CN115383983A - 注射成型模具、注射拉伸吹塑成型机、和中空成型体的制造方法 - Google Patents
注射成型模具、注射拉伸吹塑成型机、和中空成型体的制造方法 Download PDFInfo
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Abstract
本发明涉及注射成型模具、注射拉伸吹塑成型机、以及中空成型体的制造方法。有效利用了使注射型芯模的外表面粗糙的优点,当使用使底部成为薄壁进行成型的预塑坯制造中空成型体时,不会在中空成型体的底部产生粗糙加工面的转印痕迹,从而获得底部美观整齐的中空成型体。注射型芯模(12)的前端部的外表面与预塑坯底部(10)和预塑坯主体部(14)的下端(14a)对应,使与该预塑坯底部(10)和预塑坯主体部(14)的下端(14a)对应的面成为镜面加工面(20),使镜面加工面以外的预塑坯对应面成为粗糙加工面(15)。
Description
技术领域
本发明涉及一种用于成型预塑坯的注射成型模具、具备该注射成型模具并由预塑坯来制造中空成型体的注射拉伸吹塑成型机、以及中空成型体的制造方法。
背景技术
专利文献1举出如下问题:由于预塑坯锥度小且细长,因此难以将对预塑坯进行成型的注射成型模具中的注射型芯模拔出。并示出如下情况:作为对策,为了使拔出容易而将注射型芯模的外表面研磨加工成镜面,即使这样也还存在如下问题:空气也无法散逸,封入的空气积存而产生痕迹。
而且,专利文献1也举出:在注射型芯模的外表面通过蚀刻加工形成皮纹、梨皮纹花纹等细小的凹凸。也示出了:使用该技术对注射型芯模的外表面进行皱纹加工、喷丸加工,使表面粗糙化并在注射的树脂与型芯模之间形成空气层,以使得空气向型芯前端侧流动。并说明了:在喷丸的情况下,当向表面喷射细小的投射材料颗粒使表面粗糙化而在表面做成微细的凹凸时,溶融树脂不会转印该凹凸的图案,能够形成空气层,该空气层提高了从模具脱出的适应性。
而且,该专利文献1也示出了如下技术:使预塑坯口部的前端附近的与预塑坯内表面对应的部位的表面、和与凸缘、联接器等突起对置的相对于预塑坯内表面的表面成为镜面加工面,并使除此以外的表面成为皱纹加工面,并示出了如下措施:在镜面部分使型芯模与预塑坯紧密贴合并冷却预塑坯的树脂,以避免产生收缩气孔。
另外,专利文献2示出了:作为容易从注射成型的预塑坯中拔出注射型芯模的措施,在注射型芯模的主体部规定部的表面形成从所述主体部规定部向颈部规定部延伸的槽,使注射型芯模的主体部规定部的表面中的、形成有槽的部分的周向的中心线平均粗糙度为0.2μm以上且15μm以下。
另外,专利文献3也示出了:作为容易从注射成型的预塑坯中拔出注射型芯模的措施,在比注射型芯模的口部成型部靠向下侧的表面层形成多个细小的凹陷,并示出了:在预塑坯成型时容许在该凹陷中滞留空气,使空气层断续地滞留于柔软的预塑坯与注射型芯模之间,并且使该柔软的预塑坯的内表面与注射型芯模的外表面的接触因注射型芯模的凹陷而成为局部性接触,减小了拔出注射型芯模时的摩擦阻力。
专利文献4并未示出改善从预塑坯的拔出的技术,该专利文献4示出了:在注射型芯模前端的半球面形成纹理图案,该纹理图案由粗糙面形成,且所述粗糙面由微细的凹凸形成。专利文献4发明本身目的是在瓶开封时有效地产生气泡,示出了从注射型芯模向注射成型的预塑坯的预塑坯底部转印图案的技术。
