The difference between external vacuum packaging machine and internal vacuum packaging machine
The vacuum pumping method of the external vacuum packaging machine is very different from the internal pumping type. The internal pumping method is to vacuum the vacuum chamber, the vacuum chamber and the packaging bag are in a vacuum state at the same time, and the external pumping type is directly to the packaging bag. Vacuum. Due to the different pumping methods of the vacuum packaging machine , the application range and packaging effect will be changed.
External pumping | Internal pumping |
There is no requirement for the size and weight of the bag. | Restrict packaging size |
Cannot package liquid, powder, small particles | Can package a variety of products |
Vacuum is not too high | High vacuum |
Obviously see the packaging effect when working | Can't see the packaging effect when working |
External air supply required | No external air supply required |
Low efficiency, affected by operating processes | High efficiency and low requirements on the operation process |
Vacuum pump requires multiple maintenance | Vacuum pump maintenance is less frequent |
Can be heated on both sides, can be used as a sealing machine | Single-sided heating, can not be used as a sealing machine |
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Window Screen
In generally, the Window Screen including stainless steel window screen, aluminum window screen, alloy window screen, fiberglass window screen, etc .
The weave type is flat weaving.
Surface treatment of window screen: painted, glavanized, PVC, etc .
The window screen is generally used in hotels, public construction, civil buiding block of the mosquitoes and other insects.
Advantages of window screen :
light weight
good toughness
embroidery
ventilated good corrosion resistance
easy to clean
Window Screen,Aluminum Window Screen,Plastic Window Screen,Stainless Steel Window Screen,Stainless Steel Wire Mesh
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