工藝對比：
1.打碼機：需要有字模，還需要有碳色帶， 相對容易脫落，日期處有壓痕；
2.噴碼機：直接靠油墨噴，你看到的點陣式的日期，一般都是這個，日期處平整。一般不耐有機溶劑擦拭。通常是油墨費用較高；
3.熱壓印：無油墨。常見于某些食品的封口端，靠封口熱壓力實現封口的同時，把熱封條上的文字印刷上去。通常需要調整角度才能看清。
4.激光噴碼：噴射的是一個無法擦掉的{yj}性標記，直接在材料表面淺淺的刻出日期，不易被仿制；免維護，無耗材，無費用，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4 laser printing: spray is a permanent marker can not be erased, directly out of date on the surface of shallow moment, not easy to be imitated; free maintenance, no supplies, no fees, never fade, wipe off the feature.
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