现有技术文献
专利文献
专利文献1:日本专利第6326790号公报
专利文献2:日本专利第6780155号公报
专利文献3:日本专利公开平成04-085007号公报
专利文献4:日本专利公开2017-088209号公报
发明内容
(一)要解决的技术问题
以热型坯形式来成型PET瓶等中空成型体的成型机具备:注射成型部,其从注射装置射出熔融树脂来注射成型预塑坯;吹塑成型部,其对从注射成型部移动送来的高温状态的预塑坯进行拉伸,并且吹入气体来吹塑成型中空成型体;以及取出部,其将中空成型体送出到成型机外。
注射成型部、吹塑成型部、取出部沿着旋转板的旋转方向依次定位设置。旋转板以规定角度旋转,从而使唇模以位置依次与注射成型部、吹塑成型部、取出部对应的方式旋转,在注射成型部中,以组合了该注射成型部所具备的注射成型模具的注射型芯模、注射型腔模、以及唇模的状态,注射熔融树脂来注射成型预塑坯。
注射成型的预塑坯通过唇模向吹塑成型部输送,在组合式的吹塑成型模具上组合有唇模,并在模具内配置有预塑坯。在吹塑成型部中,利用拉伸杆以按压预塑坯底部的方式沿高度方向进行拉伸,并且吹入气体而从预塑坯吹塑成型中空成型体。
而且,被吹塑成型的中空成型体被利用旋转板的旋转进行移动的唇模向取出部输送。在取出部中,唇模释放中空成型体的口部,从而能够将中空成型体送出到成型机外。
释放了中空成型体的唇模利用旋转板的所述旋转向注射成型部移动,在该注射成型部中,能够如上述那样将唇模组装于注射成型模具,并进行预塑坯的注射成型。
在注射拉伸吹塑成型机中,通过缩短预塑坯的成型周期,来提高中空成型体的生产效率。因此,能够如上述那样使注射型芯模的外表面变得粗糙而提高脱模性,并缩短预塑坯的成型周期。
另外,通过提前使预塑坯从注射成型模具脱模的时机,来缩短预塑坯的成型周期,并提早向吹塑成型模具移动来进行吹塑成型,从而能够提高中空成型体的生产效率。
在将使预塑坯脱模的时机提前,并利用吹塑成型模具对高温状态的预塑坯进行吹塑成型的情况下,如果预塑坯底部具有与预塑坯主体部相同程度的厚度,则持续保持热量的程度较高,容易被拉伸杆刺破。因此,将预塑坯底部设计成薄壁,从而容易利用注射成型模具进行冷却,并能够提高预塑坯底部的强度。
例如,通常也将预塑坯底部的最下端的壁厚设定为1.0mm(浇口部分除外),将形成中空成型体(瓶)的包含肩位置在内的主体部分的、预塑坯主体部的壁厚设定为2.1~2.2mm,并使预塑坯底部的壁厚与预塑坯主体部的壁厚的比为1比2的程度,来设定预塑坯的形状。
通过使注射型芯模的外表面粗糙,使得预塑坯的脱模性良好,并且使预塑坯底部的壁厚变薄,从而即使提前预塑坯的脱模时机,也不会发生拉伸时的破损,从而能够缩短预塑坯的成型周期,提高中空成型体的生产效率。
但是,对于注射型芯模的外表面而言,在与预塑坯对应的面的整面实施了粗糙面加工(粗糙加工),因此存在如下不良情况:在吹塑成型的中空成型体的底面,转印有粗糙加工痕迹,并且在进行了拉伸的状态下呈现。
即,对于预塑坯主体部而言,形成成型体主体部时的拉伸、扩展程度较大,因此从注射型芯模侧转印的粗糙加工痕迹会扩展而消失,但是对于预塑坯底部而言,则是在确保一定程度的硬度的状态下进行拉伸,因此拉伸、扩展程度较小,转印的粗糙加工痕迹会残留且成为扩展于整个底面的状态。
