Tubular Mesh Bag With Stable Bottom And Handle
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Solution Overview
Problem
Existing bag packaging solutions for fruit and vegetable products face issues with twisting and discomfort during handling due to uneven weight distribution, requiring oversized mesh thickness and complex manufacturing processes that limit production versatility.
Innovation Solution
A bag design featuring a tubular mesh casing with a continuous band linking the ends and a second band joined along its length to form a stable bottom, combined with a versatile bag production station using an expansion device with upper and lower welding groups, allowing for different bag types and maintaining production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the mesh thickness and size are increased to support the product weight, then the strength and reliability are improved, but the device complexity and material usage increase
Solution Approach 1:
The bag is divided into three functional zones: a thicker reinforcement zone at the bottom for weight support, a medium-thickness zone at the opening for sealing, and a thinner zone in the middle for flexibility and breathability. This segmentation allows each zone to have optimal thickness for its specific function rather than uniformly increasing the entire mesh thickness.
Solution Approach 2:
Different thicknesses are applied to different parts of the mesh bag based on local requirements: the bottom zone has greater thickness to bear product weight, the opening zone has adequate thickness for sealing integrity, while the middle zone maintains minimal necessary thickness for flexibility and breathability.
2Reliability
If the joint between the handle and tubular mesh is strengthened to withstand product weight, then the reliability is improved, but the manufacturing complexity increases
Solution Approach 1:
The handle is merged with the bottom band as a single continuous piece of sheet material, eliminating the need for separate handle components and complex attachment mechanisms. This unified structure simplifies manufacturing while maintaining structural integrity for withstanding product weight.
Solution Approach 2:
The bag combines mesh material with sheet material bands (first and second bands) to create a composite structure. The sheet material provides superior tensile strength for weight-bearing functions at critical locations, while the mesh provides breathability and flexibility, achieving reliable joints without excessive complexity.
3Stability of the object's composition
If a stable bottom is formed by joining the second band along its length, then the stability and ease of operation are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The second band is pre-formed and positioned to extend along the entire length of the tubular mesh before the final sealing operation. This preliminary positioning ensures proper alignment and stable bottom formation, reducing the precision requirements during the actual manufacturing process.
Solution Approach 2:
The second band, when joined along its length to the tubular mesh, automatically forms a stable bottom structure that self-supports the bag contents. The geometry and distribution of the band create inherent stability without requiring additional complex manufacturing precision or auxiliary support structures.
4Adaptability or versatility
If the production station is equipped with dual expansion devices for versatility, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The production station incorporates two expansion devices that can be selectively activated depending on the bag type being produced. This universal design allows the same station to handle different bag configurations (with or without stable bottoms, different handle arrangements) without requiring complete reconfiguration, achieving versatility while managing complexity through standardized modular components.
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 bag design provides stability and ergonomic handling, while the production station's dual expansion device enhances versatility and maintains production rates for various bag types, preventing twisting and ensuring efficient manufacturing.
Implementation Method 1
the joining of the expanded tubular mesh as it passes through the expansion device and a sheet material which is placed outside the tubular mesh
Data Source
AI summary
A bag (100) for packaging fruit and vegetable products (2) having a casing (103) for housing the products to be packaged and at least one first band (104) and one second band (105), each arranged on the outer face of the casing so as to seal the casing, the first band (104) being joined to the casing only at its ends (104a, 104b) forming a handle (106) and the second band (105) joined along the length thereof to the associated face of the casing, forming a stable bottom (105c).