CN1128974A - 合成树脂制管体的封口部成型方法和成型装置、 - Google Patents

合成树脂制管体的封口部成型方法和成型装置、 Download PDF

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CN1128974A
CN1128974A CN95190463A CN95190463A CN1128974A CN 1128974 A CN1128974 A CN 1128974A CN 95190463 A CN95190463 A CN 95190463A CN 95190463 A CN95190463 A CN 95190463A CN 1128974 A CN1128974 A CN 1128974A
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CN1076691C (zh
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藤田守
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Yoshino Kogyosho Co Ltd
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    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/14—Closing collapsible or resilient tubes, e.g. for tooth paste, for lighter fuel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/43—Joining a relatively small portion of the surface of said articles
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    • B29C66/73—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
    • B29C66/739—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 material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
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Abstract

将压塌成扁平的管体1的端部2的突出端部3加热熔融，将该突出端部3在体积压缩缩小至0.65-0.80倍的条件下挤压成型成所希望形状的封口部5，由此在提高封口部5的密度的同时，使封口部5成型成所希望的形状。

Description

合成树脂制管体的封口部成形方法和成形装置
技术领域
本发明涉及将合成树脂制管体的一个端部压塌成扁平、进行熔接固定而形成封口部的成形方法以及实施该成形方法的成形装置。
背景技术
仅用合成树脂材料形成管体中部的合成树脂制管容器的密封端部的成形，是将管体的敞开端部用夹紧夹具从前后压塌成扁平，从夹紧夹具突出的突出端部用加热器加热熔融后，用封口模具从前后进行挤压熔接而形成封口。
因为这种以往的合成树脂制管容器的封口部的成形仅是利用加热器加热形成熔融状态的突出端部，然后用封口模具将该突出端部从前后挤压熔接，所以如图15所示，在管体1的下端(在图中是上端)形成的封口部5在其两侧端部附加形成向侧方突出的突出侧端部分4。
另外，利用封口模具进行熔融的突出端部的挤压因为仅从前后夹住，所以如上所述，在封口部5的两侧端部附加形成突出侧端部分4的同时，如图16所示，已熔融的突出端部的一部分从封口模具之间挤出到上方，在封口部5的端缘形成不规则的厚壁。
