Creping Blade Front Bevel 3D Roughness
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Solution Overview
Problem
Existing creping blades do not effectively enhance tissue bulk and absorbency properties, and there is a need for an innovative solution that can positively impact paper thickness and bulk in a controlled manner, while being versatile and easy to produce.
Innovation Solution
A creping blade with a front bevel surface featuring specific 3-D areal roughness measurements (Sa>0.7 μm, Sz>18 μm, and/or Sq>1.0 μm) that modifies the stress during the detachment of the paper web from the dryer cylinder, breaking and distorting fibre bonds to increase bulk and absorbency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional smooth creping blade is used, then the blade structure is simple and easy to manufacture, but the tissue bulk and absorbency properties are not enhanced
Solution Approach 1:
The invention changes the surface roughness parameter of the creping blade from conventional smooth (Ra < 0.8 μm) to specifically rough (Ra ≥ 0.8 μm). This parameter change in surface topology enables enhanced tissue bulk and absorbency by modifying fibre bond disruption during creping, without changing the basic blade structure or material composition.
2Manufacturing precision
If the blade surface roughness is increased to enhance bulk, then tissue bulk and absorbency improve, but the control over other tissue product qualities becomes more difficult
Solution Approach 1:
The invention establishes a specific threshold parameter (Ra ≥ 0.8 μm) for surface roughness that provides a controllable minimum level of fibre bond disruption. This quantified parameter enables consistent enhancement of bulk and absorbency while providing a clear manufacturing target for quality control.
Data Source
AI summary
A blade for creping a paper web from a dryer cylinder surface. The blade has a leading side and a front bevel surface to be impacted by the paper web. The leading side and the front bevel surface meet at a contact edge to contact the dryer cylinder. The front bevel surface has a 3D areal roughness, measured according to ISO 25178, of Sa>0.7 μm and/or Sz>18 μm and/or Sq>1.0 μm.