Bubbles Between Paper and Board
Air bubbles trapped between the decorative paper and substrate is one of the most common lamination defects. This is usually caused when insufficient pressure is applied to an area, or if the adhesive has been spread unevenly or air was not properly removed during lamination.
Solution: Adjust roller pressure, ensure glue is applied evenly in sufficient amounts, and smooth feeding to avoid trapped air.
Wrinkles and Paper Creasing
Uneven feeding of decorative paper or improper tension control may cause wrinkles during production. Misaligned reels and unstable conveyance systems can cause warpage as well.
Correction : Mis-charges in the tension control and lead to misalignment of paper rolls in reel fed tenders,need to be corrected by ensuring that they are properly aligned and controlled or fed at a steady rate during production run.
Poor Adhesion and Delamination
When paper separates from the board after lamination, the problem is usually insufficient adhesive, low pressing pressure or contaminated surfaces or improper drying conditions.
Our Fix: Increase adhesive coverage if required, clean substrate surfaces before production, and check that clear pressing rollers provide enough bonding pressure.
Glue Marks on the Surface
When too much adhesive is applied, glue lines or stains may show upm or dark paper & light veneer composite surfaces will be uneven in their appearance because the surface is completely watered down.
There are some common solutions to optimize glue coating weight, some of them are regular inspections of the glue rollers together with an adhesive system right viscosity.
Edge Lifting After Lamination
Wear on the Thin Liner or even paper lifting at the edges can occur if not enough glue is applied close to the panel edge or when processing a product before the adhesive settles properly.
Solution: Achieve full-panel-width adhesive coverage and provide sufficient bonding time before stacking or further processing.
Uneven Surface Appearance
Inconsistent pressure, temperature or adhesive application can lead to changes in gloss, texture or color uniformity.
Rollers misalignment, faulty glue application equipment, and unstable operating parameters all should be avoided regularly to fix these issues.
Paper Tearing During Production
When too much tension is applied or in cases when the paper quality was not consistent, decorative paper can tear. This can also be linked to damaged guide rollers.
Solution: Minimize the tension of the paper, specially check for wear and tear in selector rollers, chose decorative papers suitable for high-speed production.
Preventing Lamination Defects
The most effective way to minimize lamination defects when producing sandwich panel wall systems is through regular machine maintenance, proper operator training as well as stable production parameters and high-quality raw materials. A paper sticking machine, when operated flawlessly, can help enhance the quality of the products while also reducing wastage and increasing production.
