Peelable Laminated Woven Plastic Bag Seals for Leak-Free Opening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional woven plastic bags used for bulk materials face challenges such as slow sewing production lines, aesthetically unpleasing ends, difficulty in opening without tools, and susceptibility to leakage, breakage, and infestation, especially in high-speed filling operations.
Innovation Solution
The development of woven plastic bags with laminated layers and controlled peel strength seals, featuring easy open features like weakened areas and sealing tapes, and angled or curved cuts to reduce leakage and infestation, ensuring strong and durable bags that can be opened by hand without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional woven plastic bags are used for bulk materials, then they provide basic packaging functionality, but they cannot be printed with high end graphics and are too rudimentary for consumer type packaging
Solution Approach 1:
The patent combines woven polypropylene material with laminated film layers to create a composite bag structure. This allows the bag to maintain the strength and durability of woven material while adding the smooth surface and printability of laminated films, enabling high-end graphics for consumer packaging.
2Productivity
If conventional LWS bags are sewn shut on both ends, then they provide a strong structure, but the sewing production lines are slower than filling operations and create aesthetically unpleasing ends
Solution Approach 1:
The patent replaces the mechanical sewing process with heat sealing technology. The sealed ends are created through thermal bonding of the laminated layers, which can be performed at high speeds integrated with filling operations, eliminating the bottleneck of sewing while creating clean, aesthetically pleasing end surfaces.
3Reliability
If sewn bags are used, then they provide closure functionality, but they require puncturing the plastic bags resulting in reduced shelf-life and possible infestation
Solution Approach 1:
The patent replaces mechanical puncturing and sewing with heat sealing that fuses the laminated layers together. This creates a continuous, intact seal that maintains bag integrity, prevents infestation, and extends shelf-life while still providing secure closure functionality.
4Ease of operation
If pinch bottom laminated woven sacks are used, then they provide improved filling and closing operations, but they do not include an easy open feature requiring scissors or knives
Solution Approach 1:
The patent divides the sealed end structure into distinct functional zones: a sealed portion for maintaining integrity and a weakened portion with perforations for easy opening. This segmentation allows the bag to provide both secure sealing and consumer-friendly opening without requiring external tools.
5Reliability
If conventional bags are used, then they provide basic sealing, but they are susceptible to leakage, breakage, and infestation during handling
Solution Approach 1:
The patent uses laminated films bonded to woven polypropylene to create a composite structure that combines the strength and tear-resistance of woven material with the sealability and leak-proof properties of laminated films. This provides superior protection against leakage, breakage, and infestation during handling and storage.
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 bags provide a strong, durable, and aesthetically appealing solution that remains sealed, is easy to open, and withstands rigorous handling conditions while preventing leakage and infestation, maintaining integrity during filling, shipment, and storage.
Implementation Method 1
the sealed closure comprises a peel strength, wherein at least a portion of a surface of the front wall or the back wall is adapted to be separable from the sealed closure with a lower peel strength than the remaining portion of said sealed closure
Implementation Method 2
the difference in treatment comprises a difference in ionization of a portion of the one or more surfaces, wherein the portion of the one or more surfaces comprises a treatment of one or more of a polyurethane ink, a polyamide ink, a nitrocellulose ink
Data Source
Figure 1~2
Figure 3~6
Figure 7~8
AI summary
A woven laminated plastic bag having features that prevent leakage of contents out of the bag, or infestation of organisms into the contents of the bag is provided. 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 can also provide a top end and/or a bottom end either or both of which provide a discrete area which may contain discrete graphics and/or printing. The bag can also include a sealed closure that at least a portion of which can be easily peeled open with less force than the remainder of the sealed closure.