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ZONED STRETCHING OF A WEB.

机译:Web的区域拉伸。

摘要

There is provided an apparatus and methods for stretching one or more zones (26, 27) of a web and webs including one or There is provided an apparatus and methods for stretching one or more zones of a web and webs including one or more stretched zones. Each of the stretched zones in the web is stretched in the cross-web direction, i.e., the direction (c, d) transverse to the downweb direction (m, b). The stretching can be performed continuously on the web as the web is advancing through the apparatus in the down-web direction. The method for stretching an extensible web in the cross direction generally is practiced on a substantially continuous cross-directional extensible web. The web is traveling in a first downweb direction at a first speed. The extensible web has a width and substantially continuous length in the first downweb direction. The crossweb stretching occurs in an orientation zone (26, 27) established between at least two moving nip points (28, 29, 30). The nip points are in a plane of the web with a leading nip (28) downweb of a trailing nip (29, 30) with the at least two nips offset in the cross direction. The leading nip moves at a faster speed than the trailing nip, where the degree of crossweb orientation in the orientation zone is proportional at least to a ratio of the leading nip speed to the trailing nip speed.
机译:提供一种用于拉伸纤维网的一个或多个区域(26、27)和包括一个或多个的网的设备和方法。提供一种用于拉伸纤维网的一个或多个区域和包括一个或多个拉伸区域的设备和方法。 。纤网中的每个拉伸区域均在横向纤网方向即横向于下纤网方向(m,b)的方向(c,d)上拉伸。当纤网沿下纤网方向前进通过设备时,可以在纤网上连续进行拉伸。在横向上拉伸可拉伸纤维网的方法通常在基本上连续的横向可拉伸纤维网上实施。纤网以第一速度沿第一下行纤网方向行进。可伸长的幅材在第一幅材向下的方向上具有宽度和基本连续的长度。幅材的拉伸发生在至少两个移动的夹持点(28、29、30)之间建立的定向区(26、27)中。压区点在纸幅的平面中,后压区(29、30)的前压区(28)向下幅材,其中至少两个压区在横向方向上偏移。前压区的移动速度比后压区的移动速度快,后者在定向区域中的交叉幅材取向程度至少与前压区速度与后压区速度的比率成比例。

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