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Wyświetlanie 1-15 z 63
Tytuł:
Modeling of flow phenomena associated with polymer injection into a mold
Autorzy:
Przybylski, W.
Dzionk, S.
Powiązania:
https://bibliotekanauki.pl/articles/1954652.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
injection molding
surface layer
plastic
Opis:
The process of plastic injection, although of extensive industrial use, is still relatively poorly researched. In building a finite element model for the injection process, the emphasis was laid on the modeling of phenomena occurring at the polymer-mold interface. With this purpose in mind, the mesh was refined in the vicinity of mold walls. The influence of the air present in the mold during the injection process was also taken into account. As the outcome of solving the problem so formulated, a model of polymer behavior at the mold wall interface has been obtained. Numerical simulations were carried out with the aid of a FIDAP flow-modeling program, and their results were partly verified by experimental means.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 2; 233-241
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interpretation of warpage simulation results in AMSI
Autorzy:
Gajdoš, I.
Jachowicz, T.
Slota, J.
Krasynskyi, V
Powiązania:
https://bibliotekanauki.pl/articles/118149.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
injection molding
warpage
anchor plane
Opis:
The article describes the problematic of interpretation of warpage simulation results in Autodesk Simulation Moldflow Insight. Warpage results are relatively easy to obtain from injection molding analysis, but the result interpretation demands higher skilled user. For detailed warpage evaluation based on specific dimensions is application of anchor plane necessary. Theory of anchor plane creation is described and anchor planes were applied for inspection of critical dimension on molding “terminal box”.
Źródło:
Applied Computer Science; 2015, 11, 2; 5-16
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental verification of computer model for polymer plastication process in injection molding
Weryfikacja doświadczalna komputerowego modelu procesu uplastyczniania polimeru podczas wtryskiwania
Autorzy:
Iwko, J.
Steller, R.
Wróblewski, R.
Kaczmar, J.
Powiązania:
https://bibliotekanauki.pl/articles/947536.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
injection molding
injection molding machine
plasticating system
modeling
wtryskiwanie
wtryskarka
układ uplastyczniający
modelowanie
Opis:
This paper is a continuation of the work on a comprehensive model of the plastication process in injection molding. The aim of this research is the analysis of the results generated by the proposed model by comparing these results with the wide experimental characteristics of real plasticating system of injection molding machine for two polymers — PE-LD and PE-HD, differing in rheological and thermal properties due to the different physical structure of both polymers. It was found that the model correctly determines the dynamics of changes of characteristics of the plastication process by changing the input parameters of the process. The average quantitative differences between the experimental and theoretical characteristics do not exceed 20 %. Computer model still requires minor changes to improve compliance of model results with characteristics of real unit of injection molding machine, primarily for determining more accurate values of melt pressure and torque.
Artykuł stanowi kontynuację prac nad kompleksowym modelem procesu uplastyczniania polimerów podczas wtryskiwania. Porównano wyniki generowane przez proponowany model z szerokimi doświadczalnymi charakterystykami pracy rzeczywistego układu uplastyczniającego wtryskarki, w odniesieniu do dwóch polimerów o odmiennej strukturze fizycznej — PE-LD oraz PE-HD — różniących się właściwościami reologicznymi i termicznymi. Stwierdzono, że model poprawnie określa dynamikę zmian charakterystyk uplastyczniania przy zmieniających się parametrach wejściowych procesu, a średnie ilościowe różnice między charakterystykami teoretycznymi a doświadczalnymi nie przekraczają 20 %. Model komputerowy wymaga jeszcze dopracowania w celu poprawy zgodności charakterystyk wyznaczanych z charakterystykami pracy rzeczywistej jednostki uplastyczniającej wtryskarki, przede wszystkim w zakresie dokładniejszego wyznaczania wartości ciśnienia tworzywa w cylindrze oraz momentu obrotowego ślimaka.
Źródło:
Polimery; 2015, 60, 10; 644-656
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of polylactide modification with blowing agents on selected mechanical properties
Autorzy:
Tor-Świątek, A.
