A Process Optimization and Performance Study of Environmentally Friendly Waste Newspaper/Polypropylene Film Layered Composites

Abstract

Waste newspaper are currently used in a single way and have low utilization rates. In this paper, the optimal process of preparing environmentally friendly layered composites by using waste newspaper combined with polypropylene film lamination was studied. The effects of hot-pressing temperature, hot-pressing time and paper content on the properties of the composites were analyzed. The results showed that under the process conditions of hot-pressing temperature 180 °C, compression time 20 min and paper content 66.7%, the obtained composite material had a flexural strength of 126 MPa, a tensile strength of 95 MPa, an impact strength of 5.3 kJ/m2 and a water absorption thickness expansion ratio of 3.2%. Tensile performance increased by 164% compared to the original waste newspaper. Compared to our previous work, the hot processing time had been cut in half and costs were lower. In terms of creep properties, the unrecoverable strain rate was reduced by 57.5% compared to pure polypropylene. The results show that the material can maintain excellent flexural strength, tensile strength and water absorption performance while making good use of waste newspaper.

Enhanced Water Resistance of Recycled Newspaper/High Density Polyethylene Composite Laminates via Hydrophobic Modification of Newspaper Laminas

“…The tensile properties of dry and wet NP/HDPE composite samples at different SA concentrations were presented in Figure 9. The dry composite samples showed comparable high tensile strength (from 47-89 MPa) to other paper-based composite laminates (in a range of 58-84 MPa) [7,10,11,35]. The relatively high tensile property was attributed to the dense structure of the composites which can bond the NP fibers tightly and enhance the mechanical interlocking.…”

“…Recycled paper has been widely used to fabricate bio-based fuels, fertilizer and high-valued cellulose products in the past decades [ 1 , 2 , 3 , 4 ]. As a readily available sheet product with desirable mechanical properties, recycled newspaper has been used to fabricate paper-based composite laminates in recent years [ 5 , 6 , 7 ]. Excellent mechanical performances of recycled newspaper composite laminates were achieved by forming a compact structure, which could enhance the fiber-fiber bond of paper sheet [ 8 , 9 ].…”

A Novel Implementation of the LDEM in the Ansys LS-DYNA Finite Element Code

“…Equation (11) indicates that d eq may be regarded as a material property, as it does not depend on the discretisation level but represents a characteristic length of the material (similar to the width of the plasticity region at crack tip in the Dugdale model). Therefore, ε p can be obtained from Equation (11):…”

“…As far as layered materials are concerned, several layers made of different materials are stacked, and may be characterised by different orientations and thickness [10][11][12][13]. Each layer or group of layers is devoted to a specific task, ranging from structural strength to insulation or lightening.…”

Warpage Optimisation Using Recycled Polycar-bonates (PC) on Front Panel Housing

“…The optimal setting of processing parameters for recycled High Density Polyethylene (HDPE) using the Taguchi method was explored, and the results showed that any changes i processing parameters will eventually change or degrade the performance of the shrinkage, tensile strength and flexural strength of moulded parts produced. The optimisation methods used were able to generate an optimal setting of processing parameters to mould [16,17] the parts using virgin and recycled material in the injection moulding process [1,18,19].…”