1. Plastic Cap Feeding

• Plastic caps are loaded into a hopper or vibratory bowl feeder.
• The feeder automatically separates and orients the caps in the correct direction.
• Oriented caps are transferred through a linear track to the assembly station.
• Sensors monitor cap availability and detect any jams or incorrect orientation.

2. Rubber Stopper Feeding

• Rubber stoppers are loaded into a separate hopper equipped with a vibratory bowl feeder.
• The feeding system singulates and correctly orients each stopper.
• Any overlapping or improperly oriented stoppers are automatically rejected or recirculated.
• Correctly oriented stoppers are delivered to the insertion station.

3. Cap and Rubber Presence Detection

• Photoelectric or proximity sensors verify:
  • Plastic cap presence
  • Rubber stopper presence
  • Correct orientation of both components


• If either component is missing or misaligned, the assembly cycle is skipped and an alarm is generated.

4. Automatic Rubber Insertion

• A servo-controlled or pneumatic pick-and-place mechanism positions the rubber stopper directly above the plastic cap.
• The stopper is pressed into the cap using a controlled insertion force.
• The insertion depth and pressure are precisely controlled to prevent damage to either component while ensuring a secure fit.

5. Assembly Verification

• Integrated sensors or an optional vision inspection system verify:
  • Presence of the rubber stopper inside the cap
  • Correct seating depth
  • Proper alignment
  • Complete assembly


• Any defective assemblies are automatically rejected.

6. Finished Cap Discharge

• Successfully assembled cap-rubber components are transferred to the outlet conveyor or collection hopper.
• The assembled caps are then supplied automatically to the Blood Collection Tube Capping Machine for final tube sealing.