因此,有可能以残留有粗糙加工痕迹的状态形成有中空成型体的底部,出现有损于中空体外观的不良情况。
因此,本发明针对上述情况,以获得底部美观整齐的中空成型体为目的,其技术问题在于,有效利用使注射型芯模的外表面粗糙的优点,当使用使底部成为薄壁进行成型的预塑坯制造中空成型体时,不会在中空成型体的底部出现粗糙加工痕迹。
(二)技术方案
为了解决上述技术问题,本发明提供一种注射成型模具,其具备注射型芯模和注射型腔模,使如下的预塑坯成型,在所述预塑坯中,预塑坯底部与预塑坯主体部相比而言壁厚较薄,其特征在于,注射型芯模的前端部的外表面对应于预塑坯底部和与预塑坯底部连续的预塑坯主体部的下端,与该预塑坯底部和预塑坯主体部的下端对应的面是镜面加工面,注射型芯模的所述镜面加工面以外的预塑坯对应面是粗糙面。
此外,所谓的镜面,例如是指:相当于使JIS B 0601:2001下的算术平均粗糙度Ra为0.2μm以下、使最大高度Rz为0.8μm以下的表面粗糙度(旧标记中的三角符号▽▽▽▽)的表面加工的状态。但是不限于该值。
而且,在上述注射成型模具的发明中,优选地,粗糙面是使注射型芯模的外表面以形成沿着注射型芯模的高度方向的纵向的微细槽的方式粗糙化的加工面。
另外,为了解决上述技术问题,另一个发明提供一种注射拉伸吹塑成型机,其特征在于,具备:注射成型部,其具有对预塑坯进行注射成型的注射成型模具;以及吹塑成型部,其对注射成型的预塑坯进行拉伸,吹塑成型中空成型体,注射成型部的注射成型模具具备注射型芯模和注射型腔模,使如下的预塑坯成型,在所述预塑坯中,预塑坯底部与预塑坯主体部相比而言壁厚较薄,注射型芯模的前端部的外表面对应于预塑坯底部和与预塑坯底部连续的预塑坯主体部的下端,与该预塑坯底部和预塑坯主体部的下端对应的面是镜面加工面,注射型芯模的所述镜面加工面以外的预塑坯对应面是粗糙面。
而且,在上述注射拉伸吹塑成型机的发明中,优选地,粗糙面是使注射型芯模的外表面以形成沿着注射型芯模的高度方向的纵向的微细槽的方式粗糙化的加工面。
而且,为了解决上述技术问题,此外另一个发明提供一种中空成型体的制造方法,其具有:注射成型工序,注射成型预塑坯;以及吹塑成型工序,对通过注射成型工序得到的预塑坯进行拉伸,并且吹入气体而吹塑成型中空成型体,其特征在于,在注射成型工序中利用具备注射型芯模和注射型腔模的注射成型模具来注射成型预塑坯底部与预塑坯主体部相比而言壁厚较薄的预塑坯,注射型芯模的前端部的外表面对应于预塑坯底部和与预塑坯底部连续的预塑坯主体部的下端,与该预塑坯底部和预塑坯主体部的下端对应的面是镜面加工面,注射型芯模的所述镜面加工面以外的预塑坯对应面是粗糙面。
而且,在上述中空成型体的制造方法中,优选地,在进行吹塑成型工序时,由与注射型芯模的镜面加工面对应的预塑坯的预塑坯底部和预塑坯主体部的下端,形成中空成型体的底部和从该中空成型体的底部朝向中空成型体的主体部连续的立起部。
而且,优选地,粗糙面是使注射型芯模的外表面以形成沿着注射型芯模的高度方向的纵向的微细槽的方式粗糙化的加工面。
(三)有益效果
本发明的注射成型模具使如下的预塑坯成型,在所述预塑坯中,预塑坯底部与预塑坯主体部相比而言壁厚较薄,与预塑坯底部和预塑坯主体部的下端对应的、注射型芯模的前端部的外表面是镜面加工面,因此能够在从预塑坯主体部的下端到预塑坯底部的部分(内表面)转印镜面加工面的面形状。
