CN1327102A - 用于造纸机的箍压带 - Google Patents

用于造纸机的箍压带 Download PDF

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CN1327102A
CN1327102A CN01119449A CN01119449A CN1327102A CN 1327102 A CN1327102 A CN 1327102A CN 01119449 A CN01119449 A CN 01119449A CN 01119449 A CN01119449 A CN 01119449A CN 1327102 A CN1327102 A CN 1327102A
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W·贝斯特
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Abstract

本发明涉及一种箍压带(1),该箍压带用于造纸机的箍压设备中。箍压带具有支承带(2)和不可渗透液体的带层(3,5),这种不可渗透液体的带层又分为内层(3)和外层(5),而且外层具有多孔结构,这种多孔结构是仅由朝外开放的孔穴(8,12,14)形成的,箍压带的特征在于,外层(5)是由未发泡的材料制成的。

Description

用于造纸机的箍压带
本发明涉及一种箍压带,该箍压带用于造纸机的箍压设备中,它具有一个支承带和一个不可渗透液体的带层,不可渗透液体的带层又分为一个内层和与其相邻接的一个外层,外层具有多孔结构,该多孔结构是由仅向外开口的孔穴形成的。
这样一类箍压带能从US 4 701 368的图6和图7中清楚可见。它有一个不可渗透液体的带层,该带层由不可渗透液体的内层和与其邻接的外层这两层构成。在此一个示例实施方案中,附加的支承带是用纺织品做成的。而在另一个示例实施方案中,内层同时具有支承带的作用并因此构成支承带。直接与纸面相接触的外层可用闭孔或开孔泡沫材料制成。对于具有开孔的外层,纸面的脱水通过该外层进行,所以可以放弃箍压带。
已知的箍压带有以下不足之处,在箍压机的高压下,箍压带的外层实际上是被完全压缩了,因为该外层只由泡沫材料的单薄的小泡壁构成。至少对开孔形式而言,所希望的脱水是不足够的或根本不可能。
在US 4 552 620中描述了箍压带,该箍压带是由一个纺织品支承带和单面或双面涂层的带层构成。通常该涂层了的带层具有互不相连的有限数目的固定孔穴。孔穴直径为0.019至0.185mm,而且孔穴应在与纸面装置相连接的带层外侧生成石质结构。该结构应使纸面在箍压后与箍压带分开变得容易一些。
上述箍压带有以下不足之处,由于带层在整个横截面上所分布的孔穴非常具有伸缩性,所以箍压区非常容易被压在一起,结果导致孔穴也被压缩了。这样孔穴就起不到改善纸面的脱水作用,进而也就使得箍压带不能起到应有的功能。
因此本发明的目的是,提供一种在引言中所说的箍压带,这种箍压带的特点在于箍压区具有抗压能力,因此就能保证纸面的有效脱水。
按照本发明,这个目的如此达到,外层由一种未发泡的材料制成,优选由一种塑性材料来制做外层,但只有向外侧开口的孔穴存在,此外带层是均匀的,所以此箍压带能满足各种特定的要求,例如硬度,弹性模量等。已经发现,这样制成的箍压带能使得纸面有效脱水,任选由一根共同使用的压带协助。
内层有利地做成不可渗透液体的构造,使得其能具有纵向弹性的和/或压缩弹性的构造。首先应使支承带具有小于等于500CN/tex的特征模数。对于内层材料特别适用的为PBT,PES,PA6.6,PA6.10,PA6.12,PA11,PA12和PTT,这些材料也能结合使用。
对于用于造纸机上所有带子而言,支承带要保证箍压带的结构强度。在此目的,支承带可由丝线构成,例如以纺织品,针织品或者丝线层的形式存在。但是相当结实的纤维网也是适用的,例如被浸渍过的或被压制过的纤维网形式;若可能的话,这些支承带形式应具有均匀的厚度。在施加了涂层的一边,表面应是光滑的,例如打磨使其光滑。为了在支承带与涂层之间形成牢固的接合,如果把支承带至少部分地嵌入涂层是有好处的,完全嵌入也是可行的。
天然橡胶或弹性物适用于作为内层材料。硅酮弹性体、聚酯弹性体或聚氨基甲酸酯类尤其适用于作为内层材料。内层的硬度应优选在80至95 Shore A之间。
