CN1919693B - 自立袋及其制造方法 - Google Patents

自立袋及其制造方法 Download PDF

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Publication number
CN1919693B
CN1919693B CN2006101256379A CN200610125637A CN1919693B CN 1919693 B CN1919693 B CN 1919693B CN 2006101256379 A CN2006101256379 A CN 2006101256379A CN 200610125637 A CN200610125637 A CN 200610125637A CN 1919693 B CN1919693 B CN 1919693B
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China
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mentioned
packaging bag
strengthening part
bag
lateral margin
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CN1919693A (zh
Inventor
佐藤正昭
佐藤正和
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Oshio Industry Co Ltd
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Oshio Industry 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/02—Local reinforcements or stiffening inserts, e.g. wires, strings, strips or frames
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
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    • 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
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    • B29C66/81411—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81423—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being concave
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • 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
    • B29C66/81431—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 comprising a single cavity, e.g. a groove
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • Y10S383/906—Dispensing feature

Abstract

本发明提供一种自立袋，包括收存内容物的包装袋和设置在包装袋上端中部的口具以及包覆包装袋两侧缘外面的由热塑性树脂制成的加强部件，加强部件的下端部，位于包装袋底缘的上方，加强部件的下端部，凸出到下凹口的内侧。本发明的有益效果在于，由于设置了上述加强部件，使本发明的自立袋能良好地保持自立的姿势；由于在包装袋侧缘的下端设置有下凹口，在包装袋两侧缘的上端设置了上凹口，可避免由于消除溢料(毛刺)所造成的制造效率降低；还由于在自立袋上安装口具，提高了保管和搬运的便利性。

Description

自立袋及其制造方法
技术领域
本发明涉及一种带有加强部件的自立袋及其制造方法。
技术背景
日本特开2003-191964号公报，公示过在包装袋两侧缘及上缘，用热塑性树脂加强部件包覆的自立袋。在这种自立袋中，加强部件起包装袋支柱的作用。因此，即使自立袋中填充的内容物量很少，也可防止自立袋在中部折弯或倾倒。
在这种自立袋中，加强部件的下端凸出到包装袋底缘的下方。因此，加强部件下端与载置面碰接，而自立袋的整个底缘不与载置面接触，所以不能使自立袋安稳站立。
发明内容
本发明的目的在于提供一种可安稳自立，功能更全的自立袋及其制造方法。
为了达成上述目的，本发明的一实施例提供一种自立袋，包括收存内容物的包装袋，上述包装袋由多片板的边缘相接合形成袋状，并在上述包装袋的边缘上形成有接合部，和设置在包装袋上部的流通口以及包覆包装袋侧缘外面的加强部件。加强部件由热塑性树脂构成，加强部件的下端，位于与包装袋的底缘相同的位置，或者位于底缘的上方，上述加强部件包覆在上述包装袋侧缘的上述接合部的外面。
本发明的其他实施例提供一种自立袋的制造方法，该自立袋包括收存内容物的包装袋，上述包装袋由多片板的边缘相接合形成袋状，并在上述包装袋的边缘上形成有接合部，和设置在包装袋上部的流通口以及包覆包装袋侧缘外面的加强部件，加强部件由热塑性树脂构成，在包装袋侧缘的下端部设有下凹口，加强部件的下端凸出到下凹口的内侧，上述加强部件包覆在上述包装袋侧缘的上述接合部的外面，该方法包括：形成上述包装袋的工序；和将包装袋的侧缘，配置在第1金属模具的第1凹部，在该第1金属模具内，安装该包装袋的工序；和在上述第1金属模具内安装好包装袋后，在由第1金属模具的第1凹部和第2金属模具的第2凹部构成的空腔内，不让第1金属模具和第2金属模具接触包装袋侧缘的下端，而使两金属模具互相碰接的工序；和将热塑性树脂注射到空腔内，形成加强部件，以包覆包装袋侧缘的工序；以及把流通口安装在包装袋上部的工序。
本发明的有益效果在于，由于设置了上述加强部件，使自立袋能良好地保持自立时的姿势。本发明还由于在包装袋侧缘的下端设置有下凹口，在包装袋两侧缘的上端设置了上凹口，从而可避免由于消除溢料(毛刺)所造成的制造效率降低。本发明还由于在自立袋上安装口具，提高了保管和搬运的便利性。
在本发明的方法中，由于加强部件的上端部凸出于上凹口的上凹口面的上方，因而在形成上缘热熔接部前后的任何时间段，都很容易往包装袋里填充内容物，使制造工艺安排更灵活。
在本发明的方法中，还由于在包装袋的上缘附近，侧缘热熔接部的内缘，不被加强部件包覆，因此在密封包装袋上缘的开口部的时候，可避免第2密封金属模具和加强部件之间的接触。
附图说明
图1是表示本发明实施例包装袋的主视图；
图2是表示本发明实施例自立袋的主视图；
图3是表示本发明实施例自立袋的立体图；
图4是说明制作加强部件方法的说明图；
图5(A)是说明在自立袋上安装口具方法的说明图；
图5(B)是说明在自立袋上安装口具方法的说明图；
图6是表示一种自立袋变形例的主视图；
图7是表示一种自立袋变形例局部的主视图；
图8是表示一种自立袋变形例局部的主视图；
图9是表示一种自立袋变形例的主视图；
图10是表示一种自立袋变形例的主视图。
具体实施方式
以下，参照图1～图3，说明本发明自立袋的一种实施例。
首先，参照图1～图3，说明自立袋1的结构。
