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BARRISURF™ - A new concept for water based barrier coatings
The concept of water based barrier coatings is straightforward – they keep contents in, the external atmosphere out, and help maintain the strength of paper and board packaging by preventing moisture / grease absorbtion.
What is a Water Based Barrier Coating?
Water based barrier coatings are water-based dispersions of film-forming polymer(s), additives and pigments.
The advantages of using pigment-filled water-based barrier coatings compared with unfilled coatings are improvements in barrier properties, optical properties, runnability, blocking resistance, and cost effectiveness.
Water-based barrier coatings give useful properties when applied to paper and paperboard. These properties and end uses that can benefit from them
Moisture resistance (water or vapour);
corrugated cases, multi-wall sacks, folding cartons, liquid containers
Oil and grease resistant;
corrugated cases, bags, folding cartons, fast food applications
food packaging, (gas barrier ie Oxygen, Nitrogen, Carbon dioxide, or microorganism barrier)
Barrisurf – Features and Benefits
Imerys has developed new barrier kaolins as part of the BARRISURF™ product line. These hyper-platy, nano-dimensional thickness crystals create a tortuous coating structure that inherently resists penetration.
With the rising cost of polymers, incorporating Imerys BARRISURF™ kaolins in a formulation is a cost effective route to deliver superior barrier performance.
Electron Micrograph image of BARRISURF™ hyper-platy kaolin
|As the platy particles of BARRISURF™ align during the drying of the Water based barrier coating, they form a tortuous path, giving up to 3x improvement in barrier to moisture, oil and grease and oxygen.|
|Potential raw material cost reduction||Using BARRISURF™ to replace more expensive resin in a water based barrier coating formulation can give a significant cost reduction, whilst also improving the physical properties of the coating.|
|Recyclability||By improving the performance of water-based barrier
coatings, BARRISURF™ allow water-based barrier coatings to replace other barrier technologies such as polymer extrusion, waxes and fluorocarbons.
The use of polymer extrusion and wax technologies prevents the re-pulping of the waste paper or board product. Paper and board treated with a water-based barrier coating can be re-pulped and is therefore recyclable.
The use of fluorocarbons has environmental concerns.
The cost of disposal to landfill can be transformed into income from the sale of recyclable paper and board, giving Barrisurf sustainable credentials.
The increased focus on recycling and sustainable packaging is driving the trend for water-based barrier coatings to replace fluorocarbon and extruded polymer barrier coatings. Platy kaolins incorporated with appropriate polymers can provide effective barrier performance against water, gases and grease. The use of these platy kaolins improve the barrier performance above and beyond typical latex coatings.
For more technical information, discussion of this novel concept and sample requests contact us