• Categories:Industry News
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• Time of issue:2022-01-12
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(Summary description)Self-supporting nozzle bag is composed of two parts: suction nozzle and self-supporting bag. It is a flexible packaging bag with a horizontal support structure at the bottom and a suction nozzle on the top or side. Its production requirements are relatively high. If it is not mastered well, unqualified products will appear, and problems such as bag swelling, bag breakage, and leakage will occur during use. The production and production of self-supporting nozzle packaging bags are mainly divided into design, plate making, printing, compounding, curing, slitting, bag making, and these steps. In this issue, we mainly talk about the parts that need to be paid attention to in compounding and bag making.

First, the choice of composite materials

1. Outer layer: The outer layer is the printing material. At present, the commonly used stand-up pouch printing materials on the market are not only ordinary OPP, but also high-strength and high-barrier materials such as PET and PA. For packaging dry fruit solid products, common materials such as BOPP and matte BOPP can be used; for packaging liquid products, PET or PA materials are generally used.

2. Intermediate layer: The intermediate layer generally chooses high-strength and high-barrier materials, and the surface tension of the intermediate layer material is required to meet the composite requirements, and must have a good affinity with the adhesive, so PET, PA, VMPET, Aluminum foil and other materials.

3. Inner layer: The inner layer is the heat-sealing layer, which is generally made of materials with strong low-temperature heat-sealing properties such as PE, CPE, and CPP. The surface tension of the composite surface is required to meet the composite requirements, but the surface tension of the hot cover must be lower than 34mN/m, and it must have good anti-pollution ability, anti-static ability and heat-sealability.
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2. Requirements for bag making process

1. Heat-sealing temperature: The factors to be considered when setting the heat-sealing temperature are: one is the characteristics of the heat-sealing material; the other is the thickness of the film; the third is the number of times of heat-sealing and pressing and the size of the heat-sealing area. Under normal circumstances, when there are many times of ironing on the same part, the heat sealing temperature can be appropriately set lower.

2. Heat sealing pressure: Appropriate pressure must be applied during heat sealing to promote the adhesion of the heat cover material. However, the force must be controlled well. If the pressure is too large, the molten material will be extruded, which will affect the flatness of the bag and the heat-sealing effect of the bag, thereby reducing the heat-sealing strength.

3. Heating method: The heating method of the heat sealing knife can be divided into two categories: one-side heating and two-side heating. The heating method on both sides is more efficient and practical than the heating method on one side.
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The problems in the actual production of self-supporting nozzle bags are mainly in these two aspects. Therefore, how to choose materials well and adopt the best process operation method plays a decisive role in improving the overall quality of self-supporting nozzle bags. .