Dunnage Sheet Expansion Assembly for Compact High-Yield Dispensing
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Solution Overview
Problem
Existing dunnage conversion apparatuses are not ideal for all applications, particularly in terms of compactness, ease of use, and efficiency in producing expanded dunnage products with cushioning and void-fill characteristics.
Innovation Solution
A dunnage conversion apparatus that includes a frame, a supply support, and first and second expansion members, driven by a drive assembly to expand and dispense pre-slit sheet material, allowing for controlled expansion and dispensing of an expanded dunnage product, with features like a drive member that biases towards the supply support and expansion members that apply consistent gripping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If existing dunnage conversion apparatuses are used, then adequate dunnage product is produced, but the apparatus is not compact and occupies excessive volume for transport and storage
Solution Approach 1:
The apparatus employs a compact nested structure where the drive member is positioned within the frame and can be retracted into a disengaged position within the frame's internal space. The expansion members rotate within the frame boundaries, and the supply support is integrated into the frame structure. This nesting arrangement allows the apparatus to occupy minimal volume while maintaining full operational capability for expanding sheet material into dunnage product.
2Ease of operation
If existing dunnage conversion apparatuses are used, then dunnage product is produced, but the apparatus is difficult to load with sheet material and operate
Solution Approach 1:
The drive member is designed with dynamic positioning capability, allowing it to move between an operating position where it engages the supply support for material loading and a disengaged position for operation. This dynamic adjustment simplifies the loading process by enabling the drive member to be positioned optimally for sheet material insertion, then retracted to avoid interference during the expansion and dispensing operation.
3Productivity
If the drive member is always engaged with the supply support, then sheet material can be dispensed, but the apparatus cannot be easily loaded with sheet material
Solution Approach 1:
The drive member is designed with dynamic positioning capability, allowing it to move between an operating position where it engages the supply support for material loading and a disengaged position for operation. This dynamic adjustment simplifies the loading process by enabling the drive member to be positioned optimally for sheet material insertion, then retracted to avoid interference during the expansion and dispensing operation.
Solution Approach 2:
The drive member is biased toward the supply support by gravity, automatically positioning itself in the operating position ready for material loading. This preliminary positioning action eliminates the need for manual adjustment before loading, as the drive member is already in the correct position to engage the sheet material supply when material is inserted.
4Reliability
If expansion members apply strong gripping force, then sheet material expands reliably, but the apparatus becomes more complex
Solution Approach 1:
The expansion members are designed to automatically apply gripping force to the sheet material through their rotational movement and geometric configuration. As the expansion members rotate about their axes, their shape and position naturally create the necessary gripping force to expand the material without requiring additional active control mechanisms. The system uses the inherent motion of the expansion members themselves to generate the expanding force, eliminating the need for separate actuators or complex control systems.
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 apparatus enables rapid production of an expanded dunnage product with improved yield and performance, occupying a reduced volume for transport and storage, and is easy to load with unexpanded sheet material.
Implementation Method 1
first and second expansion members downstream of the supply support to apply a gripping force to the sheet material as it is drawn from the supply in a feed direction through the expansion members
Implementation Method 2
When the slit sheet paper is stretched in a direction transverse the direction of the slits, the paper deforms, increasing in length and thickness. This stretching and increase in thickness, and volume, more particularly, of the slit sheet paper packing material is referred to as expansion.
Implementation Method 3
The drive member in the operating position is biased toward the supply support. The drive assembly may be configured such that drive member in the operating position is biased toward the supply support by gravity.
Data Source
AI summary
A dunnage conversion assembly includes a supply of expandable sheet material and a dunnage conversion apparatus configured to expand the expandable sheet material. The apparatus includes a frame, a supply support mounted to the frame to support a supply of sheet material, and first and second expansion members rotatably mounted to the frame downstream of the supply support to receive the sheet material therebetween. At least one of the first expansion member or the second expansion member is rotatably driven. A drive assembly of the apparatus includes a drive member and a motive device that drives rotation of the drive member to dispense the sheet material from the supply. The drive member is movable between an operating position adjacent the supply support and a disengaged position spaced from the supply support. The drive member in the operating position is biased toward the supply support.