Four-Seal Bag Handle With Localized Strength
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Solution Overview
Problem
Existing product bags with handles fail to combine strength for carrying heavy loads with stackability and informative display features, as prior art handles often break under heavy loads and do not accommodate four-seal bags effectively, and existing solutions for strong handles are not compatible with bags requiring these additional features.
Innovation Solution
A method of producing a four-seal bag with a strong, convenient handle by integrating sheet materials through folding, assembling, and sealing, using a handle strip with higher tensile strength than the bag body material, and incorporating features like handle pulling holes and resealing mechanisms for industrial mass manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If handles are made of stronger materials than the bag body, then the handle strength is improved, but the connection between handle and bag body becomes weak and prone to breakage
Solution Approach 1:
The patent applies local quality by creating a handle with non-uniform cross-sectional area along its length. The handle has a larger cross-section at the connection points to the bag body and a smaller cross-section in the middle portion. This localized variation in material distribution ensures that the handle has sufficient strength at the critical connection zones while maintaining overall handle strength, preventing breakage at the connection between handle and bag body.
Solution Approach 2:
The patent employs composite materials by integrating the handle structure with the bag body through a sealing layer that is part of the sheet material itself. The handle and bag body are formed from the same sheet material with different local thicknesses, creating a composite structure where the sealing layer integrates both components. This ensures that the handle and bag body are made of compatible materials with matched mechanical properties, preventing connection failure.
2Adaptability or versatility
If handles are made of the same material as the bag body, then material compatibility is improved, but the handle strength is insufficient for carrying heavy loads
Solution Approach 1:
The patent applies local quality by varying the thickness of the sheet material at different locations. The handle portion is formed with a greater thickness (higher material quantity) compared to other parts of the bag body, while maintaining the same material composition. This localized increase in material density provides the handle with sufficient strength to carry heavy loads while preserving material compatibility throughout the entire bag structure.
3Ease of manufacture
If strip shaped handles are used, then ease of manufacture is improved, but the handles may cut the holder's fingers
Solution Approach 1:
The patent applies dimensionality change by transitioning from a one-dimensional strip-shaped handle to a two-dimensional loop-shaped handle formed from a folded sheet material. The handle is created by folding the sheet material back on itself, forming a continuous loop structure with substantial width and area. This dimensional transformation eliminates the cutting hazard while maintaining manufacturing simplicity, as the handle is formed integrally with the bag body through the same sealing process.
4Productivity
If four seal bag structure is used, then storage efficiency and display capability are improved, but compatibility with strong handle designs is reduced
Solution Approach 1:
The patent applies merging by integrating the handle structure directly into the four-seal bag body using the same sheet material and sealing process. The handle is formed as an integral part of the bag body through folding and sealing operations, creating a unified structure. This merging eliminates the incompatibility between four-seal bag structures and strong handle designs, allowing the bag to achieve both storage efficiency and handle strength simultaneously.
Data Source
AI summary
A bag with handle and method for producing the bag that incorporates the features of four seal bag body with a new handle part to obtain a new bag with a durable bag body that can carry a heavy load, can be stacked in high number without falling, consume less space in storage and transportation, has large front space and side spaces for product information display while on shelf, that is convenient to hold, strong and secure, that does not cut fingers in use, and that may be applied to shopping bags or reusable or resealable packaging bags. The concept of the method of producing said bag is steps of folding, assembling, and sealing a plurality of sheet materials which are not obvious to a person ordinarily skilled in the art.