**Standard Requirements for Bearing Inner Packaging and Analysis of All Data**
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Source: China Bearing Network | Time: March 18, 2014
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Proper packaging plays a crucial role in maintaining the quality, precision, and usability of bearings during transportation and storage. Bearings must be carefully packaged to protect them from moisture, dust, impact, and rust. This guide outlines the standard requirements for inner packaging and provides detailed instructions on how to ensure the integrity of bearings before they reach the end user.
Bearing packaging is typically divided into three main categories based on the anti-rust period:
1. **Short Anti-Rust Period Packaging (3–6 months)**
Suitable for large-volume deliveries to the same customer who will use the bearings shortly after receiving them. This type of packaging is simple and cost-effective, ideal for short-term use.
2. **Medium Anti-Rust Period Packaging (1 year)**
Designed for general use where the bearings are expected to be used within a year. This packaging offers moderate protection against corrosion and environmental damage.
3. **Long Anti-Rust Period Packaging (2 years)**
Used for special or high-precision bearings that may not be used immediately. This method ensures long-term protection and is commonly applied in industrial settings.
The materials used for inner packaging include polyethylene plastic tubes or boxes, kraft paper, plain and crepe polyethylene composite paper, corrugated cartons, polyethylene or polypropylene films, nylon or plastic fastening tapes, waterproof and high-strength plastic tapes, and linen bags. These materials are selected based on their ability to provide effective rust prevention and environmental protection.
**Packaging Guidelines by Bearing Size:**
- **Miniature Bearings (less than 10mm diameter):**
Pack 10–15 sets in a plastic cylinder, then place 5–10 cylinders into a single carton or bag.
- **Medium and Small Bearings (up to 100mm diameter):**
Wrap multiple sets in polyethylene film, then enclose them in kraft paper or polyethylene composite paper. Place each set in a plastic tube or individual polyethylene bag. Seal the bag and place it in a carton.
- **Large Bearings (over 100mm diameter):**
Wrap in polyethylene film or composite paper, then place in a carton with a plastic film bag. For extra protection, use a three-layer packaging system: inner layer with polyethylene tape or composite paper, middle layer with fastening tape, and outer layer with waterproof plastic tape.
- **Extra Large Bearings (over 200mm diameter):**
Use a three-layer package as above, and add an additional outer layer wrapped in linen tape. This ensures maximum protection for oversized bearings.
For separable tapered roller bearings with an outer diameter ≥150mm, it's recommended to pad the inner and outer components with polyethylene film before packaging. Alternatively, separate the components and pack them individually. For exchangeable cylindrical roller bearings with similar dimensions, the packaging can be simplified, as the components can often be separated during installation.
**Outer Packaging Recommendations:**
- Double-walled corrugated cardboard boxes, with a total weight of no more than 25kg per box. The exterior should be wrapped with plastic film and secured with strapping.
- Wooden crates (nail boxes) are suitable for heavier shipments, with a maximum weight of 30kg per box. These are secured with steel straps.
- Plastic corrugated boxes are also an option, with a weight limit of 25kg per box and plastic strapping around the exterior.
When placing inner-packaged bearings into outer boxes, always line the inside with a plastic bag or film. If there is empty space, fill it with dry materials such as corrugated paper or scrap paper to prevent movement and damage.
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This article was originally published on China Bearing Network. Please cite the source when sharing.
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