助濾策略和助濾體系
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.
成型區(qū)的脫水常常是紙張生產(chǎn)時速度受到限制的環(huán)節(jié)。這種情況下，如果能找到一種方法加快濕紙頁的脫水，那么紙機的生產(chǎn)速度就可以得到提高了，甚至紙張質(zhì)量的提高也有了可能(跟具體情況有關)。紙機設備供應商為此提供了多種裝置，如脫水案板(hydrofoils)、真空箱、真空伏輥、寬區(qū)濕壓榨(extended-nip wet-presses)等，以在紙頁被蒸發(fā)干燥前更快更多地獲得脫水。本章將重點介紹促進濾水的化學助劑以及它們的應用方式。
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