One is to blow film, which is to pour plastic particles into the film blowing machine to make plastic film by processing and heating. Here, the quality of plastic film depends on the quality of plastic particles, and the film blown by high-quality particles is absolutely better than that of inferior ones.

二是印刷，印刷分為凸印、凹印、平印、絲印等幾種方式，而塑料袋印刷通常為凹版印刷，使用的機器是凹印機（俗稱印刷機）。當然，要想印出好的花色必須掌握三點，其一熟練掌控印刷機的套版技巧，要求各部位的張力控制設計合理；其二印版的選擇很重要，凹印版的制作分手工版和電刻版兩種，花色不同選擇的印版也不同；其三油墨的選擇及使用，的油墨印刷的效果比較好，但是也要注意其使用過程的量要掌控恰當，不能多也不能少。

The second is printing, which can be divided into embossing, gravure printing, flat printing, screen printing, etc., while plastic bag printing is usually gravure printing, and the machine used is gravure printing machine (commonly known as printing machine). Of course, in order to print good designs and colors, we must master three points. One is to master the printing machine's overprinting skills, and the tension control design of each part is required to be reasonable; Second, the choice of printing plate is very important. The production of gravure plate is divided into two types, namely, industrial plate and electric plate; Third, the selection and use of inks. The printing effect of high-quality inks is relatively good. However, we should also pay attention to the proper control of the amount of ink used.

三是封切，封切很簡單，就是使用封切機把印刷好的塑料薄膜切割成塑料袋。

The third is sealing and cutting, which is very simple. It is to use the sealing and cutting machine to cut the printed plastic film into plastic bags.

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