The Kudamatsu Plant is a major production base of Toyo Kohan.
We are located in Kudamatsu City, Yamaguchi Prefecture where nature is still abundant. In 1934, with the dream of “Making Japan self-sufficient in tinplate,” our engineers brought a burning spirit to this city and started production.
We can stably supply high quality products to meet any customer's needs. This is possible because we have all the facilities necessary to conduct R&D, production, shipment and even environmental preservation. These facilities include a technical research laboratory, production lines, harbor facilities to directly handle the delivery of raw materials and supplies and ship products, an environmental management center, etc.
Continuous pickling line
This process is used to remove scales (oxidized iron) from the surface of hot coils.
Five-stand tandem cold rolling mill
Hot coil (thickness 1.6 to 3.5 mm) is rolled to a thickness of 0.15 mm to 1.6 mm according to the use.
Rolling oil that has become attached to the coil surface is washed off.
Then, it is softly annealed in the furnace.
Continuous annealing line
Interior of a batch annealing furnace
Double cold reduction mill
Coils are lightly rolled to prepare the surface shape, then they are given an appropriate roughness and hardness.
Surface treatment such as tin electroplating, electrolytic chromate processing and resin lamination are applied, and various products are made according to the uses. This is a process in which Toyo Kohan's originality stands out.
Tin plating is electrically applied to make tinplate.
A processing fluid with a zinc base and also containing cobalt and molybdenum is used for a combined electro-galvanizing process.
Nickel electroplating is conducted in this line. Non lustrous, semi lustrous and lustrous finishes can be applied to the plating by changing the plating fluid.
A special electrolytic process is used to make a strong coating of chromium metal and chromium hydroxides.
Polyester film that has excellent heat resistance, barrier forming properties and that is easy to fabricate is continuously attached with thermal compression bonding.
An organic film that allows high-class designs and functionality is applied.
Color Lamination Line
FINE CLAD line
This is an highly functional laminated material made with the surface activated bonding process under a highly vacuumed environment. Because a flat joint surface can be produced, the states of the materials, such as thickness and hardness, are usable as is, so that this material can be used in many fields, such as material for battery components, material for printed circuit boards, etc.
Fine Cast Film line
Polyester film that is made with the non-oriented film manufacturing method can be fabricated in ways that general purpose film cannot, and it forms a excellent bond with metals, so that it is used as the lamination film for making Hi-Pet, VINYTOP.
These are Magnetic Disk Aluminum Substrates made of aluminum disks, electroplated with nickel and then polished to a mirror finish. Although we have over 10 percent of the global market share, the uses of these disks has increased recently, so that in addition to computers they are now used in hard disk drive video recorders, car navigation systems, etc.
We are also providing our users with abrasion resistant, corrosion resistant and highly accurate long life machine components that are made with our hard materials, centering on our original KH alloy and including KW super-hard alloy and KA alumina-ceramics.