本发明由于为上述结构,所以,具有以下效果:
如本发明技术方案1所述,底筋上的外层和内层的重合面由咬入部而成为凹凸状,因此,增大了重合面积,提高了压接强度,而且,针对平行于压接面的主体部分的剪切力起到了提高抵抗力的作用。
另外,在与咬入部的膨出部相对应的两筋片的重合面上,形成有相对两筋片的剥离方向弯曲成咬边状的啮合部,由于该啮合部起到在两筋片的剥离方向上啮合咬边的作用,所以,能强有力地阻止两筋片的剥离,因此,能强有力地阻止底裂现象的出现。
如技术方案2所述,能形成啮合程度大的啮合部,因此,能使防止底裂的力更加强大。
如技术方案3所述,由于来自吹塑金属模的销子的推压力作为压接力有效且强有力地确实作用在咬入部的压接部上,所以,该压接部上的外层和内层的压接强度极其强大,因此,能提供不会底裂的机械强度稳定的底部。
另外,咬入部的压接部,由于其厚度足够小,所以,几乎不会受到冷却硬化时的收缩变形力的影响,因此,可以稳定强力地维持外层与内层之间的层叠结构,以稳定地保持牢固的压接状态。
如技术方案4所述,由于能并不大幅地增加咬入部的容积,而使咬入部的压接部尺寸仅多出膨出部的膨出部分,所以,不会使整个封底部的机械强度降低,能提高压接部的压接强度。
如技术方案5所述,由于咬入部的压接部的尺寸能为合理的大小,而且,针对沿一对筋片的重合面上下方向作用的剪切力,使其与宽度大的孔壁面相对,所以,对于该剪切力能产生强大的抵抗力,因此,对底裂能产生更强有力的抵抗力。
如技术方案6所述,由于将咬入部大致均等且合理地配置在沿分型线的底筋的全宽范围内,所以,能达到在底筋的整个区域上均等地强化耐剥离强度和压接强度的目的,因此,能保持底筋稳定的压接安装。
如技术方案7所述,由于相邻的咬入部的咬入方向为相反的,所以,两筋片为相互咬入到另一方的啮合状态,并且,加强了咬入部上的外层和内层的压接力,再有,增加了封底部上的外层和内层的压接面积,并且进一步提高了封底部上的外层和内层的耐剥离强度以及压接强度。
附图说明
图1是本发明实施形式的整体主视图。
图2是剖开图1所示的实施形式的一部分的整体侧视图。
图3是图1所示的实施形式的整体仰视图。
图4是图1所示的实施方式的,在紧挨分型线位置纵剖的底部放大纵剖主视图。
图5是图1所示实施方式的,表示封底部的详细结构的主要部分放大纵剖侧视图。
图6是现有技术的整个容器的主视图。
图7是图6所示的容器的,表示封底部的详细结构的主要部分放大纵剖侧视图。
具体实施方式
以下,参照附图对本发明的实施方式进行说明。
图1是本发明所述容器1的主视图,图2是侧视图,图3是仰视图,容器1是通过层叠(参照图2)外层2和内层3形成的吹塑成形容器,外层2是由聚乙烯、聚丙烯等合成树脂材料制成的,其具有必要的保持自己形状的能力;内层3是由尼龙、乙烯-乙烯醇共聚物、聚对苯二甲酸乙二酯等与外层2相溶性差的合成树脂材料制成的,其呈能自由弯曲变形的袋状。
该容器1的主体部4呈圆筒状,在主体部4的上端设有相连着的筒口部5,在筒口部5的外周面上刻有螺纹,在筒口部5的前后外层2部分上设有吸气孔6,该吸气孔6用于将外气导入到外层2和内层3之间,在主体部4的下端设有与之相连的底部7,该底部7具有圆形的底壁10。
底部7(参照图3、图4)由以下部分构成:位于周边,构成容器1的支承部的支承壁8;被该支承壁8所包围的,凹陷到容器1内的底壁10;与该底壁10连成一体且位于分型线上,横穿底壁10的封底部13。
支承壁8(参照图2、图3)为壁结构,其将外侧的大致直立的圆筒状壁部分与在内侧的下方,直径扩大的圆锥筒状部分的下端之间连接成圆弧状,在分型线所处的部分上形成切下一部分的凹坑部9。
底壁10(参照图2、图3、图4)由以下部分构成:与支承壁8内周缘连接的呈球冠状的斜面部11;厚壁的***部12,该***部12沿分型线横穿该斜面部11的中央部,形成长轴沿分型线的大致椭圆球冠状的拱顶结构,并向容器1的内侧弯曲凹陷。
封底部13(参照图3、图4、图5)的结构为:以其两端与支承壁8的凹坑部9相连接的状态,横穿并位于底壁10的***部12的中央,在将型坯吹塑成容器1时,通过从前后将该型坯压成扁平状而挤出获得一对筋片14,将该对筋片14原封不动地重合压接形成突条状的底筋15,并将该底筋15作为主体,在该底筋15的下端面并在该底筋15的大致全长方向上作为型坯的挤出痕迹残留有挤出片20。
在底筋15上,从一个筋片14咬入另一筋片14的横孔状的咬入部16以比筋片14的壁厚深且比底筋15的厚度稍小一点的深度,使凹陷方向交替地变换,且形成上下2排横向排列交错状。
另外,封底部13为沿分型线横穿底壁10的筋板结构,能可靠地防止在吹塑成形完成后,由于随着时间的流逝而产生的收缩变形引起的底壁10的中央部分下垂变形现象。
各咬入部16为横向长的长圆孔状,如图4所示,以上下相互堵住横向相邻的咬入部16之间的间隙的方式配置成上下交错的2排,其纵剖面结构如图5所示,在与底部分相连的上侧部分上,形成有膨出部18,该膨出部18的膨出高度在能勉强拔出吹塑金属模的销子的高度范围内。
