CN1926027B - 多层结构 - Google Patents
多层结构 Download PDFInfo
- Publication number
- CN1926027B CN1926027B CN2005800067265A CN200580006726A CN1926027B CN 1926027 B CN1926027 B CN 1926027B CN 2005800067265 A CN2005800067265 A CN 2005800067265A CN 200580006726 A CN200580006726 A CN 200580006726A CN 1926027 B CN1926027 B CN 1926027B
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- CN
- China
- Prior art keywords
- resin
- layer
- article
- barrier
- potion
- 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.)
- Expired - Fee Related
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Images
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Abstract
一种合成树脂多层结构(1),其边界由一顶面(2)、边界(3,5)以及一底面(4)构成,其中底面的面积基本等于顶面(2)的面积,所述结构(1)包括:一第一层(6),其形成所述表面(2,4)以及所述边界(3,5);一第二层(7),其布置在所述表面(2,4)以及所述边界(3,5)之间,其面积至少等于所述表面(2,4)的面积,其特征在于第二层(7)至少形成一个Z字形双折(8,9)。
Description
技术领域
本发明涉及由塑料材料制成的多层物品的领域,其特别但非限定地涉及包装特别是柔性管头和塞子的领域。
背景技术
美国专利US4876052公开了一种多层物品(参见图1),其特征在于第一合成树脂7完全封闭在第二合成树脂6中。这种多层物品是由一剂复合物料经压模获得的,其中第一树脂完全封闭在第二树脂中。美国专利文献US4876052中公开的多层结构特别适用于像容器或盖子这样的物品上。然而,这种用来获取这些多层物品的方法中有许多的困难。第一树脂完全封闭在第二树脂中的复合物料的生产要求将第一树脂断断续续地挤到第二树脂中。如美国专利US4876052所述,其中有一共挤设备,该设备具有一个用于第一种合成树脂的切断阀机构,其用来控制所述第一树脂的断续流动。然而,这些切断阀机构非常复杂并费力,同时还不能对断续流实现精确的、可重复的以及方便地控制。还有,由于其生产设备的成本很高,因此美国专利US4876052中多层物品的实现成本也相对较高。
为了消除美国专利US4876052的缺点,日本专利JP2098415提出由一剂复合物料通过压模来实现多层物品,其特征在于第二合成树脂仅覆盖住第一合成树脂的侧面。沿着该剂物料的对称轴线压模制出一种具有多层结构的物品(图2),其特征在于第一树脂6部分封装在第二树脂7中。然而,根据日本专利JP2098415由两种树脂得到的多层物品具有两个明显的缺点:第一,曝露于物品中心表面上的阻挡树脂7超过了物体总表面的5%;第二,物品中所需阻挡树脂7的数量至少要占到总树脂量的30%。由此生产出的物品一方面价格过高,另一方面机械性能特别是物品中心的机械性能变化很大。日本专利JP2098415的另一个缺点是树脂6和7各自的数量不好调节,它们的量均由物品的几何结构以及该剂物料压模过程中的流动来固定。
