Gasket Packing Q&A No.14: What is stress relaxation?
What is stress relaxation? How can stable sealing be achieved?
I will explain the basics for achieving stress relaxation and stable sealing properties. ◆ What is stress relaxation? 〇 It refers to the reduction of stress in the gasket due to the deterioration or deformation of the gasket material. A high relaxation rate makes it easier for bolts to loosen. ◆ Countermeasures 〇 Use a thinner gasket. 〇 Change to a material with higher heat resistance. ◆ Requirements for sealing materials 〇 High-temperature characteristics, creep resistance, strength, etc. * The thicker the sheet, the greater the stress relaxation rate, as there are more points of structural failure (proportional to thickness and volume).
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■Things to be careful about with non-asbestos joint sheets 〇 Tighten with sufficient force from the beginning 〇 Do not retighten after a period of time following temperature rise → The gasket hardens due to heat, and retightening after hardening may lead to gasket breakage which is a concern 〇 When used for steam seals, special care is needed as hardening is more likely to occur → Compared to asbestos joint sheets, higher tightening force is required, and the lifespan is also shorter
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Daiko is a manufacturer specialized in processing various industrial products, including gaskets and packing. With industry-leading processing equipment, including one of Japan's largest water jet cutting machines, and a wide range of materials such as joint sheets, rubber, resin, and metal, we meet our customers' diverse needs. Leveraging the technology and experience we have cultivated over 50 years, we provide high-quality, short-lead-time, and low-cost products to contribute to solving our customers' challenges. To respond to our customers' varied needs, Daiko's production bases are equipped with various processing facilities. Among them, the water jet cutting machines, with a total of four installed at our Osaka headquarters and Tokyo branch, boast one of the largest scales in the country. The maximum processing range is W4,000 × L5,500 mm, allowing for the high-precision manufacturing of large-diameter gaskets and packing. By maximizing material efficiency, we achieve the provision of 'high quality at low cost.'