Guangzhou, China -- Seven-zone PU mattresses have been commercialised by BNP a sister company of DUT of Korea.
Unlike conventional mattresses, the zones are made inside the block on the conveyor. Although the set up is more expensive than convention mattresses manufacturing methods, it is cheaper to make the individual mattresses.
DUT launches seven zone one block mattress

Jung developed the seven region one-shot mattress with Dow Polyurethanes
This is because there is no need to cut and glue mattress components together, said Jung.
Yong Chai Jung DUT CEO said his company worked with Dow Polyurethanes on the different formulations needed to make the mattress. The different formulations are poured adjacent to each other in the foaming machine
The process involves four PU formulations of visco, semi-visco and HR foam. dispensers through seven nozzles. One for each comfort zone of the mattresses.
Jung said his firm had been 'supported 100% by Dow Polyurethanes.'
BNP is marketing the mattress directly to consumers under the Healthy Spine bedding range as a bed-in-box product. It is also being sold as a layer in conventional hybrid mattresses.