The Two Streams of Nambutekki Manufacturing

In the world of Nambutekki manufacturing, two main currents of production flow side by side.

The first is the traditional, hands-on approach to crafting iron kettles, a process designated as a National Traditional Craft, where skilled artisans meticulously carry out the majority of the steps by hand. The other is the "Namagata" (green sand mold) technique, a method that streamlines certain steps to produce goods more efficiently.

The coexistence of these two approaches is a direct response to changing times. In the post-war era, as cookware materials shifted toward aluminum and stainless steel, demand for iron products plummeted. To survive, the industry couldn't just rely on traditional kettles; it had to innovate, venturing into new product development like modern kitchenware and decorative pieces.

Preserving tradition while embracing innovation—this very mindset is what sustains the diverse and vibrant product lineup of Nambutekki today.

A Symphony of Over 160 Handcrafted Steps: The Profound 'Yakigata' Method

The creation of traditional Nambutekki, particularly iron kettles, relies on an ancient method called "Yakigata" (fired mold). This process involves an astonishing 160 to 165 steps—or even more—almost all of which are performed by hand.

It's a series of tasks that can take over a month to complete, a true testament to the artisan's accumulated experience and intuition.

Artisans certified as Traditional Craft Masters are expected to have the skill to perform every single one of these steps on their own. Within this complex process, a few key stages are especially critical in determining the final quality of the piece.

The 'igata-zukuri' (mold making) is the very foundation of the process, defining not only the shape of the Nambutekki but also the delicate expressions on its surface.

While the mold, a mixture of river sand and clay, is still damp, the artisan painstakingly presses in patterns like the iconic "Arare" (hailstone) design. Using a special stylus, each tiny dot is applied by hand. Creating the perfectly aligned vertical, horizontal, and diagonal lines of the Arare pattern is an incredibly demanding task that requires unwavering concentration.

Next is the 'ikomi' (casting) stage, where molten iron ('yu'), glowing a brilliant orange at temperatures between 1,300 and 1,500 degrees Celsius, is poured into the mold.

One artisan recalls their first time witnessing this moment: "It was as if a soft, orange liquid, more fluid than water, was being smoothly drawn into the black mold." This instantaneous creation of the kettle's form is arguably one of the most dramatic moments in the entire manufacturing journey.

Once freed from its mold, the raw ironware is highly susceptible to rust. To combat this, a unique Nambutekki process known as "kanakedome" or "kamayaki" (kiln firing) is employed.

This technique involves firing the ironware in a charcoal fire at 800 to 1,000 degrees Celsius. This creates a dense, protective film of triiron tetroxide (Fe3O4)—commonly called "black rust"—on the surface. This black rust layer acts as a powerful barrier, preventing the formation of the corrosive red rust.

Finally, after any excess material is ground away in a polishing phase, the piece undergoes "coloring." In this step, materials like 'urushi' (Japanese lacquer) are baked onto the surface, giving the ironware its characteristic deep color and lustrous sheen, marking its completion.

The Essence of Craftsmanship: Castings as a Mirror of the Maker's Skill

Among all the steps in the process, mold making is where an artisan's true skill is put to the test.

One of the master artisans we interviewed shared, "With castings, you can never create a great piece by pure chance."

If the mold isn't perfect, you'll never get a good product. He explained the harsh reality that if you fail, it's entirely your own fault—you can't blame anyone else.

A casting is an honest mirror, reflecting the maker's skill and sincere dedication just as they are.

Mastering these complex techniques and earning recognition as a full-fledged artisan takes many long years. It was once a world where it was said, "it takes ten years to become a true craftsman." However, with the growing importance of training the next generation, the system is shifting to guide apprentices to handle all the processes within three to five years.

Even so, there's a realm of "tacit knowledge" that words can't fully capture—like judging the temperature by the color of the molten iron or checking the consistency of the sand by touch. This is something that can only be mastered through daily, dedicated practice.

The Role of "Namagata" in the Modern Production System

On the other hand, to bring the appeal of Nambu Tekki to a wider audience, a method known as the "namagata technique" (green sand casting) plays a crucial role in modern production.

This method boosts production efficiency by partially automating processes like mold making. It's this very technology that allows for a stable supply of diverse products, from frying pans suited to modern lifestyles to the colorful teapots that are highly popular overseas.

However, even with automation, it's true that human hands are still involved in many steps. The skills and knowledge cultivated through traditional manufacturing methods are what truly underpin the quality of this modern production system.