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Analysis on the Causes of the Air Bubbles in the Gray Cardboard Composite Machine

Date:2021-04-26
Info:
 The bubble problem of the gray paperboard composite machine means that the two layers of film are n


  The bubble problem of the gray paperboard composite machine means that the two layers of film are not fully bonded, there is a gap between the composite finished film and the substrate, and there is gas. When the aluminum film is composited, it will produce pinpoint-like white spots. The essence is that the applied glue is not enough to fill the voids of the ink layer in the composite film and the pits on the surface of the material, which are also called bubbles. Bubbles are not necessarily bulging, but can also exist in other forms. As long as the two films are not fully bonded, there will be a difference in transparency, which will show what we often call "bubbles".

Composite Machine

  The main reason for bubble generation is that the type of composite substrate is different, and its physical properties are also very different (such as air permeability), which also has a great relationship with the formation of composite film bubbles. Generally speaking, between substrates with good air permeability (such as BOPP, CPP, CPE, LDPE) or between a composite substrate with poor air permeability (such as PVDC, BOPA) and another composite substrate with good air permeability , It is not easy to produce bubbles.

  If the air permeability of the two substrates is relatively poor, when they are compounded, it is easy to produce bubbles, such as the compound between PVDC and BOPA. This is because the air permeability of the two composite substrates is relatively poor, and the adhesive inevitably mixes a small amount of air into the gluing system of the composite unit.

  At the same time, in order to make the composite substrate have a certain surface tension, the surface properties of the substrate must be treated, such as corona treatment, to improve the wettability and roughness of the composite substrate surface, but the roughness exceeds At a certain limit, it is difficult to be filled with viscous glue. In this way, large and small bubbles are formed between these tiny meshing surfaces.


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Home / News / Industry News

Analysis on the Causes of the Air Bubbles in the Gray Cardboard Composite Machine


  The bubble problem of the gray paperboard composite machine means that the two layers of film are not fully bonded, there is a gap between the composite finished film and the substrate, and there is gas. When the aluminum film is composited, it will produce pinpoint-like white spots. The essence is that the applied glue is not enough to fill the voids of the ink layer in the composite film and the pits on the surface of the material, which are also called bubbles. Bubbles are not necessarily bulging, but can also exist in other forms. As long as the two films are not fully bonded, there will be a difference in transparency, which will show what we often call "bubbles".

Composite Machine

  The main reason for bubble generation is that the type of composite substrate is different, and its physical properties are also very different (such as air permeability), which also has a great relationship with the formation of composite film bubbles. Generally speaking, between substrates with good air permeability (such as BOPP, CPP, CPE, LDPE) or between a composite substrate with poor air permeability (such as PVDC, BOPA) and another composite substrate with good air permeability , It is not easy to produce bubbles.

  If the air permeability of the two substrates is relatively poor, when they are compounded, it is easy to produce bubbles, such as the compound between PVDC and BOPA. This is because the air permeability of the two composite substrates is relatively poor, and the adhesive inevitably mixes a small amount of air into the gluing system of the composite unit.

  At the same time, in order to make the composite substrate have a certain surface tension, the surface properties of the substrate must be treated, such as corona treatment, to improve the wettability and roughness of the composite substrate surface, but the roughness exceeds At a certain limit, it is difficult to be filled with viscous glue. In this way, large and small bubbles are formed between these tiny meshing surfaces.



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