CN1090079C - 具有倒陷形状的树脂成形品的制造方法 - Google Patents
具有倒陷形状的树脂成形品的制造方法 Download PDFInfo
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- CN1090079C CN1090079C CN97126372A CN97126372A CN1090079C CN 1090079 C CN1090079 C CN 1090079C CN 97126372 A CN97126372 A CN 97126372A CN 97126372 A CN97126372 A CN 97126372A CN 1090079 C CN1090079 C CN 1090079C
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- parison
- blow molding
- resin
- shape
- forming product
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Images
Classifications
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Abstract
将热塑性树脂注塑成形,制成中间成形品型坯,然后,在吹塑成形为最终形状之前,将该型坯在敞开的金属模具内伸展,然后关闭该金属模具,吹塑成形为最终形状,从而可以以高的生产率制造具有均一板厚分布、格外高拉伸的具有倒陷形状的树脂成形品。
Description
本发明是关于采用注坯吹塑法制造具有倒陷形状(如图5所示,具有比开口部大的部分,妨碍从金属模具中取出成形品)的树脂成形制品的方法。
具有倒陷形状的树脂成形品可以用来作为照明灯罩类、各种容器类、产业用部件、与弱电有关的部件的壳体类等。
以往,具有倒陷形状的树脂成形品一般是采用下列方法制造:①注塑法、②压制法、③真空和压空法、④注坯吹塑法。
①注塑法,是在阳模与阴模之间设置与要制作的树脂成形品同样形状的空腔部,将熔融状态的合成树脂流入该空腔中,然后冷却、固化,将阳模和阴模分开,取出树脂成形品,但在树脂成形品的最外部尺寸比开口部大时,从树脂成形品上取下金属模具非常困难。
②压制法,是首先制造平板状的树脂中间成形品,在该树脂中间成形品还处于高温状态时,将该树脂中间成形品设置在阴模上,用阳模将该树脂成形品压入阴模内,形成所希望的形状,但用这种方法不可能得到最外部尺寸比开口部大的树脂成形品,而且,由于必须在树脂中间成形品还处于高温状态时进行操作,因此必须在连续的大型设备的生产线上进行。
③真空或压空成形法,是首先制造平板状的树脂中间成形品,将该树脂中间成形品设置在阴模上,把周围卡紧,然后加热卡紧的部分,从埋设在阴模上的排气孔抽出阴模与树脂中间成形品之间的空气,或者,向树脂中间成形品的内面喷射压缩空气,将该树脂中间成形品吹鼓,使之压接到阴模上,制成树脂成形品。
但是,采用这种方法时,伸出的形状有一定限制,另外需要使用预先制造的树脂板材,因此,不可能通过金属模具的结构制造开口处带有螺纹的制品,同时需要在后续加工中消除开品处残留的卡紧部。另外,成形周期延长,不适合于批量生产。
④注坯吹塑法,是利用注塑成形制造近似于树脂成形品形状的树脂中间成形品,在该树脂中间成形品还处于高温状态时,拆下阴模,将在阳模周围形成的树脂中间成形品与该阳模一起插入具有与要制造的树脂成形品相同形状的内部形状的阴模中,由贯通阴模埋设的孔喷射压缩空气,将树脂中间成形品吹鼓,使之压接到阴模上,制成树脂成形品。
这种方法可以连续地进行注塑成形和吹塑成形,由于树脂中间成形品的移动等操作而引起的灰尘等污染较少,生产率高,但在树脂成形品的最外部尺寸比开口部大时,虽然在某种程度上也可以成形,但可以制作的倒陷形状有一定限制。
用上述现有技术方法制造的具有倒陷形状的树脂成形品,其最外部尺寸比开口部大得越多,板厚的公差越容易扩大,特别是照明灯罩之类制品高度较浅、伴随有高拉伸的成形制品,拐角部的顶端或方形成形品的拐角部的壁厚变薄,强度不足,不耐实用,另外,照明用光漫射性灯罩类容易产生灯影象透射的问题。
因此,采用现有的成形方法可以制作的倒陷形状有一定限制。
