Woven Laminated Plastic Bag Easy-Open Structure Without Tearing
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Solution Overview
Problem
Conventional woven plastic bags used for bulk materials are difficult to open without scissors or knives, require excessive force, and lack an aesthetically pleasing display, leading to reduced shelf-life and potential infestation.
Innovation Solution
Incorporating an easy open feature with weakened areas, such as cuts and perforations, in woven and non-woven plastic bags, allowing for easy opening with minimal force and maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bag structure is made strong and durable, then the bag can maintain structural integrity and resist tearing, but the bag becomes difficult to open without scissors or knives and requires excessive force
Solution Approach 1:
The bag structure is segmented into different regions with different strength characteristics. The main body of the bag maintains full strength for durability, while specific opening areas incorporate weakened sections that allow easy manual opening. This segmentation enables the bag to simultaneously achieve structural integrity and ease of opening by applying different mechanical properties to different zones.
Solution Approach 2:
The bag exhibits local quality variations where the opening area has reduced strength compared to the main body. By locally weakening specific regions at the opening while maintaining full strength elsewhere, the bag provides easy opening capability without compromising overall structural integrity and durability.
2Reliability
If the bag is sealed tightly to prevent infestation and maintain shelf-life, then product protection is improved, but the bag becomes difficult to open and requires excessive force
Solution Approach 1:
The sealing system is segmented into the main sealed body that maintains tight closure for product protection and a separate opening mechanism with weakened sections that enable easy manual opening. This segmentation allows the bag to maintain reliable sealing for shelf-life protection while providing a dedicated easy-open path that does not compromise the integrity of the sealed portions.
Solution Approach 2:
Weakened sections are pre-formed at the opening areas during bag manufacturing, creating predetermined easy-open paths before the bag is sealed and used. This preliminary action allows users to open the bag easily without requiring excessive force, while the main sealing structure remains intact to maintain product protection and shelf-life.
3Ease of manufacture
If conventional woven plastic bags are used for bulk materials, then the bags provide basic functionality, but they lack aesthetically pleasing graphic display and appeal to consumers
Solution Approach 1:
The bag employs a composite structure combining woven plastic material for the main body with integrated graphic elements and design features. This composite approach allows the bag to maintain basic functionality for bulk material storage while incorporating aesthetically pleasing graphics and consumer-friendly features such as easy-open mechanisms, thereby enhancing adaptability for retail and consumer applications.
Data Source
AI summary
A woven laminated plastic bag having an easy open feature is provided. The easy open feature is generally defined by a weakened portion in the bag. A cover may cover the weakened portion and may be opened by pulling on a pull tab. In various aspects the bag can be fabricated from a woven polypropylene or polyethylene layer which can be coated or laminated with a polypropylene or polyethylene film layer, can form a pinch bottom bag, a block bottom bag, and can have front, back, side, and top and bottom panels that may have high quality graphics and/or printing.