CN106232501B - 粘稠内容物的填充方法 - Google Patents
粘稠内容物的填充方法 Download PDFInfo
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- CN106232501B CN106232501B CN201580020349.4A CN201580020349A CN106232501B CN 106232501 B CN106232501 B CN 106232501B CN 201580020349 A CN201580020349 A CN 201580020349A CN 106232501 B CN106232501 B CN 106232501B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
本发明涉及将粘稠内容物填充在容器中的方法,该方法的特征在于:准备内表面由热塑性树脂、特别是烯烃系树脂形成的容器;将食用油或液体石蜡涂布在所述容器的内表面上以形成油膜;将25℃下的粘度为100mPa·s以上的粘稠内容物填充在内表面上已形成所述油膜的容器中。
Description
技术领域
本发明涉及用粘稠内容物填充容器的方法。
背景技术
塑料容器容易成形,可廉价地生产,因而已广泛用于各种用途。特别是,内壁面通过使用如低密度聚乙烯等烯烃系树脂而形成且通过直接吹塑成形而成形的瓶状的烯烃系树脂容器,从内容物可容易地挤出的观点,已期望用作容纳如蛋黄酱和番茄酱等粘稠的浆状或糊状的内容物的容器。
然而,上述粘稠内容物趋于附着并残留在容器的内表面上,且难以将填充在容器中的内容物用到最后一滴。即,由于粘稠内容物对容器内表面的滑落性不足而发生这种问题。
作为满足上述要求的容器,例如专利文献1提出了一种包括MFR(熔体流动速率)为10g/10min以上的烯烃系树脂的最内层的多层结构的瓶。
多层结构的瓶包括对油性内容物具有优异的湿润性的最内层。因此,如果将瓶倒立或倾斜,则如蛋黄酱等油性内容物沿着最内层的表面下滑铺展并可完全排出而不附着或残留在瓶的内壁面上(最内层的表面上)。
对于容纳像番茄酱等植物纤维分散在水中的粘稠的非油性内容物用的瓶,专利文献2和专利文献3提出了具有共混有饱和或不饱和脂肪族酰胺作为润滑剂的最内层的聚烯烃系树脂瓶。
上述专利文献1至3都试图基于形成容器内表面的热塑性树脂组合物的化学组成来改进塑料容器对内容物的滑移性,并在某种程度上实现了滑移性的改进。然而,由于对所用热塑性树脂的种类的限定和对添加剂的限定而对改进滑移性造成了限制,且还未实现显著的改进。
另一方面,专利文献4提出了一种包装材料,所述包装材料包含以相对于100重量份的聚烯烃系树脂为0.3至3重量份的量包含HLB为5.0以下的添加剂的组合物。
另外,本申请人先前已提出了内表面或与内容物接触的表面为液体可浸透的面(liquid permeable surface)且在该液体可浸透的面中保持液体的容器(日本专利申请号2012-199236),和通过使用含有成形用树脂和液体(与内容物非混合性的液体)的树脂组合物形成内表面的容器(日本专利申请号2013-23468)。这些容器在与内容物接触的部分形成液膜,并显示对如番茄酱、酱料和蛋黄酱等流动性内容物的显著改进的滑移性。
然而,这些容器仍伴有关于稳定保持为了改进对内容物的滑移性所形成的液膜的问题,并且进一步改进是必须的。
现有技术文献:
专利文献:
专利文献1:JP-A-2007-284066
专利文献2:JP-A-2008-222291
专利文献3:JP-A-2009-214914
专利文献4:JP-A-6-345903
发明内容
发明要解决的问题
因此,本发明的目的是提供以粘稠内容物可快速从容器中排出的方式用该内容物填充容器的方法。
本发明的另一目的是提供以容器稳定地维持快速地排出容器中的粘稠内容物的效果的方式用该粘稠内容物填充容器的方法。
用于解决问题的方案
