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% C was used in the Equation (3) along with the MDS which was 22% (calculated with the tensile tester), to obtain the coating e ffi ciency of 1.4 MDS / % C . Nevertheless, this e ffi ciency value does not indicate much if it is not compared with the e ffi ciency of other coatings agents found in the literature. In this case, the e ffi ciency of the Polycoat 38 ® appears to be 45% higher than other coating systems such as the reported by Archer S. et al. [5] with a value of 0.94 MDS / % C , meaning that Polycoat 38 ® have the desired behavior of adhesiveness, softness, and durability for a high-quality creped tissue [9,39–41]. 4. Conclusions A polyamine-based resin (Polycoat 38 ® ) was synthetized by a modified A. Allen method, and was demonstrated to fulfill the requirements as a coating adhesive due to the presence of azetidine groups in its structure which allows interactions with polyoses of creped tissue paper. The presence of these groups was elucidated by FTIR, 1 H-RMN, and charge density analysis. These analyses, together with the GPC and thermogravimetric analysis permitted to know the polymer molecular weight, structure, its thermal stability, and its T g along with Disprosol 17 ® (release agent) at the working temperature of a yankee dryer, were the coating-release agent was applied at a ratio of 1:1.4 respectively. The addition of the chemical couple (coating-release) allowed a uniform profile along the paper roll of the tissue paper and minimal wear on the creping and cleaning blades evidenced in the low caliber of the paper and quality parameters. This also relates to the e ff ectiveness of the coating which was 45% higher than others previously reported. Author Contributions: Conceptualization, C.D.G.T.; Formal analysis, C.V.; Investigation, C.D.G.T., Y.V. and C.V.; Methodology, C.D.G.T., Y.V. and C.V.; Project administration, C.D.G.T.; Writing—original draft, C.D.G.T. and C.V.; Writing—review & editing, C.D.G.T. and C.V. All authors have read and agreed to the published version of the manuscript. Funding: This research was founded by DISPROQUIN S.A.S and COLCIENCIAS (Proyecto 64853 convocatoria 786 de beneficio tributario). Acknowledgments: The authors acknowledge the company Colombiana Tissue for allowing the evaluation of the products in their paper mill. Conflicts of Interest: The authors declare no conflict of interest. References 1. The Basics of Creping in the Tissuemaking Process. Available online: https: // www.tissuestory.com / 2018 / 09 / 26 / the-basics-of-creping / (accessed on 25 September 2019). 2. Michl PE, R.; Robert, A. Polyvinyl Alcohols in Combination With Glyoxlated-Vinyl Amide Polymers as Yankee Dryer Adhesive Compositions. U.S. Patent 5179150, 12 January 1993. 3. Simpson, J.T.; Us, T.N. Thermosetting Adhesives Comprising a Resin Having Azetidinium Functional Groups. U.S. Patent 7781501B2, 24 August 2019. 4. Gui, C.; Wang, G.; Wu, D.; Zhu, J.; Liu, X. Synthesis of a Bio-Based Polyamidoamine-Epichlorohydrin Resin and Its Application for Soy-Based Adhesives. Int. J. Adhes. Adhes. 2013 , 44 , 237–242. [CrossRef] 5. Archer, B.S.; Furman, G. Coating Space TM A 3-D View of Creping Cylinder Coatings. In Associaç ã o Brasileira T é cnica de Celulose E Papel Conference ; Nalco Company: Sao Paulo, Brazil, 2005; pp. 1–8. 6. Wang, S.; Zhang, F.; Chen, F.; Pang, Z. Preparation of a Crosslinking Cassava Starch Adhesive and Its Application in Coating Paper. Bioresour 2013 , 8 , 3574–3589. [CrossRef] 7. Furman, G.; Archer, S. Yankee Coating Systems—The Functional Interface. In Tissue World Americas Conference 2014 ; UBM Asia Trade Fairs Pte. Ltd.: Barcelona, Spain, 2014; pp. 34–53. 8. Furman, G.S.; Harry, X.; Su, W.; Griegoriev, V.A. Modifying Agent for Yankee Coatings. U.S. Patent 8101045B2, 24 January 2012. 9. van Beek, T.A.; Kuster, B.; Claassen, F.W.; Tienvieri, T.; Bertaud, F.; Lenon, G.; Petit-Conil, M.; Sierra-Alvarez, R. Fungal Bio-Treatment of Spruce Wood with Trametes Versicolor for Pitch Control: Influence on Extractive Contents, Pulping Process Parameters, Paper Quality and E ffl uent Toxicity. Bioresour. Technol. 2007 , 98 , 302–311. [CrossRef]
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