CN107405818B - 带内表面螺旋条的容器、带内表面螺旋条的容器的制造方法及其制造装置 - Google Patents

带内表面螺旋条的容器、带内表面螺旋条的容器的制造方法及其制造装置 Download PDF

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CN107405818B
CN107405818B CN201580077688.6A CN201580077688A CN107405818B CN 107405818 B CN107405818 B CN 107405818B CN 201580077688 A CN201580077688 A CN 201580077688A CN 107405818 B CN107405818 B CN 107405818B
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parison
container
forming
spiral
strip
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CN107405818A (zh
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德洋一
宇野胜
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Giver Life Co ltd
Daisho Glass Co ltd
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Giver Life Co ltd
Daisho Glass Co ltd
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04Extrusion blow-moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
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    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
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    • B29B11/06Making preforms by moulding the material
    • B29B11/10Extrusion moulding
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    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00Making preforms
    • B29B11/14Making preforms characterised by structure or composition
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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Abstract

带内表面螺旋条的容器的制造方法包括:型坯形成工序,形成在内表面具有突条的筒状的型坯;螺旋条形成工序,从所述型坯形成工序后的型坯的突条形成为螺旋条;以及容器形成工序,使所述螺旋条形成工序后的型坯从内侧膨胀而形成容器,所述螺旋条形成工序包括:夹持工序,对在所述型坯形成工序时被从形成所述型坯的模具挤出而垂下的所述型坯的外表面进行夹持;以及旋转工序,保持在所述夹持工序中夹持所述型坯的状态而使所述型坯绕着所述型坯的轴旋转。

Description

带内表面螺旋条的容器、带内表面螺旋条的容器的制造方法 及其制造装置
技术领域
