The Kraft Paper (PE Film) Bubble Envelope Machine combines kraft paper with bubble film to make bubble envelopes. This machine uses thermal adhesive to bond two layers of kraft paper to two layers of PE bubble film. The package is then sealed with vertical and horizontal heat sealers, and cut into fixed lengths after cooling. The Kraft Paper (Poly Film) Bubble Envelope Machine combines kraft paper with bubble plastic to produce bubble mailers. This machine uses thermal adhesive to bond two layers of kraft paper with two layers of PE bubble film. The packages are then sealed with vertical and horizontal heat seals, cooled, and cut into fixed lengths.