鉴于上述情况,本发明人对于格外高拉伸的、具有倒陷形状的树脂成形制品,特别是可以保持更均匀的板厚分布而且生产率高的具有倒陷形状的树脂成形品的制造方法进行了潜心的研究,结果发现,采用注坯吹塑成形法制造具有倒陷形状的树脂成形品时,即将热塑性树脂注塑成形形成中间成形品的型坯,然后将该型坯吹塑成形为最终形状,制造具有倒陷形状的树脂成形品时,在将该型坯吹塑成形为最终形状之前,在开放的金属模具内预先伸展,然后关闭该金属模具,吹塑成形为最终形状,制成高拉伸的、具有倒陷形状的树脂成形制品,可以保持更均匀的板厚分布而且生产率高的具有倒陷形状的树脂成形品,从而完成了本发明。
本发明的目的是,提供高拉伸的、具有倒陷形状的树脂成形制品,特别是可以保持更均匀的板厚分布而且生产率高的具有倒陷形状的树脂成形品的制造方法。
即,本发明是具有倒限形状的树脂成形品的制造方法,其特征是,将热塑性树脂注塑成形,形成中间成形品的型坯,然后,在将该型坯吹塑成形为最终形状之前,在开放的金属模具内预先伸展后,关闭该金属模具,吹塑成形为最终形状。
附图的简要说明
下面参照附图说明本发明的方法。
图1-图6是表示在本发明的实施例中用于制造树脂成形品的金属模具及制造程序的示意图,图7-图8是表示比较例(以往的注坯吹塑法)中使用的金属模具和制造程序的示意图。
图1是表示本发明中采用注塑成形进行型坯成形的金属模具的纵剖面图。
图2是将型坯成形的金属模具敞开口的纵剖面图。
图3是表示吹塑成形中的金属模具配置的纵剖面图。
图4是表示吹塑成形前预伸展阶段的金属模具纵剖面图。
图5是表示吹塑成形的吹塑拉伸阶段的金属模具的纵剖面图。
图6是表示将吹塑成形的金属模具敞开品的纵剖面图。
图7是表示比较例中的采用注塑成形的型坯成形的金属模具的纵剖面图。
图8是表示吹塑成形的吹塑拉伸阶段的金属模具的纵剖面图。
本发明中使用的热塑性树脂可以举出:丙烯酸树脂、聚碳酸酯、聚苯乙烯、甲基丙烯酸甲酯与苯乙烯的共聚物-MS树脂、聚丙烯、聚乙烯、高密度聚乙烯、ABS树脂、聚砜树脂、热塑性聚酯树脂等可以注塑成形的树脂。
在丙烯酸树脂中,可以单独使用聚甲基丙烯酸甲酯,但为了改善加工性和热稳定性,往往使用含有少量其它单体例如丙烯酸甲酯、丙烯酸乙酯、丙烯酸丁酯、丙烯酸-2-乙基己酯等的共聚物。
在丙烯酸树脂中,含有重均分子量为8万-40万、用Z平均分子量规定的支化点间分子量为3万-50万的、具有支链结构的甲基丙烯酸甲酯类聚合物30-100%(重量)、直链甲基丙烯酸类树脂0-70%(重量)的甲基丙烯酸甲酯类树脂,成形性好且板厚公差比小(具有良好的均一性),换言之,在相同的板厚公差条件下可以制造倒陷比(图5中d1/d2)大的成形品,因而特别优先加以选用。
下面说明具有支链结构的甲基丙烯酸甲酯类聚合物。
具有这种支链结构的甲基丙烯酸甲酯类聚合物,在GB2294467中已有描述,它是以甲基丙烯酸甲酯为主要成分的单官能单体和能与之共聚的多官能单体的聚合物。
所述的以甲基丙烯酸甲酯为主要成分的单官能单体,是单独的甲基丙烯酸甲酯,或者甲基丙烯酸甲酯50%(重量)以上、最好是70%(重量)以上的、甲基丙烯酸甲酯与可共聚的单官能单体的混合物。
甲基丙烯酸甲酯不足50%(重量)时,不能充分发挥透明性和机械强度等甲基丙烯酸甲酯聚合物的特性。
可共聚的单官能不饱和单体例如可以举出:甲基丙烯酸乙酯、甲基丙烯酸丙酯、甲基丙烯酸丁酯、甲基丙烯酸苄酯等甲基丙烯酸酯类;丙烯酸甲酯、丙烯酸乙酯、丙烯酸丙酯、丙烯酸丁酯、丙烯酸-2-乙基己酯等丙烯酸酯类;丙烯酸、甲基丙烯酸、马来酸、衣康酸等不饱和羧酸、马来酸酐、衣康酸酐等酸酐;丙烯酸-2-羟乙酯、丙烯酸-2-羟丙酯、丙烯酸一甘油酯、甲基丙烯酸-2-羟乙酯、甲基丙烯酸羟丙酯、甲基丙烯酸一甘油酯等含有羟基的酯;丙烯酰胺、甲基丙烯酰胺、双丙酮丙烯酰胺等酰胺类;丙烯腈、甲基丙烯腈等腈类、甲基丙烯酸二甲氨基乙酯等含氮的单体;烯丙基一缩水甘油醚、丙烯酸缩水甘油醚、甲基丙烯酸缩水甘油醚等含有环氧基的单体;苯乙烯、α-甲基苯乙烯等苯乙烯类单体。
可以共聚的多官能单体可以举出:将乙二醇二(甲基)丙烯酸酯、二乙二醇二(甲基)丙烯酸酯、三乙二醇二(甲基)丙烯酸酯、四乙二醇二(甲基)丙烯酸酯等乙二醇或其低聚物的两末端羟基用丙烯酸或甲基丙烯酸酯化的产物;将新戊二醇二(甲基)丙烯酸酯、己二醇二(甲基)丙烯酸酯、丁二醇二(甲基)丙烯酸酯等二元醇的羟基用丙烯酸或甲基丙烯酸酯化的产物;将三羟甲基丙烷、季戊四醇等多元醇或其多元醇衍生物用丙烯酸或甲基丙烯酸酯化的产物;二乙烯基苯等具有2个以上链烯基的芳基化合物等。
