工艺对比：
1.打码机：需要有字模，还需要有碳色带， 相对容易脱落，日期处有压痕；
2.喷码机：直接靠油墨喷，你看到的点阵式的日期，一般都是这个，日期处平整。一般不耐有机溶剂擦拭。通常是油墨费用较高；
3.热压印：无油墨。常见于某些食品的封口端，靠封口热压力实现封口的同时，把热封条上的文字印刷上去。通常需要调整角度才能看清。
4.激光喷码：喷射的是一个无法擦掉的{yj}性标记，直接在材料表面浅浅的刻出日期，不易被仿制；免维护，无耗材，无费用，yb掉色，擦不掉的特征。
Process comparison: 1
1 code machine: the need for a font, also need to have a carbon ribbon, relatively easy to fall off, indentation at the date of;
2: inkjet printer ink spray directly on, you see the dot date, this date is generally flat, at. Generally not resistant to organic solvents wipe. Usually higher ink costs;
3 hot embossing: no ink. Common in the sealing end some food, by heat seal pressure sealing at the same time, the heat seal on the text printed up. Usually need to adjust the angle to see.
4 laser printing: spray is a permanent marker can not be erased, directly out of date on the surface of shallow moment, not easy to be imitated; free maintenance, no supplies, no fees, never fade, wipe off the feature.