本发明涉及一种带内表面螺旋条的容器、带内表面螺旋条的容器的制造方法及其制造装置。
背景技术
以往的直接吹塑成型装置具有:型坯形成模具(以下,简称为模具。),将熔融状态的热塑性树脂挤压成管状而形成型坯;芯部,配置在型坯形成模具的热塑性树脂的排出开口部的中心部;以及容器模,在将形成的型坯的一端部密封的状态下使型坯膨胀成容器形状(例如,参照专利文献1)。
另外,在专利文献1中,为了在容器的内表面形成突条(肋)而提出了在芯部形成槽的方案。该槽沿芯部的轴向延伸。通过该槽在从模具挤出的型坯的内表面形成沿着轴向的直线状的突条。并且,将该型坯放入上述的容器模,使型坯膨胀成容器的形状。由此,形成在内表面具有直线状的突条的容器。
现有技术文献
专利文献
专利文献1:日本特公平1-18846号公报
发明内容
发明要解决的课题
然而,在以往的直接吹塑成型装置中,虽然能够在容器的内表面形成沿着轴向的直线状的突条,但在容器的内表面无法形成螺旋状的突条(以下,称为螺旋条)。虽然也考虑了通过使以往的芯部的槽相对于轴向倾斜来形成螺旋条的情况,但是,在这种情况下,被从模具挤出而垂下的型坯的长度越长,则由于型坯的自重而使螺旋条也越是与型坯一起向轴向延伸,使得螺旋条的形状发生变形,因此存在无法在容器的内表面上形成所期望的螺旋条这样的问题。
本发明鉴于上述的点而完成,其目的在于提供一种能够形成所期望的螺旋条的带内表面螺旋条的容器的制造方法及其制造装置。
用于解决课题的技术方案
本发明1涉及一种带内表面螺旋条的容器的制造方法,包括如下的工序:型坯形成工序,形成在内表面具有突条的管状的型坯;螺旋条形成工序,将所述型坯形成工序后的型坯的突条形成为螺旋条;以及容器形成工序,使所述螺旋条形成工序后的型坯从内侧膨胀而形成容器,所述螺旋条形成工序包括:夹持工序,对在所述型坯形成工序时被从形成所述型坯的模具挤出而垂下的所述型坯进行夹持;以及扭转工序,保持在所述夹持工序中夹持所述型坯的状态而使所述型坯与所述突条一起向周向扭转。
在本发明1中,优选的是,包括对所述型坯的内表面的突条进行冷却的冷却工序,所述冷却工序与所述型坯形成工序及所述螺旋条形成工序一起进行。
另外,本发明2涉及一种带内表面螺旋条的容器的制造装置,具有:型坯形成设备,形成在内表面具有突条的管状的型坯;螺旋条形成设备,将所述型坯的突条形成为螺旋状;以及容器形成设备,使所述突条成为螺旋状的型坯从内侧膨胀而形成容器,所述螺旋条形成设备具备:夹持部,对被从所述型坯形成设备所具有的模具挤出而垂下的所述型坯进行夹持;以及旋转部,为了使所述型坯与所述突条一起向周向扭转,使所述夹持部与所述型坯一起向所述型坯的周向旋转。
本发明3涉及一种带内表面螺旋条的容器,包括:螺旋条,形成于容器内表面;以及口部,形成于容器顶部,所述螺旋条通过伴随着型坯的内表面的冷却,使从形成所述型坯的模具挤出而垂下的所述型坯与突条一起扭转而形成,所述型坯是在内表面具有所述突条的管状的型坯,所述口部的开口端面是仅通过切断加工而形成的平坦面,所述切断加工将被从所述模具挤出而垂下的形成有所述螺旋条的所述型坯从所述模具切断。
发明效果
根据本发明1及本发明2,对从形成型坯的模具垂下的管状的型坯进行夹持,在夹持型坯的状态下使型坯绕着型坯的轴旋转。通过该旋转而使型坯向周向扭转。通过该扭转加工,型坯的内表面的突条被扭转而成为螺旋条。并且,通过使形成有该螺旋条的型坯从内侧膨胀而能够制作带内表面螺旋条的容器。
根据本发明1及本发明2,在被从模具挤出而垂下的状态的型坯还未形成螺旋条,因此即使因型坯的自重而使型坯向轴向延伸,也不会产生螺旋条的形状变形的问题。而且,将从模具垂下的状态的型坯的下侧部分抓持而扭转,因此能够在型坯的轴向整体形成漂亮的螺旋条。
另外,根据本发明3,在带内表面螺旋条的容器中,不需要进行用于使口部的开口端面平坦的切削加工等,也不会出现因切削加工等而产生的毛刺进入容器2中的情况。
附图说明
图1是带内表面螺旋槽的容器的纵剖视图。
图2示出本发明的一个实施方式的带内表面螺旋条的容器的制造装置的概略图,(a)是型坯形成设备,(b)是螺旋条形成设备,(c)是容器形成设备。
图3是型坯形成设备的主要部分的剖视图。
