Air pockets in lamination can be a real problem. If you need to hand out laminated sheets for a project or presentation, you will want them to look as good as possible. Blisters are formed when there isn’t enough tension or if the paper moves too fast through the machine. Better quality lamination machines should put an end to this. If you notice a pattern of blisters, be sure to contact customer support as there may be internal motor issues that can be fixed.