Today, PET barrier bottles are widely used in the beverage, dairy, wine, pharmaceutical, and chemical industries. This is mainly due to the improvement of their barrier performance solutions. In the PET industry, in order to achieve a satisfactory barrier effect for PET packaging, the barrier properties of PET bottles must be studied and controlled. At present, the following four technologies are mainly used to improve the barrier properties of PET preforms, which are briefly introduced here.
1, PET bottle blank barrier solution - raw material mix
The barrier material is directly mixed in the PET raw material. The advantage is that the mixed material can be processed by a standard preform production system without any other technical measures, and the requirements for the operator are simple. However, there are also disadvantages in that the mixed barrier material tends to lower the transparency of PET and the color is slightly cloudy.
2, PET bottle blank barrier solution - multilayer method
The multi-layer method, also called compound injection molding, involves injecting a PET substrate first, and then injecting a barrier material through the thermal core to form an intermediate barrier layer. This method requires a high level of operator skill and is also strict. Quality control.
3, PET bottle blank barrier solution - multiple injection molding
The method starts with inner injection molding and then performs multi-layer injection molding during parallel processing. In the industry, the multiple injection molding process used to make preforms is more complex, because firstly each layer of the preform must be very thin, but in actual production, the cores may deviate from the center under the pressure difference, and thus cannot Achieve uniform distribution of wall thickness. In addition, when the first molding cycle is completed, the preform body must be transferred to another cavity for the next layer of injection molding. This process is done by rotation, and it is easy to cause delamination between layers. Of course, there are already existing foreign manufacturers to solve this problem. When it is necessary to change the cavity, the rows of cores move in parallel, thereby replacing the rotary motion and also avoiding the risk of stratified delamination.
4, PET bottle blank barrier solution - coating method
That is, the plasma coating is performed on the inside or outside of the blow molded preform or hollow body. This process is usually complicated
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