Creping Blade With Varying Friction Sections
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Solution Overview
Problem
The existing creping process for cellulosic webs often results in a finished product with limited caliper, as the creping blade may not effectively increase the thickness of the web during removal from the drying drum.
Innovation Solution
A creping blade with a shelf featuring sections of varying coefficients of friction, where the second section has a higher coefficient of friction than the first section, is used to remove the cellulosic web from the drum. This design allows for increased microfolds and macrofolds in the web, thereby enhancing its caliper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional creping blade is used to remove the cellulosic web from the drying drum, then the web can be removed efficiently, but the finished product has limited caliper (thickness)
Solution Approach 1:
The creping blade shelf is divided into multiple sections with different coefficients of friction. The first section has a lower coefficient of friction to allow smooth web movement, while the second section has a higher coefficient of friction to create microfolds and macrofolds, thereby increasing caliper while maintaining efficient web removal
Solution Approach 2:
The invention changes the friction parameter along the shelf length, creating zones of varying friction coefficients. This parameter variation allows the blade to simultaneously achieve smooth web transport and effective folding to increase thickness
2Volume of moving object
If the creping blade creates more microfolds and macrofolds to increase caliper, then the thickness of the web increases, but the complexity of the blade design increases
Solution Approach 1:
Instead of complicating the overall blade structure, the invention applies local quality changes by creating sections with different friction coefficients on the shelf surface. This achieves increased caliper through localized friction variation rather than complex mechanical structures
Solution Approach 2:
The shelf surface incorporates different materials or surface treatments in different sections to achieve varying friction coefficients. This composite approach allows complex functional requirements to be met through material selection rather than mechanical complexity
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 effectively increases the caliper of the final tissue product by forming more microfolds and macrofolds, providing greater thickness and potentially allowing for adjustments in other tissue making process parameters to achieve desired product qualities.
Implementation Method 1
the shelf has a first section having a first coefficient of friction and a second section have a second coefficient of friction and the second coefficient of friction is greater than the first coefficient of friction
Data Source
AI summary
A method of creping a web including supporting the web on a drum and rotating the drum to move a first length of the web proximate to a creping blade such that the creping blade removes the first length from the drum. The creping blade has first and second sections made of a base material. The base material has a first coefficient of friction at the first section and is processed to produce a second coefficient of friction at the second section greater than the first coefficient of friction. The method includes moving the first length along the first section, removing a second length of the web from the drum with the creping blade, moving the first length along the second section, forming the second length into at least one microfold as the first length contacts the second section, and forming the second length into at least one macrofold.