而且,在注射型芯模中的预塑坯对应面中,镜面加工面以外的部分是粗糙面,因此从预塑坯拔出注射型芯模的脱模顺畅,高温且软质状态的预塑坯不会在脱模时倒型。
而且,在进行注射成型的阶段,由于从预塑坯主体部的下端开始预塑坯底部的壁厚较薄,因此容易进行冷却,即使进入吹塑成型的阶段,也能够抑制预塑坯底部的破损,具有能够适当地制造中空成型体的效果。
附图说明
图1是概要表示本发明的注射拉伸吹塑成型机一例的说明图。
图2是表示研究技术中的注射成型模具的说明图。
图3是表示上述研究技术中的吹塑成型模具的说明图。
图4是表示注射成型模具一例的说明图。
图5是将在吹塑成型模具中配置了预塑坯的状态和吹塑成型了中空成型体的状态一并示出的说明图。
附图标记说明
1-注射拉伸吹塑成型机;3-注射成型部;4-吹塑成型部;5-取出部;6-预塑坯;7-注射成型模具;8-唇模;9-吹塑成型模具;10-预塑坯底部;10a-预塑坯底部的最下端;11-中空成型体;12-注射型芯模;13-注射型腔模;14-预塑坯主体部;14a-预塑坯主体部的下端;14b-预塑坯主体部的普通部;15-粗糙加工面;16-预塑坯口部;17-肩部;18-主体部;19-下圈部始端;20-镜面加工面;21-底部;22-接地部;23-立起部。
具体实施方式
图中1概要地示出制造PET瓶、广口瓶等合成树脂制的中空成型体的注射拉伸吹塑成型机1。
(注射拉伸吹塑成型机)
注射拉伸吹塑成型机1是以热型坯形式制造中空成型体的装置,如图1所示,在具有唇模8的未图示的旋转板的旋转方向上,依次配置有:从注射装置2送入熔融树脂的注射成型部3、对中空成型体进行吹塑成型的吹塑成型部4、将中空成型体向成型机外送出的取出部5。在图1中标注了箭头的移动表示旋转板的旋转方向,示出了唇模8的移动方向。
以下对构建本发明时所研究的研究技术和本发明的实施方式进行说明。此外,在研究技术和本发明的实施方式中,注射拉伸吹塑成型机1与图1所示的基本结构相同。
(研究技术)
首先,在研究技术中,使用图2所示的注射成型模具7来注射成型预塑坯6,并向该预塑坯6的凸的方向拉伸,并进行气体吹入而吹塑成型广口的杯状容器A。
对于在研究技术中使用的注射成型模具7而言,由向下方凸的圆顶状的注射型芯模12和呈研钵状向上方开放的注射型腔模13构成,且构成为当进行注射成型时组合有唇模8。
而且,对于注射成型模具7注射成型的预塑坯6而言,如图3所示那样,呈向上方开放的研钵状,且由预塑坯底部10和预塑坯主体部14构成,预塑坯主体部14从预塑坯底部10向上方呈伞状扩开并连续,预塑坯6在上缘具备口部。
而且,预塑坯6是使预塑坯底部10的壁厚比预塑坯主体部14的壁厚小的形状。作为具体的例子,预塑坯底部10的壁厚是1.2mm,预塑坯主体部(如伞张开的部分)的壁厚是2.0mm。
在该注射成型模具7中,以使得预塑坯底部10的壁厚比预塑坯主体部14的壁厚薄的方式来注射成型预塑坯6,容易进行预塑坯底部10的冷却。通过使预塑坯底部10的冷却容易进行,从而即使在从注射成型模具7脱模而配置于吹塑成型模具9内的时刻,预塑坯底部10也保持为较硬的状态,因此即使进行拉伸的操作也不会破损。
