Effects of repeated extrusion on the properties and durability of rigid PVC scrap

Yarahmadi, Nazdaneh; Jakubowicz, Ignacy; Gevert, Thomas

doi:10.1016/s0141-3910(01)00073-8

Cited by 49 publications

(34 citation statements)

References 9 publications

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“…For example, in a previous study, the tensile modulus of PP composites was 21.9 N/mm 2 , while the tensile modulus of PP composites after 7 extrusion cycles was 21.1 N/mm 2 . Yarahmadi et al (2001) reported that the elongation at break increased by 13% from the first to the third extrusion cycle, which showed a clear correlation between the optimum level of elongation and the maximum mechanical properties obtained. The findings in this study were consistent with the results of the WPCs manufactured with repeated extrusion processing.…”

Section: Mechanical Propertiesmentioning

confidence: 78%

“…Because there was no comparable research found in the search of the literature, the findings of this study were compared with studies of WPCs reproduced by re-extrusion (Yarahmadi et al 2001;Delva et al 2014). In these studies, the properties of WPCs manufactured with the re-extrusion process were reduced with an increase in the number of re-extrusion cycles.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Repeated Injection Molding Processing on Some Mechanical and Thermal Properties of Wood Plastic Composites

Kaymakçı¹,

Ayrılmış²

2016

BioResources

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The influence of repeated cycles of injection molding on some mechanical and thermal properties of wood plastic composites (WPCs) was investigated. Pine wood flour (50 wt%) was mixed with HDPE (50 wt%) containing compatibilizing agent (MAPE, 3 wt%) in a co-rotating twinscrew extruder. The test specimens were produced by injection molding from the pellets dried to the moisture content (MC) of 1%. After the mechanical properties of the WPC test specimens were determined, the failed specimens were subsequently pelletized. These pellets were stored and dried for 4 to 6 h until the repeated injection was molded. These processes were repeated seven times. The results revealed that the flexural strength of WPCs increased by about 5.26% from the original granules to the third injection cycle, but further increments in the number of cycles decreased the flexural strength. The tensile strength and tensile modulus of the WPC specimens increased until the third cycle of injection molding while they tended to decrease after the third injection cycle.

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Section: Mechanical Propertiesmentioning

confidence: 78%

Section: Mechanical Propertiesmentioning

confidence: 99%

Influence of Repeated Injection Molding Processing on Some Mechanical and Thermal Properties of Wood Plastic Composites

Kaymakçı¹,

Ayrılmış²

2016

BioResources

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“…Recycling minimizes the amount of plastics wastes to be disposed of and thus reduces the environmental problems [4]. Recycling of plastics uses less energy than is consumed in virgin resin production and thus competes strongly with virgin resins [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Proportion of Home and External Scrap on the Mechanical Properties of Recycled Pvc: A Comparative Study

Uddin¹,

Gulshan

Kurny³

2015

J. Mech. Eng. Sci.

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Raw material powder mixtures have been prepared with PVC resin, unplasticized polyvinylchloride (uPVC) scrap and additives. A twin screw extruder has been used to make pipe for sample preparation from the mixture. Domestic and external uPVC scrap were formulated and blended with PVC resin to form melt compound. Domestic samples designated as DS-10, DS-20, DS-30, DS-40, DS-50 and DS-100 have been prepared by blending 10, 20, 30, 40, and 50 phr and 100% uPVC domestic scrap with PVC resin and various additives, followed by extrusion, flattening and machining. Following a similar procedure, external samples such as ES-10, ES-20, ES-30, ES-40, ES-50 and ES-100 have been prepared using external uPVC scrap. The effects of the proportions of uPVC scrap in the raw material mix on the mechanical properties such as break stress (BS), % elongation at break, flexural yield strength [1], impact strength (IS) and Shore hardness were investigated. The maximum decrease in break stress is 11.40% for 20 phr domestic scrap, while in samples containing external scrap this decrease is 15.71% for 40 phr scrap. The minimum and maximum reduction in IS values of DS are recorded 1.0% for DS-10 and 27.4% for DS-40, respectively, whereas the minimum and maximum decrease in IS values of ES recorded are 9.6% for ES-10 and 39.2% for ES-50, respectively. The minimum and maximum increase in hardness values of DS are recorded as 0.07% for DS-40 and 2.8% for DS-10, respectively, whereas the minimum and maximum reduction in hardness values of ES are recorded as 1.2% for ES-50 and 2.2% for ES-20, respectively. The mechanical properties of samples were found to deteriorate with increasing quantity of scrap in the raw material mix, the effects of external scrap being more prominent.

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“…Previous researches on the use of recycled PVC mainly focused on the blending of virgin and recycled PVC [5][6][7][8][9][10], the blending of recycled PVC with different polymers [11][12][13][14], and the effect of aging due to the repeated use of PVC [15]. However, most researches focused on the variation of static mechanical properties, and investigations on long-term durability are very scarce.…”

mentioning

confidence: 99%

“…Ajji [13] investigated the variation of mechanical properties of virgin and recycled PVC and polyethylene (PE) based on additives and peroxides. Yarahmadi et al [15] studied the variation of physical properties when repeatedly using extruded PVC, and observed the long-term degradation behavior using accelerated thermal ageing tests. In this paper, the effect of using pre-consumer PVC scraps (which can be collected during the pipe manufacturing process then mixed with virgin pipe grade PVC) on static and long-term mechanical properties is studied.…”

mentioning

confidence: 99%

Investigation of fatigue and mechanical properties of the pipe grade poly(vinyl chloride) using recycled scraps

Lee¹,

Moon²,

Lee³

et al. 2015

Express Polym. Lett.

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Effects of repeated extrusion on the properties and durability of rigid PVC scrap

Cited by 49 publications

References 9 publications

Influence of Repeated Injection Molding Processing on Some Mechanical and Thermal Properties of Wood Plastic Composites

Influence of Repeated Injection Molding Processing on Some Mechanical and Thermal Properties of Wood Plastic Composites

Effect of Proportion of Home and External Scrap on the Mechanical Properties of Recycled Pvc: A Comparative Study

Investigation of fatigue and mechanical properties of the pipe grade poly(vinyl chloride) using recycled scraps

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