图4是图3的IV-IV剖面的剖视图。
图5是图3所示的凹槽形成构件的单一部件状态下的俯视图。
图6是螺旋条形成设备的概略图。
图7是表示螺旋条形成设备的螺旋条形成部的图,(a)是主视图,(b)是侧视图。
图8是示出型坯形成工序和螺旋条形成工序的带内表面螺旋条的容器的制造装置的概略图。
图9是示出容器形成工序的带内表面螺旋条的容器的制造装置的概略图。
具体实施方式
以下,参照附图,详细说明本发明的实施方式。
(带内表面螺旋条的容器)
图1是带内表面螺旋条的容器2(以下,简称为容器2。)的纵剖视图。容器2形成为有底的筒形状。在容器2的顶部形成有口部202,在口部202的外周面形成有外螺纹。
容器2具有其轴向中间部比轴向两端部更向与轴向垂直的方向鼓起的形状。容器2的外周面及内周面206中,仅在内周面206形成有多个螺旋条(螺旋状的突条)207。多个螺旋条207沿容器2的周向大致等间隔地配置。
容器2适合作为用于容纳化妆品、医药品等的容器。例如,在容器2的外周面未形成突条,因此在该外周面容易粘贴标签。而且,在容器2为透明或半透明的情况下,能够从外部观察到容器2的内周面206的螺旋条207,因此能够提高容器2的美观度,能够使包含该容器2的商品显眼。而且,通过螺旋条207能够对容器2进行加强。
另外,容器2的口部202的开口端面205是沿着与轴向垂直的方向的平坦面。该平坦面是仅通过将用于形成容器2的型坯4从模具切断时的切断加工而形成的面。因此,与以往不同,不需要进行用于使口部202的开口端面205平坦的切削加工等,也不会出现因切削加工等而产生的毛刺进入容器2中的情况。关于上述的切断加工,详情在后文中叙述。
<带内表面螺旋条的容器的制造装置>
接下来,说明该带内表面螺旋条的容器的制造装置。该制造装置能够通过直接吹塑成型而简便地制造带内表面螺旋条的容器。图2是本发明的一个实施方式的带内表面螺旋条的容器的制造装置(以下,称为直接吹塑成型装置。)的概略图。
如图2(a)~(c)所示,直接吹塑成型装置具备:型坯形成设备5,形成管状的型坯4;螺旋条形成设备100,将型坯4扭转;以及容器形成设备6,使型坯4膨胀成容器形状而得到容器2。在直接吹塑成型装置中,螺旋条形成设备100和容器形成设备6构成为相对于型坯形成设备5移动自如。
(型坯形成设备的概要)
在型坯形成设备5中,对具有热塑性的树脂3进行加热,将由于加热而成为熔融状态的树脂3挤压成管状,由此形成型坯4。在此,作为具有热塑性的树脂3,可以例示PET(polyethylene terephthalate:聚对苯二甲酸乙二醇酯)树脂等。
如图2(a)所示,型坯形成设备5具有:型坯形成模具8,用于将熔融状态的热塑性树脂挤压成管状而形成型坯4;以及树脂材料供给部9,将熔融的树脂向型坯形成模具8供给。
树脂材料供给部9具有:呈漏斗状的树脂材料投入口12;呈圆筒状的加热筒13,设置在树脂材料投入口12的下部,用于对树脂材料进行加热;挤压螺杆14,用于对加热筒13的内部的树脂材料进行挤压;以及电动机15,对挤压螺杆14进行驱动。
挤压螺杆14与加热筒13同轴地设置在加热筒13的内部,且形成为圆柱状,在外周具有螺旋状的齿。挤压螺杆14由电动机15驱动而旋转。由此,处于加热筒13内的树脂被型坯形成模具8挤压。
型坯形成模具8包括:心轴18,作为将熔融状态的热塑性树脂挤压成管状时的轴模;以及型坯形成模具主体20,在心轴18的周围设置环状通路19而围绕心轴18。在型坯形成模具主体20的孔的内周与心轴18的外周之间区划出环状通路19。以环状通路19朝向下方敞开的方式使心轴18的轴向A1沿着上下方向。熔融状态的树脂3由于通过环状通路19而形成为管状,在环状通路19的出口侧端部成为型坯4。
另外,型坯形成设备5具有形成于心轴18的后述的第一通风路径22以及向第一通风路径22供给加压冷却气体的第一气体供给源23。
第一气体供给源23将作为气体流的加压冷却气体向心轴18的第一通风路径22供给。第一通风路径22通向型坯4的内侧。加压冷却气体例如是预定压力的常温的空气。
