CN1286632C - 双轴拉伸吹塑成形方法 - Google Patents
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Abstract
本发明涉及一种双轴拉伸吹塑成形法,所述双轴拉伸吹塑成形法包括下述步骤:将预型坯双轴拉伸吹塑成形为一次中间成形品的一次吹塑成形步骤;在加热炉中加热此一次中间成形品使之强制收缩成形为二次中间成形品的步骤;吹塑成形此二次中间成形品使之成形为瓶体的二次吹塑成形步骤;其特征在于,将二次吹塑成形步骤开始前的二次中间成形品温度设定为高于二次吹塑成形步骤用的模具的模具温度40℃或40℃以上、或50℃或50℃以上,由此能够对应瓶体所要求的耐热性,决定双轴拉伸吹塑成形的条件,从而能够高生产率地提供具有所要求耐热性的瓶体。
Description
技术领域
本发明涉及聚对苯二甲酸乙二醇酯树脂制的双轴拉伸吹塑成形瓶体的成形方法,更具体而言,涉及一种在保持高透明性的状态下,成形对热收缩具有高耐热性的聚对苯二甲酸乙二醇酯树脂制的双轴拉伸吹塑成形瓶体的方法。
背景技术
由于聚对苯二甲酸乙二醇酯树脂(下面简称为PET)具有稳定的物性、无公害性、优良的透明性、及高机械强度等,因此作为双轴拉伸吹塑成形瓶体,被大量应用在各个方面,特别是在食品用瓶体方面,具有非常重要的实用性。
虽然PET制瓶体能够有效地发挥多种优良特性,但是,未经过热处理的PET制双轴拉伸吹塑成形瓶体对热的耐受能力差,在70度或70度以上的高温下,容易发生变形。
因此,非常期待耐热性高的PET制瓶体的出现,作为赋予此PET制瓶体耐热性的方法,本发明者开发出了称为“双轴拉伸吹塑”的方法(参见特公平4-56734号公报),能够用作在120℃的条件下进行约30分钟热处理的蒸馏食品,或在其他的收纳情况下用作被热处理的食品的收纳容器。
此双轴拉伸吹塑成形技术包括下述步骤:将预成形为所希望形状的预型坯(preform)双轴拉伸吹塑成形为一次中间成形品的一次吹塑成形步骤,加热此一次中间成形品使之热收缩、成形为二次中间成形品的成形步骤,最后为将此二次中间成形品吹塑成形为瓶体的二次吹塑成形步骤;通过加热一次中间成形品使之收缩,能够削减一次中间成形品内产生的残留应力,得到促进了结晶化的、耐热性极高的瓶体。
但是,近来不仅蒸馏商品需要采用耐受120℃高温的高耐热性容器,从内容物加热填充的必要性方面考虑,要求具有80~95℃左右耐热性的容器也有很广泛的用途,从生产速度或节省能源的观点考虑,要求一种具有相应的耐热性、高生产率的双轴拉伸吹塑成形法。
因此,本发明是对应上述要求而提出的,以开发适应瓶体所要求的耐热性的双轴拉伸吹塑成形法为技术课题,能够以高生产率提供具有所要求耐热性的瓶体。
发明内容
解决了上述课题的本发明中,本申请第1项发明所述的发明方法涉及一种双轴拉伸吹塑成形法,所述双轴拉伸吹塑成形法包括下述步骤:将预型坯(preform)双轴拉伸吹塑成形为一次中间成形品的一次吹塑成形步骤;加热一次中间成形品,使之强制收缩成形为二次中间成形品的步骤;吹塑成形二次中间成形品,使之成形为瓶体的二次吹塑成形步骤;
其特征在于,将二次吹塑成形步骤开始前的二次中间成形品温度设定为高于二次吹塑成形步骤用的模具温度40℃或40℃以上。
双轴拉伸吹塑成形技术包括下述步骤:将预成形为所希望形状的预型坯双轴拉伸吹塑成形为一次中间成形品的一次吹塑成形步骤,加热此一次中间成形品、使之强制热收缩成形为二次中间成形品的步骤,最后为吹塑成形此二次中间成形品使之成形为瓶体的二次吹塑成形步骤。
在一次吹塑成形步骤中,将预型坯加热至80~120℃,使之双轴拉伸吹塑成形为一次中间成形品,80~120℃的温度是包括作为接近PET热结晶化温度的120℃、能够显示出拉伸效果的可吹塑成形温度。
另外,对应所要求的耐热温度,将二次吹塑成形步骤用的模具温度(以下简称为二次吹塑模具温度)设定在约(耐热温度)~(耐热温度+30℃)的范围内。由此能够除去二次吹塑成形时的残留应力,抑制在瓶体所要求的耐热温度下的变形。
本申请第1项发明所述的成形方法是,通过将二次吹塑成形步骤开始前的二次中间成形品温度(下面简称为二次吹塑前温度)设定为高于上述二次吹塑模具温度40℃或40℃以上,由此能够获得二次吹塑成形步骤中的良好赋形性。
