Reactive PAE Creping Adhesive Cross-Linking Control
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Solution Overview
Problem
The existing creping adhesive technologies, particularly thermosetting polyamide-epichlorohydrin polymers, face challenges in controlling adhesion and rewetability, leading to issues such as adhesive build-up and reduced sheet quality due to limited control over cross-linking, which affects the creping process and tissue product quality.
Innovation Solution
A creping adhesive composition based on a reactive, lightly crosslinked polyamidoamine-epihalohydrin polymer, optionally combined with a reactive modifier, is used to control adhesion properties by varying the crosslinking density, allowing for optimized adhesion and release from the Yankee dryer surface under different moisture conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermosetting polyamide-epichlorohydrin polymers are used as creping adhesive, then adhesion control is improved, but adhesive build-up and streaking occur due to limited control over cross-linking
Solution Approach 1:
The patent changes the cross-linking parameter by using a reactive modifier that controls the degree of cross-linking in the thermosetting adhesive. This allows the adhesive to maintain reliable adhesion while preventing excessive build-up and streaking by optimizing the cross-linking density to an appropriate level.
Solution Approach 2:
The patent creates a composite adhesive system by combining the thermosetting polyamide-epichlorohydrin polymer with a reactive modifier. This composite approach enables the adhesive to achieve both strong adhesion and controlled release properties, preventing the harmful build-up and streaking effects.
2Strength
If cross-linking density is increased to improve adhesion, then adhesion strength is improved, but rewetability control is reduced
Solution Approach 1:
The reactive modifier enables independent control of cross-linking density and rewetability. By adjusting the amount and type of reactive modifier, the adhesive can achieve high adhesion strength through controlled cross-linking while maintaining appropriate rewetability for different moisture conditions.
3Manufacturing precision
If adhesive build-up is reduced to improve creping quality, then creping performance is improved, but adhesion control becomes insufficient
Solution Approach 1:
The composite adhesive system with reactive modifier provides balanced performance by achieving both high creping quality and reliable adhesion control. The controlled cross-linking density prevents excessive build-up that would interfere with creping, while maintaining sufficient adhesion for proper web transfer.
4Duration of action of stationary object
If thermosetting adhesives are used to provide durability, then adhesive durability is improved, but doctor blade chatter increases
Solution Approach 1:
The reactive modifier optimizes the cross-linking parameter to achieve appropriate adhesive durability without excessive build-up. This balanced cross-linking density provides durable adhesive performance while reducing the stiffness and build-up that cause doctor blade chatter.
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
This approach provides improved control over adhesion and rewetability, leading to enhanced creping performance and tissue product quality across a wide range of operating conditions, including high drum temperatures and low moisture content, while maintaining adhesive durability and reducing doctor blade chatter.
Implementation Method 1
A creping adhesive composition based on a reactive, lightly crosslinked polyamidoamine-epihalohydrin polymer, optionally combined with a reactive modifier, is used to control adhesion properties by varying the crosslinking density
Implementation Method 2
thermosetting creping adhesive with reactive modifiers
Data Source
AI summary
A creping adhesive comprising a PAE composition comprising a reactive, light crosslinked polyamidoamine-epichlorohydrin polymer (PAE-type polymer) optionally in combination with a reactive modifier and the corresponding method for of creping cellulosic fiber webs with the adhesive.