这种以往的封口部成形因为仅用封口模具将通过加热成为熔融状态的突出端部从前后夹住，所以熔融状态的合成树脂材料的一部分较自由地流动移位，因此有所成形的封口部的形状不能一定化的问题。
另外，突出侧端部分因为从是管容器的主体即中部突出位于侧方上，所以在管容器操作时，该突出测端部分挂住指尖等，有增加损伤或产生不快感觉的问题。
而且，因为封口部仅利用封口模具从前后夹住而成形成最终形状，所以其形状限定于图15所示的形状，因此不能形成有兴趣的形状，或者不能附带形成组装其他吊钩等的有效结构部分，作为商品有不能得到有兴趣的管容器的问题。
再有，以往的封口部因为仅仅将是管体成形材料即合成树脂材料熔融而粘合，所以其粘合强度即密封强度不一定足够，尤其是在容纳粘度较高的内容物的情况下，在挤出内容物使用时，存在封口部的封口剥开，内容物从封口部漏出的问题。
另外，在为了提高管体的气体阻挡性而使用气体阻挡性高的合成树脂材料制成层合结构的管体的情况下，对封口部进行加热熔接处理时，这种气体阻挡性高的合成树脂材料因热而分解起泡，形成连续气泡，存在内容物通过该连续气泡部分从封口部渗出的问题。
因此，本发明是必须解决上述已有技术中的问题的发明，以利用加热熔接操作提高所成形的封口部的密度作为技术课题，而且以在提高所成形的封口部的粘合强度和密封性的同时，使其形状达到所希望的一定形状为目的。
发明的公开
解决上述技术课题的本发明的第一方法手段在于用夹紧夹具将合成树脂制的管体的端部压塌成扁平，将该管体的从夹紧夹具突出的突出端部加热熔融化，在使突出端部的体积压缩缩小成0.65-0.80倍的条件下将该加热熔融的突出端部挤压成形成所希望形状的封口部。
另外，本发明的第二方法手段在于用夹紧夹具将合成树脂制的管体的端部压塌成扁平，将该管体的从夹紧夹具突出的突出端部加热熔融，在缩小抑制合成树脂材料的分解起泡的条件下，将该加热熔融的突出端部挤压成形成所希望形状的封口部。
将加热熔融的突出端部的两突出侧端部分折入中央部分后，可以将突出端部挤压成形成没有向侧方突出部分的封口部，此时，可以将两突出侧端部分从距离用夹紧夹具压塌成扁平的端部的侧端边缘0-0.5(mm)左右的中心附近处折入。
另外，解决上述技术课题的本发明的结构手段在于具有将合成树脂制管体的端部压塌成扁平的一对夹紧夹具，将从该夹紧夹具突出的管体的突出端部加热而熔融的加热器，将加热熔融的突出端部的两突出侧端部分弯折到中央部分的弯折装置，将两突出侧端部分弯折到中央部分的突出端部挤压成形成所希望形状的封口部的挤压成形装置。
弯折装置可以由外型夹具和内型夹具构成。所述外型夹具可在一个夹紧夹具上沿压塌方向滑动，在与突出端部相对的前面上具有塌陷成矩形的型面部分，该型面部分具有与压塌成扁平的端部相等或者稍狭小的宽度；所述内型夹具可在另一个夹紧夹具上沿压塌方向滑动，在与突出端部相对的前面上具有对侵入外型夹具的塌陷型面部分内的突出端部的两突出侧端部分的弯折变形没有阻碍宽度的突出型面部分。
在该弯折装置中，使外型夹具的塌陷型面部分的宽度比压塌成扁平的端部小1mm以下是有效的。
挤压成形装置可以由具有凹状成形型面的阴模夹具和具有凸状成形型面的阳模夹具构成。具有凹状成形型面的阴模夹具可在一个夹紧夹具上沿压塌方向滑动，在与突出端部相对的前面上具有与两突出侧端部分弯折的突出端部相等或稍大的宽度的凹状成形型面；具有凸状的成形型面的阳模夹具可在另一个夹紧夹具上沿压塌方向滑动，在与突出端部相对的前面上具有以不发生飞边的程度紧密地嵌入上述阴模夹具的凹状成形型面内的凸状成形型面。
下面说明本发明的作用。
用具有平坦挤压面的一对夹紧夹具将合成树脂制管体的端部夹持在该夹紧夹具上，使端部的端部即突出端部成突出状态，从前后压塌成扁平状态，利用加热器将在该夹紧夹具上突出的突出端部加热熔融。
通过利用加热器的加热熔融，突出端部的整个形状成为成为稍微弯倒状态，使该加热熔融至整个形状稍微弯倒状态的突出端部整体位于一定的型空间内，以此状态将其体积压缩缩小成0.65-0.80倍，挤压成形成所希望形状的封口部。
