Spinning Can Sliver Placement with Offset Layer Intersections
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Solution Overview
Problem
Existing methods for depositing fiber material in cans result in uneven layer stacking, leading to unpredictable fill volume and reduced fiber quality due to excessive compression, and cause mechanical stress on the deposition device.
Innovation Solution
A method involving a predetermined displacement of the depositing head with specific cycle steps to control the position and movement, ensuring precise deposition and minimizing overlapping layers, thereby optimizing fill volume and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the depositing head remains stationary during can rotation, then the fiber sliver layers are deposited concentrically with predictable positioning, but the intersection points stack vertically causing excessive height gain and requiring strong compression that deteriorates fiber quality
Solution Approach 1:
The depositing head is made dynamically movable in the circumferential direction relative to the can, transitioning from a stationary position to a position that varies during can rotation. This dynamic adjustment disperses the vertical stacking of intersection points, reducing the number of layers at any single vertical location and thereby reducing compression requirements and preserving fiber quality.
Solution Approach 2:
The invention introduces a new degree of freedom by moving the depositing head not only radially but also in the circumferential direction along the can rotation. This additional dimensional movement transforms the deposition pattern from simple concentric circles to offset patterns that prevent vertical alignment of intersection points, solving the compression problem while maintaining positioning precision.
2Object-affected harmful factors
If the can depositing head is irregularly displaced to counteract vertical stacking, then fiber quality may be improved, but the fill volume becomes unpredictable and mechanical stress increases due to jerky movements
Solution Approach 1:
Instead of irregular displacement, the invention implements periodic, predetermined movement of the depositing head in the circumferential direction that is synchronized with the can rotation. This periodic action ensures consistent dispersion of intersection points throughout the can volume, making fill volume predictable while maintaining fiber quality through reduced compression.
Solution Approach 2:
The depositing head movement is automatically controlled to vary its position according to the can rotation phase, making the system self-regulating. The predetermined circumferential displacement pattern automatically adapts to each rotation cycle, ensuring consistent layer distribution and predictable fill volume without requiring external irregular adjustments.
3Stability of the object's composition
If the depositing head is irregularly displaced to avoid vertical intersection stacking, then layer distribution may improve, but stress on the can depositing device increases due to jerky movements
Solution Approach 1:
The depositing head employs smooth, continuous dynamic movement in the circumferential direction rather than abrupt irregular displacements. This dynamic positioning varies the head location progressively during deposition, achieving uniform layer distribution while maintaining smooth motion that minimizes mechanical stress on the deposition device.
4Productivity
If concentric circular ring paths are used for deposition, then deposition efficiency is high, but intersection points stack vertically reducing fill volume and requiring compression
Solution Approach 1:
The invention modifies the conventional concentric circular deposition path by adding circumferential displacement to the depositing head position. This creates offset ring paths that are still efficiently deposited but are distributed throughout the can volume rather than stacking at vertical intersections, maximizing fill volume without compromising deposition efficiency.
Data Source
Figure 1a~2b
Figure 3~5b
Figure 6a~6d
AI summary
The invention relates to a method for placing fibrous material in a can (1) having a first step, in which a fibrous-material-placement head is positioned above the can (1) in a predetermined starting position (2). A cycle follows. The cycle comprises a first cycle step in which a predetermined fibrous-material length is placed into the can (1). I.e. the position of the placement head does not change. Subsequently, in a second cycle step, the placement head is shifted away from the current position according to predetermined information. The predetermined fibrous-material length is different at least between two cycles.