During vacuum bag packaging placed up bag is what reason is caused?

Recently several customers in the process of upgrading the packing, tell us, they many good packing bag, placed two weeks later, the number of air pockets inside the bag significantly increased, a significant reduction in the vacuum degree, the serious influence product quality, what should I do? Today, the professional manufacturer of flexible packaging packing is combinative oneself after empirical analysis of the vacuum bag packaging put up bags in the process of the cause and the solution. 1, cause assumes that bag is a common phenomenon, is perhaps reasons are as follows: 1. The barrier property of packet lack; 2. After vacuum packaging, gas bacteria in effect. 3. Incomplete sterilization. We can after a brief comparison of experiments, then judging whether the bags own good barrier property owe! (such as rice, put a period of time Two weeks) After vacuum adhere to excellence, the barrier property of packaging materials is not appear up bag of the dominant factors. Tests showed that: when the concentration of oxygen in the packaging & le; 1%, microbial growth and reproduction rate fell sharply; Oxygen concentration & le; 0. 5%, most microorganisms was restrained and breeding in succession. ( Note: vacuum packing can't refrain from anaerobic bacteria breeding and enzyme reaction caused by food metamorphosis and discoloration, therefore also needs to combine with other adjuvant, such as cold storage, frozen, dehydrated, high-temperature sterilization, irradiation sterilization, microwave sterilization, salt and so on to get sterile effect) 。 Incomplete sterilization, often constitute a microbial overruns. Because the primary performance in two aspects, one is, the sterilization process is unreasonable, sterilization temperature and time of fault; The second is, improper operation or error quality is not stable. The cause of food sterilization faults: 1. Equipment, appearance aspects constitute negligence: sterilization pot is not in accordance with the requirements of technical standard equipment, uneven heat distribution pipeline system leakage, leakage, leakage or wall, pan door may pot body, the pot body insulation layer is incomplete, results in uneven temperature steam, compressed air, water and so on under using standard; Mercury thermometer damage may flash is not accurate, the radian of automatic temperature recorder failure or pointer do not mesh with recording paper, or flash temperature is not strongly planning across the mercury thermometer; 2. Product is composed of faults: sterilization temperature is lower than at the beginning of process requirement, the largest amount of canned across rules, product PH value across the planning, production line or changes in the formula, cage way to change, make the canned stack put or plate using the wrong crossed the highest water activity; 3. Operating faults: sealing cans sterilization time across process rules, to make the early bacterial count increases; Exhaust operation failed to meet the requirements of process rules of temperature and time together. Sterilization temperature and time of the below process allows the planning. 2, cases such as 'food quality and safety case analysis' P114 & other; 5. 5 vacuum packaging boiled food mould & throughout; For example: flexible packaging boiled vegetables ( Contents include: ferns, mountain celery, bamboo shoots, carrot, mushroom shavings, etc. ) , PH 4. 2 - 4. 4. Phenomenon: solids mold products, with the hand gently touch contents to soften, shaking into fruit and vegetable juice protoplasmic posture, but there is no higher food bags. Sampling analysis, found that there is a lot of mold, the mold just over heated to 70 degrees will be killed. Caused by microbial overruns, the cause of incomplete sterilization: 1. The scene processing, such as material storage time is too long, after selection and water rinse conceptions. Between the working procedure and next working procedure, on show in the time interval is too long in the air; 2. Some product engineering time long, appeared in the air may cause bacteria reproduce phenomenon; 3. Sterilization workers operating at random, there is the phenomenon of sterilization (not in time Some products from after vacuum packaging to sterilization time interval is too long, no sterilization products at room temperature 30 degrees such as exposure time is too long, may cause the phenomenon of incomplete sterilization; There are signs of shortening the time of sterilization.