Polymeric Bag Reinforcing Seals for Gusset Tear Resistance
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Solution Overview
Problem
Conventional plastic bags with gussets are prone to breaking due to inadequate sealing, which compromises their durability and ability to contain goods effectively.
Innovation Solution
The implementation of reinforcing seals along the side edges and gussets of plastic bags to enhance the structural integrity and prevent breakage, using a dual-seal system that extends from the bottom edge to the top edge and across the side edges, optionally incorporating textured or cross-hatched patterns to ensure strong bonding and visual reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing is used along the side edges and gussets of plastic bags, then the manufacturing process is simple, but the bags are prone to breaking and have poor durability
Solution Approach 1:
The sealing structure is divided into multiple segments: a first seal extends from the bottom edge toward the top edge along the side edge, and a second seal extends from the side edge toward the opposite side edge across the gusset. This segmentation allows each seal to handle specific stress directions, preventing bag breaking while maintaining manufacturing simplicity.
Solution Approach 2:
The reinforcing seals are pre-positioned at critical locations (side edges and gussets) before the bag is put into service. This preliminary reinforcement ensures that high-stress areas are strengthened in advance, preventing breakage during normal use without requiring complex additional structures.
2Strength
If the seal extends along the entire side edge from bottom to top, then the strength is improved, but the manufacturing time and complexity increase
Solution Approach 1:
Instead of uniformly sealing the entire side edge, the patent applies seals locally at critical points: the first seal runs along the side edge from the bottom, and the second seal crosses the gusset horizontally. This localized sealing approach provides maximum strength where stress concentration occurs while minimizing sealing time and complexity.
Solution Approach 2:
The patent uses partial sealing action by extending seals only to the necessary points rather than sealing the entire perimeter. The first seal extends from the bottom toward the top along the side edge, and the second seal extends from the side edge toward the opposite side edge across the gusset, providing sufficient reinforcement without excessive sealing time.
Data Source
AI summary
A polymeric bag comprises front and rear walls, a bottom and top edge spaced apart along a bag length, and first and second side edges spaced apart along a bag width. The front and rear walls, bottom and top edges, and first and second side edges collectively define an interior compartment therebetween. A reclosable opening is disposed along the top edge to provide access to the interior compartment. The polymeric bag may have a side gusset(s) and/or a bottom gusset disposed at the side and bottom edges respectively. One or more reinforcing seals are disposed along the first and second side edges to seal a portion of at least one of the side gusset and bottom gusset. Each reinforcing seal has a length extending from the bottom edge toward the reclosable opening and a width extending from one side edge toward another.