When the central part of bread and cake is cooled to about 35 ℃, it shall be packaged immediately. If you continue to be exposed to the air for a long time, bread and other products will be very easy to age, infect mold, lose too much water and affect the flavor.
1、 Delayed product aging
The bread after starch aging is hard and dry, the core is inelastic, and it is easy to break and fall when slicing. This not only affects the flavor, but also reduces the digestion and absorption rate of the human body. Aging is an inevitable trend in bread storage, but packaged products can delay aging. The reason is that bread is stored in a relatively constant humidity state, which is not easy to lose water. It can delay the water phase separation of starch colloid. Colloid water loss is also an important reason for aging.
2、 Prevent pollution and mildew
Bread, as a direct food, requires cleaning and sanitation to prevent pollution of dirt and fungi in the process of storage, transportation and sales; The moisture content of bread epidermis is generally about 12 ~ 16%. If the temperature and humidity are appropriate and there is mold infection, it will be a very moldy food. In recent years, some manufacturers have added anti mildew agents and other measures to prevent mildew and deterioration in summer, but mildew can not be avoided if they are not properly packaged. The packaged finished products can prevent infection in contact with air, containers and hands and prolong the storage life. If mold inhibitor is applied in the formula, and packaging materials with good water resistance can be used, the experiment shows that it can be stored for half a month under the conditions of 32 ~ 35 ℃ and 90% relative humidity; Bread without mildew inhibitor has good sealing performance in packaging and can be maintained for 7 days. However, under the same conditions, if the bread without packaging can only be stored for 2 days, it can be seen that packaging is important to prevent mildew.
3、 Prevent damage
Bread not only has the possibility of pollution, but also has the disadvantages of damage and deformity in storage, transportation and sales. In particular, products with soft texture or sprayed slurry on the surface are more likely to occur. Packaging bread with film can not only avoid mutual friction and breakage, but also play the role of shock absorption, prevent collision and damage the integrity of appearance. For products that are easy to flatten or have a coating on the surface, it is advisable to use a transparent plastic tray for protection, and then wrap the film.
4、 Beautify goods and improve value
The packaged products are very eye-catching due to the novel design and gorgeous color, which beautifies the goods and improves the product grade. Packaging can also promote the nutritional characteristics of products. It can be said that packaging is also a form of advertising, making products well-known.