In food packaging materials, some special new packaging materials have appeared in recent years . These materials are more intelligent and can reflect more value in food packaging. However, for various reasons, there are many more that want to quickly popularize the use of these materials .
Food packaging bags of special materials
1) Wood flour plastic. Japanese scientists and technicians researched and developed a wood powder plastic packaging material from pine wood. By making polyol out of wood powder, it reacted with isocyanate to produce polyurethane. Such wood plastic strong heat resistance, and can be biodegradable, temperature can be used to make composite packaging bags.
2) Corn plastic. American researchers have developed a corn plastic packaging material that is easy to decompose. It is made of corn starch incorporated into the polyethylene, the plastic suitable for making food packaging bags integrated composites. The package can quickly dissolve in water to avoid contact and invasion of pollution sources and bacterial toxins.
3) Rape plastic. A rapeseed plastic packaging material was successfully developed by the United Kingdom. It extracts three genes that can produce plastics from the bacteria that make biopolymers, and transfers them to the rape plants. After a period of time, a plastic polymer liquid is produced, and after refining, a plastic canola is obtained. This kind of plastic processing packaging material or food fast food packaging material can be decomposed by itself after being discarded without pollution residue.
4) Wheat plastic. This is to use wheat flour to add glycerin, glycol, polysilicone oil, etc. to mix and dry, and then add 150kz / Id pressure and hot press to become a translucent plastic plastic film. The advantage of packaging food with wheat plastic is that it can be decomposed by microorganisms.
5) Soybean plastic. The United States uses soybean-derived protein to create plastic-like food packaging materials that can replace plastics synthesized from petroleum. This production technique is to soak and grind the soybeans to separate the protein, then dry the protein solution to remove the water, and then mix the protein powder with other ingredients and additives to make an edible film or coating. Used for food packaging. They have good strength, elasticity and moisture resistance.
6) Chlorophyll plastic. German scientists invented a plastic film that was "stained" by chlorophyll. Most green fruit and vegetable foods contain a large amount of chlorophyll, and this pigment will undergo a photo-oxidation reaction under light irradiation, decomposing the energy in the food, resulting in food rot. The plastic film is "dyed" with chlorophyll in a special method. After this treatment, the film can be used to package food, which can effectively intercept the light that causes the food to rot, thereby greatly extending the shelf life of the food.
7) Bacterial plastic. British researchers have developed a PHB bacterial plastic. It first cultivated a bacterium with sugar, and processed it into a material similar to polypropylene. The material is non-toxic and easy to biodegrade. It is an ideal material for processing and making food packaging bags . It will not pollute the environment after being discarded.
8) Bacterial detection film. This is a special film that can detect bacteria, that is, a special coating is applied to the surface of ordinary food packaging films to make it have the special function of detecting bacteria, such as the detection film for raw and cooked meat packaging, if The packaged meat food is already fresh, and the content of harmful bacteria exceeds the food hygiene standards. Packaging with this film will make the original transparent and colorless packaging film become a warning color, so that consumers know that meat food is no longer edible .
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