Common defects Problems and inspection Solutions of HPL  laminates

Common defects Problems and inspection Solutions of HPL  laminates

 

 

 

  1. There are white flowers on the surface of the laminates .

 

Causes: insufficient glue content of surface paper or partial resin curing in drying; low volatile content of surface paper; uneven hot-pressing pressure; inelastic cushion materials; uneven stainless steel plate; too old resin reaction, too large molecule, resin fluidity.

 

Solutions: increase the resin content of surface paper or control the drying temperature to prevent local resin curing; increase the volatile content of surface paper; overhaul the hot press to improve the uniformity of pressure surface; periodically replace cushion materials; periodically Polish Stainless Steel plate; resin should be analyzed and tested, and stop using when the unqualified index is required.

 

  1. There are wet flowers (water vapor) on the laminates surface, and the edge is more serious.

 

Causes: high volatile content of dipping paper after drying; improper solvent used for printing wood ink or dyes; moisture absorption of dipping paper after drying.

 

Solutions: to reduce the volatile content of dipping paper after drying; to change the solvent used in ink (dye); to pay attention to the storage of film paper, generally can be covered with plastic cloth.

 

  1. Surface cracking of decorative laminates

 

Reasons: too tender resin reaction, too small molecule; incomplete resin curing; high glue content of surface film paper.

 

Solutions: stop using unqualified resin; properly increase the hot pressing temperature or prolong the hot pressing time; control the glue content of the surface film paper.

 

  1. Decoration Panel Layering

 

Causes: too low volatile content of film paper, local resin curing of film paper during drying; insufficient resin content of film paper; too low pressure or insufficient hot pressing time; impurities between film paper

 

Solutions: control volatile content should not be too low, drying temperature should not be too high, time should not be too long, prevent local curing of resin; increase the glue content of film paper; properly increase pressure and prolong heating time; pay attention to clear impurities when laying the mould.

 

  1. Warpage of Decoration laminates

 

Reasons: the thickness of base paper is not uniform; the glue content of film paper is not uniform, and the pressure is not uniform everywhere; during the pressing process, the heat preservation can not be fully cooled.

 

Solution: all kinds of base paper should meet the process requirements; keep the resin concentration uniform, adjust the gap between the extrusion roll shaft; cooling to below 50 degrees to carry out pressure relief.

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