Precautions for fluoropolymer and PEEK coating on products with a hollow structure.
Design points to prevent bursting and deformation accidents that occur during fluororesin coating and PEEK coating.
In fluororesin coatings and PEEK coatings, the firing process involves heating to around 400°C, which poses a risk of deformation and damage due to the expansion of internal air in hollow structures. Particularly in cases where sealed spaces are formed, such as in pipe structures, welded frames, hollow shafts, and box-shaped components, the internal pressure can rise during heating, potentially leading to bulging, distortion, coating defects, and rupture accidents. This article explains the necessity of "vent holes" that should be considered when coating hollow structures, as well as common design oversights that can easily occur. We will introduce important points not only regarding coating quality but also from the perspective of ensuring safety.
basic information
In functional coatings such as PTFE, PFA, and PEEK, a coating film is formed through high-temperature sintering. Therefore, in substrates with sealed internal spaces, air expands during sintering, leading to an increase in internal pressure. If there is no escape for the pressure, problems such as deformation of the substrate, bulging at weld joints, cracking of the coating film, and poor coating quality may occur. Furthermore, an increase in internal pressure can lead to rupture accidents, making this a very important point of caution. Our company checks the substrate structure and drawings before coating to verify the presence of hollow parts or sealed spaces. We propose additional air vent holes or structural improvements as needed, supporting safe and stable coating processing.
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Applications/Examples of results
In products like the following, it is important to conduct prior checks to prevent issues related to hollow structures: - Welded frames - Pipe structural components - Hollow shafts - Box-shaped enclosures - Chemical tank components - Mechanical parts with internal spaces - Heat exchanger-related components In actual field situations, there are not infrequent cases where unintended sealed structures occur due to reasons such as "the hole was sealed in a later process," "the ventilation path disappeared due to changes in the drawings," or "the internal space was divided." To prevent such troubles, our company conducts structural checks from the pre-processing stage. We perform coating processes that ensure both safety and quality.
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Nikken Coating Industry Co., Ltd. has been a specialized manufacturer of functional coatings for contract processing, earning the trust of customers across various industries for 79 years since its founding. We leverage our processing technology to maximize the properties of fluororesins, such as non-stick, lubricity, and chemical resistance, providing high-performance coatings that directly address customer challenges, including "Thermo Pro Release" for thermal welding processes and "NonStick STC" for blades and precision molds. In recent years, in response to movements regarding regulations on fluorinated compounds (PFAS), "PEEK resin," which is gaining attention as a substitute for fluororesins, has become a focus. Nikken Coating Industry commercialized the world's first PEEK resin coating, "PEEKCOAT," in 1999. Based on the solid knowledge and know-how accumulated over more than 20 years, we are further intensifying our research and development efforts to explore the potential of next-generation PEEK coatings! We aim to be recognized as "the go-to for PEEK coatings" and will continue to lead the way. As "the best partner for functional coatings that builds trust through technology," Nikken Coating Industry will continue to contribute to the creation of high-quality, high-performance products.