- The problem of plastic packaging and paper cards not sticking together is a common issue in the vacuum forming industry, and it is related to several factors, including the process of applying plastic oil, the quality of the blister packaging, and the heat sealing process.
- In most cases, the problem is caused by improper plastic oil application process, and different types of plastic oil are required for PET and PVC blister packaging. Therefore, using the wrong type of plastic oil can also lead to poor adhesion.
- If the paper used is too rough, the plastic oil applied to the surface may be absorbed by the paper, which can result in a lack of plastic oil on the surface and the inability to stick to the blister packaging.
- Some blister packaging is coated with a layer of silicone oil to facilitate demolding and packaging, but this layer of silicone oil may prevent the blister packaging and paper cards from sticking together.
- When heat sealing the paper cards and blister packaging together, if the sealing temperature is not high enough, it can also cause poor adhesion.
To solve this problem, it is best to use a process of elimination. You can try using blister packaging and paper cards that have been successfully sealed to identify which factor is causing the issue. Then, you can check the plastic oil application process, the quality of the blister packaging and paper, the presence of silicone oil layer, and the heat sealing temperature to identify the root cause of the problem.