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Spray Verifier

direct optical verification of internal spray on beverage cans

Mis-spray detection system

Spray Verifier online

Detects coating errors that gun monitoring systems cannot see

PLEASE NOTE This sensor works with straight walled, DWI beverage cans, and with lacquers that are white/opaque when wet. It will not work with lacquers that are transparent when wet, eg. BPA-free.

The SC7100 can act as a direct replacement for the older SC7000+ Mis-spray Detector with similar detection capabilities.

When the system detects a coating error, it immediately prevents any bad cans from mixing with good ones, either by stopping the offending spray machine (LATCHED MODE) or by rejecting the bad can from the line (PULSED MODE), depending on how the system is configured.

helps to maintain maximum process efficiency



The SC7100 reliably detects

  • Bright cans
  • Significant areas with no coating

Greater capability can also be achieved see below

NOTE : This sensor works with lacquers that are white/opaque when wet. It will not work with lacquers that are transparent when wet, eg. BPA-free.

  • benefits
  • Bad cans are stopped at the spray machine, reducing spoilage
  • No sorting or line shut-downs—helps to increase process efficiency
  • Self calibrating, self learning, adjustment free
  • Multiple side wall inspection zones, plus dome inspection
  • Inspects wet lacquer immediately after the LSM
  • Improved product quality and customer satisfaction
  • Compact and self-contained
  • Minimal maintenance—just a wipe clean each shift
  • User replaceable inspection window
  • Advanced multi-zone capability - depending on environemntal conditions

installation

This unit is designed to be fitted to either a modified spray machine discharge trackwork or a discharge conveyor. The sensor can be installed to run in one of two formats:

  • LATCHED—outputs latch to stop the spray machine and drive the optional can stop to trap the defective can.
  • PULSED—all outputs are given a short pulse to facilitate can rejection using an air blast mechanism.

self calibrating, adjustment free

The detector constantly updates a stored value that represents the ‘good can’. It continually self-calibrates and compensates for the inevitable accumulation of lacquer on the detector window. The system is therefore adjustment-free, although the detector window must be wiped clean at the start of each shift.

operation

The SC7100 measures the brightness of each can in distinct zones. Some of these zones are used to assess the top wall coverage, others are used to assess the dome and overall can coverage. These values form a distinct signature for each can. Since more light is dispersed by the white surface than by exposed metal, any significant area of the can that is not lacquered is detected as a relative increase in light levels. The operator display indicates whether a defect is from the dome and lower side wall or from the upper side wall of the can..

advanced capability

Spray Verifier can also deliver a wider range of detection capabilities depending on local environmental conditions, including:

  • coating type
  • ambient temperature
  • repeatability of can presentation to the sensor

By directly inspecting multiple zones inside the can immediately after each spray machine, Spray Verifier can detect the widest range of coating defects associated with mis-sprays, many of which cannot be detected by gun monitoring systems:

  • mis-spinner / non-spinner
  • spluttering gun—this sometimes happens on first can after an idle period
  • incorrect fan pattern—caused by partially blocked, dried or worn nozzle
  • short spray or partial spray
  • total gun failure—often due to guard or e-stop operation or sensing error
  • incorrect gun positioning—may be a result of LSM maintenance
  • contamination or de-wetting—washer problems or surface contamination can cause a coating to de-wet. Oil, grease or other contaminants prevent the coating from adhering to the can’s surface