Offset Aperture Food Bag Retains Warmth
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Solution Overview
Problem
Disposable bags for fast food items fail to retain warmth and crispiness effectively, as they lack heat insulation and are not suitable for reheating, leading to food items becoming soggy and unsuitable for biodegradable and cost-effective solutions.
Innovation Solution
A cellulose-based, biodegradable bag with oven-durable outer and inner plies, pierced with offset apertures to create pockets that prevent backflow of vapors and allow fresh air in, maintaining food warmth and crispiness by using adhesive layers for construction and allowing reheating in ovens or microwaves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If disposable bags are made without heat insulation to reduce cost and improve biodegradability, then manufacturing cost decreases and environmental friendliness improves, but the food items quickly cool down and lose their warmth
Solution Approach 1:
The bag uses a composite structure with an outer cellulose-containing layer and an inner vapor barrier layer, combining the biodegradability and heat retention properties of cellulose with the moisture barrier properties of the vapor barrier layer, achieving both environmental friendliness and thermal insulation
Solution Approach 2:
The bag applies different material properties to different layers: the outer layer provides heat retention and biodegradability, while the inner layer provides vapor barrier properties, creating localized functional zones that collectively solve the contradiction between cost and warmth retention
2Ease of operation
If perforations are added to release moisture and maintain crispiness, then food crispiness is preserved, but excessive moisture release causes baked goods to become stale
Solution Approach 1:
The bag incorporates a porous cellulose-containing outer layer that allows controlled moisture vapor transmission, enabling the bag to release excess moisture while preventing complete drying, thus maintaining food crispiness without causing staleness
Solution Approach 2:
The bag controls the rate of moisture transmission by adjusting the porosity and thickness of the cellulose layer, changing the physical parameters of moisture diffusion to achieve optimal balance between crispiness maintenance and prevention of excessive drying
3Productivity
If prepackaging is implemented to improve delivery speed and employee efficiency, then productivity increases, but the bags must be suitable for reheating in ovens and microwaves which limits material choices
Solution Approach 1:
The bag uses a composite structure where the outer cellulose-containing layer is oven-safe and the inner vapor barrier layer is microwave-compatible, enabling the single bag to withstand both conventional oven heating and microwave reheating, thus achieving versatility across different heating methods
Solution Approach 2:
The bag is designed to perform multiple functions: it provides thermal insulation during cooling, prevents moisture loss during storage, and withstands high temperatures during both conventional oven baking and microwave reheating, making it universally applicable across different food service scenarios
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 bag effectively retains the warmth and crispiness of food items for a useful period, reducing delivery wait times and providing a biodegradable, cost-effective solution for packaging and reheating fast food items.
Implementation Method 1
Vapors emitted by the warmed food item are driven into the pocket via the apertures formed in the inner ply by means of the temperature differential between the interior and the pocket
Implementation Method 2
cellulose-based, oven-durable outer and inner plies
Implementation Method 3
outer and inner plies which are at least partially adhesively affixed together by means of two or more of an upper transversal adhesive layer, a lower transversal adhesive layer, and at least one longitudinal adhesive layer
Data Source
AI summary
A bag for retaining the warmth and crispiness of food items contained therein is disclosed. The bag is made of cellulose-based, oven-durable outer and inner plies that are adhesively affixed together by adhesive layers, a bag interior defined by adjacent faces of the inner ply, and at least one pocket formed between the outer and inner plies defined by adjacent adhesive layers. The outer and inner plies are pierced with a plurality of apertures such that the apertures pierced within the outer ply are offset from the apertures pierced within the inner ply by a predetermined dimension. Due to a temperature differential, vapors emitted by a warmed food item inserted in the bag interior are driven into each one pocket and remain within the corresponding pocket for a useful period of time. A process for producing the bag is also disclosed.