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抽真空包裝機是一種用于對產品進行真空密封包裝的機械設備，它的工作原理主要包括以下幾個步驟：

抽真空

：首先，將待包裝的產品放入已準備好的包裝袋中，然后通過真空泵將包裝袋內部的空氣抽出，形成真空環(huán)境。這一過程可以有效減少包裝內氧氣的存在，抑制微生物（如需氧菌）的生長繁殖，防止食品變質或氧化，并有助于減緩非食品產品的氧化和銹蝕。

封口

：在達到設定的真空度后，抽真空包裝機會通過熱封裝置對包裝袋進行封口處理，確保包裝內的真空狀態(tài)得以長久保持。

充氣（可選）

：某些真空包裝機還具備充氣功能，在抽空空氣之后，可以向包裝袋內充入惰性氣體，如氮氣，以進一步提供保護作用，比如抗壓、防碎或是維持食品的新鮮度等。

抽真空包裝機按照工作方式的不同，可分為內抽式和外抽式兩種類型：

內抽式真空包裝機

：被包裝物放置在真空室內完成抽真空和封口作業(yè)，適用于較小尺寸或較規(guī)則形狀的包裝物品。

外抽式真空包裝機

：適用于較大、較重或者形狀不規(guī)則的包裝物，其抽真空的過程是在包裝袋外部進行的。

抽真空包裝機廣泛應用于食品行業(yè)（如肉類、熟食、果蔬、茶葉等）、電子元件、化工產品、醫(yī)療器械等多種領域，用于延長產品保質期、保持產品質量和形態(tài)穩(wěn)定，以及提升運輸過程中的安全性。

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.