The influence of the blowing agent addition and injection molding parameters on the structure of polypropylene moldings

Bociąga, E.; Palutkiewicz, P.

doi:10.14314/polimery.2011.749

Cited by 9 publications

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“…In the available literature the approximate values of the parameters of foam injection molding process are often found, however, there are few research works [9–20], which provide the results of the influence of these parameters on the properties and structure of injection molded parts. The research works [9, 10] present the results of the influence of blowing agent content in the polymer and the injection conditions (injection temperature, mold temperature, injection velocity) on the formation of the structure and properties of molded parts from polypropylene. It was proved, that the effectiveness of the blowing agent (estimated by weight, density, and sink marks reduction in parts), is dependent on processing conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The blowing agent (CF Hydrocerol in a form of granules) in amount of 0.5 to 1% allows to produce high‐quality parts, without sink marks, well imaging the shape and dimensions of the cavity, with no significant worsening of their properties. In an article [9] it has been shown that the low processing temperature has a beneficial effect on the structure of the porous molded parts. At the lower mold temperature (20°C) and lower injection temperature (200–210°C), molded parts having a solid skin layer and a fine cellular core were obtained.…”

Section: Introductionmentioning

confidence: 99%

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The influence of injection molding parameters and blowing agent addition on selected properties, surface state, and structure of HDPE parts

Bociąga

Palutkiewicz

2012

Polymer Engineering & Sci

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The investigation of the influence of injection molding parameters (injection velocity, mold temperature and injection temperature, and additionally, as a result of these three parameters change, injection time, hold time, and cooling time) and blowing agent percentage on selected properties of HDPE molded parts such as weight, density, mechanical properties (tensile strength and elongation at maximum force), surface state (gloss and color), and structure was the aim of this work. The examination showed, that the mold temperature has the main influence on properties and surface state of molded parts from solid and foam HDPE. The weight, density, mechanical properties and gloss of molded parts increased with the increase in mold temperature. The mold temperature also influences significantly the number and size of pores in molded parts. The addition of blowing agent in a quantity of 2% is sufficient to obtain parts with favorable mechanical properties and good surface quality. POLYM. ENG. SCI., 53:780-791, 2013. FIG. 8. The change of the tensile strength of molded parts from HDPE: without blowing agent in function of the injection velocity v w and the mold temperature T f (T w ¼ 2308C) (a); the mold temperature T f and the injection temperature T w (v w ¼ 45 mm/s) (b), with 2% addition of blowing agent in function of the injection velocity v w and the mold temperature T f (T w ¼ 2308C) (c); the mold temperature T f and the injection temperature T w (v w ¼ 45 mm/s) (d), with 4% addition of blowing agent in function of the injection velocity v w and the mold temperature T f (T w ¼ 2308C) (e); the mold temperature T f and the injection temperature T w (v w ¼ 45 mm/s) (f).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The influence of injection molding parameters and blowing agent addition on selected properties, surface state, and structure of HDPE parts

Bociąga

Palutkiewicz

2012

Polymer Engineering & Sci

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“…Uno de los procesos más importantes que han surgido del moldeo por inyección es conocido como inyección microcelular o Mucell ® de la marca comercial de Trexel, basado en el espumado por inyección utilizando espumantes físicos (gas) en estado de fluido supercrítico supercrítico (FSC). 10 Aparte del Mucell®, se han desarrollado procesos como Profoam 25 , Stages Moulding 26 , Pull and Foam 27 entre otros En un proceso de obtención de espumas ajustado al moldeo por inyección convencional, se tiene que la expansión del gas suele estar restringida a la forma y dimensiones de la cavidad o cavidades que tiene el molde de inyección. Una vez que el frente polimérico avanza dentro de la cavidad, se da inicio al crecimiento de las celdas debido al cambio de presión asociado a la entrada del material dentro de la cavidad.…”

Section: 31 Espumado En Inyecciónunclassified

“…Por otro lado, en los puntos óptimos de los sistemas que tenían al EQ como elemento espumante (EQHMS y EQMEV), la temperatura de masa en el nivel inferior del rango de estudio garantiza un material con una reducción en densidad importante sin pérdidas significativas en el módulo de flexión final, que puede estar relacionado con el efecto beneficioso que representa una menor temperatura de masa sobre la estructura celular del material espumado. 25,26 Sin embargo, se necesita la T m en su mayor nivel para las referencias óptimas donde las MEP son el elemento espumante (MEPHMS y MEPMEV), vinculado a la temperatura necesaria para la mayor expansión de este tipo de microesferas.…”

Section: Comparación Entre Sistemas De Espumadounclassified

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Optimización del espumado de Polipropileno en inyección para aplicaciones en automoción basada en diseño de experimentos

Azcárate¹,

Emilio²

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Adj SS De sus siglas en inglés Adjusted Sum of Squares. Suma de cuadrados ajustada. Adj MS De sus siglas en inglés Adjusted Mean Square. Cuadrado medio ajustado. ATR Accesorio de reflectancia total atenuada para el FTIR. B B BP De sus siglas en inglés Back Pressure. Contrapresión. C C CBA De sus siglas en inglés Chemical Blowing Agents. Agentes espumantes químicos. CL Contracción Longitudinal. CM Coste por unidad de masa. CT Contracción Transversal. Coef Coeficiente CV Coste por unidad de volumen. 10|Espumado de Polipropileno en inyección ______________________________________________________________ 9 Seyed H. Tabatabaei, Pierre J. Carreau, Abdellah Ajjiigel. Rheological and thermal properties of blends of a long-chain branched polypropylene and different linear polypropylenes.

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Foamability and Special Applications of Microcellular Thermoplastic Polymers: A Review on Recent Advances and Future Direction

Banerjee¹,

Ray

2020

Macro Materials & Eng

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Figure 6. a) Schematic of underwater pelletization as a following unit of a foam extrusion system. For expandable beads, the water pressure is set above the vapor pressure of the blowing agent; for expanded, it lies at atmospheric pressure. b) Bead foam processing in a steam-chest molding machine: 1: closing and 2: filling the mold, 3: steaming, 4: cooling, 5: ejection of molded part. Reproduced with permission. [53] Copyright 2015, Elsevier.

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The influence of the blowing agent addition and injection molding parameters on the structure of polypropylene moldings

Cited by 9 publications

References 0 publications

The influence of injection molding parameters and blowing agent addition on selected properties, surface state, and structure of HDPE parts

The influence of injection molding parameters and blowing agent addition on selected properties, surface state, and structure of HDPE parts

Optimización del espumado de Polipropileno en inyección para aplicaciones en automoción basada en diseño de experimentos

Foamability and Special Applications of Microcellular Thermoplastic Polymers: A Review on Recent Advances and Future Direction

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