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2013-09-23 09:36:08
<p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><br></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"> 打纬机构的主要作用是将引入梭口的纬纱推向织口,使之与经纱紧密交织形成织物。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 二、打纬机构的类型</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 目前各类无梭织机上使用的打纬机构主要有三种类型:连杆打纬机构、凸轮打纬机构和筘片打纬机构。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 1.连杆打纬机构</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 连杆打纬机构是利用杆件把织机主轴的回转运动转变为钢筘的往复打纬运动。应用最多的是四连杆打纬机构,也有在四连杆基础上发展的六连杆打纬机构。此外为了适应某些织物品种,还有一些特殊的多连杆打纬机构。这里主要介绍四连杆打纬机构。四连杆打纬机构结构简单、制造方便,在无梭织机上有着广泛的应用。<br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></span></p><section align="center" class="" style="max-inline-size: 100%; margin: 0px; padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><img src="http://dayaotex-img.gz.bcebos.com/article/fffspic/wszj1012.png" _src="http://dayaotex-img.gz.bcebos.com/article/fffspic/wszj1012.png" data-ratio="1.8113207547169812" data-w="212" style="margin: 0px; padding: 0px; max-width: 100%; max-inline-size: 100%; overflow-wrap: break-word !important; outline: none 0px !important; height: auto !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p></section><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"> 图1-13为一某无梭织机的四连杆打纬机构的运动简图。A为主轴,AB为曲柄,BC为连杆(牵手),D为摇轴,它们共同构成一曲柄摇杆机构。四连杆打纬机构的运动特性可用C点的运动来表示。如果连杆BC两极端位置连线C<sub style="max-inline-size: 100%; margin: 0px; padding: 0px; font-size: 12px; overflow-wrap: break-word !important; outline: none 0px !important;">1</sub> C<sub style="max-inline-size: 100%; margin: 0px; padding: 0px; font-size: 12px; overflow-wrap: break-word !important; outline: none 0px !important;">2</sub> 的延长线通过主轴中心,则称为轴向打纬机构;否则称为非轴向打纬机构。主轴中心偏离C<sub style="max-inline-size: 100%; margin: 0px; padding: 0px; font-size: 12px; overflow-wrap: break-word !important; outline: none 0px !important;">1</sub> C<sub style="max-inline-size: 100%; margin: 0px; padding: 0px; font-size: 12px; overflow-wrap: break-word !important; outline: none 0px !important;">2</sub> 线的程度e,称为非轴向偏度。主轴中心A若位于C<sub style="max-inline-size: 100%; margin: 0px; padding: 0px; font-size: 12px; overflow-wrap: break-word !important; outline: none 0px !important;">1</sub> C<sub style="max-inline-size: 100%; margin: 0px; padding: 0px; font-size: 12px; overflow-wrap: break-word !important; outline: none 0px !important;">2</sub> 线的上方,则e为正值,其后止点位置小于180°;反之,为负值,后止点位置大于180°。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 曲柄AB与连杆BC的比值L/R和非轴向偏度e的大小,都影响C点的运动,也就是影响钢筘的运动。其中以比值L/R的影响为主。按照比值L/R的大小,打纬机构可分为长牵手打纬机构、中牵手打纬机构和短牵手打纬机构。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 一般来说,L/R>6称为长牵手打纬机构;L/R=3~6称为中牵手打纬机构;L/R<3称为短牵手打纬机构。按照连杆机构运动分析方法,可得出C点的运动规律。连杆BC越短,当曲柄处于前死心(0°)附近时,钢筘的运动速度就越快,加速度也越大,有利于打纬,此外,短牵手打纬机构允许载纬器(主要是剑杆)通过梭口的主轴转角较大,钢筘在后方相对停留时间较长,载纬器有充裕的时间通过整个梭口,所以,短牵手打纬机构适宜于宽幅、厚重织物的织造,如喷气织机上,L/R<2,牵手相当短。但是,牵手越短,钢筘运动的加速度变化就越大,加剧了织机的振动,不利于高速,一般配以轻筘座加以弥补,以适应高速,减少振动。中、长牵手打纬机构则多用于轻型、窄幅的织机上。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 2.凸轮打纬机构</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 凸轮打纬机构是利用凸轮、转子等部件将主轴的运动传递给钢筘完成打纬动作。无梭织机的凸轮打纬机构一般都是分离筘座,采用共轭凸轮机构,其打纬推程和回程由主、副两个凸轮分别控制,凸轮的轮廓曲线完全可以根据筘座的运动需要来设计,可以有相当长的筘座静止时间供载纬器穿越梭口,这些特点适合与无梭引纬相配合的打纬机构的要求,因而成为现代无梭织机上应用最广泛的一种打纬机构,片梭、剑杆、喷气、喷水等各类型织机均有应用。<br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></span></p><section align="center" class="" style="max-inline-size: 100%; margin: 0px; padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><img src="http://dayaotex-img.gz.bcebos.com/article/fffspic/wszj1013.png" _src="http://dayaotex-img.gz.bcebos.com/article/fffspic/wszj1013.png" data-ratio="1.6528925619834711" data-w="242" style="margin: 0px; padding: 0px; max-width: 100%; max-inline-size: 100%; overflow-wrap: break-word !important; outline: none 0px !important; height: auto !