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PET pellets to film sheet
Kodak makes film base from PET pellets, grinding them into powder, then melting and extruding it into a thin sheet. This sheet is stretched, coated, and wound into rolls.
- 🌐 PET pellets are ground into powder to increase surface area for processing.
- 🔥 The powder is heated to 548°F (287°C) and extruded through a die onto a cooled, polished wheel.
- 📏 The resulting thick sheet is stretched both lengthwise (drafting) and widthwise (tentering) to orient polymer molecules and increase toughness.
- ✨ Multiple coatings can be applied for various properties like adhesion, anti-static, or conductivity.
- ⚛️ A nuclear device measures film thickness and feeds back to the die to control extrusion.
A man holds up a strip of film in front of a Kodak factory sign.