The daily use of plastic packaging bags should pay attention to these points
Plastic packaging bags are very common containers for holding items in daily life. The plastic packaging bag is waterproof, windproof, light in weight, not afraid of falling or touching, and easy to carry. They are deeply trusted and praised by consumers. In order to give full play to the role of plastic packaging bags and improve their use value, in daily life, many people also use plastic packaging bags to preserve various fruits and vegetables. However, when packaging vegetables and fruits with plastic packaging bags, special attention is required.
(1) plastic bags can effectively extend the storage period of fruits and vegetables. Fruits and vegetables are organic with high moisture, water-soluble nutrients and enzymes 1. During the storage of fruits and vegetables, there will be strong respiratory activity. Fruits and vegetables stored in plastic
In the packaging bag, the mouth of the plastic packaging bag is opened every two or three days to release carbon dioxide and heat, and then the mouth is tied up. The principle of reducing low oxygen concentration and increasing carbon dioxide concentration can effectively reduce
Decay and spoilage of fruits and vegetables. Using plastic bags to store fruits and vegetables is a common method in daily life, especially in winter, it can keep fruits and vegetables fresh.
(2) The storage time of fruit and vegetable plastic packaging bags should not be too long. Lowering the oxygen concentration and increasing the carbon dioxide concentration can slow down the respiration of fruits and vegetables, but excessive control will make fruits and vegetables break down more nutrients to obtain enough energy, and maintain low oxygen respiration. Alcohol produced inside fruits and vegetables, which leads to decay.
Before printing, color separation plate making is carried out first. Color separation plate making requires white plate to be used for backing and corresponding color plate. This operation can be carried out in the electronic carving system, and can also be planned in the prepress planning system, and then the printing plate can be directly carved on the electronic carving machine.
If printing is carried out on a unit-type printing machine, the detailed steps are plate loading, scraping knife, ink preparation, ink mixing, rolling, ink test, conditioning and formal printing.
The color printing plastic bags are covered in a special laminating machine. The production of plastic packaging bags is the bag, the practice is bonding, the two layers of film bonding to form a three-sided sealed plastic packaging bag, and cut into a single bag.
