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The paper/cardboard web drying station has an initial blower dryer with a large pick-up suction roller to transfer the web from the final press nip to a large support roller
The paper/cardboard web drying station has an initial blower dryer with a large pick-up suction roller to transfer the web from the final press nip to a large support roller
The web drying station (10), at a machine for the prodn. of a paper or cardboard web (12), has an especially large suction pick-up roller (20) between the final press nip (14) of the water-extraction press section (16) and the following blower drying unit (18). The web (12) is detached from the blanket (22), which carries the web (12) through the press section (16), or a transfer belt, and transfers the web to the drying unit (18). The suction pick-up roller (20) has an outer dia. of 1.2-2.5 m, and has a mesh belt (24) passing around it. The pick-up roller is cladded with a mesh stocking, and has an internal suction box, or its suction is from an external suction box at its mantle. Or the suction pick-up roller (20) has a suction box divided into a number of zones. The blower drying unit (18) has an especially large support roller (26), or the like, with blower dryers (28). The web (12) is transferred to the support roller (26) by the pick-up roller (20). The assembly can also have a further large support roller with associated dryers. The support rollers (26) have an outer dia. of 2.5-8.0 m and pref. 3-5 m. A mesh belt (30) passes round the support roller (26), which is a suction roller or a cylinder. A support belt passing over a number of support rollers can replace the support roller (26), with its support rollers deployed on a circular arc. The drying unit (18) has at least one hood (28), which is positioned and/or covers the arc segment ( alpha ) of the roller covered by the web to give a min. gap between the large support roller (26) and the final press nip (14). Where there are two support rollers, the web is transferred from the mesh belt (30) at the first roller (26) to the large support roller of the following drying unit. The support rollers can be deployed so that each roller is against a different side of the web, with the first drying unit (18) acting on the upper side of the web (12) and the next drying unit working the under side of the web, or vice versa. The drying unit (18) is between the final press nip (14) of the press section (16) of the machine and the first multiple cylinder group (40), with a one-piece hood (28) and a further drying unit with a multiple-piece and pref. two-part hood. The drying units (18) are set to raise the dry material content of the web to 55-65%. The drying units (18) have a preceding or integrated infra red heater. With a machine speed where the web travels at 70-120 m/sec. and pref. 80-100 m/sec., the drying units (18) are operated at a temp. of 250-450 deg C and pref. 250-350 deg C. The hoods (28) have jet holes with a dia. of 10 mm and/or suction slits with an open jet surface of 1.5-3.5% pref. covered by hole diaphragms against clogging. A sensor to register a web break is before and/or after the drying units (18) or between them.
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机译：纸幅干燥站（10），位于用于产品的机器上。纸幅或纸板幅（12）的纸幅在抽水压榨部（16）的最终压榨压区（14）和随后的鼓风机干燥单元（18）之间具有特别大的吸取辊（20）。纸幅（12）与橡皮布（22）分离，橡皮布（22）通过加压部（16）或传送带运送纸幅（12），并将纸幅传送至干燥单元（18）。吸纸辊（20）的外径。长度为1.2-2.5 m，并具有绕过的网带（24）。搓纸辊上铺有网状袜，并有一个内部吸水箱，或者从外部的吸水箱上抽出了吸尘器。或者，吸纸辊（20）的吸水箱分为多个区域。鼓风干燥单元（18）具有特别大的支撑辊（26）或类似物，带有鼓风干燥器（28）。幅材（12）被拾取辊（20）转移至支撑辊（26）。该组件还可具有带有相关干燥器的另一个更大的支撑辊。支撑辊（26）具有外径。 2.5-8.0 m和首选3-5米网带（30）绕过支撑辊（26），支撑辊是吸辊或圆柱体。通过多个支撑辊的支撑带可以代替支撑辊（26），其支撑辊以圆弧形展开。干燥单元（18）具有至少一个罩（28），该罩被定位和/或覆盖被幅材覆盖的辊的弧形段（α）以给出最小值。大支撑辊（26）和最终压榨压区（14）之间的间隙。在有两个支撑辊的情况下，纤网从第一辊（26）处的网带（30）转移到后续干燥单元的大支撑辊上。可以展开支撑辊，以使每个辊都靠在纸幅的另一侧，第一干燥单元（18）作用在纸幅（12）的上侧，而下一个干燥单元在纸幅的下侧工作， 或相反亦然。干燥单元（18）在机器的压榨部（16）的最终压榨压区（14）和第一多缸组（40）之间，带有一个一体式机罩（28），另一个干燥单元带有多件套和偏好。两部分罩。设置干燥单元（18）以将纸幅的干燥材料含量提高至55-65％。干燥单元（18）带有一个预先安装或集成的红外线加热器。机器以70-120 m / sec的速度运行。和偏好。干燥单元（80）在80-100 m / sec。的温度下运行。 250-450℃和优选。 250-350摄氏度。机罩（28）带有直径的喷孔。 10毫米的吸口和/或吸气口，喷口的开口率为1.5-3.5％。被孔隔膜覆盖，以防堵塞。用于记录纸幅断裂的传感器在干燥单元（18）之前和/或之后，或在它们之间。
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