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Composite packaging materials for composite packaging materials

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for short-term circulation and consumption of yogurt, plastic packaging materials can be used for packaging. Plastic materials commonly used in yogurt packaging include monomer plastic materials and multilayer plastic composites (such as multilayer composite polyethylene materials). Yogurt packaged with plastic packaging materials belongs to one-time sales packaging, and generally needs to be stored and sold at low temperature. The common recommended storage temperatures include 2 ~ 4 ℃, 2 ~ 6 ℃, 2 ~ 8 ℃ and 0 ~ 4 ℃, among which the temperature range of 2 ~ 6 ℃ is the most common; The common recommended shelf life is 14 days, 16 days, 20 days, 24 days and 30 days, of which the most common is 14 days (generally stored at 2 ~ 6 ℃) and the less common is 30 days (generally stored at 0 ~ 4 ℃)
compared with paper materials, glass materials and metal materials, plastic materials have many advantages and characteristics, such as good transparency, good water and moisture resistance, good resistance (such as oil resistance, drug resistance and low temperature resistance), good processability and appropriate mechanical strength. At the same time, plastic materials are cheap and have a small proportion. Of course, plastic materials are inferior to glass materials in terms of corrosion resistance, metal materials in terms of mechanical strength and paper in terms of printability. However, as long as reasonable selection is made and combined with advanced plastic treatment and processing technology, plastic materials have broad application prospects in dairy products such as yogurt
plastic materials or plastic composites commonly used for packaging yogurt mainly include: ① polyethylene + titanium dioxide. Polyethylene film plays a certain role in improving the light blocking performance of white yoghurt packaging due to the opacity of polyethylene film in the production of yoghurt. ② Multilayer composite high density polyethylene material. Commonly used are three-layer high-density polyethylene (the middle layer is black high-density polyethylene containing carbon, the inner and outer layers are white high-density polyethylene containing titanium dioxide) and five-layer high-density polyethylene
the main packaging forms of yogurt packaging with plastic materials are bag type, bottle type and cup type, among which, The commonly used materials for bag packaging are polyethylene + titanium dioxide and multilayer composite high-density polyethylene. The commonly used materials for bottle packaging and cup packaging are polyethylene and polystyrene
when yogurt is packed in a flat bag, the printed sheet plastic film is generally installed at the packaging material supply part of the automatic filling machine to complete the bag making, filling and sealing operations in the packaging process. The sealing methods of the bag are mostly the middle sealing on the back and the sealing at both ends. The packaging cost of this packaging method is low, the packaging process and packaging technology are mature and easy to operate. Flat bags are generally designed and printed with simple decoration, and the patterns are continuous. Generally, it is necessary to ensure that there is a complete pattern on each bag
when yogurt is packed in flat bags, the capacity (packaging specification) of each bag is generally marked on the packaging bag with the net content of “how many grams” or “how many milliliters”, such as 125g, 227g, 250g, 125ml, 243ml, 250ml, etc. At the same time, in this form of packaging, multiple small bags (four bags, five bags, six bags, eight bags and ten bags are common) are often packed into a larger transparent plastic bag as a sales unit; Sometimes, some brands of yogurt have a series of flavors, such as original flavor, strawberry flavor, yam flavor, pumpkin flavor, peach flavor, apple flavor, litchi flavor, etc. in the collective packaging, small bags of yogurt with different flavors are often put into a large bag as a packaging unit or sales unit for packaging
three side sealed cylindrical bag packaging this kind of bag packaging is commonly used in the packaging of soybean milk and is more and more used in the packaging of yogurt. In the production process, the advanced “filling with inflation and pressure” process is adopted for filling, which is to align and heat seal the printed two sheet-like plastic films, first seal both sides longitudinally, then seal one end horizontally, and then seal one end of the bag mouth. The size of one end of the bag mouth is gradually reduced, and finally form a small mouth similar to the size of the straw. The bag shape is cylindrical, and a small incision is reserved at the mouth of the bag to facilitate tearing. When drinking, it can be drunk by gently tearing it from the incision. Generally, the packaging in this form is only for simple decoration printing, and the warning words such as “Beware of splashing” are printed at the opening (due to the filling process with pressure, the air pressure in the container is slightly higher than the atmospheric pressure, and the yogurt is easy to splash when opening)
yogurt is packed in cylindrical bags sealed on three sides, and its specification is usually 250g or 250ml per bag. At the same time, similar to the flat bag packaging of yogurt, this form of packaging often adopts the multi bag container of yogurt with the same taste, or the multi bag container of yogurt with different tastes to be packaged as a sales unit

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