CN115503213A - 用于制造容器的方法 - Google Patents

用于制造容器的方法 Download PDF

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CN115503213A
CN115503213A CN202210717983.5A CN202210717983A CN115503213A CN 115503213 A CN115503213 A CN 115503213A CN 202210717983 A CN202210717983 A CN 202210717983A CN 115503213 A CN115503213 A CN 115503213A
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R·克内尔
S·克内尔
K·伊尔金茨
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C49/22—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
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    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
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    • 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
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    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • B29C49/04116—Extrusion blow-moulding characterised by the die
    • 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
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    • B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
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    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
    • B65D1/0215—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features multilayered
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    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
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    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/0055—Containers or packages provided with a flexible bag or a deformable membrane or diaphragm for expelling the contents
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0009—Cutting out
    • B29C2793/0018—Cutting out for making a hole
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0045—Perforating
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0054—Shaping techniques involving a cutting or machining operation partially cutting through the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3086—Interaction between two or more components, e.g. type of or lack of bonding
    • B29C2949/3094—Interaction between two or more components, e.g. type of or lack of bonding preform having at least partially loose components, e.g. at least partially loose layers
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C49/42—Component parts, details or accessories; Auxiliary operations
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    • B29C49/50—Moulds having cutting or deflashing means
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
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Abstract

一种用于制造容器的方法，该容器由外容器和内袋组成，容器具有容器开口和外容器中的孔，其中在容器的底部区域中挤压出多余材料并且形成接片，内袋的焊接的底部接缝被夹入并且沿轴向方向被保持在接片中，并且通过压力介质使型坯被吹气以贴靠在吹塑模具的器壁处并从吹塑模具中取出，然后在外容器的壁中形成孔，将内袋从外容器的壁分离并且再次贴靠在该处，在外容器的壁中在相对对置的部位处分别形成孔，并且销形的工具通过该孔将内袋从外容器的壁推回预定的距离并且在此与该壁分离，然后压力介质、优选地压缩空气通过该孔被引入内袋和外容器之间的中间空间中，其基本上将整个内袋与外容器的壁分离。

Description

用于制造容器的方法
技术领域
本发明涉及一种用于制造优选地为瓶形的容器的方法，该容器由基本上刚性的外容器和可容易变形的内袋构成，该外容器和内袋由彼此不形成焊接连接的热塑性塑料制成，其中容器具有容器开口和在外容器中的至少两个壁开口，当排出容器内容物时，通过壁开口实现在内袋和外容器之间的中间空间中的压力平衡，其中在该方法中，由至少两个软管组成的型坯被共挤出并布置在吹塑模具的打开的半模之间，并且当型坯具有用于制造容器所需的长度时，吹塑模具被关闭，其中在待制造的容器的底部区域中挤压出多余材料并且由外容器的焊接材料形成接片，内袋的焊接的底部接缝被夹入并且沿轴向方向被保持在该接片中，并且其中型坯通过压力介质被吹气以贴靠在吹塑模具的器壁处并从吹塑模具中取出，然后形成壁开口并且将内袋与外容器的壁分离并且再次贴靠在该处。
背景技术
这种方法早已为人所知。DE 4139555 C2公开了一种如此制造的容器，在该容器中通过下述方式形成壁开口，即在关闭吹塑模具时在瓶形容器的肩部区域中挤压出型坯的径向突出的材料，由此在肩部处产生未焊接的、开放式开口。
EP 0 912 420 B1提出，在外容器中形成与由底部接缝和容器的纵向轴线限定的平面错开90°的壁开口，使得在排出容器内容物时内袋可以折叠成扁平的。由此，可以以减少的残余量排放出容器内容物，其中在内袋中产生的负压也更小。
为了借助无气泵或通过在挤压瓶处施加外部压力使容器内容物尽可能完全地带出，已证明，在装填容器之前将内袋与外容器的壁分离，内袋以相当大的附着力贴靠在该外容器处。在此已经表明，尤其在容器的肩部的区域中只能以不一致的或不完全的方式进行分离，因此容器内容物的少量残余无法排放出。然而，当在分离过程中，内袋尤其在到肩部区域的过渡的区域中不规则地变形和部分地折叠时，还会出现更严重的问题，这在某些情况下可能导致袋材料的白裂纹(Weiβbruch)，从而可能导致通过受损的部位损坏内袋的扩散保护层或者甚至可能导致袋不密封。
申请人已经发现，当型坯被吹气以贴靠在吹塑模具的器壁处时，内袋在周向方向上具有不同的壁厚，更确切地使得内袋在延伸通过底部接缝的竖直平面的区域中比在位于其间的壁区域中更厚。对此的解释可以在于，当底部接缝被挤压出时，型坯从圆柱形的初始形状被扁平地压紧在一起，其中后续的吹气产生较大的圆柱形形状，在底部接缝的端部上方的区域中具有上面提到的较大的壁厚。
在通过将气压引入外容器的相对于加厚的区域错开90°的开口中来分离内袋时，在被吹气的容器的所提及的外周区域中的该较大的壁厚可能导致，内袋在分离时不规则地变形，其中尤其在到容器的肩部区段的过渡区域中可能构造有类似褶皱的翘曲，其本身(ihrerseits)可能导致内袋的白裂纹，通过该白裂纹可能损坏内袋的蒸汽扩散层或甚至可能内袋不密封。以这种方式被损坏的容器连同容器内容物一起不可被使用。
发明内容
本发明的目的在于，给出一种方法，用该方法可以制造可用的容器，在该容器中避免上述损坏。
该目的根据本发明通过技术方案1所述的特征得以实现。
在其他技术方案中描述本发明有利的设计。
本发明规定，在制成的被吹气的容器中在外容器的壁中在相对对置的部位处分别形成孔，该相对对置的部位位于通过底部接缝和容器的纵向轴线限定的平面与容器壁的相交线上，并且销形的工具通过孔将内袋从外容器的壁推回预定的距离并且由此与壁分离，然后压力介质、优选压缩空气通过孔被引入在内袋和外容器之间的中间空间中，其基本上将整个内袋与外容器的壁分离。
在此，当销形工具形成为空心时，可以通过销形工具、或者例如通过容器布置在其中的压力容器将压力介质吹入。
孔可以在所提及的外周区域中形成在容器的任意高度处。然而特别有利地提出，当容器具有瓶形时，将孔构造在容器的肩部区域中，其中孔也可以在肩部区域下方或上方邻近地形成。
非常有利地还规定了，通过环形刀切割形成孔，这正如DE 197 37 964 C1所描述的那样。但例如将旋转的管状刀(Rohrmesser)用于在外容器中产生通孔也在本发明的范围内。
用根据本发明的方法可以使内袋在其整个周向上顺利地与外容器的壁分离，由此避免内袋的损坏或甚至其的不密封。由于内袋可以一致地且完全地与外容器的壁分离，还可以在排出容器内容物时避免无法带出内容物的大量的残渣，正如在未完全分离过程中的情况那样。
附图说明
本发明的其他特征由用根据本发明的方法制造的瓶形的容器的以下说明得出。在此示出了：
图1A至1D示出了容器的不同视图和竖直剖面；
图2示出了容器，其具有用于将内袋与外容器的壁分离的冲压销。
具体实施方式
图中所示的容器1包括颈部区域2，该颈部区域经由肩部区域3过渡到较宽的区域4中。容器1由基本上刚性的外容器5和可容易变形的内袋6构成。
直线的挤压接缝7位于容器的底部处，内袋6被保持在该挤压接缝中。
图1B示出了穿过外容器5的壁的孔8的侧视图，该孔位于穿过焊接的底部接缝7和容器1的中央纵向轴线的竖直平面中。图1C和图1D示出，两个孔8以相对对置的方式形成在外容器6的壁中。也就是说，两个孔8并非如现有技术中的情况那样沿周向方向相对于该平面错开。
两个孔8位于容器1的宽部4到其肩部区域3的过渡区域中。
附图还示出，孔8不是通过钻孔工具而是通过环形刀切割形成的，如优选的那样。
图2示出了具有冲压销10的装置9，该冲压销穿过孔8将内袋6以一定距离压紧到容器1的内部，以便将内袋6在周围区域中与外容器5的壁分离，然后由装置9或者由另外的装置通过吹入压缩空气继续分离过程。图2的右侧部分示出了具有缩回的冲压销10的装置9。

