Laminated Metal Sheet Orientation Control for Continuous Packaging Production
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Solution Overview
Problem
Existing methods for producing laminated metal sheets with polyester laminate layers struggle with residual orientation issues, leading to inadequate formability, corrosion resistance, and appearance, and require costly, time-consuming quality control methods that are not suitable for continuous production.
Innovation Solution
A method using ATR-FTIR spectroscopy to measure the Euclidean distance matrix between spectra of the laminate layer before and after lamination, adjusting process parameters to achieve a low residual orientation by post-heating and cooling, ensuring a controlled orientation in the laminate layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniaxial stretching is used to produce MDO laminate layers, then the laminate layer shows strong orientation of polymer chains in the stretching direction, but the stability in terms of wrinkling and shrinking during lamination is reduced
Solution Approach 1:
The patent applies heat setting treatment to the MDO laminate layer, changing the thermal parameter to reduce residual orientation and improve dimensional stability. By controlling the heat setting temperature and duration, the patent achieves a balance between maintaining polymer chain orientation for mechanical properties and reducing shrinkage/wrinkling during lamination.
2Reliability
If heat setting is applied to MDO laminate layers, then the stability during lamination is improved, but the production cost increases and integration with continuous production becomes impractical
Solution Approach 1:
The patent combines the heat setting treatment with the lamination process by applying heat during the lamination step itself. This merging of operations allows the MDO laminate layer to be stabilized and laminated in a single continuous process, eliminating the need for separate heat setting equipment and enabling continuous production while maintaining dimensional stability.
Solution Approach 2:
The patent applies a preliminary heat treatment to the MDO laminate layer before lamination to reduce residual orientation and improve dimensional stability. This preliminary action prepares the laminate layer for subsequent lamination without requiring separate heat setting equipment, enabling continuous production while maintaining stability.
3Manufacturing precision
If residual orientation is not reduced sufficiently in the laminate layer, then the formability, corrosion resistance and appearance of the laminated metal sheet become inadequate, but reducing residual orientation through heat bonding increases production complexity
Solution Approach 1:
The patent optimizes the heat setting parameters (temperature, duration, and timing) to reduce residual orientation to acceptable levels without requiring excessive process complexity. By carefully controlling these parameters, the patent achieves adequate formability, corrosion resistance, and appearance while maintaining a practical production process.
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
Enables rapid determination of residual orientation, reducing rejected materials and ensuring high-quality laminated metal sheets with uniform properties, suitable for continuous production.
Implementation Method 1
an Euclidean distance matrix D between a first and a second ATR-FTIR spectrum of the laminate layer (3a) has a value of at least 0.20
Implementation Method 2
the ATR-FTIR spectra are measured in the spectral range which includes the range of 1160 to 1520 cm−1
Implementation Method 3
heat bonding the laminate layer to the metal sheet
Implementation Method 4
followed by annealing (heat setting) stage to avoid shrinkage of the laminate layer during the lamination onto the metal sheet
Data Source
AI summary
A method of producing a laminated metal sheet for packaging applications and laminated metal sheet for packaging applications produced thereby.