CN100519158C - 皮带结构物的制造方法 - Google Patents
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Abstract
本发明披露一种方法,使用由固体热塑性树脂包覆纤维性基质所制成的带来制造造纸皮带结构物。本发明方法包括:将横机器方向(CD)取向的带所构成的层体施加于基座表面,然后将机器方向(MD)取向的带所构成的层体施加于该横机器方向(CD)层体上,对包含横机器方向(CD)层体及机器方向(MD)层体的基座施加压力及热,以使树脂熔融并粘结/裹覆该纤维性基质。然后,可对如此制成的皮带结构物进行开槽、钻孔、或其它所需的处理。此外,上述方法可颠倒机器方向(MD)层体/横机器方向(CD)的叠层顺序。还有,可施加整体皆由树脂所构成的层体,较佳地,在施加该机器方向(MD)/横机器方向(CD)层体之前施加,然而也可在之后施加,或者在之间施加。同时,橡胶可构成一层或数层。
Description
技术领域
本发明涉及一种使用预浸渍带来制造造纸皮带结构物的方法。更具体地说,该带包含独特的热塑性树脂及纤维性基质。
背景技术
造纸过程中,在造纸机成形部,通过将纤维浆沉积到移动的成形织物上形成纤维素纤维网,纤维浆也就是纤维素纤维的水分散体。浆体中大量的水通过成形织物排出,而纤维素纤维网则留在成形织物的表面上。
刚形成的纤维素纤维网从成形部进入压榨部,压榨部包括一系列压榨压区。纤维素纤维网被压榨织物支撑,或者通常情况下位于两层这样的压榨织物之间,穿过压榨压区。在压榨压区中,纤维素纤维网受到压缩力的作用,该压缩力将水从网中挤出,并使网中的纤维素纤维彼此粘附,使得纤维素纤维网转变为纸幅。水由该一层压榨织物或多层压榨织物所吸收,并且理想的情况是不回到纸幅中去。
纸幅最终进入干燥部,干燥部包括至少一个可转动的干燥转鼓系列或烘筒系列,这些转鼓或烘筒由蒸汽在内部进行加热。干燥织物将纸幅紧贴在转鼓的表面,并引导刚形成的纸幅以弯曲路径依次绕行该系列中的每个转鼓。加热的转鼓通过蒸发作用将纸幅的含水量降低到所需水平。
应该了解的是,成形织物、压榨织物及干燥织物在造纸机上都采取无端环(endless loop)的形式,并且都起到传送带的作用。应该进一步了解的是,纸张生产是一种以相当快的速度进行的连续过程。也就是说,在成形部,纤维浆连续地沉积到成形织物上,而刚生产出的纸张在离开干燥部后就被连续地卷绕到辊筒上。
通常,压榨部包括一系列由邻近的圆柱形压榨辊对形成的压区。近年来,人们发现使用长压区压榨机优于使用由成对的邻近压榨辊形成的压区。这是因为纤维素纤维网在压区中承受压力的时间越长,从其中除去的水分就越多,以及因此,残留在纸幅中需要在干燥部中通过蒸发作用除去的水分就越少。
本发明涉及靴型长压区压榨机。在此类型的长压区压榨机中,圆柱状压榨辊和弓形压榨靴形物之间形成压区。压榨靴形物具有圆柱状的凹表面,其曲率半径接近于圆柱状压榨辊的曲率半径。当辊和靴形物彼此紧密地物理相邻时,形成压区,其沿机器方向的长度可比两个压榨辊之间形成的压区的长度长5至10倍。在每平方英寸维持足够挤压力等级下,纤维素纤维网在长压区内受压的所谓停留时间长。因此在造纸机上,与使用常规压榨压区相比,这种长压区技术得到的效果是,在长压区内纤维素纤维网的脱水量大幅度提高。
靴形长压区压榨机需要特殊的带,如Dutt共同转让的美国专利5,238,537中所示的皮带。这种皮带设计成保护这些用来支撑、运送及脱去纤维素纤维网中水分的压榨织物不受加速磨损,该磨损由在固定的压榨靴形物上进行的直接滑动接触产生。这种皮带必须设有平顺的不渗透表面,该表面在油润滑膜上越过或滑过固定的压榨靴形物。皮带以与压榨织物大致相同的速度移过压区,从而向压榨织物施加的对皮带表面摩擦量最小。
传统制造长压区压榨带的方法涉及使用纱线及液体树脂系统。具体地,已知有3种方法可使用这些材料来制造皮带。第一种方法是使用双辊系统,其中用液体聚氨酯涂覆环形织造基材。第二种方法是使用制造基座,在该基座外表面上,以基本上彼此成90度夹角的阵列来叠置补强纱线,然后用液体聚氨酯树脂完全裹覆。第三种方法类似于第二种方法,二者的差异在于使用基座内表面来放置纱线,然后倾倒树脂来形成皮带。
使用上述3种方法,用于补强结构的纱线可是单丝、或复丝,并定位于树脂内以保护纱线完整性。由于补强纱线相对大的尺寸以及裹覆纱线所需的树脂材料量,因此皮带的厚度将不可避免地增厚。特别是在带凹槽及盲孔皮带的情况下,会需要加工凹槽及孔洞的附加树脂厚度。
本发明通过使用预浸渍带来制造皮带,从而解决此问题。带包含以类似丝带的形式并排放置的单独纤维丝,然后用热塑性树脂来裹覆及加以保护(参见图1)。热塑性浸渍纤维丝的使用使得树脂补强组件能置入皮带结构,而基本不增加皮带厚度。这种单独纤维丝小于由制造常规皮带的纤维束组成的纱线。此“预浸渍”带是本发明的建构组件。
发明内容