根据本发明,提供通过以下来填充粘稠内容物的方法:
提供具有通过使用热塑性树脂形成的内表面的容器;
将食用油或液体石蜡涂布在所述容器的内表面上以在其上形成油膜;和
用25℃下的粘度为100mPa·s以上的粘稠内容物填充内表面上形成有所述油膜的容器。
在本发明的填充方法中,期望:
(1)形成所述容器的内表面的热塑性树脂为烯烃系树脂;
(2)所述油膜的量在5至60g/m2的范围内;
(3)形成所述容器的内表面的热塑性树脂共混有渗出性添加剂(bleedingadditive);
(4)将脂肪酸酯用作所述渗出性添加剂;
(5)所述渗出性添加剂以相对于100重量份的所述热塑性树脂为0.5至5.0重量份的量添加;和
(6)所述容器具有包括通过使用所述烯烃系树脂形成的内表面层的多层结构。
发明的效果
根据本发明的粘稠内容物的填充方法,食用油或液体石蜡的油膜形成在容器的内表面与填充在容器内的粘稠内容物之间。即,使油膜存在于内容物与容器的内表面之间。结果,粘稠内容物在与油膜接触然而不与容器的内表面接触的同时从容器中排出。这说明对粘稠内容物改进的滑移性(落下性),有效地抑制了粘稠内容物被容器的内表面吸附,并且能够使粘稠内容物快速排出而不附着或残留在容器的内表面。
此外,在本发明中,通过一系列的步骤形成油膜并填充粘稠内容物而没有从油膜的形成步骤到粘稠内容物的填充步骤的长时间的空白。因此,这有效地减缓了油膜因其自重而与容器内表面脱离的不便。即,所形成的油膜通过填充在容器内的粘稠内容物来保持。
因此,本发明稳定地发挥基于油膜的形成而排出内容物的改进的效果。
此外,在本发明中,形成容器内表面的热塑性树脂共混有渗出性添加剂以更稳定地维持油膜。即,在通过使用共混有渗出性添加剂的热塑性树脂形成容器的内表面时,渗出性添加剂析出在表面上,形成油膜的液体(食用油或液体石蜡)被析出的渗出性添加剂阻止渗入容器壁内,从而有效减缓诸如油膜量连续减少的不便。
附图说明
[图1]为作为应用于本发明填充方法的容器的最优选实施方案的直接吹塑成形瓶(所述瓶为空容器的状态)的图。
具体实施方式
本发明的粘稠内容物的填充方法通过以下来进行:提供具有预定结构的容器,在容器的内表面上形成食用油或液体石蜡的油膜,和用粘稠内容物填充容器。
<容器中的内容物>
本发明的容纳在容器中的内容物为25℃下的粘度为100mPa·s以上的粘稠内容物。即,粘稠内容物附着至容器的内壁面且不能完全排出或不能容易地用到最后一滴。然而,本发明的填充方法能够使内容物非常高程度地排出。
另外,粘稠内容物可采用如乳化物或非乳化物等任意形态。其具体实例包括蛋黄酱,番茄酱,各种酱料类(伍斯特酱(Worcester sauce)、中浓酱(Semi-sweet sauce)等),水性糊(aqueous paste),蜂蜜,蛋黄酱,芥末,调味汁(dressing),果酱,巧克力酱,如化妆水等化妆液,液体洗涤剂,洗发水和洗剂等。
在上述中,如蛋黄酱等乳化物,特别是,在水包油型乳化物中,油分(脂质)含量为50%以下的那些可特别有效地通过本发明的填充方法来处理。即,在油分含量多的乳化物的情况下,过量的油分在容器的内壁面上形成油膜。结果,显示高滑移性且可相对高效地排出内容物。另一方面,油分含量少的产品不能形成油膜,且内容物的排出性极低。
<容器>
在本发明中,要用粘稠内容物填充的容器为具有通过使用热塑性树脂形成的内表面的容器。这是因为具有通过使用热塑性树脂形成的内表面的容器适于将稍后将描述的食用油或液体石蜡保持在其内表面上,并且能够使油膜容易形成于其上。
