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JIS G3303 DR-7M 1.1/1.1 Coating Electrolytic Tinplate used for Food Packaging
What is Tinplate?
Tinplate, also known as Electrolytic Tinplate (ETP), is a thin steel sheet coated with a layer of tin through an electrolytic process. The steel base gives the material strength and formability, while the tin coating provides excellent corrosion resistance, a non-toxic surface, and a shiny appearance, making it ideal for various applications, particularly in food and beverage packaging.
Structure of Tinplate
Tinplate is composed of several layers:
1. Steel Substrate: The core of tinplate is low-carbon steel, providing the necessary strength and durability.
2. Tin Coating: The steel sheet is coated with a thin layer of tin, which is applied through an electrolytic process. The thickness of the tin layer can vary based on the application, and it protects the steel from corrosion and gives a glossy finish.
3. Passivation Layer: After tinning, a passivation treatment (chromate coating) is often applied to enhance corrosion resistance and promote adhesion for further coatings, such as lacquers or paints.
4. Oil Coating (Optional): In some cases, a thin oil layer is applied to protect the tinplate from scratches and oxidation during storage and handling.
Key Characteristics of Tinplate
- Corrosion Resistance: Tinplate’s primary advantage is its corrosion resistance, provided by the tin coating. It prevents rust and other forms of deterioration when exposed to moisture, air, and certain chemicals.
- Non-Toxic and Food Safe: Tin is non-toxic and safe for food contact, making tinplate ideal for packaging food, beverages, and other consumable products.
- Formability: The steel substrate makes tinplate strong yet malleable, allowing it to be easily shaped into cans, containers, and other packaging products.
- Aesthetic Appeal: The tin layer gives the material a bright, shiny appearance, enhancing its visual appeal for consumer packaging.
- Recyclability: Tinplate is 100% recyclable, making it an environmentally friendly packaging material.
| GB/T2520, JIS G3303 | EN10202 | TARGET VALUE | TOLERANCE RANGE | YIELD STREGNTH/MPA | TENSILE STRENGTH/MPA |
| T-1 | TS230 | 49 | 49±3 | 230±50 | 325±50 |
| T-2 | TS245 | 53 | 53±3 | 245±50 | 340±50 |
| T-2.5 | TS260 | 55 | 55±3 | 260±50 | 360±50 |
| T-3 | TS275 | 57 | 57±3 | 275±50 | 375±50 |
| T-3.5 |
| 59 | 59±3 | 290±50 | 390±50 |
| T-4 | TH415 | 61 | 61±3 | 415±50 | 435±50 |
| T-5 | TH435 | 65 | 65±3 | 435±50 | 460±50 |
| DR-7M | TH520 | 71 | 71±3 | 520±50 | 540±50 |
| DR-8 | TS550/TH550 | 73 | 73±3 | 550±50 | 570±50 |
| DR-8M | TH580 | 73 | 73±3 | 580±50 | 590±50 |
| DR-9 | TH620 | 76 | 76±3 | 620±50 | 625±50 |
| DR-9M |
| 77 | 77±3 | 660±50 |
|
| DR-10 |
| 80 | 80±3 | 690±50 |
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| The hardness is the average value of 2 samples, allowing 1 of them to exceed the specified allowable range by 1 unit. | |||||
| a The yield strength is a reference value determined as required. b Yield strength is the average value of the two samples. The sample is P5 in GB/T 228, and the direction of the sample is transverse. c Due to the thickness thinning effect, the elongation is too low and the yield strength cannot be measured. In this case, the yield strength is replaced by the tensile strength. d For the tensile test, the width of the parallel part of the sample is (12.5±1) mm, and the standard distance L0=50mm. Before the test. The sample should be artificially aged for 20min at 200℃. | |||||
| Thickness | Tolerance | ||
| Negative Tolerance | Tolerance | Positive tolerance | |
| 0.18～0.55 SR | +1%～—3% | +2%～—2% | +0%～+3% |
| 0.15～0.34 DR | +1%～—3% | +2%～—2% | +0%～+3% |
| Remarks | The internal control is set at-0.002mm of the thickness of the contract order. The measurement value of the midpoint in the width direction of the strip shall prevail. | The internal control sets the thickness of the contract order thickness. The measurement value of the midpoint in the width direction of the strip shall prevail. | The internal control is to set the thickness of the contract order at +0.003mm, and the measured value at the midpoint of the strip width direction shall prevail. |
| 1. The thickness of S1, S2, S3 surface and M surface shall be measured by the flat thickness meter. (The matt surface will be higher than the actual measurement due to surface roughness.) | |||
| Available Width | Width Tolerance | |
| General order (normal production requirements) | High-precision ordering | |
| 750~1050mm | +0～+3( aim +0～+1.5) | +0～+2 (aim +0～+1.0) |
Applications of Tinplate (Electrolytic Tinplate) and Product Requirements
Tinplate (Electrolytic Tinplate, or ETP) is a versatile material used across various industries due to its unique combination of strength, corrosion resistance, formability, and aesthetic appeal. It is widely used in packaging, electronics, and manufacturing. Here’s a detailed overview of the applications of tinplate and the specific requirements for different products.
1. Food Packaging
One of the primary uses of tinplate is in food packaging due to its excellent barrier properties and corrosion resistance. The tin layer prevents interaction between the metal and food, preserving the quality of the contents.
- Cans for Vegetables, Fruits, Soups, and Beverages:
- Requirements: Food-grade tinplate must have a uniform coating of tin to prevent contamination and oxidation. The material should be easy to shape for can production, and must resist internal corrosion caused by acidic or salty foods.
- Additional Coating: For products with acidic content (e.g., tomato sauces), an additional organic lacquer is applied to the tinplate to protect both the metal and the food.
- Aerosol Containers for Food Sprays and Creams:
- Requirements: These containers must withstand internal pressure, maintain structural integrity during storage, and prevent rusting. The tinplate must also have a smooth surface to allow for labeling and printing.
2. Beverage Packaging
Tinplate is widely used for beverage cans, particularly for beer and carbonated soft drinks. It offers a strong and non-reactive surface that preserves the flavor and quality of beverages.
- Requirements:
- Tinplate for beverage packaging must have high formability for can shaping. It should also have a protective internal coating to prevent the contents from reacting with the metal.
- Additionally, cans must maintain pressure resistance and withstand external impacts during transport.
3. Aerosol Packaging
Tinplate is an ideal material for producing aerosol containers for products such as deodorants, air fresheners, and household cleaners.
- Requirements:
- Aerosol containers require high mechanical strength to withstand internal pressure. The tinplate used must also resist corrosion from potentially harsh chemical contents.
- Coating adherence is crucial for labeling, and the surface should be smooth for printing and decoration.
4. EQUIPMENT & PRODUCTION LINES
Offers coils and sheets, coil packed in a vertical form or a horizontal.
A label that indicates the manufacturing history is affixed to the outside of the packaging. In addition, a service card is contained inside.
With regard to types of packing and markings, please consult us.