Independent food sack to three common quality problems, you are worth a look!

A leakage self-reliance, self-reliance food packaging bags, food bags leak reason mainly lies in two aspects of composite material selection and heat sealing strength. 1. Food sack of standing on your choice of materials: materials selection is very important for the containment, the purpose is to improve the outer and middle blocking layer, barrier layer and heat sealing material between the peel strength and heat sealing strength of the bag. So the demand from the film on the surface of the composite surface tension must be greater than 38 dyn/cm; The inner heat sealing film of low temperature heat sealing performance is better, the surface tension on the cover of the heat must be less than 34 dyn/cm; In addition, should choose to connect good ink performance, high solid content and low viscosity adhesive, high purity of the organic solvent. 2. Heat sealing strength, low heat sealing strength is also one of the important factors that affect independent food bags leak. To adjust heat sealing heat sealing temperature, heat sealing pressure and heat sealing time matching relation between. Especially pay attention to grope for the bag heat sealing temperature, different structure for different kinds of plastic film melting point, heat sealing temperature is different; Heat sealing shoulds not be too great pressure, heat sealing time also shoulds not be too long, lest macromolecular degradation, heat sealing layer under the high temperature molten state by heat sealing knife cut, make the seal strength decreased. Second, self-reliance of food packaging bag type problem of uneven flatness is one of the indicators to measure the appearance quality of the bag. In addition to the material factors, self-sustaining food sack of roughness and heat sealing temperature, heat sealing pressure, heat sealing time and cooling effect and other factors. Excessive heat sealing temperature or heat sealing pressure, heat sealing time is too long, can cause composite film contraction deformation. Insufficient cooling will cause heat sealing after finalize the design, can't eliminate the internal stress, make the bags and wrinkled, so should adjust the process parameters, and to ensure that cooling water circulation system working properly. Three, self-reliance food sack poor symmetry problem not only influence the appearance of the self-sustaining food sack, symmetry can also affect the sealing performance. Self-sustaining food sack one of the most common asymmetry is often reflected in the base part, due to improper base tension control, will cause the deformation of bottom hole or fold and high tension does not match, heat sealing strength reduced. When the base hole deformation occurs, to decrease the feeding tension, and increase the waiting time when heat sealing modification, so that the bag four layers where sufficient heat sealing. In addition, the bag type asymmetric with photoelectric tracking, feeding, design of the cursor, rubber roller balance, stepper motor or servo motor synchronization and other factors. This problem according to different products and bag making equipment in the specific operation.
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