The suction mouth bag does not wrinkle or leak, just do these three points

The proportion of suction bags in liquid packaging such as juices, sauces, toiletry products is increasing year by year, and it is gradually replacing plastic bottles and becoming the first choice in the market.

Compared with ordinary soft plastic packaging, the nozzle bag is more convenient and safe, compared with plastic bottles, the nozzle bag has a greater advantage in transportation costs and storage costs. Because it is a composite material, the self-standing composite bag can also be better customized according to the characteristics of the product, complete the diversification of packaging, more flexible, and more conducive to product promotion.

However, compared with ordinary flexible packaging, the production difficulty of the nozzle bag is relatively large, and there may be problems such as wrinkles and leakage at the sealing mouth if you are not careful. So how can you avoid this?

First, material selection

For liquid nozzle composite packaging bags, the material structure is generally polyester/New York/polyethylene,NY/PE, PET/AL/New York/polyethylene, etc., from which it can be found that most of the self-supporting nozzle composite packaging bags, the material structure fundamentally contains New York materials, so, in general, special attention should be paid to the selection of materials.

For products with large capacity and heavy weight, PET/PE is not suitable for use, because this composite method, although the price is low, but the toughness of the bag itself is not enough, easy to crack, which leads to the phenomenon of broken bag leakage. Of course, small and light packaging can be used in pet/pe construction.

Of course, the use of ny does not guarantee that there will be no problems at all, ny is only one of the influencing factors, and the specific bag type and capacity need to be considered.

Two, printing

1, the temperature and humidity of the printing workshop will affect the drying speed of the ink: too high humidity or too low humidity will speed up the drying speed of the ink, if the ink circulation is poor, the ink in the ink tank is easy to occur skin film, resulting in blocking.

2. Gravure equipment problems: If there are some problems in the design of gravure equipment organizations, such as the drum diameter is too large, the plate drum is immersed very shallow in the ink tank, etc., it will make the hot air leaking from the drying oven blow the plate layout directly, and then cause the ink to dry in the net hole, so that the layout is blocked. In addition to laundry detergent bags, the printing of various plastic flexible packaging should also be paid attention to, and it is necessary to pay more attention to the adverse effects of some details on the design, platemaking, printing, composite and bag-making factories.

3, ink drying speed: when the ink dries too fast, before transferring to the printing substrate there will be a part of the ink film, the poor solubility of the ink film will lead to poor ink transfer, through a period of accumulation will cause plate blocking.

Three, heat seal

1, heat sealing temperature. The factors that need to be considered when setting the heat sealing temperature are the characteristics of the heat sealing material; Second, the thickness of the film; The third is the number of hot sealing pressing and the size of the hot sealing area. Under normal circumstances, the same part of the press more times, the heat sealing temperature can be appropriately set lower.

2, heat sealing pressure. When heat sealing, appropriate pressure must be applied to promote the adhesion of the hot cover material. However, if the pressure is too large, the molten material will be extruded, which will not only affect the flatness fault analysis and elimination of the bag, but also affect the heat sealing effect of the bag and reduce the heat sealing strength.

3. Heat sealing time. In addition to the heat sealing temperature and heat sealing pressure, the heat sealing time is also related to the performance of the heat sealing material, heating method and other factors. The specific operation should be adjusted according to different equipment and materials in the actual test.

4. Heating method. The heating method of the hot sealing knife can be divided into two categories: unilateral heating and two side heating. Obviously, the two side heating method is more efficient and practical than the single side heating method.