Biodegradable Multilayer Film for Corrosive Packaging
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Solution Overview
Problem
Biodegradable polymeric films lack mechanical properties and are incompatible with packaging of tobacco-based products and pharmaceuticals, as well as acidic food products, due to poor melt strength and reactivity, making them unsuitable for high-speed packaging processes.
Innovation Solution
A biodegradable and compostable multilayer film is developed with a sealant product side layer containing a slip additive and specific blends of polylactic acid and copolyesters, along with intermediate and outer surface layers, which provide indestructible interlayer adhesion, high melt strength, and compatibility with corrosive ingredients, using processes like blown-film co-extrusion and cast film co-extrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If biodegradable polymeric films are used, then environmental degradability is improved, but mechanical properties and melt strength deteriorate
Solution Approach 1:
The patent employs a multilayer composite structure combining different biodegradable polymers (PLA, PBAT, PCL) in specific ratios to achieve both environmental degradability and enhanced mechanical properties. The composite formulation PLA-1 (PLA 60-70%, PBAT 20-30%, PCL 5-15%) creates synergistic effects where each polymer contributes its strengths, resulting in films with improved tensile strength, elongation, and melt strength while maintaining biodegradability.
Solution Approach 2:
The patent optimizes processing parameters including extrusion temperature (180-220°C), molecular weight of polymers (PLA 100-200 kDa, PBAT 50-100 kDa, PCL 75-150 kDa), and blend ratios to achieve the desired balance between mechanical properties and biodegradability. The molecular weight and composition parameters are specifically tuned to enhance melt strength while preserving environmental degradability.
2Object-affected harmful factors
If biodegradable polymeric films are used, then compostability is improved, but compatibility with corrosive ingredients deteriorates
Solution Approach 1:
The multilayer composite structure provides barrier protection against corrosive ingredients (tobacco moisture, pharmaceutical chemicals, food acids) while maintaining compostability. The specific polymer combination and layer configuration create a protective barrier that prevents chemical interaction between the packaged product and the film, ensuring reliability in packaging applications.
Solution Approach 2:
Different layers of the multilayer film are designed with specific functions: the inner layer provides barrier properties against corrosive ingredients, the middle layer provides mechanical strength, and the outer layer provides surface properties. This local differentiation of properties allows the film to simultaneously achieve compostability and compatibility with corrosive ingredients.
3Ease of manufacture
If biodegradable polymeric films are used, then surface properties deteriorate, but ease of processing improves
Solution Approach 1:
The patent optimizes surface properties by controlling the composition and thickness of the outer layer, adjusting slip additive content (0.01-10 wt%), and modifying surface treatment parameters (corona treatment 2-10 mJ/cm², plasma treatment 50-200 W). These parameter adjustments ensure proper surface tension, slip, and printability while maintaining ease of processing during high-speed packaging operations.
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 exhibits excellent mechanical properties, dimensional stability, and compatibility for packaging tobacco-based and pharmaceutical products, with improved surface properties and resistance to corrosive ingredients, enabling effective use in high-speed packaging processes while being compostable and non-reactive.
Implementation Method 1
due to poor melt strength and reactivity, making them unsuitable for high-speed packaging processes
Implementation Method 2
a sealant product side layer comprising at least one slip additive and having a pre-determined co-efficient of friction
Implementation Method 3
Inter layer adhesion and or bond strength: The adhesion or bond strength is designed in a manner that the bond is indestructible and layers are inseparable under functional conditions
Implementation Method 4
Biodegradability: Biodegradability refers to the ability of materials to completely break down and decompose into natural elements by biological means
Implementation Method 5
Compostability: Compostability refers to the ability of materials to break down to nutrient rich mass (humus) in a short span of time when provided with composting conditions
Data Source
AI summary
The present disclosure provides a biodegradable and compostable multilayer film. The biodegradable and compostable multilayer film comprises a sealant product side layer comprising at least one slip additive and having a pre-determined co-efficient of friction, an outer surface layer, and at least one intermediate layer disposed between the sealant product 5 side layer and the outer surface layer. The biodegradable and compostable multilayer film of the present disclosure has good mechanical properties and is non-reactive with tobacco based products, medicines, and food products to be packaged.