Variable Wrap Impingement Shoe for Twin Wire Gap Former
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Solution Overview
Problem
Modern twin fabric papermaking machines face challenges in achieving optimal sheet formation and fiber retention due to limitations in controlling the consistency of the stock entering the forming section, which is affected by factors like drainage, fabric tension, and impingement angle, leading to variations in paper quality.
Innovation Solution
The implementation of an adjustable impingement and forming shoe system, where the impingement shoe and forming shoe can be moved through controlled rotation and linear adjustments to optimize the point of impingement and effective drainage length, allowing precise control over stock consistency and fabric deflection angles, thereby enhancing fiber distribution and sheet formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the impingement shoe and forming shoe are fixed in position, then the machine structure is simple and reliable, but the sheet formation quality deteriorates when stock consistency varies
Solution Approach 1:
The patent applies the dynamics principle by making the impingement shoe and forming shoe movable rather than fixed. The impingement shoe can be positioned at different locations along the fabric path, and the forming shoe can be adjusted in position and angle. This dynamic positioning allows the operator to optimize sheet formation quality by adjusting the shoes' positions based on varying stock consistency conditions, while maintaining a relatively simple overall machine structure.
2Manufacturing precision
If the impingement shoe position is adjustable, then sheet formation quality improves, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the shoe positioning system into independent, adjustable components. The impingement shoe position is controlled separately from the forming shoe position, and each can be adjusted independently. This modular approach allows for precise control of sheet formation quality without requiring a completely complex integrated system, as each segment can be optimized and adjusted separately.
Solution Approach 2:
The patent applies parameter changes by allowing adjustment of key geometric parameters including the impingement shoe position along the fabric path, the forming shoe position, and the forming shoe angle relative to the fabric path. By changing these parameters, the system can optimize sheet formation quality for different operating conditions without fundamentally redesigning the entire device.
3Productivity
If the fabric deflection angle is increased to improve drainage, then water removal efficiency improves, but fiber distribution deteriorates
Solution Approach 1:
The patent applies dynamics by making the fabric deflection angle adjustable rather than fixed. The forming shoe can be positioned at different angles relative to the fabric path, allowing the operator to dynamically adjust the deflection angle based on the desired balance between drainage efficiency and fiber distribution. This enables optimization of both parameters under different operating conditions.
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
This solution enables the production of a wider variety of paper products with improved quality and reduced turnaround time by allowing for quick adjustments to the impingement point and fabric angles, optimizing the pressure pulses and drainage, thus overcoming the limitations of fixed structures in traditional machines.
Implementation Method 1
The hydraulic cylinder 164 is adapted to pivot the impingement shoe assembly about the pivot axis
Implementation Method 2
the impingement shoe assembly is adapted to be pivotable about a pivot axis which is transverse to the direction of travel of the fabric
Data Source
AI summary
A forming section for a gap blade former type papermaking machine having a headbox which delivers a jet of papermaking stock between a conveying forming fabric and a backing forming fabric is provided. The conveying fabric moves in sliding contact over an impingement shoe on which the jet of papermaking stock is delivered at a point of impingement. A forming shoe located immediately downstream of the impingement shoe over which the backing forming fabric slides. The impingement shoe is mounted for at least one of pivoting and transverse movement so that a position of the point of impingement of the jet of papermaking stock can be adjusted by at least one of rotating the impingement shoe about a first pivot point and transversely shifting the impingement shoe. The forming shoe can also be mounted for movement.