What is the Difference Between Cast Grade and Calendered Grade Color Change Films?
1 Answers
Although both are made of PVC, the resulting color change films differ due to variations in production processes. Based on the manufacturing techniques, color change films can be categorized into two main types: calendered grade and cast grade. The thinness of cast grade color change films contrasts sharply with the thickness of calendered grade films, highlighting a significant difference. Here are the distinctions between cast grade and calendered grade color change films: 1. Calendered Grade: In simple terms, the calendered grade process involves producing the film by "extruding and stretching" PVC raw materials, somewhat akin to "pulling noodles." The most notable feature of this method is its affordability, making it suitable for those who frequently wish to change their car's color. However, it also has some drawbacks: the film is relatively thick, has slightly inferior surface smoothness and color uniformity, is prone to adhesive failure over prolonged use, and may fade. 2. Cast Grade: The cast grade process involves mixing all raw materials together and then using an ultra-clean transparent "casting paper" to spread the mixture evenly via specialized equipment, thereby producing the color change film. Some liken this process to "making pancakes"—indeed, there's little difference between crafting films and snacks. High-quality cast grade color change films incorporate additives such as chain plasticizers, high-temperature stabilizers, and UV inhibitors. Since the film does not undergo the "stretching" stage, it exhibits excellent UV resistance, anti-aging properties, shrinkage resistance, and superior product elasticity.
