s C r e e n T e C H n o l o G y s creen s urfaces 17 Phosphate Installation in R ussia Urethane Screens Sandwich SWG Screens Floating Backing Wire Screens H i g h q u a l i t y s c r e e n s u r f a c e s a r e v i t a l t o t h e p e r f o r m a n c e o f D e r r i c k h i g h s p e e d s c r e e n i n g m a c h i n e s D e r r i c k f a b r i c a t e s c o m p a t i b l e s c r e e n p a n e l s f o r u s e o n a l l m o d e l s i n i t s e q u i p m e n t l i n e A n u m b e r o f D e r r i c k s c r e e n t e n s i o n i n g a s s e m b l i e s a r e a l s o a v a i l a b l e T h e s e g r e a t l y e n h a n c e the performance of our fine mesh and urethane screens Urethane Screens With openings as fine as 75 microns 200 mesh the development of fine mesh high open area urethane screen surfaces is perhaps one of Derricks most notable contributions to the science of fine particle s e p a r a t i o n s W i t h t h r e e t o f o u r t i m e s m o r e e f f e c t i v e o p e n a r e a t h a n c o n v e n t i o n a l u r e t h a n e s c r e e n s D e r r i c k f i n e m e s h u r e t h a n e s c r e e n s u r f a c e s w i l l n o t b l i n d w i t h n e a r s i z e p a r t i c l e s A n d w h i l e a l l u r e t h a n e s c r e e n s a r e w e l l k n o w n f o r t h e i r a b r a s i o n r e s i s t a n c e o n l y D e r r i c k u r e t h a n e s c r e e n s u r f a c e s c o m b i n e l o n g l i f e with capacity and performance rivaling that of conventional woven wire screens Derrick urethane screen surfaces make all other screening technologies obsolete and old notions of low capacity blinding and high screen panel consumption can be discarded F l o a t i n g B a c k i n g W i r e The Floating Backing Wire system now makes it practical to screen materials that would otherwise be i m p o s s i b l e t o s c r e e n d u e t o t h e i r t e n d e n c y t o b l i n d o r b r i d g e t h e s c r e e n p a n e l o p e n i n g s T h e F l o a t i n g Backing Wire system consists of trays holding narrow pieces of coarse woven wire just below the screen panel surface As the screen frame vibrates the Floating Backing Wire bounces up against the back of the screen panel and knocks loose any particles clinging to screen panel Used successfully with damp solids a n d m a t e r i a l s t h a t t e n d t o c l i n g t o t h e s c r e e n s u r f a c e F l o a t i n g B a c k i n g W i r e i s t h e i d e a l s o l u t i o n f o r d i f f i c u l t screening problems Sandwich Screens T h e S a n d w i c h S c r e e n w h i c h c o n s i s t s o f t w o f i n e m e s h s c r e e n s s u p p o r t e d b y a c o a r s e r b a c k i n g w i r e s c r e e n i s bound into a double fold hook strip Interference in the free openings is created by cross wires of the second s c r e e n T h i s l a y e r e d e f f e c t p r e v e n t s p a r t i c l e s f r o m l o d g i n g i n t h e o p e n i n g s o f t h e t o p s i z i n g s u r f a c e T h e c u t point is made by the combination of cross wires from both fine screen surfaces