CN1925961A - 多层物料 - Google Patents
多层物料 Download PDFInfo
- Publication number
- CN1925961A CN1925961A CNA200580006727XA CN200580006727A CN1925961A CN 1925961 A CN1925961 A CN 1925961A CN A200580006727X A CNA200580006727X A CN A200580006727XA CN 200580006727 A CN200580006727 A CN 200580006727A CN 1925961 A CN1925961 A CN 1925961A
- Authority
- CN
- China
- Prior art keywords
- layer
- resin
- symmetry axis
- functional
- goods
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
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Images
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Abstract
一个用于模压法制备多层制品的具有对称轴的多层物料,其由第一合成树脂和一个被包裹在所述第一树脂中的功能细层3组成,所述层3小于物料体积的20%,该多层物料的特征在于,层3形成了对称轴旋转体的壳体,并且该层到对称轴的距离可以变化。
Description
技术领域
本发明涉及一种模压多层物料来制备多层制品的方法。
背景技术
美国专利US4876052公开了一种多层物料(图1),其特征在于功能树脂3被完全地包裹在合成树脂2中。功能树脂和外层树脂具有本质上的不同。例如,功能树脂具有良好的阻隔性,而挑选形成外层的树脂主要是考虑机械和卫生性能。可以模压这些多层物料来得到多层制品。然而,根据美国专利US4876052所公开的方法而制得的制品,其要求制品中有大量的功能性树脂,因此产生了两个主要的缺点:第一是高额的成本;第二是对机械应力具有降低了的对抗力。在功能性树脂和外层树脂之间缺乏粘着从而降低了制品的坚实性并且外层还有脱落的危险。美国专利US4876052的另一个缺点在于很难调整树脂2和3各自的用量。如本发明在下面进一步描述的,这些用量是受到制品的形状和压缩过程中物料的流率所限定。
日本专利JP2098415提出从复合物料(图2)开始模压来制备多层制品,该复合物料的特征在于合成树脂2仅覆盖了功能性树脂3的侧面。沿着该物料的对称轴进行模压制成了多层结构的制品,该制品的特征在于合成树脂2部分包裹了功能性树脂3。然而,根据日本专利JP2098415用两种树脂所制备的多层制品具有两个主要的缺点:第一,暴露在制品的中心表面区域的功能性树脂3,该暴露区域超过了制品总表面积的至少10%,第二,制品中功能性树脂3的必须量至少为树脂总量的30%。因此,一方面,所生产的制品价格昂贵,另一方面,制品的机械性能被严重改变,主要在制品的中心。日本专利JP2098415的另一个缺点在于很难调整树脂2和3各自的用量,这些用量是由制品的形状和压缩过程中物料的流率所决定。
在日本专利JP2098415中所提出使用的是含有3层的物料,其目的在于部分消除前面所述的缺陷(图3)。该物料的构成为:形成物料中心部分的第一树脂4,仅覆盖了第一树脂侧面的功能性树脂3,仅覆盖了功能性树脂侧面的第三树脂2。对该复合物料沿其对称轴进行挤压就形成了多层制品。利用三层物料的优点在于降低了功能性树脂3的使用量,并且与含有单层树脂2的相同制品相比,利用三层物料所制得的制品在机械性能方面改变很小。该方法可以在不同性质的树脂间添加粘着层,从而改变了制品的粘着性和坚实性。然而,功能性树脂3并没有覆盖多层制品的中心部分,因此所制得的制品在对称轴附近表面区域不具备阻隔性,并且该表面区域超过了至少10%的制品表面。该制品的中心区域没有被阻隔树脂层3所覆盖,因而降低了制品的阻隔性能并且使得该方案有效性很低。