对热塑性树脂没有特别的限定,条件是其能够形成容器的内表面。其实例包括低密度聚乙烯,高密度聚乙烯,聚丙烯,聚-1-丁烯,聚4-甲基-1-戊烯,或如乙烯、丙烯、1-丁烯或4-甲基-1-戊烯等α-烯烃的无规或嵌段共聚物,或环烯烃共聚物(如JP-A-2007-284066中公开的那些);如乙烯·乙酸乙烯酯共聚物、乙烯·乙烯醇共聚物和乙烯·氯乙烯共聚物等乙烯·乙烯基系共聚物;如聚苯乙烯、丙烯腈·苯乙烯共聚物、ABS和α-甲基苯乙烯·苯乙烯共聚物等苯乙烯系树脂;如聚氯乙烯、聚偏二氯乙烯、氯乙烯·偏二氯乙烯共聚物、聚(丙烯酸甲酯)和聚(甲基丙烯酸甲酯)等聚乙烯基系树脂;如尼龙6、尼龙6-6、尼龙6-10、尼龙11和尼龙12等聚酰胺树脂;如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以及其共聚的聚酯等聚酯树脂;聚碳酸酯树脂;聚苯醚树脂;和如聚乳酸等生物可降解树脂。
其中,从由其形成容器内表面时其性质优异的观点,烯烃系树脂和聚酯树脂是合适的。具体地,烯烃系树脂不仅适用于保持油膜而且还富有挠性,并且可特别期望地在用于有利地挤出容纳在其中的粘稠内容物的直接吹塑成形瓶的成形中使用。其中,低密度聚乙烯(LDPE)最为适合。
另外,本发明中,期望用于形成容器内表面的热塑性树脂共混有渗出性添加剂。即,在本发明中,在填充内容物之前,在容器的表面上形成食用油或液体石蜡的油膜。这里,如果渗出性添加剂已添加到以烯烃系树脂为代表的热塑性树脂,则已渗出在容器内表面上的添加剂有效地抑制食用油或液体石蜡在容器内的浸透,能够使油膜稳定地维持较长一段时间。
作为此类渗出性添加剂,可使用有利地分散在热塑性树脂中并显示渗出性的渗出性添加剂。代表性实例为已用作所谓的润滑剂的化合物,即,如石蜡、聚乙烯蜡、液体石蜡和合成石蜡等烃系润滑剂;如硬脂醇、硬脂酸和12-羟基硬脂酸等脂肪族系润滑剂;如硬脂酰胺、油酰胺、芥酸酰胺、亚甲基双(硬脂酰胺)和亚乙基双(硬脂酰胺)等脂肪酸酰胺系润滑剂;如硬脂酸钙、硬脂酸锌、硬脂酸镁、硬脂酸铅、硬脂酸铝、硬脂酸钡、硬脂酸钡/锌复合体、和硬脂酸锌/硬脂酸钙复合体等金属皂系润滑剂;如固化油脂、单硬脂酸甘油酯、硬脂酸丁酯、季戊四醇四硬脂酸酯、硬脂酸硬脂酯、甘油脂肪酸酯、脱水山梨醇脂肪酸(C8~C22)酯、丙二醇脂肪酸(C8~C22)酯、蔗糖脂肪酸(C8~C22)酯和季戊四醇脂肪酸(C8~C18)酯等脂肪酸酯系表面活性剂;和如聚乙二醇和聚丙二醇等脂肪酸醚系表面活性剂(括号内的数值表示形成酯的脂肪酸的碳原子数)。
在本发明中,从高度抑制油膜的浸透的观点,将渗出性添加剂添加至形成容器内表面的热塑性树脂、并特别期望添加至形成容器内表面的烯烃系树脂。因此,脂肪酸酯特别优选用作渗出性添加剂。即,脂肪酸酯对特别是形成油膜的食用油或液体石蜡具有高亲和性,并示出高度保持油膜的效果。
上述渗出性添加剂通常以相对于100重量份的热塑性树脂为0.5至5.0重量份、特别是1.0至3.0重量份的量使用。如果其量少,则未充分展现期望的油膜保持效果。另一方面,即使过量使用渗出性添加剂,油膜保持效果也不会有任何进一步的改进,而会不利地影响内容物的品质、或者形成容器内表面的热塑性树脂显示劣化的性质。
上述容器可呈现各种形态,只要内表面通过使用上述热塑性树脂而形成即可。例如,其可以为具有层压在其内表面上的热塑性树脂层的纸容器的形态,或如PET等的聚酯层形成于其上的金属容器。然而,一般而言,容器优选为具有通过使用热塑性树脂形成的内表面的塑料容器,并且用于容纳粘稠内容物。
只要容器具有通过使用热塑性树脂形成的内壁,则容器的容器壁可以为热塑性树脂的单层结构或与任何其它热塑性树脂组合的多层结构。
例如,容器壁可以为包括如中间层、阻氧层或吸氧层的多层结构,从而改进阻氧性,因而有效避免因已透过的氧气所引起的容器中的内容物氧化和劣化。特别是,如果容器的内层和外层通过使用烯烃系树脂或聚酯树脂而形成,则期望采用多层结构。
阻氧层为包含阻氧性树脂的层,并且用于物理切断氧气的通过。作为阻氧性树脂,可代表的有23℃-0%RH下的透氧系数为10cc·20μm/m2/sec/atm以下的树脂,例如乙烯-乙烯醇共聚物或聚酰胺。特别是,乙烯-乙烯醇共聚物最为合适,因为其显示非常优异的阻氧性。