由此,加压冷却气体通过第一通风路径22而吹入型坯4内。其结果是,能够将通过型坯形成模具8而形成的型坯4保持为管状。
(在容器内表面形成突条的结构的详情)
图3是型坯形成设备5的主要部分的剖视图。图4是图3的IV-IV剖面的剖视图。参照图3和图4,在心轴18的外周35形成有为了在型坯4的内周406成型出突条407而沿心轴18的轴向A1延伸的凹槽36。而且,心轴18的第一通风路径22具有通过心轴18的外周35的凹槽36向型坯4内吹入加压冷却气体的功能。
心轴18具有:作为心轴主体的筒状的主体部37;以及凹槽形成构件38,固定于主体部37的端部,并形成环状通路19的出口侧端部及凹槽36。心轴18的外周35包括由主体部37的外周形成的部分及由凹槽形成构件38的外周形成的部分。
在一个实施方式中,主体部37与凹槽形成构件38形成为彼此单独形成的部件。主体部37与凹槽形成构件38通过作为固定构件的螺栓39而彼此固定。另外,主体部37与凹槽形成构件38的固定方法未限定为基于螺栓39的固定方法。例如,主体部37与凹槽形成构件38也可以通过单一材料而一体形成。在本实施方式中,按照主体部37与凹槽形成构件38由螺栓39固定的情况进行说明。
主体部37是沿心轴18的轴向A1延伸的柱状构件。主体部37的外周面形成环状通路19的一部分,并且与凹槽形成构件38的凹槽36的底部连续地连接,更优选平滑地连接。主体部37具有贯通主体部37的孔40。孔40沿心轴18的轴向A1延伸。在孔40的下侧的端部形成有内螺纹。螺栓39的外螺纹螺纹嵌合于该内螺纹。
凹槽形成构件38具有与主体部37的端面紧贴的第一端面、在心轴18的轴向上处于与第一端面相反的一侧的第二端面及齿轮状的外周。而且,凹槽形成构件38具有供螺栓39插通的插通孔。在螺栓39的头部与主体部37的端面之间以紧固状态夹持有凹槽形成构件38。在凹槽形成构件38的外周形成有多个例如8个凹槽36。另外,凹槽36存在至少一个即可。
多个凹槽36在心轴18的周向上彼此均等地分隔配置。多个凹槽36形成为彼此相等的形状。各凹槽36朝向环状通路19中的树脂3的流动方向的两侧敞开。凹槽36区划出环状通路19的出口的一部分。
环状通路19被区划在型坯形成模具主体20的孔的内周与心轴18的外周35之间。环状通路19的宽度(心轴18的径向上的尺寸)在凹槽36处较宽,在相邻的凹槽36彼此之间较窄。
第一通风路径22具有吹出加压冷却气体的多个吹出口50。吹出口50面向型坯4的突条407地配置于各凹槽36的底部。能够通过加压冷却气体对该突条407进行冷却。吹出口50配置在心轴18的外周35的凹槽36的底部的端部,更具体而言,配置在树脂3被挤压时的环状通路19中的树脂3的移动方向X1上的最上游侧的端部,且与型坯4的突条407的最上游端相对。
另外,第一通风路径22具有:第一部分风路51,形成于心轴18且沿心轴18的轴向A1延伸;以及多个第二部分风路52,形成于心轴18且沿心轴18的径向呈放射状地延伸。在各第二部分风路52中的心轴18的径向外侧的端部(相当于通气的下游侧的端部)形成有吹出口50。
另外,第一通风路径22为了将多个第二部分风路52及第一部分风路51彼此连接而具有形成于心轴18的第三部分风路53。另外,也可考虑将第一部分风路51与第二部分风路52直接连接的情况。
第一部分风路51具有:第一部分55,由心轴18的主体部37的孔40区划出;以及第二部分56,区划在心轴18的孔40的端部的内周面与螺栓39的轴部的外周之间。在螺栓39的轴部的外周形成有沿螺栓39的轴向延伸的多个槽。通过上述的多个槽和心轴18的孔的端部的内周面来区划出第一部分风路51的第二部分56。
第三部分风路53由在心轴18的周向上呈环状地延伸的环状风路构成。第三部分风路53与第一部分风路51的第二部分56的下侧端部连通,且与多个第二部分风路52的心轴18的径向内侧的端部连通。第三部分风路53由例如在螺栓39的轴部的外周形成的周向槽、主体部37的倒角部和凹槽形成构件38的倒角部中的至少一个(在本实施方式中为全部)来区划出。
图5是图3所示的凹槽形成构件38的单一部件状态下的俯视图。参照图3及图5,多个第二部分风路52由在凹槽形成构件38的第一端面形成的放射状的多个槽和主体部37的端面来区划出。
