Paper Mills & Specialty Pulp

Pulp Optical Whitening & Cellulose Bluing Neutralization

RS Pigments synthetic Ultramarine Blue functions as a vital physical optical bluing agent in paper production, neutralizing natural cellulose yellowness to achieve superior ISO brightness, balanced whiteness, and non-fading paper sheets.

Request Application Sample Request Commercial Quote

BfR Recommendation XXXVI for Food Contact Paper & Board

FDA 21 CFR § 176.170 & 176.180 (Aqueous and Fatty Foods)

CONEG Heavy Metals < 100 ppm Total Certification

Biodegradable Carrier Friendly & Compostable Safe

ISO 9001:2015 Registered Manufacturing

Industrial Verification

Paper Mills & Specialty Pulp Grade Tested in Production Formulation

High Tint Strength

Formulation Advantages

Manufacturing Challenges & How RS Pigments Solves Them

Technical bottlenecks in paper mills & specialty pulp often result from pigment agglomeration, heat degradation, or resin interaction. Our refined inorganic formulations eliminate these issues.

0 1

Natural Cellulose Yellowness in Virgin and Recycled Pulp

Industry Bottleneck: Wood fibers, lignin traces, and recycled de-inked pulp carry a natural yellow cast. Fluorescent whitening agents (OBAs) alone cannot fully compensate and degrade rapidly under indoor fluorescent and natural light.

RS Pigments Solution: Synthetic Ultramarine Blue absorbs complementary yellow wavelengths (570–590 nm), providing permanent, non-fading physical optical whiteness without relying entirely on fugitive chemical brighteners.

0 2

Low Single-Pass Pigment Retention in Wet-End Papermaking

Industry Bottleneck: Fine pigment particles pass through the fourdrinier forming fabric into the white water system, leading to high chemical losses, foaming, and wastewater contamination.

RS Pigments Solution: Our paper-grade ultramarine is engineered with an optimized ionic surface charge that binds readily with cationic retention aids and alum, achieving single-pass retention rates exceeding 88%.

0 3

Two-Sidedness and Mottling in Finished Paperboard

Industry Bottleneck: Differential drainage forces on high-speed paper machines cause pigment particles to settle unevenly, resulting in noticeable shade variation between the felt and wire sides of the sheet.

RS Pigments Solution: A narrow, tightly controlled particle size distribution ensures uniform fiber entrapment throughout the sheet thickness, eliminating two-sidedness in premium printing paper and packaging board.

Recommended Pigment Grades for Paper Mills & Specialty Pulp

Tailored micronized formulations providing optimal color yield, dispersion ease, and thermal resistance.

Grade Name	Target Polymer / Medium	Heat Ceiling	Performance Benefit	Product Page
RS-ULTRA-PULP Wet End	Machine Chest Stock Addition (Bleached Kraft, Recycled Pulp)	Up to 250°C (Drying cylinders)	High slurry dispersibility, exceptional retention, permanent optical whiteness.	Specifications
RS-ULTRA-PAPER Surface	Size Press, Calender Starch & Blade Coating Formulations	Up to 260°C	Low abrasiveness on doctor blades, uniform sheet smoothness and gloss.	Specifications
RS-VIOLET-PULP (PV 15)	Specialty Security Paper & Tinted Writing Sheets	Up to 250°C	Delicate reddish-violet shading, water-fast, zero bleeding under sizing.	Specifications

Processing Guidelines

Dispersion, Dosing & Medium Compatibility

Recommended Dosing: 0.01% – 0.08% (100–800 grams per metric ton of dry pulp fiber) for optical whiteness; up to 1.5% for solid blue packaging paper

Processing Temperature Range: Machine drying cylinders operating at 100°C–140°C

Dispersion & Milling Recommendation: Prepare a 10%–20% aqueous master slurry using low-shear agitators before metering into the blending chest, machine chest, or fan pump intake.

Compatible Polymers & Substrates

Bleached Chemical Pulp (Softwood / Hardwood Kraft) Mechanical & Thermomechanical Pulp (TMP) De-Inked Recycled Fiber (DIP) Starch-Based Size Press Dispersions Calcium Carbonate & Kaolin Clay Coating Slurries

Custom compounding formulations and spectrophotometric shade matching available upon request.

Request a Formulation Trial Sample for Paper Mills & Specialty Pulp

We supply complimentary 1kg and 5kg laboratory trial packs with lot-specific Certificates of Analysis (CoA) for qualified compounders.

Request Laboratory Sample Contact Applications Engineer