图3示出了在作为研究技术构成的注射拉伸吹塑成型机1中,在吹塑成型模具9上配置有研钵状的预塑坯6的状态、以及吹塑成型的杯状容器A。在吹塑成型模具9中,如上所述,预塑坯底部10是薄壁且较硬的状态,因此,通过接受利用拉伸和吹入空气等进行的吹塑,从而沿着预塑坯6的径向(与预塑坯6的高度方向正交的方向)扩展,形成杯状容器A的容器底部B。
另一方面,关于预塑坯主体部14,由于与预塑坯底部10相比而言壁厚较厚并且维持软质状态,因此通过拉伸和吹塑而沿着上下方向和径向伸展,形成容器主体部C。
在该研究技术中,注射型芯模12的与预塑坯底部10对应的下端的外周面是粗糙加工面15,是设置了多个从最下端部的位置起沿着型芯模表面朝向上方的纵向的微细槽的面。如果举出具体的加工例子,则可以是利用所需的粒度标号的砂纸进行纵向的粗糙化加工。
另外,与预塑坯主体部14对应的注射型芯模12的外表面被设定为镜面加工面20,该镜面加工面20是以使得其能够形成规定的表面粗糙度以下的光滑面的方式利用研磨剂、研磨膏等进行研磨而形成的镜面。此外,在图3中将预塑坯底部10的外周部分与容器底部B的外周部分用单点划线连结,容易理解预塑坯底部10形成容器底部B时的扩展程度。
根据该研究技术,能够确认:在对研钵状的预塑坯6进行成型的注射成型模具7中,通过使预塑坯底部10的壁厚变薄来成型,从而能够在对预塑坯6进行吹塑成型时,防止预塑坯底部10破损。
另外,关于在注射型芯模12的下端设置粗糙加工面15这一点,是为了抑制在开模时向预塑坯6施加撕裂的力而使空气进入预塑坯型芯层导致的不良情况,从而能够良好地进行脱模。并且可知:在使预塑坯底部10的壁厚变薄的设定下,即使将脱模的时机提前,也能够良好地从预塑坯6分离注射型芯模12。
接着,基于图4和图5对本发明的实施方式进行说明。如上所述,注射拉伸吹塑成型机1中的基本结构与研究技术中的说明相同。
在实施方式的注射拉伸吹塑成型机1中,注射成型部3具有注射成型模具7,该注射成型模具7利用来自注射装置2的熔融树脂来注射成型预塑坯6。并设置为,能够使预塑坯6被组合于注射成型模具7的唇模8支撑,并从注射成型模具7分离,向吹塑成型部4移动。
吹塑成型部4具有组合式的吹塑成型模具9,将唇模8与吹塑成型模具9组合,并将预塑坯6配置于该吹塑成型模具9的内部,之后,未图示的拉伸杆进入预塑坯6的内侧,来进行对预塑坯底部10进行按压的拉伸,并且吹入气体,从预塑坯6吹塑成型中空成型体11。
对于吹塑成型的中空成型体11而言,利用从吹塑成型模具9分离的唇模8的移动,从吹塑成型部4向取出部5移动。移动到取出部5的唇模8打开,解除对中空成型体11的口部的保持,中空成型体11被送出到成型机外。
唇模8设置为能够再次关闭并向注射成型部3移动。移动到注射成型部3的唇模8与注射成型模具7组合,并且如上述那样,在注射成型模具7中送入熔融树脂来注射成型预塑坯6。
(中空成型体的制造方法)
在这样利用注射拉伸吹塑成型机1来制造中空成型体时,通过依次进行注射成型工序、吹塑成型工序、取出工序,从而获得中空成型体11,其中,上述注射成型工序在注射成型部3中对预塑坯6进行注射成型,上述吹塑成型工序通过吹塑成型部4,对在注射成型部3中得到的预塑坯6中进行拉伸,并进行吹扩而吹塑成型中空成型体11,在上述取出工序中,通过吹塑成型部4吹塑成型的中空成型体11到达取出部5,将上述中空成型体11从该取出部5向成型机外送出。
