General food packaging bags do not need to be punched, but in order to release the air in the bag after sealing and avoid air occupying space, it is necessary to punch and deflate. Usually, air holes are punched in the bag body. There are also round holes or butterfly holes on the top of the bag, which are used to hang things, called hanging holes.

Another important reason is that if the food packaging bag is not perforated, there will be air inside. After long-term transportation, water vapor will be generated inside, which will make the products inside damp and moldy.

Precautions for mutton rolls

Most of the mutton rolls sold in the market are actually scraps of sheep, and the prices of mutton rolls vary. Many people think it is a good mutton roll, but in fact, most mutton rolls are synthetic meat, not good mutton.

Many restaurants will choose to use synthetic mutton rolls instead of pure mutton, which can make better profits. If you want to eat pure mutton, you'd better choose mutton and cook it at home. Mutton slicer, cut into a roll. Also, the mutton slices sold are all cut out of frozen mutton strips, and there is no way to separate the parts.