作为乙烯-乙烯醇共聚物(乙烯-乙酸乙烯酯共聚物的皂化产物),具体地,优选使用通过使乙烯含量为20至60mol%、特别是25至50mol%的乙烯-乙酸乙烯酯共聚物皂化以使其皂化度为96%以上、特别是99mol%以上而得到的共聚物皂化产物。乙烯-乙烯醇共聚物(下文中通常称作EVOH)必须具有形成膜用的足够大的分子量,通常具有如在苯酚/水的重量比为85/15的混合溶剂中在30℃下测量的0.01dl/g以上、特别是0.05dl/g以上的特性粘度(intrinsic viscosity)。
另外,在阻氧层中,阻氧性树脂可共混有烯烃系树脂,只要不损害阻氧性树脂的优异的阻氧性即可。特别是,EVOH对烯烃系树脂的粘合性差。然而,在与形成容器内表面的热塑性树脂如烯烃系树脂共混时,与形成容器内表面的热塑性树脂如烯烃系树脂的层的粘合性可得以改进。例如,如果以相对于100重量份EVOH为5至65重量份的量共混烯烃系树脂时,可以在不损害阻氧性并使得可以将阻氧层直接层压在形成容器内表面的烯烃系树脂层上的情况下改进粘合性。
吸氧性树脂层用于补充阻氧性,并且包括如JP-A-2002-240813中记载的氧化性聚合物和过渡金属系催化剂。通过过渡金属系催化剂的作用,氧化性聚合物用氧氧化;即,吸收氧并中断氧的透过。
氧化性聚合物和过渡金属系催化剂已详细记载于上述JP-A-2002-240813中。因此,尽管没有详细描述,氧化性聚合物的代表性实例为具有叔碳原子的烯烃系树脂(如,聚丙烯、聚丁烯-1或其共聚物)、热塑性聚酯和脂肪族聚酰胺;含亚二甲苯基的聚酰胺树脂;和含烯键式不饱和基的聚合物(如,源自如丁二烯等多烯的聚合物)。另外,作为过渡金属系催化剂,可列举如铁、钴和镍等过渡金属的无机盐,有机酸盐和配合物。
阻氧层和吸氧层以适当的厚度形成来发挥期望的氧切断性。
当阻氧层或吸氧层用作中间层时,期望经粘合性树脂层设置中间层,从而改进内外层的粘合性并防止分层。这使得可以将中间层与内外层牢牢地粘着固定。用于形成粘合性树脂层的粘合性树脂本身是已知的。例如,可使用主链或侧链中以1至100meq/100g树脂、特别是10至100meq/100g树脂的量含有羰基(>C=O)的树脂作为粘合性树脂。其具体实例为由如马来酸、衣康酸或富马酸等羧酸、或由其酸酐、其酰胺或其酯接枝改性的烯烃系树脂;乙烯-丙烯酸共聚物;离子交联烯烃系共聚物;和乙烯-乙酸乙烯酯共聚物。粘合性树脂层可具有保证适当程度的粘合力的厚度。
在本发明中,如果容器的内层通过使用烯烃系树脂来形成,则从利用烯烃系树脂的性质(如,快速排出粘稠内容物的挤出性(squeeze-out property))的观点,期望与内表面相对侧的外层通过使用与形成容器内表面的相同的烯烃系树脂来形成。另外,根据需要,还允许通过根据容器的用途使用能够形成膜的其它热塑性树脂来形成外层,例如通过使用如聚对苯二甲酸乙二醇酯(PET)、聚萘二甲酸乙二醇酯(PEN)、聚间苯二甲酸乙二醇酯、或其共聚物等聚酯树脂来形成外层。
另外,在上述多层结构中,可通过将在容器成形时产生的废料树脂混合至用于形成最外层的无填料树脂(virgin resin)中来形成重新研磨树脂层,作为多层中的任何一层。从使资源再利用的同时维持成形性的观点,在这种情况下,废料树脂的量相对于100重量份的外层形成用的无填料树脂(如,烯烃系树脂或聚酯树脂)为约10至约60重量份。
重新研磨树脂层的厚度根据容器的尺寸或内容物的种类而变化,且使得容器壁的总厚度不会变得不必要的大并且废料树脂可有效使用。
此外,用于本发明的容器可呈现各种形态,条件是如后所述可在容器内表面上形成油膜,并且粘稠内容物可排出而不受损。例如,容器可根据例如杯、瓶状、袋状(小袋(pouch))、注射器状、罐状、盘状和盒状等容器的材料而呈现形态,且可以拉伸成形。
容器根据其形态通过本身已知的方法成形。具体地,在塑料容器的情况中,包括上述层的层结构的预制件通过本身已知的方法成形,并通过热密封向其贴附膜,或者将其进行例如如柱塞辅助成形等真空成形、或吹塑成形等后加工,从而将预制件成形为容器。
图1为作为本发明中使用的容器的最优选实施方案的直接吹塑成形瓶的图。
