Synthetic Metal Silicate Starch Papermaking Retention
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Solution Overview
Problem
Current papermaking processes using inorganic particulates for retention and dewatering face limitations in achieving optimal results without compromising paper or paperboard properties, necessitating a more effective synthetic alternative.
Innovation Solution
Incorporating a synthetic metal silicate (SMS) of the formula (Mg3-xLix)Si4Na0.33[Fy(OH)2-y]O10, produced through combining simple silicates, lithium, and magnesium fluoride under hydrothermal conditions, into the papermaking process, either alone or with starch, to enhance retention and dewatering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional inorganic particulates (colloidal silica, silica sols, borosilicate sols, smectite clays) are used for retention and dewatering, then sheet formation is facilitated with observed improvements, but the ability to achieve optimal retention and dewatering without compromising paper or paperboard properties is limited
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition and structure of inorganic particulates. Specifically, it uses synthetic metal silicates with controlled particle size distributions, surface charges, and compositions (including magnesium, lithium, and other metal silicates) to optimize both retention/dewatering performance and final paper properties. The systematic variation of particulate parameters enables simultaneous improvement of processing efficiency and product quality
Solution Approach 2:
The patent employs composite materials by combining different types of inorganic particulates (metal silicates, clays, oxides) with specific cellulose fiber compositions and sizing agents. This creates a composite slurry system where each component contributes specific functions: metal silicates provide retention and dewatering, clays contribute to sheet formation, and sizing agents enhance water resistance. The synergistic interaction within this composite system resolves the contradiction between processing performance and final product properties
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
SMS significantly improves flocculation response and fines retention, leading to better papermaking performance compared to existing synthetic and natural inorganic particulates, with enhanced dewatering rates and paper quality.
Implementation Method 1
The inorganic particulate has ranged from colloidal silica or silica sols, modified silica sols, and borosilicate sols, to naturally occurring smectite clays, used singly or in combination with each other. Even so, there is a need for a new synthetic inorganic particulate that provides even better retention and dewatering
Implementation Method 2
Retention and dewatering systems for use in papermaking currently utilize any component or combination of components from the following list: flocculant, coagulant, and inorganic particulate
Data Source
AI summary
The invention discloses a paper or paperboard produced from a slurry comprising cellulose fibers and an effective amount of SMS. In addition, a method for increasing retention and dewatering during the papermaking process is also disclosed. The method involves the addition of an effective amount of SMS to said papermaking process. The invention also discloses a method for increasing retention and drainage in a papermaking process comprising the steps of: adding both an effective amount of starch and an effective amount of SMS to a slurry of said papermaking process, wherein said starch is selected from the group consisting of: tapioca starch; potato starch; corn starch; waxy maize starch; rice starch; and wheat starch. Moreover, the invention comprises a method for increasing retention and drainage in a papermaking process comprising the steps of: adding both an effective amount of modified starch and an effective amount of SMS to a slurry of said papermaking process.