Food Grade Tinplate Sheets / Coils for Canned Dairy Products Packaging SPTE TFS
SPTE (tinplate)
1. Material characteristics: SPTE is electroplated tin steel sheet, commonly known as tinplate, which is a cold-rolled low-carbon thin steel sheet or steel strip plated with commercial pure tin on both sides. It has the characteristics of corrosion resistance, non-toxicity, high strength and good ductility. It can effectively prevent dairy products from contacting with external air and moisture, avoid deterioration, and ensure product quality and safety.
2. Structural composition: It is mainly composed of five layers: steel substrate, tin-iron alloy layer, tin layer, oxide film and oil film. Among them, the steel substrate provides strength and processing performance, the tin layer plays the main role in corrosion prevention, the tin-iron alloy layer enhances the bonding force, and the oxide film and oil film further improve the rust prevention and lubrication performance.
3. Production process: The production process includes steelmaking, hot rolling, pickling, cold rolling, continuous annealing, flattening, steel coil preparation line, electroplating, oiling and other links. By strictly controlling the process parameters of each link, the product quality is ensured to be stable. For example, the thickness and uniformity of the tin plating layer can be accurately controlled in the electroplating link.
4. Application advantages: In terms of canned dairy product packaging, its good sealing can prevent dairy product leakage and external pollution; light-shielding property helps protect the nutrients in dairy products from light damage; and firmness ensures that the packaging is not easily damaged during transportation and storage.
TFS (chrome-plated plate, tin-free steel plate)
1. Material characteristics: TFS is a new type of canning material developed for the situation of limited metal tin resources and high cost. It has the advantages of low price and strong coating adhesion, but its corrosion resistance and appearance gloss are not as good as tin-plated plate, and it cannot be soldered at present, and can only be overlapped by resistance welding or bonding.
2. Structural composition: It is usually composed of a steel substrate and a chrome-plated layer. The chrome-plated layer provides certain corrosion resistance and decorative properties.
3. Production process: The production process includes the main steps of substrate preparation and chrome plating. The specific process involves surface cleaning, pretreatment, chrome plating liquid composition control, electroplating parameter adjustment, etc., to ensure the quality and performance of the chrome plating layer.
4. Application advantages: For some canned dairy products that are cost-sensitive and do not require high corrosion resistance, TFS is an optional packaging material. Its strong coating adhesion is conducive to diversified surface decoration and printing, improving the aesthetics of product packaging.
1.ETP& SPTE
|
Former Coating
Designation
|
Coating Weight
Code
|
Nominal Coating
Weight(g/m2)
|
Minimum Average Coating weight(g/m2) |
Equally Coated
|
10# |
1.1/1.1 |
1.1/1.1 |
0.9/0.9 |
20# |
2.2/2.2 |
2.2/2.2 |
1.8/1.8 |
25# |
2.8/2.8 |
2.8/2.8 |
2.5/2.5 |
50# |
5.6/5.6 |
5.6/5.6 |
5.2/5.2 |
75# |
8.4/8.4 |
8.4/8.4 |
7.8/7.8 |
100# |
11.2/11.2 |
11.2/11.2 |
10.1/10.1 |
Differentially Coated
|
25#/10# |
2.8/1.1 |
2.8/1.1 |
2.5/0.9 |
50#/10# |
5.6/1.1 |
5.6/1.1 |
5.2/0.9 |
50#/25# |
5.6/2.8 |
5.6/2.8 |
5.2/2.5 |
75#25# |
8.4/2.8 |
8.4/2.8 |
7.8/2.5 |
75#50# |
8.4/5.6 |
8.4/5.6 |
7.8/5.2 |
100#/25# |
11.2/2.8 |
11.2/2.8 |
10.1/2.5 |
100#/50# |
11.2/5.6 |
11.2/5.6 |
10.1/5.2 |
100#/75# |
11.2/8.4 |
11.2/8.4 |
10.1/7.8 |
2. TFS
Metallic Chromium Layer(one side) |
Chromium Oxide Layer(one side) |
Minimum Average
Coating Weight
|
Maximum Average
Coating Weight
|
Minimum Average
Coating Weight
|
Maximum Average
Coating Weight
|
50mg/m2 |
150mg/m2 |
5mg/m2 |
35mg/m2 |



Application of Tinplate

