CN103930351A - 方型树脂制容器以及吹塑成型模具 - Google Patents
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Abstract
本发明提供薄壁且良好地维持光泽性以及透明性等外观的方型树脂制容器以及用于对所述容器进行双轴延伸吹塑成型的吹塑成型模具。在方型树脂制容器的吹塑成型模具中,将与所述方型树脂制容器的躯干部的侧壁部对应的吹塑成型模具的腔表面的残脊高度设为3至30μm而进行双轴延伸吹塑成型,形成为躯干部的壁厚为0.5mm以下且在所述躯干部的侧壁部的外表面形成有深度为3至30μm的水平方向加工部的方型树脂制容器。
Description
技术领域
本发明涉及横截面形状为方型的树脂制容器(以下称作方型树脂制容器)以及对该方型树脂制容器进行双轴延伸吹塑成型的吹塑成型模具,尤其涉及瓶状的被赋予耐热性的方型树脂制容器以及对该方型树脂制容器进行双轴延伸吹塑成型的吹塑成型模具。
背景技术
以往,如下的树脂制容器作为以各种饮料为内容物的饮料用容器而在广泛领域中普遍应用,该树脂制容器使用聚对苯二甲酸乙二醇酯等聚酯树脂而进行注塑成型、或者进行压缩成型而形成塑坯,接着将该塑坯利用双轴延伸吹塑成型等而成型为瓶状而成。
向所述双轴延伸吹塑成型提供的吹塑成型模具通过对铝合金等材料进行切削加工并使用球头立铣刀来切削,从而形成与希望的瓶形状相配合的空间(以下称作腔)。通常在切削加工的最后的工序中,使用直径2mm的球头立铣刀而将进给间距设为0.05mm左右进行切削,将腔表面的基于球头立铣刀的切削加工痕迹的高度(以下称作残脊高度)设为0.3μm左右。然后,在该切削加工后研磨吹塑模具的腔表面而进行镜面抛光(JISB0601所规定的Rz0.01左右),使用该吹塑成型模具而进行双轴延伸吹塑成型,从而获得具有光泽性、透明性的树脂制容器。其中,在基于外观设计上的理由而要求树脂制容器的外表面消光或者降低透明性的情况下,也可以之后再进行喷砂处理等表面粗糙化的表面处理等。
近年来,以低成本化、废弃物的减少等为目的,为了减少材料树脂的使用量而使树脂制容器薄壁化的要求高涨,然而在使所述容器薄壁化的情况下,必然由于作为容器的强度降低而变得容易变形。尤其在方型树脂制容器中,在打开吹塑成型模具而进行所述容器脱模时,产生如下问题:与角面部相比面积较大的侧壁部41黏在模具表面而向外侧被拉拽,如图4所示,使先脱模了的角面部42向容器内侧凹状变形地进行作用。该现象在为了对方型树脂制容器赋予耐热性而在双轴延伸吹塑成型时将模具温度加热至结晶化温度的高温的双轴延伸吹塑成型中变得更加显著,例如在专利文献1等中,为了防止与容器的薄壁化相伴的脱模时的变形,而提出有将切削加工后的腔表面设为表面粗糙化处理面的方型树脂制容器。
另外,在吹塑成型模具中,将加热后的塑坯安装到吹塑成型模具,吹入高压空气而成型树脂制容器,但当吹塑成型模具的腔表面为镜面时,在所述容器与腔表面之间残留空气,在容器的表面形成痘痕状的空气的积存痕迹,产生降低了外表美观这样的问题。因此,在专利文献2等中,提出有通过向切削加工后的腔表面吹送砂而形成为褶皱状的粗糙面,由此在被延伸的树脂与腔表面之间形成间隙而供空气逸出的吹塑成型模具。
在先技术文献
专利文献
专利文献1:日本特开2009-241971号公报
专利文献2:日本专利2833317号公报
发明内容
发明要解决的课题
然而,在专利文献1以及专利文献2中的任一种情况下,在切削加工后进行使吹塑成型模具的腔表面成为粗糙面的处理,因此将该粗糙面转印在容器,与外观设计上的理由无关地显著降低光泽性以及透明性。因此,本发明是鉴于所述情况而完成的,其目的在于提供薄壁且良好地维持光泽性以及透明性等外观的方型树脂制容器以及用于制造所述方型树脂容器的吹塑成型模具。
用于解决课题的手段
根据本发明,提供一种方型树脂制容器,其躯干部的壁厚为0.5mm以下,所述方型树脂制容器的特征在于,在所述躯干部的侧壁部表面形成有深度为3至30μm的水平加工部。
而且,在本发明的方型树脂制容器中,优选的是,所述水平加工部的相邻山顶间的距离为0.1至1.0mm。
另外,根据本发明,提供一种吹塑成型模具,其对躯干部的壁厚为0.5mm以下的方型树脂制容器进行双轴延伸吹塑成型,其中,与所述躯干部的侧壁部对应的吹塑成型模具的腔表面的残脊高度为3至30μm。
而且,在本发明的吹塑成型模具中,优选的是,所述残脊高度的相邻山顶间的距离为0.1至1.0mm。
发明效果
根据本发明的方型树脂制容器,能够形成为薄壁且良好地维持光泽性、透明性等外观的方型树脂制容器。