而且,唇模8的移动是通过上述旋转板以规定角度旋转来进行的,在从注射成型工序向吹塑成型工序转移时,唇模8以保持预塑坯6的方式支撑预塑坯6并进行移动,在从吹塑成型工序向取出工序转移时,唇模8同样地支撑着中空成型体并进行移动,而且,在从取出工序向注射成型工序转移时,只有释放了中空成型体的唇模8向注射成型部移动。
这样,通过使唇模8依次从注射成型部3向吹塑成型部4移动、从吹塑成型部4向取出部5移动、从取出部5向所述注射成型部3移动,从而连续进行注射成型工序、吹塑成型工序、取出工序来制造中空成型体11。此外,旋转板以与注射成型部3、吹塑成型部4、取出部5对应的方式在三处具备唇模8,能够通过这三处各自的唇模8经过不同阶段的上述工序来进行中空成型体的制造。
(注射成型模具)
如图4所示,注射成型部3的注射成型模具7具备注射型芯模12和注射型腔模13,并组合上述唇模8来注射熔融树脂。对于由该注射型芯模12、注射型腔模13、唇模8构成的注射成型模具7而言,以使得预塑坯底部10比预塑坯主体部14薄的方式,也就是说,以使得从预塑坯主体部14的下端14a到预塑坯底部10的最下端10a逐渐变薄的方式来进行成型。
通过以使得从预塑坯主体部14的下端14a到预塑坯底部10的最下端10a逐渐变薄的方式来进行成型,从而能够加快注射成型模具7内的从预塑坯主体部14的下端14a到预塑坯底部10的冷却,并提高预塑坯底部10周围的硬度,在通过吹塑成型部4进行拉伸时,能够防止预塑坯底部10侧被拉伸杆刺破。
关于图4所示的注射成型模具7,能够如上述那样来注射成型预塑坯6,关于该预塑坯6,从预塑坯主体部14的下端14a到预塑坯底部10的最下端10a逐渐变薄,且在最下端10a的位置最薄。此外,对于最下端10a的薄壁的状态,以不含浇口部分为前提进行了说明。
(注射型芯模)
而且,在本发明实施方式的注射成型模具7中,在注射型芯模12的外表面除了以下说明的一部分之外设置有粗糙加工面15。粗糙加工面15是如下这样的面,即:使镜面加工研磨为规定的表面粗糙度的注射型芯模12的外表面以形成沿着预塑坯6的高度方向的方向即纵向的微细槽的方式进行了纵向的粗糙化而成的面。
(粗糙加工面)
粗糙加工面15是用于使送入注射成型模具7内的熔融树脂的流入顺畅良好,并且使脱模时的注射型芯模12的拔出顺畅良好的加工,加工成符合此目的的表面粗糙度。
在图4中标注了斜线的区域表示粗糙加工面15的具体位置,图5示出了预塑坯6中的与粗糙加工面15对应的部分,预塑坯6的预塑坯口部16的内表面与做成中空成型体11时成为肩部17、主体部18、下圈部始端19的预塑坯主体部14的普通部14b的内表面对应的部位是实施纵向的粗糙化而成的粗糙加工面15。
(粗糙加工面)
另一方面,注射型芯模12的外表面的前端部(注射型芯模的下端部分)是不进行粗糙化而进行了镜面加工的镜面加工面20。镜面加工面20是与预塑坯6中的从预塑坯主体部14的下端14a的内表面到预塑坯底部10的最下端10a的内表面对应的面,对这些内表面转印镜面加工面20的镜面状态。
就转印了镜面加工面20的镜面状态的从预塑坯主体部14的下端14a到预塑坯底部10的最下端10a的部分而言,在吹塑成型工序中形成为立起部23,该立起部23从中空成型体11的底部21和该底部21外周边的接地部(线尾)22朝向预塑坯主体部14扩径,并且与下圈部始端19连续。