专利申请CH01619/04描述了由多层物料模压所制备的多层制品(图4)。在该专利申请中所描述的制品具有多层结构,其特征在于功能层为锯齿形双折。即使是在中心部分,该功能层恰当地分布贯穿于制品。专利申请CH01619/04中所描述的制备多层制品的方法可以控制功能层的厚度。可以在形成制品表面的树脂和功能树脂之间添加粘着层。然而,对该物料的压缩要求一种方法和一种特定的模塑装置。相对于基本的压缩工艺,该方法特别要求附加的模具工具运动,设定了模具两部分之间的相对运动。这样在高速模塑的情况下,会损害专利申请CH01619/04中所描述的压缩装置。
发明内容
本发明涉及通过模压法制备的多层制品,并消除了前述问题。更为特别的是,制备单层制品所使用的压缩装置无需改变就可以用于本方法中。
本发明包括一种用于模压制备多层制品的具有一个对称轴的多层物料,其由第一合成树脂和一个被所述第一树脂所包裹的功能细层构成,所述功能层小于整个物料体积的20%。多层物料的特征在于功能层形成了对称轴旋转体的壳体,并且层到对称轴的距离是可变的。
通过下图来对实施例进行详细的描述以便更好地理解本发明。
附图说明
图1-4为在先技术中用于模压制备多层制品的多层物料。
图1为美国专利US4876052中所制备的双层物料。
图2为日本专利JP2098415中所用的双层物料。
图3为日本专利JP2098415中所描述的含有3层的物料。
图4为专利申请CH01619/04中所描述的环形多层物料。
图5为本发明通常概念的多层物料。
图6为物料压缩过程中的物质流动和速度分布图。
图7为如日本专利JP2098415所描述的物料的压缩,以及所制得的多层制品。
图8为日本专利JP2098415所制得的多层制品的限度范围。
图9-20为多层物料实施例,及其制备方法,以及一个所用装置的实施例。
图9为相应本发明物料的第一实施例。
图10为对图9所描述的物料进行压缩而制成的多层制品。
图11为根据本发明所制得的物料,其包括5层。
图12a和12b描述了属于本发明范围的环形物料。
图13为压缩来自图12a的物料所制得的多层制品。
图14为本发明的另一个物料实施例。
图15-19为制备图9、11、12和14中所示物料的方法。
图15说明了制备物料的第一种方法,其根据了其中一层周期性变化的流速。
图16是制备物料的第二种方法,其根据了其中两层以位相相反的方式作周期性变化的流速。
图17是用于制备多层物料的多层杆,并且可以根据图16的制备方法来制备该多层杆。
图18是制备物料的第三种方法,其根据了所有层的周期性变化流速并且总流速有少许波动。
图19是制备多层物料的另一种方法,其根据了每层的周期性变化流速并且周期内总流速为0。
图20是根据本发明制备多层物料的装置。
图21-27是多层物料、制备方法及其装置的另外的实施例。
图21是本发明另外一种类型的多层物料。
图22是对图21所描述的物料进行压缩而制成的多层制品。
图23a-23d是制备图21所示物料的方法。
图24a-24c是将物料输送进压缩模具的方法。
图25a-25c是在压缩装置中对物料的压缩。
图26是可以用于制备多层物料的装置的通常概念。
图27是用于制备图21所示物料的装置。
具体实施方式
本发明还包括根据图5所示的多层物料的制备方法。该物料包括形成物料的第一合成树脂和至少一个被第一树脂所包裹的第二树脂,并且所形成细层与对称轴之间的距离R及其厚度E会根据对称轴Z位置而变化。该物料类型使得模塑制品中的阻隔树脂层和该层厚度配合达到最优。