如图3所示，自立袋1包括有收存内容物的包装袋2，包覆包装袋2两侧缘10的两个加强部件3，具有用于取出内容物的流通口之口具4。在自立袋1中，包装袋2的内容物通过口具4取至外部。
如图1所示，包装袋2由一张底面板11和一对侧面板12所构成，它是在两侧面板12之间配置底面板11的状态下，通过将各块板互相热熔接而形成的。通过这种热熔接，在包装袋2的外周边缘形成熔接部30。在包装袋2的底部，底面板11沿折线11a向内(图1的上方)折2个折。
在包装袋2侧缘10的下端，通过对底面板11及侧面板12的一部分开槽，形成下凹口13。下凹口13，具有下凹口面13a以及方形面13b。下凹口面13a，沿着与包装袋2侧缘10呈正交的方向延伸；方形面13b，从下凹口面13a到包装袋2的底缘14，顺着圆弧延伸。也就是说，下凹口面13a配置在包装袋2底缘14的上方。
在圆弧状的方形面13b内，热熔接着底面板11和各侧面板12，但两侧面板12之间互不热熔接。为此，在包装袋2填充了内容物的状态下，下凹口13的方形面13b，依靠自立袋1的自重而打开。这时，下凹口13的方形面13b，不朝包装袋2底缘14的下方凸出。因此，整个包装袋2的底缘14，都均等地碰接在平坦的载置面上。因而，能安稳地将自立袋1站立起来。
各侧面板12的板幅，朝侧面板12的上方逐渐减少。在各侧面板12的两侧缘10之上端部，呈平滑的曲线形状。在包装袋2的两侧缘10之上端，通过对两侧面板12的一部分开槽，形成上凹口17。上凹口17包括上凹口面17a和方形面17b。上凹口面17a，沿着与包装袋2的侧缘10呈正交的方向延伸；方形面17b，从上凹口面17a到包装袋2的上缘15，顺着圆弧延伸。也就是说，上凹口面17a配置在包装袋2上缘15的下方。在包装袋2的上缘15中，在两侧面板12的未接合部分，形成开口部16。
作为底面板11以及侧面板12的基材，至少可以列举单面具有热熔接性的塑料膜，或者在塑料膜上层压了铝箔和纸等的层压膜。对于底面板11，既可以使用与侧面板12相同的基材，还可以使用不同的基材。
具体来说，可以列举具有热熔接性的单层塑料膜，包括在外层有热熔接性的树脂层的共挤压多层膜，在具有热熔接性的树脂层上层压了铝箔等金属箔、纸或者各种塑料膜的层压膜。作为树脂层和塑料膜，最好采用具有热熔接性，而且起密封剂层作用的聚乙烯和聚丙烯等聚烯烃树脂。作为增强膜自身强度的树脂，可以列举尼龙等聚酰胺系树脂、聚对苯二甲酸乙二醇酯(polyethyleneterephthalate)等聚酯系树脂以及聚烯烃树脂。从强度和尺寸的稳定性好这一观点出发，作为增强用树脂层，最好采用在一轴或者在二轴上延伸的膜。
作为底面板11以及侧面板12，可以采用单层塑料膜，但最好采用层压了增强用树脂层的膜。尤其是从让内面有密封剂层作用，让外面有接合加强部件3的接合面作用这一观点来看，最好使用在膜的两面都层压了热熔接性树脂层的膜。底面板11，在折叠状态下，在面向侧面板12的一侧，具备有热熔接性的密封剂层，在不面向侧面板12的一侧，具备非热熔接性的延伸膜。
在底面板11及侧面板12上，为了增加隔断氧和水蒸气等气体的机能，根据需要也可以设置气体阻挡层。该气体阻挡层，是通过将乙烯-乙烯醇共聚体(EVOH)层和聚氯亚乙烯系树脂层的共挤出、镀膜和层压，或者蒸镀金属和陶瓷等方法形成的。
底面板11及侧面板12基材的厚度，例如最好有20～900μm厚。从保形性和自立性方面看，最好使用厚基材，但从柔软性，轻量性和节省资源这些方面来看，则以使用薄基材为佳。在本实施例中，因为在自立袋1的两侧部设置了加强部件3，所以即便是薄基材，也能确保其保形性和自立性。不过，从成形性和使用性方面看，基材的厚度，最好控制在100～200μm的范围之内。
