Flow balancing in die design of wood flour/HDPE composite extrusion profiles with consideration of rheological effect

Zolfaghari, Abbas; Behravesh, Amir Hossein; Shakouri, Ehsan; Soury, Ehsan

doi:10.1002/pen.21567

Cited by 16 publications

(15 citation statements)

References 18 publications

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“…Fundamental research has been performed by Xiao and Tzoganakis [7,8,9,10] as well as by Li and Wolcott [11,12,13]. Important contributions to this subject have been also delivered by Oksman Niska and Sain [5], Vlachopoulos et al [14,15,16], and Zolfaghari et al [17].…”

Section: Introductionmentioning

confidence: 99%

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Computer Modeling for Single-Screw Extrusion of Wood–Plastic Composites

et al. 2018

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Abstract:Experimental and theoretical studies have been performed on the single-screw extrusion of wood-plastics composites. Experimental research has been carried out on the flow and melting of polypropylene (PP)-based composites with different wood flour (WF) content in the single-screw extruder. Based on these experimental observations, elementary models of the process phenomena have been proposed and a global model of the process has been developed. This global computer model includes the models of solid conveying, melting dependent on the wood flour content, melt flow in the screw, and melt flow in the die. 3-D non-Newtonian finite element method (FEM) screw pumping characteristics have been applied to model the melt flow in the metering section of the screw. The model predicts the extrusion output, pressure and temperature profiles, melting profile, and power consumption. The model has been validated experimentally. An effect of material slip on the extruder operation has been discussed including both slipping in the screw/barrel surfaces and in the extruding die.

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Section: Introductionmentioning

confidence: 99%

“…With an increase of shear rate the slip velocity increases, which leads to the plug flow (Vlachopoulos and Hristov [15]). Also, an increase in wood content promotes the plug flow (Zolfaghari et al [17]).…”

Section: Introductionmentioning

confidence: 99%

Computer Modeling for Single-Screw Extrusion of Wood–Plastic Composites

et al. 2018

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“…The known sources of porosity creation are: steam given off from still moist wood particles, VOC (volatile organic compound) produced via decomposition of wood during processing, and CO 2 released from highly heated wood particles . Utilizing vented extruders are the best choice in terms of removing VOC, CO 2 , steam, and thus minimizing porosities, as was considered in this study . Adding wood at the second stage promotes less thermal history, which in turn, further suppresses the creation of VOCs and thus porosities.…”

Section: Resultsmentioning

confidence: 99%

Procedure effect on the physical and mechanical properties of the extruded wood plastic composites

et al. 2013

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This article investigates the effect of raw material preparation on the mechanical and physical properties in wood‐plastic composite (WPC) production. Four possible procedures in material preparation to obtain a determined level of wood content are: (i) to use and feed raw materials in the same ratio of the desired composition (single stage), (ii) to use the batch of granules of the same composition (two‐stage), (iii) to add wood to the batch of granules having a lower wood content, (iv) to add polymer to the batch of granules having a higher wood content. The main question then is that, while it is economically attractive to use granules of a fixed wood content in all productions, whether there are noticeable differences in final properties of the products. The examined compositions were 50, 60, and 70 wt% of wood content which are considered as highly filled WPCs and mainly used in the WPC markets. Thus, 12 sets of WPC profiles were manufactured and the processing conditions (temperature, pressure, and outlet velocity) recorded. The flexural properties, impact strength, density, and water uptake were measured. Results revealed that in the production of WPCs with 50 and 70 wt% of wood content, using the WPC granules with the same composition yields better physical and mechanical properties. However, for producing WPC with 60 wt% of wood content, using WPC granules with 70 wt% of wood and adding appropriate amount of polymer exhibit better results. POLYM. COMPOS. 34:1349–1356, 2013. © 2013 Society of Plastics Engineers

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“…Sections of the die are numbered and described in Table . To resolve the issue of flow balancing, two strategies were undertaken: (1) avoiding sharp change in direction of flow from the extruder head towards the die exit, and (2) implementing a flow restrictor mechanism to balance the flow for all cross sections (as proposed by Zolfaghari et al ). The die design consisted of three main zones: adaptor, housing, and land.…”

Section: Die Design Proceduresmentioning

confidence: 99%

A modular extrusion die design to produce continuous glass fibers reinforced PVC‐wood composite profiles

2016

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This paper presents design and manufacture of a modular die to produce profiles of wood plastic composites (WPCs) reinforced with continuous glass fibers. As the strength and fracture toughness of WPCs are not convincing for load bearing applications, strengthening WPC profiles with continuous fibers could provide sufficient strength to meet the requirements. In this study, a modular profile die with various cross sections, i.e., I‐, U‐, and rectangular‐shaped was designed and manufactured. The approach to balance the flow for the various sections was to implement a flow restricting mechanism along the melt flow path. Impregnated glass rovings (IMGRs) were introduced continuously into the flow to reinforce the profiles through specially designed guides. Experimentations indicated the sound performance of the designed and implemented modular die. Three point bending tests were carried out to evaluate the flexural properties. Improvements in flexural strength and modulus were noticeable. The highest improvement in bending strength with four glass fibers was observed to be 23%, 38%, and 58% for I‐, U‐, and rectangular‐shaped profiles, respectively. POLYM. COMPOS., 39:2268–2276, 2018. © 2016 Society of Plastics Engineers

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Flow balancing in die design of wood flour/HDPE composite extrusion profiles with consideration of rheological effect

Cited by 16 publications

References 18 publications

Computer Modeling for Single-Screw Extrusion of Wood–Plastic Composites

Computer Modeling for Single-Screw Extrusion of Wood–Plastic Composites

Procedure effect on the physical and mechanical properties of the extruded wood plastic composites

A modular extrusion die design to produce continuous glass fibers reinforced PVC‐wood composite profiles

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