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, cartons, paper bags, paper cans, pulp molds, 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 environment-friendly packaging material with low cost and easy recycling. Honeycomb cardboard is widely used as cushion, tray, packing box, corner brace, edge protection, etc., 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.
Edible wrapping paper of bean dregs
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, so as to turn bean dregs into treasure.
Edible packaging paper is a research and development hotspot not only in Japan, but also in 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, fruits and so on. Its preparation method is as follows: adding fatty acid and protein acid into bean curd residue to decompose it, then washing it with warm water and drying it into dry fiber, and then adding binders such as yam, taro, dextrin, oligosaccharide and polypropylene glycol.
Japan's Takasaki Paper Company produces pomace paper from apple pomace discarded by food industry. The preparation method is: removing seeds from the pomace, mashing into pulp, and adding proper amount of wood fiber to make paper. This kind of paper is easy to decompose after use, and 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 by using 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 bean dregs after enzyme treatment, 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, biscuit, powdered food and beverage, etc. Because this paper is soluble in water or saliva, it can be eaten directly without shredding and has high nutritional value; Because this kind of 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. After screening and crushing, they are made into powder liquid, 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, this paper is easy to degrade naturally, 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 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, tablet coating and so on.
It is a kind of paper-like packaging material made of edible raw materials, which is divided into two categories: one is to add some flavoring substances to common food raw materials such as starch and sugar paste to make paper-like food packaging as thin as paper; The other is to modify the edible non-toxic fiber and add some food additives to make an edible "paper" for food packaging.
Edible packaging has various 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 have been 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 cold and hygienic.
This kind of packaging paper developed in Britain is based on carrot, with proper thickening agent, 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 a single (inner) package of boxed food or as a convenience food, which not only reduces environmental pollution, but also enhances the aesthetic feeling of food and increases the appetite of consumers. Carrot paper is a kind of edible colored paper, which has strong flexibility and water resistance, as well as packaging function and edible function.
It was first developed in Japan, also called paper dish. Plant food 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 the production technology is concerned, there are two main methods: one is compression molding, in which the slurry is laid flat on the forming plate 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 the 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 that under the condition of high vacuum (≤6 1 1Pa), the moisture of frozen materials is directly sublimated from solid to gas, 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 huge market demand and development prospects.
Protein coated wrapping paper
A Japanese food company has developed a kind of protein-coated packaging paper, which is a kind of packaging paper film coated with protein and made by special technology. It can withstand a certain temperature, prevent corrosion, 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 it has higher permeability than other materials, high surface strength and interlayer strength, is antibacterial and can absorb ammonia.
These characteristics are not obtained by 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 the vacuum packaging of food made of distiller's grains, compounded with other materials, and used as packaging paper for semi-finished food with high moisture content, giving full play to its advantages of mildew resistance, water absorption and waterproof.
Food insulating 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 be emitted 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 checkout 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. The design of this kind of packaging, on the one hand, should fully consider the functional needs of consumers, on the other hand, it should also consider the minimization of packaging cost to ensure the best low-temperature preservation effect.
In the material selection of this package, because 100% pure pulp paperboard is used, the container can be recycled after being discarded without causing any pollution to the environment. The container can be folded and stored for reuse after use, and can be reused for more than 10 times after actual use.
Preservative 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 foods use different fungicides, 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 the Japanese paper company in Japan has successfully developed a new product of food packaging paper that can be preserved and eaten. The preparation method is as follows: First, the base paper is soaked 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 adding additives. A permeable semipermeable membrane 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.
Wrapping 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 water in the deep 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 fresh, concentrating umami ingredients, removing moisture 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, fruit bagging solved the problem of high pesticide residue in fruit without bagging, and promoted the export of fruit. 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.
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 thin plane wrapping paper, with glossy single surface, with a basis weight of 40g/㎡, and its strength is not as good as kraft paper, so it is also nicknamed "Goose skin paper". Chicken skin paper is tough, high in bursting resistance, folding resistance, water resistance and good in luster. Can be used for packaging food, daily necessities, etc. , you can also print trademarks.
Traditional flour packaging bags are not satisfactory in strength, moisture resistance and so on. At present, the basic test of high gram weight chicken skin paper for making flour-sized 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 tensile force, which meets the hygiene requirements. The paste bottom bag made of it adopts trapezoidal bonding mode, each layer is bonded independently, and each layer is bonded together with point paste, which is more firm. Compared with ordinary paper bags, the strength of this new paper bag is increased by 1.5 times. A four-layer paper bag weighing 25 kg fell freely at the height of 1.5 m, and the bag was still unbroken 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 packaging paper is its strong water absorption capacity, which can keep the water absorption capacity of this material 10 times, which 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, and paper not only has the above ability, but also the fibers themselves can absorb water, so 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 from ham sausage, a film (sheet) for absorbing dripping water from fresh food, and a film package for cosmetics and sanitary materials.