Selection of high barrier packaging composite structure

Products that contain grease and have a long shelf life require high barrier packaging, and high barrier objects are primarily oxygen.

The discoloration of food, the formation of brown pigment, occurs when an amino compound coexists with a compound containing a carbonyl group. Fat oxidation produces carbonyl compounds, fats are placed in the air: due to the infiltration of oxygen will gradually change, resulting in aldehydes or ketones (represented in the carbonyl compounds are 1. aldehydes or ketones, 2. carboxylic acid derivatives), That is, rancidity occurs, and at the same time, an oxygen atom bridges the polymer to increase the viscosity and the specific gravity. The toxicity of spoiled fast food noodles is also caused by the oxidation of oil after oxidation.

Some products also need to block ultraviolet rays. If the oil under the light will produce acid, resulting in deterioration of the product, damaged flavor.

Sunlight can also discolor prints and merchandise. In addition, sunlight can promote oxidation of oils and fats. Some people think that the role of ultraviolet light in the foot of the sun, it was also considered that the short-wavelength visible light 325-400 nm has the greatest effect on the oxidation of the oil. The color of this band in the light is purple, and the human eye can only see the purple light above 380 nm. When the light is strong, it can feel the wavelength of 350 nm after adaptation, so it is the band between visible light and invisible light. For another example, alkaloids in medicine. Vitamins B1, B2, vitamin C, etc., also react with oxygen very quickly due to the action of light, resulting in various changes such as discoloration and decrease in content. The above-mentioned effect of light is determined by the amount of light irradiation (intensity*exposure time), and the intensity of direct light is 263 times that of indoor light. Therefore, when the product is stored in a room for three months, it is equivalent to direct light irradiation for four hours.

(1) YH2000S aluminum foil should be used for the aluminum foil (AL) structure of Nestle milk powder bag structure (lightproof, oxygen barrier), PET/AL/PET/PE (400-500g), PET/AL/PE, PET/VMPET/PE The special aluminum plating film (vMPET) uses YH501S, YH50IVM and YH501SL aluminum plating adhesives.

(2) Puffed food packaging Extruded foods generally contain more oil, but the shelf life is short. The structure can be used: BOPP/VMCPP and filled with carbon dioxide or nitrogen sterilization to extend the shelf life. Due to the high peel strength required, special aluminum plating adhesives must be used.

(3) Transparent vacuum packaging and transparent boiled bag The purpose of vacuum is to extract oxygen and slow the speed of bacterial growth. The best oxygen permeability in transparent film is nylon. The purpose of boiled is to substantially kill bacteria, which can also slow the rate of bacterial proliferation. Then prevent the oxygen in the environment from entering the package to extend shelf life. Commonly used structure: BOPA/PE.

(4) High-temperature cooking packaging The packaging has high barrier properties and the goods are sterilized at high temperatures, which can extend the shelf life of the product to the maximum. This kind of packaging is all aluminum/plastic structure: PET/AI/CPP, PET/AI/NY/CPP high-temperature cooking bag can choose Komatsu YH502, YH502S and YH3166.