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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Microstructure and the distribution of tensile properties in injection molded polyethylene

Moy, Francis H. January 1980 (has links)
No description available.

Mold thermal design and quasi steady state cycle time analysis in injection molding

Hioe, Yunior 08 March 2006 (has links)
No description available.

The dynamics of cavity pressure in thermoplastic injection molding /

Conley, Nancy Ann. January 1985 (has links)
No description available.

The dynamics of injection hydraulics in thermoplastics injection molding /

Abu Fara, Dib. January 1983 (has links)
No description available.

Prediction of shrinkage and warpage in injection moulded components using computational analysis

Riddles, Mornay January 2003 (has links)
Thesis (MTech (Mechanical Engineering))--Peninsula Technikon, 2003 / Injection moulding is a process by which molten polymer is forced into an empty cavity of the desired shape. At its melting point, polymers undergo a volumetric expansion when heated, and volumetric contraction when cooled. This volumetric contraction is called shrinkage. Once the mould cavity is filled, more pressure is applied and additional polymer is packed into the cavity and held to compensate for the anticipated shrinkage as the polymer solidifies. The cooling takes place via the cooling channels where the polymer is cooled until a specific ejection criterion is met. Heat from the polymer is lost to the surrounding mould, a part of this heat reaches the cooling channel surfaces, which in turn exchange heat with the circulating cooling fluid. Due to the complexity of injection moulded parts and the cooling channel layout, it is difficult to achieve balanced cooling of parts. Asymmetric mould temperature distribution causes contractions of• the polymer as it cools from its melting temperature to room temperature. This results in residual stresses, which causes the part to warp after ejection. Given the understanding of the mathematical model describing the heat transfer process during the cooling stage, the objectives of this study were three fold. Firstly, an alternative numerical model for the heat transfer process was developed. The proposed model was used to investigate the cooling stress build-up during the injection moulding process.

A study on material distribution, mechanical properties, and numerical simulation in co-injection molding

Srithep, Yottha 18 March 2008 (has links)
No description available.

The dynamics of injection hydraulics in thermoplastics injection molding /

Abu Fara, Dib January 1983 (has links)
No description available.

Experimental study of anisotropy in injection molded thermoplastic parts

Bakerdjian, Zaven January 1978 (has links)
No description available.

The dynamics of thermoset injection molding and the anistropies of molded parts /

Sidi, Shiraz Ismail. January 1980 (has links)
No description available.

Synthesis and characterization of divinyl monomers for styrene-based reaction injection molding

Sanchez, John Lawrence 28 August 2008 (has links)
Not available / text

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