Fiber-Reinforced Strand Twisting for Circular Cross-Sections
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Solution Overview
Problem
Conventional fiber-reinforced strand manufacturing methods often result in short twist pitches, leading to unstable quality due to non-circular cross-sectional shapes and variations in mechanical properties.
Innovation Solution
A method involving a resin bath with distinct impregnation and twisting regions, where the reinforced fiber bundle is twisted to satisfy the condition L³ ≥ P ≥ 3.1590 × dtex, ensuring a circular cross-section with a circularity variation of 5% or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reinforced fiber bundle is twisted with a short twist pitch after resin impregnation, then the manufacturing process is simpler and faster, but the cross-sectional shape becomes non-circular and quality becomes unstable
Solution Approach 1:
The resin bath means is divided into two distinct regions: an impregnation region where the fiber bundle is coated with resin, and a twisting region where the bundle is twisted to achieve circular cross-section. This segmentation allows each region to perform its specific function optimally without interfering with the other, resolving the contradiction between manufacturing speed and cross-sectional quality.
Solution Approach 2:
The invention specifies optimal parameter ranges for twisting (twist pitch P and twisting region length L) to achieve circular cross-sections. By controlling these parameters within defined ranges, the process maintains both manufacturing efficiency and product quality, transforming the quality issue from a variable problem to a controlled process parameter.
2Manufacturing precision
If the twist pitch is increased to achieve circular cross-section, then the manufacturing precision improves, but the device complexity increases
Solution Approach 1:
The resin bath means serves dual functions: it acts as both the impregnation medium (coating fibers with resin) and the twisting region (where circular cross-section is achieved). This multi-functionality eliminates the need for separate impregnation and twisting devices, reducing overall device complexity while maintaining manufacturing precision.
Solution Approach 2:
The impregnation process and twisting process are merged into a single integrated resin bath means. By combining these two operations in one device, the invention achieves circular cross-sections without requiring additional complex equipment, thus improving manufacturing precision without proportionally increasing device complexity.
3Device complexity
If conventional twisting methods are used, then the process is simpler, but external appearance defects and mechanical property variations occur
Solution Approach 1:
The invention establishes specific parameter ranges for twist pitch (P) and twisting region length (L) that must be satisfied to achieve circular cross-sections. By controlling these parameters within defined relationships, the process eliminates external appearance defects and mechanical property variations, transforming quality instability into a controlled, reliable process.
Solution Approach 2:
The invention provides a feedback mechanism through the defined parameter relationship between twist pitch and twisting region length. By monitoring and controlling these parameters to satisfy the specified equations, the process ensures consistent circular cross-sections and reliable quality, preventing defects before they occur rather than detecting them afterward.
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 produces high-quality fiber-reinforced strands with stable mechanical properties and circular cross-sections, eliminating external appearance defects and variations.
Implementation Method 1
a resin bath means storing a molten thermoplastic resin, thereby impregnating the reinforced fiber bundle with the molten resin
Data Source
AI summary
In a method of manufacturing a fiber-reinforced strand, the fiber-reinforced strand is so manufactured that the cross-section thereof becomes as circular as possible. Particularly a method of causing a reinforced fiber bundle 3 to pass through a resin bath means 7 and, thereafter, twisting the reinforced fiber bundle 3. The resin bath means 7 includes an impregnation region 21 where the reinforced fiber bundle 3 is impregnated with a thermoplastic resin 5 and a twisting region 22 where the reinforced fiber bundle 3 after the resin impregnation can be twisted, and the reinforced fiber bundle 3 after the resin impregnation is twisted in such a manner that a twist pitch P imparted to the reinforced fiber bundle 3 after the resin impregnation within a length L in the twisting region 22 satisfies L/3≧P≧3.15/90×(dtex)1/2.