Polyester Adhesive Powder Bonding in Fiber-Reinforced Geogrid Strips
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Solution Overview
Problem
Conventional geogrids face issues with poor adhesiveness between reinforcing materials and coating materials, leading to reduced tensile strength, creep strain, and poor construction resistance, friction properties, and shape stability.
Innovation Solution
A durability-enhanced fiber reinforced polymer strip is manufactured using a polyester-based adhesive powder on the reinforcing fiber surface, combined with a thermoplastic polymer resin, and a lattice-shaped geogrid is formed with alternating intersecting strips to enhance adhesiveness and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a thermoplastic polymer resin is extruded and inserted to form and adhere the weft-directional strip, then the geogrid structure is formed, but the reinforcing fiber in the polymer is damaged and the physical properties are deteriorated
Solution Approach 1:
A polyester-based adhesive powder is applied around the reinforcing fiber upon manufacture of the fiber reinforced polymer strip to strengthen the adhesiveness with the polymer resin. The adhesive powder acts as an intermediary substance that improves the bonding between the fiber and resin without requiring high-temperature extrusion that would damage the fibers.
Solution Approach 2:
The invention changes the adhesion mechanism from high-temperature thermoplastic bonding to low-temperature adhesive powder bonding. This parameter change allows the reinforcing fibers to remain undamaged while achieving sufficient adhesion between strips.
2Device complexity
If the geogrid has a planar structure, then the manufacturing is simple, but the friction characteristics and shape stability against vertical load are poor
Solution Approach 1:
The invention transforms the planar geogrid structure into a three-dimensional lattice structure by adding vertical strips that intersect with horizontal strips at multiple points. This dimensional change improves friction characteristics and shape stability against vertical loads while maintaining manufacturing simplicity.
3Reliability
If the polyester-based adhesive powder is applied around the reinforcing fiber, then the adhesiveness with polymer resin is strengthened and self-durability is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The adhesive powder is applied around the reinforcing fiber upon manufacture of the fiber reinforced polymer strip, before the strip is used in geogrid construction. This preliminary application of adhesive ensures improved adhesion and durability without requiring additional complex manufacturing steps during geogrid production.
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 provides a geogrid with improved tensile strength, low tensile strain, and creep strain properties, along with enhanced construction resistance and shape stability, suitable for civil engineering applications.
Implementation Method 1
a polyester-based adhesive powder is applied around a reinforcing fiber upon manufacture of the fiber reinforced polymer strip to strength the adhesiveness with a polymer resin coated on the reinforcing fiber
Implementation Method 2
neither the warp-directional polymer strip nor the weft-directional polymer strip are in a molten state, and as a result, complete adhesion between the strips is not achieved
Data Source
Figure 1
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Figure 4~5b
AI summary
The present invention relates to a durability-enhanced fiber reinforced polymer strip including: an aggregate of a plurality of fibers as a reinforcing material; a thermoplastic polymer resin as a coating material; and an adhesive using an adhesive powder and disposed on the reinforcing material surface, wherein when applied around a reinforcing fiber upon manufacture of the fiber reinforced polymer strip, the adhesive powder can strengthen adhesiveness between the reinforcing fiber and the polymer resin to be applied thereon, whereby the polymer strip has improved self-durability.