With the widespread application of automatic packaging film, the attention to automatic packaging film is increasing. Below are 10 problems encountered by automatic packaging film when making bags：
1. Uneven tension
Uneven tension in film rolls is usually manifested as the inner layer being too tight and the outer layer being loose. If this type of film roll is used on an automatic packaging machine, it will cause uncertain operation of the packaging machine, resulting in uneven bag size, film pulling deviation, excessive edge sealing deviation, and other phenomena, leading to packaging products that do not meet quality requirements. Therefore, it is recommended to return film roll products with such defects. The uneven tension of the film roll is mainly caused by the uneven tension between the in roll and out roll during slitting. Although most film roll slitting machines currently have tension control devices to ensure the quality of film roll slitting, sometimes the problem of uneven tension in slitting film rolls still occurs due to various factors such as operational reasons, equipment reasons, and large differences in the size and weight of the incoming and outgoing rolls. Therefore, it is necessary to carefully inspect and adjust the equipment to ensure balanced cutting tension of the film roll.
2.Uneven end face
Usually, the end face of the packing film roll requires smoothness and unevenness. If the unevenness exceeds 2mm, it will be judged as a non-conforming product and usually rejected. Film rolls with uneven end faces can also cause unstable operation of automatic packaging machines, film pulling deviation, and excessive edge sealing deviation. The main reasons for the unevenness of the end face of the film roll are: unstable operation of the slitting equipment, uneven film thickness, uneven tension in and out of the roll, etc., which can be checked and adjusted accordingly.
3. Wave surface
Wavy surface refers to the uneven and wavy surface of a film roll. This quality defect will also directly affect the operational performance of the film roll on the automatic packaging machine, and affect the quality of the final packaged product, such as the tensile performance of the packaging material, decreased sealing strength, printed patterns, deformation of the formed bag, etc. If such quality defects are very obvious, such film rolls cannot be used on automatic packaging machines.
4. Excessive cutting deviation
Usually, it is required to control the slitting deviation of the rolled film within 2-3 mm. Excessive slitting deviation can affect the overall effect of the formed bag, such as pattern position deviation, incompleteness, asymmetric formed bag, etc.
5. Poor quality of joints
The quality of joints generally refers to the requirements for the quantity, quality, and labeling of joints. Generally, the requirement for the number of film roll joints is that 90% of the film roll joints have less than 1, and 10% of the film roll joints have less than 2. When the diameter of the film roll is greater than 900mm, the requirement for the number of joints is that 90% of the film roll joints are less than 3, and 10% of the film roll joints can be between 4-5. The film roll joint should be flat, smooth, and firm, without overlapping or overlapping. The joint position should preferably be in the middle of the two patterns, and the adhesive tape should not be too thick, otherwise it will cause film jamming, film breakage, and shutdown, affecting the normal operation of the automatic packaging machine. Moreover, there should be clear markings at the joints for easy inspection, operation, and handling.
6. Core deformation
The deformation of the core will cause the film roll to be unable to be installed properly on the film roll fixture of the automatic packaging machine. The main reasons for the deformation of the core of the film roll are damage to the core during storage and transportation, crushing of the core due to excessive tension in the film roll, poor quality and low strength of the core. For film rolls with deformed cores, they usually need to be returned to the supplier for rewinding and core replacement.
7. Wrong film roll direction
Most automatic packaging machines have certain requirements for the direction of the film roll, such as whether it is bottom first or top first, which mainly depends on the structure of the packaging machine and the design of the packaging product decoration pattern. If the direction of the film roll is incorrect, it needs to be rewound. Usually, users have clear requirements in the film roll quality standards, and under normal circumstances, such issues are rare.
8. Insufficient bag making quantity
Usually, film rolls are measured in length, such as kilometers per roll, and the specific value mainly depends on the maximum outer diameter and load capacity of the film roll applicable to the packaging machine. Both the supply and demand sides are concerned about the quantity of film roll bags, and most users need to assess the consumption index of film rolls. In addition, there is no good method for accurate measurement and inspection of film rolls during delivery and acceptance. Therefore, insufficient bag making quantity often causes disputes between both parties, which usually need to be resolved through negotiation.
9. Product damage
Product damage often occurs from the completion of slitting to delivery, mainly including film roll damage (such as scratches, tears, holes), plastic film roll contamination, outer packaging damage (damage, water damage, contamination), etc.
10. Incomplete product labeling
The film roll should have clear and complete product labeling, which mainly includes: product name, specifications, packaging quantity, order number, production date, quality, and supplier information. This is mainly to meet the needs of delivery acceptance, storage and shipment, production use, quality tracking, etc., and to avoid incorrect delivery and use.
Post time: Dec-25-2024