Removable Skin Layer Film Stack Haze Warning

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional film stacks with overlaminate layers face challenges in handling and installation due to their thin, highly conformable nature, and the removal of protective skin layers can damage the surface, while existing solutions require additional adhesive layers and complex manufacturing processes.

Innovation Solution

A film stack design featuring a transparent base overlaminate film with a removable skin layer that is more rigid than the base layer, allowing for stretchability up to 30% without irreversible damage, and providing a visible haze indication before reaching the damage point, eliminating the need for separate adhesive layers and simplifying the manufacturing process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a removable skin layer is added to protect the overlaminate surface, then surface protection and handling ease are improved, but device complexity and manufacturing complexity increase

Engineering Contradiction:

Improvehandling easeVSAvoidstructure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent combines the protective skin layer and the overlaminate film into a single integrated structure with the skin layer laminated directly to the overlaminate. This merging eliminates the need for separate protective layers while maintaining surface protection and handling ease.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The skin layer serves multiple functions simultaneously: it provides surface protection during handling and installation, acts as a release layer for easy removal, and offers visual indication through haze formation. This multi-functionality reduces the need for additional separate components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the overlaminate film is made thin and highly conformable for better application, then adaptability is improved, but strength and resistance to damage during handling worsen

Engineering Contradiction:

ImproveconformabilityVSAvoiddamage resistance

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent creates a composite structure where a thin, conformable overlaminate film is combined with a more rigid skin layer. The skin layer provides mechanical strength and damage resistance during handling, while the thin overlaminate maintains conformability for application to curved surfaces. The layers are laminated together to function as an integrated system.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The skin layer is positioned specifically on the outer surface where mechanical protection is needed during handling and installation. This localized reinforcement provides strength where required without affecting the conformability of the underlying thin overlaminate film.

Inventive Principle:

Principle #3Local quality

3Strength

If adhesive layers are added to secure the overlaminate, then bonding strength is improved, but device complexity and manufacturing complexity increase

Engineering Contradiction:

Improvebonding strengthVSAvoidmanufacturing complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent merges the adhesive function into the skin layer itself, which is laminated to the overlaminate film. This integrated approach eliminates the need for separate adhesive layers while maintaining secure bonding. The lamination process itself provides the bonding mechanism.

Inventive Principle:

Principle #5Merging (Combining)

4Adaptability or versatility

If the film is stretched beyond a certain point to achieve proper fit, then adaptability is improved, but the risk of irreversible damage increases

Engineering Contradiction:

ImprovestretchabilityVSAvoidintegrity maintenance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The skin layer is designed to undergo a visual change (haze formation) when stretched to a predetermined extent. This color/optical property change serves as a warning indicator to the installer, allowing them to stop stretching before irreversible damage occurs to the overlaminate film. The haze formation provides real-time feedback on the stretching state.

Inventive Principle:

Principle #32Color changes

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

The film stack is easier to handle and install, with the removable skin layer providing a visual warning of impending damage, ensuring the base overlaminate layer's optical and physical integrity is preserved, and allowing for secure attachment and easy removal without surface damage.

Implementation Method 1

the removable skin layer—when the film in stretched—becomes hazy before causing irreversible damage to the base overlaminate film layer

Methodology Applied

Scientific EffectHaze formation:

Data Source

PatentUS20230193082A1Film stack with overlaminate film layer and removable skin layer

Publication Date: 2023.06.22 3M INNOVATIVE PROPERTIES CO

AI summary

Film stacks are described. In particular, film stacks including a base overlaminate film layer and a removeable skin layer disposed on the base overlaminate film layer are described. Because the removable skin layer develops haze before the point of irreversibly damaging the base overlaminate layer, the film stack can prevent unintentional overstretching when the film stack is stretched together.