塑料包裝袋是以組成或天然的高分子樹脂為首要資料。添加各種助劑后，在必定的溫度和壓力下具有延展性，冷卻后可以固定其外形的一類資料。

Plastic packaging bag is based on the composition or natural polymer resin as the primary information. After adding various additives, it has ductility under certain temperature and pressure, and its shape can be fixed after cooling.

天然或組成高分子樹脂分子在熔融狀態下，且附近均勻的分布助劑分子的進程叫塑化，早年抵達了這個進程叫早年塑化了，還沒有抵達，被認為沒有塑化。

When the natural or constituent polymer resin molecules are in the molten state and the auxiliary molecules are evenly distributed nearby, the process is called plasticization. If this process is reached in the early years, it is called early plasticization. If it has not arrived yet, it is considered that there is no plasticization.

塑料包裝袋當然如今是二位包裝資料，其適用面還不如紙及紙板的包裝。但是塑料真空包裝業每年按5%的速度在打開，而其他塑料資料，包括紙及紙板，金屬，玻璃，陶砙，麻棉等只以2%的速度在添加。

Of course, plastic bags are now second-class packaging materials, and their applicability is not as good as paper and paperboard packaging. However, the plastic vacuum packaging industry is opening at a rate of 5% every year, while other plastic materials, including paper and paperboard, metal, glass, pottery, linen and cotton, are only added at a rate of 2%.

通常當我們去購買食物時，我們總會看到很多蔬菜都是用塑料袋封閉的。這是為了防止蔬菜腐爛。然后我們可以買一些蔬菜，買些蔬菜。

Usually when we buy food, we always see that many vegetables are sealed in plastic bags. This is to prevent vegetables from rotting. Then we can buy some vegetables, buy some vegetables.

保留剩余的蔬菜，以后再吃。如果天氣很冷，可以放一兩天，但夏天沒有冰箱。

Keep the remaining vegetables and eat them later. If the weather is very cold, you can put it for a day or two, but there is no refrigerator in summer.

此時，塑料袋可以派上用場。不要碰一些沒有吃過的蔬菜，然后用舊報紙將蔬菜包在塑料袋里。小心不要綁它們。塑料袋的主要特點是：

At this point, plastic bags can come in handy. Don't touch some vegetables you haven't eaten, and then wrap them in plastic bags with old newspapers. Be careful not to tie them. The main features of plastic bags are:

，密度小，比強度高，包裝成品率高，即每單位質量的包裝體積或包裝面積大小可以是二，大多數塑料袋具有良好的耐化學性，良好的耐酸性，耐堿性和各種溶劑。它們可以長時間放置而不會氧化。

First of all, the density is small, the specific strength is high, and the packaging yield is high, that is, the packaging volume or packaging area per unit mass can be two. Most plastic bags have good chemical resistance, good acid resistance, alkali resistance and various solvents. They can be stored for a long time without oxidation.

三，成型容易，所需的成型能耗低于鋼等金屬材料。

3、 It is easy to form, and the required forming energy consumption is lower than that of metal materials such as steel.

四，它具有良好的透明度，易于著色。

4、 It has good transparency and is easy to color.

五，具有良好的強度，單位重量強度高，耐沖擊，易于改性。

5、 It has good strength, high strength per unit weight, impact resistance and easy modification.

六，加工成本低。

6、 Low processing cost.

第七，絕緣性佳。

Seventh, good insulation.

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