Laminated Glass Laser Separation Edge Quality
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Solution Overview
Problem
Existing methods for cutting laminated glass panels using laser technology often result in poor break edge quality due to compressive stress from decomposition products of the composite film, leading to shelling and rejection of the glass panes.
Innovation Solution
The method involves creating a focal track with open access routes for decomposition products to escape, using a laser beam to weaken and decompose the film structure, allowing gases to escape and reducing compressive stress, which promotes crack propagation and improves edge quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser beam is used to heat and decompose the composite film between laminated glass panes, then the film structure is weakened and separation is enabled, but decomposition products build up high pressure causing compressive stress that prevents crack propagation and degrades edge quality
Solution Approach 1:
The patent introduces channel structures that segment the sealed edge area into multiple regions, allowing decomposition products to be distributed and channeled toward designated outlet openings. This segmentation prevents pressure buildup in any single area, enabling crack propagation to proceed through the glass pane without being blocked by compressive stress, thereby maintaining breaking edge quality
Solution Approach 2:
The patent introduces channel structures as intermediary elements between the decomposing film material and the external environment. These channels serve as conduits that transport decomposition products from the sealed edge area to outlet openings, mediating the pressure release process and preventing compressive stress from building up to levels that would inhibit crack propagation
2Reliability
If decomposition products are sealed between laminated glass panes to prevent oxidation, then the film material is protected from burning, but high pressure builds up counteracting crack propagation and causing shelling
Solution Approach 1:
The patent applies different functional characteristics to different regions of the sealed edge area. The majority of the edge area maintains sealing to protect against oxidation, while specific localized regions incorporate channel structures and outlet openings that allow controlled pressure release. This local differentiation enables both protection from oxidation and prevention of excessive pressure buildup
3Ease of manufacture
If laser beam focal track is created in the composite film, then the film is weakened for separation, but adjacent glass material is heated and placed under compressive stress impairing break edge quality
Solution Approach 1:
The patent extracts the harmful compressive stress from the system by providing pressure relief pathways through channel structures and outlet openings. This allows the laser beam to create the necessary focal track for film weakening without the adverse side effect of sustained compressive stress buildup, thereby maintaining break edge quality while preserving separation capability
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 enables the production of laminated glass panes with excellent breaking edge quality by reducing compressive stress and preventing overpressure, allowing for efficient separation without additional cooling steps.
Implementation Method 1
the laser beam from the upstream laser device heating the laminated film between the laminated glass panels in a linear manner
Implementation Method 2
decomposition products of the film material generated by the laser beam
Implementation Method 3
the heated areas are to be cooled with coolant, with cracks to be formed on the surface of the panes
Implementation Method 4
An ultrasonic device is then used to break the laminated glass panes along the surface cracks
Data Source
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AI summary
The invention relates to a process for separating at least one individual pane of predefined size and edge form from a laminated glass sheet, which has at least two laminated glass sheet panes which are arranged one above another in adjacent form and between which there is arranged a plastic film, which permanently bonds the laminated glass sheet panes to one another, wherein - a laser track channel which at least weakens the plastic structure of the plastic film is laid into the plastic film along predefined separating lines with the energy of a laser beam, e.g. of the focal point of a focussed laser beam or a parallel laser beam of adequate predefined energy, - the focal point is placed against an edge of the laminated glass sheet and the laser track channel is formed in such a manner that, as the laser process progresses, disintegration fluids arising from the plastic film can escape to the outside via the laser track channel, - then scored lines flush with the laser track channel are mechanically made in the two surfaces of the laminated glass sheet panes, and - then the glass material is broken along the scored lines by bending the laminated glass sheet or by the action of ultrasonic energy, and also to an apparatus for carrying out the process.