Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"dual-extrusion"”.
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Rheological Considerations for Dual-Extrusion Melt Processing of Dissimilar Polymers in Composite Structures
… molecular weight resin (LMW) simply dissolves. A dual-extrusion process, which minimizes residence time with mismatched temperatures, was used to render a melt-based scheme practical. Dual-extrusion involves the separate plastication of materials prior to combination in a low residence time mixing …
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The development of a dual extrusion blending process and composites based on thermotropic liquid crystalline polymers and polypropylene
… objectives of this work were to improve a dual extrusion process (DEP) which is used to blend thermotropic liquid crystalline polymers (TLCPs) with thermoplastics, determine the mechanism by which TLCP morphology is developed in the DEP and to determine the optimal properties possible in …
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Generation of Multi-Scale Thermoplastic Composites for Use in Injection Molding and Fused Filament Fabrication
… WTCs, then extending the technology to dual-extrusion and fused filament fabrication (FFF) and obtain high-performance multi-scale WTC products. This dissertation initially focused on investigating the processing conditions, in particular mixing histories and processing temperature …
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Generation of Thermotropic Liquid Crystalline Polymer (TLCP)-Thermoplastic Composite Filaments and Their Processing in Fused Filament Fabrication (FFF)
… respectively. The filaments were generated using dual extrusion technology to produce nearly continuously reinforced filaments and to avoid matrix degradation. Rheological tests were taken advantage of to determine the processing conditions. Dual extrusion technology allowed plasticating the …
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Generation of Recyclable Liquid Crystalline Polymer Reinforced Composites for Use in Conventional and Additive Manufacturing Processes
… temperature to blend TLCP and polyamide in the dual extrusion process was devised using rheological analyses to take advantage of the supercooling behavior of TLCP and minimize the thermal degradation of the matrix polymer. The composite filament prepared by dual extrusion was printed and the …
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A study on extrusion of multiple material bonding for fused depostion modeling
… that have been developed by using multiple extrusion and two type materials. The study is focusing on the cabality of singning and joining two different material that often used in the RP especially foor FDM method which are PLA and ABS material. Each of the materials have the different …
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Ink-gel simultaneous embedded 3D printing
… support gel. This assembly would be called the Dual Ink-Gel Extruder (DIGEX). The printed material and the support gel were mixed in the same lab as the 3D printer, and the rheological properties of several concentrations of the support gel were tested and analysed to best enable simultaneous …
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Reclamation and Reprocessing of Thermotropic Liquid Crystalline Polymer from Composites of Polypropylene Reinforced with Liquid Crystalline Polymer
… composites are produced via a patented, dual extrusion process. This unique process yields a fiber which consists of numerous continuous fibrils of the liquid crystalline polymer encased in a thermoplastic matrix. These fibers have been used to form random mats and woven pre-forms, which …
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3D Printing in Cosmetics: Investigating New Skin Delivery Platform
… demands of cosmetic microneedle fabrication. The extrusion-based FDM 3D printer was selected for its accessibility and specific capability to perform dual-material printing, enabling the fabrication of two-part skin patches. These patches comprised a hydrophobic polylactic acid (PLA) backing …