Innovation of the hottest food packaging container

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Innovation of food packaging containers

since the 1980s, due to the development of the plastic industry, the use of plastic containers to package goods has increased a lot compared with 10 years ago. With the popularity of new foods such as quick-frozen foods and convenience foods in the market, there have been many innovative or transformed packaging forms, among which the packaging bags and heatable hard paper trays produced by the application of molding loading sealing equipment are the most successful

1. plastic bottles

the following three production methods are mainly adopted for bottles produced in the United States: extrusion blow molding, pressure injection blow molding and biaxial directional molding. In Western Europe and Japan, in addition to the above three methods, CO extrusion and rotary fusion are also used

the most commonly used blow molding resins are low-density polyethylene and high-density polyethylene, polyvinyl chloride, polypropylene, polyethylene terephthalate, polystyrene, styrene acrylonitrile, nitrile polymer and polycarbonate. Polyolefin (high density polyethylene and polypropylene) and polyvinyl chloride have become the main packaging materials in the market. Polyolefin containers have significantly increased the number of people who bring their own shopping bags and baskets. From hairdressing and beauty cosmetics to household and industrial scale removers, drugs, liquids and dry foods, they have been used in almost every consumer goods market. At present, the United States sells 500 million tons of polyolefin resin every year for the manufacture of blow molded containers

PVC, nitrile polymer and polyester have better overall resistance to oxygen, carbon dioxide and water than other resin containers. Polyester is the only clean food container resin approved by the U.S. Food and drug administration. Through orientation, polyester containers have been used to hold inflatable beverages, food and drugs

2. forming loading sealing bag (hereinafter referred to as F-F-S bag)

forming loading sealing bag plays an important role in modern packaging. It is a product that integrates packaging design, materials and machines. It can produce effective packaging to meet the needs of modern loading, unloading and sales methods

all production processes of the forming loading sealing equipment are automated. Bags are formed from raw materials (single-layer or multi-layer fibers and laminated materials), output bags from the cutting table of the machine, send the bags to the conveyor, transfer them to the packaging area, heat seal them after loading, and then count, inspect and pack them. A vertical molding - loading - sealing machine with half an ounce of ketchup in each bag runs about 60 cycles per minute (packaging 600 bags/min). The vertical machine with 226.8g (8 ounces) per bag circulates at 25R/min (packaging 100 bags/min). However, more advanced packaging materials, such as polyester, aluminum foil and polypropylene laminated steamable bags, are usually unable to be packaged at such a high production speed

this packaging method is suitable for small packaging, with accurate weight control. It can be mixed in the bag and steamed in the bag. It is easy to open. The molding - loading - sealing bag mixed in the bag is separated by a breakable film, and the food that needs to be matched together is separated and packaged, and water or other ingredients are added when eating. This saves freezing and reduces bulk or shipping weight

the steamable forming loading sealing bag has great development potential in the packaging industry. The packaging material generally adopts a four-layer laminated structure of 1/2 cellophane/low-density polyethylene/aluminum foil/low-density polyethylene. Metallized polyester also has good insulation performance, and its UV resistance is comparable to that of aluminum foil laminates

for products that are difficult to contain, such as iodine, which is easy to penetrate, so that the laminated material of the package is delaminated or corrodes the aluminum foil, many packers are studying the application of the outer aluminum foil, the middle layer of heat-insulating polyester, and the inner layer of rubber modified high-density polyethylene with a layer of mils, which can be used to package the sterile salt water, and can be heated in the distillation tank with bags

the liquid and semi liquid foods packed in forming - loading - sealing bags include ketchup, jam, cream, milk, butter, fruit juice, beef juice and coffee cream, so the mold steel should be made of corrosion-resistant materials; Drugs and daily necessities include medical ointment, disinfectant, alcohol, detergent, bleach, shampoo, antifreeze and motor oil

the bag containing liquid must be distributed and disposed of after it is opened. The original bag with zipper sold in the market has a higher cost. Now the Swedish Knopf company has produced a forming - loading - sealing bag with metering valve, which can make the liquid and semi fluid in the bag flow out in a certain amount. The molded polypropylene valve is heat sealed on the polyethylene bag, and is also equipped with a screwable cover. Now this kind of forming - loading - sealing bag has been sold in Europe, and the cost is lower than the original zipper bag

3. heatable cardboard trays

in order to save fuel, the United States has used aluminum instead of steel to make cars, and the demand for aluminum has increased significantly, which has increased the price of aluminum foil food trays, thus promoting the improvement and promotion of heatable cardboard trays. Now in the convenience food market, foods packaged in hard paper trays have largely replaced aluminum foil dishes, and they can also compete with aluminum foil dishes in price

the paper board that can be heated in the oven adopts solid bleached sulfuric acid paper board (SBS for short) or milk paper board. The thickness of paperboard ranges from 0.48-0.11cm. The coating is usually poly (phthalate), and polyethylene, polypropylene, acrylic paint and clay paint are also used. The coating is applied to the paperboard by melt extrusion. The temperature of cardboard and paint must be carefully controlled. The quality of finished products mainly depends on the effect of extrusion method

paperboard temperature, coating temperature and machine operating temperature determine to a large extent the maximum temperature that the paperboard can withstand on the furnace and the crack resistance of the paperboard. If the coating breaks, the cardboard will absorb the juice in the food. Therefore, one of the most easily damaged parts of the electronic universal experimental machine is the electromechanical pressing method, which is a key process

the extrusion method is difficult to control, and the extrusion methods adopted by various paperboard manufacturers are also different. For example, the international paper company uses clay coating, and the board is first coated with clay, and then extruded. Aolin kraft paper company uses acrylic paint and adopts the three-stage method of coating with a knife on the paper machine. The price of the finished product is cheaper than that processed by two-step process

inks and adhesives should be used in the process of engraving and printing logo and transformation. Offset printing and photolithography should be applied. The inks and adhesives must be able to withstand both the low temperature of the refrigerator and the temperature of the ordinary furnace. The withstand temperature range is 232-288t. The temperature of ordinary oven is usually higher than that of microwave oven, but the cardboard itself rarely reaches or exceeds 121-1350c, because the food temperature in the cardboard tray is low

at present, there are three methods to make packaging plates from heated cardboard: pressing, stamping into lips, crossing two folding angles along a straight line. 2. Sealing on the maintenance machine of the electronic universal experimental machine. This kind of cardboard can be made into various packaging styles, such as cake making plates, folding cardboard boxes and small shallow plates

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