在包装袋2中，作为热熔接部30，由底缘热熔接部31，侧缘热熔接部32以及上缘热熔接部33形成。底缘热熔接部31是底面板11和各侧面板12下端部的熔接部分；侧缘热熔接部32是各侧面板12两侧缘的熔接部分；上缘热熔接部33是各侧面板12上缘的熔接部分。底缘热熔接部31的下缘，形成包装袋2(侧面板12)的底缘14。底缘热熔接部31纵向的宽度，设计成为越靠近包装袋2的各侧缘10(各侧缘热熔接部32)越大。底缘热熔接部31的上缘，沿着圆弧延伸。侧缘热熔接部32，形成包装袋2的侧缘10(两侧面板12的侧缘)。侧缘热熔接部32的宽度，设计成为越在面向侧面板12的上方越大。
如图2所示，在包装袋2的两侧缘10上形成加强部件3，以包覆侧缘热熔接部32的外面。加强部件3的下端部3a，凸出到下凹口13的下凹口面13a的下方。加强部件3的下端部3a，位于下凹口13的下凹口面13a和包装袋2的底缘14之间。
加强部件3的上端部3b，凸出到上凹口17的上凹口面17a的上方。加强部件3的上端部3b，位于上凹口17的上凹口面17a和包装袋2的上缘15之间。加强部件3的上端部3b和上缘热熔接部33，在横向上相隔一定间隙S 1配置。同时，加强部件3的上端部3b和上缘热熔接部33，在纵向上相隔一定间隙S2配置。
加强部件3的厚度，从提高包装袋2的保形性和自立性的观点来看，例如一般设定在0.1～5.0mm的范围内。这里，所谓加强部件3的厚度，是指对应于两侧面板12厚度方向上的尺寸。作为形成加强部件3的材料，一般采用构成侧面板12的树脂层(例如密封剂层和外表面的树脂层)和具有熔接性的树脂。在注塑成形时，靠熔融树脂的热，熔化侧面板12的树脂层。于是，侧缘热熔接部32的侧面32a以及表面的至少一方和加强部件3就被熔接和接合在一起。
作为形成加强部件3的材料，可以列举聚乙烯和聚丙烯等聚烯烃树脂，尼龙等聚酰胺系树脂，聚对苯二甲酸乙二醇酯等聚酯系树脂等热塑性树脂。这些热塑性树脂，和底面板11及侧面板12之间，具有热熔接性。例如，如果使用跟侧面板12的密封剂层或外表面的热塑性树脂同类或同一树脂的话，就会在加强部件3和侧面板12之间获得较高的接合强度。
如图3所示，在包装袋2上部中央设置有口具4。口具4具有开口50。在口具4的上部，装有锁闭开口50用的帽盖5。通过在口具4上部配置旋转帽盖，可以把帽盖5安装在口具4上，或者从口具4拆下来。
口具4的表面，在将口具4熔接在包装袋2上的点，最好采用能与侧面板12密封剂层熔接的热塑性树脂。作为形成口具4的材料，可以采用聚乙烯(PE)，聚丙烯(PP)，乙烯-醋酸乙烯共聚体(EVA)，聚对苯二甲酸乙二醇酯(PET)等的聚酯、尼龙等聚酰胺、环状聚烯烃、聚丁烯等热塑性塑料。口具4也可以用跟加强部件3同类或同一树脂制成。
其次，参照图1、图4及图5说明上述自立袋1的制造方法。
首先，做成如图1所示的包装袋2。具体来说，首先，沿折线11a折叠底面板11，朝里面(图1中朝上)折两折。其次，配置一对侧面板12，夹紧折了两折的底面板11，采用接合装置(密封装置)，将各板热熔接并接合在一起。然后将底面板11和各侧面板12的熔接部分(底缘热熔接部31及侧缘热熔接部32)，剪成规定形状，做成包装袋2。下凹口13及上凹口17，也可以在裁剪熔接部分时形成。另外，还可以在热熔接各板之前，预先在底面板11及侧面板12上做好。
其次，将包装袋2装入金属模具内，通过注塑成形，在包装袋2的两侧缘10上，形成加强部件3。具体来说，如图4所示，首先把包装袋2的侧缘10配置在第1金属模具60的第1凹部61内，将包装袋2置于第1金属模具60内。然后，将第2金属模具70接合于第1金属模具60内。此时，在第2金属模具70的第2凹部72和第1金属模具60的第1凹部61之间，形成空腔C。在空腔C纵向的两端，第1金属模具60及第2金属模具70都不与包装袋2的侧缘10相接。并且，将空腔C内抽成真空，从设于第2金属模具70内的填充口71，将熔融树脂注入空腔C内，通过将树脂固化，在包装袋2的两侧缘10形成加强部件3。填充口71是在空腔C的上方形成的，但也可以在空腔C的一侧形成。
