Laminated Pane Bus Bar PET Barrier Film for Edge Fading Control
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Solution Overview
Problem
Laminated panes with multiple electrically controllable functional elements face issues with edge fading due to plasticizer diffusion from intermediate layers and require time-consuming bus bar soldering and dust formation during assembly.
Innovation Solution
The use of PET films as both carrier films for bus bars and protective films for the edges of functional elements, with bus bars applied in advance on PET barrier films, allowing for edge sealing and reduced soldering and dust formation during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If functional elements are laminated with PVB intermediate layer, then acoustic function and dark tint are achieved, but edge fading develops quickly and continues after aging
Solution Approach 1:
A barrier film made of plasticizer-free PET is introduced as an intermediary layer between the PVB intermediate layer and the functional element. This barrier film prevents plasticizer diffusion from the PVB into the functional element's active layer, thereby preventing edge fading while allowing the PVB to maintain its acoustic and dark tint functions.
Solution Approach 2:
The patent segments the lamination structure by separating the PVB intermediate layer from the functional element with an additional barrier film layer. This segmentation isolates the plasticizer-containing PVB from the plasticizer-sensitive functional element, allowing each layer to perform its intended function without mutual interference.
2Adaptability or versatility
If multiple separate bus bars are soldered during assembly, then separate control of functional elements is achieved, but dust formation increases and assembly time increases
Solution Approach 1:
Bus bars are pre-applied to the carrier film during the functional element manufacturing process rather than during final assembly. This preliminary action allows bus bars to be positioned and prepared in advance, eliminating time-consuming on-site soldering operations and reducing dust formation during assembly while maintaining separate control capability for multiple functional elements.
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 minimizes edge fading, reduces the time and dust associated with bus bar application, and simplifies the assembly process by pre-applying bus bars on PET films, enhancing the reliability and efficiency of laminated pane production.
Implementation Method 1
The plasticizer or other chemical components of the intermediate layer can diffuse into the active layer via the open edge of the functional element... at least one barrier film that has, at least in some sections, a projection beyond the functional element is arranged between the functional element and the first intermediate layer and between the functional element and the second intermediate layer
Implementation Method 2
When no voltage is applied, the liquid crystals are oriented in a disorderly manner, resulting in strong scattering of the light passing through the active layer
Implementation Method 3
When a voltage is applied to the surface electrodes, the liquid crystals align themselves in one common direction and the transmittance of light through the active layer is increased
Data Source
AI summary
A laminated pane, includes an outer pane, an inner pane, and at least two intermediate layers, wherein at least two separate functional elements with electrically controllable optical properties are arranged in a plane between the two intermediate layers, wherein on two opposite sides of each functional element, an inner bus bar is connected in each case to the respective functional element and at least one of the two opposite sides of each functional element is sealed by two PET barrier films, which are partly arranged between an intermediate layer and the functional element, wherein attached on one of the PET barrier films is at least one outer bus bar that is connected via an electrically conducting connection to the inner bus bar of a functional element, in order to electrically control the functional element separately from the other functional element or elements.