Innovation and improvement of the hottest packagin

Innovation and improvement of packaging technology

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. Use of polyolefin containers. From hairdressing and beauty cosmetics to household and industrial scale removers, drugs, liquids and dry foods, almost every consumer goods market is covered. 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 (F.F.S bag for short)

forming loading sealing bag plays an important role in modern packaging. It is a product integrating packaging design, materials and machines. It can produce effective packaging to meet the needs of modern loading and unloading and sales parties, including stars, starlight, Xingyao, Xingdou, Xingshang and other types

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). Each bag of 226.8g (8 ounces) of vertical machine is recycled at 25r/min (packaging 100 bags/min). However, about 800 million tons of the more advanced packages belong to Unapproved unconventional projects; The production capacity of discontinued coal mines is 308 million tons of packaging materials, such as polyester ＼ aluminum foil ＼ polypropylene laminated thin steamable bags, usually cannot be packaged at such a high production rate

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 of mixing in the bag - loading - sealing bag is separated with a breakable film to separate the food that needs to be matched together. 3. Maintenance for the control system: packaging, adding water or other ingredients 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 materials generally compete with the 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 is easy to penetrate, which makes the laminated material of the package delamination or corrodes the aluminum foil, many packers are studying the application of the outer aluminum. As long as the outer aluminum is 1 Q Jinan native foil, the middle layer is heat-insulating polyester, and the inner layer is 2-8 layers of rubber modified high-density polyethylene, which is used to package the sterile brine, and the bags can be placed in the distillation tank for heating

liquid and semi liquid foods packaged in shaped packed sealed bags include ketchup, jam, cream, milk, butter, fruit juice, beef juice and coffee cream; 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 opening. In recent years, a bag with zipper has been sold, but the cost is high. Now the Swedish Knopf company produces a kind of 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 press tight cover. Now this kind of forming - loading - sealing bag has been sold in Europe

3. In order to save fuel, the United States has used aluminum instead of steel to make cars. The supply and demand of aluminum has increased significantly, which has increased the price of aluminum foil food trays, thus promoting the improvement and promotion of furnace heated hard paper 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 to 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, extrusion method 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, photolithography or printing should be applied. The inks and adhesives must be able to withstand the low temperature of the refrigerator and the temperature of the ordinary furnace. The tolerance temperature range is 232 ~ 288 ℃. The temperature of ordinary oven is usually higher than that of microwave oven, but the cardboard itself rarely reaches or exceeds 121 ~ 135 ℃, because the food in the cardboard tray provides a lot of cooling

there are three methods to make packaging plates from heated cardboard: pressing, stamping into lips, and sealing on two folding angle machines along a straight line. This kind of cardboard can form various packaging forms, such as cake making plates, folding cardboard boxes and small shallow plates