Dry blend
As a dry blend or Dry blend (dry blend) is a mixture of a plastics powder with additives , plasticizers or other additives referred to. The name is particularly common when processing polyvinyl chloride (PVC).
During the production of a dry blend, the temperature remains below the softening temperature of the plastic powder. As a result, the mixture remains free-flowing and can be produced at a lower cost than processes that work with a melt , such as extrusion . Since the homogenization in the mixer takes place under strong shear , a cooling step is often followed.
In the case of powder coatings , which, like plastics , are in solid form, effect coatings produced using the manufacturing process of the same name are referred to as dry blends . Here , effect pigments are added to the finished paint and also mixed dry. Occasionally, mixtures of two powder coatings are used to achieve a matt surface, which are then also referred to as dry blends .
Individual evidence
- ↑ a b Declaration on Dry-Blend at www.about.com, accessed on August 12, 2009 .
- ↑ a b H. Römpp; Römpp Lexicon Lacquers and Printing Inks ; Page 170; Thieme; Stuttgart; 1998; ISBN 9783137760016 .
- ↑ J. Keller; Avoid mistakes - know how . In: Journal for Surface Technology , May 2009 edition; Page 16.