因为封口部是将加热熔融的突出端部在其体积压缩至0.65-0.80倍的条件下进行成形，所以根据从该突出端部向封口部的体积压缩缩小程度，在提高密度的同时，以强力挤压熔接部分的状态达到封口部的熔接。
另外，在以聚酰胺树脂、乙烯-乙烯醇共聚物树脂以及聚偏氯乙烯系共聚物树脂等气体阻挡性高的合成树脂材料作为阻挡层，使管体具有层合结构的埸合，由于突出端部的加热熔融，气体阻挡性高的合成树脂材料发生分解起泡，在该加热熔融的突出端部向封口部挤压成形之际，因为以缩小抑制气体阻挡性高的合成树脂材料发生分解起泡的强度施加挤压力，所以充分抑制缩小了在突出端部发生的分解起泡，在没有连续气泡发展的条件下成形成封口部。
为了使由加热器加热熔融的突出端部的两突出侧端部分从压塌成扁平的端部向侧方弯倒成突出的形状，在利用挤压成形装置进行该突出端部向封口部的挤压成形之前，利用弯折装置将突出端部的两突出侧端部分弯折在中央部分上，使突出端部形成没有从端部向侧方突出部分的状态，由此使用挤压成形装置，使被成形成最终形状的封口部成形成完全没有从端部向侧方突出部分的形状成为可能。
将两突出侧端部分弯折到中央部分的突出端部挤压成形成封口部的挤压成形装置，因为必须使该突出端部的体积压缩缩小至0.65-0.80倍，或者必须使充分缩小抑制气体阻挡性高的合成树脂材料发生的分解起泡的挤压力作用于突出端部，所以其形成的成形空间理所当然地成为被成形的封口部不发生飞边的紧密空间，封口部被挤压成形成按照该成形空间形成的所希望的形状。
在突出端部向封口部挤压成形时，突出端部的体积压缩缩小程度达到0.65-0.80倍是为了限制从该突出端部向封口部挤压成形用的挤压力，若压缩缩小程度达到0.65倍以上，由于发生飞边等，在赋形性变差的同时，被成形的封口部的前后厚度往往变得极薄，所以有封口部整体强度降低的担心，另外，若压缩缩小程度在0.80倍以下，挤压力不够，难以达到熔融粘合力的充分强化。
附图的简要说明
图1是表示合成树脂制管体的端部的图，(a)是俯视图，(b)是端部部分的正视图。图2是表示将图1所示的管体的端部压塌成扁平的操作的图，(a)是俯视图，(b)是正视图。图3是表示对图2所示的压塌后的突出端部进行加热操作的图。图4是表示图3所示的加热操作接近结束状态的图，(a)是俯视图，(b)是正视图。图5是图4的状态的测面图。图6是表示对图4所示的加热熔融处理后的突出端部进行弯折操作的图，(a)是俯视图，(b)是正视图。图7是表示对图6所示的弯折处理后的突出端部进行挤压成形操作的图，(a)是俯视图，(b)是除去阳模夹具的正视图。图8是表示已成形的封口部的一例的图。图9是图8所示的封口部的放大纵剖面图。图10是表示在单层结构管时，本发明和以往例的封口部的爆裂强度特性的特性曲线图。图11是表示在层合结构时，本发明和以往例的封口部的爆裂强度特性的特性曲线图。图12是表示供抗拉强度试验用的管片结构的整体斜视图。图13是表示在单层结构管时，本发明和以往例的封口部的抗拉强度特性的特性曲线图。图14是表示在层合结构时，本发明和以往例的封口部的抗拉强度特性的特性曲线图。图15是表示在合成树脂制管中的以往的封口部的结构的正视图。图16是图15所示封口部的放大纵剖面图。
实施发明的最佳方式
下面，参照附图说明本发明的一个实施例。
图1(a)是合成树脂制管体1的俯视图，图1(b)是其端部2部分的正视图。
如图2所示，用一对夹紧夹具9将图1所示的管体1的端部2夹持在夹紧夹具9上，使突出端部3成突出状态，若从前后压塌成扁平，如图2(a)所示，由于弹力突出端部3的两侧部分呈稍微张开状态，如图2(b)所示，以与已压塌成扁平的端部2大致相等的宽度在前后成为扁平。
如图3所示，将管体1以用夹紧夹具9压塌成扁平的原状放置在加热器10的正下方，该加热器装有用于限制辐射热放射方向的罩11，将从夹紧夹具9突出的突出端部3加热熔融。
