Tube Loading and Detection

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Empty blood collection tubes are loaded into the tube loader hopper, where the automatic feeding system organizes and transfers them into tube racks. The system ensures a continuous and controlled supply of tubes to the production line.
The tubes are automatically positioned in the racks and transported to the next processing station. This automated handling reduces manual intervention and supports smooth production flow.
An integrated detection system checks for missing tubes, reverse loading, and improper positioning. Any loading irregularities are identified to help maintain production efficiency and prevent processing errors.

Tube Cleaning : –  

The blood collection tubes pass through a dedicated cleaning station before chemical treatment. Filtered hot air is directed into each tube to remove dust, loose particles, and other unwanted contaminants from the internal surface.
The cleaning process prepares the tubes for uniform additive application. Proper cleaning helps reduce the risk of contamination that could affect the quality of the blood collection tubes.
The automated cleaning station processes tubes consistently as they move through the production line. This supports reliable downstream dosing, drying, and vacuum-sealing operations.

Chemical Dosing / Additive Spraying :-

After cleaning, the tubes move to the chemical dosing station, where the required additives are applied to their internal surfaces. Depending on the tube type, these additives may include EDTA, K2-EDTA, K3-EDTA, Heparin, or Clot Activator.
Precision ceramic pumps and pinch valve technology control the additive spraying process. The system is designed to provide consistent dosing and uniform distribution according to the selected production recipe.
A sample spray station allows operators to verify the additive quantity before full-scale production begins. This helps establish the required dosing parameters and supports consistent product quality throughout the manufacturing process.

Chemical Drying  :- 

After additive spraying, the tubes enter a multi-stage drying system designed to remove moisture from the applied coating. Proper drying is essential for maintaining the intended condition of the additive inside each blood collection tube.
PTC heaters provide controlled heating, while high-pressure air circulation helps distribute heat and airflow throughout the drying chamber. This combination supports consistent drying across the tubes being processed.
The drying system is configured according to the selected additive and production requirements. Appropriate process settings help achieve a uniform coating condition before the tubes proceed to subsequent manufacturing stages.

Sodium Citrate Dosing (Optional) : –

For coagulation blood collection tubes, sodium citrate solution is dispensed through an optional precision dosing station. This process applies the specified quantity of anticoagulant solution to each tube according to the selected production parameters.

A precision piston pump filling system controls the dosing operation. The system is designed to deliver repeatable quantities and maintain consistency throughout the production run.
Accurate sodium citrate dosing is important for supporting the intended performance of coagulation tubes. The station can be incorporated into the production line when manufacturing tube types that require this specific additive.

Cap and Rubber Combination : –

Plastic caps and rubber stoppers are supplied to the automatic cap combination machine. The machine positions and assembles the two components to create cap assemblies for the blood collection tubes.
The automated assembly process helps maintain consistent component positioning and reduces the need for manual handling. Proper assembly supports the subsequent cap placement and vacuum-sealing operations.

Once assembled, the cap and rubber stopper combinations are transferred to the capping system. This ensures that the components are available in a continuous and organized manner for the next stage of production.

Cap Placement : –

The cap adding unit automatically picks up the assembled cap components using a vacuum pickup mechanism. The system transfers the caps from the feeding area to the corresponding blood collection tubes.
The caps are positioned over the tubes in the rack according to the configured arrangement. Simultaneous placement helps improve production speed and maintain consistency across multiple tubes.
The placement mechanism is designed to ensure that caps are correctly positioned before vacuum generation and pressing. This helps reduce placement errors and supports reliable downstream sealing operations.

Vacuum Generation and Cap Pressing: –

After cap placement, the tube rack enters the vacuum chamber, where the required vacuum level is generated inside the blood collection tubes. The vacuum parameters are configured according to the specific tube requirements.

Once the target conditions are established, the caps are pressed onto the tubes to create a secure closure. The system maintains the preset vacuum conditions during the sealing cycle to support consistent results.
A PLC-controlled system manages the vacuum settings and operating sequence. This automated control helps maintain process repeatability and supports the production of tubes with the required vacuum characteristics.

