Creping Adhesive Modifier Reduces Dryer Build-Up
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Creping adhesives used in paper production often result in adhesive build-up on dryer surfaces, leading to uneven web transfer, wrinkles, and increased downtime due to the need for frequent blade changes, while also affecting the softness and quality of the final paper product.
Innovation Solution
A creping aid system comprising a creping adhesive and a polyethylene-based creping modifier that maintains tackiness and softness, allowing for improved adhesion and uniformity, reducing adhesive build-up, and extending doctor blade life by up to 25%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a creping adhesive is applied to the dryer surface to ensure adequate adhesion, then web transfer is improved, but adhesive build-up occurs leading to uneven coating and increased maintenance
Solution Approach 1:
The patent modifies the adhesive composition by incorporating specific polymers (polyvinyl alcohol, carboxymethyl cellulose, or starch) and controlling molecular weight and hydrolysis degree to change the adhesive's physical and chemical parameters. This results in an adhesive that maintains adequate tackiness for web transfer while reducing build-up on the dryer surface.
Solution Approach 2:
The invention uses composite adhesive formulations combining multiple components: polymers (polyvinyl alcohol, carboxymethyl cellulose, starch), plasticizers (glycerol, sorbitol, or propylene glycol), and cross-linking agents. This composite approach creates an adhesive system that balances adhesion performance with reduced build-up characteristics.
2Ease of repair
If the adhesive is made softer to reduce build-up, then maintenance frequency is reduced, but adhesion strength may be compromised
Solution Approach 1:
The patent carefully controls the molecular weight and hydrolysis degree of the polymer components to optimize the balance between softness (reducing build-up) and adhesion strength. By adjusting these parameters, the adhesive remains soft enough to prevent build-up but maintains sufficient bonding strength for reliable web transfer.
Solution Approach 2:
The composite formulation combines polymers with different properties, plasticizers that provide softness without compromising strength, and cross-linking agents that enhance adhesion. This composite approach allows the adhesive to be soft and easy to remove while maintaining strong bonding characteristics.
3Productivity
If through-air-drying is used instead of conventional wet-pressing, then drying speed is improved, but adhesion to dryer surface deteriorates
Solution Approach 1:
The patent modifies the adhesive composition with specific polymers and controlled molecular weights to enhance its performance on through-air-dried webs. The adhesive formulation is optimized to maintain adequate adhesion even when the web is transferred at higher dryness levels, compensating for the reduced contact area and lower moisture content.
Solution Approach 2:
The invention uses composite adhesive systems combining polymers, plasticizers, and cross-linking agents that work synergistically to provide enhanced adhesion on through-air-dried webs. This composite formulation compensates for the challenges of transferring drier webs by creating stronger bonding characteristics.
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 creping aid system enhances paper production by ensuring consistent adhesion, reducing maintenance costs, and improving the quality of the creped paper with increased blade life and uniform coating, while maintaining the softness and absorbency of the final product.
Implementation Method 1
The adhesion level of the web to the dryer surface is important, since it relates to the controllability of the web from the creping blade to the reel on which the paper is wound
Implementation Method 2
A creping aid system comprising a creping adhesive and a polyethylene-based creping modifier that maintains tackiness and softness, allowing for improved adhesion and uniformity, reducing adhesive build-up
Implementation Method 3
Creping, by breaking a significant number of interfiber bonds, increases the perceived softness of the resulting product. The fibrous structure of the paper is mechanically foreshortened in the machine direction
Implementation Method 4
most of the paper's strength is derived from hydrogen bonding, which links the cellulosic fibers to one another
Implementation Method 5
The level of adhesion of a web to a creping dryer surface is also important because it relates to the transfer of heat from the surface of the dryer to the web and ultimately affects the drying rate
Data Source
AI summary
A creping aid system for use on a creping cylinder, for example, a Yankee dryer, comprises a creping adhesive and a creping modifier, the combination comprising polyethylene.