在专利JP2098415中,提出使用一剂三层物料从而部分地消除前述的缺点。该剂物料包括:第一树脂11,其形成该剂物料的中心部分,第二树脂7,其仅用来覆盖第一树脂的侧面;以及第三树脂6,其仅用来覆盖第二树脂的侧面。沿着该剂物料的对称轴线挤压该复合物料就得到一多层物品(参见图3)。三层物料的使用具有能够减少阻挡树脂7用量的优点,同时相对于内含一种树脂6的物品来说还能制造出机械性能稍有改变的物品。然而,第二树脂7并不覆盖多层物品的中心部分,其生产出的物品在靠近对称轴线的地方没有阻挡特性。物品上未被阻挡树脂层7覆盖的中心区域会消弱物品的阻挡性能,并使这种解决方案缺乏有效性。
发明内容
为了消除专利US4876052和JP2098415的缺点,本发明提出一种多层物品以及通过压模来制造该多层物品的方法。该物品的特征在于具有一种独特的多层结构,其不同于现有技术,能使所述物品具有特别优秀的阻挡特性。
附图说明
通过下面附图所示示例的说明,能够更好地理解本发明。其中:
图1是现有技术专利US4876052的多层物品。该多层物品包含一阻挡树脂层7,其完全包裹在树脂6中从而形成该物品。
图2是现有技术专利JP2098415的多层物品。该多层物品包含一阻挡树脂7,其部分包裹在树脂6中从而形成该物品。在该物品中心部分的表面上能够看到该树脂7。
图3是现有技术专利JP2098415的多层物品。该多层物品包含一阻挡树脂层7,其包裹在树脂6和11之间从而形成该物品。该阻挡树脂层7并不延伸到物品的中心部分中。
图4所示为本发明的一种多层物品。该物品包含一阻挡树脂层7,其形成一Z字形并穿过该物品。阻挡树脂层7封闭或部分封闭在树脂层6中。
图6所示为本发明的一种包含有孔10的多层物品。该物品的特征在于一阻挡树脂层7,其形成一Z字形并从物品的周壁3到孔壁5穿过该物品。
图7所示为形成Z字形的中间层可由多个层12、7和12’构成。一般来讲,层12和12’为粘性树脂层,其能使形成阻挡层的树脂7与树脂6结合在一起形成这种结构的物品。
图8和9所示的树脂层7至少包含一个Z字形。图8所示为一种可用在管肩上的树脂层7的几何结构。
图10所示为根据本发明实现的一种管肩以及该物品中阻挡树脂层7的分布情形的例子。
图11到15所示为被用来通过模压来制造多层物品的一剂物料。
图11所示为现有技术中一剂用来实现专利US4876052中多层物品的物料。该剂物料的特征在于阻挡树脂7完全封闭在树脂6中。
图12所示为现有技术JP2098415中描述的一剂物料。该剂物料包括一阻挡树脂7,其侧面被第二树脂6所包裹。
图13所示为现有技术JP2098415中描述的一剂多层物料。该剂物料包括三层,其中阻挡层7在侧面封闭在树脂层6和7之间。
图14所示为本发明所用一剂管形多层物料。该剂物料包括一中心孔、一内层6’、一中间层7以及一外层6。其中阻挡树脂层7的端部13和13’并未完全包裹在树脂6和6’中。
图15所示为一剂具有孔的多层物料。该剂物料包括5层,其中两层为粘性树脂12和12’,其在阻挡树脂层7和树脂层6和6’之间形成一种结合。
图16到18所示为第一种用来制造本发明多层物品的方法。
图16所示为一剂物料在压制设备中的定位,其中该剂物料包含3层即6、7和6’,其中的压制设备包括一顶板14、一底板15和一活塞16。
图17所示为该剂物料在压制过程中的变形情况。
图18所示为所述该剂物料经压制得到多层物品的情况。
图19到22所示为第二种用来制造本发明多层物品的方法,其从一剂圆柱形的多层物料开始。
图19所示为该剂物料在一压制设备中的定位,其中该剂物料包含3层即6、7和6’,其中的压制设备包括一顶板14、一底板15和一活塞16。
图20所示为压制过程的第一阶段,其中在活塞16和底板15之间压制该剂物料的中心部分。
图21所示为压制过程的第二阶段。该剂物料在板14和15之间经压制使树脂流向周壁,同时活塞16的上移生成一个上升的空隙,并使树脂向中心流动。
图22所示为压制之后所获得的多层物品。
图23到26所示为一种通用的用来控制该剂物料分别或同时朝中心或周壁变形的方法。该过程展示的是由一剂带孔物料得到不带孔物品的生产。
图23所示为该剂物料在压模中初始定位。
图24所示为使该剂物料朝中心变形从而填满空腔18的方法。
图25所示为填满周围空腔17的方法。
图26所示为该剂物料经压制后所形成的仍在模具中的物品。
图27到30所示为生产一种带孔物品的方法。
图27所示为该剂物料在压模中的定位。
