High temperature cooking bags broken bag after cooking, is the way it is!

In this paper, the phenomenon of composite bags broken bag after cooking, by the method of test standard, analyzes the possible cause the five factors of bags torn bags, hope to be of help. A, heat resistance testing standard method (GB/T10004 - 2008 packing plastic composite film, bag of dry compound, composite extrusion of heat resistance requirements: using temperature is 80 ℃ above products after heat test, should be no obvious deformation, interlayer strip and the heat sealing part stripping anomaly. Test method: heat sealing membrane made from 200 mm & times; 120 mm small bag ( Smaller than the size of products according to the actual specifications) , filling the bag a half to two thirds of the water sealed exhaust volume, in high pressure sterilization pot with back pressure device ( Hot pot) , 30 min. Temperature, high pressure sterilization pot boiled at 100 ℃, high temperature water press with the highest use temperature processing. 2, may cause analysis may cause of cooking broken bags under several factors: (1) heat sealing strength is not enough, but the detection of bounding strength while meet the corresponding standards, but it had obvious attenuation under the condition of high temperature cooking phenomenon, lead to strong enough to support the pressure inside the bag and torn bags. Charging the sealing process prone to heat sealing unqualified two factors: one is the sealing stuffing, the situation of unqualified appears only in the clip material products, the discontinuity. Second, splint has caused by foreign body sealing is lax or uneven pressure may also lead to seal knife. (2) the peel strength is poorer, by the same token, the temperature of peel strength, not the strength of the representation under the condition of high temperature cooking, such as insufficient heat resistance of glue ( Inadequate rubber crosslinking) , under the high temperature stripping force attenuation substantially, reinforcing effect on thermal bonding strength is reduced. Below is GB/T 10004 - Peel strength before and after the 1998 high temperature cooking bags, cooking and thermal bonding strength of technical requirements, if you don't satisfy its technical requirements, then the quality of the bags there may be some hidden trouble. Testing project, N / 15 mm peel strength of PET/AL&ge after cooking before cooking; 3. 5≥ 2. 8PET/PA≥ 3. 5≥ 2. 8 al / CPP≥ 4. 5≥ 3. 4 al / PA≥ 4. 5≥ 3. 4 pa / CPP≥ 5. 0≥ 4. pet / CPP≥0 5. 0≥ 4. 0 heat-seal strength PA ( Or PET) / CPP≥ 30≥ 24PA（ Or PET) / AL / CPP≥ 40≥ 32 PET / PA / AL / CPP, PET / AL / PA / CPP≥ 50≥ 40 technical requirements (3) cooking operation factor of retort pouch, if an inn door, other manufacturers offer bags are broken after cooking bags of the same quality problem, usually, it is not the quality problem of the wrapping itself. The sealing operation: first to load the contents inside the retort pouch, exhaust or after pumping air into vacuum state, heat sealing on the sealing machine and check the fastness to achieve technical requirements. In the canned contents, don't pollution pincer-like device intima, especially oil or powder content. If the pollution, the sealing strip is put less than required, may be torn bags leak at cooking. Back pressure operation: first is slowly open the inlet pipe valve, let the pot pressure higher than the original 0. 01 ~ 0. 02 mpa, and then open the high-pressure cooling water inlet valve, let the cold water spray to the pot. At this time, the pot pressure suddenly drops, if there is no high pressure drop is too big and the air pressure inside, it is possible to bag outside pressure is higher than the bag ( The pot room) Pressure produced by blasting, leakage. In order to avoid the accident, be careful to open the high-pressure air inlet valve, in order to maintain the chut spray cooling process, the minimum pressure of the pot space and the same as the numerical heat/pressure, absolutely can't let one following a sharp drop in. (4) there is a deviation on temperature control, indicating temperature does not accord with actual temperature, is beyond the scope of the bags can withstand the limit. (5) bag heat sealing surface should be fully fusion, medial 1 - does not exist The length of the 2 mm can tear phenomenon ( Under the high temperature intensity attenuation substantially) 。 In addition, from the specific phenomenon of cooking torn bags, conducive to the further technical analysis: (1) resulting from poor heat sealing strength of broken bag, performance phenomenon: break between the parts from the two heat sealing layer material release. (2) removing bad or back pressure operation bad break bag phenomenon, is the sealing edge abscission layer, the difference is peel strength decline rate is different before and after the cooking.