在图1中,全体以10示出的瓶包括形成螺纹的颈部11、经肩部13连接至颈部11的体部壁15、和封闭体部壁15的下端的底壁17。在瓶10中形成后述的油膜,接着用粘稠内容物填充。
<油膜的形成>
在本发明中,在用粘稠内容物填充具有上述结构的容器之前,在容器的内表面形成油膜。在容器的内表面上形成油膜时,使得可以快速排出填充在容器中的粘稠内容物并完全不使内容物附着和残留在容器壁上。
即,在容器的内表面作为油膜的情况下,粘稠内容物以液-液接触的状态排出。即,粘稠内容物不与容器的内表面接触,不附着至容器的内表面,因而使得快速且完全地排出。
油膜通过使用食用油或液体石蜡(下文中,将它们称为油性液体)而形成。
油性液体为在大气压下具有小的蒸汽压的非挥发性液体并具有高到适当程度的粘度,不容易从容器内表面流下,与形成容器内表面的热塑性树脂、特别是烯烃系树脂或聚酯树脂的接触角小,倾向于形成均匀铺展在容器内表面上的膜,显示高度的对含有较多水分的粘稠内容物的排斥性,并显示高度的对粘稠内容物的滑移性。例如,其它物质会引起不便,诸如在大气压下挥发、从容器内表面流下、与内容物混合、不能形成膜,或即使它们已经形成了膜,也导致内容物的品质大幅降低。
在用于本发明的油性液体中,食用油的实例包括大豆油、菜籽油、橄榄油、米糠油、玉米油、红花油、芝麻油、棕榈油、蓖麻油、鳄梨油、椰子油、杏仁油、核桃油、榛子油、色拉油等。它们还可混合在一起使用。另外,根据食用油的种类,膜由于与内容物混合有时可能无法形成。在此情况下,可以使用在其它食用油或液体石蜡中选出的不与内容物混合的油性液体。
两种以上的油性液体可混合在一起以形成油膜。或者可适当地添加例如如脂肪酸酯或脂肪酸醚等界面润滑剂等添加剂,只要其不影响油膜表现出的诸如滑移性等性质即可。
另外,根据形成容器内表面的热塑性树脂的种类,可以使用在食用油或液体石蜡中选出的与内表面具有小接触角的例如与瓶内表面的接触角为38度以下、特别是25度以下的油性液体。
通过使用上述油性液体,根据容器的形态通过使用喷雾管的喷雾法或浸渍法等手段容易地形成油膜。
以通常5至60g/m2、特别地5至30g/m2的量使用油性液体来形成油膜。这是因为如果液体的量过少,则不能赋予充分程度的表面性质。另一方面,如果液体的量过多,则液体趋于脱落并因而液体的量大幅变化,使得难以稳定地维持性质。
<内容物的填充>
在本发明中,在如上所述形成食用油或液体石蜡的油膜后,快速填充粘稠内容物。
一般而言,在容器领域,容器制造商生产容器,已购买该容器的使用者填充内容物。然而,此处,如果容器制造商在容器内表面上形成油膜,之后如果使用者填充内容物,则自油膜形成至内容物填充可能经过了相当长的时间。结果,通常可能膜量已经减少,油膜的性质已经劣化,内容物不如所期望地稳定吐出,因而油膜的性质不会稳定地发挥。另一方面,根据本发明,使用者通过一系列的步骤形成油膜并容易填充粘稠内容物(通常在一分钟内)。因此,油膜通过粘稠内容物保持在容器内表面,并稳定地发挥油膜的性质。
粘稠内容物可借助本身已知的手段填充或者可在常温下填充。或者,一些种类的食物可热填充从而也达到灭菌的效果。
在填充内容物后,向容器安装盖以将其密封。之后,将容器销售给一般消费者。
例如,关于图1的瓶,通过热封向颈部11的上端开口部安装如铝箔等金属箔19,所定的盖20安装至其上,并将由此得到的包装容器(瓶)出售。在购买了包装瓶后,将盖20启封,剥离涂布有密封材料的金属箔19,将瓶10倾斜或倒立,必要时挤压体部壁15,从而取出粘稠内容物。瓶10具有可被挤压的体部壁15。因此,即使非常粘的糊状粘稠内容物也可容易地排出。
实施例
现将借助实施例描述本发明。
在实施例和比较例中,通过下述方法测量和评价各种性质。
<接触角的测量方法>
从用于实施例和比较例的涂油前的塑料瓶中切出3cm×3cm方形的平坦部分。用于形成油膜的油以10mg的量滴在平坦部分的面朝上的内表面,并通过使用接触角测定仪(DropMaster 700,由Kyowa Kaimen Kagaku Co.制)在23℃、50%RH下测量接触角。
