The way to keep fruits and vegetables fresh is to reduce water loss, inhibit biological respiration and bacterial growth, and at the same time remove the ethylene gas that makes them aging and ripening. Preserving corrugated cardboard is processed manually from these aspects.
1. Laminated
The plastic film soaked with antibacterial agent and fresh-keeping agent is made in corrugated cardboard, and then coated with CTM fresh-keeping agent on the inner surface of the corrugated cardboard. Its composition is the comparison technology and application of compressive strength of waterproof corrugated cardboard Technology & Application Plant hormone absinthe And its derivatives, oxalone and its derivatives (such as cypressol) and terpene ethers. This corrugated board can prevent moisture evaporation, maintain the freshness of the goods in the box, and adjust and control the temperature.
2. Compound
Aluminized cling film is laminated on the inner surface of corrugated cardboard. This composite film has the function of absorbing ethylene gas. The aluminized film can prevent moisture evaporation and reflect radiant heat, prevent the temperature in the box from rising, and play a role in freshness preservation. .
3. Foam type
Combine the foam and corrugated. Compared with ordinary and plastic-laminated corrugated board, it has better fresh-keeping effect.
(1) The moisture permeability is 1/20 of ordinary corrugated cardboard, and it is not easy to shrink fruits and vegetables due to water evaporation.
(2) Due to the low number of heat conduction systems and good heat resistance, there will be no sharp temperature fluctuations in the box. (3) Due to the low air permeability, it can achieve the effect of adjusting the storage atmosphere. The above three corrugated cardboards were used to make cartons, and the fresh-keeping effect of cauliflower was evaluated. As a result, the oxygen content in the foam-type fresh-keeping corrugated cardboard boxes gradually decreased, and the CO concentration increased, which inhibited the respiration and growth of cauliflower; Although cauliflower has less flowering due to lack of oxygen, it has pests and diseases, and has a strong odor; while the atmosphere in the ordinary carton is almost the same as the atmosphere, and the cauliflower turns yellow and deteriorates.
4. Hybrid
In the manufacturing process of corrugated cardboard inner paper, porous ethylene gas absorption powder is added to prevent ripening; special ceramic powder that can emit infrared light with a wavelength of 6 m to 41 * m can also be coated on the base paper, which can emit infrared light at normal temperature. Not only can the relevant molecules in the fruit be activated and improve the ability to resist microbial erosion, but also the enzyme can be activated to improve the sweetness of the fruit. It is good for fresh-keeping packaging of peach, grape, bayberry and other fruits.
