PC Strand Rustproof Film Formation via Preheating
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Solution Overview
Problem
Conventional methods for forming rustproof films on PC strands are limited by low process line speeds, which result in poor productivity and increased costs, while also compromising the flexibility and adhesion strength required for the strands.
Innovation Solution
A method involving pre-heating and post-heating steps with a heat-curable synthetic resin powder coating material, applied at a higher pre-heating temperature than post-heating, and a line speed of 5 to 10 m/min to achieve a uniform film thickness of 100 to 280 µm, maintaining the PC strand's flexibility and adhesion strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rustproof processing methods are used to form films on PC strands, then rustproofing is sufficient and flexibility is maintained, but the process line speed is limited to about 4.5 m/min or less, resulting in poor productivity
Solution Approach 1:
The PC strand is preheated to a specific temperature range (50-150°C) before the powder coating is applied. This preliminary heating action prepares the surface and enables the coating to form properly at higher line speeds, resolving the contradiction between maintaining rustproofing quality and increasing productivity.
Solution Approach 2:
The invention changes the temperature parameter by preheating the PC strand to 50-150°C before coating. This parameter change allows the powder coating to cure properly at higher line speeds (5-15 m/min) while maintaining film quality, thus improving productivity without sacrificing rustproofing performance.
2Productivity
If the process line speed is increased above 4.5 m/min to improve productivity, then production efficiency increases, but the intended film thickness cannot be provided, compromising rustproofing performance
Solution Approach 1:
Preheating the PC strand before coating ensures that the powder coating material can properly melt and form uniform films even at higher line speeds. This preliminary thermal preparation maintains manufacturing precision for film thickness while enabling increased productivity.
Solution Approach 2:
By changing the temperature parameter through preheating to 50-150°C, the invention enables the coating process to maintain proper film thickness control at line speeds of 5-15 m/min, resolving the contradiction between productivity and manufacturing precision.
3Reliability
If a thicker protective film of 250 μm or more is formed to prevent damage in special structures, then rustproofing performance improves, but flexibility and productivity are impaired
Solution Approach 1:
The preheating parameter change to 50-150°C enables the formation of thick protective films (250 μm or more) at higher line speeds. This resolves the contradiction by allowing adequate film thickness for damage resistance while maintaining productivity through improved curing efficiency at elevated temperatures.
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
This method efficiently forms a uniform and desirable rustproof film with improved productivity and cost-effectiveness, enhancing the tensile fatigue characteristics and adhesion strength of the PC strand without impairing its flexibility or shear resistance.
Implementation Method 1
a heating step of heating the core wire and the surrounding wires in the untwisted state; a cooling step of cooling the core wire and the surrounding wires with the synthetic resin powder coating material uniformly adhered thereon after the coating step and the heating step so as to form a resin film
Data Source
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AI summary
Provided is a method for the highly efficient formation of a uniform, high-quality film with which increased line speed, improved productivity, and cost reduction can be envisaged. A method for forming a rustproof film on a PC strand, wherein a PC stranded (1) is untwisted to separate surrounding wires (1b) from a core wire (1a), a synthetic resin powdered coating material is uniformly adhered by being applied and heated over the outer periphery of the core wire and surrounding wires in this untwisted state, the product is cooled to form a resin film (26), and then the surrounding wires are twisted back to the original state with respect to the core wire. Pre-heating is performed before the coating step and post-heating is performed after the coating step, the pre-heating temperature is set 30 to 130°C higher than the post-heating temperature, a synthetic resin powdered coating material having an average grain size of 40 to 50 µm is used, and the process line speed is 5 to 10 m/min.