Sites:
Home > Technical Library > Manufacturing and Process Equipment > Materials Processing Equipment > Preparation of Paper Coatings

Preparation of Paper Coatings

From Silverson Machines, Inc.

Paper coatings impart a variety of properties, both decorative (whiteness, opacity etc.) and functional (smoothness, absorption rate etc.) A typical coating has two principal constituents: a dispersion of pigments in water and an adhesive or binder. Traditionally coatings were based on clays such as china clay (kaolin) and bentonite, however, in modern paper coatings calcium carbonate is more common. Other materials are also used to obtain certain properties. These include:

* Talc - for smoothness
* Silica - for applications requiring good water absorption rate - e.g. ink jet paper
* Titanium dioxide - for whiteness and opacity
* Resins - control of ink absorption rate

The clay or other pigment is normally supplied as a in bulk tankers as a slurry containing 60% solids. Some paper manufacturers prepare the slurry themselves, dispersing the powder into water with conventional agitation. This is a relatively simple duty, however long mixing times may be required to produce each batch.

Read the Whole Article
Products & Services
Powder and Solids Blenders
Powder and solids blenders produce a uniform mixture of dry or powdery materials. They are designed for industrial and laboratory environments, and provide either batch or continuous blending.
Rotor-Stator Mixers
Rotor-stator mixers are single-shaft mixers with an impeller rotating in close proximity to a stationary housing. They are used to rapidly break apart solid particles in a liquid, or to emulsify a liquid into liquids.
Grinding Mills and Pulverizers
Grinding Mills and Pulverizers are machines that grind materials into fine powders, tiny shards, shapes, or granules on a continuous basis. Often, they are used to process items that are 2 inches (5 cm) in size
Product Announcements
XOMOX (A Crane Co. Company) - Tufline Cage Control Valves
The Tufline sleeved plug valves, manufactured by Xomox Corporation, can be furnished with caged plugs to provide softseat protection in throttling applications and in services with high pressure drop... (read more)
CDF Industries - Wastewater Treatment for Municipal, Oilfield...
CDF Industries designs, builds, and develops treatment processes for industrial wastewater treatment. Our cutting edge clay flocculant technology and quality service has led to wastewater treatment... (read more)
LCR Hallcrest - Color Change Temperature Labels & Ink Formulations
Thermochromic inks, pigment, and coatings provide a cold, touch, or high temperature color change for packaging and labels; available in a temperature range of -10° C to 69° C. Permanent color change... (read more)
Polyonics, Inc. - Polyimide Film for Flexible Electronic Devices
Printable Polyimide Film for Durable, Flexible Electronic Devices To learn more about the unique features of our materials or to request samples, contact a technical expert atinfo@polyonics.com or... (read more)
Topics of Interest

EFFICIENT USE OF FLUORESCENT WHITENING AGENTS AND SHADING COLORANTS IN THE PRODUCTION OF Ciba Specialty Chemicals, Business Line Paper, Water and Paper Treatment, Grazerstrasse 42a, A-8101 Gratkorn,...

3.8 Pigments Pigments for PVC must be thermally and light stable, have good dispersability, and be compatible within the formulation. They may also need to satisfy specific regulations covering the...

Kaolin is a soft, white, hydrous mineral-clay that is based on aluminum silicate [Al2(Si205)(0H)4], but which also contains minor amounts of quartz, feldspar, and sheet silicate minerals (mica,...

Chapter List Chapter 1: Polyamide/clay Nanocomposites Chapter 2: Epoxy Nanocomposites Based on Layered Silicates and Other Nanostructured Fillers Chapter 3: Biodegradable Polymer/Layered...

Sonic's Sonolator high-pressure homogenizing systems and RotoMill Colloid Mills have been widely used to disperse ink and paint pigments. Pigments are insoluble particulates that provide color,...