Enamel sintering
The company has newly introduced an enamel sintering production line featuring German technology, complete with 22 automatic temperature-control zones. This ensures more uniform and stable sintering temperatures. The sintering chain speed and sintering temperature are both controlled via an automatic LCD touch screen, enabling more precise numerical control and minimizing the discrepancy between the actual and measured temperatures.
The heat-insulating air curtain for the sintering production line features a top-and-bottom structural design and is equipped with a variable-frequency speed-regulating motor, allowing adjustment of the air output according to different process requirements. Its unique turbine blade design and highly efficient wind resistance plates effectively prevent the detachment of electrostatically charged powder. The firing conveyor chain uses a heavy-duty precision-forged chain and is fitted with a stable positioning device to ensure optimal chain stability.
In terms of energy conservation, we employ shorter low-voltage-side power supply cables, high-quality dry-type transformers, higher power utilization efficiency, more stable voltage and current, and reduced voltage drop. The electric heating elements are made from premium nickel-chromium alloy materials, offering even greater thermal efficiency. For the sintering line’s insulation and heat-retaining materials, we select high-purity alumina ceramic fibers with exceptional quality and a thickness of up to 350 mm, providing superior thermal insulation, a more stable firing environment, and enhanced environmental friendliness.
Based on years of sintering experience and in compliance with relevant ISO standards, the company has developed the first “Enamel Sintering Process Manual for Heat Exchangers.” In its sintering production, the company employs a “low-temperature, long-duration sintering” process. This process allows sufficient release of hydrogen from the steel plate, thereby effectively preventing potential flaking or blistering on the enamel surface. Moreover, key inorganic components such as silicon dioxide, cobalt oxide, and nickel oxide are fully melted and dissolved, enhancing the adhesion between the steel plate and the enamel coating. As a result, the enamel coating exhibits a broader thermal expansion coefficient and improved elasticity. The sintering temperature is controlled using a curve-based temperature profile, gradually heating the workpieces. This approach promotes the sintering reaction between the enamel and the steel plate, leading to products with minimal color variation, high surface gloss, no buildup, no pinholes, no copper heads, and a low rate of needle holes.
At the sintering production site, semi-finished products must be dust-free, and finished products must be free of any contact with the ground or contamination, ensuring the high-quality appearance of the products. During finished-product inspection, every single item must be thoroughly checked according to process requirements, and everyone is expected to act as an inspector, thereby completely eliminating the shipment of nonconforming products.
The company operates two sintering production lines with a daily output capacity of up to 20,000 square meters, fully capable of meeting customer needs. Both lines are suitable for firing workpieces coated using dry-process enamel application, wet-process enamel application, and combined dry-and-wet enamel application methods.
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