The effect of mold temperature and injection velocity on selected properties of polyethylene moldings

Bociaga, Elzbieta

doi:10.14314/polimery.2000.830

Cited by 8 publications

(7 citation statements)

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“…Tensile properties of ABS vary at different temperatures; in this paper, the temperature of ABS was divided into two parts including below and above the transition temperature. Previous studies had shown that the range of glass transition temperature is 100°C-110°C [24], so the glass transition temperature 105°C was chosen as the boundary between glassy state and high-elastics state of ABS.…”

Section: Parameter Identificationmentioning

confidence: 99%

Tensile Behavior of Acrylonitrile Butadiene Styrene at Different Temperatures

Jia

et al. 2020

Advances in Polymer Technology

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Temperature greatly influences the mechanical response of acrylonitrile butadiene styrene (ABS). The tensile behavior of ABS was explored in this study. The tensile experiments were conducted at a wide range of temperatures (from 40°C to 130°C). A model was established to reveal the quantitative relationship between temperature and tensile behavior of ABS. The results of tensile experiments showed that tensile behavior of ABS exhibited glassy state and high-elastics state. The model was also divided into two parts that rely on the boundary of glass transition temperature, in which the parameters of the model were calculated by the fitting method. The model predictions showed a good agreement with the results of the experimental tensile test. This study provides the quantitative relationship between temperature and tensile behavior of ABS, which saves time and experimental costs.

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Section: Parameter Identificationmentioning

confidence: 99%

Tensile Behavior of Acrylonitrile Butadiene Styrene at Different Temperatures

Jia

et al. 2020

Advances in Polymer Technology

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“…Previous studies have shown that elevating the mold cavity temperature before injection is one of the most effective methods to overcome the drawbacks including weld lines, surface marks, short shots, poor finish, etc . Using the mathematical model described in this article, rapid heating and cooling process for different RHCM cycles were numerically studied for the experimental RHCM mold described in previous section.…”

Section: Resultsmentioning

confidence: 99%

“…However, this cold mold cavity may significantly decrease the melt temperature, increase the melt flow resistance, and form a “frozen layer” near the cold cavity surface in the filling stage. Poor flow ability for the melt near the cavity surface can cause many defects on the molded plastic parts, involving sink marks, flow marks, weld lines, short shots, poor mechanical properties, and poor surface qualities . Elevating the cavity temperature in melt filling process is one of the most efficient methods to eliminate these defects .…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations on polymer melt flow phenomenon in a vario‐thermal mold cavity

Liu

Zhang

Zhao

et al. 2017

J of Applied Polymer Sci

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Mold temperature is one of the key factors affecting the morphology and quality of plastic parts. This article explores the melt flow phenomena in a vario-thermal mold cavity. A coupled numerical method, considering the conjugate heat transfer between the mold and melt, is developed for the melt flow simulation. Mold temperature variations and melt flow phenomena for short shot injection in an electrical heated mold cavity are numerically studied and verified by experiments. The results indicate that the melt flow length and cavity filling ratio increase significantly with the elongation of the preheating time before injection. Melt filling ratio increased nearly linearly with the increasing of electric heating time. The smaller the injection pressure is, the bigger the relative filling ratio increment is. Therefore, polymer melt can flow much longer or the mold cavity can be filled up with a smaller injection pressure when the cavity is preheated.

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“…Pewne szczególne cechy wyprasek (mechaniczne, cieplne, elektryczne) mog¹ byae uzyskiwane dziêki zastosowaniu tworzyw o okreoelonych w³aoeciwooeciach na podstawie, na przyk³ad, mieszanin polimerowych lub materia³ów z ró¿nymi nape³niaczami (w tym proszki metalowe i ceramiczne, proszki magnetyczne), b¹dŸ te¿ na drodze obróbki cieplnej gotowych wyprasek [1][2][3][4][5]. Wiele z nich mo¿na wytwarzaae w konwencjonalnym procesie wtryskiwania, dobieraj¹c umiejêtnie warunki jego prowadzenia, tak aby uzyskaae wypraski o okreoelonych cechach jakooeciowych [6][7][8][9]. Przyk³adem mo¿e byae wzrost temperatury formy wtryskowej w celu zwiêkszenia stopnia krystalicznooeci two-rzywa, zmniejszenia naprê¿eñ w³asnych i skurczu b¹dŸ polepszenia stanu powierzchni wypraski [2,7,8].…”

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“…Wiele z nich mo¿na wytwarzaae w konwencjonalnym procesie wtryskiwania, dobieraj¹c umiejêtnie warunki jego prowadzenia, tak aby uzyskaae wypraski o okreoelonych cechach jakooeciowych [6][7][8][9]. Przyk³adem mo¿e byae wzrost temperatury formy wtryskowej w celu zwiêkszenia stopnia krystalicznooeci two-rzywa, zmniejszenia naprê¿eñ w³asnych i skurczu b¹dŸ polepszenia stanu powierzchni wypraski [2,7,8]. Jakooeae ta zale¿y równie¿ w istotnym stopniu od budowy formy wtryskowej, a zw³aszcza od warunków przep³ywu tworzywa w jej kana³ach [10][11][12][13].…”

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Criterion for the choice of injection method

Bociaga¹

2010

Polimery

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Streszczenie -W artykule o charakterze przegl¹du literatury przedstawiono ogólne wymagania stawiane przez u¿ytkowników wyrobom wtryskiwanym oraz szczegó³owo opisano podstawowe kryteria wyboru metody wtryskiwania umo¿liwiaj¹ce spe³nienie poszczególnych obszarów tych wymagañ. Uwzglêdniono przy tym nastêpuj¹ce w³aoeciwooeci wyprasek: ich cechy geometryczne (rozmiary, grubooeae oecianek i jej zró¿nicowanie, prosty b¹dŸ z³o¿ony kszta³t), estetyka, ciê¿ar (tabela 1), w³aoeciwooeci mechaniczne, ró¿norodne w³aoeciwooeci u¿ytkowe, koszty wytwarzania, wielkooeae serii produkcyjnej oraz wymagania dotycz¹ce terminu, a tak¿e mo¿liwooeci recyklingu. S³owa kluczowe: wtryskiwanie, cechy wyprasek, kryteria wyboru. CRITERION FOR THE CHOICE OF INJECTION METHODSummary -In this review the general requirements set by consumers of moulded products as well as a detailed description of basic criteria for selecting a particular injection method in order to fulfill of the specific areas of these requirements have been presented. The following properties of moulded parts were taken into consideration in making the choice of criteria: geometrical properties [dimensions, wall thickness and their variations, simplicity or complexity of shapes ( Fig. 1)], esthetics (Figs. 3 and 4), weight (Table 1), mechanical properties ( Fig 5), variety of application properties (Fig 6), production costs, volume of production series and deadlines (Figs. 7 and 8) as well as recycling possibilities.

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The effect of mold temperature and injection velocity on selected properties of polyethylene moldings

Cited by 8 publications

References 0 publications

Tensile Behavior of Acrylonitrile Butadiene Styrene at Different Temperatures

Tensile Behavior of Acrylonitrile Butadiene Styrene at Different Temperatures

Numerical and experimental investigations on polymer melt flow phenomenon in a vario‐thermal mold cavity

Criterion for the choice of injection method

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