MDO Film Core Composition for Scuff Resistance and Conformability
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Solution Overview
Problem
The increasing demand and costs of Ethylene Vinyl Acetate (EVA) in MDO films lead to a need for alternative materials that can maintain desirable properties like scuff resistance and clarity while reducing EVA content, as higher polyethylene levels typically compromise scuff resistance.
Innovation Solution
The development of MDO films with a core layer composition comprising a blend of polyethylene and polypropylene, allowing for higher polyethylene content without sacrificing scuff resistance, enhanced printability, and improved laser die cuttability, achieved through specific polymeric blends and surface treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If higher levels of polyethylene are used in MDO films, then conformability is improved, but scuff resistance deteriorates
Solution Approach 1:
The patent applies local quality by creating a multilayer film structure where the core layer contains higher polyethylene content (improving conformability) while the skin layers contain lower polyethylene content (maintaining scuff resistance). This spatial differentiation of material properties allows each layer to perform its specific function optimally without compromising the other.
Solution Approach 2:
The patent uses composite materials by combining multiple polymer layers with different compositions - specifically a core layer with high polyethylene content blended with other polymers, and skin layers with different composition. This composite structure enables the film to simultaneously achieve high conformability from the polyethylene-rich core and high scuff resistance from the protective skin layers.
2Ease of manufacture
If EVA content is reduced in MDO films, then cost is improved, but scuff resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the film layers - reducing or eliminating EVA content in favor of alternative polymer blends in the core layer, while adjusting skin layer composition to maintain scuff resistance. This allows cost reduction through material substitution while preserving critical performance properties.
Solution Approach 2:
The patent uses composite materials to replace EVA with alternative polymer combinations in the core layer that provide similar or improved performance at lower cost, while the skin layers provide the necessary protective properties. This composite approach allows decoupling of cost-reduction goals from performance-maintenance goals.
3Ease of manufacture
If polyethylene content is increased to reduce EVA costs, then manufacturing cost is improved, but printability deteriorates
Solution Approach 1:
The patent applies local quality by concentrating the high polyethylene content in the core layer where cost reduction is prioritized, while keeping the skin layers with composition optimized for printability. This localized optimization allows the bulk material to be cost-effective while the surface maintains printing capabilities.
Data Source
AI summary
Compositions which are well suited for forming into machine direction orientation (MDO) films are described. Multilayer films containing one or more layers of the compositions and/or films are also described. Additionally, label assemblies utilizing the multilayer films, labeled substrates, and related methods are described. Various versions of the multilayer films are described including films having at least two skin layers and an interior core layer. Particular multilayer films are described having polyethylene rich cores.