<滑落性评价>
将根据实施例和比较例的填充有内容物的瓶在23℃下保存一周。推动保存一周的瓶的体部以通过瓶口部取出内容物直至最后一滴。之后,将空气导入瓶中以恢复其形状。
接下来,以倒立的状态(口部朝下)将瓶在冰箱中保存一天。之后,测量沿瓶的体部壁的内容物滑落程度(内容物还未附着在体部壁上的程度),并根据下式计算内容物滑落率,
内容物滑落率(%)=(内容物滑落的表面积/瓶体部壁的表面积)×100
从上述计算的内容物滑落率,以下述基准评价滑落性。
◎:内容物滑落率为90%以上。
○:内容物滑落率为70%以上且小于90%。
△:内容物滑落率为50%以上且小于70%。
×:内容物滑落率小于50%。
<吐出物外观评价>
将根据实施例和比较例的填充有内容物的瓶在23℃下保存一周。推动保存一周的瓶的体部,从而将内容物各自以15g的量吐出到玻璃板上。吐出的内容物呈现具有在内容物的外侧形成的透明的油膜的层状。测量在玻璃板上从内容物的外端至油膜端部的最大长度并以下述基准来评价。
◎:最大长度小于0.5mm。
○:最大长度为0.5mm以上且小于1.0mm。
△:最大长度为1.0mm以上且小于2.0mm。
×:最大长度为2.0mm以上。
下文描述在实施例和比较例中使用的形成油膜用的油性液体和渗出性添加剂。
油性液体;
食用油A:添加有中链脂肪酸的色拉油(粘度,50mPa·s(25℃))
食用油B:无中链脂肪酸的色拉油(粘度,80mPa·s(25℃))
液体石蜡C:粘度,5.0mm2/S(37℃)
液体石蜡D:粘度,36.0mm2/S(37℃)
渗出性添加剂;
润滑剂A:中链脂肪酸甘油三酯(脂肪酸酯系)
润滑剂B:油酰胺(脂肪酸酰胺系)
<实施例1>
通过使用4个挤出机成形4种5层的型坯。接着将多层型坯直接吹塑成形,从而得到具有图1所示的形状的以下4种5层塑料瓶(容积:400ml)。
外层(90μm)/粘合性树脂层(2.4μm)/阻气层(10μm)/粘合性树脂层(2.4μm)/内层(195.2μm)
各层的规格如下所述。
外层;低密度聚乙烯(LDPE)
MFR:0.3g/10min.(190℃,2.16Kg)
密度:0.922g/cm3
润滑剂(每LDPE为0.03重量%的油酰胺)
粘合性树脂层;酸酐改性的聚乙烯
阻气层;EVOH共聚物
密度:1.19g/cm3
Tg:61℃
内层;低密度聚乙烯(LDPE)
MFR:0.3g/10min.(190℃,2.16Kg)
密度:0.922g/cm3
食用油A用作油膜形成用的油性液体。将喷雾嘴插入塑料瓶至其底部并在喷射食用油A的同时向上拉,以使食用油A涂布在从瓶底起的整个侧壁表面,从而在其中形成油膜(涂油量15g/m2)。
食用油A与瓶内表面的接触角为18度。
将在内表面上形成了食用油A的油膜的塑料瓶由内容物填充,即,由400g的含有34%的脂质成分的蛋黄酱(25℃下的粘度为4000mPa·s)填充。瓶口部用铝箔热封并用盖密封,从而得到填充瓶。
评价瓶的滑落性和吐出物的外观。表1示出其结果以及油膜(食用油A)与瓶内表面的接触角。
<实施例2>
除了将油膜形成用的油性液体改成食用油B以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
<实施例3>
除了将油膜形成用的油性液体改成液体石蜡C以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
<实施例4>
除了将油膜形成用的油性液体改成液体石蜡D以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
<实施例5>
除了食用油的涂油量为5g/m2以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
<实施例6>
除了食用油的涂油量为30g/m2以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