本发明是这样一种方法,通过提供均用固体热塑性树脂包覆纤维性基质所制成的单独的带,来制造造纸皮带结构物。本发明方法的一个实例包括:将横机器方向(CD)取向的带构成的层体施加于基座表面,然后将机器方向(MD)取向的带构成的层体施加于该横机器方向(CD)层体上,对包含横机器方向(CD)层体及机器方向(MD)层体的基座施加压力及热,以使热塑性树脂熔融并粘结/裹覆该纤维性基质。之后,如此制成的皮带结构物可进行开槽、钻凿、或其它所需的处理。
可选择地,上述方法可颠倒机器方向(MD)层体与横机器方向(CD)层体的叠层顺序。还有,在施加机器方向(MD)及横机器方向(CD)带之前,较佳地,将整体皆由树脂构成的层体预先施加于基座。此外,在施加机器方向(MD)带及施加横机器方向(CD)带之后,或在其间,可施加一层或数层树脂层。此一层或数层树脂层可以是橡胶。
附图说明
因此通过本发明,将实现本发明的目的及优点,下面将结合附图进行描述说明,其中:
图1是用以制造根据本发明皮带的纤维补强热塑性带的示意性代表图;
图2是用于制造本发明皮带的建构基座的图示;
图3示出图2基座,图1的带在横机器方向施加于其上;以及
图4是示出图3基座的代表图,更多的带在机器方向施加于其上。
具体实施方式
图1示出用于制造本发明皮带的纤维补强热塑性带10。带10包含特定的固体热塑性弹性体树脂12,树脂12包含可经辐射活化交联的化合物。树脂12包覆可呈多种型态的纤维性基质14。基质材料14的实例包括具有长纤补强丝线的长纤维丝、织造带及针织带。然而,如图1所示,由于长纤维丝14并不依靠树脂粘结来获得强度,因此,长纤维丝14可提供最佳的补强效能。即,当树脂12因为某些原因失去其完整性时,纤维丝14仍可提供补强效能。
为了形成带10,可用特别的热塑性弹性体树脂12对任一种上述基质材料14进行浸渍,例如:通过加热模具。完成时,被称为“预浸材”10呈固体形态,并具有固定的横剖面。如图2-4所示,使用此预浸材10,在建构基座16上放置具有机器方向(MD)及横机器方向(CD)带22、24的阵列。然后,用织造带或可收缩薄膜(未示出)包覆包含机器方向(MD)及横机器方向(CD)预浸材带22、24阵列的基座16,以在后续加热处理期间提供压力。此加热处理使热塑性树脂12再度液化,藉此产生所有机器方向(MD)及横机器方向(CD)纱线14的均匀树脂裹覆。一旦包含均匀树脂及纱线补强物的基座16冷却,受损区域可用加热工具进行再度熔融,来修补任何一种瑕疵(例如:气泡)。在任何瑕疵已修补之后,可用适合的方式处理树脂12,以使树脂12交联,形成热固材料。然后,如此制成的皮带结构物表面可进行机械加工,藉此制造具有所需厚度及间隔的凸块及凹槽、或盲钻孔、或其它方法,以制造所需的表面空隙。
现在将更详细地描述一个制造皮带的上述方法实例。开始时,如图3所示,首先在全部基座表面上横机器方向(CD)放置带22,然后在基座16两侧用夹钳环18、20进行固定就位。在此种连接方式中,必须小心确定相邻的带22彼此邻接并且之间没有空隙。在横机器方向(CD)预浸材带22覆盖整个基座16表面之后,螺旋缠绕机器方向(MD)带24,同样,必须确定相邻的螺旋彼此邻接,如图4所示。注意,在开始缠绕及结束缠绕时,此机器方向(MD)带24都必须紧固于夹钳环18、20。
应理解,机器方向(MD)/横机器方向(CD)叠层的顺序是可以颠倒的。此外,较佳地,在施加带22、24之前,施加全部都是树脂的层。更进一步必须注意的是,在制造凹槽或盲钻孔空隙体积需要皮带较厚的情况下,可以在预浸机器方向(MD)及横机器方向(CD)带22、24就位之前或之后,施加100%以热塑性树脂制成的带(未示出)。此树脂层也可施加于尚未完全固化的机器方向(MD)/横机器方向(CD)层体之间。根据需要,可施加数层非纤维补强的热塑性树脂层。一层或所有层此种树脂层可以是橡胶。
以预浸材带22、24“铺叠”基座16之后,可准备进行加热处理,以熔融热塑性树脂12以及粘结整个基质。然而,在加热处理之前,用可收缩薄膜来包覆铺叠的基座16,该薄膜可保持所有的组件并向其提供压力。然后,被包覆的基座(未示出)置入高压釜或类似的加热腔室。然而,可使用用于此目的的加热、红外线、热空气、或其它适合的方法,使树脂12熔融流动,而不用将整个基座置入热空气环境。注意,使树脂12流动所需的热,由用于制造预浸材10的树脂12类型决定。
在充分加热树脂12以促进树脂流动之后,可以藉由使皮带冷却来使树脂12固化。接着,由于树脂12的热塑特性,可藉由加热及另加的树脂(未示出)来修补树脂粘结区域的缺陷,例如小孔隙。然后,可使用例如常规打磨设备,将如此制成的皮带结构物的表面打磨至均一厚度。然后,根据需要可形成凹槽或盲钻孔。
额外地,必须注意的是,还有热固性树脂族,这些热固性树脂在高于其熔点温度时会进行交联而热固。制造皮带也可使用此种类型的树脂,并且这种类型的树脂是较佳材料。
