Dunnage Conversion Machine Reduced-Crumpling Cutting Zone
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Solution Overview
Problem
The randomness of crumpling in dunnage conversion machines leads to loose shards of sheet material during cutting, causing jamming, waste, and operational issues.
Innovation Solution
A dunnage conversion machine with a conversion assembly that selectively reduces random crumpling in sheet stock material and includes a controller to activate a cutting assembly, cutting the material in a reduced-crumpling zone to minimize loose shards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sheet stock material is randomly crumpled to form dunnage product, then the dunnage product achieves the desired cushioning and packing function, but loose shards of sheet material are produced during cutting causing jamming and waste
Solution Approach 1:
The cutting process is segmented into two distinct phases: first cutting the crumpled dunnage product to separate individual pieces, then temporarily reducing crumpling and cutting the reduced-crumpling portion to sever discrete strips. This segmentation allows each cutting operation to occur under optimal conditions, preventing loose shard generation while maintaining dunnage functionality.
Solution Approach 2:
The system performs preliminary cutting of the crumpled dunnage product before the final severing operation. By first separating the crumpled portions and then cutting the reduced-crumpling portion, the system prepares the material in advance to prevent loose shard production during the final cutting stage.
2Stability of the object's composition
If continuous random crumpling is maintained throughout the sheet stock material, then the dunnage product maintains consistent cushioning properties, but cutting operations produce loose shards and increase waste
Solution Approach 1:
The crumpling characteristic is made local rather than uniform throughout the entire sheet. The conversion assembly creates distinct zones: a first portion with random crumpling for dunnage product formation, and a second portion with reduced crumpling for clean cutting. This local differentiation allows the system to maintain cushioning consistency in the dunnage portion while enabling waste-free cutting in the reduced-crumpling portion.
3Productivity
If the cutting blade cuts through randomly crumpled material, then discrete dunnage products can be severed, but loose shards build up causing jamming and operational interference
Solution Approach 1:
The conversion assembly dynamically adjusts the crumpling characteristic of the sheet stock material based on the operational phase. During the first cutting operation, random crumpling is maintained for dunnage formation. During the second severing operation, the assembly temporarily reduces crumpling to ensure clean cuts without loose shard production, thereby maintaining operational continuity and reliability.
Data Source
AI summary
A dunnage conversion machine converts a sheet stock material into a dunnage product that is relatively thicker and less dense than the stock material. The conversion machine includes a conversion assembly that draws the sheet stock material therethrough and randomly crumples at least a portion of the sheet stock material. Before severing a discrete dunnage product of a desired length from the substantially continuous length of sheet stock material, the conversion assembly temporarily advances the sheet stock material therethrough while minimizing or eliminating the random crumpling of the sheet stock material in a reduced-crumpling zone, and then cuts the sheet stock material in the reduced-cutting zone to reduce or eliminate the production of scrap shards of sheet stock material.