滚轮热封包装系列ABC之九：关于合理的滚花形状与压痕的推断

Series Ninth of Roller Heat Sealing Packaging：The Inference of Reasonable Knurling Shape and Indentation

合理的滚花形状应当是底角为45°（或更小的角度）的正四棱台形（即滚花的上底和下底均为正方形），这样将可以在较浅的压痕深度条件下，获得较大的压痕开口尺寸，即获得较好封口压痕外观，同时获得较好的热合效果和较小的薄膜形变率。

A reasonable knurl shape should be a positive quadrangular shape （that both the upper and ower knurling are square） with a base angle of 45° （or less than 45° ）, which will allow for a shallow ndentation depth to get bigger indentation opening size, that is to obtain a better appearance of sealing ndentation, while achieving better heat sealing effect as well smaller deformation rate of films.