Laser technology is applied to the production of easy-tear lines of flexible packaging, which avoids the embarrassment of the whole tearing or the leakage of the contents when the package is opened, and makes the application of flexible packaging more convenient. This technology has been widely used in Europe and America, and has also been developed and recognized in China, and its prospects are very optimistic.
Flexible packaging sometimes uses circular easy-to-tear or shaped tears, such as beverage bags. In order to facilitate the user's use, a circular easy-to-tear opening with an easy-to-insert straw is designed on the upper part of the bag. The user can use a pointed straw to easily insert the beverage into the bag at the round hole.
The traditional bag-making technology is to punch out the round hole on the composite film first, and place a thin film with a width greater than the diameter of the round hole at the round hole in the bag when making the bag, and then use a round sealing knife to round the round hole. The outside of the hole is heat-sealed, and the round hole is sealed with a film, and the user inserts the film with a straw to insert the bag. This processing method is complicated in process and has a high scrap rate. It will also make it difficult to heat seal the edge of the bag, which may cause leakage.
Working principle of laser cutting system:
If the laser is used to cut the round and easy to tear, the process is simpler, the cost is reduced, and the quality is greatly improved. The laser cutting system controls the laser output power of the computer and the scanning movement of the galvanometer. It can cut any graphics and characters designed by the computer on the film at a high speed, with a maximum speed of 300 characters per second (identifiable).
If it is easy to tear with a diameter of 5.5mm, it only takes about 0.1s. The system can be installed on the bag making machine and cut when the bag making machine is heat sealed. After installing the marking software system, under the control of the color mark sensor, the system can also be installed on the slitting machine, which can accurately position the round easy-to-tear or any graphics during the movement.
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