News classificationNews

Contact usContact us

1.jpg

Address: Lianxi Boulevard(M. Section), Jiujiang, Jiangxi, China

Phone: 0792-8352828    

            0792-8352066

Fax: 0792-8352666

Mail: jjyixin@jjyixin.cn

URL: www.jx-yixin.com

Website:www.canmakingmachine.net


Your current location: home >> News >> Industry News

Situation and development of the food packaging container

Release date:2009-07-18 Author: Click:

1505474216862642.jpg

The more material civilization advances, the more packaging containers, production was also more beautiful. From the development of the food packaging container, but also a glimpse of form and quality of human life is how evolution.


Five or six years old or new friends have experienced changes of China's economic development and material life, so often I like to tell the younger generation how life was in those days because of the pain, fearing young people do not understand how they are growing from a friend in need . Growing up in hardship who often some "old" problems, some elderly people see trash filled containers such as bottles and jars, often could not understand, complain, said: "I remember when I was a kid, if We are able to see a little trash cans, long grab by picking up a few hair enchant change, which will be like the modern so lucky, so wasted. "indeed, in the era of material life, the more difficult, food packaging containers, although rough , but it is rare and precious.


Ancient times, when people need to dress food containers, usually from nature to find gourds, bamboo knot, curly leaves of large or large shells. Later, gradually with the use of natural resources, container processing, such as hollowed wood, woven straw baskets, and even the use of animal organs such as the stomach or horn and leather container. About eight thousand years ago, humans began to know how to make pottery, can be used to dress food, storing food, even cooked food. Then, pottery mainstream food packaging containers. To three thousand years ago, evolved from a ceramic glaze glass come out, and gradually developed into a container. However, industrial production of glass containers is nearly two hundred years before appearing.


On the other hand, about two thousand years ago, when the Eastern Han Dynasty in China, Cai Lun invented paper, used for packaging food gradually. In the development of metal container, may be traced back to the Bronze Age, our ancestors learned to use a metal material container containing food. However, metal cans packaged food, so food can be stored for a long time, then the start about two hundred years ago in the UK. As for the current account in the most important position in the food packaging plastic packaging materials is the youngest category, in the nineteenth century was budding, and 50 to 60 years ago, they began to develop into a mainstream material for food packaging containers.


First, the status of traditional food containers


In today's highly developed material civilization, food packaging has become a ubiquitous and indispensable in the life of the product. A variety of beautifully crafted, eye-catching appearance of packaged foods on display at the various store shelves, varied, often dazzling, careful observation of these packaging materials, nothing more than plastic, metal, glass and paper into four categories. Of course, some materials are bonded four composite material, food packaging containers such diversified.


1, plastic containers


The rise of plastic packaging materials and change people's lifestyles are closely related. Due to the high population growth, increasing pressure on the food shortage, how to make use of economic lightweight packaging to facilitate storage and transportation of food, and increase the shelf life of food, becomes very important. The plastic packaging material just to meet these needs.


Plastic packaging materials which have exactly the nature makes them so easy to use? In general, due to the low density of plastic, they are much lighter weight than metal or glass, or in the processing of relatively light use. Plastic has a strong toughness, not so easy to break the glass, easy recessed cans when not under pressure, but also not as easy to tear the paper. Many plastic materials are easily molded, they can make it soften slightly heated, giving it a certain shape, as long as the temperature is lowered after you can stereotypes. We often see the plumber when connected plastic pipes, baking slightly heated with a flame what you can soften the plastic pipe, made of any of a variety of shapes.


Many plastics when exposed to heat fusible, making it easy to seal. In many stores you can see the clerk put food into a plastic bag, with a heat sealer can seal a pressure on the bag is very convenient. Further, it is important that the technology now makes plastic packaging materials have good barrier properties, either steam or oxygen through the plastic container is not easy, it is possible to extend the storage time.


Plastics are all joined by a number of so-called "monomer", a polymer polymerized material. 5000-100000 molecular weight around. Some plastic is composed of one or more monomers to form a so-called polymer, and can have the special properties thereof. Commonly used in food packaging containers many types of plastic, including polyethylene, polypropylene, polyvinyl chloride, polystyrene and the like, are different nature.


On the demand for food packaging containers, the most important properties include the degree of toughness, permeability, vapor permeability, heat sealing, and heat resistance. In order to produce in line with the special needs of plastic packaging materials, will sometimes different materials are bonded together so-called composite film, and the overall nature of the packaging material more in line with demand.


2, metal containers


The use of metal cans for food packaging is a simple and effective way to preserve food. Two metals commonly used in the canning of tinplate and aluminum. Tinplate body is a thin steel plate. The steel sheet was placed in molten tin, tin-plated energizing the so-called tinplate made on a thin steel plate. In order to improve the corrosion resistance of tinplate, it heat treatments, the produced tin layer between the tin-iron alloy layer and the steel sheet; and then forming a chromium compound of chromium on the tin oxide layer, tin is not easily oxidized and deteriorated. Finally, in order to lubricate the surface of tinplate, making it easy to form in the manufacture of canned food, and prevent rust, and coated with a thin layer of oil.


