Active Polystyrene Film Sustaining Antimicrobial Protection
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Solution Overview
Problem
Current food packaging technologies fail to effectively maintain the antimicrobial and antioxidant properties of active substances over time, leading to reduced shelf life of food products as these substances degrade or migrate from the packaging material.
Innovation Solution
A polystyrene film with a specific composition comprising 60-75% crystal polystyrene, 10-35% ethylene copolymer with polar monomers, an active substance, a migration agent, and an emulsifying agent, which allows the active substances to migrate to the surface and maintain their functionality, providing antioxidant or antimicrobial protection to food products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active substances are added directly to food products in high amounts, then antioxidant and antimicrobial protection is improved, but the amount of substance required increases and the initial amount gradually decreases during storage
Solution Approach 1:
The patent uses packaging materials (films, wraps, packages, slice separators) as intermediary carriers to deliver active substances to food products. The active substances are incorporated into the packaging material at controlled levels and released gradually during storage, eliminating the need to add high amounts directly to the food while maintaining continuous protection.
Solution Approach 2:
The active substances are pre-incorporated into the packaging material during manufacturing, so that the protection mechanism is already in place before the food is packaged. This preliminary incorporation allows for controlled release over time without requiring subsequent additions or high initial doses in the food itself.
2Duration of action of stationary object
If active substances are incorporated into packaging material, then the protection is maintained over time through controlled release, but the manufacturing process complexity increases
Solution Approach 1:
The patent incorporates active substances into packaging materials with specific compositional parameters (polymer matrix type, additive concentrations, formulation ratios) that control the release kinetics. By optimizing these parameters, the packaging provides sustained release over extended periods while maintaining manufacturability through established processing techniques.
Solution Approach 2:
The packaging materials are formulated as composite systems combining polymer matrices with active substances and auxiliary compounds. This composite approach allows the active substances to be embedded within the material structure, providing controlled release over time while maintaining the structural integrity and processability of the packaging.
3Reliability
If migration agents are used to promote active substance release, then the antioxidant and antimicrobial activity is improved, but the risk of substance migration into food increases
Solution Approach 1:
Migration agents in the patent serve as controlled intermediaries that facilitate the transfer of active substances from the packaging material to the food surface. These agents are selected and formulated to enable sufficient release of antioxidant and antimicrobial substances while maintaining migration levels within safe limits, thus balancing functionality with food safety.
Solution Approach 2:
The patent carefully controls the concentration and type of migration agents used, along with other formulation parameters, to optimize the release rate of active substances. By adjusting these parameters, the system achieves effective antioxidant and antimicrobial activity at the food surface while keeping migration levels below harmful thresholds.
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 effectively prolongs the shelf life of food products by maintaining the antimicrobial and antioxidant properties of the active substances, even at low concentrations, and ensures efficient release and activity, while also providing excellent processability and cutting properties for packaging applications.
Implementation Method 1
the inventors have developed a film in which the active substances migrate towards the surface of the film and maintain their functionality
Implementation Method 2
0%-15% (w/wt) of emulsifying agent (hereinafter referred to as EA) with an HLB greater than 8
Data Source
AI summary
The present invention belongs to the field of active polymer materials. Specifically, it relates to an active polystyrene film that has antimicrobial or antioxidant activity and the method of production of said film. It also refers to wrappers, packages and slice separators (interleavers) that comprise said film.