另外,根据本发明的方型树脂制容器的吹塑成型模具,无须在切削加工后进行使表面粗糙化的表面处理,在将双轴延伸吹塑成型后的方型树脂制容器从吹塑成型模具的腔表面脱模时,大幅度降低脱模阻力而防止所述容器的变形,能够容易成型使薄壁的光泽性、透明性等外观变得优良的方型树脂制容器。
附图说明
图1是表示本发明的方型树脂制容器的图,(a)是俯视图,(b)是主视图,(c)是侧视图,(d)是表示脱模阻力降低化面的区域的图。
图2是斜视表示本发明的吹塑成型模具的腔表面的加工状态的概略图。
图3是本发明的吹塑成型模具的一方的分型模具的立体图。
图4是表示对现有的吹塑成型模具中的方型树脂制容器进行脱模时的躯干部横截面的变形状态的示意图。
具体实施方式
以下,参照附图对本发明的优选实施方式进行说明。
在本实施方式中,方型树脂制容器1是例如将利用公知的注塑成型、压缩成型等而制造出的由热塑性树脂构成的有底筒状的塑坯通过双轴延伸吹塑成型而成型的容器,具备口部2、肩部3、躯干部4以及底部5,与所述躯干部的高度方向正交的横截面形状为方型,矩形状的内压调整板件46形成在所述躯干部4的侧壁部41。
作为构成方型树脂制容器1的热塑性树脂,只要能够进行双轴延伸吹塑成型,则能够使用任意的树脂。具体来说,优选为聚对苯二甲酸乙二醇酯、聚对苯二甲酸丁二醇酯、聚萘二甲酸乙二醇酯、聚碳酸酯、聚芳酯、聚乳酸或者它们的共聚物等热塑性聚酯、与这些树脂或者其他树脂混合而成的物质或层叠而成的物质等。
尤其是,优选使用聚对苯二甲酸乙二醇酯等对苯二甲酸乙二醇酯系热塑性聚酯。另外,也能够使用丙烯腈树脂、聚丙烯、丙烯-乙烯共聚物、聚乙烯等。
在图1所示的方型树脂制容器1中,口部2设为圆筒状,在口部2的外周设有用于安装未图示的盖体的螺纹部,在填充有内容物之后,将盖体安装于口部2而密封方型树脂制容器1。
肩部3位于口部2与躯干部4之间,形成为从口部2扩径并且与躯干部4连接。
躯干部4是占据方型树脂制容器1的高度方向的多半的部分,在本实施方式中,与高度方向正交的横截面形状设为对角部进行了倒角的矩形状。由此,方型树脂制容器1的躯干部4由对置的两组侧壁部41与位于各侧壁部41之间的角面部42构成,方型树脂制容器1被设为横截面形状是方型的容器。需要说明的是,在本实施例中,在躯干部4的上端侧具有锥形部44。
需要说明的是,高度方向是指以口部2为上而使容器1直立于水平面时,与水平面正交的方向,水平方向同样指与水平面平行的方向,在该状态下规定方型树脂制容器1的上下以及纵横的方向。
在此,在躯干部4的高度方向中央附近,形成有在整周上延伸的环状凹部45。而且,在侧壁部41,在环状凹部45的上侧以及下侧分别形成有内压调整板件46。内压调整板件46形成为,在以高温密封填充有内容物之后冷却而造成容器内的压力减少时等,基于其变形而吸收内压的减少。
另外,在侧壁部41沿着其与角面部42之间的分界线而形成有纵槽47。通过形成这样的纵槽47,能够补充与方型树脂制容器1的薄壁化相伴的强度降低,在提高相对于来自横向的负载的强度的同时,即使方型树脂制容器1发生变形,也能够容易恢复形状。
本实施方式的方型树脂制容器1的脱模阻力降低化面43如图1(d)中由影线所示,在除去口部2、肩部3、躯干部4的内压调整板件46以及底部5的躯干部4的侧壁部41的外表面形成为水平方向加工部。
需要说明的是,图1(d)中,单点划线的左侧所示的部分相当于图1(b)所表现的方型树脂制容器1的正面,单点划线的右侧所示的部分相当于图1(c)所表现的方型树脂制容器1的侧面。在本实施方式的方型树脂制容器1的躯干部4中,将除去内压调整板件46的躯干部4的侧壁部41的外表面设为脱模阻力降低化面43,但也可以根据需要将所述内压调整板件46也设为脱模阻力降低化面43。
而且,所述躯干部4的壁厚为0.5mm以下,优选为0.2至0.4mm的薄壁,所述脱模阻力降低化面43的水平方向加工部的深度为3至30μm,通过设为这样的结构,能够形成为薄壁且良好地维持光泽性、透明性等外观的方型树脂制容器。
另外,通过将所述水平加工部的相邻山顶间的距离设为0.1至1.0mm,能够进一步形成为可良好地维持光泽性、透明性等外观的方型树脂制容器。
就成型在该方型树脂制容器1的躯干部4的侧壁部41形成的脱模阻力降低化面43的、吹塑成型模具8的腔表面而言,图2所示的残脊高度Hs为3至30μm,加工痕迹7的相邻山顶间的距离在相对于加工方向的法线方向的测定下为0.1mm至1.0mm。然后,使用具有所述腔表面的吹塑成型模具8而对所述的有底筒状的塑坯进行双轴延伸吹塑成型,转印加工痕迹7,从而获得具有形成了由所述水平加工部构成的所述脱模阻力降低化面43的躯干部4的方型树脂制容器1。
