Unit for dosing and mixing two component adhesive

Unit for dosing and mixing two component adhesive

Case

A customer develops adhesive consisting of multiple components that are mixed during the labelling process.
This adhesive is composed of a watery component mixed with an additive that ultimately determines the bonding properties of the glue.
These fluids must be dosed and mixed with the greatest of precision. The process therefore requires both automation and fine control. Given the positive experience with a previous machine from Suurmond, this customer asked the company to develop a dosing and mixing module specifically for their new adhesive.
 

Arrangement

The final design employs two dosing pumps that deliver the two components into the mixing process pipework.
The flow rate is measured and monitored by two independent flow meters. A static mixer is mounted in the same pipe to combine the two components to form a homogeneous fluid. 
Reijer van den Bosch, Project Engineer: “The customer also asked that we include a third flow meter to measure the final product in the pipe. This creates an extra monitoring step in the process, enabling detection of any leaks, as well as a check for possible failure of one of the two upstream component flow meters. The mixture, a highly concentrated ‘glue’, is then pumped through the delivery line to where it is used to bond the labels to the actual product container.
 

Membrane pumps

In addition to the dosing pumps and flow meters, Suurmond also supplied all the pipework, as well as two membrane pumps. One diaphragm pump is used to fill a buffer vessel with additive. This buffer vessel takes over when the main additive supply tank is empty, enabling the exchange of supply tanks without interrupting the process. The second diaphragm pump is intended to flush the pipe system when the machine is idle.
 

Gather dosing pump for additive

Density: approximately 1 kg/L
Viscosity: 100-300 mPa
Suction pressure: 1 bar(a)
Differential pressure: 11 bar(a)
Flow rate: 6-217 ml/min
Speed: appr. 30-1000 rpmGather dosing pump and HNP-M inline filter are mounted with tri-clamps
 

Gather dosing pump for water

Density: 1 kg/l
Viscosity: 1 mPa
Suction pressure 1 bar(a)
Differential pressure: 9 bar(a)
Flow: 14-217 ml/min
Speed: appr. 1750-2400 rpmOrbital welding for suurDOS tubing for smooth inner and outer surface
 

Additional custom requirements for the skid:

Gather dosing pump and HNP-M inline filter are mounted with tri-clamps
Orbital welding for smooth inner and outer surface of the tubing
 

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