Providing high-quality, heavy-duty coating with a dedicated surface preparation workshop before painting.

Yoshida Co., Ltd.

Company website

1-3-42 Nishinodoi-cho, Niihama, Ehime 792-0035

TEL (0897) 33-8851 FAX (0897) 34-5127

Certified products and technology
Heavy-duty coating technology using sandblasting
Yoshida Co., Ltd. 1

Yoshida was established in 1948 when the founder, who worked as a painter in Osaka, set up a painting workshop in Niihama City to take on painting jobs from Sumitomo Heavy Industries Ltd. Today there are two workshops in operation, the Niihama Workshop (within Sumitomo Heavy Industries Ltd.) and the Saijo Workshop (within Ehime Rinkai Danchi), which are capable of painting large, heavy items.

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The type of painting that is Yoshida’s area of expertise called heavy-duty coating technology to protect iron. President Tatsuya Yoshida explains that he began honing his skills for this technology after being presented with an opportunity to learn more through a job involving painting a Sumitomo Heavy Industries Ltd. crane. While the thickness of ordinary painting is in the range of 30 to 50 microns, heavy-duty coating prevents the ingress of air and water with a special 100 to 300 micron thick coating achieved through a chemical reaction by mixing the base material with a hardening agent. The technology is essential for coating steel products used in coastal areas, which main include ship rigging, lifting equipment, beams and shipping cranes.

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The painting process requires preparing the surface with an roughened surface to make the paint adhere easier. “The surface needs to be prepared properly, otherwise even the best quality paints will peel off” explains Yoshida. There are numerous methods available for preparing the surface, however Yoshida uses a technique called ‘sandblasting’ to roughen up the surface by blowing sand on the iron surface at high speed. Many jobs involve shipbuilders and beams, and the Saijo Workshop that covers sandblasting has one 10-ton crane and two 2.8-ton cranes to handle such large, heavy items. There are also four mobile tent housings available that allow painting work to proceed regardless of weather conditions, as part of a production system that can cater to a wide variety of requirements. Yoshida is adamant that there are few small businesses with such equipment and facilities, as sandblasting requires a lot of space and treatment of large quantities of sand residue. The complex shapes of some jobs means that work is completed by hand. Visibility is poor when wearing protective gear, and this is where the years of experience and a high level of skill shine through.

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Sandblasting produces more than 100 truck loads of sand residue every year, and this needs to be disposed of as industrial waste material. “Disposal costs amount to several million yen per year.” Yoshida is looking into installing equipment that can remove waste material from the residual sand to help recycle sand that has been used, however is making moves to reusing the sand for secondary applications such as concrete material. If this method proves successful, it will help create a new line of business as well as make a major contribution to the environment.

Yoshida is currently operating mainly in the Toyo region, but Yoshida outlines his grand vision of “covering all of Shikoku, expanding business to the Chugoku region and even southeast Asia into the future.”

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