About the requirement of composite material and bag-making technology for self - supporting bag suction nozzle
For "free-standing bag suction nozzle", the selection of materials is a key review of the product.
One, the choice of composite material
The requirement of the mechanical properties of the material is higher, so the multilayer composite film is generally used.
1. the outer
The outer layer is the printing material. At present, in addition to ordinary OPP, the commonly used vertical bag printing material in the market is also divided into PET, PA and other high-strength, high-barrier materials, which can be selected according to the situation.If used to package dried fruit solid products, you can choose BOPP, extinction BOPP and other common materials.If the packaging liquid products, generally choose PET or PA materials.
2. Middle layer
The intermediate layer generally chooses materials with high strength and high barrier, such as PET, PA, VMPET, aluminum foil and so on.And RFID, the surface tension of intermediate layer material to meet the composite requirements, must have a good affinity with the adhesive.
3.the inner layer
The inner layer is the heat sealing layer, generally choose PE or CPE, CPP and other materials with strong low temperature heat sealing performance.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 sealing.
Ii. Requirements for bag-making process
1.Heat sealing temperature
The factors to be considered when setting the heat seal temperature are the characteristics of the heat seal material;Second, the thickness of the film;The third is the hot sealing hot pressing times and the size of the hot sealing area.Under normal circumstances, the same part of the hot pressing times more, the temperature can be set lower.
2. Heat sealing pressure
Heat sealing must be applied to the appropriate pressure to promote the bonding of hot cover material.But if the pressure is too large, will make the molten material extrusion, not only affect the flatness of the bag fault analysis and troubleshooting, but also affect the bag thermal sealing effect, reduce the heat sealing strength.
3. Heat sealing time
The heat sealing time is not only related to the heat sealing temperature and pressure, but also related to the properties of the heat sealing material, heating mode and other factors.Specific operations should be adjusted according to different equipment and materials during the actual test.
4. Heating method
There are two types of heating methods for the hot sealing knife in bag making: unilateral heating and bilateral heating.Obviously, heating on both sides is more efficient and practical than heating on one side.Self-supporting bag suction pipe.
If you have real samples that will be perfectly customized to the product, it should usually be developed for new mold production, but different cavities, different outputs, and different joint costs, so if you have an idea of your mold requirements it will be better, otherwise, we need your order quantity to calculate the appropriate mold design.