根据本实施方式的型坯形成设备5,通过具有带凹槽36的心轴18的型坯形成模具8的环状通路19而将熔融状态的热塑性树脂挤出,由此能够形成在内周具有突条407的管状的型坯4。在该型坯4形成时,能够使气体流从心轴18的通风路径通过凹槽36吹入到型坯4内。
因此,能够使气体流通过凹槽36而重点上沿着型坯4的内周的突条407流动,因此能够集中地对型坯4的突条407进行冷却,能够将型坯4的突条407的形状维持得不会变形。例如,在使以上述方式形成的型坯4膨胀而形成为容器形状时,能够抑制突条407的形状变形,其结果是,能够在容器2的内周形成形状精度良好的突条407。
另外,通过上述气体流,在通过凹槽36内的突条407的表面与凹槽36的内表面之间形成有较薄的气体层,因此热塑性树脂在凹槽36内容易流动。
(螺旋条形成设备)
螺旋条形成设备100使型坯4的内表面的突条407向螺旋形状进行塑性变形。如图6所示,螺旋条形成设备100具备:基座101;螺旋条形成部102,设置于基座101;移动机构103,使螺旋条形成部102与基座101一起向水平方向及垂直方向移动;传感器108;以及控制部104,对螺旋条形成部102及移动机构103的动作进行控制。
移动机构103使螺旋条形成部102与基座101一起向型坯形成模具8的下侧移动,或者使螺旋条形成部102从型坯形成模具8的下侧退避。
如图6所示,移动机构103具备支承台110、4根支柱111和移动用电动机112。支承台110被支承为相对于沿上下方向延伸的4根支柱111在上下方向上移动自如。当使移动用电动机112进行驱动时,支承台110沿4根支柱111在上下方向上移动。基座101以在与支柱111的长度方向正交的方向上移动自如的方式支承在支承台110的上表面。构成为,通过驱动未图示的电动机,基座101在支承台110的上表面上向左右方向移动。
螺旋条形成部102靠近基座101的端部设置。在一个实施方式中,螺旋条形成部102设置有三个,但是其数量是例示。如图7所示,螺旋条形成部102具备作为夹持部的一对臂部105、开闭机构106和作为旋转部的旋转电动机107。
一对臂部105用于抓持型坯4。臂部的材质为铝,臂部105的外表面由特氟隆(注册商标)包覆。
如图7(a)所示,各臂部105的下端部与开闭机构106连接。当使开闭机构106进行驱动时,一对臂部105的上端部分离或接近,由此进行一对臂部105的开闭动作。各臂部105具有其上端部向内侧弯曲的形状。而且,如图7(b)所示,臂部105具有宽度较宽的形状。通过形成为这样的形状,臂部105容易抓持型坯4。
旋转电动机107设置在螺旋条形成设备100的基座101的上表面。旋转电动机107以旋转电动机107的驱动轴向上方延伸的方式设置。将一对臂部105连接的开闭机构106与旋转电动机107的驱动轴连结。
一对臂部105以各臂部相对于穿过旋转电动机107的驱动轴的轴心的假想线(图7(a)的C)呈线对称的方式配置。该假想线与一对臂部105的对称线一致。
传感器108配置在一对臂部105的侧方且上方(参照图7(a)(b)的虚线所示的传感器108)。
螺旋条形成设备100的控制部104使移动机构103进行驱动而使螺旋条形成部102向型坯形成模具8的下侧移动。此时,使螺旋条形成部102移动,以使型坯4的轴与一对臂部105的对称轴(臂部间的中央线)一致。当传感器108检测到从型坯形成模具8垂下到预定位置的型坯4时,控制部104使螺旋条形成部102的开闭机构106进行驱动,将一对臂部105关闭,使一对臂部105抓持型坯4的外周面的下侧部分。此时,型坯4的外周面的下侧部分成为被臂部105的力压扁的状态。这样,通过将型坯4的外周面的下侧部分压扁,能够使一对臂部105牢固地抓持型坯4。
控制部104在使一对臂部105抓持型坯4的下侧部分的状态下,使旋转电动机107以预定的旋转速度驱动预定的旋转角度。通过该旋转电动机107的驱动,一对臂部105绕着旋转电动机107的旋转轴旋转,型坯4向周向扭转。由此,型坯4的内表面的突条407成为螺旋状。其后,控制部104使移动机构103进行驱动而使螺旋条形成部102从型坯形成模具8的下侧退避。