Thus, seemingly simple tin cans fact, the structure is not so simple. To further prevent food ingredients cause corrosion of the tank wall, often coated with a layer of paint tin. According to the characteristics of food, once or twice a painting painted. Coatings are polymer component, such as an epoxy resin, acrylic resin, polyester resin and the like. After painting usually takes roasted cured.


Aluminum is a metal having good ductility. Since a thin film of aluminum oxide in contact with air after aluminum it is easy to form on the surface, so it has good corrosion resistance. But this layer of aluminum oxide film met halogen ions (such as salt chloride ions) are vulnerable to damage, so in practice still needs a coating layer of a polymer film to avoid the erosion of food ingredients.


Metal cans is a good sealing, can protect the integrity of food packaging containers. Food in metal cans after sealing and sterilization program can store several years without corruption. However, the diet is based on modern concepts of "fresh" for the needs of the mainstream, so that the metal cans glory tends to gradually decline. Nevertheless, metal cans in the foreseeable future is still a very important food packaging containers.


3, glass containers


Glass is made of quartz sand, sodium carbonate, limestone and other additives, at a high temperature of about 1500 ℃ molten made. After a small group of the glass melt into a mold, blown shape of the container, cooling and annealing steps can be made of glass containers for food packaging. Modern equipment can produce more than 100 per minute of glass containers, glass container in food packaging for a place. To use glass-packaged food has many advantages: No corrosion, water vapor, oxygen and aroma were unable to penetrate the barrier excellent, transparent, health, odorless, recyclable, microwavable, can withstand high-temperature sterilization and so on ...... . However, due to the impact of intolerance glass container, fragile, container and heavier than other materials, so its application is also subject to some restrictions.


4, paper containers


Depending on the raw material, the paper can be divided into paper pulp, non-wood plant fiber paper, and recycled paper. Usually the main steps of the program packaging paper pulp, modulators, papermaking, and processing. In order to increase the durability of the paper, making it suitable for food packaging containers, often in the process of adding chemical papermaking additives, such as wet strength agents, drying agents, oil-repellent and so on. However, in line with safety regulations you must use additives in the aftermath of the dissolution to the packaged food in food, affecting their health.


Second, the development of new food packaging containers


The use of the above four packaging materials can develop many food containers. The following are the more important developments in recent years, a brief introduction.


1, microwavable containers


Development of food packaging container as people lifestyle change. Since 1970, after the microwave heating technology began to be used in food since research packaging materials or containers microwave heating on on vigorous expansion. Such as packaging material by microwave heating may be derived from security issues, microwave heating of food by uneven heating of the phenomenon and its relationship with the packaging container shape, etc., we are discussing. At present, there have been many long-term storage at room temperature storage, frozen food packaging can be directly using microwave heating.


In order to solve the deep-fried foods through crispness after microwave heating problem of insufficient, many packaging containers joined heater chip. Heating plate is made of metal and plastic are bonded together, in the presence of microwaves raw temperature quickly, so you can make contact with it crisp or brown food presentation state, commonly used in frozen pizza and other foods. Heating plate, and also for applications that require rapid heating microwaveable popcorn product, in the case of localized rapid heating, rapid expansion of corn can.


Most people probably have a concept that can not be placed in a metal container heated in a microwave oven may cause sparks, dangerous. But modern technology has put metal packaging and plastic composite, plastic is to use adhesive bonding to the plate, made of easy-open cans, lunch boxes and other containers, which can be directly heated by microwaves food, very convenient.

2, biodegradable food containers


Due to extensive use of food packaging containers, causing serious environmental problems. Thus, in recent years, the food packaging industry and academia have attached great importance to the development of biodegradable materials. Biodegradable packaging materials into three categories: one is a biodegradable material, by the microorganisms in the environment to break it down into carbon dioxide and water; the other is light-degradable materials, the use of ultraviolet sunlight to promote the decomposition of the packaging material macromolecules main chain scission, degrading it; third category is oxidative degradation of material, by definition, the role of oxygen by the packaging material and the formation of oxides and decomposition. Some biodegradable packaging material is made by a combination of these degradation mechanisms to achieve the purpose of degradation. Anyway, biodegradable food packaging materials is less highly regarded.


Biodegradable many types of packaging materials, use of natural materials, such as starch, vegetable protein (e.g., zein), chitosan, cellulose, after the chemical modification into a packaging container. Some synthetic polymer itself has Biodegradable, as raw materials of the packaging container. However, these biodegradable container material, most gas water vapor barrier problems or poor, so that their application is limited.


