Plastic Thread Bonding for FIBC Folding Edge
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Solution Overview
Problem
Traditional sewing methods for the folding edge of Flexible Intermediate Bulk Containers (FIBC) lead to powder leakage, structural instability, and recycling difficulties due to material differences and piercing damage, and do not adequately address the need for a strong, leak-proof bond.
Innovation Solution
A plastic thread bonding method using a plastic injection needle to form eyelets, thread posts, and bridges along the folding edge, where melted plastic is injected and cooled to create a strong, cohesive bond that eliminates gaps and compensates for material differences, forming a high-strength, low-elongation structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cotton thread and eyelet sewing method is used, then the folding edge can be connected, but powder leakage occurs due to gaps between eyelet and thread
Solution Approach 1:
The patent uses plastic thread made of the same material as the FIBC body instead of cotton thread, creating homogeneity between the bonding material and the container material. This eliminates material incompatibility and ensures the bonding structure integrates seamlessly with the FIBC, preventing powder leakage while maintaining structural integrity.
Solution Approach 2:
The patent changes the bonding method from mechanical sewing with eyelets to thermal bonding using melted plastic. By changing the bonding mechanism from mechanical interlocking to thermal fusion, the process eliminates gaps and creates a seamless bond that prevents powder leakage effectively.
2Strength
If thicker thread is used to compensate eyelet piercing damage, then structural strength may improve, but the eyelet diameter increases causing greater piercing damage
Solution Approach 1:
The patent extracts and eliminates the eyelet component from the bonding system. By removing the eyelet entirely and replacing it with direct plastic thread fusion, the harmful piercing damage is eliminated while maintaining bonding strength through thermal fusion of the plastic material.
Solution Approach 2:
The patent replaces the mechanical sewing system (needle, eyelet, cotton thread) with a thermal bonding system (melted plastic injection). This substitution eliminates the need for eyelets and mechanical interlocking, reducing piercing damage while achieving strong bonds through material fusion.
3Ease of manufacture
If cotton thread and eyelet are arranged in a straight line for sewing, then the sewing process is simple, but a continuous unstable structure is formed that may breakage under heavy loads
Solution Approach 1:
The patent introduces a curved or zigzag bonding path for the plastic thread instead of a straight line arrangement. This curved configuration distributes stress more evenly along the bonding line, preventing stress concentration and potential breakage under heavy loads, while maintaining manufacturing simplicity through automated injection molding.
4Ease of manufacture
If cotton thread is used for sewing, then the folding edge can be bonded, but recycling becomes difficult due to material differences between thread and FIBC
Solution Approach 1:
The patent uses plastic thread made of the same polypropylene material as the FIBC body, creating complete material homogeneity. This allows the entire structure to be recycled together as a single material type, eliminating the need to separate different materials and significantly improving recyclability while maintaining effective bonding.
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 method provides a robust, leak-proof bond that enhances the structural integrity of the FIBC, reduces the risk of deformation or breakage under heavy loads, and facilitates easier recycling by using the same material for bonding and the container.
Implementation Method 1
the plastic injection needle injects a melted plastic from a needle tip of the plastic injection needle
Implementation Method 2
the melted plastic is cooled instantly when touching the solid surface
Implementation Method 3
solidified and crystallized at the position of the eyelet corresponsive to the bottom surface of the folding edge to form a base point
Implementation Method 4
instantly cool and condense the melted plastic filled in the eyelet to form a thread post by the cooling effect of the pressurized cold air
Implementation Method 5
instantly cool and condense the melted plastic filled in the eyelet to form a thread post
Implementation Method 6
the melted plastic is condensed instantly to form a thread bridge
Data Source
AI summary
A plastic thread bonding method and structure for folding edge of a FIBC includes setting the folding edge of the FIBC flatly on a metal solid surface; using a cooling device to maintain a condensation temperature of the solid surface; performing a needle insertion action of the folding edge by a plastic injection needle, and condensing and crystallizing at the eyelet to form a base point; performing a needle withdrawal action by the plastic injection needle to fill up a melted plastic into the eyelet, applying a pressurized cold air to condense the melted plastic to from a thread post; performing a horizontal translation action of the plastic injection needle or the folding edge, and applying the pressurized cold air to condense the melted plastic to form a thread bridge; and repeating the aforementioned procedure to form a next base point, a next thread post and a thread bridge.