造纸法再造烟叶涂布液悬浮物富集机理分析及降黏研究

Study on the Enrichment Mechanism of Suspended Substances and Viscosity Reduction of Papermaking Reconstituted Tobacco Coating Liquid

中文关键词:  造纸法再造烟叶  涂布液  固形物  降黏  分散剂

Key Words:papermaking reconstituted tobacco  coating liquid  solids  viscosity reduction  dispersants

中文摘要:

      对造纸法再造烟叶涂布过程中涂布液进行黏度测定并分析涂布液离心固形物化学成分，研究了回流涂布液黏度升高的现象，找出悬浮物富集的原因，并提出回流涂布液的降黏方法。结果表明，回流涂布液的离心固形物含量高于新鲜涂布液，且主要成分为含碳物质，平均粒径为1~2 µm，Ca元素含量达37%；造成回流涂布液黏度升高的主要原因是基片中细小组分间的结合强度弱，易脱落至回流涂布液，且回流涂布液中过高的Ca元素含量也是导致其黏度升高的主要因素；在回流涂布液中添加0.1%的聚乙二醇400，其黏度由416.4 mPa·s降至243.5 mPa·s，平均粒径由0.339 µm降至0.116 µm。

Abstract:

      The viscosity of coating liquid from coating process of papermaking reconstituted tobacco was tested and the chemical composition of centrifuged solid substances in the coating liquid was analyzed. The viscosity increasing phenomenon of reflux coating liquid was studied to reveal the cause of enrichment in suspended substance， and the solution to viscosity reduction of reflux coating liquid was proposed. The results showed that reflux coating liquid with higher solid content than that of its fresh counterpart mainly composed of carbon-containing substance， with average particle size of 1~2 µm， Ca content of 37%. Fine components in the substrate with weak bonding strength which renders their peeling off into reflux coating liquid and excessive Ca content in the liquid are the main causes of its increased viscosity. While when 0.1% polyethylene glycol 400 was added to the reflux coating liquid， the viscosity decreased from 416.4 to 243.5 mPa·s， and the average particle size from 0.339 to 0.116 µm.