Paper360 - July/August 2013 - (Page 24)

Inside WWW . TA P P PE R TH E PA I.ORG CK AG AN D PA L JOURNA DU ST IN G IN RIE NI CA S’ TE CH UR L RE SO CE APRIL W W W. TA P P I . O R G 11 Spraying starch to improve strength of containerboard produced from weak recycled furnish Stig Renvall, Jin-Doo Kim, and Topi Tynkkynen 9 HNOLOGY l in film NANOTEC thin film ting of thi RECOVERY BOILER al tes es site Mechanic posites ose compo cs nanocellul g mechanics klin on o sto nston D using buc and Emily D.. Cransto 21 Effects of flashing on spray characteristics of splashplate nozzles Reza Karami, Ari Kankkunen, Nasser Ashgriz, and Honghi Tran Kan COATING 19 19 per pe per COATING paper of coated Economics made from production p z, z, az, deinked pul er, Laurent Patrick HubCarré no and Bru MAY 2013 | VOL. 12 NO. 5 CONTAINERBOARD O. NO. 4 VOL. 12 2013 | M. Kevin H. JOURNAL J T H E PA P E R A ND PAC K AGING IND UST R IE S ’ T E C H NIC A L RESO U RCE AL RE SO 31 Coat weight control in bent blade mode Stig Renvall and Stefan Kuni PRINTING yan Lya na Ly nna Impact of local variation in coating structure on uniformity in print gloss 43 TJ SUMMARIES THE PAPERS SUMMARIZED HERE ARE from the April and May 2013 issues of TAPPI Journal, an online publication of relevant and timely peer-reviewed research delivered via email free to all TAPPI members. To receive TAPPI Journal, join TAPPI at Göran Ström and Janet Preston 33 33 PAPERMA KING ming of forming t Influence on fiber tilt er s e, ne, on Con n condition M. Co sidi n Vahey, JohGregor or cGr o David W. l A. MacG ego hae and Mic 5 45 COATING ated ated t perties cre Barrier pro n coating c ting ist, by dispersio Ny vist, er Nyqv lström, Rog inen, Roger Bolston, Pekka Salm ekk Pe a Janet Pre Toivakka kka and Martti NANOTECHNOLOGY. Buc Buckling pattern of thin film cellulose nanocrystal composite measured by Zygo microscopy. APRIL NANOTECHNOLOGY Mechanical testing of thin film nanocellulose composites using buckling mechanics Kevin H.M. Kan and Emily D. Cranston The Young’s modulus of multilayer films containing cellulose nanocrystals (CNCs) and polyethyleneimine (PEI) was measured using a buckling-based method and compared to analogous films containing nanofibrillated cellulose (NFC) and PEI. For films 61 nm to 1.7 μm thick, the Young’s modulus was constant but strongly dependent on relative humidity. Films were stiffer at lower relative humidities, with modulus values of 16 ± 5, 12 ± 1, and 3.5 ± 0.3 GPa at 30%, 42%, and 64% relative humidities, respectively. CNC/PEI films had larger elastic moduli than NFC/PEI films. Both types of nanocellulose multilayer films showed the same modulus dependence on relative humidity over the range studied. Results suggest that ambient water might have an even more pronounced role in nanocomposites than in traditional natural fiber-reinforced composites. This straightforward buckling-based method has quantified mechanical properties and provided a useful 24 Paper360º JULY/AUGUST 2013 comparison between CNC and NFC fi lms. Furthermore, it qualitatively assesses that the components in the composite film are highly compatible and that the hydrophilicity and hygroscopicity of cellulose and PEI combined do not allow for the full mechanical potential of crystalline cellulose nanoelements to be exploited. This work is one approach toward finding dependable methods to characterize nanocellulose, specifically cellulosic thin fi lms, which is increasingly important as we extract nanocellulose from wood, plants, algae, bacteria, and animals and enter a new age of cellulose materials. COATING Barrier properties created by dispersion coating Roger Bollström, Roger Nyqvist, Janet Preston, Pekka Salminen, and Martti Toivakka The objective of this study was to gain insight into 1) how a coating layer with barrier properties is built up, 2) how different polymer dispersions and pigments function as a barrier against gases and fluids, and 3) how the thickness and evenness of the coating layer affect barrier properties. COATING. Focused ion beam images show alignment of the kaolin particle-filled latex barrier layer for A) blade coated platy, and B) blade coated fine kaolin. Schematic shows the longer pathway for liquid to penetrate the highly aligned platy kaolin coating structure. http://WWW.TAPPI.ORG http://www.APPI.ORG http://WWW.TAPPI.ORG

Table of Contents for the Digital Edition of Paper360 - July/August 2013

Over the Wire . . . News Summary
Ready for Print 2.0?
Eldorado Brasil Begins Operations in the Pulp Industry
Newark’s Frank Papa on Leadership and Innovation
Tissue Mill Dewaters Pulp with Innovative Disc Filter
TAPPI Journal Summaries
Next Generation Enzymes for the Paper and Pulp Industry
The Best Resources for Your Best Resources
Consolidation Watch
Association News
What’s New on

Paper360 - July/August 2013