而且,如此制造的方型树脂制容器1的躯干部4的侧壁部41的外表面成为脱模阻力降低化面43,因此大幅度降低了来自吹塑成型模具8的脱模阻力,并且不会产生使角面部42朝容器内部弯折的力,因此可防止角面部42的凹陷。
因而,在吹塑成型模具8的腔表面的切削加工以及精加工之后,无须另外进行形成粗糙面的表面处理加工就能够大幅度降低脱模阻力,在薄壁的方型树脂制容器中,能够使光泽性、透明性等外观显著地变得优良。
另外,作为所述腔表面的加工方法,例如通过将球头立铣刀M的直径R设为8mm、将进给间距P设为0.4mm,使残脊高度Hs为5.3μm。
然后,在残脊高度不足3μm的情况下,方型树脂制容器1受到的来自吹塑模具8的脱模阻力增加,并且放气性差,因此局部地在方型树脂制容器1与腔的面之间残留空气,在方型树脂制容器1的所述躯干部4的侧壁部41的脱模阻力降低化面43的外表面出现痘痕状的光泽性差的部分。另一方面,当超过30μm时所述方型树脂制容器1的脱模性提高,但光泽性、透明性显著降低,并且在施加落下等冲击的情况下外表面有时发生层剥离。
另外,如图3所示,吹塑模具8的腔表面的加工痕迹7在单向统一地形成,这种设置在视觉上提高双轴延伸吹塑成型后的方型树脂制容器1的外观的观点下是优选的,并且形成为使基于立铣刀的切削加工的方向与高度方向正交,由于加工痕迹7与吹塑成型模具8的分割面81以最短距离交叉,因此在双轴延伸吹塑成型时将腔内的空气从吹塑成型模具8的分割面81高效地排出,这种设置在视觉上进一步提高基于空气的残留的方型树脂制容器1的外观的观点下是优选的。
需要说明的是,根据需要,为了去除吹塑成型模具8的腔表面的加工痕迹7的微小毛刺,优选实施喷丸处理等精加工。在本实施方式中,在利用球头立铣刀对吹塑成型模具8的腔表面进行了切削加工之后,利用直径为1至10μm的研磨磨料进行喷击。测定最终吹塑成型后的方型树脂制容器1的脱模阻力降低化面43的凹凸形状时,凹凸深度平均为5.0μm,相邻山顶间的距离平均为0.4mm,加工痕迹7的形状以大致相同的状态转印。
以上,关于本发明,表示优选的实施方式而进行了说明,但本发明并不限定于所述的实施方式,能够在不脱离本发明的主旨的范围内添加各种变更。例如,在图示的方型树脂制容器1中,示出了躯干部4与肩部3经由锥形部44而连结的结构,但也可以根据需要而不形成锥形部44。另外,至少将躯干部4的侧壁部41设为脱模阻力降低化面43即可,也可以适当地将内压调整板件46、角面部42、环状凹部45以及纵槽47等设为脱模阻力降低化面43。
工业实用性
本发明的方型树脂制容器以及吹塑成型模具尤其能够作为瓶状的被赋予耐热性的方型树脂制容器而进行应用,并且能够作为对该方型树脂制容器进行双轴延伸吹塑成型的吹塑成型模具而适当进行应用。
【符号说明】
1 方型树脂制容器
2 口部
3 肩部
4 躯干部
41 侧壁部
42 角面部
43 脱模阻力降低化面(水平加工部)
44 锥形部
45 环状凹部
46 内压调整板件
47 纵槽
5 底部
7 加工痕迹
8 吹塑成型模具
81 分割面
Claims (4)
1.一种方型树脂制容器,其躯干部的壁厚为0.5mm以下,所述方型树脂制容器的特征在于,
在所述躯干部的侧壁部的外表形成有深度为3至30μm的水平方向加工部。
2.根据权利要求1所述的方型树脂制容器,其特征在于,
所述水平方向加工部的相邻山顶间的距离为0.1至1.0mm。
3.一种吹塑成型模具,其对躯干部的壁厚为0.5mm以下的方型树脂制容器进行双轴延伸吹塑成型,其中,
与所述躯干部的侧壁部对应的吹塑成型模具的腔表面的残脊高度为3至30μm。
4.根据权利要求3所述的吹塑成型模具,其特征在于,
所述残脊高度的相邻山顶间的距离为0.1至1.0mm。
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JPH05185498A (ja) * | 1992-01-16 | 1993-07-27 | Toppan Printing Co Ltd | ブロー成形金型及びブロー成形金型の製造方法並びにブロー成形方法 |
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US20140224814A1 (en) | 2014-08-14 |
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