ALKYL KETENE DIMER (AKD) SIZING OF RECYCLED-VIRGIN CARDBOARD WITH ENGINEERED HETEROGENEOUS LAYERS UNDER NEUTRAL AND ALKALINE CONDITION

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ELYASI BAKHTYARI SH.; JALALI TORSHIZI H.; RESALATI H.

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Journal: Journal of Wood and Forest Science and Technology Year:2016 | Volume:23 | Issue:1 Page(s): 1-19

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Title

ALKYL KETENE DIMER (AKD) SIZING OF RECYCLED-VIRGIN CARDBOARD WITH ENGINEERED HETEROGENEOUS LAYERS UNDER NEUTRAL AND ALKALINE CONDITION

Author(s)

ELYASI BAKHTYARI SH. | JALALI TORSHIZI H. | RESALATI H. | Issue Writer Certificate

Keywords

SIZINGQ1

ENGINEERED MULTI-LAYER RECYCLE BOARDQ1

WATER ABSORPTIONQ1

STRENGTH PROPERTIESQ2

Abstract

Background and objectives: Resistance to liquid sorption is important in various paper and board applications which would be contributed by chemicals as hydrophobizers of the structures. The hydrophobization process is called; SIZING, that could be done as internal and surface treatment with prevalence happening on internal SIZING. Necessity and inspirations of recycled fiber together with bringing of required properties in the product, predominate engineering layering of paper and board production to supply and compromise requirements. The aim of this study focused on internal SIZING effects of alkyl ketene dimer in multilayered cardboard constructed of heterogeneous and diverse fiber in its different layers.Materials and methods: Multilayer cardboard (330 g/m2) patterned on the engineered heterogeneous layering of recycled and virgin pulp was internally sized by Alkyl Ketene Dimer (AKD) as 1% based on the pulp O.D. in two papermaking conditions; neutral and alkaline. Then, the effects of the considered conditions on the recycled-virgin board properties were evaluated such as top and back layers Cobb test, bulk, gloss, surface roughness and strength criteria.Results: The cellulose reactive nature of cationic alkyl ketene dimer led to improvements in strength and water sorption of the sized board compared to the unsized one. Resistance to water sorption in the fibrous network have occurred after the fiber bonding and have not been as an effective obstacle in fiber bonding. At alkaline condition, all of addressed properties, especially water sorption and strengths of the board, improved considerably compared to the neutral. In alkaline condition, regarding to more ionization of fiber surface carboxylic groups, more and better bonding is occurred between fiber and AKD, as a cationic SIZING agent, resulted in a reduction in water sorption and provided more bonding ability among pulp ingredients. On the other hand, higher swelling of the ingredients together with the higher cationic demand of the fiber at alkaline situation, enhanced fines retention and fiber bonding which results in the board surface smoother.Conclusion: The SIZING treatment of multi-layer cardboard by AKD reduced its water sorption in top and back layers and its surface roughness. Increment of bulk and STRENGTH PROPERTIES of the cardboard include tensile, bending stiffness and ply bond were observed as a SIZING results, with no effect on the duplex cardboard gloss. The noted improvements were attributed to the bonding enhancement among fibers and also the board layers via AKD, followed by SIZING agent curing at drying section lead to the hydrophobic creation in the board structure and lower water sorption.

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APA: Copy

ELYASI BAKHTYARI, SH., JALALI TORSHIZI, H., & RESALATI, H.. (2016). ALKYL KETENE DIMER (AKD) SIZING OF RECYCLED-VIRGIN CARDBOARD WITH ENGINEERED HETEROGENEOUS LAYERS UNDER NEUTRAL AND ALKALINE CONDITION. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, 23(1), 1-19. SID. https://sid.ir/paper/156670/en

Vancouver: Copy

ELYASI BAKHTYARI SH., JALALI TORSHIZI H., RESALATI H.. ALKYL KETENE DIMER (AKD) SIZING OF RECYCLED-VIRGIN CARDBOARD WITH ENGINEERED HETEROGENEOUS LAYERS UNDER NEUTRAL AND ALKALINE CONDITION. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY[Internet]. 2016;23(1):1-19. Available from: https://sid.ir/paper/156670/en

IEEE: Copy

SH. ELYASI BAKHTYARI, H. JALALI TORSHIZI, and H. RESALATI, “ALKYL KETENE DIMER (AKD) SIZING OF RECYCLED-VIRGIN CARDBOARD WITH ENGINEERED HETEROGENEOUS LAYERS UNDER NEUTRAL AND ALKALINE CONDITION,” JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, vol. 23, no. 1, pp. 1–19, 2016, [Online]. Available: https://sid.ir/paper/156670/en

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