Here's some history about thermoforming. Do you know that our technology is the oldest plastic transformation technique in the World? The first mentioning of heating and forming goes back the old Egyptians.
They heated tortoise shells in hot water and shaped them into useful products, mainly food containers. Also in the prehistory of America, tree bark (natural cellulose) was heated and shaped into bowls and even canoes.
But the most modem approach of thermoforming starts in 185O’s when Guttapercha was used to replace ivory for billiard balls. The ﬁrst thermoforming was obtained by putting cellulose nitrate sheets into metal dies, heated with steam and quenched in water.
The industry didn’t change a lot until 193O’s and as most of the plastic transformation techniques, thermoforming made a big step forwards during the second world war.
In 1942 PMMA ﬁghter/bomber windows were produced as well as relief maps by the US Mapping Service. In 1960 twin-sheet thermoforming was developed and commercialized. There have been more technical advances in the last decade than in the previous ﬁfty years.