Tapered Multilayer Interlayer Separation Without Wrinkling or Tearing

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Solution Overview

Problem

Multilayer interlayers, particularly tapered or wedge-shaped interlayers used in HUD systems, face challenges in recyclability due to differing physicochemical properties of layers, leading to haze formation and limited reworkability, resulting in economic loss and environmental burden.

Innovation Solution

A continuous process involving heating and separating the layers of a tapered multilayer interlayer sheet by pulling in different directions, with a positioning roll tilted in the Z and/or Y direction to prevent the thicker side from shifting during separation, maintaining specific angles to ensure effective layer separation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multilayer interlayer materials are added back into the skin layer extrusion process for recycling, then material reworkability is improved, but haze formation occurs due to immiscible core layer materials forming discrete domains

Engineering Contradiction:

ImprovereworkabilityVSAvoidhaze formation

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent segments the multilayer interlayer into separate layers (skin layer and core layer) through mechanical separation processes. This allows the skin layer to be recovered and reused in extrusion without contamination from the core layer material, eliminating haze formation while maintaining recycling benefits

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent extracts the core layer material from the multilayer structure through separation processes. By removing the immiscible core layer material, the skin layer can be recycled into extrusion processes without causing haze, thus enabling reworkability while preventing harmful effects

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of manufacture

If manual peeling is used to separate skin layer from multilayer sheet, then mechanical separation concept is demonstrated, but stability and consistency are insufficient

Engineering Contradiction:

Improvemechanical separation feasibilityVSAvoidseparation stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent replaces manual mechanical peeling with controlled thermal separation processes. By applying heat to reduce adhesion between layers and then using controlled mechanical forces, the process achieves stable and consistent separation while maintaining the feasibility of mechanical separation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes physical parameters (temperature, adhesion properties) to enable reliable mechanical separation. By heating the multilayer sheet to reduce interlayer adhesion and then applying controlled mechanical forces, the process achieves consistent separation results that manual peeling cannot provide

Inventive Principle:

Principle #35Parameter changes

3Productivity

If heating and pulling process is used for layer separation, then separation effectiveness is improved, but positioning control becomes challenging due to thicker side shifting

Engineering Contradiction:

Improveseparation efficiencyVSAvoidpositioning accuracy

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent introduces a counterbalancing force or positioning mechanism that counteracts the shifting tendency of the thicker side during separation. This allows the heating and pulling process to proceed efficiently while maintaining precise positioning control

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The patent implements a feedback control system that monitors the position of the thicker side during separation and adjusts the pulling forces or heating distribution accordingly. This maintains positioning accuracy while preserving the efficiency benefits of the heating and pulling process

Inventive Principle:

Principle #23Feedback

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

Facilitates stable and consistent mechanical separation of layers, enabling efficient rework and recycling of multilayer interlayers, reducing waste and enhancing economic viability.

Implementation Method 1

heating the tapered multilayer interlayer sheet to an elevated temperature

Methodology Applied

Scientific EffectHeating: Heating

Data Source

PatentUS20260042285A1Methods and devices for mechanical separation of multilayer tapered interlayers

Publication Date: 2026.02.12 SOLUTIA INC

AI summary

Processes are disclosed for separating a first layer from a remainder of a tapered multilayer interlayer sheet, in which the tapered multilayer interlayer sheet is heated, and thereafter the first layer is separated from the remainder of the tapered multilayer interlayer sheet by pulling the first layer and the remainder of the tapered multilayer interlayer sheet in different directions, in a defined orientation, without the tapered multilayer interlayer sheet wrinkling or tearing.