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Negrini srl is a company which offers, within its structure, complete service, from design to the finished product. Technical design for customized product manufacturing. Planning and realization of the moulds, Production of items using the most suitable plastic materials. Personalization of the finished parts. The outer and inner parts of the cases are in “ABS“ plastic material and are assembled by ultrasonic welding and by the addition of ABS at the fluid state. The features that exalt this material in this use are: its shock resistance and the lack of water in its composition, which, on the contrary, is present in the wooden cases and is released inside when the case‘s temperature changes The inner upholstery is made of cotton and acrylic fabric, which on the bottom and cover is connected with the foamed polyester The connection of the fabric with the foamed polyester cm the cover is made by melting, whilst on the bottom it is made by a solvent free rubber cement and natural resin Application of the rubber cement is made by heating. All the materials used in the manufacturing are corrosive free substances and do not exhale corrosive gases, not even by changing the temperature. The pictures show the available thermoforming presses for plastic sheets up to 150 x 200 cm in size and injection presses for plastic granules up to 1000 ton in power.