[Chinese Packaging Network News] Expanded snack food packaging is relatively simple, generally used plastic composite pillow bag as a product packaging. Plastic composite packaging has the following advantages:
First, there is a good product protection effect. A wide variety of plastic composite packaging materials can have a variety of composite combinations, including plastic-plastic composites, paper-plastic composites, and aluminum-plastic composites. Through different composite combinations, different foods can meet the requirements of packaging strength, tightness, oxygen barrier, water resistance, light blocking, etc. For example, the packaging material for general expanded snack foods is OPP/aluminum/PE, among which OPP guarantees. The strength of the material and the printing effect of the packaging, the aluminum plating material has a good effect of blocking oxygen, blocking light, and the like, and the PE layer functions as a heat sealing agent.
Second, the printing effect of plastic composite flexible packaging is good and the effect of shelf display is good.
Third, composite film packaging materials are suitable for mass production and automated packaging.
Fourth, this packaging method is low in cost and light in weight.
The vertical packaging machine for packaging expanded snack foods belongs to a multi-functional packaging machine. The machine adopts a roll film as packaging material, and the single machine can complete a series of functions such as bag making, filling materials, nitrogen filling, sealing, cutting and printing date. General vertical packaging machine adopts PLC control, in addition to complete the above basic functions, but also have automatic shutdown, automatic diagnosis alarm, and security protection functions.
In the packaging process, the inflation and sealing problems are very critical. Extruded snack foods are fragile. During the production, transportation, and sales process, the products are prevented from being squeezed by machinery or the outside world, and such foods are susceptible to moisture and oxidation. Therefore, expanded snack foods are generally filled with inert gas nitrogen. The method of general inflation is to add a trachea inside the forming vessel, which is connected to the air source via a solenoid valve. When the packing machine is working, the solenoid valve and the packing machine are matched to work, and the air is inflated into the bag immediately before sealing and sealing. The size of the air volume and the length of the filling time are adjustable. Excessive aeration can blow the product up and cause jamming; too little aeration can no longer protect the product.
Since the packaging of expanded snack foods is to be inflated, it will inevitably require good and reliable sealing of the packaging bags. In order to achieve better sealing requirements, in addition to the use of heat-sealing packaging materials, the performance of the packaging machinery itself has also played a significant role. Firstly, the shaper and the sealer of the packaging machine are required to be easy to use, so that the bag can be formed smoothly and not pleated during sealing, because horizontal packing is one of the main reasons for the air leakage of the bag under the normal working conditions of the packaging machine. Secondly, the intersection of the horizontal seal and the vertical seal should pay special attention, because here is the transition between the two-layer film and the four-layer film. Here, materials of different thicknesses need to meet the sealing requirements in one seal of the transverse seal, which puts higher requirements on packaging equipment and packaging materials. In order to achieve this sealing requirement, the transverse seal of the packaging machine must have sufficient pressure and stable temperature.