General classification of multifunctional edible packaging paper
Paper packaging mainly includes corrugated paper, honeycomb paper and concave-convex paper. Paper packaging derived from these three categories is often used for baking food packaging. For example: cartons, paper boxes, paper bags, paper cans, pulp molding, paper barrels, paper tubes, paper corners, paper trays, cardboard liners, paper tableware, paper trays, paper cups and so on.
Corrugated box has a large output and a wide range of applications, and is the most important packaging product in the world today.
The unique honeycomb structure of honeycomb paperboard makes it have good cushioning and shock absorption performance, and it is an energy-saving and environmentally-friendly packaging material with low cost and easy recycling. Honeycomb cardboard is widely used as cushion, tray, packing box, corner brace and edge guard, and can also replace the wooden packaging of baked goods for export.
Concave-convex paper has the irreplaceable unique advantages of corrugated paper, which develops rapidly and has broad market prospects.
Bean dregs edible wrapping paper
Compared with all kinds of edible packaging materials, the edible packaging paper developed from bean dregs has attracted the attention of some food production enterprises in recent years because of its rich raw materials, low price, simple processing technology, high economic benefit, high nutritional and health care value and high social benefit, and is going to be used in food industrial packaging, thus turning bean dregs into treasure.
Edible packaging paper is a research and development hotspot not only in Japan, but also all over the world. Its products are mainly used in the fields of convenience and leisure food packaging and edible packaging. It can be predicted that this edible wrapping paper will have a broad market.
Some people in Japan make waste bean curd residue into water-soluble "paper", which is widely used to package instant noodles, condiments, barbecues, cakes and fruits. The preparation method comprises adding fatty acid and protein acid into bean curd residue, decomposing it, washing with warm water, drying into dry fiber, and adding binder such as Rhizoma Dioscoreae, taro, dextrin, oligosaccharide and polypropylene glycol.
Japan's Takasaki Paper Company uses apple pomace discarded from food industry to produce pomace paper. The preparation method is: removing seeds from the pomace, mashing into pulp, and adding a proper amount of wood fiber to make paper. This kind of paper is easy to decompose after use, can be burned or composted, and can also be recycled for papermaking, which is not easy to pollute the environment and can be used for food packaging.
Sakai Agricultural Food Engineering Co., Ltd. has developed a method for producing edible paper from bean dregs, which includes the following steps: adding a proper amount of water and plant protease into bean dregs after juicing or extracting bean products, and filtering out the enzyme-treated bean dregs, that is, edible pulp containing 23%-25% dietary fibres; Then dry paper films of various sizes are made by the method and equipment for producing ordinary paper, namely edible paper.
This edible paper is widely used in food industry, such as seasoning wrapping paper for fast food noodles, wrapping paper for candy, biscuits, powdered food and drinks, etc. Because this kind of paper is soluble in water or saliva, it can be eaten directly, without chopping, and has high nutritional value; Because this paper is food fiber and contains no heat energy, it can also be used as a carrier of health food.
Compared with other similar products, edible bean dregs paper has the advantages of rich and cheap raw materials (bean dregs) and simple processing technology, which reasonably and fully solves the contradiction between food packaging waste and environmental protection and the treatment and utilization of by-products (bean dregs) in soybean food processing industry. It has high economic and social benefits, high nutritional and health care value and broad development prospects.
Chinese herbal medicine fruit and vegetable preservative paper
Chinese herbal medicine can not only cure diseases and save lives, but also be used as raw materials for papermaking.
At present, the Chinese herbal medicine fresh-keeping paper for fruits and vegetables is being developed, which is far superior to the existing fresh-keeping paper for fruits and vegetables, and can play a very good role in killing insects and sterilizing. This kind of paper is made by coating a variety of natural plants and Chinese herbal medicine powder on a special fruit package. More than a dozen Chinese herbal medicines, such as Stemona root, sweet tea, tiger fight, licorice root, galangal, etc., are used as raw materials, and are made into powder liquid after screening and crushing, which can be used for coating.
The paper has the advantages of simple manufacturing method, convenient material acquisition and low cost, and is especially suitable for small and medium-sized enterprises. In addition, the paper is easy to degrade naturally and does not pollute the environment, and its economic and social benefits are very obvious.
Edible paper food packaging
Edible packaging is the main trend of the development of new science and technology in the world food industry, which has been involved in a wide range of application fields, such as casing, fruit wax, sugar coating, sticky rice paper, ice coating and tablet coating.