图28所示为使该剂物料朝中心变形从而填满空腔18并形成物品中孔的方法。
图29所示为该剂物料在周围空腔17中流动的情况。
图30所示为在压制结束时功能树脂层7在物品中的布置。
图31和32所示为物品的一种特别优选的几何结构,其能使用一种简化的压制设备。该模压后的物品在其中心部有一个轴向突起。
图31所示为将一剂由树脂层6、7和6’构成的管形物料送入到顶模14和底模15之间情况。
图32所示为该剂物料的压制以及阻挡树脂层7在流动过程中的变形。树脂层7夹在其中一起流向周壁和中心。
图33到35所示为一种方法,其可用来控制双层功能树脂7厚度方向上的位置。该方法能使所述双层树脂7靠近物品的顶壁和底壁。
图33所示为本方法流动的第一步。此时该剂物料沿方向A流动。
图34所示为第二步,其中双层树脂7因底板15和环19之间空隙的上升而朝着物品的底壁流动和偏移。
图35所示为在模制之后双层7在物品厚度方向上的偏移。
图36到38所示为功能层57在该剂物料中的位置与该剂物料几何结构之间的关系。
具体实施方式
图4的剖示图所示为本发明一例多层物品。该物品1具有一顶面2、一底面4以及一边界3。第一树脂5形成了所述物品的顶面和底面以及边界。第二树脂7形成了一个布置在物品顶面和底面之间的层,并穿过该物品。所述所述树脂层7至少有两个折,其中第一个折靠近边界3,第二个折靠近物品的对称轴线。形成了一Z字形双折的所述树脂层7具有两个自由端,第一个自由端靠近顶面2,第二自由端靠近底面4。树脂层7的端头可以与物品的表面齐平,也可完全封闭在物品中,这取决于工艺参数。
图6的剖示图所示为本发明的第二例多层物品。该物品具有一开孔10、一顶面2、一底面4以及边界3和5。在这种多层物品中,阻挡树脂层7至少形成两个折,其中第一个折靠近物品外周的边界3,第二个折靠近用来形成开孔的边界5。在这种内含一个开孔的物品中,其特征在于被封闭的层7在布置上形成了一个“Z”字形几何结构,并且层7的自由端靠近物品的顶面2和底面4。
在本发明的物品中,阻挡树脂层7的厚度精确规则并且能够调节。通常来讲,阻挡树脂层的厚度小于100微米就足够了,但该厚度优选小于50微米。阻挡树脂层7的厚度可根据所需的阻挡特性和所用的树脂来控制和调节。
一般来讲阻挡树脂层7和形成物品的树脂6之间没有粘性。特别是在阻挡树脂为EVOH树脂并且形成物品的树脂6属于聚烯烃族(PE、PP)时更是如此。在某些情况下,这种较差的粘性不会对所述物品的使用和整体性能带来不利的影响。然而,如果必须要有一些粘性来确保所述物品的机械性能和阻挡性能,那么第一种解决方案就是在树脂6中加入粘性剂并使之混合到树脂6中。第二种解决方案是像常规的多层结构那样在阻挡层的一侧加上粘性层。在图7所展示的一种多层物品中,阻挡层7的两侧各有一层粘性树脂12和12’,其封闭在形成物品的树脂6中。这些多层结构特别好用。
本发明的物品并不限于阻挡树脂层7具有两个折的多层结构。图8所示为本发明的另一种物品,其包含一个形成有三个折的阻挡树脂层7,这三个折分别标记为8、9和9’。同样,图9所示的物品中阻挡层7形成有五个折,其分别标记为8、8’、9、9’、9”。这些示例不是排它性的。
本发明的物品具有特别优秀的阻挡特性。这可部分解释为本发明物品的主要部分至少具有一个双阻挡层。这种双重保护在层体局部受损时能提供更好性能以及一定的安全性。
本发明所使用的树脂对应于当前使用的热塑性树脂,特别是那些用于包装工业中的热塑性树脂。其中的阻挡树脂可以是所述的乙烯与乙烯基乙醇的共聚物(EVOH)、聚酰胺如尼龙-MXD6(Nylon-MXD6)、丙烯腈丙烯酸甲酯的共聚物(BAREX)、氟化聚合物如PVDF。这里也可用一些现有的树脂来形成物品的本体6:聚乙烯(PE)、聚丙烯(PP)、聚苯乙烯(PS)、聚酰胺(PA)、聚酯(PET)。上述物质列表是非排它性的。在树脂的选择中,重要的是选择具有毗邻粘性的产品。一般来讲,优选使用这种在工作温度时粘性比小于10的树脂,其粘性比优选为小于3。