通过用该加热器10加热，如图4所示，突出端部3变成半熔融状态而弯倒变形，如图4(a)所示，在两侧部分由弹力而引起的张开消失的同时，如图4(b)所示，突出高度降低到1/2至1/3，在两侧方突出附加形成突出侧端部分4，而且如图5所示，前后方向的厚度增加。
这种利用加热器10对突出端部3的加热处理，根据构成管体1的合成树脂材料的物性和结构的不同，需要调整设定其加热温度和加热时间，通常，应该将突出端部3上端边缘加热至180-250℃，加热8秒-10秒左右。
若利用加热器10对突出端部3的加热熔融处理结束，如图6所示，直接利用弯折装置12将突出端部3的两突出侧端部分4弯折在中央部分上。
弯折装置12由外型夹具14和内型夹具13构成，该外型夹具沿压塌方向可滑动地设置在一个夹紧夹具9上，该内型夹具13以沿压塌方向可滑动且可进入外型夹具14内的方式设置在另一个夹紧夹具9上；外型夹具14在与突出端部3相对的前面上具有塌陷成矩形的型面部分，该矩形与压塌成扁平的端部2的宽度相等或者稍狭(最大1mm左右)，该内型夹具13在与突出端部3相对的前面上具有突出型面部分，该突出型面部分具有对进入到外型夹具14的型面部分内的突出端部3的两突出侧端部分4的弯折变形无阻碍的宽度，即比外型夹具14的型面部分的宽度小2倍以上的突出侧端部分4的壁厚。
利用该弯折装置12使突出侧端部分4向中央部分的弯折成形进行如下；相对于在夹紧夹具9上的已熔融变形的突出端部3，使内型夹具13和外型夹具14与各自的左右方向的中心呈一致状态沿相互接近的方向前进，通过这种相互接近的前进动作，使内型夹具13的突出型面部分进入外型夹具14的型面部分内，借助该进入动作完成两突出侧端部分4的弯折。
将两突出测端部分4弯曲的弯折装置12，其内型夹具13和外型夹具14同时被冷却，而且利用该弯折装置12进行突出侧端部分4的弯折成形处理时间是0.2-0.3秒左右的短时间，如图6(a)所示，内型夹具13和外型夹具14接触，要尽可能地仅完成突出侧端部分4，突出侧端部分4的弯折处是从压塌成扁平的端部2的侧端边缘起0-0.5mm左右中心附近处。
这是为了原封不动地保持突出端部3的熔融状态而仅将两突出侧端部分4弯折成形，直至突出端部3向随后的挤压成形装置15组装，维持该突出侧端部分4的弯折状态，从而能将仅两突出侧端部分4弯折的熔融状态的突出端部3圆滑地嵌入挤压成形装置15的阴模夹具17的成形型面内。
即，使已冷却的弯折装置12仅接触突出测端部分4，通过将该突出侧端部分4弯折成形，使突出侧端部分4以外的突出端部3保持熔融状态，仅突出侧端部分4的表面部分局部冷却固化，只短时间维持突出侧端部分4的弯折状态，在突出端部3组装到挤压成形装置15时，借助突出端部3的其他部分的热量，突出侧端部分4的冷却固化表面部分回复到熔融状态，由此在无障碍地完成突出端部3向挤压成形装置15组装的同时，能够良好地完成利用挤压成形装置15进行的挤压成形。
利用弯折装置12将两突出侧端部分4弯折的突出端部3，如图7所示，迅速地用挤压成形装置15挤压成形成所希望形状的封口部5 。
挤压成形装置15由具有凹状成形型面的阴模夹具17和具有凸状成形型面的阳模夹具16构成。该阴模夹具17可在一个夹紧夹具9上沿压塌方向滑动，在与突出端部3相对的前面上具有凹状成形型面，该凹状成形型面具有与两突出侧端部分4弯折的突出端部3相等或者稍大的宽度(但是，不比压塌成扁平的端部2的宽度大)；该阳模夹具16可在另一个夹紧夹具9上沿压塌方向滑动，在与突出端部3相对的前面上具有凸状成形型面，该凸状成形型面以不发生飞边程度紧密地嵌入上述阴模夹具17的成形型面内。
在图示实施例的情况下，阳模夹具16和阴模夹具17的成形型面的宽度设定为等于压塌成扁平的端部2的宽度，所形成的成形型空间为将平天井面的两侧端部分以较大的曲率半径斜切成圆弧状的形状，阴模夹具17的成形型面的宽度因为比两突出侧端部分4弯折的突出端部3的宽度大，所以突出端部3向阴模夹具17的成形型面内的嵌入可以简单且圆滑地实现。
