The appearance of laminated iron is an inevitable result of the development of science and technology

The appearance of laminated iron is an inevitable result of the development of science and technology, and it has brought hope and confidence to the printing and canning industry.

One, tinplate

Since the birth of tinplate, it has been developing in the direction of thinning. One is to use less tin or even tin (chrome-plated iron). One is to reduce the thickness of the base plate of tinplate. The purpose is to adapt to changes in canning products and reduce the cost of can making.

1. Tin-plated layer: The hot-dip tinplate of the 50's developed into the current electroplated tinplate. Now China has not seen the use of hot dip tinplate in making cans. To be familiar with tinplate

The history of the list is as follows:

Hot dip tinplate tin plating amount:

Code number of tin plating (two sides) g/m2 China Call Application Example

H12/1224

H14/1428

H15/1530 1.5 pound tin fruit and vegetable, meat

H17/1733.6

Tin plating amount of electroplated tinplate:

Code Tin Plating Capacity (per side) g/m2 China Call Application Example

10#1.1/1.110 No. 100 tin quantity is used for canning of mushrooms, fruits, etc. Generally, tin iron below 50 tin is used for iron-iron coating processing.

25#2.8/2.825

50#5.6/5.650

75#8.4/8.475

100#11.2/11.2100

2,

Substrate thinning: This is a common wish for all people. At present, 0.15m/m tinplate has been used in China to make lids. Some cold-rolled sheet companies have announced that they can produce 0.12m/m cold-rolled sheet for the capping industry. Therefore, the secondary cold-rolled tinplate with thinned substrate and enhanced hardness is the development direction of can making (cover) industry.

The list of tempering grades for tinplate in the world is as follows:

Secondary cold rolled tinplate:

Traditional symbol current symbol HR30T value tensile strength (MPA) use

DR8DR55073550+70 round can body, bottom, cover

DR9DR62076620+70 round can body, bottom, cover

DR9MDR66077660+70 bottom and cover of beer and carbonated beverage cans

One cold rolled tinplate:

T1T5052330 extremely harsh deep drawing

T2T5252350 deep draw

T2.5T5555 general use

T3T5757370 general use, cans do not plan??

T4T6161415 is generally used, rigid, requiring rigid bottom, lid, shallow flush tank, etc.

T5T6565450 Warp resistant, requiring rigid base, cover, can body

T6T7070530 rigid, beer, carbonated beverage can bottom, cover

For the same tank type, the cold rolling of tinplate can be used for thin thickness generation to increase the utilization of tinplate.

3,

Chromium-plated iron: This is the Wuxi steel sheet, which has been in an awkward state since it was promoted to China in the 1980s. It was not widely used until after 2000. Even this year, the price of chrome-plated iron is more expensive than that of tin-plated iron. The reason is: Chrome-plated iron is significantly superior to tin-plated iron in the processing properties of the printed iron coating. With the widespread use of coating iron, especially in the cap, chrome-plated iron has received more attention from people. The characteristics of chrome-plated iron are:

(1) The canning process and corrosion resistance of the substrate are the same as those of the tinplate;

(2) In the coating process, it is not necessary to consider the problem of tin melting like tinplate, and a higher baking temperature can be used to increase the printing and coating production efficiency;

(3) Adhesion to coating is better than tinplate;

(4)

The surface is a very thin layer of metal chromium and hydrated chromium oxide, and the thickness is only about 1% of the tin tin layer. Therefore, it is easy to rust. Therefore, there is no practical value of chrome plating without coating processing.

(5) Since it is a thin sheet of Wuxi, it has saved tin resources and is in line with the development direction of tinplate.

Tinplate and chrome iron performance comparison:

Performance Tinplate Chrome Iron

Exterior

No printed AC

There are printed AB

Iron (paint) CA

Film dense CA

Pull-out CA

Processability (stretching) CD

Impact resistance BB

The proportion of 7.87.8

Heat resistance 232 °C tin melting stable

Sulfur resistance DA

Resistant to acid and high tin content do not have to be printed and can be used after printing B