Paperboard Sizing with Dispersed Rosin and ASA
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing paperboard sizing methods require excessive amounts of sizing agents to achieve adequate moisture resistance and edgewicking prevention, leading to increased costs and potential negative attributes like reduced friction and polymer adhesion.
Innovation Solution
A dual sizing process using a combination of dispersed rosin sizing (DRS) and alkenylsuccinic anhydride (ASA) applied in an acidic paper machine system, which reduces the overall amount of sizing agents needed while maintaining or improving edgewicking resistance, friction properties, and polymer adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more sizing agent is used to improve liquid resistance and edgewicking behavior, then edgewicking resistance is improved, but cost increases and friction properties deteriorate
Solution Approach 1:
The patent combines two different sizing agents (rosin and ASA) into a dual sizing system. This combination allows achieving superior edgewicking resistance and liquid resistance while maintaining friction properties, as the synergistic effect of the two agents provides better performance at lower dosages compared to using either agent alone at high concentrations.
Solution Approach 2:
The patent optimizes the dosage parameters of the sizing agents by using a combination of rosin (2-8 lb/ton) and ASA (2-5 lb/ton), which reduces the total sizing agent requirement compared to traditional single-agent systems. This parameter optimization achieves the desired edgewicking resistance while controlling costs and maintaining friction properties.
2Reliability
If more sizing agent is used to improve liquid resistance, then edgewicking resistance is improved, but polymer adhesion deteriorates
Solution Approach 1:
The dual sizing system combines rosin and ASA in complementary dosages to achieve a balance where edgewicking resistance is improved without excessive polymer adhesion loss. The combination provides synergistic benefits that maintain polymer adhesion at lower total dosages compared to traditional single-agent systems.
3Reliability
If traditional single-agent sizing is used to achieve adequate moisture resistance, then edgewicking resistance is improved, but cost increases
Solution Approach 1:
The patent merges two sizing agents (rosin and ASA) in a dual sizing system that achieves superior moisture resistance and edgewicking prevention at lower total dosages. The combination provides synergistic effects that reduce the overall quantity of sizing agent needed compared to traditional single-agent systems requiring higher concentrations.
Solution Approach 2:
The patent optimizes the dosage parameters by using controlled amounts of rosin (2-8 lb/ton) and ASA (2-5 lb/ton), which reduces the total sizing agent quantity required while maintaining adequate moisture resistance and edgewicking resistance. This parameter optimization leads to cost reduction compared to traditional high-dosage single-agent systems.
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
The combination of DRS and ASA achieves equivalent or better paperboard properties with less overall sizing agent, reducing costs and minimizing hydrolysate buildup, maintaining friction, and enhancing polymer adhesion, while providing superior resistance to penetrants and alum mordants.
Implementation Method 1
The ability of sizing agents to attach to cellulose fibers is an important factor in the effectiveness of the sizing agents. The direct to cellulose sizing mechanism of ASA is superior to rosin
Implementation Method 2
The direct to cellulose sizing mechanism of ASA is superior to rosin
Implementation Method 3
Internal sizing agents add moisture resistance to the paperboard
Data Source
AI summary
Substrates for paperboard packing with improved internal sizing including the use of a combination of a dispersed rosin size (DRS) with an alkenylsuccinic anhydride size for reducing edgewicking with less use of the sizing agents.