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助滤策略和助滤体系
Drainage Strategies and Systems
§1.Introduction
§1.引言
The removal of water in the forming section is often the rate-limiting process during the manufacture of paper. In such cases, if a means can be found to allow water to separate itself more quickly from the wet web of paper, then the rate of production on the paper machine could be increased. Depending on the details, there can be opportunities also to improve product quality. Vendors of paper machine equipment provide a variety of devices, such as hydro foils, vacuum boxes, vacuum couch rolls, and extended-nip wet-presses to encourage quicker or greater release of water before the evaporative drying. This chapter will focus on drainage-promoting chemical additives and the manner of their implementation.
成型区的脱水常常是纸张生产时速度受到限制的环节。这种情况下，如果能找到一种方法加快湿纸页的脱水，那么纸机的生产速度就可以得到提高了，甚至纸张质量的提高也有了可能(跟具体情况有关)。纸机设备供应商为此提供了多种装置，如脱水案板(hydrofoils)、真空箱、真空伏辊、宽区湿压榨(extended-nip wet-presses)等，以在纸页被蒸发干燥前更快更多地获得脱水。本章将重点介绍促进滤水的化学助剂以及它们的应用方式。
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