Study On High Porosity Plug Wrap Paper Manufacture And Process Design

The plug wrap paper entitles filter tip paper as well as, it belong to flimsy special paper using in industry, and mostly use in tobacco industry to wrap the filter tip bundle of cigarette, it was identified two sorts, one was called ordinary plug wrap paper, and another one was called high porosity plug wrap paper(HPPW). So HPPW drive at the plug wrap paper of which porosity is more than 3000 CU. Most of HPPW which was used in Chinese tobacco industry depends on import, and most of oversea company manufactures HPPW on incline wire paper machine. This thesis wants to discuss about the HPPW process design and HPPW manufacture technology through analyzing and reconstructing Minfeng PM18 which currently produce cigarette paper to fit HPPW manufacture requirement, to find a way which can produce HPPW on fourdrinier on a large scale.After analyzing and mensurating fibre length, width, protonema angle degree, optical characteristic, chemistry characteristic and strength characteristic of five kinds softwood, finding the Brunswick stock which was produced by Georgia-Pacific company of U.S.A is a ideal material for HPPW.Tobacco industry requires HPPW with a good surface strength no ash drop and appropriate water-resistant ability, so the process design of HPPW need consider sizing in stock and size pressing on paper machine. Via lab experiment, when the dosage of AKD is about 0.3 percent and the dosage of LS-2 starch is about 1.0 percent, the Cobb30 value of HPPW is suitable for the requirement of tobacco industry.In order to improve paper formation and reduce porosity Variation coefficient of HPPW, it is necessary to consider dosing dispersant in approach system. Via lab experiment, when the dosage of Guar Gum is about 0.05 percent, the formation of HPPW is perfect and the white water consistency is low.The process design of HPPW has a special requirement due to its raw material characteristic, beating requirement and paper characteristic are very special. Because its fibre raw material is longer fibre and need not strongly sever and to be fastigiated during beating, so its process of stock preparation system should be short to avoid fibre block pipe and pump because of fibre sinking and knotting. Because dewatering speed of stock is fast in forming wire, diluting stock strongly and reducing stock consistency is helpful to formation, so the approach system must be provided with a more big capacity to fit the big flow. After comparing and analyzing the stock preparation process of producing HPPW on oversea incline paper machine and fourdrinier, andcombined the current process characteristic of Minfeng PM18 into considering, considering the solution of stock preparation process detail see drawing 3-9 and approach system process detail see drawing 3-8 is suited to produce HPPW.After analyzing the data table of big scale HPPW producing in Minfeng PM 18, It was shown that all technics parameter mentioned in chapter 4.5 is suitable for HPPW producing except dry curve need to be adjusted to correspond the figure which was described in table 4-4 and chart 4-2. If HPPW was produced according this process and technics parameter which was modified , the quality can meet with the HPPW standard which was required by customer totally.According to the experience from the big scale producing of HPPW, It is critical for high-class HPPW manufacture to avoid fibre sinking and block in stock preparation system, to control a proper water line and forming in wet part, to insure the felt a good cleaning, to adjust a proper dry curve and to insure the process system cleaning.