具有该支链结构的甲基丙烯酸类聚合物的重均分子量(Mw)是8万-40万,优选的是15万-30万,用Z平均分子量(Mz)规定的支化点间分子量(Mzb)是3万-50万,优选的是5万-20万。
Mw不到8万时,该树脂的机械强度和耐溶剂性不足,反之,超过40万时,熔融流动性降低,成形性低下,因而不可取。
另外,支化点间分子量(Mzb)超过50万时,所得树脂的熔融拉伸时的张力差,由其构成的组合物的成形性不好,反之,低于3万时,机械强度差,成形品的外观也不好。
这里所说的Mw、Mz是用凝胶渗透色谱法(GPC)和示差折射计测定的数值。
测定方法例如在1984年度版“高分子特性解析”(共立出版)24页-55页有记载。
所述的支化点间分子量是指在具有支链结构的聚合物中从一个支化点到下一个支化点的分子量平均值。
用Mz值规定支化点间分子量。
用该Z平均分子量规定的支化点间分子量(Mzb)在日本ゴム协会志、第45卷、第2号、105-118页“キャラクタリゼ-ション”和PolymerJoumal vol.3,No.6,page729-738(1972)中有记载,可以按下列公式(1)和(2)计算。
[(η1)/(η2)]10/6=[(1+Bz/6)0.5+4Bz/3π]-0.5....(1)
Mzb=Mz/Bz.....(2)
在上述公式(1)中,η1表示相对于直链甲基丙烯酸甲酯聚合物标准试样的GBC溶出时间的特性粘度和绝对分子量的积的关系,是在用普遍较正曲线得到的相对于测定对象的聚合物的绝对分子量的特性粘度的关系的较正曲线中、分子量对应于Mz值的特性粘度。
η2是在表示在相对于直链甲基丙烯酸甲酯聚合物标准试样的绝对分子量的特性粘度的关系的曲线中,相对于与测定对象聚合物相同的分子量Mz值的特性粘度。
Bz是Z平均分子量Mz中的支化点的数目。
作为具有该支链结构的甲基丙烯酸甲酯,聚合物中分子量30万以上的比例,该聚合物在氯仿中、25℃下的比浓粘度为0.7dl/g以下时,是{[14×(比浓粘度值)-6.8]~[14×(比浓粘度值)+11.2]}(重量%),在比浓粘度为0.7dl/g以上时,是{[40×(比浓粘度值)-25]~[40×(比浓粘度值)-7]}(重量%)。
本发明中所述的比浓粘度是测定的聚合物的溶液浓度为1g/dl的值。
具有支链结构的甲基丙烯酸甲酯类聚合物的分子量30万以上的比例在上述范围内时,甲基丙烯酸甲酯类聚合物的流动性和熔融时的拉伸强度具有良好的平衡,因而,用它制得的树脂组合物也具有良好的流动性与熔融拉伸时的强度的平衡,可以得到良好的成形体。
另外,具有支链结构的甲基丙烯酸甲酯类聚合物的交联度,用凝胶百分率(丙酮不需要部分相对于聚合物总重量的重量%)表示,通常是3%以下,优选的是1%以下,最好是大约0%。
具有支链结构的甲基丙烯酸甲酯类聚合物,可以通过形成含有上述单官能单体、多官能单体的多官能性构成单元的成分、必要时添加链转移剂和/或聚合引发剂进行聚合而得到。
形成多官能性的构成单元的成分,可以举出上述多官能单体、多官能链转移剂、多官能引发剂以及它们的2种以上的混合物。
相对于单官能单体来说,形成多官能性的构成单元的成分的量一般是0.02-1%(重量)。
链转移剂可以采用甲基丙烯酸甲酯聚合用的公知的链转移剂。其中,有具有1个链转移官能基的单官能链转移剂和具有2个以上链转移官能基的多官能链转移剂。
单官能链转移剂可以举出烷基硫醇类、硫基乙醇酸酯类等,多官能链转移剂可以举出,将乙二醇、新戊二醇、三羟甲基丙烷、季戊四醇、二季戊四醇、三季戊四醇、山梨糖醇等多元醇羟基用硫基乙酸或3-巯基丙酸酯化的产物。
具有支链结构的甲基丙烯酸甲酯类聚合物聚合使用的链转移剂的量,每1摩尔单官能单体,通常是5×10-5摩尔-5×10-3摩尔,可共聚的多官能单体的量,每1摩尔单官能单体通常是官能基数为1×10-5~{该链转移剂(摩尔)-2.5×10-4}当量的范围。
具有支链结构的甲基丙烯酸甲酯类聚合物的重均分子量,取决于主要使用的多官能单体的浓度、链转移剂的浓度以及自由基引发剂的浓度。
重均分子量的调整,多官能单体浓度越高,重均分子量越大,反之,链转移剂浓度越高重均分子量越小,可以在多官能单体的上述浓度范围内和链转移剂的浓度范围内适当加以改变。
支化点间分子量主要通过多官能单体浓度加以调整。多官能单体浓度越高,支化点间分子量越小。
