Today, Jiuzhi Plastics Network Xiaobian tells everyone about the classification of plastic bags , as follows:
First, according to the composite way to divide
According to the composite method: single-layer plastic bags and composite-grade plastic bags. Single-layer plastic packaging bags, mostly based on PE plastic film, also have heat-sealed BOPP.
Single layer plastic bag features:
1) the price is cheap;
2) Selecting the printing technology;
3) mostly use benzene soluble ink;
4) Because the ink is on the outer surface of the printing layer, the composite plastic packaging bag is printed relative to the gravure, and the color is simply faded;
5) Used in clothing packaging bags and general food packaging;
6) Belong to the low-end packaging.
Composite plastic bag features:
1) The price is relatively expensive compared to single-layer plastic bags;
2) Select mirror gravure;
3) Because of the implementation of benzene-free and ketone-free in China, there are increasing manufacturers choosing benzene-free ketone-free inks, but some manufacturers are still using benzene-soluble inks to reduce costs.
4) Because it uses gravure printing, the printing ink is located on the inner side of the printing layer, and then in the composite, so there will be no color discoloration due to conflicts, oxidation and other doubts. It is more durable than the single-layer plastic packaging.
5) Composite plastic packaging bags are widely used, food occupation, chemical occupation, daily necessities, etc., for their ingenious printing, and functional and day-enhanced, more and more widely used. 7) Attributed to high-end packaging.
Second, according to the packaging function
Three-layer packaging in composite bags: BOPP/PET/PE, BOPP/WMPET/PE, BOPP/PE can be used for most packaging, like brown sugar bags, seasoning bags, jujube bags, dried fruit bags, candy bars Packaging materials, roast chicken outer packaging bags, chicken leg outer packaging bags, and the like can be selected for most of the packaging materials. Other packaging materials can also be customized according to customer requirements.
There are also a lot of special bags:
1. For example, rice packaging bags, millet bags, seed bags, pet grain bags, if it exceeds 2kg, it is recommended to use BOPA/PE or PET/BOPA/PE. BOPA has strong tensile resistance and high It has oxygen barrier properties and is soft in texture.
2, high-temperature cooking packaging bags: including halogen egg packaging bags, roast chicken inner packaging bags, roast duck inner packaging bags, roast pigeon inner packaging bags, chicken legs inner packaging bags and other cooked food packaging bags, mostly use BOPA / RCPP selection, because BOPA and RCPP has high temperature resistance, and there is no doubt in the high temperature of 131 degrees, 30 minutes, 131 degrees, and 30 minutes of high temperature. There are also customers who use BOPA/AL/RCPP to express the level of packaged goods.
3, chemical commodity packaging bags: including pesticide packaging bags, chemical corrosive commodity packaging bags, mostly use PET / BOPA / AL / CPP, but because it uses anti-corrosion adhesive compound, and CPP is still a certain ventilation type, long-term use If the corrosive liquid passes through the CPP touch anti-corrosion glue, delamination may form. The company developed a new product, the inner seal layer is coated with anti-corrosion materials, can withstand a variety of corrosive liquids, and is glue-free, does not form delamination, widely used in pesticide packaging and various Corrosive liquid packaging.
4, washing products: washing powder packaging bags and laundry liquid stand-up bag nozzle bag, washing powder packaging bag is mainly BOPP / milky white PE, but also customers choose BOPP / PET / milky white PE.
Third, according to the classification of the bag
Self-supporting bags, self-supporting zipper bags, three-side zipper bags, self-supporting nozzle bags, and special-shaped bags are generally divided into three-side seals, back-sealed pillow-shaped bags, five-side seals, and middle-sealed bags.
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