Polymeric Bag Easy Access Feature Without Adhesives
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Solution Overview
Problem
Conventional woven plastic bags, particularly those used for bulk materials, face challenges such as difficulty in opening without tools, reduced shelf-life due to punctured seals, and aesthetically unpleasing displays, which hinder consumer identification and lead to potential infestation.
Innovation Solution
The development of woven and non-woven polymeric bags featuring an easy open and re-sealable design without adhesives, utilizing a combination of flanges and grooves or zipper-like structures made from polypropylene or polyethylene, sealed using heat, pressure, or ultrasound to create a plastic-to-plastic seal, ensuring easy access and re-sealability while maintaining strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional sewn LWS bags are used, then the bag structure is strong and durable, but the closing operation at high speed filling lines is slow and the ends are aesthetically unpleasing
Solution Approach 1:
The patent replaces the mechanical sewing system with a heat sealing system. The heat sealable layer allows the bag ends to be sealed through thermal application rather than mechanical needle penetration, enabling faster closing operations while maintaining structural integrity and providing a clean aesthetic appearance.
2Reliability
If sewn ends are used on LWS bags, then the bags can be closed securely, but the seals are punctured requiring puncturing instruments and resulting in reduced shelf-life and possible infestation
Solution Approach 1:
The patent replaces mechanical sewing with heat sealing using a heat sealable layer. This thermal sealing method creates a continuous sealed surface without needle punctures, eliminating pathways for infestation and preserving shelf-life while maintaining secure closure.
3Strength
If conventional woven plastic bags are used, then the bags are strong and durable, but they require scissors or knives to open and require excessive force
Solution Approach 1:
The patent divides the bag structure into a non-tearable woven body and a separate heat sealable layer at the ends. This segmentation allows the main bag to maintain its strength and durability while the sealed ends provide a controlled opening mechanism that requires minimal force, as the heat sealable layer can be separated without compromising the overall bag integrity.
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 allows for easy opening and re-sealing of bags without tools, enhancing consumer convenience, maintaining product integrity, and providing an attractive graphic display, thus addressing the limitations of conventional bags in terms of ease of use, durability, and shelf-life.
Implementation Method 1
sealed using heat, pressure, or ultrasound to create a plastic-to-plastic seal
Implementation Method 2
sealed using heat, pressure, or ultrasound to create a plastic-to-plastic seal
Data Source
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AI summary
A woven laminated plastic bag having an easy access or re-sealable feature and methods for making the same are provided. In certain aspects the easy access or re-sealable feature is attached to the bag without the use of an adhesive. In various aspects the bag can be fabricated from woven polypropylene and/or polyethylene layer which can be laminated with a film layer, can form a pinch bottom bag, and can have one or both sides include graphics and/or printing. The bag in one embodiment can also provide a top end and/or a bottom end either or both of which provide one or more discrete areas which may each contain discrete graphics and/or printing.