Compared with the fixed concentration of the specific gas filled in the nut product package, the concentration of various gases in the finished package changes during the subsequent storage, especially the oxygen concentration.
Cause Analysis
(1) packaging materials
Poor barrier properties - High permeability of packaging materials to gases such as oxygen, nitrogen, carbon dioxide and air (ie, lower barrier properties), resulting in a higher oxygen content (or amount of air) infiltrating into the package and a loss of nitrogen inside the package high.
Resistance to rubbing poor - For aluminum-containing material (aluminum foil or aluminum film) packaging composite film, if the packaging material resistance to rub worse, when subjected to external friction or extrusion, easy to form creases, pinholes And other issues, causing the nut products used in packaging materials to reduce the barrier.
Poor puncture resistance - Some nut products with a more sharp shell, the bag will have a puncture force, if the package puncture resistance is poor, prone to leakage.
(2) finished product packaging production process
Poor sealing - Nuts finished packaging bags or heat sealing parts prone to pressure or prolonged storage leak occurs, especially in the sealing parts of the sealing quality is poor, such as the heat seal strength is too low Or too high, hot air intensity is uneven, the more likely to leak phenomenon.
--Considering the monitoring of oxygen permeability, nitrogen permeability, air permeability, oxygen permeability after rubbing, sealing performance (negative pressure method), heat seal strength, puncture resistance and other properties.
- Adjust the parameters of the heat sealing machine to improve the sealing performance of the heat sealing parts. Select the packing material with high barrier property, good rub resistance and anti-puncture property, or improve the quality of the existing packing material.