为了更好的理解前面所描述的物料,则有必要考虑物料压缩过程中树脂的流动(图6)。该流动主要取决于压缩过程中树脂的流变特性以及制品的形状。图6显示了位于模具壁问中部的流速要高于靠近模具壁的流速。在最接近模具壁的位置,粒子的流速趋向零,但是剪切变形很大。相反,在壁间中部位置上,粒子的流速最大但是剪切变形最小。在流动中,功能性树脂层被夹带并且根据流速量变的位置产生非均一变形。制品中功能性树脂层的最终位置取决于功能层在物料中的最初位置以及流动过程中所产生的变形量。
图7a-7c说明了如日本专利JP2098415所描述的物料的压缩,目的在于说明根据该方法所制得的多层制品的局限性并且能更好地理解本发明的主题。图7a为根据日本专利JP2098415所制备的三层物料。该物料包括形成物料中心部分的第一树脂4,其仅覆盖第一树脂侧面的功能树脂3,和仅覆盖了功能树脂侧面的第三树脂2。该物料的高度记为H1,外层半径为R1,并且功能层的径向位置为R。压缩该物料产生了图7b所述的中间步骤。图7b显示了被部分压缩物料中功能层的变形。非常值得注意的是该层在向着制品外周的方向开始变形,也就是说在流动的方向上,制品的中心部分不会被功能层所覆盖。也颇有兴趣的注意到,在中间步骤中,功能层仍然远离物质前面,这说明了中间步骤所得到的制品在外周上不具备阻隔性能。图7c说明了进一步压缩所得到的制品。功能层3延伸到制品的末端,而仍旧被制品外周所包裹。如图7c所示,功能层并没有延伸到制品的中心部位。因此,根据该方法制备的制品存在中心不具有阻隔性能的缺点。
可以由如图7a所描述的物料来制备如图7c所述的制品。图8中绘制了实验结果图。制品的表面积被记做Sp,没有被功能层覆盖的多层制品的中心表面积被记做S,制品的厚度被记做E,物料的厚度被记做H1。比率H1/E代表了压缩比。没有被功能层所覆盖的表面积比例为S/Sp,图8显示了S/Sp的变化是压缩比H/H1变化的函数。甚至在压缩比为20时,比率S/Sp还大于10%。这结果说明了在最好的情况下,功能层覆盖了90%的制品表面。对被功能层覆盖了90%表面积的制品进行了阻隔性能测试,结果表明,与根据本发明具有100%功能层表面覆盖的相同的制品相比,该制品的透气至少高出10倍。上述结果的取得是使用了比基本树脂透气低100倍的功能树脂。
图9为本发明多层物料的第一实施例。该物料包括:被功能树脂层3包裹的第一树脂层4,所述功能树脂层3本身被包裹在形成物料1外层表面5的树脂层2中。功能层的每个端点7和7’汇集在1点,这样层4就被完全地包裹在功能层3中。物料中功能层的位置使得100%的制品表面都被覆盖了,也就是说,在压缩中制品的外周和中心都被覆盖了。根据图9所示的侧面图,这就确定了物料中的功能层位置,在两个端点7和7’中形成了封闭的区域,并在接近物料中间的位置形成了鼓起10。鼓起的径向位置并不是任意的,它是被制品及物料的形状所决定的。鼓起10精确的径向位置使得层可以延伸到制品的外周并且确保功能层仍旧被制品所包裹。实验表明物料中功能层鼓起的径向位置是压缩比、制品形状以及树脂流变性的函数。
图10为该物料压缩所制备的多层制品实施例。该制品的特点在于具有覆盖了整个制品表面的双层功能树脂。可以通过在简单压缩装置中压缩多层物料来制备该制品,并不需要改变用于单层物料制备相同制品的压缩装置。在对称轴方向上仔细观察该多层制品,如图10所示,会发现功能层端点7和7’形成了垂直层表面的突起。
图11显示了本发明并不限于如图9所示的三层物料。如图11所示的一个包含5层的物料有着特别的优点,因为在阻隔层3a的每侧都插入了粘着层3b和3c,这就使得所结合的树脂具有了不同的特性,同时还确保了不同层间的良好粘着,这就避免了多层制品可能存在的层裂或脱裂的问题。粘着层和阻隔层平行设置并且用量都很小。粘着层3b和3c以及阻隔层3a的集合体形成了功能层3,并且该集合体中树脂用量小于形成物料的整体树脂体积的15%,并且优选在10%之内。
