Download AddCom 2012 - First for Additives and Compounding by Smithers Rapra; Institute of Plastics Processing PDF

By Smithers Rapra; Institute of Plastics Processing

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Extra resources for AddCom 2012 - First for Additives and Compounding

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1 . 3 . 9 , 3 2 . 9 , 3 1 . 20 0 0 mg Gla ss T r a n sit io n O n se t 1 1 8 . 9 4 °C M id p o in t 1 2 6 . 2 W g ^ -1 Gla ss T r a n sit io n O n se t 1 1 8 . 9 1 °C M id p o in t 1 2 5 . 4 4 m J n o r m a lize d - 0. 45 J g^ - 1 Peak 1 8 6. 19 °C O r d e r No : 1 2 - 0 1 4 DP A M e t h o d : V A S DS C I 2 5 ° 4 m in D 2 0 0 ° 2 0 K N2 5 0 cc dt 1 . 0 0 s [ 1 ] 2 5 . 0 °C , 4 . 0 0 m in N2 5 0 . 0 m l/ m in [ 2 ] 2 5 . 0 . 2 0 0 . 0 °C , 2 0 . 0 0 K / m in N2 5 0 . 0 m l/ m in Sy n ch r o n iza t io n e n a b le d In t e g ra l -2 9 .

Vitamin B2 has three wavelength absorption peaks where damage occurs, in the UV region at 260nm and 370nm, and in the visible at 450nm. By mixing Pyrisma Indigo and Blue, a broad reflectivity centered around 450nm can be created. This together with the UV blocking characteristic will provide a degree of protection to the Vitamin B2. Of course, there will be a visible color to the packaging, as the primary function of these pigments are as effect pigments. However, there will be translucency allowing fill levels and product contents to be seen.

The laser passes through the transmissive part, is absorbed by the part containing the additive, heats, melts and fuses the parts together. Compatible polymers, both chemically and melting point, have to be used. For example, it is possible to weld PC to PC and PC to ABS but not ABS to PET due to the different morphologies. It is also difficult, to laser weld PP to PE, due to the different melting temperatures of the two polymers. Clamping and clamping pressures are also a great influencing factor in successful laser welding.

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