最后，如图5(A)、(B)所示，在包装袋2的上部中央安装口具4。具体来说，先将包装袋2置于填充机的托架上。然后打开包装袋2的开口部16，往开口部16插入喷嘴，往包装袋2里填充内容物。接着，采用送料器等，在开口部16上配置口具4，在包装袋2的开口部16热熔接口具4。通常，填充机的密封金属模具和冷却金属模具的碰接面是平坦的。然而，在将口具4热熔接于包装袋2的情况下，如图5(A)所示，也可以使用在碰接面上具有与口具4的基部51形状大致相同的凹部81的第1密封金属模具80。在此情况下，从内容物填充和产品搬送都比较容易等两点看，在安装口具4之前，有利于往自立袋1内填充内容物。
在熔接口具4时，首先，因为只是热熔接口具4的一部分，所以一般采用宽度狭窄的第1密封金属模具80。通过最初实施的第1热熔接，口具4的基部51先与包装袋2的开口部16接合。其次，如图5(B)所示，采用宽度比第1金属模具80更大的第2密封金属模具90。通过其次实施的第2热熔接，熔接两侧面板12的未熔接部分，与此同时，再次对基部51加热加压。在第2密封金属模具90中，与开口部16对应部分的长度，只要是在插入口具4状态下，能密封住开口部16外周全体的尺寸就可以。按照上述方法，在实施完第1热熔接之后，因为在两侧面板12之间有一开口，能从填充了内容物的包装袋2排出空气，所以比较好。另外，在将口具4热熔接之后，为了抑制两侧面板12因热收缩而导致的变形，最好使用冷却金属模具，并尽快冷却两侧面板12。
使用第2密封金属模具90，通过热熔接两侧面板12的上缘，形成上缘热熔接部33，以沿包装袋2的上缘15，密封开口部16(参照图2及图3)。上缘热熔接部33的两端部，与各侧缘热熔接部32的上端部互相重叠。藉此，可确保开口部16两端近旁的密封性。
在如此形成的自立袋1中，如图3所示，底面板11从折了2折的状态扩张，并使包装袋2的下部鼓起。这样，可以制得既保持包装袋2所具有的柔韧性，其自立性又较好的自立袋1。对填充在包装袋2中内容物的种类，并没有特别的限定，不过，最好是诸如液体，粘稠物，粉体，小径粒状物等流动性物质。在包装袋2的上部，设置带盖帽5的口具4。因此，还可能在自立袋1启封之后，短期保存残留的内容物。倒空了的自立袋1，折叠或滚卷起来，都能减小其容积。因此，可制得废弃性良好，环保性适宜的自立袋1。另外，由于在包装袋2的两侧缘10形成了加强部件3，所以能提高其保形性和自立性，防止自立袋1在其中部附近折弯。因此，即使剩余量少，只要倾斜自立袋1，就很容易倒出其中的内容物，另外，因为能确保自立袋1的自立性，所以能防止内容物的撒漏。
按照本实施例能得到以下效果：
(1)在包装袋2的两侧缘形成有加强部件3。另外，加强部件3的下端部3a配置在包装袋2底缘14的上方。在此情况下，因为加强部件3的下端不与载置面碰接，故能依靠整个包带袋2的底缘14，将自立袋1稳定地自立起来。也就是说，能良好地保持使自立袋1自立时的姿势。
(2)在包装袋2侧缘10的下端，设置有下凹口13。另外，加强部件3的下端部3a，位于下凹口13的下凹口面13a和包装袋2的底缘14之间。根据这种结构，在加强部件3注塑成形的时候，包装袋2侧缘10的下端部，不会被第1和第2金属模具60、70夹住。也就是说，由于在加强部件3的下端部3a附近，第1及第2金属模具60、70直接碰接，所以可能避免注入到空腔C内的树脂溢漏。从而，可以在注塑成形时，极力抑制溢料(毛刺)的发生。因此，可避免由于消除溢料(毛刺)所造成的制造效率降低。
(3)在包装袋2两侧缘10的上端，设置了上凹口17。在此情况下，在加强部件3注塑成形的时候，包装袋2的侧缘10的上端部，也不会被第1及第2金属模具60、70夹住。也就是说，在加强部件3上端部3a的附近，由于第1及第2金属模具60、70是直接碰接的，所以可能避免注射到空腔C内的树脂溢漏。因而，在注塑成形时，可能极力抑制溢料(毛刺)的发生。因此，可能避免由于消除溢料(毛刺)所造成的制造效率降低。