图12a和12b说明了本发明并不限于如图9中所示的圆柱形物料,这些物料可以是环形的,用于制备含有孔道的多层制品。如图12a和12b所示的环状多层物料尤其适于制备含有孔道的多层制品,例如用于制备管头。当压缩图12a所示的物料时,会产生向着外周和向着中心方向的共同流动;而当压缩图12b所示的物料时,仅仅会产生向着外周方向的流动。
图13为对如图12所示的多层物料进行模压而制得的管头。在制品的厚度上可以看出双功能层覆盖了制品的整个表面。功能层延伸到了制品的外周并且此延伸还远至孔道,并且仍保持了整体被包裹。为了在两个方向上都控制层的延伸,则有必要调整物料内功能层的形状和位置。
可以制备类似图9和图12中所示的物料。图14为一种多层物料,其中树脂层4侧部被功能树脂3细层所包裹,该细层本身被形成物料外层表面5的树脂层2所包裹。功能树脂层3为轴对称梨形形状,并且在两端点保持了开口,端点开口半径Rmin小于或等于80%的功能层鼓起处的最大半径Rmax,Rmin优选小于10%的Rmax。图14所示的物料显著不同于日本专利JP2098415(图3)所提出的物料,该物料的特征在于功能层为圆柱形状。如日本专利JP2098415所描述的,挤压物料所产生的功能树脂层的形状,如图3所示,并非完美的圆柱形,而是有轻微的变形。自然引起功能层轻微变形的原因在于从挤压机中出来所带来的应力松弛(膨胀现象)和重力影响,物料自身的重量使得物料有所下垂。物料的这些变形使得所产生的功能层形状中,最小半径Rmin大于80%的最大半径Rmax。如前所述的,这种类型的物料不可能制备出具有良好隔绝性能的多层制品,原因在于制品中心的表面区域没有被功能层所覆盖。本发明还可以通过显著增加被隔绝层所覆盖的制品的表面积来改善多层制品的隔绝性能。如在下面进一步描述的,制备如图14所示的多层物料需要特殊的设备,并且不能根据日本专利JP2098415所描述的方法来制备。
下面所述的用于制备多层制品的方法尤其适用于制备如塞子、盖子、压片,或,还有管肩的制品。该方法也非常适合用于制备板状预成品,这些板材通过热成型或吹热成型来制备多层制品。
可以根据很多方法来制备图9、11、12和14所示的物料。这些不同的方法有一个共同点,即均存在树脂的共挤以制备多层结构,并且至少以可变流速来挤出形成多层结构中心层4的树脂。
图15说明了第一制备物料方法。用这种方法可以制备出如图14中所示的多层物料。该方法包括连续共挤如图15所示的多层杆。形成物料外层表面的层2与功能层的流速都是不变的。另一方面,形成物料内层的层4的流速在最大和最小值之间呈周期性波动变化。流速变化周期限定了相应于物料长度的波长并且限定多层杆的切削频率。本发明特别有利于以高速来制备多层物料。图15所示的制备方法同样也可用于制备层4完全被功能树脂3包裹的物料。对此,树脂层4必须具有在最大流速和速度为0之间波动变化的流速。
图16说明了第二制备物料方法。该方法不同于图15所示的方法,不同在于树脂层2和4的流速以位相相反的方式作周期性变化,这样总流速可以保持稳定或波动很小。功能层的流速保持稳定。离开共挤装置的多层杆的切削频率被层2和4流速的周期变化所决定。本发明有利于防止因为总流速过分突然变化所带来的问题(挤出不稳定性,皱皮)。离开共挤装置后的层2和4流速,即使如图15所示的控制信号是闪控式的,该流速也是逐渐变化的。该现象与装置中树脂的惯性相关联。也有可能通过使用恰当的装置来逐渐控制速度变化。
图17为根据图16的方法所制备出的多层杆。对离开共挤装置的多层杆进行周期切削可以制得多层物料。多层杆是可以通过挤出恒定流速的功能层和挤出以位相相反的方式且作周期性变化流速的树脂层2和4来制得的。树脂层4具有在最大流速和速度为0之间周期性波动的流速,从而导致了树脂层4完全被功能树脂层所包裹。
