HDPE air ring is a component used in the film blowing process with high-density polyethylene (HDPE) materials. It is placed around the die head of the film blowing machine and serves the purpose of creating a cooling air stream to solidify and cool down the hot plastic film as it exits the die.

The HDPE air ring helps in controlling the film's gauge and cooling it uniformly, ensuring consistent quality throughout the film. By blowing cool air onto the hot film, it helps to set the desired properties, such as transparency, tensile strength, and overall film thickness.

The design of the air ring may differ depending on the specific requirements of the film being produced. It typically consists of an expanding ring that maximizes the contact area between the film and the cooling air stream.

Proper adjustment and optimization of the air flow and cooling settings are crucial for achieving the desired film properties and preventing defects such as bubbles, wrinkles, or uneven cooling.