Dunnage Conversion Machine Flat Pad Production
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Solution Overview
Problem
Existing dunnage conversion systems fail to produce a relatively flat dunnage pad from slit-sheet material, as fully expanded material tends to warp and twist when fixed, leading to a non-planar dunnage pad.
Innovation Solution
A dunnage conversion machine that advances slit-sheet material through a series of rollers to expand it from an unexpanded to a partially expanded state, maintaining a flat configuration by reducing tension after full expansion, allowing the material to be securely fixed between cover sheets, thereby preventing warping and twisting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If slit-sheet material is fully expanded and then fixed to cover sheets, then the dunnage pad achieves maximum volume and density reduction, but the material warps and twists causing the pad to be non-flat
Solution Approach 1:
The patent applies preliminary action by expanding the slit-sheet material to a fully expanded state before fixation, then using relaxation rollers to reduce tension and allow the material to settle into a flat configuration before being fixed to the cover sheets. This sequence ensures the material achieves maximum volume while maintaining flatness during the fixation process
Solution Approach 2:
The patent employs dynamics by using relaxation rollers that dynamically adjust and reduce tension in the expanded slit-sheet material. The rollers progressively relax the material from a fully expanded high-tension state to a partially relaxed low-tension state, allowing the material to naturally settle into a flat configuration before fixation occurs
2Volume of moving object
If slit-sheet material is expanded to increase volume, then the material achieves desired cushioning properties, but the material becomes prone to warping and twisting
Solution Approach 1:
The patent applies preliminary action by expanding the slit-sheet material to a fully expanded state before fixation, then using relaxation rollers to reduce tension and allow the material to settle into a flat configuration before being fixed to the cover sheets. This sequence ensures the material achieves maximum volume while maintaining flatness during the fixation process
Solution Approach 2:
The patent employs parameter changes by controlling the tension parameter in the slit-sheet material through the relaxation rollers. The rollers progressively reduce tension from a high state (fully expanded) to a low state (partially relaxed), enabling the material to stabilize in a flat configuration while maintaining increased volume and cushioning properties
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 machine produces a flat, expanded dunnage pad with increased volume and decreased density, suitable for insulation or packaging, while avoiding the curling issues associated with fully expanded material.
Implementation Method 1
the expanding means creating tension in the slit-sheet material transverse the width dimension downstream of the advancing means to cause the slits to open to a fully-expanded state
Implementation Method 2
the reducing means reducing the tension in the slit-sheet material downstream of the expanding means to cause the slits to relax from the fully-expanded state to a partially-expanded state
Data Source
AI summary
A dunnage conversion machine includes (i) a pair of gripping rollers configured to rotate at a first rotational speed to advance a slit-sheet material in a downstream direction; (ii) a pair of expansion rollers configured to rotate at a second rotational speed, faster than the first rotational speed, creating a stretching force on the slit-sheet material and further advancing the slit-sheet material, causing expansion of the slit-sheet material to a fully expanded state; and (iii) a pair of relaxation rollers configured to rotate at a third rotational speed, slower than the second rotational speed, reducing the stretching force and further advancing the slit-sheet material, allowing the slit-sheet material to relax to a partially expanded state. The pair of relaxation rollers (iii) also are configured to capture the slit-sheet material in the partially expanded state between a top cover sheet and a bottom cover sheet to form a dunnage pad.