Eight edge sealing zipper bag with flat performance directly affects the quality of food.So, how to choose appropriate packaging, is often a lot of food manufacturers feel headache.General food manufacturers choose bags, often worry about eight edge-sealing bag with old material, lead to the quality of the bags do not pass.So, should we how to distinguish whether the food packaging bags with the old material?
Food manufacturers in the choose and buy or build bags, often can make merchants and manufacturers label, whether the food packaging materials production new material.Some food manufacturers in order to save costs, often take the initiative to request packaging manufacturer with old material production.And regular large food manufacturers, in order to guarantee the safety of food and improve the grade of the product, generally require manufacturer to make the bags with new material.Some unscrupulous manufacturers, it may be a little chasing profits, cheat customer, using mixed with some of the old material to produce bags.The packing bag of these bags and new material production looks the difference is very small.However, even if the appearance looks were similar, but we still have a way to distinguish.
The first: touch by hand.The packing bag of new material production to be smooth, soft and strong toughness;And old material production the packing bag of surface feels a sense of grain, dry and rough, feel is often harder, poor toughness, easy fracture;
The second: use to see.New material in the production of packaging color clear, do not contain impurities;The old material production the packing bag of sedimentation tend to take a little black color, light transmittance is poor;
The third: the nose to smell.New material production the packing bag of smell may take a little bit of glue flavour, but not bad;And old materials tend to produce the bags with a pungent smell.
With the above several methods, we can distinguish whether most of the bags with the old material.
1, two-way stretching polypropylene BOPP: with good printing performance, high transparency, tensile, cold resistant, heat resistant, and 40 degrees - 120 degrees;
2, two-way stretch polypropylene extinction film: the luminosity is small, translucent shape, film of extinction effect;With the support of bags has more texture and class;
3, cast polypropylene CPP: good gloss, good transparency, good heat sealing, its application is very extensive.But not hardy, CPP will be brittle under low temperature environment.The CPP stretch high temperature membrane is suitable for cooking packaging;
4, polyethylene PE: transparency, good gloss, heat sealing resistance, hardy.Also can according to need to be processed into various functional thin film, there are many kinds function.
5, PET polyester film, has good printing adaptability and resistance to tension, 60-150 degrees heat resistance, good air tightness, and suitable for cooking, no heat sealing;
6, nylon PA or NY: colorless, transparent and softness are higher than BOPP, cold resistant, heat resistant, oil resistant, but cooking.Easy to moisture absorption, no heat sealing;
7, aluminum foil, moistureproof, airtight, shading, abrasion resistance, incense, avirulent insipidity, etc.Aluminum foil with plastic and paper composite, the strength of the block of aluminum foil and paper, plastic heat sealing, necessary to further improved as packing material for steam, air, bacteria and ultraviolet shielding performance.With the aluminum foil packing material, at least can guarantee food more than one year is not bad.
Customized plastic Eight edge sealing zipper bag must know when plastic bags are made of more than a single material compound, such as compound OPP CPP, this combination is very suitable for small food packaging, its features are mainly high brightness, good transparency, printed, moistureproof, oxygen.Customized packaging need to know the character of the material can accurately find the packing bag of their products!