What is the reason for needing air vent holes in hollow products during fluororesin coating?
Explanation of important points to prevent damage accidents caused by air expansion during the firing of fluororesin coatings and PEEK coatings.
In fluororesin coatings and PEEK coatings, high-temperature heating is performed during the firing process, which may require "vent holes" for hollow structures. When heating in a sealed space, the internal air expands, increasing the internal pressure, which can lead to serious issues such as deformation or rupture. This article clearly explains the reasons why vent holes are necessary and the points to check during the design phase.
basic information
In functional coatings involving high-temperature sintering, measures against air expansion in hollow parts are essential. Particularly with PTFE, PFA, and PEEK coatings, sintering is conducted at temperatures close to 400°C, which causes a significant increase in pressure within the sealed space. This can lead to risks such as substrate expansion, deformation, coating cracking, and bursting accidents. To prevent these issues, it is necessary to appropriately provide openings (air vent holes) to allow the expanded air to escape. It is important to verify not only the diameter and position of the holes but also that the internal space is reliably interconnected.
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Applications/Examples of results
In products like the following, air release design is important: - Welded structures - Sealed tanks - Box-shaped components - Hollow rolls - Pipe jigs - Machine frames - Jigs for heat treatment In practice, there are cases such as "it looks connected on the outside but is blocked inside" and "holes were sealed after painting." Our company conducts product drawings and structural confirmations, and we propose coating specifications that consider safety and quality during firing.
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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.