How are you doing?
Im Benson from South Korea and working in Hanoi. Our company is producing mattress and foundation for hotel. But our company has not produced box spring with semi-flex (I attached file ) Many american company is producing box spring with semi flex. I want to know how to make semi flex and machine for semi flex. 
Hi dalaja,
I think you may be asking in the wrong place. This forum is focused on information that can help educate and inform consumers that are looking for a mattress and not the type of information or sources you are looking for.
I also don’t have any knowledge about the South Korean market so unfortunately I’m not able to help you.
Phoenix
PS: it may be worth talking to Leggett & Platt (Southeast Asia) Co., Ltd. and you can find their contact information here.
Thanks for your information!! ^^
I will visit often to get mattress information
Have a nice day!!