Tinplate bottom ends

● Tinplate bottom ends The bottom ends of food and beverage cans is a key component used to seal the bottom of metal cans and is widely applied in canned food, beverages, dairy products, condiments and other products.

Specification

Material	Tinplate
Outer Diameter(mm)	Φ59 φ73 φ83 φ93 φ109 φ163
Iron Hardness	T4CA/T4BA Customized
Type	200# 209# 300# 307# 401# 603#
Thickness(mm)	0.17-0.24mm Customized
Printing	Gold lacquer, Clear lacquer, White coat etc. Customized
Packing	Paper bag then into Pallet or Carton
Acceptable	OEM, ODM, OBM

Product Details

Our can bottom ends can be used to hold various contents, including canned meat, canned tomato sauce, canned fish, canned fruits and dry food, etc., through different inner coating treatments. Customized printing can be done on the outside, and your logo and brand can be printed on it.We offer a full range of products in various specifications to meet most metal packaging needs, and we can also provide custom sizes! Our products are made from the highest quality materials and with exquisite craftsmanship to ensure that your logo and brand are presented in the best possible light.

Basic Functions and Structure

√ Material: Made of tin-plated thin steel plate (SPTE, also known as tinplate), which is formed by stamping. The surface is tin-coated to prevent corrosion.
√ Structure:The appearance is circular. There is usually a depression or protrusion in the center (referred to as "bottom reinforcement"), which enhances the compressive strength;
The edge design is a rolled edge, and it is connected to the can body through a double seam (Double Seam);The inner side is coated with food-grade epoxy resin coating to prevent the contents from corroding the can.
√ Usage: To seal the bottom of the can, to withstand the internal pressure (such as the vapor pressure generated after sterilization), to ensure sealing and safety.

Production Precautions

Project	Notes
Material selection	Use food-grade tin-coated sheets that comply with GB 4806.9 or FDA standards. The tin coating should be ≥ 2.8g/m².
Anti-rust treatment	The tin coating has some anti-corrosion effect, but it may still rust in a high-humidity environment. During storage, keep it dry (humidity < 60%).
Avoid mechanical damage	The edge of the bottom cover is sharp. During handling, prevent scratches to avoid affecting the sealing quality of the can.
Prohibition of reuse	Food cans are one-time packaging. It is strictly prohibited to recycle old bottom covers for refilling.
Compatibility verification	The contents (such as acidic fruit juice, tomato sauce, meat broth) must be chemically compatible with the inner coating to prevent leaching or corrosion.

Common Defects and Detection Methods

Defect Type	Manifestation	Detection Method
Rust	Red-brown spots and pockmarks on the surface	Visual inspection, salt spray test
Scratches/Wear marks	Linear scratches on the surface	Magnifying glass observation
Cracks	Micro cracks at the edges or rounded corners	Ultrasonic testing

Storage and Transportation Recommendations

√ Storage Conditions: Cool, dry, well-ventilated, with relative humidity ≤ 60%, and avoid direct sunlight;
√ Stacking Method: Use pallets for stacking, with a height not exceeding 1.5 meters to prevent deformation;
√ Transport Protection: Shockproof, moisture-proof, and avoid mixing with corrosive substances.

Safety Warning

√ It is strictly prohibited to modify or reuse privately;
√ Before use, check for rust, dents or leaks;
√ When disposing of it, completely empty the contents to avoid contaminating the environment.
√ If used for special foods (such as infant food, medicines), it must also comply with more stringent standards such as YBB or ISO 22000.