(容器形成设备)
容器形成设备6具有:基座60;两个容器模25,设置于基座60;打入装置27,具有与形成的容器2的口部的直径对应的吹气针26;以及移动机构(未图示),使容器模25及打入装置27与基座60一起移动(参照图2)。容器模25是用于使被螺旋条形成设备100扭转的型坯4膨胀而形成为容器形状的构件。两个容器模25能够交替地更换。
容器形成设备6的移动机构使容器模25向型坯形成模具8的下侧移动,来代替从型坯形成模具8的下侧退避的螺旋条形成部102。
被螺旋条形成设备100扭转且突条407成为螺旋状的型坯4的一部分容纳在容器模25内,使容纳在容器模25内的型坯4膨胀成容器形状并冷却,由此,得到容器2。
容器模25中,作为形成容器2的部分的凹部的内表面形成为容器2的外表面的形状。而且,容器模25由能够在横向上相对移动的一对分割模29构成。
在容器模25移动到型坯形成模具8的下侧之后,当型坯4配置于一对分割模29之间时,彼此分隔开的一对分割模29彼此接近,分割面彼此相接。在该状态的容器模25内,使型坯4膨胀而形成为容器形状。
另外,容器形成设备6具有形成于吹气针26的第二通风路径32及向第二通风路径32供给加压冷却气体的第二气体供给源33。
第二气体供给源33将作为加压冷却气体的预定压力的常温的空气向吹气针26的第二通风路径32供给。第二通风路径32能够与处于容器模25内的型坯4的内侧连通。由此,加压冷却气体穿过第二通风路径32,在所需的定时吹出到型坯4内。
当基于容器模25的容器2的形成结束时,容器形成设备6的移动机构使容器模25从型坯形成模具8的下侧退避,并且螺旋条形成设备100的移动机构103使螺旋条形成部向型坯形成模具8的下侧移动。这样一来,通过螺旋条形成设备100的移动机构103及容器形成设备6的移动机构而交替地更换螺旋条形成部102与容器模25的位置。
<带内表面螺旋条的容器的制造方法>
带内表面螺旋条的容器的制造方法(以下,称为直接吹塑成型方法。)包括:(1)型坯形成工序,将熔融状态的热塑性树脂3挤压成管状而形成型坯4;(2)螺旋条形成工序,将型坯4扭转而使型坯4的突条407成为螺旋形状;以及(3)容器形成工序,在将在螺旋条形成工序中扭转的型坯4的一端部密封的状态下,通过向容器模25内的型坯4内吹入加压冷却气体而使型坯4膨胀成容器形状并进行冷却,得到容器2。
(型坯形成工序)
在型坯形成工序中,如图8所示,将固体状态的树脂3从树脂材料投入口12投入到加热筒13中。投入到加热筒13中的树脂3接受加热筒13的热量而逐渐地熔融。与此同时,通过由电动机15驱动的挤压螺杆14的挤压力,将熔融的树脂3从加热筒13运送至型坯形成模具8。
到达型坯形成模具8的熔融状态的树脂3通过环状通路19,被向型坯形成模具8的下方挤压。由此,形成管状的型坯4。
另外,在形成型坯4时,从第一通风路径22通过凹槽36吹出加压冷却气体。该加压冷却气体被较弱地加压(例如,0.5~1.0kg/cm2),其压力比容器形成设备6的第二通风路径32的加压冷却气体低。第一通风路径22的加压冷却气体的压力设定为,当将第一通风路径22的加压冷却气体朝向处于软化状态的型坯4吹出时,该型坯4的形状不会实质上地发生变化。
伴随着型坯4的形成,通过型坯形成模具8的心轴18的外周35的凹槽36而在型坯4的内周406形成突条407。在该突条407处,型坯4的壁厚相对地增厚。
加压冷却气体(图3的F1)当从第一通风路径22的吹出口50吹出时,沿着型坯4的内周406的突条407向心轴18的径向外方流动,而且,沿心轴18的轴向A1朝向下方流动。而且,加压冷却气体沿着突条407从突条407的顶部逐渐地向其周边流动。最终,加压冷却气体被吹入到型坯4内。
-在容器内表面形成突条的工序的详情-
在形成型坯4时,使加压冷却气体从心轴18的吹出口50(参照图4)沿着型坯4的内周406的突条407流动。这是对型坯的内表面的突条407进行冷却的冷却工序。由此,能够集中地对型坯4的突条407进行冷却,能够将型坯4的突条407的形状维持得不会变形。因此,例如,在使以上述方式形成的型坯4膨胀而形成为容器形状时,能够抑制突条407的形状变形,其结果是,能够在容器2的主体部203的内周面206形成形状精度良好的螺旋条207。