Garbacz, T.
Sedlarik, V.
Stloukal, P.
Kucharczyk, P.
Powiązania:
https://bibliotekanauki.pl/articles/103201.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
polylactide
blowing agent
extrusion
injection molding
Opis:
The article presents research of modification of PLA with four types of blowing agents with a different decomposition characteristic. Modifications were made in both cellular extrusion and injection molding processes. The obtained results show that dosing blowing agents have the influence on mechanical properties and structure morphology. Differences in the obtained results are also visible and significant between cellular processes.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 206-214
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Selected Injection Conditions on the Properties and Structure of Molded Parts Made of HDPE with Chemical Blowing Agent
Autorzy:
Palutkiewicz, Paweł
Postawa, Przemysław
Wawrzyniak, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/2049716.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
injection molding
polyethylene
blowing agents
foaming
Opis:
In this work, the influence of plastic injection molding conditions, mainly plasticizing conditions: plasticizing pressure (back pressure) and decompression (suck-back) after dosing on weight, thickness, mechanical properties and structure of HDPE parts obtained by injection molding with the addition of chemical blowing agent was done. In order to enable the manufacturing of correctly made molded parts under given plasticizing conditions, other parameters (hold time and hold pressure, injection velocity and injection time) were also changed. It was found that making correct molded parts using decompression requires increased hold pressure and hold time. The share of the porous structure in the parts is inversely proportional to the decompression as well as the hold pressure and hold time, while the plasticizing pressure has little effect on thickness, mass, tensile strength and elongation at maximum force, however, it affects the structure of the molded parts to some extent.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 2; 497-502
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Optimization of PHBV-hemp Fiber Biocomposite Manufacturing Process on the Selected Example
Autorzy:
Frącz, Wiesław Jan
Janowski, Grzegorz
Bąk, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/2024015.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
optimization
injection molding
PHBV
biocomposites
hemp fibers
Opis:
In this work, a modern biocomposite on the base of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) matrix commonly known as PHBV was produced in the extrusion process, containing 30% by weight of hemp fibers. The use of the above-mentioned filler allowed to reduce the producing costs of the composite material compared to pure PHBV, improving, among others, some mechanical properties of products made of this biocomposite while maintaining full biodegradation. The obtained biocomposite can be successfully used for the production of injection molded products, but its processing properties are not yet fully known and consequently it is difficult to obtain the optimal performance properties of the products. As part of this study, the process of optimization of the production process of products from the PHBV-hemp fiber biocomposite was carried out on the example of samples intended for testing in the uniaxial tensile test. By using orthogonal planes, widely used in optimization process, the required number of injection molding tests was reduced. Input data values were determined by the factorial planning method that is commonly used in designing experiments. The calculations were carried out in the Minitab 18 software. Six controlling factors were used in the analyzes, each of which was subject to changes on three levels. When selecting the range of controlling factors, it was initially assumed that for all assumed levels of variability it must be possible to fill the mold cavity completely. The orthogonal plan of the L27 type was used in the research. For the purposes of the method, an orthogonal table was built containing 27 combinations of parameters subject to optimization. Optimization was undertaken for two main criteria: shrinkage of the ,,dog-bone” samples (primary and secondary volumetric shrinkage), mechanical properties (Young's modulus, tensile strength, elongation at break). By means of Taguchi method, a significant improvement of some product mechanical properties made of biocomposite was noted and the effective reduction of the processing shrinkage was observed.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 2; 127-137
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the resistance to external factors of low-density polyethylene modified with natural fillers
Autorzy:
Głogowska, K.
Majewski, Ł.
Gajdoš, I.
Mitaľ, G.
