Papermaking Belt Amorphous Pattern for Fiber Distribution
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Solution Overview
Problem
Existing papermaking belts face issues with fiber loss, non-uniform fiber distribution, pinholes, and Moire patterns due to inadequate reinforcing structures and patterns, which affect the quality and appearance of paper products.
Innovation Solution
A papermaking belt with a reinforcing structure of interwoven machine direction and cross-machine direction yarns, combined with a pattern layer featuring an amorphous pattern of elongate two-dimensional geometrical shapes with a statistically-controlled degree of randomness, which enhances airflow and fiber support while minimizing pinholes and Moire patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fine mesh reinforcing element is used to control fiber deflection, then fiber distribution uniformity is improved, but seam strength and structural stability deteriorate
Solution Approach 1:
The reinforcing element is segmented into discrete machine direction yarns and cross-machine direction yarns that are interwoven, rather than using a continuous fine mesh. This segmentation allows each yarn to maintain structural integrity while collectively providing fiber distribution control.
Solution Approach 2:
The belt uses a composite structure combining machine direction yarns and cross-machine direction yarns in an interwoven configuration. This composite approach provides both the structural strength needed for seam integrity and the fiber distribution control required for uniform papermaking.
2Stability of the object's composition
If a continuous resin pattern is used to lock fibers, then fiber stability is improved, but airflow leakage is reduced
Solution Approach 1:
The resin pattern is applied locally at specific locations rather than continuously across the entire belt surface. This localized resin application provides fiber stabilization at critical areas while maintaining airflow channels in other regions, preventing both fiber displacement and airflow leakage.
Solution Approach 2:
The continuous resin pattern is segmented into discrete resin applications at specific locations. This segmentation allows the resin to lock fibers where needed while leaving gaps for airflow, resolving the contradiction between fiber stability and airflow maintenance.
3Duration of action of stationary object
If large diameter yarns are used to increase belt life, then durability is improved, but pinhole formation increases
Solution Approach 1:
The yarn diameter parameter is optimized to a specific range that balances belt life and pinhole prevention. The machine direction and cross-machine direction yarns have controlled diameters that provide sufficient structural support for durability while maintaining small enough openings to prevent short fiber penetration and pinhole formation.
4Productivity
If vacuum pressure is increased to improve dewatering, then water removal efficiency is improved, but fiber penetration through the belt increases
Solution Approach 1:
The interwoven composite structure of machine direction and cross-machine direction yarns creates a reinforcing network that resists fiber penetration even under increased vacuum pressure. The composite architecture distributes the vacuum load across multiple yarns, preventing individual yarn failure and fiber breakthrough.
Solution Approach 2:
The knuckle configuration in the interwoven yarn structure creates a curved, three-dimensional architecture that provides mechanical resistance to fiber penetration. The curved yarn paths and knuckle formations distribute stress and prevent linear fiber breakthrough paths.
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 solution reduces fiber loss, ensures uniform fiber distribution, eliminates pinholes, and produces aesthetically acceptable products by maintaining airflow and providing adequate fiber support, thereby improving belt life and product quality.
Implementation Method 1
Air passes through the web and the through-air-drying belt to continue the dewatering process
Implementation Method 2
The air passing the through-air-drying belt and the web is driven by vacuum transfer slots, other vacuum boxes or shoes
Data Source
AI summary
A papermaking belt having a reinforcing structure and a pattern layer is disclosed. The reinforcing layer has a first layer of interwoven machine direction yarns and cross-machine direction yarns. The machine direction and cross-machine direction yarns of the first layer are interwoven in a weave. The pattern layer extends outwardly from and into the first layer. The pattern layer provides a web contacting surface facing outwardly from the first layer. The pattern layer further has at least one region having an amorphous pattern of elongate two-dimensional geometrical shapes having a longitudinal axis having an angle relative to either of the machine direction or the cross-machine direction. The amorphous pattern of two-dimensional geometrical shapes has a statically controlled degree of randomness.