在图5中用单点划线连结预塑坯主体部14的下端14a的外周部分与中空成型体11的所述立起部23的外周部分,容易理解预塑坯主体部14的到下端14a为止的区域成为中空成型体11的到立起部23为止的区域时的扩展程度。
如图4和图5所示,对于从预塑坯底部10的最下端10a到预塑坯主体部14的下端14a为止的区域而言,成为转印了注射型芯模12的镜面加工面20的状态,因此在中空成型体11的底部21和立起部23上没有转印粗糙化痕迹,能够得到无损底部美观的中空成型体11。
此外,在本发明中,用于形成镜面加工面20的加工方法没有限定。
另外,对于镜面加工面20的表面状态而言,也可以呈现为如上述那样使JIS B0601:2001下的算术平均粗糙度Ra为0.2μm以下的状态、或者相当于使最大高度Rz为0.8μm以下的表面粗糙度的表面加工状态,但是不限于表示上述粗糙度的数值。
Claims (7)
1.一种注射成型模具,其具备注射型芯模和注射型腔模,使如下的预塑坯成型,在所述预塑坯中,预塑坯底部与预塑坯主体部相比而言壁厚较薄,其特征在于,
注射型芯模的前端部的外表面对应于预塑坯底部和与预塑坯底部连续的预塑坯主体部的下端,与该预塑坯底部和预塑坯主体部的下端对应的面是镜面加工面,注射型芯模的所述镜面加工面以外的预塑坯对应面是粗糙面。
2.根据权利要求1所述的注射成型模具,其特征在于,
粗糙面是使注射型芯模的外表面以形成沿着注射型芯模的高度方向的纵向的微细槽的方式粗糙化的加工面。
3.一种注射拉伸吹塑成型机,其特征在于,具备:
注射成型部,其具有对预塑坯进行注射成型的注射成型模具;以及
吹塑成型部,其对注射成型的预塑坯进行拉伸,吹塑成型中空成型体,
注射成型部的注射成型模具具备注射型芯模和注射型腔模,
使如下的预塑坯成型,在所述预塑坯中,预塑坯底部与预塑坯主体部相比而言壁厚较薄,
注射型芯模的前端部的外表面对应于预塑坯底部和与预塑坯底部连续的预塑坯主体部的下端,与该预塑坯底部和预塑坯主体部的下端对应的面是镜面加工面,注射型芯模的所述镜面加工面以外的预塑坯对应面是粗糙面。
4.根据权利要求3所述的注射拉伸吹塑成型机,其特征在于,
粗糙面是使注射型芯模的外表面以形成沿着注射型芯模的高度方向的纵向的微细槽的方式粗糙化的加工面。
5.一种中空成型体的制造方法,其具有:
注射成型工序,注射成型预塑坯;以及吹塑成型工序,对通过注射成型工序得到的预塑坯进行拉伸,并且吹入气体而吹塑成型中空成型体,其特征在于,
在注射成型工序中利用具备注射型芯模和注射型腔模的注射成型模具来注射成型预塑坯底部与预塑坯主体部相比而言壁厚较薄的预塑坯,注射型芯模的前端部的外表面对应于预塑坯底部和与预塑坯底部连续的预塑坯主体部的下端,与该预塑坯底部和预塑坯主体部的下端对应的面是镜面加工面,注射型芯模的所述镜面加工面以外的预塑坯对应面是粗糙面。
6.根据权利要求5所述的中空成型体的制造方法,其特征在于,
在进行吹塑成型工序时,由与注射型芯模的镜面加工面对应的预塑坯的预塑坯底部和预塑坯主体部的下端,形成中空成型体的底部和从该中空成型体的底部朝向中空成型体的主体部连续的立起部。
7.根据权利要求5或6所述的中空成型体的制造方法,其特征在于,
粗糙面是使注射型芯模的外表面以形成沿着注射型芯模的高度方向的纵向的微细槽的方式粗糙化的加工面。
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