1. Rotating deep thread

　　 1. In the injection molding process, there is a rotating equipment system in the mold. This action can effectively maintain the integrity of the cap screw. Therefore, the thread shape of the bottle cap can be effectively manipulated, and the bottle cap wall will not be skewed when the thread of the upper bottle shin is rotated.

　　2. In the process of capping the bottle cap, the bottle cap can be converted into a straight force when rotating the upper bottle shin thread to tighten the bottle cushion against the bottle shin.

　　3. Because the screw thread of the rotating tooth cannot effectively restrain the bottle cap gasket legend from falling, so the screw cap is posted with glue when adding the gasket.

　　 4. Rotating deep screw thread has the following defects:

　　 A, this type of thread needs to add multiple pads, which is not ideal.

　　 B. The screw cap restricts the planning of the bottle cap (for example, a bottle cap with a blocked screw cannot be rotated in the mold). Of course, the screw cap mold is more messy in planning, and the cost is more expensive in production.

　　C. There is no restriction on the selection of raw materials when making deep screw caps.

　　 Two, forced off the shallow thread

　　 1. During the injection molding process, the cap can be easily demolded from the mold without the need for mold rotation. Obviously, when planning the screw thread of the bottle cap, the thread must be shallower to allow for "strong release" during the injection molding process, and there must be a moderate thread enough to cover the bottle shin thread perfectly.

　　2. The strong threaded cap can be posted without adding glue when adding the liner. The liner can be effectively restrained by the thread, so that the cap gasket legend is not easy to fall off.

　　3. When you want to add multiple layers of liners to the cap or make a variety of possible plans for the cap (such as blocked thread type bottle caps), forced threading is the first choice.

　　4. Forced-off threaded caps have constraints on raw materials during the injection molding process, during which polyethylene and polypropylene materials are popular choices.