Coating process for Buke printing on tin cans

Coating process for Buke printing on tin cans

Canned containers made of tinplate usually require the removal of a certain coating on their inner surface to prevent chemical reactions and trace harmful substances between the head and the can wall from contaminating the contents,

Protect the freshness and original flavor of the contents, allowing canned food to be stored, transported, and sold for a long time without affecting its edible value.

The coating on the inner surface of canned containers is applied using a rolling coating machine before cutting the tin into cans and returning the material. The rolling coating machine can independently perform the coating operation through its own feeding device,

It can also be matched with a metal printing and testing machine to form a printing and coating operation line. The tinplate after coating is driven by a circulating chain and cured at high temperature in a drying room.

One share consists of three parts: preheating, constant temperature baking, and cooling. The entire baking time requires 10-15mm. After that, an automatic unloading machine is used to remove the iron sheet. After the coating is inspected and passes the physical and chemical tests, it is transferred to the printing and canning process

The internal coating should have corrosion resistance, good adhesion, flexibility, and be non-toxic and odorless. The coating must be able to withstand the heating during high-frequency resistance welding and the high temperature, high pressure, and cooking after canning without losing its performance.

In addition, the type of coating and the thickness of the coating must be determined based on the contents of the can.

Coating process for Buke printing on tin cans