The bag making process usually has several main functions, including material feeding, sealing, cutting and bag coding.
1. In the feeding part, the flexible packaging film fed by the roller is unrolled through a feeding roller. Feed rollers are used to move the film within the machine to perform the required operations. Feeding is usually an intermittent operation, and other operations such as sealing, cutting, etc. are performed during feeding stops. Dancing rollers are used to maintain constant tension on the film roll. To maintain tension and critical feeding accuracy, feeders and dancing rollers are necessary.
2. In the sealing section, a temperature-controlled sealing element is moved into contact with the membrane for a specific length of time in order to properly seal the material. Sealing temperature and sealing duration vary depending on the material type and need to be kept constant at different machine speeds. The sealing element configuration and associated machine format depends on the type of seal specified by the bag design. In most machine operating modes, the sealing process is accompanied by the cutting process, and both operations are performed when the feed is completed.
3. During cutting and bagging operations, operations such as sealing are usually performed during the non-feeding cycle of the machine. Similar to the sealing process, the cutting and bagging operations also determine the optimal machine configuration. In addition to these basic functions, the execution of additional operations such as zippers, perforated bags, totes, tamper-resistant seals, bag spouts, crown treatments, etc. may depend on the design of the bag. Accessories connected to the base machine perform these additional operations.
