Pulp Molding Wet End Chemistry Theory

The theory of wet-end chemistry in pulp molding involves chemical reactions and processing steps during pulp preparation and molding to adjust the properties and moisture content of the pulp to create the desired paper or board product. Here are some key aspects related to wet-end chemistry theory:

1. pH control: The pH value of pulp is an important parameter, which can be adjusted by adding chemicals such as alkaline or acidic substances. Under different pH conditions, the charge state of cellulose will change, thereby affecting the dispersion of pulp and the aggregation of cellulose. By controlling the pH value, the stability and molding properties of the pulp can be adjusted.

2. Chemical additives: In wet end treatment, various chemical additives, such as papermaking chemical additives, anti-foaming agents, thickeners, etc., are often used to improve the performance of the pulp. These chemical additives can be used to enhance the strength of paper, improve gloss, improve printing performance, etc.

3. Bleaching: During the pulp preparation process, wood pulp usually needs to be bleached to remove impurities and improve the whiteness of the paper. This involves using chemical bleaches, such as oxychlorine or peroxide, to remove pigments and other impurities from the wood pulp.

4. Wet-end blending: During wet-end chemical processing, pulps from different sources often need to be blended together to obtain the desired fiber characteristics and texture. During the mixing process, chemical processing conditions may need to be adjusted to ensure uniformity and consistency.

In conclusion, wet-end chemistry theory plays a key role in the pulp molding process, helping to adjust the properties of the pulp to meet the requirements of the final product. By controlling pH, using chemical additives, bleaching and blending processes, manufacturers can precisely control the quality, performance and appearance of paper. These chemical processing steps are an important part of pulp molding.

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