Common materials for making retort bags include PET, AL,BOPA, RCPP, etc. These materials have their own advantages and disadvantages in terms of mechanical properties (stretching, peeling, impact resistance, etc.) and physical properties (moisture barrier, oxygen barrier, cold and heat resistance, etc.). Therefore, in production, two-layer, three-layer or multi-layer composite structures are used according to the type and requirements of the contents to obtain the best performance.
However, the problem of bag breakage still occurs. Conventional retort bagged foods adopt the following production process: raw material acceptance → processing → bagging → vacuuming → hot melt sealing → inspection → heating sterilization → cooling → dry packaging, among which bag breakage often occurs in the heating sterilization and cooling stages.
Because the bagging stage requires the filling amount to be lower than the bag capacity to prevent the influence of sealing contamination on the heat sealing quality, and the bag cannot reach an absolute vacuum state during the vacuuming stage, these two situations will cause a certain amount of gas to remain in the retort bag. When the vacuum-treated retort bag is heated at high temperature, the water content of the bag evaporates to form water vapor, which expands together with the remaining gas in the bag due to heat, and the pressure rises suddenly. When it exceeds the maximum pressure that the retort bag can withstand, the weak part of the bag will first break. In addition, there is also a risk of bag breaking during the cooling process. When the cooling water enters the retort pot, the pressure outside the bag drops sharply, but since the contents of the bag cannot be cooled synchronously, the pressure inside and outside differs by several times, which will inevitably cause bag breaking accidents.
Henan Baolai Packaging Six years ago, we found that the retort bags broke in the following parts: breaking from the heat-sealed edge; breaking from the inside of the heat-sealed edge; breaking from the inner layer inside the heat-sealed edge due to the delamination of the heat-sealed layer and the outer layer.
In response to these phenomena, Henan Baolai Packaging Co., Ltd. has adopted strict production procedures. Composite films with different film materials and structures have different heat-sealing parameters. We conduct heat-sealing strength tests on retort bag samples before production to determine the rationality of the test heat-sealing parameters and select the best parameter combination.
Our factory has established a product quality control system guided by experiments and guaranteed by random inspections to fundamentally prevent bag breakage accidents.
FAQ :
Q: What is the lead time of the custom baby food spout Pouch bag?
A:Lead time about 20 days for 100,000pcs Baby food Spout Pouch Bag.
Q:Can I get some samples before I place the formal order?
A:Yes , We provide free samples of the custom baby food spout Pouch bag, Can send to you the samples to test our quality and your filling machine . if this is your new project, you should tell us your filling machine use the Spout size and mold, so that we can provide you the best samples. If this is your old project , you just send us a picture of the old bags, then we can send to you the samples .
Q:Can you customize samples for custom baby food spout Pouch bag?
A： We provide custom 100% samples before formal order, cost is needed .
Post time: Dec-12-2024