Thermal and Mechanical Analysis of Polyethylene Homo-Composites Processed by Rotational Molding

Greco, Antonio; Ferrari, Francesca; Buccoliero, Maria Grazia; Trono, Greta

doi:10.3390/polym11030528

Cited by 18 publications

(10 citation statements)

References 20 publications

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“…The aim is to explore and characterize new materials to be used on the rotational molding process to produce differentiated new products with high value, sustainability, aesthetics, and functionality. This study is in line with other recently published articles in the finding of new materials for rotational molding (Greco et al, 2019;Vignali et al, 2019;Fletes et al, 2020).…”

Section: Introductionsupporting

confidence: 93%

Processing–Structure–Properties of Cork Polymer Composites

Martins

Gil

2020

Front. Mater.

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This work aims at presenting a new strategy for the use of cork by-products on the development of sustainable composites with potential applications in rotational molding. In this study, different cork granulometries (0.15-3 mm) and matrix/cork ratios (90/10, 85/15, 80/20) are analyzed to access the processability of medium-density polyethylene (MDPE) with cork by rotational molding. The influence of processing parameters, such as the mold peak internal air temperature (PIAT) (200-240 • C), is analyzed and correlated with the aesthetics, morphological and mechanical properties of the parts. The aim is to obtain a complete understanding of the processing-structure-property relationships. Defect-free parts are obtained with thin granulometric cork powders at a maximum of 10% by weight in PE/cork composites. The increase in cork content reduces the sintering capability and increases the porosity, wall thickness, and surface defects, simultaneously weakening the mechanical properties. The increase in PIAT favors a more compact structure and reveals better impact properties. All the parts are soft on touch and transmit the comfort and sensation of warm feeling of the cork. Moreover, lightweight parts and hydrophobic surfaces are achieved from the cork intrinsic properties. As a natural material, cork darkens its color with temperature, which is attributed to the reactions of the extractives within the components of cork, with no degradation associated. The work shows that polymer cork composites (CPC) are suitable for rotational molding within the processing window characteristic of PE, to achieve innovative and sustainable products with unique aesthetics and functionalities given by the cork material.

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Section: Introductionsupporting

confidence: 93%

Processing–Structure–Properties of Cork Polymer Composites

Martins

Gil

2020

Front. Mater.

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“…Rotational molding is a processing technology suitable to produce hollow parts from small ping-pong balls to large (up to ten thousand liters) tanks [11,12]. Due to its unique characteristics such as low shear and low waste production, lower capital investment costs, lower restrictions on mold design and easier production of multi-layer materials, especially when different composition and thicknesses are required, rotational molding has several advantages over other processing methods.…”

Section: Introductionmentioning

confidence: 99%

Morphological and Mechanical Properties of Bilayers Wood-Plastic Composites and Foams Obtained by Rotational Molding

et al. 2020

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In this work, the suitability for the production of sustainable and lightweight materials with specific mechanical properties and potentially lower costs was studied. Agave fiber (AF), an agro-industrial waste, was used as a reinforcement and azodicarbonamide (ACA) as a chemical blowing agent (CBA) in the production of bilayer materials via rotational molding. The external layer was a composite of linear medium density polyethylene (LMDPE) with different AF contents (0–15 wt %), while the internal layer was foamed LMDPE (using 0–0.75 wt % ACA). The samples were characterized in terms of thermal, morphological and mechanical properties to obtain a complete understanding of the structure-properties relationships. Increases in the thicknesses of the parts (up to 127%) and a bulk density reduction were obtained by using ACA (0.75 wt %) and AF (15 wt %). Further, the addition of AF increased the tensile (23%) and flexural (29%) moduli compared to the neat LMDPE, but when ACA was used, lower values (75% and 56% for the tensile and flexural moduli, respectively) were obtained. Based on these results, a balance between mechanical properties and lightweight can be achieved by selecting the AF and ACA contents, as well as the performance and aesthetics properties of the rotomolded parts.

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“…When manufacturing these molds on numerically controlled machines, their inner surfaces are made for the first time and the outer surfaces are further processed [7,8]. The operation is performed in this way, to avoid stresses that occur during processing, so the inner surfaces will not be affected and the accuracy of the cavities is maintained [9,10]. Unlike conventional machines, an operator only needs to program the CNC machine.…”

Section: Introductionmentioning

confidence: 99%

Applied study on the rotational molding and processing technology of rotational molds

Pop

Țîțu

2021

MATEC Web Conf.

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Computer-aided manufacturing involves a set of computerized activities related to the preparation, launch and follow-up of manufacturing. Computer-aided manufacturing is a tool that allows the use of 3D models based on computer-aided design. This paper addresses the process of rotational formation, with an effective focus on the technology of processing a rotational mold using CAM simulation as a research method. In this sense, the right choice of CNC and cutting tools is essential. The use of numerically controlled machine tools and high-performance cutting tools reduces the number of operations. The manufacturing route realized is specific to the parts machining on numerical control machine, with multiple possibilities such as the execution on a single machine of all the necessary operations to create the mold. PowerMILL gives the user the flexibility to generate thisheir NC programs and ensures the use of the most efficient processing method without having to wait for the complete calculation. A number of different strategies, from the wide range that PowerMILL has, are compared using a high tolerance so that they can be calculated quickly. In this study, the strengths of the CNC are highlighted based on experimental research, features that make this machine a very productive one, saving time, energy and, implicitly, low execution costs.

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Thermal and Mechanical Analysis of Polyethylene Homo-Composites Processed by Rotational Molding

Cited by 18 publications

References 20 publications

Processing–Structure–Properties of Cork Polymer Composites

Processing–Structure–Properties of Cork Polymer Composites

Morphological and Mechanical Properties of Bilayers Wood-Plastic Composites and Foams Obtained by Rotational Molding

Applied study on the rotational molding and processing technology of rotational molds

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