第一种用来实现本发明多层物品的方法包括以下步骤,第一,挤出一剂管形几何结构的多层物料;第二,在一模具中对该剂物料进行压模从而使物品成型。图14所示为一剂三层物料,其可用来实现图4、6、8和9中所示的多层物品。在该剂物料中,阻挡材料7的侧面包覆在两树脂层6和6’之间。通常来讲,阻挡层7的顶端13和底端13’未被包覆。该方法用在本发明中使阻挡树脂层在该剂物料的压制过程中充分利用流动机理特别是粘性梯度来移动。我们通常认为在靠近模具的地方流动的粘性要弱于流动的中心。通过流动粘性的这些不同并通过合适的压制方法来控制这些机理,就能使所述阻挡层(7)展开,并由此控制所述层(7)在模制出的物品中的最终位置。优选采用一剂管形物料,因为这种结构有于阻挡层(7)在该部件中包括周围部分和中心部分中展开。实际上,当在一合适的设备中沿着该剂物料的对称轴线压制时,所述该剂物料的管形结构能使材料朝物品的对称轴方向和物品的周围流动。树脂的这种流动使阻挡层7产生移动。朝周围方向的流动会夹带着阻挡层7移到物品的外边界,同时朝向中心的流动在物品不带有开孔时会夹带着阻挡层7移到物品的对称轴,在物品带有开孔时则会夹带着阻挡层7移到边界处。本发明多层物品的实现需要该剂物料的几何结构(内径、外径、高度、每层物料的量以及压制的参数)达到最优。
在本专利的大多数示例中,出于描述清楚的考虑,只选用其中仅包含有三层树脂的物料。图15所示为一剂包括有五层的物料。形成层12和12’的树脂通常是粘性的树脂从而分别粘贴到功能树脂层7和用来形成物品本体结构的树脂层6和6’上。图7所示为一例由上述五层物料获得的物品。
图16到18所示为第一种用来实现一多层物品的方法的一个示例。根据该方法,一剂管形结构的多层物料先沉积在一模具中(图16)。该剂物料包含一阻挡树脂7,其部分包裹在树脂6和6’之间。压制设备由一顶板14、一底板15和一活塞16表示。在初始位置下,活塞16和底板15之间的距离小于顶板14和底板15之间的距离。图17所示设备的各个部分14、15和16之间该剂物料压制的开始状态。该剂物料逐渐填满空腔17和18,该剂物料在空腔17中的流动会夹带着阻挡树脂层7朝周围移动,同时该剂物料在空腔18中的流动会夹带着阻挡树脂层7朝中心移动。图18所示为阻挡层17在该剂物料压制结束时的分布情况。该剂物料在空腔17中的流动使层7延伸出物品的外周,同时该剂物料在空腔18中的流动夹带着层7移到物品的对称轴。其它的设备也可用来将一剂管形物料做成多层物品。这些设备的共同点在于它们都能使该剂物料朝着外周和中心流动。根据所选设备的不同以及控制顺序的不同,这些流动可以同时进行,也可按顺序进行。通常来讲必须使空腔18中的空气排放出去。可用排气口或者其它现有的方式来实现空气的排放。这种由一剂管形物料做出多层物品的方法特别适用于带孔物品的实现。该实现方法类似于图16到18所示的方法,只是模具的几何结构要有所变化。
第二种用来实现本发明多层物品的方法是用一剂杆形物料开始的。该第二种方法包括以下步骤:用力使该剂物料流向物品的中心和外周,朝着外周的流动会夹带着阻挡树脂层朝物品的端部移动,同时该剂物料朝着中心的流动会夹带着阻挡树脂层朝物品的中心移动。本发明重点在于夹带阻挡树脂层朝物品中心的移动,因为对于杆形的物料来说,这种流动很难形成。本方法还包括:进行一次挤压,然后将物品的中心部分松开从而将阻挡树脂层7吸入到中心部分中。
图19到22所示为第二种用来实现本发明多层物品方法的一个示例。其从一剂圆柱形的多层物料开始。图19所示为送入一剂柱形的多层物料,其包括:一个用来形成中心部分的第一树脂6’,一个用来形成中间层的阻挡树脂7以及一个用来形成该剂物料外层的树脂6。该剂物料定位于一压制设备中,该设备包括一顶板14、一底板15和一活塞16。图20所示为活塞20的落下,其压缩该剂物料的中心部分并使树脂6’朝外周流动。活塞16和底板15的相对运动必须能使空腔18中形成的空隙小于物品的最终厚度。这种压缩运动使阻挡树脂层7朝物品的外周变形。图21所示为下一步,其涉及该剂物料的压缩。顶板14和底板15的相对运动使该剂物料在空腔17中流动。这种流动夹带着阻挡层7朝物品的外周移动。与此同时,活塞16向上移动,从而使空腔18中的空隙增加。活塞16和底板15之间的这种相对移动使该剂物料朝物品的中心流动。这种流动夹带着阻挡树脂层7朝中心移动。图22所示该剂物料经压制之后阻挡树脂层7的分布情况。该剂物料在空腔17中的流动夹带着层7移到物品的外周,同时该剂物料在空腔18中的流动夹带着层7移到物品的对称轴。其它的设备也可用来将一剂柱形的多层物料做成多层物品。这些设备的共同点在于它们都能使该剂物料朝着外周和中心流动,其中朝向中心的流动由压缩-松开运动来实现,