Powiązania:
https://bibliotekanauki.pl/articles/102811.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
natural filler
low-density polyethylene
injection molding
Opis:
The study reports the results of investigation of basic processing and thermal properties of low-density polyethylene modified with two types of natural filler: wheat bran and pumpkin seed hulls, their content ranging from 5% to 15% relative to the matrix. In addition, physical properties of the produced granulates are determined, i.e. the relationship between their density and the applied contents of the tested fillers. Furthermore, the study reports the results concerning longitudinal shrinkage, abrasion resistance and cold water absorption of injection molded tensile specimens.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 35-40
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Repetitively Used Feedstock for Powder Injection Molding
Autorzy:
Jang, Jin Man
Powiązania:
https://bibliotekanauki.pl/articles/2174559.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
powder injection molding
recycling
rheology
homogeneity
feedstock
Opis:
This study investigates the effects of repetitive injection molding on the properties of feedstock using the AISI 4140 feedstock. The properties of feedstock are evaluated from the mixing homogeneity of powder and binder, rheological properties, and dimensional accuracy of parts sintered. The feedstock after the 1st injection molding shows a better homogeneity than as-received feedstock due to re-mixing effects between the screw and barrel during the injection molding process. As the number of recycling numbers increases, the homogeneity, viscosities ad shrinkage ratio of recycled feedstocks show slight differences with those of the as-received feedstock until the 6th molding injection. However, some rheological parameters like the moldability index sharply increased up to the 4th injection but shows a tendency to decrease thereafter.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1511--1515
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Common defects in injection molding of plastic products and their influence on product quality
Autorzy:
Chaciński, Tomasz
Sutowski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/1819144.pdf
Data publikacji:
2021
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
injection molding
plastic articles
quality in injection molding
defects in plastic articles
wtryskiwanie
wyroby z tworzyw sztucznych
jakość
uszkodzenia
Opis:
The article deals with issues related to quality management and quality assessment in production of plastic articles in injection moulding. Expert knowledge collected in textbooks and literature allows to get acquainted with the characteristics of plastic article production and product quality defects arising in such processes. The characteristics and technology of plastics processing are discussed, the most frequent quality defects occurring in the production of articles made of plastics by injection molding are listed. On the basis of expert knowledge collected in the literature, a series of actions leading to the elimination of each of the mentioned quality defects has also been proposed.
Źródło:
Journal of Mechanical and Energy Engineering; 2021, 5, 1; 7--14
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Moldflow Simulation in Injection Molding of Plastic Tank
Autorzy:
Tutak, P.
Powiązania:
https://bibliotekanauki.pl/articles/108796.pdf
Data publikacji:
2017
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
simulation
moldflow
tank
charge air cooler
injection molding
Opis:
This article presents an application of moldflow simulation to optimize the injection molding process of charge air cooler plastic tank. The work shows the advantages of this kind of simulation software and information that it can provide. It also explains how big role today play simulation softwares and how they can improve product and reduce development cost.
Źródło:
Journal of Applied Computer Science Methods; 2017, 9 No. 1; 79-88
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of Rheological Properties of Inconel 625 Superalloy Feedstocks Formulated with Backbone Binder Polypropylene System for Powder Injection Molding
Autorzy:
Gökmen, U.
Türker, M.
Powiązania:
https://bibliotekanauki.pl/articles/351256.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
powder injection molding
feedstock
rheological properties
Inconel 625
Opis:
Binder formula is one of the most significant factors which has a considerable influence on powder injection molding (PIM) processes. In the study, rheological behaviors and properties of different binder systems containing PIM feedstocks, Inconel 625 powder commonly used in space industry, were investigated. The feedstocks were prepared 59%-69% (volume) powder loading ratios with three diversified binder systems by use of Polypropylene as backbone binder. The average particle size of the Inconel 625 powder used was 12.86 microns. Components used in the binder were mixed for 30 minutes as dry in three dimensional mixing to prepare binder systems. Rheological features of the feedstock were characterized by using a capillary rheometer. Viscosities of the feedstocks were calculated within the range of 37.996-1900 Pa.s based on the shear rate, shear stress, binder formula and temperature. “n” parameters for PIM feedstocks were determined to be less than 1. Influences of temperature on the viscosities of the feedstocks were also studied and “Ea” under various shear stresses were determined within the range of 24.41-70.89 kJ/mol.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 1937-1944
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Effects of Mold Temperature on the Injection Molded Article
Autorzy:
Han, J.-H.