利用该挤压成形装置15将突出端部3挤压成封口部的挤压成形按以下方式完成；使阳模夹具16、阴模夹具17以及突出端部3的中心前后成一致状态，通过相对移动，借助阳模夹具16使突出端部3压入阴模夹具17的成形型面内，边以约30kgf程度的挤压力进行挤压，边用阳模夹具16和阴模夹具17进行冷却。
利用挤压成形装置15对突出端部3的挤压处理时间是约为0.5秒，在利用这种挤压处理将突出端部3成形成封口部5的同时，树脂温度被冷却到60-80℃左右，已成形的封口部5脱离挤压成形装置15后，通过吹冷却空气等冷却到常温。
图8表示利用图7所示的挤压成形装置15成形的封口部5的外观形状的正视图，封口部5不从端部2向侧面突出，流畅地连续下去，其两侧端边缘部分斜切成圆弧状，上端边缘形成直线形的平坦边缘。
图9以放大纵剖面图表示按照本发明成形的层合管体1的封口部5的一个例子，该管体1是将作为阻挡层的乙烯-乙烯醇共聚树脂制的中间层7置于低密度聚乙烯树脂制的内层6和外层8之间(并且在各层间有粘合层)层合而成。若与如图16所示的用以往技术成形的相同管体1的封口部5进行比较就可看出，与在敞开状态仅使用于调整形状的挤压力进行作用的以往例不相同，在所希望形状的密闭的空间内施加一定的挤压成形力的本发明中，其断面面积变小，在此状态下，封口部5的树脂密度提高。
图10至图14表示按照本发明成形的封口部5和按照以往技术成形的封口部5强度比较试验结果。图10表示低密度聚乙烯树脂单层制的管体、分别使用100个试样的爆裂强度试验结果，对本发明产品来说，如爆裂强度特性a所表明的那样，封口部不发生爆裂，与此相反，如爆裂强度特性a′所示，以往制品的封口部一部分发生爆裂，由此可知，本发明充分提高了封口部5的密度强度(30％左右)。
图11表示图9所示层合管容器、分别使用100个试样的爆裂强度试验结果。从以往例的爆裂强度特性a′和本发明的爆裂强度特性a可看出，按照本发明的封口部5的密封强度充分提高。另外，在爆裂强度特性a中，虽然极少数在封口部发生爆裂，但认为这是偶尔在试样中内层6的壁厚有偏厚偏薄之处，由于局部应力集中而造成的。
图13和图14是表示已成形的封口部5的抗拉强度试验结果。如图12所示，将已成形的管容器的封口部5的一部分按宽和长15mm切断形成作为试验片的管片1′，沿箭头方向、以300mm/分的拉伸速度拉伸该管片1′，进行抗拉强度试验。
图13和图14与爆裂强度试验情况相同，图13是单层结构的埸合，图14是层合结构的埸合，抗拉强度试验特性b表示本发明，抗拉强度试验特性b′表示以往技术，此抗拉强度也表明本发明充分提高了封口部5的抗拉强度。
工业实用性
本发明因为形成上述结构，所以达到以下所示的效果。
因为加热成熔融状态的突出端部在具有所希望的成形空间的挤压成形装置内挤压成形成封口部，所以可以任意设定被成形的封口部的形状，而且可以将管容器的封口部成形成实用上有利且理想的形状。
由突出端部形成封口部的成形是利用在封闭空间内的挤压成形，在减小体积下完成的，所以所形成的封口部的密度仅以体积减小来提高，在此状态下，封口部的强度提高，并且因为借助所作用的挤压力来提高熔接部分的熔接力，所以提高了熔接封口部分的熔接力，而且能形成熔接强度、即密封强度足够高的封口部。
在具有气体阻挡层的层合管的情况下，因为通过挤压操作抑制缩小因加热熔融而在气体阻挡层中发生的分解起泡，所以所发生的分解起泡的气泡不成长成连续气泡，因此在能可靠地防止发生因气泡存在而引起的密封强度大幅度降低的同时，能够完全防止通过连续气泡从封口部渗出内容物这种不妥情况的发生，可以得到安全且良好的使用形态。

Claims (8)

1.合成树脂制管体的封口部成形方法，其特征在于将用夹紧夹具(9)将端部(2)压塌成扁平的合成树脂制管体(1)的从上述夹紧夹具(9)突出的突出端部(3)加热熔融，将该加热熔融的突出端部(3)在体积压缩缩小至0.65-0.80倍的条件下挤压成形成所希望形状的封口部(5)。
