文档介绍：瓶口螺纹标准
Cap and Neck Finishes
  Screw thread cap sizes are generally expressed as two numbers. The first number refers to the cap diameter (in millimeters) and the corresponding Glass Packaging Institute (GPI)/Society of the Plastics Industry (SPI) finish diameter.
  The second number refers to the height and thread configuration of the closure or finish. Below is a selection monly used caps and finishes.
S=Thread Start
H=Finish Height
T=Major Diameter
E=Minor Diameter
I=Hole Diameter
T - Outside diameter of the continuous thread
E - Outside diameter of the finish shaft excluding thread
I - The inside diameter of the finish at the smallest possible point
S - The distance between the top of the finish to the top of the thread
L - The distance between the top of the finish to the top of the transfer bead   (optional)
H - Height from the top of the finish to the bottom where it intersects with the shoulder
W - The thickness of the transfer bead (optional)
 Standard Plastic Finishes monly Used...
The diameter of Closures
Standard Neck Finishes
( 1 turn of thread)
(1圈螺牙)
( turn of thread)
()
(高位2圈螺牙)
(Tall 2 turns thread)
(Short 2 turns thread)
(低位2圈螺牙)
  Plastic Thread Forms...
Plastic thread form finishes typically have a standard "M" style thread form, shown here. An "L" style can also be used but is not mon. The root dimension will v