Search

Effects of orders of addition in nanocellulose•cationic starch• colloidal silica systems for papermaking, TAPPI Journal October 2022

ABSTRACT: Two orders of addition were compared when preparing paper handsheets from recycled copy paper furnish in combination with nanofibrillated cellulose (NFC), cationic starch, colloidal silica, and cationic retention aid (cPAM; cationic polyacrylamide). Faster dewatering and higher fine-particle retention were obtained at equal optimized dosages of additives when the colloidal silica was added last, after addition of the cPAM. The same order of addition also provided a higher gain in the paper’s tensile strength. However, higher paper stiffness was achieved when the colloidal silica was instead added to the NFC, after its pretreatment with cationic starch. Results were consistent with the principle that papermaking additives added shortly before sheetforming tend to have the largest effects on drainage and retention. The results also demonstrated a sensitivity to the relative dosages of positively and negatively charged additives.

Tetraethyl orthosilicate-containing dispersion coating — water vapor and liquid water barrier properties, TAPPI Journal September 2021

ABSTRACT: An aqueous styrene-butadiene latex dispersion coating containing in-situ processed tetraethyl orthosilicate (TEOS) applied on paperboard demonstrated improved water barrier performance. Coatings containing TEOS equivalent to 0.8% silicon dioxide (SiO2; dry basis) exhibited water vapor performance of < 25 g/m2/day (23°C, 50% relative humidity [RH]) and liquid water barrier performance Cobb 1800 s of < 6 g/m2, when applied as a single-layer 18 g/m2 coating. Cobb 1800 s barrier performance was still good (< 11 g/m2) at coat weights of 7•10 g/m2. The use of filler materials such as kaolin improved the vapor barrier properties of the coating, but this was not critical to the liquid water barrier properties.

Big Data Analytics: Lessons We Have Learned and Case Studies, 2021 TAPPICon Live (21TAPL)

Big Data Analytics: Lessons We Have Learned and Case Studies, 2021 TAPPICon Live (21TAPL)

Heat Recovery Systems, 2021 TAPPICon Live (21TAPL)

Heat Recovery Systems, 2021 TAPPICon Live (21TAPL)

Discrete Element Method to Model Tension and Bending for Single Layer 3-Dimension Systems with Bimodal and Pseudo-Full Particle Size Distributions of Spherical Particles, 2021 TAPPICon Live (21TAPL)

Discrete Element Method to Model Tension and Bending for Single Layer 3-Dimension Systems with Bimodal and Pseudo-Full Particle Size Distributions of Spherical Particles, 2021 TAPPICon Live (21TAPL)

Comprehensive Performance Tests of the Paper Product Formation and Surface Appearance Quality Analysis and Classification System, 2021 TAPPICon Live (21TAPL)

Comprehensive Performance Tests of the Paper Product Formation and Surface Appearance Quality Analysis and Classification System, 2021 TAPPICon Live (21TAPL)

Numerical Simulation of a Low Consistency Single-Disc Refiner including Analysis of Experimental Rheological Data, 2021 TAPPICon Live (21TAPL)

High Build, Single Coat Epoxy Maintains Critical Path Schedule on Pipeline Rehabilitation Project in International Paper Company’s Mansfield Mill, TAPPICon22

Achieve Superior Performance with TT Headbox, Tissue360º Fall/Winter 2023

New opportunities in the paper and nonwovens industries with foam-assisted web forming and chemical application, TAPPI Journal January 2023

ABSTRACT: Foam-assisted web forming and chemical application technologies have great potential to improve manufacturing efficiency and product quality in the paper and nonwovens industries. In this study, the benefits of foam forming and foam-assisted application of chemicals were demonstrated in a pilot machine trial. Uniform high-bulk webs of unrefined bleached softwood kraft pulp (BSKP) and viscose fibers were manufactured by foam forming. It was shown that foam formed low-grammage and high-bulk viscose fiber webs can be strengthened by foam-assisted application of latex onto the wet web. Correspondingly, foam-assisted application of carboxymethyl cellulose (CMC) and anionic polyacrylamide (A-PAM) improved the strength of the foam formed low-grammage and high-bulk BSKP web. Overall, the pilot machine results indicated that material cost savings could be achieved and a high-performance product could be manufactured with foam-based technologies.