纸张涂料
Improving Abrasion Resistance
How do I improve abrasion resistance?
Micronized wax-based additives and polyether modified di-methyl polysiloxane surface additives added to your coating formulation will improve coated papers' resistance to physical damage.
Resistance to Burnishing
I want to improve my surface to have good resistance to burnishing.
Specialized micronized wax based additives added to your coating can prevent low gloss surfaces from burnishing or increasing in gloss from rubbing. The combination of good printability and to avoid glossmottling can be practised in using a low amount of wax-based performance additives.
Curling
What makes paper curl and how can it be prevented?
The non-uniform uptake of water or atmospheric moisture on two sides causes the side with greater moisture content to expand; thus curling towards the drier side. Curling is common for papers that are only coated on one side.
Curling can be corrected by equalizing the uptake of atmospheric moisture of both sides.
For single side coated paper, increasing coating hydrophilicity can minimize or prevent curling.
Dot Gain
How do I reduce dot gain?
Dot gain is the increase of the applied ink drop's diameter; spreading. Reducing paper surface porosity and increasing ink viscosity will reduce ink dot gain. Increasing paper coating hydrophobicity if ink is water-borne will also reduce ink dot gain. In this cases we use different wax-based performances additives regarding the color recipe.
Adhesion
How can I improve adhesion?
Adhesion is a highly complex issue that can be addressed in various ways.
Surface tension has two components, polar and disperse component combined. Wetting will occur when liquid being applied is lower in surface tension than the substrate's surface tension. However, wetting does not guarantee adhesion. It is the proper matching of the polar/disperse components of substrate and coating that in turn controls adhesion. Typically, increasing the polar component leads to improve adhesion. Adhesion can be corrected by using adhesion promoters, and polar surfactants.
Adhesion is the sum of all adhesive forces; Van de Val, atomic, charge, physical, etc.
Since wetting and penetration are events that occur simultaneously when liquids are applied onto porous substrates such as paper, controlling or modifying surface porosity, polarity, roughness, and penetration will effect both wetting and adhesion.
Increase of Water Resistance
How do I increase water resistance?
Increasing surface hydrophobicity will increase resistance to water uptake and penetration. We use different hydrophobic products to increase water resistance, also to avoid fiber swelling for paper stability. This is used in technical paper, baking paper and packaging paper.
Defoamer Selection
How do I select the right defoamer?
The mechanism of defoaming requires destabilization of the lamella, or the foam bubble wall.
Defoamers are incompatible with the system, exhibit positive entering and spreading coefficients.
This incompatibility must be carefully controlled because too much incompatibility, while exhibiting good defoaming, will introduce other defects into the system. These defects will range from specks and seeds to cratering of subsequent coatings.







