Plastic container for food packing container
Single layer plastic film bag: the commonly used plastic varieties are high pressure polyethylene (low density polyethylene), low pressure polyethylene (HDPE), polypropylene, polyvinylidene chloride, etc. two. High pressure polyethylene film water resisting, softness and good low temperature resistance, and has the oxygen and carbon dioxide gas through the larger, which is suitable for the packaging of hygroscopic solid food, liquid food and frozen food, especially suitable for fresh vegetables, fruits and other packaging can maintain its "physiological respiration process, and keep the water caused by dry shrinkage metamorphism. But the high pressure polyethylene is poor in heat resistance, can not be heated, bactericidal temperature, and is not resistant to oil, low strength, so there is a certain limit in the application. Low pressure polyethylene is capable of over 100 degrees of thermal sterilization temperature and is resistant to grease. Therefore, the range of application is greater than that of high pressure polyethylene. Polypropylene film has excellent gas and moisture insulation, oil resistance, high transparency, smooth surface, can heat sterilization temperature above 100 DEG C, and can be made thinner and directional packaging films have high strength but low temperature resistance is poor, so it can be used for other food in the frozen food packaging. Poly two vinyl chloride generally made of biaxially oriented films, large thermal shrinkage and excellent gas barrier properties, which has high transparency, good elasticity, high strength, oil resistance and other properties, suitable for vacuum packaging, shrink packaging and frozen food packaging.
By single or composite materials by blow molding, vacuum, extrusion, injection molding method made of plastic bottles, cups, trays and plastic containers: to adapt to a variety of drinks, fast food and frozen food packaging. As for PET bottles, beverage bottles and PVC PP bottles, transparent appearance, light and strong features for fast food; polypropylene disc has the characteristics of heat resistance, sterilization temperature, which can contain jam, fruit and vegetable food heat sterilization; frozen food packaging is widely used in polyolefin plastic cup.
Composite film bag: made of different kinds of plastic film or laminated with plastic film and paper and aluminum foil. According to the use and requirements, it can be made of two layers, three or more kinds of composite film bags. Such as polyethylene - polyester, cellophane - polyvinylidene chloride, polyethylene two - polyethylene, paper, polyester - aluminum foil - polyolefin, polyethylene - aluminum foil - paper - polyethylene - polyamide film bags. By hot lamination, coating, adhesive, CO extrusion method for processing and preparing, with special adhesive between layers. One of the typical representatives of composite film bags is a retort pouch for high temperature sterilization. It has excellent isolation, can long-term preservation of food, not deterioration, there are soft canned. The composite material is based on polyester aluminum foil polyolefin. The composite film bag can also be applied to aseptic packaging process, and the full-automatic production line of container forming, food filling and sealing can be successfully realized by using composite material. The recently emerging boxes, bags and barrels are the first aseptic packaging containers developed in the United Kingdom for packaging liquid and mushy foods, such as wines, juices, ketchup, etc.. The packing bag is made of plastic and aluminum foil, and the volume is 5, 20, 200, 220 and 1000 liters. Filling under aseptic conditions, into the corrugated box (5 ~ 200 liters bag) or wooden box (1000 liter bag), called the box into the bag; if the drums (220 liters), it is called barrel bag. Its common feature is convenient storage and transportation.