3, an aseptic package


Aseptic packaging is one of the important developments of modern food. In order to achieve the purpose of long-term storage of food in general is the use of metal cans or retort pouch packaging of food, and then use high-pressure high-temperature sterilization mode. However, aseptic packaging is a different approach, which is after the food and packaging materials are sterilized, then in a sterile environment, sterile aseptic packaging materials for food, so the production of packaged foods can be as Like canned food stored for a long time at room temperature.


We often can be sold in the market without refrigeration, appearance is rectangular carton of milk or juice drinks are manufactured using aseptic packaging. However, seemingly carton packaging, structure is not simple, often complex composed of five to seven soft material made, including plastic, aluminum foil, and cardboard, so that it can be able to get a stand, with good barrier properties, can adequate protection of food products.


4, active packaging container


Traditional food packaging, strictly speaking, are based on negativity protective measures, the use of sealing barrier formed when the container material itself, the food and the external environment barrier, so as to achieve the purpose of protecting the food. In recent years, the development of active packaging system is used more active measures to protect food. Active packaging is the use of special materials or devices, such materials or devices in the packaging of food and packaging will be inside the air or food that interact to achieve the purpose to extend the shelf life of food.


Active packaging of many types, the most common are deoxy packaging system, the control of carbon dioxide adsorption or packaging system, ethylene adsorption system containing preservative (preservatives, antioxidants) packaging systems, as well as control wet packaging system. In terms of control of gas composition (oxygen and water vapor), the most commonly used desiccant or deoxidizer is placed in the food packaging container.


Different deoxidizer composition into two categories, one is an inorganic compound (e.g., ferrous sulfate) as the main body, the other one is an organic compound (such as yeast, vitamin C, linoleic acid, vitamin E) as the main body. These are the use of their own oxygen scavenger reacts with oxygen inside the packaging container and put it consumed, so the food container from deterioration occurs by the influence of oxygen.


In addition to the oxygen absorber or desiccant packets placed outside of food packaging containers, it was also put them into thin slices directly affixed to the container. For example, a U.S. Patent, the iron powder is mixed with activated carbon and sodium chloride solution and dried, then the dried powder was mixed with the pulp and polyethylene, coated on non-woven, and then, this non-woven fabric having a deoxidizer component sandwiched between two layers of the highly air-permeable plastic film, i.e., into a packaging container can be affixed to the inner wall deoxy patch.


In addition, there are also placed in the cap of the deoxidizer. There is also a beer bottle is fitted to live dried yeast powder mixed with a wax coating on the cap liner PE film. During storage, beer moisture will gradually penetrate into the wax, make yeast activation. When the growth of yeast consumes oxygen metabolism, so just to keep the beer flavor.


Deoxy similar functions, it can also be used to make chemical reaction produces carbon dioxide inside the containers, in order to increase the shelf life of food. For example, adding carbonates and organic acids in the foregoing formula deoxygenation, when the carbonate decomposition of water, and organic acid, will release carbon dioxide.


In the design of the food packaging container having a moisture-proof function, we first need to have a moisture-proof packaging material. Glass and metal can be substantially moisture-proof, but not to need to use soft materials packaged food. Usually flexible packaging materials, often need to use a composite film to moisture, such as aluminum foil paper -PE- -PE composite material has a good moisture-proof effect. There is a Japanese soft packaging material, called "Toyal Dry", the intermediate layer contains the absorbent resin can absorb the same weight of water, a moisture-proof can be completely soft packaging material.


The anti-corrosion or anti-oxidants such as preservatives can be added directly to foods to extend shelf life of food, which is also commonly used approach in processed foods. However, corruption deterioration of food usually starts from the surface, the preservatives or antioxidants in whole foods are mixed somewhat redundant, there is a category of packaging material design is to solve this problem. Idea is very simple, just put preservatives or antioxidants added to the packaging material. After the food packaging, packaging materials when in close contact with food, food preservative can be released to the surface, to save food effect. However, since the preservative from the food surface will spread to the food inside, and so that the surface concentration decreased, lost function of protecting the food.


Therefore, how to control the release rate of the preservative, it is maintained at a certain concentration of the food surface is an important issue. There is a Japanese company has developed an antimicrobial film, the film added zeolite and a metal. It is reported that the film is packaged food, due to the presence of water vapor and oxygen, zeolite and metal effects of reactive oxygen species, after the release can inhibit microbial growth.


Over the past decade, China and has a lot of changes in consumer behavior and social structure of the world's advanced countries. Small families or single-parent families and single people in the community accounted for increasingly high rate, a substantial increase in professional women, both husband and wife working in the field has been the norm for young families, the elderly population increases, dining out population growth, environmental protection and the demands of other phenomena have affected the development of food packaging and containers. Food Packaging Technology has been trying to meet the needs of the times change. According to the study of history people often used by ancient vessel from era to understand the evolution of stone, pottery, iron, etc. and when people approach. Future historians will be more based on the development of food packaging containers to determine the patterns of activity in our society today.


Related tags:TinCanMakingMachine

Recent browse: