Multilobal Reinforcing Fiber Curved Projections
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Solution Overview
Problem
Existing cement reinforcing fibers require complex processes and increased costs to achieve sufficient physical bonding with hardening materials, and their effectiveness in reinforcing cured articles is limited due to issues with deformation and removal.
Innovation Solution
Cured article reinforcing fibers with a multilobal cross section featuring three or more projections, where at least one projection has a substantially curved end and a base part narrower than the end, enhancing physical bonding and engagement with hardening materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fibers are made with high strength and resistance to deformation through narrow molecular weight distribution and high stereoregularity, then fiber strength is improved, but the fibers become resistant to physical external pressure and difficult to bond with hardening materials
Solution Approach 1:
The fiber cross-section is designed with non-uniform structure featuring a central core and peripheral shell with different properties. The peripheral shell has lower crystallinity and higher porosity to enhance bonding with hardening materials, while the central core maintains high crystallinity and strength. This local differentiation allows simultaneous achievement of high fiber strength and improved bonding capability.
Solution Approach 2:
The fiber is constructed as a composite structure combining multiple phases: a high-crystallinity polypropylene core providing strength, and a low-crystallinity polypropylene shell providing bonding capability. The composite structure integrates the advantages of both crystalline and amorphous regions within a single fiber, resolving the contradiction between strength and bonding.
2Stability of the object's composition
If calcium carbonate fine powder is blended into the resin to form ionic bonds with alkali metal salt of alkyl phosphate, then fiber dispersibility in cement slurry is improved, but the reinforcing effect on cured article is insufficient
Solution Approach 1:
The fiber structure is designed with the peripheral shell specifically optimized for bonding interactions with hardening materials, while the central core maintains structural integrity. This local differentiation ensures that the bonding-enhancing features (lower crystallinity, higher porosity in shell) are concentrated where needed for reinforcing effect, rather than uniformly distributed throughout the fiber.
Solution Approach 2:
The fiber cross-section incorporates curved surfaces and rounded features that enhance contact area with hardening materials. The peripheral shell's curved geometry increases the surface area available for bonding interactions, improving the reinforcing effect while maintaining dispersibility through the controlled porosity and surface characteristics.
3Strength
If fibers are given unevenness on the projecting ends to enhance physical bonding to cement, then bonding capability is improved, but the process becomes complicated and cost increases
Solution Approach 1:
The bonding-enhancing features are built into the fiber structure during the spinning process itself, rather than being added as a separate post-processing step. The peripheral shell with lower crystallinity and controlled porosity is formed inherently during fiber manufacture, eliminating the need for subsequent treatment processes to create bonding surfaces.
Solution Approach 2:
The fiber manufacturing process controls crystallinity and porosity parameters during spinning to create the optimal peripheral shell structure for bonding. By adjusting spinning conditions and resin composition parameters, the fiber is formed with pre-existing bonding-capable surfaces, avoiding complex post-processing operations.
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 fibers demonstrate high bending strength and improved bonding with hardening materials, resulting in enhanced reinforcement of cured articles, particularly in hydraulic materials like concrete and mortar.
Implementation Method 1
at least one of the projections has a substantially curved end part... enhancing physical bonding and engagement with hardening materials
Implementation Method 2
multilobal cross section with three or more projections... enhanced physical bonding
Data Source
AI summary
The present invention provides cured article reinforcing fibers having a shape advantageous in physically bonding the fibers to a hardening material or bringing the fibers into engagement with the hardening material, and also provides a cured article using the fibers. The cured article reinforcing fiber of the present invention has a multilobal cross section with three or more projections. At least one of the projections has a substantially curved end part, and a base part situated toward the center of the fiber has a width smaller than the largest width of the end part. Thus, the fiber particularly has high bending strength. Further, the cured article of the present invention includes a mixture of the cured article reinforcing fiber and a hardening material, and the hardening material has been cured.