Woven Plastic Bag Perforation Structure for Easy Opening
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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
The development of woven and non-woven plastic bags with an easy open feature, featuring weakened areas such as cuts and perforations, allowing for easy opening with a pull tab, and maintaining structural integrity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional woven plastic bags are used, then the bag provides strength and durability, but the bag is difficult to open without scissors or knives and requires excessive force
Solution Approach 1:
The bag is divided into a strong body portion and a weakened opening portion. The opening portion contains cuts and/or perforations that segment the continuous material, creating a predetermined tear path that requires less force to open while the rest of the bag maintains its full strength for containing bulk materials.
Solution Approach 2:
Different portions of the bag have different mechanical properties. The opening portion is locally weakened through cuts and/or perforations to facilitate easy opening, while the body portions remain intact and strong for durability and containing the bulk material.
2Productivity
If sewn LWS bags are used, then the bag provides a strong structure, but the sewing production lines are slower than filling operations and the sewn ends do not provide an aesthetically pleasing display
Solution Approach 1:
The sewing operation is completely removed from the closing process. Instead of using complex sewing machinery, the invention uses pre-formed folded ends with adhesive applications, extracting the sewing step entirely and replacing it with simpler folding and adhesive bonding operations that match filling line speeds.
3Reliability
If sewn LWS bags are used, then the bag provides a strong structure, but the sewn ends require puncturing the plastic bags and thus result in a bag that is not sealed, leading to reduced shelf-life and possible infestation
Solution Approach 1:
The ends are pre-folded and pre-sealed with adhesive before the bag is filled. This preliminary sealing action creates a puncture-resistant closed end that maintains the bag's integrity and prevents infestation, while the opening portion is pre-weakened with cuts and/or perforations to facilitate easy consumer opening.
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. In various aspects the bag can be fabricated from a woven polyethylene layer which can be laminated with a polyethylene 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.