Multilayer Blown Film Segmentation for Sealing and Processability
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Solution Overview
Problem
Existing multilayer blown film technologies face challenges in achieving suitable sealing and packaging properties without compromising processability and machinability, as low crystalline polymer materials used in sealant skin layers can hinder film blowing and processing.
Innovation Solution
A 5-layer blown film formulation is developed, featuring a high crystalline material in the sealant skin layer and a low crystalline material in the subskin layer, with specific weight percentages of ethylene copolymers and a propylene-based elastomer, optimizing sealing and packaging properties while maintaining processability and machinability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If low crystalline polymer material is used in the sealant skin layer to improve sealing and packaging properties, then sealing strength and packaging performance are improved, but film blowing and processing become hindered
Solution Approach 1:
The film is divided into multiple layers with distinct functions: the skin layer uses high crystalline material for processability, while the subskin layer uses low crystalline material for sealing strength. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
Different crystalline properties are assigned to different layers of the film structure. The skin layer has high crystalline content for ease of processing, while the subskin layer has low crystalline content for enhanced sealing, creating local quality variations that resolve the contradiction.
2Ease of manufacture
If high crystalline material is used in the sealant skin layer to improve processability and machinability, then film blowing and processing are facilitated, but sealing and packaging properties are compromised
Solution Approach 1:
The film structure is segmented into functional layers where the skin layer provides processability through high crystalline material, while the subskin layer provides sealing properties through low crystalline material, eliminating the need to compromise either property in a single layer.
Solution Approach 2:
The multilayer film combines materials with different crystalline properties in a composite structure, where high crystalline material in the skin layer ensures processability while low crystalline material in the subskin layer ensures sealing performance, achieving both properties simultaneously.
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 formulation enhances sealing and packaging properties by broadening the hot tack window, improving seal strength, and maintaining processability, allowing for lower sealing temperatures and higher packaging line speeds, thus increasing efficiency and reducing costs.
Implementation Method 1
The formulation enhances sealing and packaging properties by broadening the hot tack window, improving seal strength
Implementation Method 2
low crystalline polypropylene-based polymer for blown film applications
Data Source
AI summary
Disclosed are methods for making a multilayer blown film comprising a propylene-based elastomer in the skin and/or subskin layers.