This injection mold produces the plastic liner component used in ROPP (Roll-On Pilfer-Proof) screw caps for wine, spirits, olive oil, and premium vinegar bottles. The liner is the inner sealing element that provides both the threaded engagement and the oxygen-barrier sealing surface against the bottle's rim. The mold is designed to produce liners from specific materials such as Saranex, PVC-free polyethylene foam, or tin/lead-free PVdC-coated compounds, depending on your wine or spirit bottling requirements. Each cavity produces a liner with precision-engineered sealing ridges (typically 2 to 4 concentric rings) that compress against the glass bottle rim to create a leak-proof seal capable of withstanding 5 bar internal pressure. The mold incorporates a hot runner system with closed-loop temperature control to prevent thermal degradation of sensitive liner materials. Cavity surfaces are diamond-turned to Ra 0.01μm and coated with nickel-PTFE to ensure perfect liner release without sticking. An integrated pick-and-place system can be added for automated liner insertion into aluminum shells on your assembly line. Ruiluo works directly with wineries and spirits bottlers to match the liner geometry to your specific glass finish dimensions (STD, BVS, or F-type finishes). We provide complete dimensional inspection reports for 30 sample liners per cavity. Typical cavity counts range from 12 to 36 cavities, producing 6,000 to 18,000 liners per hour.