Disposable Gloves m-LLDPE EVA Blend Tear Strength
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Solution Overview
Problem
Conventional disposable polyethylene gloves fail to meet requirements for durability, comfort, dexterity, and environmental impact due to their material properties, such as ease of tearing and poor chemical resistance.
Innovation Solution
A thermoplastic material comprising a blend of metallocene-linear low density polyethylene (m-LLDPE) and ethylene-vinyl acetate copolymer (EVA), which provides improved toughness, tear strength, and heat seal strength, allowing for the production of gloves with enhanced dexterity and reduced environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polyethylene materials are used for disposable gloves, then manufacturing cost is reduced and chemical resistance is improved, but durability and tear strength deteriorate
Solution Approach 1:
The patent employs composite materials by blending metallocene-linear low density polyethylene (m-LLDPE) with conventional linear low density polyethylene (LLDPE) or high density polyethylene (HDPE). This composite approach combines the superior toughness and elongation properties of m-LLDPE with the cost-effectiveness and processability of conventional polyethylenes, achieving enhanced tear strength while maintaining manufacturing efficiency
Solution Approach 2:
The patent applies parameter changes by controlling the molecular weight distribution, density, and composition ratios of the polyethylene blend. By optimizing these parameters—specifically using m-LLDPE with controlled short chain branching and combining it with LLDPE or HDPE in specific proportions—the material achieves optimal balance between tear strength, elongation, and manufacturing cost
2Ease of operation
If conventional polyethylene materials are used for disposable gloves, then manufacturing simplicity is maintained, but comfort and dexterity deteriorate
Solution Approach 1:
The patent utilizes parameter changes by adjusting the density and molecular structure of the polyethylene blend. The m-LLDPE component provides enhanced flexibility and elongation (50-150% elongation at break), while the blend composition is optimized to maintain appropriate stiffness for dexterity. This allows the glove material to be both comfortable and easy to operate with, despite the slightly more complex material composition
3Productivity
If conventional polyethylene materials are used for disposable gloves, then ease of manufacturing is maintained, but environmental impact worsens
Solution Approach 1:
The patent addresses environmental impact through parameter changes in material composition by incorporating recyclable polyethylene blends with controlled degradation properties. The m-LLDPE/LLDPE or m-LLDPE/HDPE combinations are designed to maintain manufacturing efficiency while improving biodegradability and recyclability compared to conventional single-component polyethylenes, thereby reducing environmental persistence
Data Source
AI summary
A glove and glove construction material comprising two or more ethylene-based polymers which comprise (i) a first metallocene-linear low density polyethylene (m-LLDPE) and (ii) at least one ethylene-based polymer selected from the group consisting of a second metallocene-linear low density polyethylene (m-LLDPE), an ethylene-vinyl acetate copolymer (EVA), a linear low density polyethylene (LLDPE), and combinations thereof, plus optional additives.