Noting that glass baby bottles often cracked when boiled for sterilization, Yeh then came up with the idea of replacing glass with polyethylene. His factory was the first in the world to produce plastic baby bottles.
之後葉進泰發現許多母親在為孩子煮玻璃奶瓶時，奶瓶會因過熱而破裂，因此又想到用 PE 做奶瓶，是世界第一個生產 PE 奶瓶的工廠。