Creping Blade Wear-Resistant Coating and Protective Layer Design
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Solution Overview
Problem
Current creping blades, such as steel and ceramic blades, suffer from short service life and unstable wrinkle formation due to wear resistance issues and brittleness, leading to compromised paper quality and increased production costs.
Innovation Solution
A creping blade with a wear-resistant coating on the top surface and a protective layer below the coating at the contact point with the dryer, where the protective layer has a lower hardness than the dryer, reducing the risk of damage and maintaining the sharpness of the working edge, thereby extending the blade's life and improving paper quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a steel creping blade is used, then the blade can be manufactured with good toughness and initial sharpness, but the service life is short due to poor wear resistance
Solution Approach 1:
The creping blade combines a steel base with a ceramic coating layer to create a composite structure. The steel base provides toughness and structural integrity, while the ceramic coating provides superior wear resistance. This composite material approach resolves the contradiction between short service life and poor wear resistance by integrating materials with complementary properties.
Solution Approach 2:
The ceramic coating is applied specifically to the working surface and contact areas of the blade where wear occurs most intensely. This local application of hard, wear-resistant material precisely where needed maintains blade sharpness and extends service life without requiring the entire blade to be made of brittle ceramic material.
2Duration of action of moving object
If a ceramic coating is applied to improve wear resistance, then the service life is extended, but the brittleness of the coating causes edge passivation and unstable wrinkles
Solution Approach 1:
The blade design incorporates different surface geometries at different locations: a smaller transition angle at the contact point for penetrating dryer surface irregularities, and a larger transition angle at the top surface for maintaining stable wrinkle formation. This local differentiation of geometric properties stabilizes the blade edge composition and prevents passivation during extended service.
Solution Approach 2:
The creping blade is designed with specific dynamic characteristics including a predetermined angle between the top surface and working surface, and controlled rigidity and elasticity in the base. These dynamic properties allow the blade to maintain stable contact with the dryer surface and paper throughout its extended service life, preventing edge passivation and wrinkle instability.
3Reliability
If the transition angle at the contact point is reduced to improve wear resistance, then the blade can penetrate dryer surface irregularities, but the top surface angle needs to be optimized for wrinkle uniformity
Solution Approach 1:
The blade features a smaller transition angle specifically at the contact point with the dryer to enable penetration of surface irregularities and maintain reliable contact. Simultaneously, the top surface is designed with a larger transition angle optimized for creating uniform wrinkles on the paper. This local differentiation of angular geometry resolves the contradiction between penetration capability and wrinkle uniformity.
Solution Approach 2:
The blade surface is segmented into distinct functional zones: a contact point area with smaller transition angle for penetration, and a top surface area with larger transition angle for wrinkle formation. This segmentation of the blade surface into zones with different geometric properties allows each zone to optimize its specific function, resolving the contradiction between penetration and wrinkle uniformity.
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 blade achieves a significantly longer service life and consistent paper quality by maintaining the sharpness of the working edge and preventing damage to the dryer, resulting in reduced labor intensity and waste, while producing high-quality paper with uniform wrinkles.
Implementation Method 1
a wear-resistant coating is provided on the top of the base... the wear-resistant coating is usually ceramic material, or composite material containing carbide
Implementation Method 2
a protective layer is arranged below the wear-resistant coating at the contact point between the creping blade and a dryer, and the hardness of the protective layer is lower than that of the surface of the dryer
Data Source
AI summary
A creping blade and a preparation method thereof are provided. The creping blade comprises a base, wherein a wear-resistant coating is provided on the top of the base, and a protective layer is arranged below the wear-resistant coating at the contact point between the creping blade and a dryer, and the hardness of the protective layer is lower than that of the surface of the dryer of a paper machine. The creping blade of the invention is advantageous in that the friction portion of working surface has an unlimited area and has a high wear-resistant coating, and the paper impact portion has high wear resistance and high impact resistance, so that the creping blade has a long service life, which can be several times or even tens of times that of the common steel creping blade.