这样一来,由于咬入部16为在其上侧具有膨出部18的结构,所以,如图5所示,位于该膨出部18的正上方的树脂材料被推向上方,因此,在咬入部16的正上部分形成两筋片14的重合面弯曲成咬边结构的啮合部19,该啮合部19能有力地阻止两筋片14的剥离。
作为各咬入部16的底部分的压接部17虽然为足够薄的平板状,但由于咬入部16的形状为横向长的长圆孔状,且设有膨出部18,所以,可不勉强地将尺寸(面积)设定的较大。
另外,压接部17的厚度最好在能保持必要机械强度的范围内尽量薄,优选为底筋15厚度的10分之1~20分之1左右。
使用容器1,进行图6和图7所示的现有技术与图1至图5所示的本发明的实施方式的耐底裂强度的比较,该容器1的外层2由低密度聚乙烯制成,另外,内层3由尼龙制成,全高为154.3mm、主体部外径为44.8mm、底筋15的高度为5mm、宽为38mm、厚为1.8mm。
在本发明的实施方式中,咬入部16的数量是5个,压接部17的总面积是20.32mm2,膨出部18的膨出高度是0.1mm,与此相比,在现有技术中,咬入部16的数量是13个,压接部17的总面积是1.638mm2。
当沿分型线的方向对本发明实施方式中的容器1的底部7及现有技术的容器1的底部7以20mm/min作用推压力时,在本发明实施方式的情况下,作用有5.64Kg的推压力时产生3.48mm的变形量,发生底裂现象,与此相对应,在现有技术的情况下,作用有3.94Kg的推压力时产生2.14mm的变形量,发生底裂现象。
该比较实测结果表明,图示的本发明的实施例与相同图示的现有技术的例子相比较,耐底裂强度提高了将近1.5倍。
Claims (7)
1.一种吹塑成形的多层可分离型塑料容器,在外层(2)上设有吸气孔(6),通过吹塑金属模的夹紧封合部压扁然后挤压形成的底部(7)的封底部(13),由重合压接一对筋片(14)而形成的突条状的底筋(15)构成;在该底筋(15)上横向排列配置有多个横孔状的咬入部(16),该咬入部(16)从重合在一起的一对筋片(14)的一方咬入到另一方;在该咬入部(16)的底部分附近的孔面部分上设置膨出的膨出部(18),该膨出部(18)的高度尺寸设定为能使形成咬入部(16)的吹塑金属模上的销子勉强拔出的范围内。
2.如权利要求1所述的吹塑成形容器,仅在咬入部(16)的上侧设置膨出部(18)。
3.如权利要求1或2所述的吹塑成形容器,将作为咬入部(16)的底部分的压接部(17)制成足够薄的平板状。
4.如权利要求3所述的吹塑成形容器,与咬入部(16)的底部分相连地设置膨出部(18)。
5.如权利要求1、2、3或4所述的吹塑成形容器,将咬入部(16)制成横向长的长圆孔状。
6.如权利要求1、2、3、4或5所述的吹塑成形容器,将咬入部(16)设置成上下2排并呈交错状。
7.如权利要求1、2、3、4、5或6所述的吹塑成形容器,使咬入部(16)的咬入方向交替变换。
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2005
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- 2005-09-28 WO PCT/JP2005/017800 patent/WO2006035795A1/ja active Application Filing
- 2005-09-28 CN CNB2005800014249A patent/CN100537190C/zh active Active
- 2005-09-28 EP EP05788169A patent/EP1803541B1/en active Active
- 2005-09-28 US US11/547,445 patent/US7614515B2/en active Active
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JP2006103692A (ja) | 2006-04-20 |
EP1803541B1 (en) | 2012-06-13 |
US7614515B2 (en) | 2009-11-10 |
KR20070072424A (ko) | 2007-07-04 |
US20080302757A1 (en) | 2008-12-11 |
EP1803541A1 (en) | 2007-07-04 |
JP4535259B2 (ja) | 2010-09-01 |
CN100537190C (zh) | 2009-09-09 |
KR101136291B1 (ko) | 2012-04-19 |
WO2006035795A1 (ja) | 2006-04-06 |
EP1803541A4 (en) | 2009-12-23 |
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