另外,就链转移剂而言,多官能链转移剂的浓度越高,支化点间分子量越小。
多官能单体的浓度越高,分子量30万以上的比例越大。
聚合引发剂有每1个分子中产生1对自由基的单官能聚合引发剂和每1个分子中产生2对以上自由基的多官能聚合引发剂。
单官能聚合引发剂例如可以举出:2,2’-偶氮二(2,4-二甲基戊腈)、偶氮二异丁腈、二甲基-2,2’-偶氮二异丁醇酯等偶氮化合物;叔丁基过氧化新戊酸酯、叔丁基过氧化-2-乙基己酸酯、枯基过氧化-2-乙基己酸酯等过氧化酯类;二-3,5,5-三甲基过氧化己酰、过氧化二月桂酰等二酰基过氧化物类有机过氧化物等。
多官能聚合引发剂例如可以举出:2官能的1,1-双(叔丁基过氧化)3,3,5-三甲基环己烷、二-叔丁基过氧化三甲基己二酸酯、3官能的三(叔丁基过氧化)三嗪、4官能的2,2-双(4,4-二-叔丁基过氧化环己基)丙烷等。
象本体聚合那样以45-60%(重量)聚合率结束聚合的场合,使用3官能以上的多官能聚合引发剂时,与单独采用多官能单体的支链相比,可以减少由多官能单体而引起的未反应乙烯基的数量。
使用多官能聚合引发剂时,可以调换成上述多官能构成单元的一部分或全部。
聚合引发剂的用量,根据聚合方法采用公知的适宜的量,相对于100份(重量)单体或单体混合物,通常是0.001-1份(重量),优选的是0.01-0.7份(重量)。聚合引发剂的量越多,重均分子量越小,这一点与一般的甲基丙烯酸甲酯类聚合物是一样的。
本发明中的直链甲基丙烯酸类树脂,是惯用的甲基丙烯酸类树脂,是以甲基丙烯酸甲酯为主要成分的单官能单体的聚合物。
所述的以甲基丙烯酸甲酯为主要成分的单官能单体,是单独的甲基丙烯酸甲酯,或者甲基丙烯酸甲酯50%(重量)以上、最好是70%(重量)以上的、甲基丙烯酸甲酯与可共聚的单官能单体的混合物。
可以与甲基丙烯酸甲酯共聚的单官能单体,具体地说与上面所述相同。
直链甲基丙烯酸类树脂的重均分子量Mw是7-20万,优选的是8-18万。
重均分子量Mw低于7万时,由所得到的树脂组合物制得的成形体的机械强度不足,超过20万时,熔融流动性降低,加工性能恶化。
获得具有支链结构的甲基丙烯酸甲酯类聚合物和直链的甲基丙烯酸类树脂的聚合方法,可以采用一般的制造甲基丙烯酸甲酯类聚合物的公知的聚合方法,即悬浮聚合法、本体聚合法、乳化聚合法。
甲基丙烯酸甲酯类树脂中的比例为,具有支链结构的甲基丙烯酸甲酯类聚合物30-100%(重量),直链甲基丙烯酸类树脂0-70%(重量)。
在甲基丙烯酸甲酯类树脂中,可以根据需要含有一般的丙烯酸树脂中可以添加的各种添加剂,例如脱模剂、紫外线吸收剂、着色剂、防氧化剂、热稳定剂、增塑剂等。
本发明中使用的成形机,是由并用一般的注塑单元、型坯金属模具和吹塑金属模具的合模装置构成的注坯吹塑成形机。
下面说明成形方法。
在本发明中,首先将阴模1和阳模2闭合,由热流道4将熔融树脂注射到由阴模1、阳模2和瓶颈模3构成的封闭的空腔中,成形为树脂中间成形品型坯5(图1)。
然后,打开阴模1和阳模2(图2),使保持有型坯5的瓶颈模3在吹塑模6和模塞7之间移动,或者使吹塑模6和模塞7在固定的瓶颈模3的上面和下面移动(图3),在打开吹塑模6的状态下,将夹紧型坯5的瓶颈模3和模塞7关闭。
然后,将设置在模塞7中的塞8伸出,使型坯伸展,直到伸展的深度(高度)达到开口尺寸的0.5-1.5倍(图4)。
随后,使模塞7恢复原状,关闭吹塑模6,同时由空气注入口9向吹塑模内吹入空气,通过吹塑模6给树脂赋形(图5)。冷却后,打开吹塑模6和瓶颈模3,取出树脂成形品10(图6)。
以往的注坯吹塑法,是由热流道4’将熔融树脂注射到由阴模1’和阳模2’构成的封闭空腔内,成形为树脂中间成形品型坯5’(图7,该图中是半球状),然后将保持型坯5’的阳模2’移动到吹塑模6’中,关闭阳模2’和吹塑模6’,同时向吹塑模内部吹入空气,通过吹塑模6’给树脂赋形(图8),冷却后打开阳模2’和吹塑模,取出树脂成形品10’。
在由于制品的壁厚和形状的原因,与型坯的注塑成形相比,吹塑成形工序需要较多的时间,生产效率差的场合,也可以分成型坯成形和包含有预伸展的吹塑成形的工序。
即,采用一般的注塑成形预先批量生产型坯,然后在另外的工序中将型坯夹紧到瓶颈模上,再次加热,用本发明的方法进行吹塑成形。
采用这种方法,不仅提高了成形的批量生产性,而且可以显著降低成形机械的设备费用和吹塑成形部的金属模具(倒陷用)的成本。
