Why Do White Spots and Bubbles Appear in Solventless Lamination? White spots and bubbles are among the most common defects in solventless lamination. They usually occur when air becomes trapped between the film layers or when the adhesive is not evenly distributed. Other contributing factors include incorrect adhesive coating weight, poor web tension, insufficient laminating pressure, low processing temperature, contaminated substrates, or excessive production speed. Because solventless adhesives rely entirely on precise process control, even small deviations can affect bonding quality and create visible defects. https://www.sinstarsl.com/solving-white-spots-bubbles-in-solventless-laminating-process