另外,通过来自第一通风路径22的加压冷却气体,在通过凹槽36内的突条407的表面与凹槽36的内表面之间形成较薄的气体层,因此热塑性树脂3在凹槽36内容易流动。其结果是,能够进一步提高容器2的螺旋条207的形状精度。
另外,第一通风路径22的吹出口50配置于凹槽36的最上游侧端部的底部(参照图3)。由此,加压冷却气体能够在形成型坯4的突条407之后立即开始进行冷却。
另外,第一通风路径22的吹出口50形成于作为形成凹槽36的构件的凹槽形成构件38,因此将吹出口50与凹槽36彼此高精度地定位。由此,能够使来自第一通风路径22的加压冷却气体切实地沿着凹槽36。其结果是,能够进一步提高容器2的螺旋条207的形状精度。
(螺旋条形成工序)
在型坯形成工序中,伴随着树脂3被挤出,型坯4从型坯形成模具8垂下。然后,在螺旋条形成工序中,如图8所示,当传感器108检测到型坯4垂下至预定位置时,一对臂部105夹持型坯4的外周面的下侧部分(夹持工序)。此时,型坯4的下侧部分成为被一对臂部105的夹持力压扁的状态。其后,在夹持型坯4的状态下将型坯4与突条407一起向周向扭转(扭转工序)。由此,突条407向螺旋条变形。在此,该扭转工序优选绕着型坯4的轴扭转型坯4。
另外,在扭转型坯4的情况下,考虑到型坯4的复原力,可以稍多地扭转。例如,在形成扭转了3/4圈的螺旋条的情况下,考虑到型坯4因复原力会返回1/4圈,将型坯4扭转1圈。由此,能够形成所期望的螺旋条。
(容器形成工序)
接下来,在容器形成工序中,如图9所示,将一对分割模29以打开的状态定位在突条407成为螺旋形状的型坯4的外侧(图9的右侧的分割模29)。此时,型坯4是从模具垂下的状态。其后,通过一对分割模29夹持型坯4而将型坯4的下侧密封(图9的左侧的分割模29)。在该夹持时,被一对臂部105压扁的型坯4的下端部分被切断。接下来,下端部被密封的型坯4的上端部在切断面S(参照图9)处由热切割器(未图示)切断。
在此,型坯4为半固体状态,因此在刚被热切割器切断之后,型坯4的切断面中的与螺旋条207相关的部分向下侧垂下,型坯4的切断面呈凹凸状。这可以认为是由于螺旋条207从型坯4的内周面向径向突出而引起的。螺旋条207从型坯4的内周面突出的长度越长,则螺旋条207越容易因自重而向下侧垂下。然而,在一个实施方式的制造方法中,型坯的内表面的螺旋条207通过冷却工序而冷却,因此螺旋条207的部分变硬。由此,在刚被热切割器切断之后,螺旋条207的切断面的部分未垂下,型坯4的切断面仍平坦。型坯4的切断面相当于容器2的口部202的开口端面205。因此,不需要进行用于使口部202的开口端面205平坦的切削加工等,也不会出现因切削加工等而产生的毛刺进入容器2中的情况。
来自第一通风路径22的加压冷却气体在从型坯4开始形成的时刻至型坯4的预定部被切断为止的期间被吹出。另外,加压冷却气体也可以在所需的定时吹出。
接下来,向被切断的型坯4的上端部的开口插入打入装置27的吹气针26(图9的左侧的分割模29)。其后,从吹气针26的第二通风路径32的吹出口将约0.39~0.49MPa的加压空气吹入到底部被封闭的型坯4内。由此,在高温下处于半固体状态的型坯4发生膨胀。其结果是,型坯4的壁厚变薄,并且型坯4沿着容器模25的内表面。由此,容器2以半固体状态形成。
在型坯4发生膨胀时,抑制螺旋状的突条407处的半固体状态的型坯4在周向上的拉伸,与此相对地,无法抑制相邻的突条407之间的半固体状态的型坯4在周向上的拉伸。其结果是,在容器2的主体部203的内周面206形成突条207。
接下来,通过对容器模25进行冷却而使容器2固体化。然后,使一对分割模29彼此分隔开,从一对分割模29拆卸容器2。
另外,作为通过第一通风路径22及第二通风路径32的加压冷却气体,并不局限于空气,也可以是与形成型坯4的树脂3不反应的气体,例如惰性气体。
(其他实施方式)
