Method 1: Find the tap and measure the tap entrance as wide as possible.

Method 2: 1: single roll = finished product width *2+ 1CM finished product width *2, as everyone knows. Is the width after crimping. +1CM means that the single edge is one side. +1CM is a folding tent on one side.

2: Double roll = finished product width *2+2CM .. The reason is the same as above.

The above is the most correct and impeccable method.

Actually, according to the stretching and shrinking of the fabric, it should be +-0. 1~0.2CM.