本发明与美国专利5,507,899(Yamauchi)所披露内容有关键性差异。例如,Yamauchi专利的带在还处于液体形态时缠绕基座,并且仅缠绕机器方向,而没有横机器方向组件。该专利的缺点是,如果纤维与树脂的粘结被破坏,会在所有方向都丧失补强效用。本发明籍由使用带10来减小此缺点,本发明带10呈固体状态(干态),并且既放置于机器方向(MD)也放置于横机器方向(CD),以使稳定性最佳。此外,由于如图1所示的长丝14不是依靠粘结树脂来获得其强度的,因此长丝14可提供优良的补强效能。即,如果树脂因为某些原因失去完整性时,丝14仍可提供补强效能。
虽然本发明披露并详细说明了优选实施例,但本发明范围并不受限于此;相反地,本发明范围应有所附权利要求决定。例如,本领域的技术人员可将本发明皮带用作轧光机或其它应用中的靴型压榨带。
Claims (16)
1.一种用于制造皮带结构物的方法,所述方法包括下列步骤:
提供用树脂包覆纤维性基质制成的带;
在基座表面施加CD取向的带;
在所述CD带上,施加MD取向的带;
对包含CD及MD带的基座加压并加热,以使所述树脂熔融并裹覆所述纤维性基质;
处理所述如此制成的皮带结构物,以使其固化;以及
将所述皮带结构物的至少一表面打磨至所需厚度。
2.根据权利要求1所述的方法,其中所述树脂是热塑性树脂,并且在皮带结构物的处理步骤期间,热固化所述树脂。
3.根据权利要求1所述的方法,进一步包括在所述皮带结构物的表面形成凹槽或盲钻孔的步骤。
4.根据权利要求1所述的方法,其中通过使可收缩薄膜包覆包含CD及MD带的所述基座,施加压力。
5.根据权利要求1所述的方法,其中所述树脂是包含辐射活化交联化合物的固体热塑性弹性体树脂。
6.根据权利要求1所述的方法,其中施加辐射能量,以热固化所述树脂。
7.根据权利要求1所述的方法,进一步包括,在加热步骤之后,冷却树脂裹覆的所述基质以固化所述树脂的步骤。
8.根据权利要求1所述的方法,其中部分或所有的带包含橡胶。
9.根据权利要求1所述的方法,进一步包括修补所述皮带结构物的瑕疵的步骤。
10.根据权利要求1所述的方法,其中所述纤维性基质可提供补强效能,以及,所述纤维性基质条包含以长纤补强丝线构成的长纤维丝、织造带、及针织带之一。
11.根据权利要求1所述的方法,其中以螺旋方式施加所述MD带。
12.根据权利要求1所述的方法,其中所述MD与CD带的层叠顺序是颠倒的。
13.根据权利要求1所述的方法,其中在施加所述MD与CD带之前,在所述基座表面施加至少一层树脂层。
14.根据权利要求1所述的方法,其中,在所述带就位之后,至少一层树脂层施加于所述MD与CD带上。
15.根据权利要求1所述的方法,其中至少一层树脂层施加于尚未完全固化的所述MD与CD带之间。
16.根据权利要求1所述的方法,其中所述皮带结构物用作靴型轧光机中的靴型压榨带。
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US10/612,230 | 2003-07-02 | ||
US10/612,230 US7011731B2 (en) | 2003-07-02 | 2003-07-02 | Long nip press belt made from thermoplastic resin-impregnated fibers |
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CN1816441A CN1816441A (zh) | 2006-08-09 |
CN100519158C true CN100519158C (zh) | 2009-07-29 |
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US (1) | US7011731B2 (zh) |
EP (1) | EP1638763B1 (zh) |
JP (1) | JP4624349B2 (zh) |
KR (1) | KR101075455B1 (zh) |
CN (1) | CN100519158C (zh) |
AT (1) | ATE397523T1 (zh) |
AU (1) | AU2004256069A1 (zh) |
BR (1) | BRPI0412266A (zh) |
CA (1) | CA2530435C (zh) |
DE (1) | DE602004014273D1 (zh) |
ES (1) | ES2307034T3 (zh) |
MX (1) | MXPA05014231A (zh) |
NO (1) | NO20060533L (zh) |
NZ (1) | NZ544401A (zh) |
RU (1) | RU2352703C2 (zh) |
TW (1) | TWI323219B (zh) |
WO (1) | WO2005005131A1 (zh) |
ZA (1) | ZA200600057B (zh) |
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- 2003-07-02 US US10/612,230 patent/US7011731B2/en not_active Expired - Lifetime