It is a kind of paper-like packaging material made of edible raw materials, which can be divided into two categories: one is to make paper-like food packaging as thin as paper by adding some flavoring substances to common food raw materials such as starch and sugar paste; The other is to modify the edible non-toxic fiber and then add some food additives to make an edible "paper" for food packaging.
Edible packaging has many functions, is harmless to the environment, is convenient to obtain materials and can be eaten. Therefore, in recent years, the food industry in developed countries is competing for research and development, and new products and technologies are constantly emerging.
According to reports, there are many kinds of "food paper" packaged foods with beef flavor, chicken flavor and apple flavor on the market, which are deeply loved by consumers. "Extraordinary" is the application of edible paper food packaging in cold drink packaging, which plays a role in keeping out cold and hygiene.
This kind of packaging paper developed in Britain is based on carrot, with proper thickener, plasticizer and waterproof agent, and it is made into cheap and good edible colored vegetable paper by using the natural color of carrot. This kind of vegetable paper can be used as an independent (inner) package of boxed food or directly eaten as a convenience food, which can not only reduce environmental pollution, but also enhance the aesthetic feeling of food and increase the appetite of consumers. Carrot paper is a kind of edible colored paper, which has strong flexibility, water resistance, packaging function and edible function.
It was first developed in Japan, also known as paper vegetables. The common feature of plant food is that it is rich in dietary fiber, vitamins and minerals, among which dietary fiber is quite stable in processing and production, so the nutritional loss of processed paper vegetable products is very small, and the water content of the products is about 10%, which is convenient for transportation and storage. It not only improves the added value of vegetables, but also solves the problem that vegetables are perishable and difficult to store.
As far as production technology is concerned, there are two main methods: one is compression molding, in which the slurry is laid flat on the molding board and baked twice; The second is the roll forming method, that is, the slurry is directly pressed into paper by two counter-rotating rollers, and the finished product is obtained after molding and drying. These methods are all heated and dried, which will destroy heat-sensitive nutrients such as vitamins and natural pigments in vegetables, and the finished products will shrink and brown.
Freeze-drying technology can avoid the shortcomings of the above process. Freeze-drying technology is to sublimate the moisture of frozen materials directly from solid to gas under high vacuum (≤6 1 1Pa), and the whole drying process is carried out at low temperature. The finished product effectively maintains the original nutritional components and natural color of vegetables.
People can eat the food packaged with this "vegetable paper" directly without tearing the "wrapping paper".
At present, green edible packaging products made from vegetables are good packaging materials for snack foods and high-grade foods because of their high nutritional value and convenient storage and transportation, and have great market demand and development prospects.
Protein coated wrapping paper
A Japanese food company has developed a kind of protein coated wrapping paper, which is a kind of wrapping paper film coated with protein and made by a special process. It can withstand a certain temperature, prevent erosion, is non-toxic, is convenient for food processing and does not pollute the environment.
Water-resistant processing packaging paper This kind of packaging paper has good water resistance and air permeability, because its permeability is higher than other materials, its surface strength and interlayer strength are high, it is antibacterial and can absorb ammonia.
These characteristics are not available to additives, resins and chemicals, so they are safe and harmless. Because of these characteristics, MWS can be used in food packaging materials, condensation and water absorption films (sheets) and other fields. At present, MWS has been applied to vacuum packaging of distiller's grains food, compounded with other materials, and used as packaging paper for high-moisture semi-finished food, giving full play to its advantages of mildew resistance, water absorption and waterproof.
Food insulation wrapping paper
Recently, the United States has developed a paper that can convert solar energy into heat energy. They are like solar collectors. If you use it to package food and put it in a sunny place, the food in the package will be heated, and the heat will only dissipate when the package is opened.
Sainspurys Supermarket Co., Ltd. in London, England and DSsmith Packaging Company in England jointly developed an innovative portable corrugated paper packaging container with heat insulation and refrigeration functions, which is specially used for low-temperature refrigeration packaging of frozen foods in large supermarkets and supermarkets.
When the container is used for packaging low-temperature frozen foods, such as ice cream, ice cream, etc. The inner container can keep the temperature low enough at room temperature for a period of time to ensure that the packaged frozen food will not melt before the supermarket payment and on the way home, which provides great convenience for consumers.
The design intention of this innovative portable heat-insulating refrigerated packaging container is to improve the brand effect of goods and provide consumers with a good low-temperature refrigerated packaging environment. On the one hand, the design of this kind of packaging should fully consider the functional requirements of consumers, on the other hand, it should also consider reducing the packaging cost as much as possible to ensure the best low-temperature preservation effect.
