The hottest metal container packaging material tin

Metal container packaging material - tinplate

if you understand the development history of tinplate,

if you master the application characteristics of tinplate,

if you know the bottleneck of tinplate can making industry,

the emergence of laminated iron is the inevitable result of the development of science and technology, and it brings hope and confidence to tinplate can making industry

I. tinplate

since the advent of tinplate, it has been developing in the direction of thinning. One is to use less tin, or even tin (chromium plated iron), and the other is to reduce the thickness of the base plate of the tinplate. The purpose is to adapt to the changes of canning products and reduce the cost of canning

1. Tin plating layer: from hot-dip tinplate in the 1950s to current electroplated tinplate, we can no longer see the use of hot-dip tinplate in can making in China. In order to get familiar with the historical overview of tinplate, the list is as follows:

tin plating amount of hot-dip tinplate:

code tin plating amount (both sides) g/m2 Chinese address application example

H12/12 24

h14/14 28

H15/15 30 1.5 pounds of tin fruits and vegetables Meat

h17/17 33.6

tin plating amount of electroplated tinplate:

code tin plating amount (each side) g/m2 application example of Chinese appellation

10 # 1.1/1.1 No. 10 except that No. 100 tin is used for canned mushrooms, fruits and so on, Generally, iron with less than 50 tin is used for iron printing coating processing

25# 2.8/2.8 25

50# 5.6/5.6 50

75# 8.4/8.4 75

100# 11.2/11.2 1. This will also provide inexhaustible development momentum for the extruder industry 00

2. Substrate thinning: This is a well-known wish, which has been used in China at present.Cover with 15m/m sheet. 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 sheet with thin substrate and enhanced hardness is the development direction of can making (cover) industry

the quenching and tempering degree grades of tinplate in the world are listed as follows:

secondary cold rolled tinplate:

traditional symbol current symbol hr30t tensile strength (MPA) purpose

DR8 DR550 73550+70 circular can body, bottom, cover

dr9 dr62076620+70 circular can body, bottom, cover

dr9m dr660 77660+70 take the tail light of a single car as an example, the bottom of beer and carbonated beverage cans Cover

one time cold rolled sheet:

T1 T50 52330 extremely harsh deep drawing

T2 T52 52350 deep drawing

t2.5 t55 55 is generally used

T3 t57 57370 is generally used, and the tank body is not scratched

T4 T61 61415 is generally used, which is relatively rigid, requiring rigid bottom, cover, shallow flushing tank, etc.

T5 T65 65450 anti warping, requiring rigid bottom, cover, and tank body.

T6 T70 70530 is very rigid, and the bottom of beer and carbonated beverage cans Cover

for the same can type, the secondary cold-rolled sheet can be used to replace the thick with the thin through the efforts of these two aspects, so as to improve the utilization rate of the sheet

3. Chromium plated iron: Wuxi steel sheet has been in a wandering state since it was popularized to China in the 1980s. It was not widely used until 2000. Even this year, the price of chromium plated iron will be higher than that of tin plated iron. The reason is that the processing performance of chromium plated iron in iron printing coating is obviously better than that of tin plated iron. With the wide use of coated iron, especially in bottle caps, chrome plated iron has attracted more attention. The characteristics of chrome plated iron are:

(1) the can making processing and corrosion resistance of the substrate are the same as those of tinplate

(2) in coating processing, it is unnecessary to consider the problem of tin melting like tinplate, and a higher baking temperature can be used to improve the printing and coating production efficiency

(3) the adhesion to the film is better than that of tinplate

(4) its surface is a very thin metal chromium layer and hydrated chromium oxide layer, and the thickness is only about 1% of the tin layer of tinplate. Therefore, it is very easy to rust. Therefore, without coating processing, there is no practical value of chromium plated iron

(5) because it is Wuxi sheet, tin resources are saved, which is in line with the development direction of tinplate

performance comparison between tinplate and chromium plated iron:

performance tinplate chromium plated iron

appearance

no printing a C

with printing a B

printing iron (coating) C a

film compactness C a

drawing C a

processability (tensile) C d

impact resistance B B B

specific gravity 7.8 7.8

heat resistance 232 ℃ tin melting accurate stress-strain curve can reproduce the experimental process stable

sulfur resistance d a

acid resistance high tin content does not need to be painted can be used after painting B

(a-excellent b-good c-medium d-poor)