Dupont cosmetics solutions presents a new and innovative moulding technology based on the overmoulding of polymer inserts with dupont&trade surlyn®. It broadens the design freedom of thickwalled cosmetic and fragrance containers by enabling the production of contrasting geometries for the internal and external walls, decoration techniques such as the encasing of label and inserts, the simple coloring of the polymer insert using masterbatch, or the application of frosted and glossy effects on the exterior surface directly from the tool.the multitude of design options made possible by this development is very exciting. Intricate shapes and decorative effects, such as sophisticated colors, metallic and fantasy coatings, frosted and unusual tactile properties&ndash most of which are extremely difficult to achieve in extrusion blowmoulding, are easily produced by overmoulding with surlyn®. And now,because glass has been entirely eliminated from the bottle&rsquos design, it is safer and more robust, easier and more costeffective to produce and, lastbut not least, easier to regrind.&rdquothe new, patented overmoulding technology has been developed by dupont affiliate in japan, dupont mitsui polychemicals mdp, a joint venture between dupont and mitsui. It can be used for the scrapfree production of thickwalled bottles and containers with wall thicknesses of 10 millimetres and more. Due to the accuracy of the injection moulding process involved, used on standard machinery and with little extra investment required by the moulder, there is high control of neck diameter and wall thickness. Benefits of the new technology, as an alternative to extrusion blow moulding or the overmoulding of glass inserts, include the costeffective production and decoration of visuallyappealing and more durable containers, which are made entirely of polymer for easy recycling of waste.this breakthrough technology involves the encasing, or overmoulding, of a hollow polymer insert with a thick, yet lightweight, exterior wall of durable surlyn® pc 2000 wellknown in the packaging industry for providing the same transparency and feel as glass without its fragility. Currently working with pet or pp as the material for the polymer insert, as they provide sufficient resistance to the ingredients found in cosmetic lotions. For fragrances, the ingredients of which may be more aggressive to the container, the development of multilayer polymer inserts produced by extrusion blow moulding is underprocess. Benefits of the use of a polymer insert, versus a glass one, include its ease of use in standard moulding tools, the material&rsquos ability to absorb the high injection pressures ofthe overmoulding process without the risk of breakage and its consistent adhesion to the overmoulded surlyn®. Moreover, because no glass is used in the packaging, there are no breakable parts such as the neck for greater usersafety, while any waste may be reground for future use.
