In our country, edible packaging forms, many have already been applied in real life: wax, oil, gelatin coated on the food, the fruit surface can effectively reduce water loss and prolong the shelf life; candy, pastry coated with glutinous rice paper, is made of sweet potato, corn or wheat flour and starch, the entrance. To isolate the food debris, preventing adhesion and outer packaging. In addition, the ice-cream sweet cone of corn baking packaging, sausage casing, etc. are typical edible packaging. In recent years, relevant research institutions and packaging enterprises have begun to study the preparation and performance of new edible packaging films.

Analysis of the bottlenecks in the development of edible packaging materials

Since the edible packaging film was studied in such detail, but also has a long history of practice, but as of now, why there is no large-scale application to industrial production and commercial application? Cause concentration without heat sealing in the barrier is not stable, and insufficient mechanical strength.

1. barrier property

For most foods, microbial growth is the main cause of food deterioration. Cleaning, disinfection, cooking, barbecue, smoked and other process can effectively reduce the number of microorganisms, but because of differences in food contaminated raw materials processing, packaging, different health conditions will affect the food product of microbial residues. In the later storage and transportation, if the temperature, humidity and gas quantity are suitable, the microorganism will still grow and reproduce a lot to speed up the deterioration of the food. As the last barrier of food and external environment, packaging membrane has a very important relationship with the maintenance of food quality, which obstruct the permeability of gas and water vapor.

2. tensile strength and elongation at break

Tensile strength refers to the maximum stress value before packaging film breaking, and the elongation at break is the ratio of the length of the packaging film to the initial length after stretching. This test can effectively solve the problem of breakage and breakage of the packaging film under external force, and compare and analyze the test data of various kinds of edible packaging films, which can help judge and select the appropriate matrix and technology for research and development.

3. tearing degree

In the process of storage and transportation, packing bags are often torn under the influence of external force. Therefore, the packaging film should have sufficient tearing resistance to reduce the transfer of tearing and reduce the possibility of leakage. On the other hand, the opening part of the "easy to tear" package also requires a certain tear force, so the tear degree is a key point in the application research of edible packaging film.

4. thermal sealing performance

The breakage of the packaging is the first problem that affects the quality of the packaging, and the sealing is the most damaged part. At present, sealing technology is mainly applied to heat seal technology, that is, heating to the preset temperature. The two layer or multilayer packaging film is heated into molten state, and the membrane molecule is permeated and fused by a certain pressure. After a period of time, it is integrated into one body, namely sealing. Therefore, it is necessary to ensure that the bag has good sealing strength and sealing, the hot sealing material and the hot sealing process are the key.

Breakthrough bottlenecks are edible packaging with the future

Food packaging is a big household in the packaging industry, accounting for about 70% of the packaging industry. Food packaging waste is also the greatest pollution to the environment. Therefore, solving the problem of food packaging waste is a major problem in the packaging industry, and developing edible packaging materials is a good way to solve the contradiction between food packaging waste and environmental protection. Developing edible packaging is a new way. The goal is to create an edible packaging film that does not affect the flavor of packaged foods, that is, edible paper.

This kind of technology has also been developed preliminarily. A company in Queensland, Australia, is made of an edible potato chip package, abroad. After eating potato chips, people can eat their packaging and do not cause waste. In Japan, an edible packaging paper made from chitosan and chitosan has been developed. This edible wrapping paper can be cooked in a hot pot directly. This kind of edible paper packaging is convenient and fast, and avoids the pollution of packaging waste, and does not have any negative effects on the environment. Such technology should be popularized and popularized, and let me become more beautiful in a healthy and pure environment.