Kim, Y.-C.
Powiązania:
https://bibliotekanauki.pl/articles/351919.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
injection molding
mold temperature
cooling temperature
molded article
Opis:
This is a study of the effects of temperature of injection mold on the injection molded article. By supplying water of the proper temperature in the cooling line of mold in the cooling process, the mold was the appropriate temperature, and the deformation of the injection molded article was examined according to the mold temperature. In this study, we conducted simulation analysis and experiments, and the results were analyzed. The minimum deformation of the injection molded article model obtained by supplying 50°C water in the cooling line is 0.003 mm, and the maximum deformation was 0.813 mm. Injection molded article models obtained by supplying 20°C water were found to be a minimum of 0.002 mm, with deformation of up to 0.761 mm. When comparing both conditions, the error rate of injection molded article obtained by supplying 20°C water in the mold cooling line was lower by about 0.18%.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1271-1274
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study on mechanical properties of PE/CNT composites
Autorzy:
Najipour, A.
Fattahi, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/279240.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nanocomposite
carbon nanotube
polyethylene
injection molding
mechanical properties
Opis:
High density polyethylene/carbon nanotube composites have been produced for investigations. Four CNT volume fractions and two injection pressures were considered. According to the Taguchi approach, eight experiments were designed. The effect of the carbon nanotubes weight fraction and injection pressure on hardness and impact strength of nanocomposite samples were investigated. The results showed that the effect of the carbon nanotube weight fraction on hardness and impact strength of nanocomposite samples was much higher than the effect of injection pressure. By adding 1%wt (weight) carbon nanotube into the polymer, the impact strength and hardness of the samples improved by 74% and 47%, respectively
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 719-726
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Material Production and the Effect of the System on Biocompatibility in the Modified Metal Injection Method
Autorzy:
Çiçek, Bünyamin
Sun, Yavuz
Powiązania:
https://bibliotekanauki.pl/articles/2203740.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal injection molding
stainless steel
polymer
biomaterial
cytotoxicity
Opis:
In this study, the bio state of the alloy produced in the modified metal injection system was monitored after sintering. A new system operating with high gas pressure, far from the traditional injection model, has been established for material production. In this system, 316L stainless steel powders were molded using a PEG/PMMA/SA polymer recipe. During molding, approximately 60% 316L and 40% binder by volume were used. The samples obtained were sintered at different temperatures (1100-1300°C) after de-binding. Density measurement (Archimedes) and hardness tests (HV1) of the samples were measured as 6.74 g/cm3 and ~285 HV1, respectively. A potentiodynamic corrosion test was applied to monitor the effect of the amount of oxide in the structure of the 316L stainless steel produced. Corrosion tests were carried out in artificial body solutions. The corrosion rate was measured at the level of 17.08×10-3 mm/y. In terms of biocompatibility, a cytotoxicity test was applied to the samples and the life course of the bacteria was monitored. For the 316L alloys produced, the % vitality reached approximately 103%.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 195--204
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Hydrophobic Surgical Forceps using Powder Injection Molding and Surface Treatment
Autorzy:
Park, D. Y.
Park, B. R.
Gal, C. W.
Lin, D.
Han, J. S.
Jeong, M.-S.
Bollina, R.
Hwang, W.
Park, S. J.
Powiązania:
https://bibliotekanauki.pl/articles/352093.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
powder injection molding
hydrophobic
debinding
sintering
surface treatment
Opis:
Hydrophobic surgical forceps of end-effectors for laparoscopic operations or minimally invasive surgery were developed through powder injection molding (PIM) and surface treatment. Processing conditions for mixing, debinding, and sintering were investigated to produce defect-free components. An optimum solid loading was determined by torque rheometry experiments. The optimized processing conditions for debinding and sintering were designed through the measurement of weight loss and shrinkage behavior by thermogravimetric analysis and dilatometry experiments. After producing the surgical forceps based on the optimized processing conditions via PIM, surface treatment was carried out to generate the hydrophobic structure on the surface.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 473-480
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 63

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