另外,关于本实施方式,可以考虑以下的变形例。在以下的说明中,以与上述的实施方式不同的点为中心进行说明。另外,关于其他结构,与上述的实施方式相同。
例如,在型坯形成工序中,也可以是,使加压冷却气体从第一通风路径22通过凹槽36吹入到型坯4内,由此使处于容器模25内的型坯4发生膨胀,其后,将型坯4的预定部切断。
另外,虽然未图示,吹出口50也可以配置在心轴18的轴向A1上的凹槽36的中间部。
另外,虽然未图示,也可以是,第一通风路径22的第二部分风路52具有吹出口50,且由形成于心轴18的主体部37的端面并沿心轴18的径向延伸的槽及凹槽形成构件38的第一端面来区划出。而且,也可以是,第一通风路径22的第二部分风路52由形成于心轴18的主体部37的端面并沿心轴18的径向延伸的槽及与该槽相对地形成于凹槽形成构件38的第一端面并沿心轴18的径向延伸的槽来区划出。
另外,在一个实施方式的螺旋条形成设备100中,一对臂部105从型坯4的下侧抓持型坯4,但是未限定于此,例如,一对臂部105也可以从型坯4的侧方抓持型坯4。在这种情况下,通过使位于型坯4的径向外方的一对臂部105向型坯4的周向旋转来扭转型坯4。即使在在这种情况下,也能够形成与一实施方式相同的螺旋条。
另外,在一个实施方式的螺旋条形成设备100中,夹持构件为一对臂部105,但是未限定于此,例如,可以将三个以上的臂部设置于筒状的开闭机构整周。而且,也可以是夹持构件形成为筒状,该筒状的夹持构件通过嵌合于型坯4的下端开口来夹持型坯4。
另外,在一个实施方式的螺旋条形成设备100中,传感器108配置于一对臂部105的侧方,但是未限定于此,例如,也可以将传感器108在一对臂部105的下侧且位于臂部间的对称线上朝上配置。在这种情况下,也可以在开闭机构的上表面固定传感器。
除此之外,在权利要求书所记载的事项的范围内能够实施各种设计变更。
产业上的可利用性
以上,如所说明地,本发明对于带内表面螺旋条的容器的制造方法及其制造装置发挥作用。
标号说明
1 直接吹塑成型装置
2 容器
3 树脂
4 型坯
8 型坯形成模具
18 心轴
19 环状通路
20 型坯形成模具主体
22 第一通风路径
35 心轴的外周
36 凹槽
100 螺旋条形成设备
102 螺旋条形成部
105 一对臂部(夹持部)
107 旋转电动机(旋转部)
206 容器的内周
207 容器的突条
406 型坯的内周
407 型坯的内周的突条。

Claims (3)

1.一种带内表面螺旋条的容器的制造方法,其特征在于,包括如下的工序:
型坯形成工序,形成在内表面具有突条的管状的型坯;
螺旋条形成工序,将所述型坯形成工序后的型坯的突条形成为螺旋条;
容器形成工序,使所述螺旋条形成工序后的型坯从内侧膨胀而形成容器;以及
冷却工序,对所述型坯的内表面的突条进行冷却,
所述冷却工序与所述型坯形成工序及所述螺旋条形成工序一起进行,
所述螺旋条形成工序包括:夹持工序,对在所述型坯形成工序时被从形成所述型坯的模具挤出而垂下的所述型坯的外周面进行夹持;以及扭转工序,保持在所述夹持工序中夹持所述型坯的状态而使所述型坯与所述突条一起向周向扭转,保持所述容器的外周面形状并将所述突条形成为螺旋条。
2.一种带内表面螺旋条的容器,通过权利要求1所述的制造方法来制造。
3.一种带内表面螺旋条的容器的制造装置,其特征在于,具有:
型坯形成设备,形成在内表面具有突条的管状的型坯,并且,在将所述型坯的突条形成为螺旋条的同时,利用通过通风路径而吹入所述型坯内的加压冷却气体对型坯的内表面的突条进行冷却;
螺旋条形成设备,将所述型坯的突条形成为螺旋状;以及
容器形成设备,使所述突条成为螺旋状的型坯从内侧膨胀而形成容器,保持所述容器的外周面形状并将所述突条形成为螺旋条,
所述螺旋条形成设备具备:夹持部,对被从所述型坯形成设备所具有的模具挤出而垂下的所述型坯的外周面进行夹持;以及旋转部,为了使所述型坯与所述突条一起向周向扭转,使所述夹持部与所述型坯一起向所述型坯的周向旋转。
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