将热塑性树脂注塑成形制造树脂中间成形品型坯时,注塑成形温度一般是170-300℃,对于通用的丙烯酸树脂,一般采用190-260℃可以得到良好的型坯。
吹塑成形前型坯的伸展,一直进行到伸展深度(高度)达到开口尺寸的0.5-1.5倍为止。
因此,伸展时的金属模具开放应考虑到该高度适当加以确定。
上述伸展可以采用将模塞伸出进行的模塞法、注入压缩空气进行的吹塑法、或者两种方法并用。
预伸展时金属模具的温度以及形成最终成形品的吹塑成形的条件,根据树脂的种类、成形品的形状等适当设定。
本发明的方法,对于制造成形面积展开率超过100%的深拉延成形品、倒陷比为1.0-2.0、最外尺寸比为1.2-2.0的成形品特别有效。
所述的成形面积展开率由下面的公式(3)表示。
[成形面积展开率(%)]=[(型坯平均壁厚/成形后的成形品平均壁厚)-1]×100……(3)
所述的倒陷比由下面的公式(4)表示:
[倒陷比]=[倒陷部的长度(d1)/倒陷部的最大高度(d2)]……(4)
所述的最外尺寸比由下面的公式(5)表示:
[最外尺寸比]=[最外尺寸(d3)/开口尺寸(d4)]……(5)式中,d1、d2、d3、d4的长度如图5中所示。
在以往的具有倒陷形状的树脂成形品的制造过程中,对于预先形成一体的吹塑模将型坯压空或吹塑拉伸时,与金属模具内表面接触的部分冷却,板或型坯的伸展被阻止,因此,延迟赋形的伸出部(最外周部)处壁厚极薄,或者不能伸展到最外尺寸,得不到所希望的倒陷形状。
以往,在注坯吹塑成形法中,壁厚的均一化是通过调整型坯的形状来进行的,但对于高度浅、倒陷大的形状来说,壁厚的均一化不充分。而采用本发明时,通过将金属模具打开,使型坯预伸展,可以防止突出部赋形前与吹塑模内表面接触,使成形品的壁厚更均匀。
采用连续地进行上述注塑成形、预伸展、吹塑成形的方法,没有来自外部的污染,可以以高的生产率制造树脂成形品。
另外,如上所述,根据制品的形状,通过在另外的工序中进行中间成形体型坯的注塑成形和伸展以及吹塑成形,还可以进一步提高生产率,降低产品的成本。
采用本发明的方法制造倒陷大的树脂成形品时,与以往的方法相比,板厚分布特别均匀,外观、强度显著得到改善,没有来自外部的污染,并且生产率高。
将用本发明方法制造的树脂成形品用来作为照明灯罩时,周边部分的均一性良好,不会发生照明灯的透射,可以制成具有均一亮度分布的良好照明灯罩。
实施例
下面通过实施例具体地说明本发明。
采用下述方法进行评价。
(1)板厚公差:
测定除了成形品的开口部(成形品的瓶颈部分)的区域的板厚分布。
(2)公差比:
用板厚公差的最大值与最小值之比(最大值/最小值)表示。
该值越大,说明成形品壁厚的均一性越差,该值超过3时评定为均一性不良。
(3)成形品的倒陷比:
用成形品倒陷部的长度与高度之比(d1/d2)表示。
该值比金属模具的倒陷比小得越多,判定为倒陷部不能赋形(延伸)。
(4)外观:
目视观察调色为白色(乳白色)的成形品,按以下标准进行评价。
◎:良好
○:部分不均匀,大致良好
×:拐角部的颜色浅,透光显著,不良。
实施例1
图1-图6表示用于制造树脂成形品的金属模具和制造程序。
使用具有由阳模2、瓶颈模3、阴模1构成的具有热流道4的型坯金属模具,将加热至230-250℃熔融的直链甲基丙烯酸类树脂(参照BP2294467的比较例3、用89.5份(重量)甲基丙烯酸甲酯和10.5份(重量)丙烯酸甲酯制成的树脂、MFR:10.5(g/10min))注塑成形,得到直径φ255mm、平均壁厚2.5mm的圆盘状的树脂中间成形制品型坯5(图1)。型坯金属模具温度调至120-140℃。
然后,打开阳模2和阴模1(图2),在瓶颈模3的上下滑动模塞7和吹塑模6(图3),在敞开吹塑模6的状态下关闭模塞7,利用调温至80-140℃的模塞8使型坯5伸展(图4)。
然后,一面引入模塞,一面关闭调温至60-80℃的吹塑模6,在8-9kgf/cm2的压力下向吹塑模内注入20-40℃的空气,形成最终的成形品形状(开口尺寸250mm、最外尺寸φ350mm、平均壁厚1.0mm、倒陷比1.25)(图5)。
冷却后,将吹塑模6和瓶颈模3分型,得到树脂成形品10(图6)。
型坯形状、金属模具形状和预伸展时的型坯温度示于表1中,所得树脂成形品的成形性、成形品形状和外观示于表2中。
如表2所示,所得树脂成形品的板厚分布均匀,具有与吹塑模一致的倒陷形状和良好的外观。
实施例2