第一种压制一剂带有一孔的多层物料从而做出一多层物品的方法,以及第二种压制一剂柱形物料的方法可根据所用的压制设备以及压制过程中的运动而分成各种的压模方法。这些方法的特征在于在控制条件下使该剂物料按顺序或同时朝着模具的外周或中心流动。图23到26所示为一种精确控制该剂物料朝中心或周壁流动的方法。该方法能够藉着防止朝向外周的流动而形成朝向中心的流动;或者反过来,藉着防止朝向中心的流动而形成朝向外周的流动;其还能使流动朝两个方向同时进行。图23到26所示为一种控制方法。图23所示为该剂物料在一设备中的定位,其中的设备包括一顶板14、一底板15、一活塞16以及一环19。该剂物料包括树脂层6、7和6’。图24所示为如何减少底板15和环19之间空腔17的空隙从而使该剂物料朝中心流动的。环19和底板15之间的相对位置能够使流动仅在空腔18中形成,或者是同时在空腔17和18中形成。图25所示为该剂物料借助于环19和底板15之间空隙的增加而在空腔17中流动的情况。图26所示阻挡树脂层7在模制结束时的分布情况。根据所选压制方法的不同,这些流动的复杂性可多可少,树脂在压制过程中也可能来来回回。这些复杂的流动用来形成阻挡树脂层7的最终分布情况,这种分布情况例如图9所示的情况描述起来多少都有些困难。
前述的方法也能实现带孔的物品。然而,对于此类物品来说,优选使用第一种方法,其特征是由一剂管形的多层物料开始。图27到30所示为生产一种带孔部分的示例。图27中所示模制设备与图23所示设备完全相同,只是多了一个孔杆20。图16中的设备同样可加上一个孔杆20。图27所示为管形多层物料在设备中的定位。图28所示为如何压缩顶板14和底板15之间的物料并限制其在环19和底板15之间流动从而使该剂物料在空腔18中变形。这种限制能够使物料按顺序或同时在空腔18和17中流动。另有一种控制方法,其特征是对活塞16和顶板14之间的该剂物料进行限制使该剂物料在空腔17中变形,然后再填满空腔18。图29所示为该剂物料在空腔17中的变形。图30所示为在压制结束时不同树脂的分布情况。设备不同部分的控制顺序取决于物品的几何形状、树脂的流变性、该剂物料的几何形状。通常必须用反复设置的方法来使阻挡树脂层7处于物品中的正确位置处。
充分利用压制过程中物品的几何特性就能用一种简化的压制设备来实现多层物品,其能使树脂朝着物品的中心及外周恬当地流动。这些物品通常在中心具有一个轴对称的突起。图31和32就是一例。图31所示为将一剂由树脂层6、7和6’构成的管形物料送入到设备中的情况,其中的设备包括一顶模14和一底模15。图32所示为该剂物料在所述模具的空腔中被挤压的情况。阻挡树脂7夹在其中一起流向物品的外周和中心。
该工艺通常用来生产内含一双阻挡层7的多层物品,其中的双阻挡层定位于物品厚度相对中间的位置上并对称布置,只是在所述阻挡层7的端头其更靠近物品的表面。对于某些物品来说,最好令阻挡层7离物品的顶面和底面更近一些。图33到35所示为一种控制双层阻挡树脂7在物品厚度中的位置的方法。图33所示为该剂物料在顶板14和底板15之间进行压制的过程中沿方向A的变形。环19和底板15之间空隙变小。图34所示为该方法的第二步,其特征是环19和底板15之间空隙增加,同时该剂物料继续在顶板14和底板15之间压缩,并沿方向A流动。此时可以看到双层7会偏向底板15。图35所示为双阻挡层7在该方法结束时的位置。此时该双阻挡层偏向模制的物品的底面。