图18为与图9所示物料相同的多层物料的制备方法。该方法包括共挤出多层杆,该多层杆包括一个树脂层4、一个功能层3和一个形成杆外表面的树脂层2。树脂层2和4的流速以位相相反的方式作周期性变化,形成杆外层的树脂2的流速在最小和最大值之间呈周期性波动变化。功能层3的流速呈周期变化并且在t1周期内流速为0。层4的流速也呈周期变化并且在t2周期内流速为0。物料生产的频率影响了层的流速变化。在周期t2中只有外层2被挤出,在周期(t2-t1)中只有层2和3被挤出。
另外一种制备如图14所示的多层物料的方法,其中包括一个不连续挤出工艺,其特征在于被共挤的树脂总流速在最大值和0之间呈现波动变化,在一个周期中所用的物质量相应于一个物料。图19说明了该制备方法。在周期t1中,总共挤流速为0,在周期t2-t1中只有层2和3被挤出,这就使得层4被功能树脂层3所包裹。根据方法19来制备多层物料的方法有利于多层物料的体积计量,因此物料就更齐整了。
本发明并不限于一种制备三层物料的方法。例如,对于如图11所示的5层物料的制备,可以使用类似图18所述的控制方法。
类似的,本发明并不限于制备圆柱形物料,例如,也可以制备环形物料。
根据图15-18所示的方法,可以使用许多装置来制备多层物料,这些方法包括共挤多层杆或管并且一层或多层的流速为周期性变化,接着切削多层杆或管以形成物料。该装置包括至少一个连接多个挤出机的共挤出头以将熔融树脂输入到共挤出头中,其还包括使得一或多层流速呈周期性变化的设备。
图20为一个装置的实施例,该装置用来制备多层物料。该装置包括用于分别输送树脂2、3和4的管道11、12和13,其中树脂3用于形成功能层、树脂2和4分别用于形成物料的外和内层。管道11、12和13通过适宜的已知方法与挤出机相连。该装置也包括一个分配器14,通过其每层都可以得到圆周上合适的分配。可以利用几种分配器,例如螺旋分配器或心型分配器或混合分配器。该装置包括联接器15,其使得杆或挤出管的形状随着联接器形状的改变而改变。优选地,该装置在树脂层2、3和4上还有一个普通连接16。通过改变层2和4各自的流速,该普通连接16使得功能层3位置的变化更容易。该装置中还有设备17和18,该设备使得树脂层2和4的流速发生周期性变化。活塞的向下运动使得压力增大,从而使得层流速增大。相反,活塞的上升使得压力降低从而降低了层流速。为了得到更高的效率,活塞可以和一个或两个切断阀门相连,第一个阀门位于活塞的上游,第二个位于活塞的下游。活塞可以是机械驱动或者是气缸驱动的。本发明并不限于前述的装置。活塞和切断阀门可以相同的与功能层3相连。图20中所描述的类似装置也可用来制备5层物料。
图21说明了另外一种具有特别优点的多层物料,该物料用于模压制备多层制品。该物料包括形成物料内部的第一树脂层4、一个包裹树脂层4的功能树脂细层,和一个形成物料外层并包裹功能树脂层3的树脂层2。该功能层3为三维、梨形轴对称形状,其端口7位置接近对称轴并形成了一个小锥形开口。层3在所述端点7相对的位置点与对称轴相交。
这些多层物料特别有利于在模具中通过模压法来制备多层制品。图22为图21所示的物料制备而得的多层制品。该制品包括被包裹在制品壁内的一个双功能层3a和3b,所述的功能层在制品的对称轴上不连续。这种不连续的形式是在制品的功能层3b上形成了一个小直径的孔。该孔相应于功能层3上的端点7。功能层3b上所述该孔的直径小于10mm,通常小于3mm。由图21所示的物料制备而得的多层制品22具有完全不在制品表面上的第一层3a,和具有一个开口并且有可能呈现在制品表面上的第二层3b。由于卫生和与多层制品22的功能相关的原因,优选地,层3b不位于与被包装产品相接触的制品侧面。
