Steamable molding - loading - sealed bags in the packaging industry has great potential for development, packaging materials generally use 1/2 cellophane / low density polyethylene / aluminum foil / low density polyethylene four-layer laminated structure. Metallized polyesters also have good barrier properties and UV resistance comparable to aluminum foil laminates.
For products that are difficult to contain, such as iodine is easily infiltrated, the laminated material of the package is delaminated or the aluminum foil is corroded. Many packers are researching and applying the outer layer of aluminum foil, the middle layer of heat-insulating polyester, and the inner layer has 2-8 layers of mil. Rubber-modified high-density polyethylene, used to package sterile saline, can be placed in a retorting tank and heated.
The liquid and semi-fluid foods packaged by the molding-loading-seal bag are ketchup, jam, butter, milk, butter, fruit juice, beef juice and coffee cream etc.; medicines and daily necessities have medical ointment, disinfectant water, Alcohol, detergent, bleach, shampoo, antifreeze, motor oil, etc.
The liquid-filled bags must be dispensed and disposed after they are opened, and a zippered bag originally sold in the market is expensive. Now Sweden's Knorroff Company has produced a molding-loading-sealing bag with a metering valve that allows the liquid and semi-fluid in the bag to flow out in a certain dose. The injection-molded polypropylene valve is heat-sealed in polyethylene. The bag is also fitted with a screwable cover. This form-fitting-sealing bag is now sold in Europe and costs less than the original zipper bag.
3. Hot-melt hard-paper trays In order to save fuel, the United States has used aluminum instead of steel to make automobiles, and the demand for aluminum has increased substantially. As a result, the price of aluminum-foil food trays has increased, which has promoted the improvement and promotion of hot-bakable paper trays. Now in the convenience food market, foods packaged in hard paper trays have largely replaced aluminum foil foods and can compete with aluminum foil discs in terms of price.
The heat-resisting paperboard is made from solid bleached Sulfate Paper (SBS) or milk board. The thickness of the paperboard ranges from 0.48-0.11cm. The coating is usually made of poly terephthalate, but also polyethylene, polypropylene and acrylic paint and white clay paint. The coating was applied to the paperboard by melt extrusion. The temperature of cardboard and paint must be carefully controlled. The quality of the finished product mainly depends on the effect of the extrusion method.
Cardboard temperature, coating temperature and machine operating temperature largely determine the maximum temperature that the board can withstand in the furnace and the crack resistance of the board. If the coating breaks, the cardboard will absorb the juice in the food. Therefore, extrusion is a critical process.
The extrusion method is more difficult to control, and the extrusion methods adopted by various board manufacturers are not the same. For example, the international paper company uses a white clay coating, and the building boards are first coated with white clay and then coated with extrusion. Olin Kraft uses acrylic paints and uses a three-stage method of knife coating on a paper machine. The finished product is cheaper than the two-step process.
The use of inks and adhesives for the logo printing and conversion process, offset printing, and photolithographic printing, must be able to withstand both the low temperature of the refrigerator and the temperature of the oven. The withstand temperature range is 232-288T. The furnace temperature of ordinary furnaces is usually higher than the oven temperature of the microwave oven, but the cardboard itself rarely reaches or exceeds 121-1350C because the temperature of the food in the cardboard tray is low.
There are currently three methods for making packaging trays from heat-stable cardboard: Pressing, punching into the lip, and sealing in a straight line on two folding angle machines. The board can be made into a variety of packaging styles, such as pie trays, folding cardboard boxes, and small platters.
For products that are difficult to contain, such as iodine is easily infiltrated, the laminated material of the package is delaminated or the aluminum foil is corroded. Many packers are researching and applying the outer layer of aluminum foil, the middle layer of heat-insulating polyester, and the inner layer has 2-8 layers of mil. Rubber-modified high-density polyethylene, used to package sterile saline, can be placed in a retorting tank and heated.
The liquid and semi-fluid foods packaged by the molding-loading-seal bag are ketchup, jam, butter, milk, butter, fruit juice, beef juice and coffee cream etc.; medicines and daily necessities have medical ointment, disinfectant water, Alcohol, detergent, bleach, shampoo, antifreeze, motor oil, etc.
The liquid-filled bags must be dispensed and disposed after they are opened, and a zippered bag originally sold in the market is expensive. Now Sweden's Knorroff Company has produced a molding-loading-sealing bag with a metering valve that allows the liquid and semi-fluid in the bag to flow out in a certain dose. The injection-molded polypropylene valve is heat-sealed in polyethylene. The bag is also fitted with a screwable cover. This form-fitting-sealing bag is now sold in Europe and costs less than the original zipper bag.
3. Hot-melt hard-paper trays In order to save fuel, the United States has used aluminum instead of steel to make automobiles, and the demand for aluminum has increased substantially. As a result, the price of aluminum-foil food trays has increased, which has promoted the improvement and promotion of hot-bakable paper trays. Now in the convenience food market, foods packaged in hard paper trays have largely replaced aluminum foil foods and can compete with aluminum foil discs in terms of price.
The heat-resisting paperboard is made from solid bleached Sulfate Paper (SBS) or milk board. The thickness of the paperboard ranges from 0.48-0.11cm. The coating is usually made of poly terephthalate, but also polyethylene, polypropylene and acrylic paint and white clay paint. The coating was applied to the paperboard by melt extrusion. The temperature of cardboard and paint must be carefully controlled. The quality of the finished product mainly depends on the effect of the extrusion method.
Cardboard temperature, coating temperature and machine operating temperature largely determine the maximum temperature that the board can withstand in the furnace and the crack resistance of the board. If the coating breaks, the cardboard will absorb the juice in the food. Therefore, extrusion is a critical process.
The extrusion method is more difficult to control, and the extrusion methods adopted by various board manufacturers are not the same. For example, the international paper company uses a white clay coating, and the building boards are first coated with white clay and then coated with extrusion. Olin Kraft uses acrylic paints and uses a three-stage method of knife coating on a paper machine. The finished product is cheaper than the two-step process.
The use of inks and adhesives for the logo printing and conversion process, offset printing, and photolithographic printing, must be able to withstand both the low temperature of the refrigerator and the temperature of the oven. The withstand temperature range is 232-288T. The furnace temperature of ordinary furnaces is usually higher than the oven temperature of the microwave oven, but the cardboard itself rarely reaches or exceeds 121-1350C because the temperature of the food in the cardboard tray is low.
There are currently three methods for making packaging trays from heat-stable cardboard: Pressing, punching into the lip, and sealing in a straight line on two folding angle machines. The board can be made into a variety of packaging styles, such as pie trays, folding cardboard boxes, and small platters.
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