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Calcite
in Paper Applications :
Wolkem’s calcite (GCC) milled grades are used
as fillers in Paper making in Alkaline / Neutral
media and as filler in wet end, writing and printing
paper, as it provides
- Higher brightness
- Better optical properties
- Lesser optical brightening agent(OBA) demand
- Improved surface properties like matt finish
and smoothness
- Provides longevity
- Enhances printability
- Helps achieve higher filler loading
- Lowers OBA demand
- Lowers electrolytic load
- Reduces cost
- Provides better run ability of the paper
machine
- Reduces consumption of sizing chemicals
- Allows AKD sizing
- Non-hazardous
- Avoids use of alum in the process
- Permits higher ash content as paper can
be made in
- Alkaline medium as against acid medium
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Wolkem’s
Wet Ground Calcium Carbonate (WGCC) grades are
used as Coating pigments in Pre Coat and or Top
coat of Boards, in Mat, Dull, LWC & ULWC coated
papers, as it provides
- Higher brightness
- Good print quality and print gloss
- Lower dispersant demand
- Lower binder demand
- Lower production cost
- Lower viscosity of coating color at high
shear
- Easy disperseability
- higher solids content of coating slip
- Consistency and better quality control during
paper coating
- No make down cost from dry to wet, as it
is supplied in ready to use slurry form
- Provides dust free and safe working environment,
due to its slurry form
- Low inventory due to proximity to supplier
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Talc in Paper Applications :
Wolkem’s Talc Milled Grades are used as a filler
and coating pigment in rotogravure & offset
printing process, in colored papers, labels catalogues,
LWC and HWC paper/ Board
Wolkem’s Talc as a filler provides
- Decreased porosity
- Improved opacity
- Reduces cost
- The print benefits also allow the increased
usage of calcium carbonate in coating formulations
in paper mills operating under alkaline conditions.
- Accelerates water drainage in the paper
machine wet-end and impart good cross-sectional
strength to paper.
- Talc's softness imparts good folding properties
to paper board, making the sheet less abrasive
on cutters and other converting equipment.
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Wolkem’s
Talc as a coating pigment provides
- Improved gloss
- provides smoothness to surface
- Imparts print opacity
- reduces wear and tear of machineries
- Reduces use of expensive OBA.
- Provides a silky feel for matt paper, thereby
enhancing reader comfort and touch
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Further
talc
- Provides elimination of core burst problem
of LWC-Rotogravure printing.
- Better printability for gravure printed
papers.
- Silk feel for wood-free matt / Semi matt
papers.
- Water based barrier coating for grease resistance
- Recycle ability
- Low friction properties
- Decreased premature breakage of the ink
capsules in NCR (no carbon required paper)
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Kaolin
in Paper Applications :
Wolkem’s kaolin is used as a coating pigment in
Duplex Board and Paper as it provides
- A smooth and even surface
- Imparts gloss
- Improves printability
- Its rheological properties allow it to easily
disperse in water
- To produce slurry with low viscosity at
high solid contents.
- Reduces paper cost by occupying the interstices
between cellulose fibers.
- This makes typographically smooth, bright
and possessing good ink receptive qualities.
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