More beautiful bags, stand up!

People on the purchasing power of the FMCG continue to add, FMCG market with rapid development also led to the rise of flexible packaging industry. Now the type of packaging and use is very extensive, because good packing also can build high quality image of the product, the competitiveness of the industry product, and then promote the product sales. 1, classification and advantages of self-supporting bag self-reliance self-reliance bag packing garments self-supporting metal packaging bag family food packaging bag there are a lot of self-supporting bag packing of the products classification, assumed according to use classification, can be divided into: waterproof moisture-proof packaging, packing, mouldproof, modified atmosphere packaging, quick-frozen packing, breathable, microwave sterilization packaging, sterile packaging, plastic packaging, vacuum packaging, DNA packaging, blister packaging, packaging, stretch packaging, cooking bags, packaging, etc. The above all kinds of bags are made of different composite materials, the packaging features is corresponding to the requirements of different products, can effectively adhere to product quality and safe function. Self-supporting bag is considered to be classic modern packaging, also is a relatively new packaging method, marched in product level, strengthening the shelves visual effect, with the succinct, use convenient, waterproof and moistureproof prevent oxidation and sealing and so on many aspects has an advantage. Self-supporting bag on type can be divided into general and self-reliance bags, suction nozzle self-reliance bags, self-supporting zipper bags, imitation mouth self-reliance bags, special-shaped self-reliance bag five. First used in juice beverages, condiments, clothing accessories, hardware electronics, cleaning supplies, cosmetics and other products. Self-reliance bag packaging products for customers is very convenient, the plastic bags, so it has the quality of light, it is not easy to damage characteristic. Add zip/post other bone self-supporting bag can repeat use of suction nozzle self-supporting bag to make food more convenient pour out, exquisite printing products can help attract customer's attention. Generally self-supporting bag made by PET/FOIL/PET/PE laminated structure, also can have 2, 3 layers, and other specifications material. According to packing of different products, can add oxygen insulation cover according to the demand, reduced oxygen transmission rate, extended shelf life period of the product. General self-supporting bag and general method of self-supporting bag to choose four sealing side, not from a closed and repeated open; With a suction nozzle self-reliance bag more convenient dumping or cause contents, together to from a closed and repeated open, can think is a combination of self-supporting bag with general bottle; Imitation mouth self-reliance bag combines with a suction nozzle self-reliance bag cheap, convenience and general self-supporting bag by the shape of the body itself to complete the function of the suction nozzle bag, but self-supporting bag cannot repeat in imitation of a mouth sealing rev. ; Abnormity self-supporting bag is according to the demand of the product, on the basis of the traditional type bag change produced by the various shapes of new-style self-reliance bags, such as waist, deformation at the bottom of the planning, handle planning, etc. Second, self-supporting bag three common quality problems common specification 1, self-supporting bag self-reliance self-reliance bag bag leak leakage reason first lies in two aspects of composite material selection and heat sealing strength. 1. The choice of materials, self-supporting bag material selection is very important for leakproof, travel intention is outer and center barrier layer, barrier layer and heat sealing layer materials between peel strength and heat sealing strength of the bag. So the demand from the film on the surface of the composite surface tension is necessary more than 38 dyn/cm; The inner heat sealing film of low temperature heat sealing function better, the surface tension on the cover of the heat necessary less than 34 dyn/cm; Should choose connection function good ink, in addition, the high solid content and low viscosity adhesive, high purity of the organic solvent. 2. Heat sealing strength low heat sealing strength is one of the important elements of self-supporting bag leakage. To adjust heat sealing heat sealing temperature, heat sealing pressure and heat sealing time of the match. Especially watch out for bag heat sealing temperature, according to different structure for different kinds of plastic film melting point is different, heat sealing temperature is different; Heat sealing shoulds not be too great pressure, heat sealing time also shoulds not be too long, preventing macromolecular degradation, heat sealing layer under the high temperature molten state by heat sealing knife cut, make the seal strength decreased. In addition, four layers that accumulate self-supporting bag the bottom of the bag sealing is the most crucial parts, after the full test, can admit heat sealing temperature, heat sealing pressure and heat sealing time. In the process of produce practice, should be according to the different requirements of contents of self-supporting bag do leak test. The most useful method is briefly, the bag will be quantitative filling the air, the contents heat sealed, placed in water basin, different parts of the kneading by hand bag, without air bubbles escape, then the bag sealing excellence in sealing; Otherwise should timely adjust the flat parts of the heat sealing temperature and pressure. Built-in self-supporting bag of liquid to be treated with caution, more available kneading and drop method to detect whether the leakage, such as bag filling quantitative water, sealed mouth, according to GB/T1005 - 1998 overvoltage withstand test methods. Drop test method can refer to the same specification. Type 2, bag uneven flatness is one of the policy measure the appearance quality of the bag. In addition to the material elements, self-supporting bag of flatness and heat sealing temperature, heat sealing pressure, heat sealing elements such as time and cooling effect. Excessive heat sealing temperature or heat sealing pressure, heat sealing time is too long, can shorten deformation of composite membrane. Finalize the design shortage after cooling shortage would amount to a heat sealing, cannot eliminate the internal stress, make folding bag, so should adjust the process parameters, and to ensure that cooling water circulation system operation is normal. 3, poor symmetry, symmetry, not only influence the appearance of the self-supporting bag, will also affect the sealing function.
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