抽真空包装机是一种用于对产品进行真空密封包装的机械设备，它的工作原理主要包括以下几个步骤：

抽真空

：首先，将待包装的产品放入已准备好的包装袋中，然后通过真空泵将包装袋内部的空气抽出，形成真空环境。这一过程可以有效减少包装内氧气的存在，抑制微生物（如需氧菌）的生长繁殖，防止食品变质或氧化，并有助于减缓非食品产品的氧化和锈蚀。

封口

：在达到设定的真空度后，抽真空包装机会通过热封装置对包装袋进行封口处理，确保包装内的真空状态得以长久保持。

充气（可选）

：某些真空包装机还具备充气功能，在抽空空气之后，可以向包装袋内充入惰性气体，如氮气，以进一步提供保护作用，比如抗压、防碎或是维持食品的新鲜度等。

抽真空包装机按照工作方式的不同，可分为内抽式和外抽式两种类型：

内抽式真空包装机

：被包装物放置在真空室内完成抽真空和封口作业，适用于较小尺寸或较规则形状的包装物品。

外抽式真空包装机

：适用于较大、较重或者形状不规则的包装物，其抽真空的过程是在包装袋外部进行的。

抽真空包装机广泛应用于食品行业（如肉类、熟食、果蔬、茶叶等）、电子元件、化工产品、医疗器械等多种领域，用于延长产品保质期、保持产品质量和形态稳定，以及提升运输过程中的安全性。

Vacuum packaging machine is a kind of mechanical equipment used to vacuum seal packaging products, and its working principle mainly includes the following steps:

Vacuuming

First, the product to be packaged is put into the prepared bag, and then the air inside the bag is pumped out by a vacuum pump to form a vacuum environment. This process can effectively reduce the presence of oxygen in the packaging, inhibit the growth and reproduction of microorganisms (if needed), prevent food spoilage or oxidation, and help slow down oxidation and rust of non-food products.

heal

After the set vacuum level is reached, the vacuum packaging machine seals the bag through the heat sealing device to ensure that the vacuum state in the package can be maintained for a long time.

Inflatable (optional)

Some vacuum packaging machines also have an inflatable function, which can be filled with an inert gas, such as nitrogen, after the air has been evacuated, to further provide protection, such as resistance to pressure, shatter resistance or to maintain the freshness of the food.

According to the different working methods, the vacuum packaging machine can be divided into two types: internal pumping type and external pumping type:

Internal vacuum packaging machine

: The packaged items are placed in the vacuum chamber to complete the evacuation and sealing operations, which is suitable for smaller sizes or regular shapes of packaged items.

External vacuum packaging machine

: It is suitable for large, heavy or irregularly shaped packaging, where the vacuuming process is carried out on the outside of the bag.

Vacuum packaging machines are widely used in the food industry (such as meat, cooked food, fruits and vegetables, tea, etc.), electronic components, chemical products, medical equipment and other fields, used to extend the shelf life of products, maintain product quality and form stability, and improve safety during transportation.