即,在低于40℃的情况下,由于二次中间成形品的温度在短时间内达到模具温度,二次吹塑成形步骤中的赋形性变差,对于完成瓶体而言,难以获得良好的壁厚均匀性以及凹凸部、边缘部等形状的重现性。
本申请第2项发明所述的发明方法为将本申请第1项发明中的二次吹塑前温度设定为高于二次吹塑模具温度50℃或50℃以上。
与具有80~95℃较低耐热性的瓶体的成形相比,为了获得具有蒸馏食品用等较高耐热性的瓶体,而提高二次吹塑模具温度,对应此模具温度,将二次吹塑前温度设定为较高温度,根据本申请第2项发明所述的成形方法,将二次吹塑前温度设定为高于二次吹塑模具温度50℃或50℃以上,由此必然能够获得80~95℃左右的耐热性,即使成形具有较高耐热性的瓶体,也能够获得良好的赋形性。
二次吹塑前温度的上限由下述一次中间成形品的加热温度上限和设定时间(set time)决定。
本申请第3项发明所述的发明方法为,在本申请第1项或第2项所述的发明中,在加热后、即从加热炉中取出后的20秒以内,将二次中间成形品设置在二次吹塑模具内。
将一次中间成形品放入加热炉内等进行加热,使之强制热收缩,得到二次中间成形品,此一次中间成形品的加热温度取决于在将此二次中间成形品从加热炉中取出、到设置在二次吹塑模具中所需时间(下面简称为设定时间)内的冷却、及上述二次吹塑成形前的二次中间成形品的温度。由加热而升高的一次中间成形品温度的上限约为235℃,如果超过此温度,则由一次吹塑成形生成的PET微结晶部分熔解,进行热重结晶化而发生泛白。
本申请第3项发明所述的成形方法虽然将设定时间设定在20秒以内,但是,由于存在由上述约235℃的加热而设定的一次中间成形品温度的上限,因此,如果由于从加热炉移至室温环境时的冷却速度,使得设定时间超过20秒,则在二次吹塑成形前,二次中间成形品的温度过度下降,难以将二次吹塑前温度保持在高于二次吹塑模具温度40℃或40℃以上,也难以提供满足内容物加热填充之类的多种用途的、具有80~95℃左右耐热性的瓶体。
另一方面,由于制造装置的配置等原因,即使不能将设定时间控制在数秒左右,通过将此设定时间设定在20秒以内,也能够获得内容物加热填充用的、具有80~95℃左右耐热性的瓶体,能够适应广泛的应用领域。
本申请第4项发明所述的发明方法为,在本申请第3项发明中,将加热的二次中间成形品置于二次吹塑成形步骤用的模具内的设定时间设定在6秒以内。
如果设定时间在6秒以内,则能够减小室温环境下的温度降低,能够制造具有高耐热性的瓶体,也能够充分适应用于蒸馏食品的120℃的耐热性。另外,制造具有80~95℃左右耐热性的瓶体时,设定时间越短,越能够降低加热炉内一次中间成形品的加热温度,从缩短制造时间、节省能源等方面考虑,能够提高生产效率。
如上所述,根据本发明的方法,通过将二次吹塑前温度及设定时间设定在适当的范围内,能够适当决定一次中间成形品的加热温度,对应所要求的耐热性,能够提供一种生产效率高的成形条件。
附图说明
图1是并列示出本发明成形方法的各步骤成形品的正面图的说明图。
具体实施方式
以下边参照附图边说明本发明。
图1并列示出了本发明的双轴拉伸吹塑成形方法的一个实施方案的预型坯1、一次中间成形品4、二次中间成形品5及作为最终成形品的瓶体6的正面图。
本发明的双轴拉伸吹塑成形方法包括以下步骤:将预型坯1双轴拉伸吹塑成形为一次中间成形品4的一次吹塑成形步骤,加热此一次中间成形品4的除瓶口部3之外包含底部及瓶身的本体部2,使之强制热收缩成形为二次中间成形品5的步骤,最后将此二次中间成形品5吹塑成形为瓶体6的二次吹塑成形步骤。
一次吹塑成形步骤与通常的双轴拉伸吹塑成形操作完全相同即可。接下来,加热一次中间成形品4使之强制热收缩成形为二次中间成形品5的步骤,用于强制削减双轴拉伸吹塑成形品内产生的内部残留应力,同时促进结晶化。使用一次吹塑成形步骤用的模具,顺应双轴拉伸吹塑成形的一次中间成形品4的各拉伸成形部分内发生的内部残留应力,使此一次中间成形品4的各拉伸成形部分自由变形,从而强制削减上述的内部残留应力。
顺应此一次中间成形品4的各拉伸成形部分内发生的内部残留应力的变形为自然而然的收缩变形,为了使利用此收缩变形而成形的二次中间成形品5的拉伸成形部分,即本体部2,如图1所示,与作为成形目的物的瓶体6的拉伸成形部分的、包含底部的瓶身部基本相同或略小,而设定从预型坯1至一次中间成形品4的拉伸成形倍率及一次中间成形品4的尺寸。