为了使内层硬度适中,可以添加无机填充颗粒,例如二氧化钛或陶土。如果内层厚度最大公差不超过100μm,那么内层能起较好的作用。为了达到这样的厚度公差,在施加外层前可以进行适当的机械处理或打磨。
外层材料首选的是聚氨基甲酸酯类和/或硅酮弹性体或聚酯弹性体。当应用了这些或其他的塑性材料时,孔穴就能以众所周知的方式产生,即将可溶性颗粒撒在外层材料上且嵌入其中,这些粒子能通过一种外层能耐受的溶剂而溶解(参见EP-A 0 786 550)。为此,水溶性盐类如氯化钠,氯化钾和/或碳酸钙的颗粒是特别适用的。颗粒的直径应在10μm至1500μm,最好在400μm至1000μm之间。这些颗粒的直径以随机的方式分布,以产生适当尺寸的孔穴。
为了增强外层的耐磨性,建议在外层表面履盖一层纳米级粒子层。这些纳米粒子在此以前在化学上用作产生彩色效果的颜料、化妆品和数据存储层,其粒子直径在纳米级,它们能保护外层不易于磨损,尤其是当纳米粒子由例如二氧化硅或金属材料制成的、且几乎形成一个连续的外层时更是如此。纳米粒子能作为溶胶涂履在外层上,然后溶剂(多为乙醇)蒸发掉。纳米粒子局部地与氟碳链结合,以使外层的表面区域具有疏水性,由此而使得纸面与箍压条分离变得容易。
外层的另一种生成方法是应用电子辐射硬化的预聚合物乳液。硅酮或聚氨基甲酸酯类尤其适用于此法。硅酮或聚氨基甲酸酯类在一种水—表面活性剂混合液中乳化,该乳液通过电子辐射硬化法而把混合液蒸发掉。
此外根据本发明,外层的外侧还可包括这些材料,它们形成有不同的亲水性或疏水性的区域。两种材料都旨在使纸面易于从箍压带揭下。以亲水性和疏水性区分的区域和之间的差异应按下面的方式安排和构成,以使纸面在箍压带提举的区域内总能保证有足够的附着力。
箍压带有利地具有80 Shore A至95 Shore A之间的硬度和±50μm的厚度公差。
此外根据本发明,在外层和内层之间还可安置一层,该层的硬度如外层。
最后,根据所提出的发明,整个箍压带有±100μm的厚度公差。
参考附图中的图示实施方案,更进一步说明了本发明。
图1为用于造纸机的箍压带的部分纵向剖面图。
图2为图1箍压带的外层的第一个实施方案的纵向剖面图。
图3为图1箍压带的外层的第二个实施方案的纵向剖面图。
图4为图1箍压带的外层的第三个实施方案的纵向剖面图。
在图1中可看到,箍压带1有一个支承带2,此处,支承带是用聚酰胺丝线的纺织物制成。支承带2上侧为内层3,下侧为基层4,支承带2嵌入3,4两层之内。内层3和基层4由硅酮弹性体制成。
在内层3上面有一个外层5,外层5具有多孔结构和光滑的表面6。表面6用来接触纸面,而基层4的下侧在造纸机器的轧棍上通过。
在图2的实施方案中,外层5主要包含一个浇铸的聚氨基甲酸脂层7。为了在聚氨基甲酸脂层7中产生向外开放的孔穴(例如用8所示),在制成层7以前,将盐颗粒(例如用9所示)均匀分散在聚氨基甲酸脂类材料中,所加入的颗粒大小分布从10μm至1500μm不等。在内层上形成聚氨基甲酸脂层7之后,那些没有被聚氨基甲酸脂层7完全包裹着的那些颗粒、即与外侧保持连通的颗粒9用水洗出。这样就形成了孔穴8,其深度与以前嵌入的盐类颗粒深度相一致,且有朝外侧开放的开口。那些深入到离表面6有一定距离的盐颗粒9未被溶解出,所以还在聚氨基甲酸脂类层7里面。
孔穴8打破了表面6的完整性,但是在开孔缝隙之间,表面6还是保持在一个层面上,且互相连接起来和是光滑的。这样使纸面有一个大的接触面,相应地就提供一个高的附着力。由于孔8在经过箍压后发生膨胀,孔穴8产生一个反压力,它有助于纸面附着在表面6上。
在图3所示的外层5的示例实施方案,原料也是聚氨基甲酸脂。然而此处的这种材料是以粉末的形式被施加熔结的,这样就生成了一个具有光滑表面11的聚氨基甲酸脂层10。盐颗粒被加入到聚氨基甲酸脂粉末中(这点参见EP-A 0 786 550所描述的方法),然后这些盐颗粒通过一个水洗过程而全部被溶解,这样产生多孔结构,生成具有向外开放的孔穴(例如标记为12)。聚氨基甲酸脂层10的作用与图2中所述的聚氨基甲酸脂层7的相同。
图4示例描述了一个外层5,该外层是由预聚合物的乳液制成的。该乳液被涂履到内层3上,然后用电子束硬化。这样就形成了各个互相联接着的聚合物颗粒(例如标以13示),在这些颗粒之间就形成了孔穴(例如标以14所示)。这几方面总体上导致也能形成具有比较光滑的表面15的多孔结构。

