HFFS stands for "Horizontal Form-Fill-Seal". This is a fully automatic packaging machine that can complete bag forming, filling liquid (such as juice) and sealing in one go.
"Spout" refers to the pouring spout attached to the packaging bag, which makes it easy for consumers to pour liquid without spilling it. We often use center spout doypack in the packaging of juice drinks, which is more conducive to consumption and preservation.