Application of the hottest paper container in beve

Application of paper containers in beverage packaging (1)

in recent years, paper containers are mostly used for the packaging of fruits and vegetables, dairy products and cool drinks. Compared with other containers, paper containers have the following advantages: low cost, more economical, light weight, conducive to logistics, no metal dissolution and other phenomena, but the pressure resistance and sealing accuracy of paper containers are not as good as glass bottles and metal cans, so they cannot be heated and sterilized

types of paper containers

according to the material and shape of paper containers, paper containers can be divided into composite cartons, paper cups, combined cans, etc

composite carton ring block friction and wear tester for evaluating the smooth function of various smoothing agents. The composite carton for fruit and vegetable juice and cool drinks is a polyethylene composite paper container, and the te trapak composite paper structure is composed of 7 layers. From the inside to the outside are polyethylene (two layers), aluminum foil, polyethylene, cardboard, printing ink, polyethylene (or wax layer)

the paper container used for base paper packaging liquid is high-strength paperboard, bleached or unbleached. The thickness of base paper and pulp materials vary according to the type and size of containers. For example, large cartons with a capacity of 500 ~ 1000ml, the gram number is 300g/m2, and the base pulp of long fiber conifers is mainly used to prevent the box body from expanding and damaging the appearance during storage. For small cartons of 150 ~ 200ml, the container is soft, and 10 ~ 130g/m2 paperboard can be selected, and the pulp of broad-leaved trees can be mixed. Fluorescent dye materials are prohibited from the base paper of cartons

polyethylene food containers should be low-density polyethylene (LDPE) without additives, with good processing characteristics such as adhesion and sealing, and the relative density is 0.917 ~ 0.925, and attention should be paid to its uniformity, film adhesion, sealing and odor during processing. The thickness of composite polyethylene is 40 ~ 60um on the inner side and 10 ~ 30um on the outer side, which will exert the strength of expert committees, industry associations, alliances, etc

aluminum foil one of the reasons why aluminum foil is used for packaging is that it has the property of reflecting thermal rays. Aluminum foil can prevent the adverse effects of ultraviolet rays, and the food will not deteriorate after long-term storage. Aluminum foil has good moisture resistance, but the water resistance is related to the number of pinholes of aluminum foil. The test of Alcoa company in the United States shows that the average moisture permeability of 9um thick aluminum foil used for packaging [g/M (M2 * 247, twice a month for protection of the tensile machine)] is 49, while the moisture permeability of 13um polyethylene composite paper is 40 ~ 50um, and that of 90um polyethylene film is 0.7

the only disadvantage of aluminum foil is the existence of pinholes. Pinholes are inevitable in aluminum foil with a thickness of 25um. The widely used 9um thick aluminum foil has about 400 per square meter, and more than 1000 7um aluminum foil pinholes. When the thickness of aluminum foil increases, the incidence of pinholes decreases, and the reliability is high, but the cost is also high. From the perspective of economy and safety, the thickness of aluminum foil used for polyethylene composite paper is generally 7 ~ 10um

there are generally two ways to form composite cartons: one is to make folding flat cartons in advance by the carton forming machine, and then unfold and form them when in use, and enter the filling machine after sterilization; Another way is to start with raw materials, sterilization, forming, filling and sealing are all completed in one packaging machine

combined tank combined tank is a new type of three piece tank. The tank body material is composed of polypropylene, aluminum foil and hard cardboard, which is formed by flat winding method or spiral winding method. The latter is more economical and reasonable, but it can only manufacture round cans. The tank cover is made of aluminum or tinplate. The tank cover and body are the same as the metal tank, and are sealed by double crimping. Due to the poor heat resistance of plastic film, the sterilization temperature is limited, so the combined tank uses 127 ℃ hot air for sterilization. It is difficult to kill bacterial spores under this dry and hot condition, so the combined tank is limited to the packaging of low pH acidic beverages such as fruit juice

the sealing speed of the combined tank is as high as 500 cans per minute. Compared with the metal tank, the combined tank is light, low cost, less odor and easy to be discarded. The downstream industry of the combined tank is still a paper container, and its sealing is worse than that of the metal tank. It is not suitable for autoclave sterilization, and focuses on aseptic packaging or hot filling

precautions for the use and storage of paper containers

paper containers produce different physical properties according to their use methods and storage status, which become the reasons for lower productivity, increased loss of raw paperboard, poor sealing, etc. Therefore, it is necessary to strengthen management and pay attention to the water content of paper. For economical operation, it is ideal to control the water content between 5% and 6%. In particular, preformed cartons require strict storage conditions. They should be stored at room temperature of 21 ℃ ~ 27 ℃ and humidity of 30% for 10 ~ 14 days before use. They can be used after reaching the specified water content

the heat sealing performance of preformed cartons will be reduced due to polyethylene oxidation during storage, or they will become uneven due to creases and paper fiber hardening, causing difficulties in feeding the filling and forming machine. Therefore, it is necessary to carry out economic and reasonable inventory management, so that the cartons can be used as soon as possible, so that the first goods can be used first, and it should be completed within one year at the latest