Coating speed

Coating speeds in excess of 305 m /min can be attained. The latex coating can be dried in forced-air or radiant-heat ovens (186,187). Multiple coats... 

Porous inkjet papers are in general created from colloidal dispersions. The eventual random packing of the colloid particles in the coated and dried film creates an open porous structure. It is this open structure that gives photographic-quality inkjet paper its apparently dr/ quality as it comes off the printer. Both the pore structure and pore wettability control the liquid invasion of the coated layer and therefore the final destination of dyes. Dispersion and stability of the colloidal system may require dispersant chemistries specific to the particle and solution composition. In many colloidal systems particle-particle interactions lead to flocculation which in turn leads to an increase in viscosity of the system. The viscosity directly influences the coating process, through the inverse relation between viscosity and maximum coating speed. 

Coating Method Coating Viscosity, Pa.s Coating Speed, m/min (ft/min) Coating Thickness, pm... 

Coaling method coating speed (m min 1) Viscosity range, (m Pa s) Wct-coating thickness range (r m)... 

Figure 3.7 Effects of coating speed and slip pH on coating thickness of membrane layer [Teipstra and Elferink, 1991]...

To gain productivity, higher line speeds are practiced. Silicone suppliers have to deliver silicone systems which cure faster while providing the same high coverage standards and process properties. The consequence of higher coating speeds is the formation of mist. 

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