Semi-Corrugated Paperboard Panels with Matrix Pattern
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Solution Overview
Problem
The corrugated packaging industry faces challenges in reducing the basis weight of liners and mediums while maintaining the strength of corrugated boards, as very lightweight materials are prone to failure in high-speed manufacturing processes, and there is a need for alternative approaches beyond continuous reduction in paper basis weights to match packaging requirements.
Innovation Solution
The modification of corrugating rolls with slots and creasing tools to form a matrix pattern in the medium, allowing for the creation of semi-corugated boards with fewer plies, such as 2-ply or 4-ply configurations, which provide equivalent or superior strength to conventional 3-ply or 5-ply boards with reduced fiber content, achieved by eliminating the top liner and using creases to form cross flute bond lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the basis weight of liners and mediums is reduced to lower costs and environmental impact, then fiber usage and production costs decrease, but the strength and reliability of corrugated boards deteriorate
Solution Approach 1:
The patent applies composite materials by combining fluted medium with creased bond lines formed through slots and creasing tools in corrugating rolls. This creates a hybrid structure where the fluted geometry provides cushioning and the creased bond lines provide structural reinforcement, achieving equivalent strength to traditional heavier boards with reduced fiber content
Solution Approach 2:
The corrugating rolls are segmented with slots and creasing tools that create discrete bond lines at specific locations. This segmentation allows strategic reinforcement only where needed for structural integrity, rather than uniformly increasing basis weight across the entire board, thus reducing overall fiber usage while maintaining strength
2Loss of substance
If very lightweight liners and mediums are used to reduce fiber content, then ecological impact decreases, but the materials fail to withstand high-speed manufacturing processes
Solution Approach 1:
The slots and creasing tools in the corrugating rolls create preliminary reinforcement structures (crease patterns) in the medium during the flute formation process itself. This preliminary action strengthens the lightweight medium before it undergoes subsequent high-speed manufacturing operations, preventing failure while maintaining low fiber content
3Strength
If conventional corrugated boards with multiple plies are used to ensure strength, then packaging reliability improves, but fiber consumption and production costs increase
Solution Approach 1:
The patent transitions from a conventional planar multi-ply structure to a three-dimensional fluted structure with creased bond lines. The fluted geometry adds vertical dimension and structural complexity, providing enhanced strength and cushioning properties that compensate for reduced fiber content and fewer plies
Data Source
AI summary
A means of making a multi ply structural panel by eliminating the top liner in the corrugating process. The present invention is made possible through modification to the corrugating rolls of the singlefacer. The design modification to the rolls involves incorporation of slots that run around the circumference of one roll and mating creasing tools incorporated around the circumference of the other of the corrugated roll set. These slots and creasing tools are incorporated across the existing flutes of the corrugating rolls.