Laminated Packaging Material With Hinged Slits and Bridges
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Solution Overview
Problem
Existing laminated packaging materials for liquid food products face challenges in ensuring consistent and reliable sealing of opening structures while maintaining manufacturing quality and efficiency, particularly in high-speed packaging processes, while also requiring controlled penetration force for consumer convenience.
Innovation Solution
A laminated packaging material with slits forming a partially cut opening, featuring a hinge portion and a bridge area, ensures the bulk layer remains flat during manufacturing, allowing easy penetration with controlled force and maintaining robustness, using a bulk layer of paper or paperboard with outer and inner liquid-tight layers, and optionally a barrier film or sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-laminated hole is provided to reduce penetration force, then ease of opening is improved, but lamination quality and sealing reliability deteriorate due to structural weakness at the hole location
Solution Approach 1:
The opening structure is segmented into multiple functional zones: hinge portions for folding, bridge portions for controlled breaking, and slit portions for penetration. This segmentation allows each zone to perform its specific function while maintaining overall structural integrity and lamination quality.
Solution Approach 2:
Different regions of the packaging material are given different structural properties. The hinge portions have high flexibility for folding, the bridge portions have controlled strength for breaking, and the slit portions provide penetration paths. This local differentiation resolves the contradiction between ease of opening and sealing reliability.
2Productivity
If continuous tube forming is used for high-speed packaging, then productivity is improved, but manufacturing precision of opening structures deteriorates
Solution Approach 1:
The opening structures (hinge portions, bridge portions, slit portions) are pre-formed in the packaging material before the lamination process. This preliminary action ensures that the opening structures are already in their correct positions and configurations when the material is laminated, maintaining manufacturing precision even during continuous high-speed production.
3Ease of operation
If opening structure is provided with reduced mechanical robustness, then ease of opening is improved, but unintentional penetration and packaging integrity deteriorate
Solution Approach 1:
The packaging material has different mechanical properties in different locations. The hinge and bridge portions have reduced robustness for controlled opening, while the bridge area and other intact regions maintain full strength to prevent unintentional penetration. This local differentiation resolves the contradiction between ease of opening and packaging integrity.
Solution Approach 2:
The opening structure is divided into functional segments (hinge portions, bridge portions, slit portions) that are designed to fail in controlled ways during intended opening, while the remaining structure maintains its full strength to prevent accidental compromise of packaging integrity.
Data Source
Figure 1A
Figure 1B
Figure 2AI~2AV
AI summary
A laminated packaging material (16) for packaging of liquid food products is provided. The laminated packaging material comprises a bulk layer 20 provided with at least two slits (22) forming a partially cut opening and being arranged along a boundary of a closed shape defining the partially cut opening. The boundary of the closed shape comprises at least one hinge portion (42) and a bridge area (43) comprising at least one bridge portion (44) separating the at least two slits (22).