除了型坯模具的直径φ525mm、成形品的开口尺寸520mm、成形品的最外尺寸650mm、倒陷比增大之外,按照与实施例1相同的条件制造树脂成形品。
如表2所示,所得树脂成形品的板厚分布均匀,具有与吹塑模一致的倒陷形状和良好的外观。
实施例3
使用参照GB2294467的实施例2、用89.5份(重量)甲基丙烯酸甲酯和10.5份(重量)丙烯酸甲酯制成的重均分子量16万、用Z平均分子量规定的支化点间分子量为13万的具有支链结构的甲基丙烯酸甲酯聚合物,除此之外按照与实施例2同样的条件制造树脂成形品。
如表2所示,所得树脂成形品的板厚分布均匀,具有与吹塑模一致的倒陷形状和良好的外观。
实施例4
使用聚碳酸酯树脂(住友ダゥ株式会社制カリバ-2061-22Mォパ-ル色),注塑成形温度250-320℃,型坯金属模具温度150-190℃,吹塑金属模具温度80-120℃,模塞金属模具温度80-160℃,除此之外按照与实施例2同样的条件成形。
如表2所示,所得树脂成形品的板厚分布均一,具有与吹塑金属模具一致的倒线形状,并且外观良好。
比较例1
图7-图8示出制造比较例的树脂成形品使用的金属模具和制造程序。
用注塑成形形成半球状的型坯(平均壁厚3.5mm)(图7),然后敞开阳模2’和阴模1’,使吹塑模6’滑动到阳模2’的下面,不进行预伸展,不打开吹塑金属模具,除此之外与实施例1同样进行吹塑成形(图8),得到树脂成形品。
如表2所示,所得树脂成形品虽然可以进行成形操作,但成形品的中央部位与壁厚较薄的周边部位颜色明显不均匀,外观差。
比较例2
用注塑成形形成半球状的型坯(平均壁厚3.5mm)(图7),然后敞开阳模2’和阴模1’,使吹塑模6’滑动到阳模2’的下面,不进行预伸展,不打开吹塑金属模具,除此之外与实施例2同样进行吹塑成形(图8),得到树脂成形品。
如表2所示,所得树脂成形品虽然可以进行成形操作,但成形品的周边部位的壁厚明显变薄,部分出现破损。
比较例3
除了使用与实施例3中同样的树脂外,与比较例2同样成形,得到树脂成形品。
如表2所示,所得树脂成形品虽然可以进行成形操作,但成形品的中央部位与壁厚较薄的周边部位颜色明显不均匀,外观差。
比较例4
除了使用与实施例4中同样的树脂外,与比较例2同样成形,得到树脂成形品。
如表2所示,所得树脂成形品虽然可以进行成形操作,但成形品的中央部位与壁厚较薄的周边部位颜色明显不均匀,外观差。
表1
树脂材料 | 型坯的形状 | 型坯成形品平均壁厚(mm) | 金属模具形状 | 伸展时的型坯温度(℃) | ||||
倒陷比 | 成形展开率(%) | 最外尺寸比 | ||||||
实施例 | 1 | PMMA | D-状 | 2.5 | 1.25 | 170 | 1.40 | 170 |
2 | PMMA | D-状 | 2.5 | 1.63 | 195 | 1.25 | 170 | |
3 | PMMA* | D-状 | 2.5 | 1.63 | 195 | 1.25 | 170 | |
4 | PC | D-状 | 2.5 | 1.63 | 195 | 1.25 | 190 | |
比较例 | 1 | PMMA | 半球状 | 3.5 | 1.25 | 170 | 1.40 | 170 |
2 | PMMA | 半球状 | 3.5 | 1.63 | 195 | 1.25 | 170 | |
3 | PMMA* | 半球状 | 3.5 | 1.63 | 195 | 1.25 | 170 | |
4 | PC | 半球状 | 3.5 | 1.63 | 195 | 1.25 | 190 |
PMMA*:具有支链结构的PMMA
D-状:圆盘状
表2
吹塑成形性 | 成形品形状 | 外观 | |||||
板厚公差 | 倒陷比 | ||||||
最小值(mm) | 最大值(mm) | 公差比 | |||||
实施例 | 1 | ○ | 0.8 | 1.0 | 1.25 | 1.25 | ◎ |
2 | ○ | 0.6 | 1.2 | 2.00 | 1.63 | ◎ | |
3 | ◎ | 0.8 | 1.1 | 1.38 | 1.63 | ◎ | |
4 | ○ | 0.7 | 1.1 | 1.57 | 1.63 | ◎ | |
比较例 | 1 | △ | 0.5 | 2.0 | 4.00 | 1.14 | × |
2 | ×* | 0.3 | 2.2 | 7.30 | 1.22 | × | |
