Modified Atmosphere Packaging for Cooked Vegetables
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Solution Overview
Problem
The short shelf life of cooked vegetable food products in existing packaging solutions fails to meet consumer demands for longer storage periods, especially with changing consumer habits and reduced availability of time for frequent shopping.
Innovation Solution
A method involving preparation, sanitizing washing, drying, cooking, rapid cooling, and packaging in partially barriered packages with a modified atmosphere of low oxygen and high carbon dioxide content, specifically using a PP-EVOH-PP multilayer material and a protective polypropylene film, to extend the shelf life of cooked vegetables up to 30 days.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional transparent containers are used for packaging cooked vegetables, then the packaging is simple and allows visual inspection, but the shelf life is limited to 2-3 days due to rapid perishability
Solution Approach 1:
The patent employs a multilayer packaging structure combining different materials (cellulose film, aluminum foil, and plastic film) to achieve extended shelf life. The composite structure provides synergistic effects: cellulose offers breathability and biodegradability, aluminum foil provides barrier properties against light and moisture, and plastic film ensures sealing and structural integrity. This composite approach resolves the contradiction by enabling long-term preservation without overly complicating the packaging system.
Solution Approach 2:
The patent introduces a modified atmosphere inside the packaging containing carbon dioxide (30-70%), oxygen (5-20%), and nitrogen (5-20%). This inert gas environment suppresses microbial growth and oxidation reactions, thereby extending the shelf life of cooked vegetables from 2-3 days to potentially weeks or months. The atmosphere control works in conjunction with the multilayer structure to maintain product quality over extended periods.
2Duration of action of stationary object
If modified atmosphere packaging is applied to extend shelf life, then the storage duration increases, but the packaging structure and gas composition become more complex
Solution Approach 1:
The patent modifies the atmospheric parameters within the packaging by controlling the composition of carbon dioxide (30-70%), oxygen (5-20%), and nitrogen (5-20%). This parameter change creates an environment unfavorable for microbial growth and chemical degradation, thereby extending storage duration. The multilayer structure facilitates these parameter changes by providing selective permeability and barrier properties that maintain the modified atmosphere over time.
3Ease of operation
If frequent shopping trips are made to ensure fresh vegetable consumption, then the vegetables remain fresh, but consumer time and convenience are reduced
Solution Approach 1:
The modified atmosphere with controlled levels of carbon dioxide (30-70%), oxygen (5-20%), and nitrogen (5-20%) creates a preservation environment that maintains vegetable freshness over extended periods. This inert environment slows down respiratory processes and microbial activity, allowing consumers to store cooked vegetables for weeks or months without frequent repurchasing, thereby improving convenience while maintaining product quality.
Solution Approach 2:
The multilayer packaging structure with cellulose, aluminum foil, and plastic film provides complementary functions that collectively maintain product freshness. The cellulose layer allows controlled breathability, the aluminum foil blocks light and moisture, and the plastic film ensures sealing. This composite system reliably preserves vegetables over long storage periods, enabling consumers to buy in bulk and reduce shopping frequency.
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 method effectively extends the shelf life of cooked vegetables to 30 days by maintaining freshness and organoleptic properties while allowing a controlled gas exchange, meeting consumer needs for longer storage.
Implementation Method 1
packaging of said vegetables in partially barriered packages in an atmosphere with low oxygen content and in the presence of carbon dioxide
Data Source
AI summary
The object of the present invention is a method of packaging and storing cooked vegetable food products, in particular leafy, flower or root vegetables. In particular, the present invention relates to a method for packaging cooked vegetable food products, in particular vegetables, which comprises the following steps: a) preparation of said vegetables; b) washing of said vegetables in the presence of a sanitizing agent active against yeasts and molds; c) drying of said washed vegetables; d) cooking of said vegetables after drying; e) rapid cooling of said cooked vegetables to a chilled temperature; f) packaging of said vegetables in partially barriered packages in an atmosphere with low oxygen content and in the presence of carbon dioxide.