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2004
- 2004-06-23 AT AT04755895T patent/ATE397523T1/de active
- 2004-06-23 ZA ZA200600057A patent/ZA200600057B/en unknown
- 2004-06-23 BR BRPI0412266 patent/BRPI0412266A/pt active Search and Examination
- 2004-06-23 ES ES04755895T patent/ES2307034T3/es active Active
- 2004-06-23 KR KR1020057025519A patent/KR101075455B1/ko active IP Right Grant
- 2004-06-23 MX MXPA05014231A patent/MXPA05014231A/es active IP Right Grant
- 2004-06-23 DE DE200460014273 patent/DE602004014273D1/de active Active
- 2004-06-23 AU AU2004256069A patent/AU2004256069A1/en not_active Abandoned
- 2004-06-23 NZ NZ544401A patent/NZ544401A/en unknown
- 2004-06-23 CN CNB2004800186950A patent/CN100519158C/zh not_active Expired - Fee Related
- 2004-06-23 CA CA2530435A patent/CA2530435C/en not_active Expired - Fee Related
- 2004-06-23 EP EP20040755895 patent/EP1638763B1/en not_active Not-in-force
- 2004-06-23 RU RU2006101215A patent/RU2352703C2/ru not_active IP Right Cessation
- 2004-06-23 WO PCT/US2004/020022 patent/WO2005005131A1/en active Application Filing
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Also Published As
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WO2005005131A1 (en) | 2005-01-20 |
EP1638763B1 (en) | 2008-06-04 |
JP2007527331A (ja) | 2007-09-27 |
NZ544401A (en) | 2008-11-28 |
TW200518918A (en) | 2005-06-16 |
BRPI0412266A (pt) | 2006-09-05 |
TWI323219B (en) | 2010-04-11 |
KR101075455B1 (ko) | 2011-10-24 |
NO20060533L (no) | 2006-02-01 |
KR20060025208A (ko) | 2006-03-20 |
AU2004256069A1 (en) | 2005-01-20 |
RU2352703C2 (ru) | 2009-04-20 |
MXPA05014231A (es) | 2006-07-03 |
US20050003177A1 (en) | 2005-01-06 |
US7011731B2 (en) | 2006-03-14 |
JP4624349B2 (ja) | 2011-02-02 |
EP1638763A1 (en) | 2006-03-29 |
DE602004014273D1 (de) | 2008-07-17 |
CA2530435A1 (en) | 2005-01-20 |
ZA200600057B (en) | 2007-04-25 |
ES2307034T3 (es) | 2008-11-16 |
CA2530435C (en) | 2011-02-22 |
RU2006101215A (ru) | 2006-07-27 |
ATE397523T1 (de) | 2008-06-15 |
CN1816441A (zh) | 2006-08-09 |
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