Introduce several bag types of vacuum packaging bags and how to detect the appearanceThe main feature of the vacuum packaging bag is vacuum packaging, good sealing effect, not easy to break the bag and leak air, use the principle of atmospheric pressure to pump air and deoxidize, play a good role in anti-fouling, moisture-proof, prolonging the shelf life and keeping fresh, making it a The best of the pack. So what types of bags are there for vacuum packaging?1. Three-side-sealed bag type: three-side-sealed vacuum packaging bags are common in daily life. For example, the meat food vacuum packaging bags produced by our company are all three-side-sealed vacuum packaging bags. However, some have zippers, which can also be called self-sealing zipper vacuum packaging bags after adding zippers.2. Self-supporting zipper bag type: This type of packaging bag has a tray at the bottom and a bone strip on the head, which is reusable and easy to store. The tray can support the entire packaging bag to stand on the container. This kind of packaging The line of bags is beautiful.3. Middle-sealed organ bag type: There is no edge sealing on both sides of this bag type, so the pattern on the front of the package is guaranteed to be complete, which is more three-dimensional and beautiful.KWord pressing, edge sealing is firm.4. Special-shaped bag type: Special-shaped vacuum packaging bag refers to an unconventional aluminum foil bag, and the shape can be customized according to customer requirements.Appearance visual inspection includes the flatness of food composite bags, Transparency inspection and other items. It is mainly used to detect whether there are obvious scratches and pinholes on the performance of composite bags, and whether there is pollution on the seal, etc.. The appearance inspection method is as follows:①”Brushed bag surface”check. Place the food composite bag in the center of the hand, align40wThe fluorescent lamp shakes gently, and through the reflected light on the surface of the composite bag, you can clearly find whether there are scratches or marks on the surface of the composite bag, which is often called in the industry”Brushed bag surface”. Most of the wire drawing phenomenon is caused by the dirty guide rollers of the bag making machine, so it is necessary to ensure that the guide rollers are clean. In addition, if the guide roller does not rotate, it will also cause wire drawing failures in the composite bag.② Inspection of the flatness of the composite bag. Put the composite bag individually on a flat table. If the surface of the composite bag is curved, warped outward or arched inward, it means that the flatness of the composite bag is poor. Otherwise, it means that the flatness is good. The reasons for the poor flatness are generally as follows A few points: the bag making temperature is too high to destroy the stress stiffness of the inner layer of the composite bag; the structure is unreasonable; the thickness of the material itself is uneven.③ Transparency inspection. Some products have no patterns in large areas, so transparency is particularly important. The inspection method for transparency is: take a finished bag and observe it through the indoor indirect light source.”Pitting”,”Ring”,”foggy”And so on, it means that the transparency is poor, otherwise it means that the transparency is good.