Introduction to the types of green packaging materials (2)

2, edible packaging materials

Edible packaging film. For decades, the familiar rice candy and the ice-cream corn baking cups are typical edible packaging.

The mature ones in the synthetic edible packaging film are the pullulan resin which has been industrially produced in the 1970s. It is a odorless, odorless, amorphous, amorphous white powder, which is a nonionic, non-reducing The stable polysaccharide, because it is a polydextrose composed of α-glucoside, is easily dissolved in water and can be used as a viscous, neutral, non-separating non-gelatinized aqueous solution. The 5%-10% aqueous solution can be dried or hot pressed to form a film with a thickness of 0.01mm. The film is transparent, colorless, odorless, non-toxic, tough, highly oil resistant, edible, and can be used. Instrument packaging. Its gloss, strength and folding resistance are better than those made from high-chain starch.

Edible plastic wrap. As early as the 12th to 13th centuries, China used wax to coat oranges and lemons to delay their dehydration weight loss. Extend the shelf life of fruits and vegetables.

The edible cling film currently generally used has been developed into a multi-component edible film made of various biomacromolecules (proteins and polysaccharides) and lipids having various functional properties. The composite membrane is mainly composed of a stable emulsion formed by different intermolecular interactions, and then dried to form a porous, transparent or translucent three-dimensional network structure film which is formed by volatilization of a solvent. The film has obvious water repellency and a certain choice of gas permeability, so it has a broad application prospect in the food industry, especially in the preservation of fruits and vegetables.