Quality control is considered a critical aspect of plastic materials in the injection molding process. Two types deformations occur during process, namely, volumetric shrinkage and warpage. This study aims to optimize warpage polyethylene terephthalate preform (PET) used for packing carbonated drinks. PET results an uneven distribution material over wall surface causes variation thickness. Duri...

Four different dye-doped polymer optical fibers (POFs) have been fabricated following a two-step fabrication process of preform extrusion and fiber drawing, using poly-(methyl methacrylate) (PMMA) as host material and dye derivatives from perylene and naphtalimide as active dopants. The side illumination technique (SIT) has been employed in order to determine some optical properties of the fabr...

We report significant advances in the fabrication of low loss chalcogenide microstructured optical fiber (MOF). This new method, consisting in molding the glass in a silica cast made of capillaries and capillary guides, allows the development of various designs of fibers, such as suspended core, large core or small core MOFs. After removing the cast in a hydrofluoric acid bath, the preform is d...

A preform sleeving technique is demonstrated that allows the fabrication of single-mode polymer microstructured fiber with the smallest core and hole dimensions yet reported to our knowledge. For a fixed triangular hole pattern a range of fibers is produced by adjustment to the operating conditions of the draw tower. Numerical modeling is carried out for one of the fibers produced with a 570-mi...

In automatic summarisation it was noticed that knowledge poor methods do not necessary preform worse than those which employ several knowledge sources to produce a summary. This paper presents a comprehensive comparison between several summarisation methods based on term specificity estimation in order to find out which one performs better. In the comparison parameters such as quality of the pr...

We describe an approach for producing robust multimaterial chalcogenide glass fibers for mid-wave and long-wave mid-infrared transmission. By combining the traditional rod-in-tube process with multimaterial coextrusion, we prepare a hybrid glass-polymer preform that is drawn continuously into a robust step-index fiber with a built-in, thermally compatible polymer jacket. Using tellurium-based c...

We report on the fabrication and optical assessment of an all-solid tellurite-glass photonic bandgap fiber. The manufacturing process via a preform drawing approach and the fiber characterization procedures are described and discussed. The fiber exhibits some minor morphological deformations that do not prevent the observation of optical confinement within the fiber by bandgap effects. The expe...

This paper deals with the modelling of injection moulding processes taking into account the deformability of the preform and the polymerisation of the resin. The coupled flow– deformation problem in the infiltrated and dry region is formulated with the corresponding boundary conditions and with the proper evolution equations determining the motion of the boundaries. An approximated analytical d...

In this work, we report the fabrication of an all-polymer multimaterial optical fiber based on two different grades cyclo-olefin polymers (known as Zeonex) and high-performance thermoplastic polysulfone (PSU) with glass transition temperature (Tg) 189°C. The core/cladding structure using Zeonex (E48R/480R, respectively) was developed a co-extrusion method followed by rod-in-tube approach...