As for the material selection of this package, because it is made of 100% pure pulp paperboard, the container can be recycled after being used and discarded, and it will not cause any pollution to the environment. The container can be folded and stored for reuse after use, and can be reused more than 10 times after actual use.
Preservation paper for food packaging
Food packaging fresh-keeping paper is a kind of special wrapping paper that can prevent food from rotting in a certain period of time. The paper is coated with plant bactericide, which has strong bactericidal power and lasting efficacy. Non-toxic, colorless and tasteless, and will not affect the health of consumers and the original flavor of food. Plant fungicides are volatile oils, and different fungicides are used for different foods, such as eucalyptus oil for oranges, cinnamon oil for peaches, and star anise oil for apples and pears. This has a considerable impact.
It is reported that Nippon Paper Company of Japan has successfully developed a new product of edible food packaging paper. The preparation method is as follows: First, the base paper is immersed in an ethanol solution containing 20% succinic acid, 33% sodium succinate and 0.07% sorbic acid, and then dried. The gravy food packed with this paper can be stored at 38℃ for 3 weeks without deterioration.
Japan has developed a kind of packaging paper with dehydration function without heating and additives. A semipermeable membrane permeable to water is selected as the surface material, and a high osmotic pressure substance and a polymer water absorbent are placed inside. Because the osmotic pressure difference of water in food in liquid state can move to high osmotic pressure substances through semi-permeable membrane, these water molecules are fixed by polymer water absorbent.
Packaging paper will not destroy food tissue cells, it absorbs water along the intercellular space, which can not only absorb the water on the surface of food, but also absorb the deep water inside, and also has the function of absorbing water at low temperature. The packaging paper can inhibit the activity of enzymes, prevent protein decomposition and reduce microbial reproduction, thus achieving the effects of keeping food freshness, concentrating umami ingredients, removing water and improving toughness.
Fruit bagging wrapping paper
Fruits cultivated by bagging technology are put on the market as green fruits, which is twice as expensive as similar products without bagging. At the same time, bagging fruit solves the problem of high pesticide residue in non-bagging fruit and promotes fruit export. In recent years, apple bagging paper and paper bag have formed an industry in China, which has promoted the research and development of bagging equipment. Pear bags, grape bags and vegetable bags have entered the market one after another.
Fruit bagging paper is divided into inner bag and outer bag, and bag paper is divided into inner layer and outer layer; The inner layer is black and the outer layer is generally natural. In order to prevent the damage of outdoor wind and rain environment, fruit bagging paper requires high wet tensile strength and high air permeability.
Due to these special requirements, the proportion of fiber raw materials and the selection of suitable additives are its technical points.
High-gram heavy food packaging chicken skin paper
Goose skin paper is a kind of flat thin wrapping paper with single gloss, with a basis weight of 40g/㎡, and its strength is not as good as kraft paper, so it is nicknamed "Goose skin paper". Chicken skin paper is tough, with high bursting resistance, good folding endurance, water resistance and good luster. Can be used for packaging food, daily necessities, etc. , and you can also print trademarks.
The traditional flour packaging bag is not satisfactory in strength and moisture resistance. At present, the basic experiment of high gram weight chicken skin paper for making flour in large and small packaging bags has been successful.
This kind of white chicken skin paper produced from imported bleached softwood pulp has high whiteness, no fluorescence and strong tension resistance, which meets the hygiene requirements. The paste bottom bag made of it adopts trapezoidal bonding method, each layer is bonded independently, and each layer is bonded together with point paste to make it more firm. Compared with ordinary paper bags, the strength of this new paper bag is 1.5 times higher. A four-layer paper bag weighing 25 kg fell freely at the height of 1.5 m, and the bag was not broken after 15 times.
This paper bag is hygroscopic. Under the same conditions, the shelf life of flour packed with it is 2 ~ 3 months longer than that packed in cloth bags. Another feature is non-toxic, tasteless and pollution-free, which meets the food hygiene standards.
Absorbent wrapping paper
The biggest feature of this kind of wrapping paper is its strong water absorption capacity, which can keep the water absorption capacity of this material 10 times, and is safe and harmless.
There are significant differences in water absorption capacity and water retention between water-absorbing functional paper and nonwovens, and water-absorbing functional paper is obviously dominant. This is because non-woven fabrics can only keep water in the pores between raw fibers, while paper not only has the above ability, but also the fibers themselves can absorb water, and the absorbent paper becomes very soft after absorbing water.
Because of these characteristics, water-absorbing functional paper can be used as a film (sheet) for absorbing dew of ham and sausage, a film (sheet) for absorbing dripping water of fresh food, and a film package for cosmetics and sanitary materials.