Plowing methods for separation of multilayer interlayers
By mechanically plowing the soft poly(vinyl butyral) layer from the stiff layer using heated devices, the process addresses the challenges of recyclability in multilayer interlayers, achieving effective separation and recovery of the skin layer for reuse.
Patent Information
- Application Number
- PCT/US2024/047013
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-09-19
- Filing Date
- 2024-09-17
- Publication Date
- 2025-03-27
AI Technical Summary
Multilayer interlayers, particularly those with soft and stiff poly(vinyl butyral) layers, pose challenges in recyclability due to differences in physicochemical properties, leading to incomplete mixing during extrusion and resulting in haze, which limits the content of recycled material.
The process involves mechanically plowing or scraping the soft poly(vinyl butyral) layer from the stiff poly(vinyl butyral) layer using heated plowing devices, allowing for the separation of layers and recovery of the skin layer for reuse in extrusion.
This method effectively separates the soft and stiff layers, enabling the recovery of the skin layer with minimal residue, thus enhancing the recyclability and reducing economic losses associated with the limited recyclability of multilayer interlayers.