Flexible Polymeric Packaging for Produce Moisture Control
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Solution Overview
Problem
Current packaging containers for fruits and vegetables lack controlled ventilation and moisture regulation, leading to dehydration and weight loss, and are costly due to rigid construction and adhesive labels.
Innovation Solution
A flexible packaging container made from porous polymeric and micro-perforated materials with a flat base, using a unique heat-sealing process of multiple polymeric sheets to control ventilation and moisture, reducing material usage and costs, and incorporating absorbent materials to minimize dehydration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid plastic packaging is used to ensure structural strength, then the container maintains its shape and rigidity, but the packaging cost increases and moisture control is poor
Solution Approach 1:
The patent uses flexible plastic material (polyethylene or polypropylene) with thickness of 0.03mm to 0.05mm instead of rigid plastic, creating a flexible bag that can be heat-sealed and folded to maintain shape without requiring thick rigid walls
Solution Approach 2:
The patent combines flexible plastic material with porous material (paper, fabric, or open-cell foam) to create a composite structure that provides both flexibility and structural support, eliminating the need for expensive rigid plastic while maintaining shape
2Ease of manufacture
If flexible plastic bags are used to reduce cost, then packaging expense decreases, but the containers cannot be displayed upright and moisture control is poor
Solution Approach 1:
The patent divides the packaging into two functional layers: a flexible plastic layer for moisture barrier and a porous material layer for structure and ventilation, with the porous material forming a rigid base that enables upright display
Solution Approach 2:
The combination of flexible plastic and porous material creates a composite structure where the porous material provides a rigid base for upright display while the flexible plastic provides moisture control
3Ease of manufacture
If conventional packaging is used without controlled ventilation, then manufacturing is simple, but dehydration and weight loss occur
Solution Approach 1:
The patent incorporates porous material (paper, fabric, or open-cell foam) as one of the layers that allows controlled ventilation through its porous structure, enabling gas exchange while maintaining moisture balance, and this material can be easily integrated into the manufacturing process
4Loss of information
If adhesive labels are applied to rigid containers for product information, then product identification is achieved, but the packaging cost increases
Solution Approach 1:
The flexible outer surface of the packaging serves multiple functions: it provides structural flexibility, allows heat-sealing, and acts as a substrate for direct printing of product information, eliminating the need for separate adhesive labels
Solution Approach 2:
The patent uses direct printing on the flexible packaging surface instead of adhesive labels, creating a more integrated and cost-effective information display system
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 solution effectively reduces dehydration and weight loss by 10-20% in packaged fruits and vegetables, extends their freshness without refrigeration, and lowers packaging costs through material efficiency and recyclability.
Implementation Method 1
using porous polymeric and micro-perforated materials that enable controlled ventilation of the gases emitted by the fruits and vegetables
Implementation Method 2
using porous polymeric and micro-perforated materials that enable controlled ventilation of the gases emitted by the fruits and vegetables
Implementation Method 3
incorporating absorbent materials to minimize dehydration
Implementation Method 4
using a unique heat-sealing process of multiple polymeric sheets to control ventilation and moisture
Data Source
AI summary
A lightweight packaging container for the preservation of fruits and vegetables is made from flexible polymeric materials that permit controlled ventilation, enabling the packaged produce to remain hydrated for a longer time, keeping them fresh without the need for refrigeration. The body of the packaging is made of layered polymeric materials. An embodiment includes an outer layer of polymeric material having a structural function, a second layer of porous polymeric material having a moisture-absorbing function, and a third layer of polymeric material containing micro-perforations that have a moisture-retaining function. The materials are pre-arranged in the center of the wider outer strip. The multilayer material is folded and the edges are heat-sealed to form a packaging bag with a flat base. A unique heat-sealing method allows only the edges of the polymeric layers to be joined, leaving the center portion thereof layered but not laminated.