3 | △~○ | 0.6 | 1.9 | 3.17 | 1.41 | △ | |
4 | △ | 0.3 | 2.1 | 7.00 | 1.45 | × |
×*:一部分有破绽
Claims (4)
1.具有倒陷形状的树脂成形品的制造方法,其中树脂成形品的倒陷比是1.0-2.0,最外尺寸是开口尺寸的1.2-2.0倍,公差比不大于3,包括将含有重均分子量为8-40万、用Z平均分子量规定的支化点间分子量为3-50万的、具有支链结构的甲基丙烯酸甲酯类聚合物30%(重量)以上的甲基丙烯酸甲酯类树脂注塑成形,制成中间成形品型坯,在吹塑成形为最终形状之前,将该型坯在敞开的金属模具内预伸展,然后关闭该金属模具,吹塑成形为最终形状。
2.权利要求1所述的制造方法,其特征是,采用模塞法、吹塑法或同时并用这两种方法进行预伸展。
3.权利要求1所述的制造方法,其特征是,预伸展的深度是开口尺寸的0.5-1.5倍。
4.权利要求1所述的制造方法,其特征是,所述树脂成形品是照明用灯罩。
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US (1) | US6045746A (zh) |
EP (1) | EP0842753B1 (zh) |
KR (1) | KR19980042502A (zh) |
CN (1) | CN1090079C (zh) |
AU (1) | AU726562B2 (zh) |
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DE19706797A1 (de) * | 1997-02-20 | 1998-08-27 | Kourtoglou Sa | Verfahren zur Herstellung von Verpackungsbehältern aus Kunststoff sowie Formstation für einen Kunststoff-Verpackungsbehälter, Verpackungsmaschine und Kunststoff-Verpackungsbehälter, insbesondere hergestellt nach dem vorgenannten Verfahren, sowie Verfahren zur Herstellung befüllter und verschlossener Verpackungsbehälter |
FR2795360B1 (fr) * | 1999-06-24 | 2001-12-14 | Technologique De Prec Mecaniqu | Procede de fabrication d'articles de conditionnement et machine de fabrication correspondante |
JP2002365771A (ja) * | 2001-06-11 | 2002-12-18 | Fuji Photo Film Co Ltd | レンズ付きフイルムユニット |
KR100953625B1 (ko) * | 2002-12-23 | 2010-04-20 | 주식회사 포스코 | 후판 가변형 디스케일링 장치 |
ITMO20060036A1 (it) * | 2006-02-02 | 2007-08-03 | Green Pack S R L | Apparati e metodi per termoformare contenitori |
EP2621821B8 (en) | 2010-10-01 | 2017-05-03 | Friendship Products LLC | Modular interlocking containers with enhanced lateral connectivity features |
US9290300B2 (en) | 2012-02-21 | 2016-03-22 | Friendship Products Llc | Modular interlocking containers |
CN103296420A (zh) * | 2012-03-02 | 2013-09-11 | 深圳光启创新技术有限公司 | 超材料天线罩的制造方法 |