本发明并不限于如图21所示的具有三层的物料。具有更多的层更有优势,特别是为了改善层间的粘着性能。在这点上,图21中所示的功能层3可以是多个平行层的集合体。例如,该功能层本身可以包括3层,其中阻隔树脂层位于两个粘着树脂层之间。
图23a-23d说明了制备图21所示的多层物料的方法。该方法包括模压多层物料,其特征在于将树脂连续输入到传递模塑器19的可变腔中,腔的体积会随着输进所述腔中的树脂的量而变化。接着将这些物料以熔融态的形式转移到压缩模具中来制备多层制品。图23a为树脂输入前的传递模塑器19。缸20a、活塞20b和盖21组成了传递模塑器19,并且具有腔,该腔具有一个由孔22形成的开口。在树脂输入前,先将腔的体积减少。该方法包括首先输入形成物料外层的树脂2。图23b为通过孔22输入了树脂2,这就引起了活塞20的移动,并且引起了传递模具19中腔体积的增加,该增加与所输入的树脂体积成比例。该方法包括接着将功能树脂3输进传递模具19中。图23c为树脂3的输入并且显示了在模具中树脂3已经延伸到树脂2中。该方法最后包括形成物料内层的树脂4的输入。图23d说明了树脂4的输入以及随着活塞20的移动,同时还说明了该树脂4在功能层3中的扩散。
接着将多层树脂以熔融态从传递模具中转移到压缩模具中。图24a-24c简要说明了该转移方法。图24a说明了该方法的第一步骤,包括与多层物料底面相接触的盖21的分离或开启。接着该物料如图24b所示,通过活塞20b被挤出传递模具19。图24c图示了在模压器23的腔中的多层物料。
在传递到模压器23的过程中,多层物料必须处于熔融态,从而可以进行模压并能防止表面缺陷。因此控制传递模具19的温度以及物料在传递模具中的停留时间就变得十分重要。对组成传递模具19的部件的温度的调整,既要使得物料可以脱模,又要能在物料表面形成足够薄的表层从而使得物料在压缩前能够重新熔融。传递模具的温度必须尽可能的高以接近熔融树脂的温度并且在模具中的停留时间必须尽可能的短。
除了图24的方法,把多层物料放入压膜器也可以使用别的方法。例如,在垂直于对称轴上的缸20a上开个侧口,则有利于物料的挤出。
图25a-25c说明了多层物料的压缩。图25a显示了物料在模具23的腔中的位置。图25b说明了用于压缩物料的活塞24的下落以及形成多层制品。图25c为制备而成的多层制品。
图26中图示了用被模制的物料来制备多层制品的装置。该装置包括含有模具的第一转盘25,用于压缩物料的设备以及用于排出被模压制品的设备。该装置还包括含有传递模具19的第二转盘,用于将树脂连续输入进传递模具的设备,当树脂被输到所述模具时,用于增加传递模具的腔的体积的设备还包括将物料转移进压缩模具中的设备。传递模具和压缩模具的轨迹线相接触点影响了物料的转移。此外,装置还可以包括使转盘旋转的设备和调整及控制参数的设备。
在图27中描述了传递转盘26。该旋转转盘带动了传递模具19。在转盘26旋转的过程中,模具19连续经过了第一物料通道28、第二物料通道29和第三物料通道30。所述进料通道28、29和30是固定的,并且与挤出器相连。当传递模具19与一个通道相连时,在压力下进入到通道中的树脂会填充所述模具的腔。图27说明了连续经过通道28、29和30的模具会连续地被来自各自通道的树脂所填充。因此,通过将树脂2、3和4分别输入到通道28、29和30中,可以制备出与图21相同的物料。可以通过通道28、29和30各自的长度L1、L2和L3以及每个树脂的输入压力来调整进入传递模具19的腔中的不同树脂各自的量。
根据本发明制备的制品具有特别优异的阻隔性能。可以作出的部分解释,根据本发明所制备的大部分制品具有足以覆盖制品表面的功能层,并且,尤为特别的是,该表面区域接近制品的对称轴。