Claims (5)

1.一种用于制造容器的方法，所述容器由基本上刚性的外容器和能容易变形的内袋构成，所述外容器和所述内袋由彼此不形成焊接连接的热塑性塑料制成，所述容器具有容器开口和在所述外容器中的孔，通过所述孔实现在所述内袋和所述外容器之间的中间空间中的压力平衡，其中由至少两个软管构成的型坯被共挤出并布置在吹塑模具的打开的半模之间，并且当所述型坯具有用于制造所述容器所需的长度时，所述吹塑模具被关闭，其中在待制造的所述容器的底部区域中挤压出多余材料并且由所述外容器的焊接材料形成接片，所述内袋的焊接的底部接缝被夹入并且沿轴向方向被保持在所述接片中，并且所述型坯通过压力介质被吹气以贴靠在所述吹塑模具的器壁处并从所述吹塑模具中取出，
然后在所述外容器的壁中形成孔，将所述内袋与所述外容器的所述壁分离并且再次贴靠在该处，
其特征在于，
在所述外容器的所述壁中在相对对置的部位处分别形成孔，所述相对对置的部位位于通过所述底部接缝和所述容器的纵向轴线限定的平面与容器壁的相交线上，并且
销形的工具通过所述孔将所述内袋从所述外容器的所述壁推回预定的距离并且由此与所述壁分离，然后压力介质、优选压缩空气通过所述孔被引入在所述内袋和所述外容器之间的所述中间空间中，其将所述内袋与所述外容器的所述壁分离。
2.根据权利要求1所述的方法，其特征在于，所述容器具有带有肩部区域的瓶形，将所述孔形成在所述肩部区域中或在所述肩部区域下方邻近地形成。
3.根据权利要求1或2所述的方法，其特征在于，通过环形刀切割形成所述孔。
4.根据权利要求1或2所述的方法，其特征在于，通过旋转的管状刀形成所述孔。
5.根据权利要求1至4中任一项所述的方法，其特征在于，通过所述销形的工具引入所述压缩空气。
CN202210717983.5A 2021-06-23 2022-06-23 用于制造容器的方法 Pending CN115503213A (zh)

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US5301838A (en) 1991-01-23 1994-04-12 Continental Pet Technologies, Inc. Multilayer bottle with separable inner layer and method for forming same
DE4139555A1 (de) * 1991-09-18 1993-03-25 Gaplast Gmbh Behaelter
DE19626968A1 (de) * 1996-07-04 1998-01-15 Gaplast Gmbh Behälter mit Druckausgleichsöffnung
DE19737964C1 (de) * 1997-08-30 1998-10-08 Gaplast Gmbh Verfahren zur Herstellung eines Behälters sowie Behälter mit Druckausgleichsöffnungen
DE102006012487B4 (de) * 2006-03-16 2008-08-21 Gaplast Gmbh Verfahren und Vorrichtung zur Herstellung eines Behälters
JP5979467B2 (ja) * 2011-08-31 2016-08-24 株式会社吉野工業所 積層ブロー成形容器及び吸気孔の形成方法

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