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p></section><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"> 如图1-14所示,打纬共轭凸轮装在左右凸轮箱内,当主轴1回转时,主凸轮2推动滚子4,使得筘座9以摇轴6为中心逆时针摆动,带动钢筘8打纬。打纬完毕后,副凸轮3推动滚子11,使筘座顺时针摆动。当安装在筘座上的走剑板与固定机架上的左右剑带导轨处于平齐时,筘座便静止下来,以利于引纬运动。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 共轭凸轮打纬机构有以下特点:</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> (1)筘座及钢筘在引纬时可静止不动,引纬机构和筘座就可分离,适应高速。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> (2)筘座能较长时间地静止在梭口后方,为高速、宽幅创造了有利条件,同时又充分利用了梭口高度,减小了打纬动程。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> (3)凸轮、转子和摆臂封闭在箱体内,能实现油浴润滑,在运动副之间所形成的油膜还可以缓和打纬时引起的转子和凸轮之间的冲击,并可使多个凸轮箱同步工作。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> (4)凸轮的加工及装配精度要求很高,凸轮、转子间的共轭精度应控制在0.02~0.03mm之间,凸轮打纬机构的成本较高。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> (5)打纬凸轮的载荷较大,其压力角不宜大,一般应小于30°,以减小冲击磨损,副凸轮的压力角可以适当放宽。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 总的来说凸轮打纬机构的特点,是筘座的运动时间短,静止时间长,加速度大,机构易振动。从降低振动的角度考虑,筘座的动程是以小为好,但当载纬器的尺寸一定时,筘座动程小,则开口动程就会加大,而且前后综的动程差异也大,这就加大了经纱张力的差异,造成易断经,且使织口上下跳动,故筘座动程也不能太小,需根据引纬方式、车速、织造工艺等综合确定。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 另一方面,根据各种织物的工艺特点,在满足工艺需要的前提下,设计、选择合适的筘座运动规律就显得特别重要。筘座运动规律应满足下面几点:</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> (1)筘座从静止到运动、从运动到静止时其加速度应逐渐变化,不能有突变。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> (2)打纬时刻筘座的加速度的大小应保证筘座的惯性力大于打纬阻力。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> (3)其余时间内,加速度曲线应连续,变化要缓和,峰值要小。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 对于上述几点来说,单用一种运动曲线方程式是不能同时满足所有要求的。常采用两种或三种曲线来组合。较常用的一种是正弦和余弦加速度组合曲线,另一种是改进型梯形加速度曲线。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 3.筘片打纬机构</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"> 连杆打纬机构和凸轮打纬机构均存在筘座的往复运动,其运动稳定性较差,为适应高速及多梭口织机等的要求,出现了圆筘片打纬机构。它取消了筘座的往复运动,而用旋转的多角形筘片直接将纬纱推入织口,如图1-15所示。<br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></span></p><section align="center" class="" style="max-inline-size: 100%; margin: 0px; padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><img src="http://dayaotex-img.gz.bcebos.com/article/fffspic/wszj1014.png" _src="http://dayaotex-img.gz.bcebos.com/article/fffspic/wszj1014.png" data-ratio="0.9713114754098361" data-w="244" style="margin: 0px; padding: 0px; cursor: pointer; max-width: 100%; max-inline-size: 100%; overflow-wrap: break-word !important; outline: none 0px !important; height: auto !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p></section><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"> 在主轴1上排列着多角形的筘片2,经纱3和4嵌在相邻筘片之间的缝隙中,筘片随主轴回转时,其打纬半径就将纬纱5推向织口。其传动机构简单,运转平稳,适宜于高速运转,但异型筘片制作成本高。</span></p><section class="_135editor" data-role="paragraph" style="max-inline-size: 100%; margin: 0px; padding: 0px; border: 0px none; z-index: 0; overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; font-family: 微软雅黑, "Microsoft YaHei", sans-serif; font-size: 17px; caret-color: rgb(255, 0, 0); overflow-wrap: break-word !important; outline: none 0px !important;"></p></section><section class="_135editor" data-role="paragraph" id="autoparagraph" style="max-inline-size: 100%; margin: 0px; padding: 0px; border: 0px none; z-index: 0; overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; font-family: 微软雅黑, "Microsoft YaHei", sans-serif; font-size: 17px; caret-color: rgb(255, 0, 0); overflow-wrap: break-word !important; outline: none 0px !important;"></p></section>