Embossing Rollers Phased for Thermal Expansion Alignment
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Solution Overview
Problem
Existing embossing and embossing-laminating devices face issues due to differential thermal expansions of embossing rollers, leading to misalignment of embossing patterns and poor bonding of plies, particularly in tip-to-tip and nested embossing techniques.
Innovation Solution
The embossing-laminating device employs two embossing rollers with distinct temperature settings, ensuring that the embossing patterns on each roller remain in phase despite differential thermal expansion by adjusting the bearings to allow differential thermal expansion, particularly in the axial direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate embossing and lamination processes are used, then functional requirements can be met, but production time increases and productivity decreases
Solution Approach 1:
The patent combines the embossing process and lamination process into a single integrated operation. The embossing unit and lamination unit are arranged in series within one processing station, allowing the film to undergo both embossing and lamination simultaneously in one pass, thereby reducing production time while maintaining functional requirements.
Solution Approach 2:
The patent transitions from sequential processing (separate embossing and lamination steps) to simultaneous processing by adding the embossing function to the existing lamination line. This dimensional change in the process flow allows both operations to occur in the same time frame, improving productivity without sacrificing quality.
2Productivity
If embossing and lamination are combined in one process, then productivity increases, but uniformity of lamination and embossing quality becomes difficult to maintain
Solution Approach 1:
The patent divides the combined process into distinct functional units: an embossing unit with heated rollers and a lamination unit with separate heated rollers. Each unit operates independently with its own temperature control and pressure parameters, allowing precise control of each process while maintaining their integration in a single production line.
Solution Approach 2:
The embossing rollers and lamination rollers are equipped with independent heating systems and temperature controls, allowing each section to be optimized for its specific function. This local quality control ensures uniform embossing patterns and consistent lamination quality throughout the production process.
3Manufacturing precision
If embossing is performed before lamination, then embossing quality improves, but the film may deform during subsequent lamination heating
Solution Approach 1:
The embossing process is performed first on the film before lamination, creating the desired surface pattern while the film is still in its initial state. The embossed film then proceeds to the lamination unit where it is heated and bonded, with the embossed features already established and protected during the lamination process.
Solution Approach 2:
The patent uses a cooling section between the embossing and lamination units to stabilize the film temperature and prevent excessive deformation during lamination. This intermediate cooling step cushions the film against thermal stress, maintaining embossing quality while enabling successful lamination.
4Productivity
If multiple processing steps are integrated, then productivity increases, but device complexity increases
Solution Approach 1:
The patent designs the processing line with multi-functional units that can perform multiple operations. The embossing unit and lamination unit are integrated into a single production line that can process different film types and configurations, reducing the need for separate dedicated equipment and minimizing overall system complexity.
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 solution ensures that the embossing patterns on the plies remain aligned and bonded correctly, preventing waste and improving the quality of the finished product even when the rollers are at different operating temperatures.
Implementation Method 1
a heating unit configured to heat the film to a temperature suitable for lamination
Implementation Method 2
an embossing unit configured to emboss a pattern onto the heated film
Implementation Method 3
a laminate, and the laminate adhering to the embossed pattern
Data Source
Figure 1~2B
Figure 3~4
Figure 5~6
AI summary
The embossing-laminating device comprises a first embossing roller provided with first embossing protuberances forming a first embossing pattern. The first embossing roller co-acts with a first pressure roller forming, with the first embossing roller, a first embossing nip. The embossing-laminating device further comprises a second embossing roller provided with second embossing protuberances forming a second embossing pattern. The second embossing roller co-acts with a second pressure roller defining, with the second embossing roller, a second embossing nip. A heating device heats the first embossing roller to make the first embossing roller achieve, in use, a first temperature higher than a second temperature of the second embossing roller. The first embossing pattern and the second embossing pattern are so configured as to be in phase with each other when the first embossing roller is at the first temperature and the second embossing roller is at the second temperature.