De-Nesting : –

Following vacuum sealing, the tubes are automatically removed from their production racks through the de-nesting station. The mechanism separates the individual tubes carefully and prepares them for the next processing stage.

The automated transfer system arranges the tubes for inspection and labeling. Controlled handling helps reduce unnecessary manual contact and supports a continuous production workflow.
Once separated, the tubes are conveyed to the downstream inspection section. This stage provides a smooth transition from tube processing and sealing to quality verification and product identification.

Vision Inspection – Additive verification: –

The tubes pass through an automated vision inspection station designed to verify the presence and visible distribution of the applied additive coating. The inspection system evaluates each tube according to the configured inspection criteria.

The system identifies tubes with missing, insufficient, or uneven additive application where these conditions can be detected by the inspection method. Tubes that fail the defined criteria are marked for rejection.
Automated inspection helps reduce dependence on manual visual checks and supports consistent quality control. The inspection capability depends on the additive’s visibility and the validated performance of the vision system.

Labeling And Printing : –

After passing the required inspection stages, approved tubes are transferred to the automatic labeling station. The labeling system applies product labels in the specified position to support identification and traceability.
The printing system can include essential information such as batch number, manufacturing date, expiry date, barcode, and other required product details. Printing parameters are configured according to the product specification and labeling requirements.
Automated labeling helps maintain consistent label placement and improves production efficiency. Accurate product identification supports subsequent inspection, packaging, storage, and distribution activities.

Vision Inspection – Label Verification : –

After labeling, each tube passes through a camera-based inspection station. The system examines the applied label to verify its position, orientation, and overall appearance against the configured acceptance criteria.

The inspection system also checks readable printed information, including batch details and barcode quality, where supported by the installed verification technology. This helps identify printing errors and labeling defects before packaging.

Tubes that fail the label verification criteria are flagged for rejection or further handling according to the configured system logic. This stage supports accurate product identification and helps maintain consistent labeling quality.

Automatic Rejection : –

The automatic rejection station removes tubes identified as defective during the inspection stages. Rejection criteria may include improper additive application, defective labeling, damaged caps, broken tubes, and other detected quality issues.

The system receives inspection signals and separates rejected tubes from accepted products. This automated process helps prevent identified defective units from continuing into the final packaging stage.
Rejected tubes can be collected separately for inspection and appropriate disposition according to established quality procedures. The rejection mechanism helps improve production control and supports consistent finished-product quality.

Robotic Tray Loading : –

Accepted blood collection tubes are transferred to the robotic tray-loading station. An automated pick-and-place system picks up the tubes and positions them in thermocol or plastic trays according to the required loading pattern.
The robot follows a predefined arrangement to maintain organized spacing and consistent tray utilization. Automated loading reduces repetitive manual handling and helps improve packaging-line efficiency.
The loading configuration can be adjusted according to the tube dimensions, tray design, and required quantity per tray. Once the trays are filled, they are transferred to the shrink-packaging section for further processing.

L-sealing And Shrink Packaging: – 

The loaded trays enter the L-sealing machine, where shrink film is positioned around the tray and sealed to create the required package format. The sealing operation forms a closed film wrap around the loaded products.

After sealing, the trays pass through a shrink tunnel. Controlled heat causes the film to contract around the tray, producing a tight and organized package.
The packaging parameters are configured according to the film material and tray requirements. Shrink packaging helps protect the trays during handling and storage; however, it should not be considered sterile-barrier packaging unless specifically validated for that purpose.

Finished Product Collection: –

After shrink packaging, the finished blood collection tube trays are collected at the discharge section of the production line. The packaged trays are checked for visible packaging defects and overall presentation before further handling.

The accepted trays proceed to final inspection and carton packing according to the required packaging configuration. Appropriate identification and documentation help maintain batch traceability throughout the finished-product handling process.

Finally, the packed cartons are transferred to the designated storage area before dispatch. Proper storage, handling, and inventory management help ensure that finished products are organized and ready for distribution according to established quality procedures.