What are the reasons for aluminum foil bags to leak during the bag making process? Many manufacturers sometimes leak seals during the production of aluminum foil bags. Sometimes the workers who collect the bags do not pay attention to the inspection, and a small number of leaky bags will be directly decorated.
Some bags are not used by customers during use. Sealing or no edge sealing occurs. In fact, sealing leakage often occurs during the bag making process. This phenomenon occurs in almost every manufacturer. How to pay attention to it? How to solve it?
- The heat sealing temperature of aluminum foil bagsis relatively insufficient: During the production process, changes in the thickness of the composite film are the main factors affecting changes in bag making and sealing parameters. For products from the same batch, assuming that the product thickness deviation is ±10% and the standard thickness of the composite film is 100um, the thickness of the composite film fluctuates between 100um and 120um, with a large deviation of up to 20um, which will give greater control over the sealing parameters. Come to question. Difficulty.
Sometimes, the previous film had a poor seal, but after switching to film, some of the seal leaks. This can also happen on the same roll of film. Because the thickness increases, that is, the process of heat conduction increases, in order for the heat shield to reach a similar temperature, it is necessary to increase the time or set a lower temperature. In addition, it affects the unevenness of pressure. Especially when the sides are thinner and the bottom is thinner, the temperature and pressure values should be set slightly toward the upper limit. Of course, first of all, the thickness deviation of the composite film must be controlled within the allowable range.
Check the seals for local leaks. A reliable method is to take samples at high temperature points within the temperature range, and to take samples at intervals so that the samples can fully cover all parts of the mold in the longitudinal and transverse directions.
- Aluminum foil bagproduction equipment and operation problems: If there are foreign objects in the heat sealing film, the heat sealing pressure is not enough, or the mold surface is not smooth, resulting in excessive local pressure, the temperature of different parts of the heat sealing mold may also be different. Different parts of the heat sealing mold can also have different temperatures. The temperature may also be different, the heat sealing mold is not installed parallel, etc.
- Problems with aluminum foil bag packaging materials: such as corona passing through the surface, excessive slip agent in the heat sealing layer causing improper heat sealing, etc.
- Structural leakage seals of aluminum foil bag production equipment: such as edge inserts, front seals, top pockets, and specific parts with sudden changes in thickness due to insufficient resin fusion. It is generally difficult to appear on the four layers of the back seal or the side seal of the side seal bag or the overlap of the top seal. Due to local thickening, there is less heat sealability. To avoid this phenomenon, increase the temperature and pressure or use local reinforcement. method to solve.