1. Raw and auxiliary materials - raw aluminum foil is the carrier of the adhesive layer, and its quality has a deep impact on the heat sealing strength of the product. On the one hand, the surface oil stains on the original aluminum foil can weaken the adhesion between the adhesive and the original aluminum foil. Reusable Printing Bags，On the other hand, the heat sealing strength is also affected by the insufficient metal composition and surface gloss of the original aluminum foil. So it is necessary to strictly control the quality of the original aluminum foil.
2. Adhesive - Adhesive is a special substance containing a solvent, which is applied to the dark surface of the original aluminum foil under certain process conditions, and then dried in a drying oven to form an adhesive layer, which plays a decisive role in the heat sealing strength of the product.Soft packaging film,Composite bag,printed bags,Flexible packaging bags.
3. Production process - Under certain process parameter control, the adhesive is coated on the surface of the original aluminum foil to form a film, and the quality of the film directly affects the heat sealing strength of the product. One of the more important parameters is the coating speed. If the coating speed is too fast and the drying temperature is too high, it will cause the solvent on the surface of the coating to evaporate too quickly, resulting in residual solvent inside the film. The drying of the coating will not be sufficient, which will affect the heat sealing strength of the product.
4. Heat sealing temperature - Heat sealing temperature is an important factor affecting heat sealing strength. If the temperature is too high, the adhesion between the adhesive layer and the PVC film will not be firm. If the temperature is too high, it will also affect the medication. Therefore, a reasonable heat sealing temperature is generally between 150 ℃ and 160 ℃.
5. Heat sealing pressure - To achieve the desired heat sealing strength, a certain heat sealing pressure needs to be set. If the pressure is insufficient, the adhesive layer of the anti-static aluminum foil bag product cannot be fully bonded to the PVC film for heat sealing, thus failing to achieve a good heat sealing effect. So the national standard stipulates that the pressure for heat sealing is 0.20.2 × 10Pa.
6. Heat sealing time - Heat sealing time can also affect the heat sealing strength. In general, under the same heat sealing temperature and pressure, a longer heat sealing time can make the heat sealing part seal more firmly and perfectly. Can better achieve the expected heat sealing strength. If the heat sealing time is too short, it will result in insufficient heat sealing between the adhesive layer and the PVC film. Therefore, the national standard stipulates a scientific heat sealing time of 1 second.
7. Cooling process - attention should also be paid to the cooling process of anti-static aluminum foil bags after heat sealing. When the newly melted heat sealed weld seam is formed at a lower temperature, the heat sealing strength of the anti-static aluminum foil bag may decrease due to poor cooling, and the appearance of the weld seam may be affected, resulting in product failure. Poor cooling of general anti-static aluminum foil bags may be caused by insufficient heat sealing pressure, poor cooling water circulation, high water temperature, or untimely cooling.
Therefore, different packaging materials used in the production of anti-static aluminum foil bags require different heat sealing parameters in actual production. Too professional, I can't understand it! It's okay, Xingchen teaches you 2 tricks to prevent anti-static aluminum foil bags from cracking again.
① Adjust the heat sealing parameters effectively and reliably based on actual production needs and product packaging performance requirements. It should also be noted that other heat sealing parameters that can meet the standards are different under different heat sealing pressures, times, and temperatures. Adjustments should be made according to the actual situation to ensure the heat sealing strength and quality of anti-static aluminum foil bags.
② The products that need to be accommodated in anti-static aluminum foil bags can also affect the heat sealing strength of the aluminum foil bags. For example, when packaging fine powder products in aluminum foil bags, it is easy to stick the anti-static aluminum foil bag seal during packaging. At this point, it is necessary to adjust the packaging material and inner layer thickness of the anti-static aluminum foil bag according to the product being packaged, in order to ensure and improve the heat sealing strength of the anti-static aluminum foil bag.