<实施例7>
除了食用油的涂油量为60g/m2以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充得到填充瓶、并评价。表1示出评价结果。
<实施例8>
除了通过使用含有润滑剂A作为渗出性添加剂的LDPE(每LDPE的润滑剂含量为2.0重量%)形成瓶内层以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
<实施例9>
除了通过使用下述环状烯烃系树脂(COC)形成瓶内层以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
环状烯烃系树脂(COC);
乙烯-四环十二碳烯共聚物
MFR:30g/10min(260℃,2.16Kg)
密度:1.02g/cm3
Tg:80℃
<实施例10>
除了通过使用含有润滑剂A作为渗出性添加剂的COC(每COC的润滑剂含量为2.0重量%)形成瓶内层以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
<实施例11>
除了通过使用含有润滑剂B作为渗出性添加剂的LDPE(每LDPE的润滑剂含量为0.5重量%)形成瓶内层以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
<实施例12>
除了将填充在塑料瓶中的内容物改成含有14%的脂质成分的蛋黄酱(25℃下的粘度为2000mPa·s)以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
<实施例13>
除了将填充在塑料瓶中的内容物改成含有75%的脂质成分的蛋黄酱(25℃下的粘度为8000mPa·s)以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
<实施例14>
除了将填充在塑料瓶中的内容物改成含有0%的脂质成分的中浓酱(25℃下的粘度为800mPa·s)以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
<实施例15>
除了将填充在塑料瓶中的内容物改成含有0%的脂质成分的番茄酱(25℃下的粘度为2000mPa·s)以外,所有都以与实施例1相同的方式来生产塑料瓶、在其中形成油膜、通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
<比较例1>
除了不用油膜形成用的油性液体涂布塑料瓶的内表面,并且由此不形成油膜以外,以与实施例1相同的方式来生产塑料瓶并通过将瓶由内容物填充来得到填充瓶、并评价。表1示出评价结果。
附图标记说明
10:直接吹塑成形瓶
11:颈部
13:肩部
15:体部壁
17:底壁
Claims (4)
1.一种粘稠内容物的填充方法,其特征在于:
提供具有通过使用热塑性树脂形成的内表面的容器;
将食用油涂布在所述容器的内表面上以在其上形成油膜;和
用25℃下的粘度为100mPa·s以上的粘稠内容物填充内表面上形成有所述油膜的所述容器;
所述食用油与所述容器的内表面的接触角为25度以下,
其中,形成内表面的热塑性树脂为低密度聚乙烯LDPE,
油膜的量在5至60g/m2的范围内,
该容器使用乳化物作为粘稠内容物,
形成容器内表面的低密度聚乙烯LDPE共混有用作渗出性添加剂的脂肪酸酯。
2.根据权利要求1所述的填充方法,其中所述油膜的量在15至60g/m2的范围内。
3.根据权利要求1所述的填充方法,其中所述渗出性添加剂以相对于100重量份的所述低密度聚乙烯LDPE为0.5至5.0重量份的量来添加。
4.根据权利要求1所述的填充方法,其中所述容器具有包括通过使用所述低密度聚乙烯LDPE形成的内表面层的多层结构。
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