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Plasma Treatment
 
GENERAL's plasma pre-treatment system acts to enhance adhesion and/or barrier against oxygen and water vapour transmission for improved packaging performance and extended shelf-life
 
The surface of the web is prepared in-line with the coating process. The plasma is formed when a gas, or combination of gases, are injected into an isolated treatment zone and ionised under vacuum conditions.
 

 
Plasma interacts with the surface of the web in a variety of ways. In addition to removing moisture and other contaminants, it also acts to increase the number of nucleation sites through the introduction of polar groups, resulting in a coating with a homogenous surface morphology and less defects.

With over 30 plasma installations throughout the world and years of development , GVE is the world leader in surface activation of polymeric materials, using plasma pre-treatment.
 
Intense Treatment
The plasma is magnetically enhanced allowing intense treatment at high line speed. Treatment is further intensified by the use of medium frequency AC electrodes, which help increase plasma activation on the surface of the web and help to minimise cleaning. General’s unique plasma focusing greatly reduces the power requirement for a given application.
 
Precise Web Control
The risk of web breaks is minimised through the use of entry rollers and machined low conductance slots.
 
Low Cost of Ownership
The environment within the web treatment zone is isolated with the help of low conductance seals. Plasma leakage is minimised, protecting the interior of the vacuum vessel and reducing gas consumption. Higher process pressures substantially increase the life of the electrodes.
 
Consistent Results
A closed-loop control system maintains stable conditions within the web treatment zone by automatically regulating the gas injection rate and ratio, enabling consistent full width treatment throughout the cycle.
 
Low Maintenance
The efficient use of input power by plasma focusing maximises improvement of the process and at the same time reduces cleaning. Removable front covers enable quick and easy cleaning.

 

Benefits of plasma pre-treatment

Effect on oxygen barrier - 20 micron BOPP film



 
Effect on surface morphology

Without plasma
pre-treatment
With plasma
pre-treatment


 
  More information for Plasma pre-treatment -  PDF   125 Ko
 

 
 
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