The Invisible Number That Shapes Your World: Mastering Blow Up Ratio in Plastic Film
Picture this: molten plastic emerges from a circular die, a skilled operator injects air, and—like a glassblower’s magic—a shimmering bubble inflates skyward. This delicate dance isn’t artistry alone; it’s governed by a silent puppeteer: the blow up ratio (BUR). Get this ratio wrong, and your food packaging tears, your agricultural film cracks, or your medical…