Metal screw cap for jars of baby food has plastic coating on inside which is made of foamed polymer in area where it grips thread on jar and unfoamed polymer in area where it forms seal with its lip

摘要

Metal screw cap (D) for jars (G) of food or drink, especially baby food, has a plastic coating (K) on the inside (3). This is made of foamed polymer (K1) in the area where it grips the thread (H) on the jar and unfoamed polymer (K2) in the area where it forms a seal with its lip (5).