Main differences of vacuum membrane press machine models of positive and negative pressures
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Main differences of vacuum membrane press machine models of positive and negative pressures

Views:2     Author:Site Editor     Publish Time: 2021-12-28      Origin:Site

What is the difference between a positive and negative pressure laminating machine and a negative pressure machine? What kind of process problems can you help users solve?


The difference between positive and negative pressure and negative pressure machine


Machine principle


The positive and negative pressure laminating machine, generally speaking, not only has a negative pressure (vacuum pressure) underneath, but also a positive pressure on the top. When the machine is operating, the bottom is pumped and the top pressure is pumped, not only is the bottom negative pressure vacuumed, but the top pressure is also added, so it becomes a positive and negative pressure. The negative pressure machine is only vacuumed from the bottom, and there is no pressure on the top, so it is called a negative pressure machine. Blister machine and negative pressure machine are different names of the same concept. Of course, the machine will not only pass the "pressing" step, but also have to cooperate with heating and other processes to become a complete laminating process.



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Finished effect


1) The three-dimensional effect of the workpieces made by the positive and negative pressure laminating machine will be relatively strong.


Because the negative pressure machine is only a negative pressure function, there is no pressure on it, and it can only be pulled down by air flow, so the three-dimensional sense of the corners, grooves and other positions of the workpiece after processing is not strong.




2) The products processed by positive and negative pressure can never peel off.


Because the temperature of the negative pressure machine can only be transferred to the surface of the workpiece, the temperature transmission of the side and groove is not comprehensive enough compared with the positive and negative pressure, so the relative adhesion will be relatively poor, and the product will easily fall after 2-3 years side. The positive and negative pressure is transmitted to every part of the workpiece through the positive pressure heating air flow. The air flow brings the temperature when it is pressurized, and the transmission is relatively in place, so that the workpiece is not easy to peel off.


3) Positive and negative pressure can make highlights.


Because the high-gloss film is relatively thick, generally 45 filaments, the temperature will be relatively high if it is made by a negative pressure machine. As a result, due to the high temperature, the high-gloss film will be too soft and it is easy to cause film burn (the film is deformed by heat, There are uneven chicken skin patterns on the surface), and the products produced in this way are unacceptable on the market. It is recommended that users who need to do highlight purchase positive and negative pressure. Positive and negative pressure do not need to be very high temperature. It will be pressurized at a uniform speed through an airflow of about 70 degrees, which can ensure the gloss, the softness of the film, and the glue. Adhesion.


4) So under what circumstances is it suitable to purchase a positive and negative pressure or negative pressure machine?


Mr. Xinjun Huang answered: “If the customer manufacturer locates a high-end route, it can purchase a positive and negative pressure laminating machine with requirements for three-dimensionality, gloss, etc., and if the project has just started, users in the trial stage can Consider purchasing a negative pressure machine. Generally speaking, the negative pressure machine is suitable for the transition period, and the positive and negative pressure laminating machine are basically the main ones.


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