Claims (22)

1.用于造纸机的箍压设备中的箍压带,具有一个支承带(2)和一个不可渗透液体的带层(3,5),它有一个内层(3)和一个外层(5),外层具有多孔结构,该多孔结构仅由向外开放的孔穴(8,12,14)构成,其特征在于,外层(8,12,14)是由一种未发泡的材料制成的。
2.根据权利要求1的箍压带,其特征在于,内层(3)是不渗透液体的。
3.根据权利要求1或2的箍压带,其特征在于,内层(3)具有纵向弹性的和/或压力弹性构造。
4.根据权利要求1至3之一的箍压带,其特征在于,支承带(2)沿纵向有一个小于等于500CN/tex的特征模数。
5.根据权利要求1至4之一的箍压带,其特征在于,支承带(2)是一种纺织品,针织品,丝线层或纤维网或这几种物品的结合。
6.根据权利要求1至5之一的箍压带,其特征在于,支承带(2)至少部分地嵌入内层(3,5)中。
7.根据权利要求1至6之一的箍压带,其特征在于,内层(3)是由天然橡胶或弹性体、尤其是硅酮弹性体、聚氨基甲酸酯和/或聚酯弹性体制成。
8.根据权利要求1至7之一的箍压带,其特征在于,内层(3)的硬度在80至95 Shore A之间。
9.根据权利要求1至8之一的箍压带,其特征在于,内层包括无机物填充颗粒。
10.根据权利要求1至9之一的箍压带,其特征在于,内层(3)的厚度最大公差为100μm。
11.根据权利要求1至10之一的箍压带,其特征在于,外层(5)是由聚氨基甲酸酯和/或硅酮弹性体和/或聚酯弹性体制成。
12.根据权利要求1至11之一的箍压带,其特征在于,在外层(5)中的孔穴(8,12,14)的平均直径为10μm至1500μm。
13.根据权利要求1至12之一的箍压带,其特征在于,在外层(5)的表面有纳米级粒子,这些纳米级粒子形成一个部分连续的层。
14.根据权利要求13的箍压带,其特征在于,纳米级粒子至少部分地是由二氧化硅制成的。
15.根据权利要求13或14的箍压带,其特征在于,纳米级粒子包括氟碳链。
16.根据权利要求1至10之一的箍压带,其特征在于,外层(5)是由电子束硬化过的预聚合物乳液制成的。
17.根据权利要求1至16之一的箍压带,其特征在于,外层(5)的外侧面包括这样的材料,它们形成具有不同疏水性或亲水性的区域。
18.根据权利要求1至17之一的箍压带,其特征在于,外层(5)的厚度为3mm,内层(3)的厚度为1—3mm。
19.根据权利要求1至18之一的箍压带,其特征在于,外层(5)的硬度在80 Shore A至95 Shore A之间。
20.根据权利要求1至19之一的箍压带,其特征在于,外层的厚度公差为±50μm。
21.根据权利要求1至20之一的箍压带,其特征在于,在外层(5)和内层(3)之间又安置了另一层,该层比外层(5)硬一些。
22.根据权利要求1至21之一的箍压带,其特征在于,箍压带(1)的整体厚度公差为±100μm。
CNB011194499A 2000-06-06 2001-06-05 用于造纸机的压榨设备中的压榨带 Expired - Fee Related CN1159494C (zh)

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KR20010110357A (ko) 2001-12-13
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EP1162307A3 (de) 2002-05-15
KR100468202B1 (ko) 2005-01-26
EP1162307A2 (de) 2001-12-12
CA2347570A1 (en) 2001-12-06
ID30419A (id) 2001-12-06
AR028129A1 (es) 2003-04-23
EP1162307B1 (de) 2003-11-12
CN1159494C (zh) 2004-07-28
US20020060052A1 (en) 2002-05-23
DE50100938D1 (de) 2003-12-18
ZA200104578B (en) 2001-12-12
ATE254209T1 (de) 2003-11-15

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