How to choose clothing packaging bags, this article explains it thoroughly!

Good packaging can explode the entire marketing field, and it will also make a little-known brand become a well-known dark horse in a while, and can firmly grasp the hearts of users. How to choose clothing packaging bags so that we can create our own explosive products and let our brand be deeply rooted in the hearts of users? Professional flexible packaging manufacturer——Packaging (www.), today combined with the composite process of packaging bags to interpret for you how to choose clothing packaging bags. ​1. Selection of composite substrates The composite substrate is the primary factor for selecting the properties of the composite film. The choice of the composite substrate depends on the requirements of the packaging, the use of the composite material and the properties of the single-layer film. In addition, the cost of the material should also be considered, and a scientific, accurate and reasonable selection should be made to satisfy the different packaging contents. need. The characteristics of composite plastics are the primary factors for selecting the properties of composite films. The selection of composite film base materials mainly depends on the following primary factors: 1. The properties of the composite film; 2. The properties of the contents; 3. The properties of the single-layer film 4. Appropriate price of product packaging, etc. According to the above factors, the appropriate lamination method and number of adhesive layers of composite packaging materials are selected. 2. The characteristics of commonly used plastic films are different for the packaging contents of different packaging materials. For example, the basic requirements of general food packaging for composite plastic films are: non-toxic, odor-free, and non-polluting the contents of the bag; excellent air tightness, heat sealing, moisture resistance, UV resistance, heat and cold resistance properties, chemical resistance, etc.; the outer layer of the composite packaging material should have excellent heat resistance, and it is not easy to be scratched, sanded, and has better printing and optical properties; the middle layer of the composite packaging material should have good barrier properties and light-proof properties The inner layer of the composite packaging material should have excellent heat sealing, odorless, non-toxic, oil resistance, water resistance, chemical resistance and other functions. 3. Composite type Common composite types are: paper/plastic composite, plastic/plastic composite, aluminum/plastic composite, etc. The number of composite substrate layers can be two, three, four, five or even more. According to the variety and thickness of the composite plastic film substrate, the number and order of the combined layers, and the method of compounding, many varieties of plastic composite flexible packaging can be formed. For example: the two layers are composed of: polystyrene/polyethylene, polypropylene/polyethylene, polyester/polyethylene, polyester/unstretched polypropylene, nylon/polyethylene. Three layers are composed of: polyethylene/polypropylene/polyethylene, polyester/polypropylene/polyethylene, biaxially oriented polypropylene/polyvinylidene chloride/polyethylene, polyethylene/polyvinyl alcohol/polyethylene, biaxial Stretch polypropylene/polyvinyl alcohol/polyethylene, nylon/polyvinyl alcohol/polyethylene, nylon/ionomer/polyethylene, polyester/polyvinyl alcohol/polyethylene. The composition of more than four layers is: polypropylene/polyethylene/nylon/polyethylene, polyester/polyethylene/nylon/polyethylene, polyethylene/polypropylene/polyvinylidene chloride/polypropylene/polyethylene, ionomer polymerization material/polyethylene/polyvinylidene chloride/polyethylene/ionomer. Fourth, the specific application 1. BOPP-containing composite film BOPP is a commonly used food packaging material. The characteristics of BOPP are: 1. Colorless, transparent, and extremely glossy, comparable to cellophane, widely used in food, medicine and Industrial material packaging, BOPP is the most commonly used packaging exterior material. 2. Excellent cold resistance and heat resistance, can be used between -40°C∽120°C, commonly used temperature is 20°C∽50°C, excellent tensile strength, impact strength and stiffness, and barrier properties are much better than CPP, often It can be used to make refreshing snacks, hygroscopic biscuits, ice cream, flowers, candy, especially cigarette packaging. It can also be manufactured in large packaging bags, which can be used for many strapping belts; 3. The function of blocking water vapor is very good, but the oxygen barrier is slightly Poor; generally used as high-transparency waste bags, composite bags and printing materials. 4. Compared with unstretched PP, the mechanical strength is high, but the elongation, air permeability and moisture permeability decrease, and the permeability of organic reagent vapor decreases to varying degrees; 5. The single-layer film cannot be directly heat-sealed , but can be coated with adhesive or other plastic film composite in the sealing part to improve its heat sealing. Various factors should be considered in the selection of adhesives for flexible food packaging. Generally speaking, as a composite adhesive, the following requirements should be met: ①No peculiar smell and no toxicity; ②No harmful extracts appear after packaging food; ③Applicable temperature requirements for food storage; ④ Good weather resistance, no yellowing and foaming, no chalking and delamination; ⑤ oil, essence, vinegar and alcohol resistance; ⑥ no corrosion of printing image ink, and has a high affinity for ink. Other softness, operability, stickiness persistence, medium corrosion resistance and hygienic safety cannot be ignored. For example, in terms of medium corrosion resistance, food contains salt, acid, spicy, spice, alcohol, water, sugar, fatty acid, etc., which have different characteristics. It is very likely that it will enter the adhesive layer through the inner layer of the composite film, causing corrosion damage. effect, resulting in delamination, splitting and failure of the packaging bag. To this end, the adhesive must have the ability to resist the corrosion of the above substances, and always maintain a satisfactory adhesion and peel strength.
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