(4)当在包装袋2形成加强部件3，包装袋2内填充了内容物之后，在自立袋1上安装口具4。在此情况下，扩大包装袋2的开口部16，可快速将内容物填充到包装袋2里。另外，跟在填充内容物之前，在包装袋2上安装口具4的方法不同，可分别管理包装袋2和口具4，这对保管和搬运是很有利的。
(5)加强部件3的上端部3b，凸出于上凹口的17上凹口面17a的上方，而且，从包装袋2的开口部16开始，空开间隙S1及间隙S2进行配置。借此，加强部件3，不会在往包装袋2里填充内容物时成为障碍。另外即使在填充了内容物之后，也很容易在包装袋2上安装口具4。因而，在形成上缘热熔接部33前后的任何时间段，都很容易往包装袋2里填充内容物。
(6)在包装袋2的上缘15附近，侧缘热熔接部32的内缘，不被加强部件3包覆。借此，密封开口部16的第2密封金属模具90，只要密封包装袋2上缘15的开口部16附近的限定部分就可以了。因此，在密封包装袋2上缘15的开口部16的时候，可避免第2密封金属模具90和加强部件3之间的接触。
另外，本实施例也可以做以下变更。
在本实施例中，作为接合各块板的方法，除了热熔接工艺之外，例如，也可以采用粘结剂接合、超声波粘结，高频粘结等工艺。另外，包装袋2也可以用任意几块板来做成。
在本实施例中，底缘热熔接部31的宽度，虽然设定成越靠近各侧缘热熔接部32越宽，但也可以在各侧缘热熔接部32的附近保持一定。另外，侧缘热熔接部32的宽度，虽然设定成越靠近侧面板12上方越宽，但也可以总是保持不变。
在本实施例中，只要上缘热熔接部33和侧缘热熔接部32的上端部部分互相重叠，侧缘热熔接部32上端的位置，也可以设定在包装袋2上缘15之下方的位置。另外，如果可能往包装袋2熔接口具4，也可以将侧缘热熔接部32上端附近的宽度加宽。
在本实施例中，也可以将加强部件3做成断面呈n字型，并通过将加强部件3夹入侧缘热熔接部32，将加强部件3和包装袋2进行物理接合。另外，还可以通过粘结材料，接合加强部件3和包装袋2。
在本实施例中，也可以采用1次性热熔接，实施往包装袋2上安装口具4和形成上缘热熔接部33。另外，往包装袋2安装口具4的时机，也可以选择在往包装袋2里填充内容物前后的任何一段时间。
在本实施例中，也可以在往包装袋2里填充内容物之后，将侧面板12的上缘15进行热熔接，密封开口部16。另外，还可以在开口50处采用将盖帽5一体化的单片型口具4。
在本实施例中，也可以省略包装袋2侧缘10的凹口。在此情况下，例如，可以如图6所示，将加强部件3的上端部3b，配置在包装袋2上缘15的上方，跟上缘热熔接部33，在横向上空开间隙S1配置。在此情况下，在将口具4往包装袋2安装的时候，接合(密封)整个开口部16的第2密封金属模具90的长度，设定为大于或等于达到两侧侧缘热熔接部32的长度。
在第2密封金属模具90的长度，比两加强部件3之间的间隔更短的情况下，最好将自立袋1应用到容量在大于或等于1升的大型袋中。在此情况下，由于第2密封金属模具90的两端和两加强部件3之间的间隙能充分确保，所以在第2密封金属模具90上的自立袋1的定位精度要求得以放宽，使得依靠填充机进行口具4的连续安装作业得以稳定。在对尺寸各异的袋子进行多品种制造的情况下，由于不让第2密封金属模具90的两端设置在包装袋2的外方，所以只要根据两加强部件3之间的间隔距离，把第2密封金属模具90，更换成具有适当长度的金属模具就行。另一方面，如果使用小型的第2密封金属模具90，则可应用到容量不到1升的小型袋中。
在本实施例中，下凹口13的形状，例如也可以变更成如图7及8所示的形状。下凹口13的形状，既可以是如图7所示的圆弧形，也可以是如图8所示的锥形。也就是说，加强部件3的下端部3a，可以设置在包装袋2侧缘10下端部的下方，对下凹口13的形状没有特别限定。同样，对于上凹口17的形状，既可以是圆弧形，也可以是锥形。
