Bulk Inspection

SPECTRA HR - Bulk Inspection

The inspection of bulk products on slat counters, tablet counters, drum fillers and vibratory feeders is used to detect foreign products, fragments and foreign particles and their ejection. Colour detection is required for this application and in the majority of applications the SPECTRA HR high-resolution inspection is suitable.

Inspection criteria and objects

Inspection objects:

  • Tablets
  • Oblongs
  • Dragees
  • Hard and soft gelatine capsules

Examination criteria:

  • Colour
  • Size
  • Fragments
  • Circumference
  • Shape

Advantages of the bulk application

The bulk application is carried out with a high-speed inspection of up to 700,000 products per hour and performs detailed defect detection with a multi-camera solution. The high-resolution SPECTRA blister inspection can be used on all common tablet counting machines (slat counters) and on all common counting machines (ETC) with vibration feed. The use on large machine widths can be inspected.

Up to 48 vibration channels can be inspected. With this application, detection of foreign products, fragments and foreign bodies can be accomplished.  In addition, this solution offers position-accurate evaluation for individual ejections.

Software facts of the SPECTRA bulkware

The application of quality control of bulk products requires from image processing the ability to develop the necessary algorithms for separating the products in addition to the appropriate image resolutions and evaluation speeds. It is also visualised on the user interface. The separation must work at high speed so that the classic inspection algorithms of product inspection can be used to identify colour, circumference and shape.


Evaluation on a vibratory feeder

The separation of the randomly arranged products is done by the software. This is followed by the product inspection.


Machine-specific evaluation on a tablet counting machine (slat counter)

The high products are inspected and the signals are processed further. The screenshot shows the submixing with smaller objects.


Evaluation on a high-speed inspection machine

The products are lined up with plastic rods and presented to the camera. Separation of the products is not necessary.

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Other possible applications

Bulk inspection can be used on different types of machines:

Vibratory feeder

Bulk inspection can be installed on all common models of tablet counting machines with vibratory feeders. The combination of several cameras enables the monitoring of large machine widths and thus provides the necessary resolution.


Drum filling 

SPECTRA can also be used on drum fillers without any problems. Here, the system gives position-accurate results for each individual product, making it possible to reject defective products individually.

Double bulk inspection - detection of the smallest colour differences

The hardware was customised for the synchronous inspection of bulk goods on two identical, parallel softpack tablet counting machines that are operated via a common terminal. 

The dimensions and weight of the superstructure are handled by mounting a bracket including a lift, which is equipped with gas springs and moves the DOM boxes by means of compressed air.

Further application levels of SPECTRA HR