物品的几何结构、物料的几何结构、树脂的流变性以及本发明多层物品的模制方法之间存在复杂的关系。图36到38所示为不同物料在压制前定位于同一模具15中的情况。该剂物料由三层构成,其分别标记为6、7和6’。层7是一个功能树脂层。图36到38所示为生产同一物品但直径不同的物料。其中需要注意的是功能树脂层7在物料中的位置随着物料直径的变化而变化。在图36中,该剂物料的直径很小,同时功能树脂层7靠近所述该剂物料的开孔,而在图38中,该剂物料很大同时功能树脂层7靠近所述物料的外周面。功能树脂层7在该剂物料中的位置取决于所述物料分别朝物品中心及外周的流动距离。如果朝中心的流动距离小于朝外周的流动距离,那么功能层7就靠近该剂物料的对称轴(图36),反之,如果朝中心的流动距离大于朝外周的流动距离,那么功能层7就靠近所述该剂物料的外周面(图38)。在流动的距离基本相等时,功能层就位于所述该剂物料基本对称的位置上(图37)。为了清楚起见,将流动的长度选作一个参数,但如果为了更加准确地将所述层7定位在该剂物料中,那么就必须依赖于材料的体积,而不是流动的距离。
也可用其它的方法来生产本发明的多层物品。增加空腔的体积增加,其通常被称为冒口,可用来补偿过程控制的不准确性并有助于定位。接下来将这些冒口从物品上拆下来还能重复利用。该冒口可用来制造非轴对称的物品。
另一种方法是通过增加或减小模具中的气压来促进朝向中心或外周的流动。
在这里所示的示例中,物料和物品均具有简单的几何结构,但本发明显然也适用于任易几何结构的物料和物品。
阻挡层7在物料中可以有多种布置。本发明最好采用一种特定布置的阻挡层7,所述布置的特征是阻挡层7用来形成一个中心处于对称轴上的旋转体的壳体。当阻挡层7到对称轴的距离可变时,模制方法可以有所简化。
本发明前面是用物料中一种简单的阻挡层7来进行的描述。其中物料也可包括多个阻挡层7,该阻挡层的中心均处于所述物料的对称轴上。由此获得的多层物品的特征在于其中有一个阻挡层至少部分地布置在另一个阻挡层上,并至少形成一个Z字形的双折。
本发明也可采用其它结构的物料。显然,物料的部分表面内凹会更好一些。这种物料的几何结构有助于阻挡层更好分布于多层物品中。
食品领域中的包装或者是包装部件均要求良好的卫生条件。因此,阻挡层以及粘性层最好不要与被包装的产品直接接触。最好是将阻挡层和粘性层完全包裹在物料中,这样所述阻挡层和粘性层就完全包裹在物品中。
作为选择,阻挡层可以有一端不被包裹。
Claims (9)
1.一种合成树脂多层结构(1),其表面由一顶面(2)、边界(3,5)以及一底面(4)构成,其中底面的面积等于顶面(2)的面积,所述结构(1)包括:
一个第一层(6),其形成所述顶面(2),底面(4)以及边界(3,5);
一个第二层(7),其布置在所述顶面(2),底面(4)以及边界(3,5)之间,其面积至少等于所述顶面(2)或底面(4)的面积,
其特征在于第二层(7)至少形成一个Z字形双折(8,9),所述Z字形双折具有两个自由端,其中一个自由端在顶面(2)与该结构的外侧接触,同时另一个自由端在底面(4)与该结构的外侧接触。
2.如权利要求1的多层结构(1),其具有一对称轴。
3.如权利要求1的多层结构(1),其包含一个穿过所述结构的中心孔。
4.如权利要求3的多层结构(1),其特征在于所述多层结构形成一个管肩。
5.如权利要求1-4任意一个的多层结构(1),其特征在于第二层(7)自身形成一多层结构,其包括一层阻挡树脂,该阻挡树脂层包裹在两粘性树脂层之间。
6.一种对一剂由融化树脂构成的多层物料进行压模从而生产出一合成树脂多层结构的方法,其包括以下步骤:连续或断续地挤出一剂热塑性树脂多层物料,该物料至少包含一层功能树脂;在设备中压制所述该剂物料从而获得该多层结构,该压制过程的特征在于有一部分功能树脂被夹带着朝外周移动而另一部分朝中心移动,通过所述方法在该多层结构中形成的这种功能树脂至少形成有一个Z字形双折,所述Z字形双折具有两个自由端,其中一个自由端在该结构的顶面与该结构的外侧接触,同时另一个自由端在该结构的底面与该结构的外侧接触。
7.如权利要求6的方法,其采用一剂带有开孔的物料。
8.如权利要求6的方法,其采用一剂实心的物料。
9.如权利要求6的方法,其包括:局部进行压制,然后松开从而使功能树脂朝中心流动。
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