I am very happy to share some small articles about papermaking chemistry with you. In order to better understand wet end chemistry from the perspective of measurement.

The first thing we need to know is the importance of learning wet end chemistry system measurement technology:

  1. A comprehensive understanding of the characteristics of the papermaking system must rely on various wet end chemical measurement techniques: Justlike a person who needs regular physical examinations, without the help of modern analytical testing instruments, the understanding the characteristics of the papermaking system  can’t beachieved easily. What’s more, a good grasp of the characteristics of the papermaking system, sometimes even if you only know one or two index data, you can greatly reduce the blindness of the work, that is, reduce unnecessary work links, which will greatly help improve the running performance of paper machine and quality of paper products. [Expansion: The fundamental purpose of studying papermaking auxiliaries and wet end chemistry is to improve the running performance of paper machines and the quality of paper products. Papermaking wet end auxiliaries are distinguished between process chemicals and functional chemicals. The former is mainly used to improve the running performance of paper machines. Representatives include resin and stickies control agents, scale control agents, bactericides and other deposit control agents, defoamers/foam inhibitors/deaerators, retention aids Filters, etc; the latter is mainly to give paper special properties, representative of which are dry strengthening agent/wetting strength agent, internal sizing agent, dye/brightening agent, etc.]
  2. Contribute to the establishment of a world-class research center for papermaking additives and wet end chemistry: For papermaking, since papermaking additives and wet end chemistry are so important, and China is already the world’s largest papermaking country in terms of production and consumption, it is very necessary to establish a world-class papermaking additives and wet end chemistry research center if China still wants to be the strong papermaking country in the world in the future. And without knowing advanced measurement technology, to build a first-class research center is tantamount to building a “castle in the air.”
  3. Contribute to technology and product innovation: There is no need to say, innovation is hard to come out of thin air, especially the implementation of innovation, undoubtedly requires the cooperation of high-end equipment.
  4. Contribute to the establishment of various test standards: The importance of establishing various test standards is self-evident, and it is necessary to know the test principles, procedures, advantages and disadvantages of the instrument well.

    And then, this table mainly lists important wet end chemical system measurement items, including pH value, conductivity, cation demand, zeta potential, COD/TOC, gas content, organic/inorganic/microbial sediments, retention rate and water filtration Speed, flocculation behavior, paper uniformity, etc.

Serial number Measurement item Measuring instruments and methods
1 pH value (white water, slurry) pH meter
2 conductivity (white water, slurry) conductivity meter
3 Cation demand (the amount of electricity in the water phase of the slurry) PCD analyzer, colloidal titration (CT) method
4 Potential of fibers, fillers, and colloidal substances (potential of the solid phase of the slurry) ζ-potentiometer, colloidal titration ratio (CTR) method
5 Organic matter/auxiliary content in white water: COD/TOC/starch content/CPAM content, etc. KMnO4 method, K2CrO7, ultraviolet-visible spectrometer, fluorescence spectrometer, etc.
6 Slurry gas content Air Tester
7 Determination of organic pollutants (resin, stickies) Filtration retention, turbidity, cation demand, COD, GC-MASS, etc.
8 Microbial contamination trend determination Microbial content/microbial activity determination
9 Analysis of Water Hardness and Inorganic Fouling Tendency Wet water quality analysis method, etc.
10 Retention and filtration Dynamic water filter, etc.
11 Paper flocculation behavior and state Flocculation Tester, Focused Beam Reflection Tester, etc.
12 Paper formation Paper Formation Tester, etc.
13 Other related items Sizing degree, paper strength, etc.