The production of open-end metal zippers requires a two-step reinforcement process that utilizes the metal zipper film sealing machine and the metal zipper hole punching machine. This workflow is essential for ensuring that the bottom of the zipper-where the pin and box are later fixed-is strong enough to withstand the stress of repeated engagement and disengagement. The first step involves the metal zipper film sealing machine, which applies a specialized reinforcement film (usually made of a high-strength polymer) to the tape edges that have been cleared by the gapping machine. This film is heat-sealed onto the tape, providing a smooth, rigid surface that prevents the tape from fraying and creates a solid base for the subsequent hardware. The usage steps for film sealing require precise temperature control; if the heat is too low, the film will peel off, but if it is too high, the polyester tape may melt or warp.

Once the film is securely sealed, the zipper chain moves to the metal zipper hole punching machine. This machine uses a descending mold to punch a precise hole through the reinforced tape. This hole is where the pin and box will eventually be anchored. The accuracy of the metal zipper hole punching machine is paramount; if the hole is off-center by even half a millimeter, the final pin-box fixing will be misaligned, making the zipper difficult or impossible to close. Industry consulting experts emphasize that these two machines must be perfectly synchronized in a continuous production line. If the film sealing is inconsistent, the punching mold will experience uneven wear, leading to jagged holes. From a raw material perspective, the development of eco-friendly, recyclable reinforcement films is a major trend in 2024, requiring machines to have more sensitive heat settings to handle various material compositions. By mastering the integration of film sealing and hole punching, manufacturers can produce high-quality open-end zippers that are durable enough for heavy winter coats and industrial workwear, fulfilling the "grand plan" of a fully automated and reliable zipper manufacturing facility.