Danielak, Anna H.

Islam, Aminul

M. Ribo, Macarena

Pedersen, David B.

Colour is one of the most important features which stimulates the perception and functionality of products as it provides the desired appearance and surface finish. It can be applied in polymer processing techniques, which eliminates the painting step, being an advantage over metal, ceramics, wood or glass parts manufacturing. The influence of the pigmentation has been extensively studied in thermoplastics processing techniques, indicating the change of mechanical characteristics and dimensional stability as the mostprominent effects [7]. In photopolymerisation based systems, incorporating pigmentation in the matrix can influence the processing parameters, post-treatment effects and  properties of the final product. This is due to the absorption of the incident light by the pigments. Colour has been found to be one of the main determinants of the level of light intensity utilised to cure a coating of set thickness [2]. Based on the previous research the polymerisation efficiency is the highest for unpigmented resins and the lowest for white material, placing black, blue, red and green in the middle [5]. The advancements in photopolymerisation-based manufacturing techniques and materials, dictates further  study the issue of light absorption and its influence on the geometry of the resulting features. The current research investigates the impact of the pigmentation on  hotopolymers in the curing process, using UV light mask projection method, for micro features reproduction. The critical concern in this analysis is the stability of the resins towards UV light, subjected to varying process parameters in order to determine the minimum achievable layer thickness and optimum UV light intensity for fast, efficient and accurate production of miniaturised parts. The main outcome of this study is creation of a guideline for micro-features manufacturing

Characterisation of the Influence of the Colour in Resin for Micro Parts Production by Photopolymerisation Based Additive Manufacturing System

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