虽然最后的二次吹塑成形步骤,与一次吹塑成形步骤相比,拉伸倍率小,但是也能够利用通常的双轴拉伸吹塑成形方法进行。
实施例
将预型坯1的加热温度设定为115℃,按表1所示的成形条件进行双轴拉伸吹塑成形,获得实施例1至实施例4的PET制瓶体。预型坯、一次中间成形品、二次中间成形品及瓶体的形状分别如图1(a)、(b)、(c)及(d)所示。
表1
一次模具温度(℃) | 加热温度(℃) | 二次吹塑温度(℃) | 设定时间(sec) | 二次模具温度(℃) | 耐热温度(℃) | |
实施例1 | 140 | 170 | 150 | 6 | 90 | 87 |
实施例2 | 160 | 190 | 165 | 6 | 105 | 93 |
实施例3 | 180 | 230 | 200 | 6 | 140 | 蒸馏热处理 |
实施例4 | 190 | 230 | 140 | 20 | 90 | 87 |
比较例1 | 170 | 210 | 125 | 20 | 90 | - |
表1中,一次模具温度表示一次吹塑成形步骤用的模具温度,加热温度表示由加热炉取出后二次中间成形品的温度,二次模具温度表示二次吹塑模具温度。
实施例1中,二次吹塑模具温度设定为90℃,设定时间设定为6秒,二次吹塑前温度设定为比二次吹塑模具温度高60℃的150℃,在此条件下进行成形。
另外,为了使二次吹塑前温度为150℃,考虑到设定时间内的冷却,而调整加热炉内一次中间成形品的加热,将从加热炉中取出后的二次中间成形品的温度设定为170℃。即,在6秒的设定时间内,温度下降20℃。
经过设定时间二次中间成形品的温度降低,取决于由加热炉中取出时的温度和室内温度的温度差,在约3~5℃/sec的范围内,根据此冷却速度和设定时间,能够决定取出时的温度,即在加热炉内将一次中间成形品加热到何种程度。
在这样的成形条件下获得的瓶体6的壁厚均匀性、形状重现性良好,另外,此瓶体6的耐热温度为87℃。
另外,由表1所示的成形条件,获得实施例2、3及4的瓶体6。对于任一瓶体6,壁厚的均匀性、形状的重现性均良好,其耐热温度分别为表1所示数值。由此可知,实施例3的瓶体6可用于120℃下30分钟的蒸馏食品用的热处理,如果设定时间在6秒以内,则能够适应宽范围的耐热性要求。
另外,实施例4的设定时间为20秒,加热温度为230℃,由此能够确保二次吹塑前温度比二次吹塑模具温度90℃高50℃,能够能够获得具有87℃耐热性的瓶体6,即使因为制造装置的配置等原因,设定时间无法为数秒左右,通过将设定时间设定在20秒以内,也能够获得可进行内容物的加热填充、具有80~95℃左右耐热性的瓶体6,能够适用于广泛的应用领域。
但是,如果设定时间超过20秒,则加热温度必须为超过235℃的较高温度,二次中间成形品发生泛白,不能作为产品使用。
比较例1中将设定时间设定为20秒,加热温度设定为210℃,二次吹塑温度为比二次模具温度90℃高35℃的125℃,结果为二次吹塑成形中的赋形性差,另外,在凹凸部、边缘部等处无法良好地重现二次吹塑模具的形状。
由于本发明具有上述构成,因此能够发挥如下效果。
在本申请第1项发明中,通过将双轴拉伸吹塑成形法的二次吹塑前温度设定为高于二次吹塑模具温度40℃或40℃以上,能够获得良好的赋形性,提供壁厚的均匀性高、且模具形状的重现性良好的瓶体。
在本申请第2项发明中,通过将二次吹塑前温度设定为高于二次吹塑模具温度50℃或50℃以上,必然能够获得80~95℃左右的普通耐热瓶体,而且即使在蒸馏食品用具有较高耐热性要求的瓶体的成形中,也能够获得良好的赋形性。
在本申请第3项发明中,通过将设定时间设定在20秒以内,能够获得内容物加热填充用的、具有80~95℃左右耐热性的瓶体,能够适用于广泛的用途领域。
在本申请第4项发明中,通过将设定时间设定在6秒以内,能够提供具有80~95℃左右耐热性、可进行蒸馏食品用的热处理、适应广泛耐热性要求的瓶体,另外能够提高生产速度。
在上述二次吹塑成形中,通过设定二次中间成形品的成形前温度的下限、及二次吹塑模具的设定时间的上限,能够对应于可利用装置或所要求的耐热性,决定生产效率高的成形条件。
Claims (4)
