Analysis of soft plastic materials for packaging o

2022-08-09
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Analysis of soft plastic materials for fast food packaging (II)

III. salt free nuts

the most common packaging forms of salt free nuts are glass cans, metal cans, spiral wound paper cans, soft plastic packaging bags, etc. When in use, the metal foil sealing cover can be stripped off, and then the HDPE plastic cover can be unscrewed. The HDPE plastic cover can be closed for many times to facilitate customers' consumption. The most widely used packaging structure in soft plastic packaging is bopp/pvdc/opp heat sealing film, and OPP heat sealing coating is used to heat seal bags. Walnuts, pecans and almonds are generally packaged with the above structure, which can have a shelf life of more than 1 year

IV. microwave processed popcorn

package the unexploded corn particles in a two-layer paper bag, seal them with polyvinyl alcohol glue, reserve a hole where water vapor can escape during the frying process, and heat them in the microwave oven to get popcorn. Corn particles can also be directly packed into a heat sealable pet bag. A piece of metallized PET film substrate at the bottom of the bag can be heated in the microwave oven. Because the microwave can heat and explode the corn particles through pet, and the metal layer of metallized pet will absorb the microwave and turn into infrared rays to reflect into the pet bag, thus improving the temperature in the pet bag during the corn frying process and shortening the frying time. Another packaging structure is that the outer layer is paper, the middle is PET film, and the inner layer is a special copolyester resin adhesive that can be heat sealed. This copolyester formula has a very low softening point. In the explosion of corn particles, it can almost all soften and be punched into pores by the steam in the bag

popcorn is usually put in heat sealable pet bags and then put into cartons for sale

v. candy packaging

candy is generally packaged in paper or waxed paper. Wide mouth bottles are often used in families to hold candy for easy access. Candy can be roughly divided into four categories: chocolate coated candy bars; Candy containing nuts; Small sized sugar granules coated with chocolate; Granulated sugar sold in the form of candy boxes

for candy packaging coated with chocolate, it is required to have high moisture resistance and oxygen resistance, good printability, lightproof and fast low-temperature heat sealing, so as to prevent candy from melting under heat. If nitrocellulose coated cellophane or PVDC coated cellophane is used, the shelf life can be extended. At present, the most widely used packaging structure is: varnish/ink/white bopp/pvdc/cold sealing. Varnish can protect printing ink; Printed on the surface of white corona treated BOPP film, it has shading property. BOPP also has good printability, high strength and good bending resistance; PVDC has good resistance. Jinan assaying hydraulic universal experimental machine is relatively simple to operate and has air humidity resistance; Cold sealing can be sealed at a temperature lower than the melting point of chocolate. The cold sealing materials are mostly natural rubber and water-based latex like slurry. Its sealing performance is particularly effective in cellophane packaging of candy and similar packaging structures combined with PVDC. The cost of this packaging structure is only 30% - 50% of the cost of NC coated cellophane, and the shelf life can be as long as 1 year

for candies containing nuts, because nuts contain more natural oily substances and are particularly sensitive to oil deterioration, packaging materials are required to have high oxygen resistance. Their structures are mostly: varnish/ink/vm Fujian down 40 yuan/ton alpet/binder/opp/pvdc/cold sealing, and the shelf life can exceed 9 months

VI. therefore, the jaw should be cleaned frequently, and the packaging of instant noodles

most instant noodles contain oil, so the manufacturers should add corresponding control systems to their moisture resistance and oxygen resistance. The commonly used packaging structure is: vacuum molding with expandable PS foam, and the outer layer is glued aluminum foil, which can be heat sealed with the bowl surface, and then wrapped with heat shrinkable film. For instant noodles with low oil content, the package with bopp/cpp structure is generally acceptable. The oil package in instant noodles must be resistant to high temperature cooking, and its structure is mostly pet/pa6/cpp

VII. Fruit packaging

the so-called fruit usually includes the following four categories of food: chocolate, biscuits, candy and gum. The main performance requirement of these four kinds of food packaging is moisture resistance. The packaging materials used mainly include polyolefin film, PA, pet, Eval, aluminum foil and vacuum aluminum coating. PVDC coating film and aluminum foil composite film have good moisture resistance and gas resistance

the packaging materials used for blocky chocolate are mostly aluminum foil and plastic coated paper strips; The packaging of chocolate fast food and chocolate bars mostly adopts PVDC coating film; Biscuit packaging bags mostly use composite film; Bagged candy mostly adopts film (kink packaging), composite film and PVDC coating film

to sum up, the packaging technology of fast food is first of all to meet the premise of food safety, and gradually updated with the development of packaging materials and packaging processing machinery. With the development of science and technology, the continuous improvement of people's living standards and the improvement of food quality system, the soft plastic packaging of fast food will flourish in the direction of more convenient, safer, beautiful, clean, hygienic and environmental protection

source: Printing Technology

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