本发明范围内所用的树脂与当前所用热塑性树脂相同,并且尤其是用于包装品工业的树脂。可以用于形成功能层3的阻隔树脂在此引用的是乙烯乙烯醇共聚物(EVOH),聚酰胺如尼龙一MXD6、丙烯晴一甲基丙烯酸共聚物(BAREX),氟化高聚物如PVDF。在此也列出了一些是用于形成物料层2和4的树脂:聚乙烯(PE)、聚丙烯(PP)、聚苯乙烯(PS)、聚胺(PA)、聚酯(PET)。上述列举并非穷举。对于树脂的挑选,重要的是挑选具有邻近粘度的产品。通常,优选采用的树脂在工作温度下的粘度比低于10,优选粘度比低于3。
本发明同样涉及了含有多个功能层的多层物料,所述功能层被单独的包裹在一树脂中,该树脂占了至少80%所述物料的体积。根据本发明,至少一个功能层相对于对称轴具有可变的距离。包含有多个功能层的物料在高生产速度下具有优势。实际上,在非常高的速度下,流速很难发生大的变化。第二功能层可以是以物料对称轴为中心的管状形状,在物料中该层的径向位置可以使得该层压缩所制备出的多层制品具有两个独立的功能层,设置使得部分一个在另一个的上方并能具有与连续层类似的性质。同样第二功能层相对于对称轴也具有可变的距离。在另一特别的实施例中,该物料具有平行的两个功能层。
本发明尤其用于制备如压片或塞子的制品
在此所列举的实施例中,物料和制品都是简单形状,但是本发明显然涉及任何形状的物料和制品。
根据本发明所制得的制品含有功能层3,在制品的外周上该功能层至少形成了一个折。也可以制备含有第二个折的制品,该折接近制品对称轴。还可以使得制品中的功能层是锯齿状排列的。
本发明已经描述了物料中分布的单功能层3。同样也可以使用含有多个功能层3的物料,所述功能层均以所述物料对称轴为中心。所制备的多层制品,其特征在于功能层间的设置,使得至少部分一个在另一个的上方,并且分布贯通于制品。
可以使用其它的物料形状。就观察所得,部分表面内凹的物料具有特别的优点。此类物料形状有助于功能层在多层制品中的分布。
食品应用中包装物或包装物元件的制备要求良好的卫生性能。因此经常要求功能层3不直接与被包装的产品相接触。将功能层3整个的包裹在物料中是有利的,这样所述功能层就被完全的包裹在制品中了
可以作为选择的,阻隔层的一端有可能不被包裹。
Claims (8)
1、一个用于模压法制备多层制品的具有对称轴的多层物料,其由第一合成树脂和一个被包裹在所述第一树脂中的功能细层3组成,所述层3小于物料体积的20%,该多层物料的特征在于,层3形成了对称轴旋转体的壳体,并且该层到对称轴的距离可以变化。
2、一种如权利要求1所述的物料,其特征在于(Rmin-R0)/(Rmax-R0)小于0.8,Rmax和Rmin分别是功能层与对称轴之间的最大和最小距离,R0是以对称轴为中心的小孔的半径,R0的值符合下述关系:0≤R0<Rmin。
3、一种如前面任意一项权利要求所述的物料,其特征在于功能层本身是多层结构,其包括被两个粘着树脂层所包裹的一个阻隔层。
4、一种如前面任意一项权利要求所述的物料,其含有多个功能层。
5、一种模压具有对称轴的多层物料而制得的多层制品,所述物料由第一合成树脂和一个被包裹在所述第一树脂中的功能细层3组成,所述层3小于物料体积的20%,该多层物料的特征在于,层3形成了对称轴旋转体的壳体,并且该层到对称轴的距离可以变化。
6、一种生产如权利要求1-4任意一项所述轴对称多层物料的方法,包括在熔融态下共挤多层树脂杆或管,接着在熔融态下周期性切削所述的杆或所述的管,该方法的特征在于至少一层的流速是周期性变化的,流速的周期等于切削周期。
7、一种如权利要求6所述的工艺,其特征在于两层流速以位相相反的方式作周期性变化。
8、一种生产如权利要求1-4任意一项所述轴对称多层物料的方法,包括连续将至少两种树脂以熔融态注射入模具的腔中,接着以熔融态将物料从所述模具的腔中排出,并且腔的体积变化与所注射入的树脂体积成比例。
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