KR101435855B1 (ko) * | 2012-07-09 | 2014-08-29 | 엘지전자 주식회사 | 조명장치용 광학커버의 제조방법 |
USD806553S1 (en) | 2012-08-09 | 2018-01-02 | Friendship Products, Llc | Container |
USD794466S1 (en) | 2012-08-09 | 2017-08-15 | Friendship Products, Llc | Container |
USD794467S1 (en) | 2012-08-09 | 2017-08-15 | Friendship Products, Llc | Container |
WO2015012894A2 (en) * | 2013-03-15 | 2015-01-29 | Friendship Products Llc | Molding system and method for manufacturing modular interlocking articles |
CN110269736B (zh) * | 2015-07-05 | 2022-02-11 | 大庆元子科技开发有限公司 | 一种防体液交叉安全套嵌套成型生产方法及工具 |
CN110234492B (zh) * | 2017-01-06 | 2022-07-08 | 福林德施普产品有限公司 | 模制系统和相关方法 |
CN112026141A (zh) * | 2020-07-01 | 2020-12-04 | 中山市天程新型材料制品有限公司 | 一种吹塑灯罩中心点精准定位的方法 |
NL2032680B1 (en) * | 2022-08-04 | 2024-02-09 | Eme Engel Machf En Engineering B V | Device for manufacturing detergent pods |
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- 1997-11-17 KR KR1019970060501A patent/KR19980042502A/ko active IP Right Grant
- 1997-11-17 AU AU45219/97A patent/AU726562B2/en not_active Ceased
- 1997-11-17 TW TW086117140A patent/TW346438B/zh active
- 1997-11-18 EP EP97309270A patent/EP0842753B1/en not_active Expired - Lifetime
- 1997-11-18 DE DE69716555T patent/DE69716555T2/de not_active Expired - Fee Related
- 1997-11-18 CN CN97126372A patent/CN1090079C/zh not_active Expired - Fee Related
- 1997-11-18 US US08/972,571 patent/US6045746A/en not_active Expired - Fee Related
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AU726562B2 (en) | 2000-11-09 |
DE69716555T2 (de) | 2003-07-03 |
US6045746A (en) | 2000-04-04 |
AU4521997A (en) | 1998-06-04 |
CN1192401A (zh) | 1998-09-09 |
DE69716555D1 (de) | 2002-11-28 |
EP0842753B1 (en) | 2002-10-23 |
TW346438B (en) | 1998-12-01 |
KR19980042502A (ko) | 1998-08-17 |
EP0842753A1 (en) | 1998-05-20 |
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