Dunnage Forming Assembly With Adjustable Guides to Prevent Tearing
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Solution Overview
Problem
Conventional dunnage conversion machines struggle to efficiently convert sheet stock materials into lower-density cushioning products with improved cushioning properties, often requiring complex forming assemblies that can lead to tearing and increased machine size.
Innovation Solution
A forming assembly for a cushioning conversion machine that shapes and crumples sheet stock material with inwardly turned lateral regions, connected by a narrow central band, using a forming device with wedge-shaped protrusions and adjustable guide members to create a lower-density, crumpled strip, followed by a severing assembly to form discrete cushioning products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional forming assemblies are used to convert sheet stock material into lower-density dunnage, then the cushioning properties are improved, but the machine size increases and the risk of material tearing increases
Solution Approach 1:
The forming device is divided into multiple functional zones: a compression zone with vertically-spaced compression members for compressing the sheet material, and a crumpling zone with laterally-spaced crumpling members for creating random crumples. This segmentation allows each zone to perform its specific function efficiently without requiring a monolithic complex structure, thereby improving cushioning properties while controlling machine size.
Solution Approach 2:
Different regions of the forming device apply different types of deformation locally: the compression members apply vertical compression to reduce density, while the crumpling members create lateral random crumples for cushioning. This local differentiation of deformation modes optimizes cushioning properties in specific areas without requiring the entire machine to be oversized, resolving the contradiction between reliability and device complexity.
2Reliability
If complex forming assemblies are used to convert sheet stock material, then cushioning properties are improved, but the risk of material tearing increases
Solution Approach 1:
The forming process is segmented into distinct compression and crumpling zones with different deformation mechanisms. The compression members first reduce material density through vertical compression, then the crumpling members create gentle lateral random crumples. This segmented approach avoids the high localized stresses that cause tearing in complex single-zone forming assemblies, thereby improving cushioning properties while maintaining material integrity.
Solution Approach 2:
Instead of applying complex multi-directional forces simultaneously as in conventional forming assemblies, this invention inverts the approach by applying unidirectional compression first, followed by gentle lateral crumpling. This reversed sequence of deformation modes reduces material stress and prevents tearing while still achieving improved cushioning properties.
3Reliability
If sheet stock material is converted into lower-density dunnage product, then cushioning performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The manufacturing process is segmented into two simple, distinct stages: compression by vertically-spaced members and crumpling by laterally-spaced members. Each stage uses a straightforward deformation mechanism that is easy to manufacture and maintain, avoiding the need for complex integrated forming mechanisms. This segmentation improves cushioning performance while keeping manufacturing complexity low.
Solution Approach 2:
The invention achieves lower-density dunnage with improved cushioning performance by changing the physical parameters of the sheet material through controlled compression and crumpling. The compression members reduce density by applying vertical pressure, while the crumpling members create random structural configurations that enhance cushioning. These parameter changes are achieved through simple mechanical means, improving performance without increasing manufacturing complexity.
Data Source
AI summary
A cushioning conversion machine converts a sheet stock material into a relatively lower-density cushioning dunnage product. An exemplary sheet stock material includes two sheets that each overlap a common side of another sheet and are connected to respective lateral edges of the other sheet. The conversion machine includes a forming assembly having a former for shaping and randomly crumpling the sheet material, a set of adjustable guide members to guide the crumpled sheet material to a feeding assembly downstream of the forming assembly, and a severing assembly downstream of the feeding assembly that separates discrete lengths of cushioning. The severing assembly includes a window frame passage that guides the crumpled sheet material to an outlet during operation of the feeding assembly and constrains the crumpled sheet stock material during operation of the severing assembly.