2.合成树脂制管体的封口部成形方法，其特征在于将用夹紧夹具(9)将端部(2)压塌成扁平的合成树脂制管体(1)的从上述夹紧夹具(9)突出的突出端部(3)加热熔融，将该加热熔融的突出端部(3)在缩小抑制合成树脂的分解起泡的条件下挤压成形成所希望形状的封口部(5)。
3.权利要求1或2所述的合成树脂制管体的封口部成形方法，其特征在于将加热熔融的突出端部(3)的两突出侧端部分(4)弯入中央侧后，将上述突出端部(3)挤压成形成没有向侧方的突出部分的封口部(5)。
4.权利要求3所述的合成树脂制管体的封口部成形方法，其特征在于从距用夹紧夹具(9)压塌成扁平的端部(2)的侧端边缘0-0.5mm左右的中心附近处将两突出侧端部分(4)弯入。
5.合成树脂制管体的封口部成形装置，它由将合成树脂制管体(1)的端部(2)压塌成扁平的一对夹紧夹具(9)，将从该夹紧夹具(9)突出的上述管体(1)的突出端部(3)加热熔融的加热器(10)，将加热熔融的上述突出端部(3)的两突出测端部分(4)弯折到中央部分的弯折装置(12)，以及将上述两突出侧端部分(4)弯折到中央部分的突出端部(3)挤压成形成所希望形状的封口部(5)的挤压成形装置(15)构成。
6.权利要求5所述的合成树脂制管体的封口部成形装置，其中弯折装置(12)由外型夹具(14)和内型夹具(13)构成，该外型夹具(14)可在一个夹紧夹具(9)上沿压塌方向滑动，在与突出端部(3)相对的前面上具有塌陷成矩形的型面部分，该矩形型面部分的宽度与压塌成扁平的端部(2)相等或者稍狭；该内型夹具(13)可在另一个夹紧夹具(9)上沿压塌方向滑动，在与上述突出端部(3)相对的前面上具有突出型面部分，该突出型面部分具有对进入到上述外型夹具(14)的塌陷型面部分内的上述突出端部(3)的两突出侧端部分(4)的弯折变形无障碍的宽度。
7.权利要求6所述的合成树脂制管体的封口部成形装置，其中使外型夹具(14)的塌陷型面部分的宽度比压塌成扁平的端部(2)小1mm以下。
8.权利要求5所述的合成树脂制管体的封口部成形装置，其中挤压成形装置(15)由具有凹状成形型面的阴模夹具(17)和具有凸状成形型面的阳模夹具(16)构成，该阴模夹具可在一个夹紧夹具(9)上沿压塌方向滑动，在与突出端部(3)相对的前面上具有与两突出侧端部分(4)弯折的上述突出端部(3)相等或稍大宽度的凹状成形型面；该阳模夹具(16)可在另一个夹紧夹具(9)上沿压塌方向滑动，在与上述突出端部(3)相对的前面上具有以不发生飞边程度紧密地嵌入上述阴模夹具(17)的凹状成形型面内的凸状成形型面。
CN95190463A 1994-04-11 1995-04-04 合成树脂制管体的封口部成形方法和成形装置 Expired - Fee Related CN1076691C (zh)

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WO1995027656A1 (fr) 1995-10-19
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TW342360B (en) 1998-10-11
AU2085595A (en) 1995-10-30
AU676967B2 (en) 1997-03-27
KR100198142B1 (ko) 1999-06-15
EP0701943A4 (en) 1998-10-28
JPH08252862A (ja) 1996-10-01
EP0701943A1 (en) 1996-03-20
CA2164877A1 (en) 1995-10-19
DE69518127D1 (de) 2000-08-31
US5672308A (en) 1997-09-30
CA2164877C (en) 2000-03-14
DE69518127T2 (de) 2000-12-14
JP3412057B2 (ja) 2003-06-03

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