Method for measuring first pass retention of wet end rapidly

Abstract

First pass retention of paper stuff is a primary indicator for reservation situation of fibre and other solid content on the forming fabric in estimating paper manufacture wet end page forming process, and also an important indicator of regular detection in paper mill production process which directly reflects whether the wet end working regular or not. The invention provided method for measuring first pass retention of wet end rapidly, the measurement steps are: first preparing concentration of paper stuff; then measuring concentration of filtrate, and then measuring turbidity of the filtrate and at last determining the first pass retentioin according to concentration of paper stuff, concentration of filtrate and turbidity of the filtrate with correlation formula. But when measuring first pass retention according to the Tappi standard, the operation process is trivial and relatively expensive detectiong equipment is needed, which is very incovenient. After several experiments and combining with related information study, the inventor found that, there is good relativity between concentration and turbidity of the paper stuff filtrate and using the concentration of the filtrate and concentration of the paper stuff can calculate out first pass retention of the paper stuff directly.

Description

1. Technical field [0001] The invention relates to a detection method in the sheet forming process of the wet end of papermaking, in particular to a method for measuring the primary retention rate in the sheet forming process of the wet end of papermaking. 2. Background technology [0002] The primary retention rate refers to the percentage of the solids left in the paper sheet after the paper stock is dehydrated by the papermaking wire to the total solids in the paper stock. It is not economical to carry out a large number of retention experiments with paper machines, so only experiments are used to evaluate retention aids and explain the impact of various chemical parameters on primary retention. At present, the Britt dynamic water filter instrument is commonly used in the laboratory for the detection and research of paper retention. However, when using a dynamic water filter to detect the retention rate, the operation process is cumbersome, the human operation error is l...

AI Technical Summary

Problems solved by technology

However, when using a dynamic water filter to detect the retention rate, the operation process is cumbersome, the human error is large, and relatively expensive testing equipment is required, which is very inconvenient

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