Trash Bag Bottom Sealing with Segmented Heat Zones
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Solution Overview
Problem
Traditional trash bags face issues with inconsistent heat-sealing parameters due to varying layers of material, leading to potential seam weakness or burning, and compromised hermetic tightness, especially at the border between four-layer and two-layer regions.
Innovation Solution
A manufacturing apparatus that folds a tubular element of synthetic material twice along centerlines to create eight superimposed layers, allowing for consistent heat-sealing and pre-cutting to form a bag with enhanced mechanical strength and hermetic tightness, utilizing a folding apparatus with adjustable folding units and heat-sealing parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat-sealing parameters suitable for four layers are adopted, then the heat-sealed seam in the four-layer region is strong, but the heat-sealed seam in the two-layer region is burnt
Solution Approach 1:
The heat-sealing process is segmented into two distinct zones: a first heat-sealing zone for sealing the four-layer accordion-like portions and a second heat-sealing zone for sealing the two-layer central region. This segmentation allows each zone to have optimized heat-sealing parameters (temperature, pressure, time) suitable for its specific layer configuration, preventing burning in the two-layer region while maintaining strength in the four-layer region.
Solution Approach 2:
Different heat-sealing parameters are applied to different regions of the bag bottom. The first heat-sealing bar operates at parameters optimized for four layers of material, while the second heat-sealing bar operates at parameters optimized for two layers of material. This local quality approach ensures that each region receives the appropriate sealing conditions for its specific structural requirements.
2Object-affected harmful factors
If heat-sealing parameters suitable for two layers are adopted, then the heat-sealed seam in the two-layer region is not burnt, but the heat-sealed seam in the four-layer region is too weak
Solution Approach 1:
The heat-sealing process is segmented into two distinct zones: a first heat-sealing zone for sealing the four-layer accordion-like portions and a second heat-sealing zone for sealing the two-layer central region. This segmentation allows each zone to have optimized heat-sealing parameters (temperature, pressure, time) suitable for its specific layer configuration, preventing burning in the two-layer region while maintaining strength in the four-layer region.
Solution Approach 2:
Different heat-sealing parameters are applied to different regions of the bag bottom. The first heat-sealing bar operates at parameters optimized for four layers of material, while the second heat-sealing bar operates at parameters optimized for two layers of material. This local quality approach ensures that each region receives the appropriate sealing conditions for its specific structural requirements.
3Productivity
If accordion-like portions are used to reduce width during heat-sealing, then productivity increases, but the border between four-layer and two-layer regions forms a step that compromises hermetic tightness
Solution Approach 1:
The tubular element is pre-folded into an accordion-like configuration before heat-sealing, creating the multi-layer structure in advance. This preliminary action allows the subsequent heat-sealing process to work with predetermined layer arrangements, enabling the use of multiple heat-sealing bars operating in parallel to maintain high productivity while ensuring proper sealing at each transition zone.
Solution Approach 2:
The heat-sealing process is segmented into two distinct zones: a first heat-sealing zone for sealing the four-layer accordion-like portions and a second heat-sealing zone for sealing the two-layer central region. This segmentation allows each zone to have optimized heat-sealing parameters (temperature, pressure, time) suitable for its specific layer configuration, preventing burning in the two-layer region while maintaining strength in the four-layer region.
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 solution increases mechanical strength and hermetic tightness of the bag's bottom, improving its capacity by approximately 9% and ensuring consistent heat-sealing across the seam, addressing the limitations of traditional bags.
Implementation Method 1
a first folding unit adapted to fold a tubular element along said first center-line, and a second folding unit arranged downstream of said first folding unit and adapted to fold said tubular element along said second center-line
Implementation Method 2
The bottom of the bag is closed by a transverse heat-sealing line
Data Source
Figure 1~3
Figure 4~5
Figure 6
AI summary
A segment of a tubular element (10) made of a sheet of synthetic material is folded longitudinally twice respectively along a first centerline (L1) and a successive second centerline (L2) so as to have, in a flattened configuration, eight superimposed layers along its entire width. The eight layers are mutually heat-sealed along a transverse heat-sealing line (16) that is proximate to an end of the segment of tubular element (10) and forms the bottom of the bag.