Why does the aluminum foil heat -stress -resistant strength is not good?aluminium spout pouch manufacture

　　Aluminum foil bags have the advantages of anti -static, moisture -proof, acid resistance, and good thermal sealing, and have been widely used in the food packaging industry. However, some manufacturers have received the problem of poor pressure resistance. What are the reasons for this problem? Can you avoid it? Packaging Co., Ltd. will bring you the answer.

　　1. Hot -seal raw materials

　　The types, thickness and quality of thermal raw materials affect the pressure resistance strength of the heat. The commonly used hot -sealing materials for aluminum foil bags include CPE, CPP, etc. These materials are different, and there will be differences in the pressure resistance strength of the bag. Generally speaking, the thickness of aluminum foil bags is 20-801um, and the special ones can increase with 100 to 200um for the same heat -sealed material. The strength is generally required to reach 40-50N/CM3, and the thickness of the heat sealed material should be above 60um or even 801um. If the thickness does not reach this range, it may lead to insufficient thermal pressure resistance.

　　In addition, the raw material is moisture, which will also cause the heat -blocking resistance to deterioration.

　　Second, thermal seal process

　　Insufficient refrigeration, not enough fixed -shaped, can not remove thermal stress, which will cause the heat -sealed compressiveness to deteriorate. At this time, it should be checked immediately to improve the cooling circulating water circulation. The spacing in the middle of the thermal seal and cooling knife is too long, which will also affect the heat -sealed pressure resistance effect.

　　For the composite membrane, pay attention to the peeling strength between the membrane and the membrane. Generally, the higher the peeling strength, the stronger the thermal pressure resistance capacity. Products with low separation interstitials often occur at the composite membrane at the weld seam, resulting in a greatly reduced thermal seal strength of the weld. As a result, if the intensity of the composite membrane layer is high, the seam will not be peeled at the seam, and the actual heat sealing strength will be much greater.

　　3. Printing ink

　　If the high temperature resistance of printing ink is poor, or the preservatives in the ink are not suitable, at the high temperature of the production of aluminum foil bags, the packaging printing layer will generate a declining layer, and the heating pressure resistance is reduced. At the same time, the choice of adhesive in the composite aluminum foil packaging is also important. The viscosity and ratio of adhesives are unreasonable, which will cause the aluminum foil packaging bag to be hot and compressive.

　　Packaging Co., Ltd. recommends that when printed aluminum foil packaging bags, choose high -temperature ink to resist high -temperature ink. It is best to use a two -liquid printing ink.

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