Three dimensional printing (3DP) is one of the most important solid freeform
fabrication (SFF) methods that can produce any material with desired 3D
shape by using suitable powder-binder formulations. It differs from the standard
molding operations in that it can produce a complicated shapes by a software
driven instrument in a laminated fashion and the cost is lower. This method can be applied in a very wide area including drug release operations, biomaterial
production especially for bone fixation, prototype production for all purposes,
wound dressing etc. It can also be used in obtaining edible objects by using natural polysaccharides with water based binders.
In this study, it is aimed to understand the gelling behaviour of some of the
gelling materials, which are alginates, pectins and carageenans, and effect of
various factors on the production of confectionary objects by means of 3DP
process. Effect of multivalent cations, especially Ca2+ ion, on the gelling behaviour of these materials are investigated. The egg-box structure obtained between the polymer segments increases the water holding capacity of the materials and much more chewy structures can be obtained. The molecular changes are followed by
Fourier Transform infrared spectroscopy (FTIR). In 3DP applications, the
composition of powder and binder, pH, temperature, relative humidity (RH) and
machine parameters are important factors affecting the texture of the final object.
The texture of the produced specimens is examined by using a texture analyzer and maximum force values are given as g/cm at failure. Alginate and carrageenans are found to be more effective in obtaining chewy textures with Ca2+ ion content in sugar based matrices and optimization of machine parameters are performed to
obtain a higher resolution on the specimens.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/4/1045392/index.pdf |
| Date | 01 January 2003 |
| Creators | Baydemir, Tuncay |
| Contributors | Bayramli, Erdal |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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