Mechanical properties of recycled Kraft paper residue polyester composites

João Marciano Laredo Dos Reis,José Luiz Cardoso,Protasio Ferreira E Castro

doi:10.1590/s1516-14392014005000086

João Marciano Laredo Dos Reis, José Luiz Cardoso + Show 1 more

Open Access

https://doi.org/10.1590/s1516-14392014005000086

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Journal: Materials Research	Publication Date: Jun 13, 2014
Citations: 5	License type: cc-by

Affiliation: Universidade Federal Fluminense

Abstract

Construction industry has a significant grow in the past few years. Following that rate, the amount of residue produced from that growth also increases. The need to find alternatives apart from disposing that residue in landfills have led researchers to find new materials from disposal residues. In this paper, kraft paper from cement bags used in building constructions is utilized as reinforcement in unsaturated polyester matrix composites. The kraft paper residue (KPR) was used as shredded particles in different quantities, 30%, 40% and 50%, by weight, and also cutted in sheets to be used as laminas. Tensile and flexural tests were performed to characterize the KPR composites. The results showed that tensile strength and modulus of elasticity increase as shredded KPR content increase. Higher increase was observed when KPR laminas were used as reinforcement. In flexion, a decrease is reported when shredded KPR is used but an increase was observed due to KPR laminas. Flexural modulus was not altered by KPR.

Highlights

In the last decades recycling, reusing and recovering cellulosic fibers have considerably increased
When kraft paper residue (KPR) content increases to 40%, ultimate tensile strength elevates 64.4% and 17.1% higher modulus of elasticity is observed. 50% content of KPR elevates 75.7% the ultimate tensile strength and 17.4% the modulus of elasticity
The difference observed between composites with 30% and 50% of KPR is very small, inside the standard deviation results, producing no significant gap

Summary

Introduction

In the last decades recycling, reusing and recovering cellulosic fibers have considerably increased. Global production of cellulosic fibers (wood pulp) in 2012 was 173.8 million tonnes[9]. Chemical pulp made up 93% of market pulp[10]. From these values, it can be observed that the availability of this raw material is really important and their importance will grow when the consumption per capita of paper in developing countries achieves comparable values to developed countries. Kraft paper is paper from wood pulp manufactured by the Kraft process. The manufacturing process involves pulverizing the wood pulp and blending the material into large sheets of strong brown wood filament[11]

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Results

Conclusion