Microperforated Label Patches for MAP Gas Permeability Control
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Solution Overview
Problem
Current methods for achieving precise control of gas permeability in modified atmosphere packaging (MAP) for fresh produce are costly, inflexible, and inefficient, particularly when dealing with high-respiration items like broccoli and sugar snap peas, and often result in anaerobic conditions due to temperature abuse, leading to unpleasant odors and microbiological safety issues.
Innovation Solution
A method for producing microperforated patches with defined O2 flux rates using lasers or mechanical drills on standard label stock, allowing for easy and precise adjustment of gas permeability, applicable to both flexible and rigid packaging, which can be applied continuously without significant production line changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If gas-impermeable barrier packaging is used to seal fresh produce, then oxygen transmission is blocked and packaging simplicity is improved, but internal gas percentages shift over time due to respiration and optimal atmosphere cannot be maintained
Solution Approach 1:
The patent applies microporous patches with controlled pore sizes (0.1-10 micrometers) to packaging materials. These patches allow selective gas permeability where oxygen transmission rate can be precisely controlled to match produce respiration rates, while maintaining structural integrity and simplicity of the overall packaging system.
Solution Approach 2:
The patent changes the permeability parameter of the packaging by incorporating microporous patches with specific oxygen transmission rates (OTR) and carbon dioxide transmission rates (CO2TR). These parameters are adjusted to match the respiration characteristics of different produce types, enabling dynamic adaptation without complex packaging structures.
2Ease of manufacture
If low barrier non-porous packaging materials are used, then gas permeability is reduced and packaging cost is lowered, but oxygen transmission rate is insufficient for high respiration rate produce and anaerobic conditions occur
Solution Approach 1:
The patent creates a composite packaging system by combining standard non-porous packaging materials with microporous patches. This composite structure maintains the cost-effectiveness and manufacturing simplicity of conventional packaging while adding the necessary gas exchange capability through the microporous layer, preventing anaerobic conditions in high respiration produce.
3Quantity of substance
If microporous material is used to provide gas permeability, then oxygen transmission is improved and produce freshness is extended, but material cost increases and production complexity increases
Solution Approach 1:
The patent segments the packaging system by using microporous patches applied only to specific areas where gas exchange is needed, rather than making the entire packaging material microporous. This segmentation reduces the amount of expensive microporous material required and simplifies production by allowing the use of conventional packaging materials for the bulk of the structure.
Solution Approach 2:
The patent applies microporous properties locally to specific patches on the packaging surface rather than throughout the entire packaging material. This local quality approach provides gas permeability exactly where needed for produce respiration while maintaining the simplicity and cost-effectiveness of conventional packaging materials in other areas.
4Reliability
If microperforations are made in packaging material, then gas exchange is enabled and atmosphere control is improved, but production line complexity increases and manufacturing precision requirements increase
Solution Approach 1:
The patent replaces mechanical drilling or punching systems with thermal or laser-based methods for creating microporous patches. This substitution reduces manufacturing precision requirements and simplifies production lines, as thermal and laser methods can create consistent micropores without the complexity of precision mechanical positioning 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
This approach reduces production costs and provides precise control over gas exchange, preventing anaerobic conditions and extending the shelf life of fresh produce by maintaining optimal gas concentrations within the packaging.
Implementation Method 1
A method for producing microperforated patches with defined O2 flux rates using lasers or mechanical drills
Implementation Method 2
the concentrations of gases, especially oxygen and carbon dioxide, that surround the produce while it is contained in packaging are altered
Implementation Method 3
the gas permeability of MAP packaging must be precisely controlled
Data Source
AI summary
An apparatus and method for producing microperforated patches for MAP includes drilling or punching microperforations through continuously advancing label stock. Holes can be drilled by at least one microperforating laser traversed across the label stock as it advances, a laser beam deflected or split using a servo-driven galvanometer, beam splitters, or a plurality of mirrors, or by drills mounted into a rotating die cylinder across which the stock passes as it is advanced. Numbers and sizes of microperforations can be adjusted by manipulation of laser control parameters, or by exchange of die cylinders. The laser can be a CO2 laser with between 10 W and 100 W output. The drills can be carbide drills. The label stock is typically 6-18 inches wide, and can include an adhesive covered by a release sheet. The stock to be microperforated can include separate rows of labels or can be suitable for die-cutting after microperforation.