Views: 4 Author: Site Editor Publish Time: 2022-05-24 Origin: Site
The differences between positive and negative pressure and negative pressure machine
The positive and negative pressure laminating machine, generally speaking, is not only a negative pressure (vacuum pressure) below, but also a positive pressure above. When the machine is running, the bottom is pumping the top pressure, not only the bottom negative pressure is vacuuming, but the top is also positive pressure, so it becomes positive and negative pressure. The negative pressure machine only vacuumizes 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 need to cooperate with processes such as heating to become a complete lamination process.
The three-dimensional effect of the water chestnut, concave-convex surface, groove surface, corners, etc. of the workpiece made by the positive and negative pressure laminating machine will be stronger. Because the negative pressure machine is only a negative pressure function, no pressure is added on it, and it can only be pulled down by the airflow, so the three-dimensional effect of the corners, grooves and other positions of the workpiece after processing is not strong.
The products processed by positive and negative pressure can achieve a long time without peeling. Because the temperature of the negative pressure machine can only be transmitted on the surface of the workpiece, the temperature of the sides and grooves 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 off 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, and the air flow will bring temperature when it is pressurized, and the transmission is in place, so that the workpiece is not easy to peel off.
Positive and negative pressure can do a good job of highlighting. Because the high-gloss film is relatively thick, generally 45 filaments, if it is made by a negative pressure machine, the temperature is relatively high. As a result, due to the high temperature, the high-gloss film will be softened too much, which is easy to cause film burning (the film is deformed by heat, There are uneven chicken skin patterns on the surface), and the products produced in this way are not acceptable on the market. Therefore, it is recommended that users who need to do highlights purchase positive and negative pressure. The positive and negative pressure does not require a high temperature. It will be pressurized at a constant speed through an airflow of about 70 degrees, which can ensure the gloss, the softening of the film, and the glue. Adhesion.
Under what circumstances is it suitable to purchase one model of positive and negative pressure or negative pressure one?
If the customer manufacturer is positioned on the high-end route, and has requirements on three-dimensionality, gloss, etc., a positive and negative pressure laminating machine can be purchased, and if the project has just started, users in the trial and exploration stage can consider purchasing a negative pressure machine. In general, the negative pressure machine is suitable for the transition period, and the positive and negative pressure laminating machine is basically the main one.