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NBR rubber ring
Typical production process of nitrile rubber rings:
1. Raw Material Preparation
- Nitrile rubber compound mixing
- Adding necessary additives:
* Vulcanizing agents
* Accelerators
* Antioxidants
* Plasticizers
* Fillers
2. Compound Mixing Process
- Initial mastication of raw rubber
- Addition of carbon black/fillers
- Incorporation of chemical additives
- Final mixing to achieve uniform compound
- Quality testing of compound
3. Forming Methods
A. Compression Molding
- Placing rubber compound in heated mold cavity
- Applying pressure and heat
- Curing at specific temperature/time
- Cooling and removing from mold
B. Injection Molding
- Heating rubber compound
- Injecting into closed mold
- Curing under pressure
- Automated removal from mold
C. Transfer Molding
- Preforming rubber compound
- Transferring into heated mold cavity
- Curing under pressure
- Part removal
4. Post-Curing Process
- Secondary vulcanization
- Temperature controlled environment
- Improves physical properties
- Reduces volatile compounds
5. Finishing Operations
- Deflashing (removing excess material)
- Deburring
- Surface cleaning
- Size verification
- Visual inspection
6. Quality Control Steps
- Dimensional verification
- Hardness testing
- Compression set testing
- Visual inspection for defects
- Batch testing for:
* Tensile strength
* Elongation
* Chemical resistance
7. Packaging & Storage
- Clean room packaging if required
- Proper storage conditions
- Protection from:
* UV light
* Ozone
* Extreme temperatures
* Humidity