在本实施例中，下凹口13的位置，也可以变更成在包装袋2侧缘10最下端的上方。同样，上凹口17的位置，也可以变更成在包装袋2侧缘10最上端的下方。例如，如图9所示，加强部件3的上端部3b和上缘热熔接部33，在纵向上空开间隙S2配置。
在本实施例中，加强部件3是做成一体的，但也可以用多根加强部件3做成。在此情况下，也可以根据加强部件3的数量，变更上凹口17及下凹口13的数量。另外，加强部件3的上端部3b是平滑弯曲的，但是也可以根据侧面板12的形状，例如，采用直线状的加强部件3。
在本实施例中，下凹口13、上凹口17分别具有圆弧状的方形面13b和方形面17b，不过，方形面13b和方形面17b的形状也可以变更为直角。
在本实施例中，也可以适当变更口具4相对于包装袋2的安装位置。例如，如图10所示，也可以在包装袋2的角部形成倾斜缘18，在这个倾斜缘18上安装口具4。
在本实施例中，也可以不让加强部件3的下端部3a，凸出到下凹口13的下凹口面13a的下方。也可以不让加强部件3的上端部3b，凸出到上凹口17的上凹口面17a的上方。
在本实施例中，也可以将加强部件3下端部3a的位置，变更成与包装袋2底缘14相同的位置。另外，还可以将加强部件3上端部3b的位置，变更成与包装袋2的上缘15相同的位置。

Claims (7)

1.一种自立袋，其特征在于，它包括：
收存内容物的包装袋，上述包装袋由多片板的边缘相接合形成袋状，并在上述包装袋的边缘上形成有接合部；和
设置在上述包装袋上部的流通口；和
包覆上述包装袋侧缘外面的加强部件；
上述加强部件由热塑性树脂构成，上述加强部件的下端，位于与上述包装袋的底缘相同的位置，或者位于底缘的上方，上述加强部件包覆在上述包装袋侧缘的上述接合部的外面，并且上述接合部的内侧未被上述加强部包覆而形成外露，上述加强部件通过注塑成型形成并且断面呈U字型。
2.一种如权利要求1所述的自立袋，其特征在于，在上述包装袋侧缘的下端部设有下凹口，上述下凹口具有沿着与上述包装袋侧缘呈正交方向延伸的下凹口面；上述加强部件的下端凸出到上述下凹口的下凹口面的下方。
3.一种如权利要求1所述的自立袋，其特征在于，上述加强部件与上述包装袋的上缘隔开一定距离。
4.一种如权利要求1所述的自立袋，其特征在于，上述加强部件包覆上述包装袋侧缘的一部分。
5.一种如权利要求1所述的自立袋，其特征在于，上述加强部件的上端，位于上述包装袋上缘的下方。
6.一种如权利要求1所述的自立袋，其特征在于，
在上述包装袋侧缘的下端部设有下凹口；
在上述包装袋侧缘的上端部设有上凹口；
上述加强部件，沿上述包装袋侧缘的上述接合部延伸的同时，并形成于上述下凹口与上述上凹口之间。
7.一种自立袋的制造方法，该自立袋包括收存内容物的包装袋，上述包装袋由多片板的边缘相接合形成袋状，并在上述包装袋的边缘上形成有接合部，和设置在上述包装袋上部的流通口以及包覆上述包装袋侧缘外面的加强部件，上述加强部件由热塑性树脂构成，在上述包装袋侧缘的下端部设有下凹口，上述加强部件的下端凸出到上述下凹口的内侧，上述加强部件包覆在上述包装袋侧缘的上述接合部的外面，并且上述接合部的内侧未被上述加强部包覆而形成外露，其特征在于，该方法包括：
形成上述包装袋的工序；和
将上述包装袋的侧缘，配置在第1金属模具的第1凹部，在该第1金属模具内，安装该包装袋的工序；和
在上述第1金属模具内安装好上述包装袋后，在由上述第1金属模具的第1凹部和第2金属模具的第2凹部构成的空腔内，不让上述第1金属模具和第2金属模具接触上述包装袋侧缘的下端，而使两金属模具互相碰接的工序；和
将热塑性树脂注射到上述空腔内，通过注塑成型形成断面呈U字型的上述加强部件，以包覆上述包装袋侧缘的工序；以及
把上述流通口安装在上述包装袋上部的工序。
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