1、一种聚对苯二甲酸乙二醇酯树脂制瓶体的双轴拉伸吹塑成形方法,所述方法包括如下步骤:将预型坯(1)双轴拉伸吹塑成形为一次中间成形品(4)的一次吹塑成形步骤;加热此一次中间成形品(4)使之强制热收缩成形为二次中间成形品(5)的步骤;吹塑成形此二次中间成形品(5)使之成形为瓶体(6)的二次吹塑成形步骤;
其特征在于,将所述二次吹塑成形步骤前的二次中间成形品(5)的温度设定为高于所述二次吹塑成形步骤用模具的模具温度40℃或40℃以上。
2、如权利要求1所述的聚对苯二甲酸乙二醇酯树脂制瓶体的双轴拉伸吹塑成形方法,其中,将二次吹塑成形步骤前的二次中间成形品(5)的温度设定为高于所述二次吹塑成形步骤用模具的模具温度50℃或50℃以上。
3、如权利要求1或2所述的聚对苯二甲酸乙二醇酯树脂制瓶体的双轴拉伸吹塑成形方法,其中,将二次中间成形品(5)在20秒以内设置在二次吹塑成形步骤用的模具内。
4、如权利要求3所述的聚对苯二甲酸乙二醇酯树脂制瓶体的双轴拉伸吹塑成形方法,其中,将二次中间成形品(5)被设置在二次吹塑成形步骤用的模具内的设定时间设定在6秒以内。
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KR101476967B1 (ko) * | 2007-05-31 | 2014-12-24 | 가부시키가이샤 요시노 고교쇼 | 합성수지제 병체 |
US8744336B2 (en) * | 2008-08-27 | 2014-06-03 | Qualcomm Incorporated | Interference detection apparatus and method |
CN102656001B (zh) | 2009-12-25 | 2015-09-02 | 日精Asb机械株式会社 | 大型容器用预塑形坯以及大型容器以及大型容器的制造方法 |
ES2637713T3 (es) * | 2012-01-05 | 2017-10-16 | Amcor Limited | Método y aparato de moldeo para aplicar presión positiva a un recipiente moldeado |
US8795579B2 (en) | 2012-01-27 | 2014-08-05 | Altira, Inc. | Localized shaping for container decoration |
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US5445784A (en) * | 1984-02-15 | 1995-08-29 | Yoshino Kogyosho Co., Ltd. | Method of blow-molding biaxially-oriented polyethylene terephthalate resin bottle-shaped container |
US5248533A (en) | 1984-02-15 | 1993-09-28 | Yoshino Kogyosho Co., Ltd. | Biaxially oriented polyethylene terephthalate resin bottle-shaped container |
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CN1507387A (zh) | 2004-06-23 |
EP1468810A1 (en) | 2004-10-20 |
CA2468808C (en) | 2010-07-06 |
CA2468808A1 (en) | 2003-07-31 |
AU2003237109B2 (en) | 2007-10-25 |
JP4019308B2 (ja) | 2007-12-12 |
WO2003061947A1 (fr) | 2003-07-31 |
US20040262817A1 (en) | 2004-12-30 |
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