Cold press problems & solutions
Cold pressing is one of the most common methods for press-
ing laminates and veneers. Listed below are six common
problems and possible solutions.
1Total delamination with little or no substrate failure. Probable causes: ( 1) pre-cure (no glue trans-
fer); ( 2) low pressure (poor contact); 3) short press time.
Solutions: ( 1) Increase glue spread; ( 2) Increase pressure; ( 3)
Increase pressure period.
2Spotty bonds. Probable causes: ( 1) uneven surfaces; ( 2) worn spreader rolls. Solutions: ( 1) calibrate cores to
uniform thickness and/or increase pressure; ( 2) replace or
3Glue bleeds through the face veneers. Probable causes: ( 1) excessive glue spread; ( 2) excessive pressure;
( 3) wrong adhesive type. Solutions: ( 1) Reduce the glue
spread; ( 2) reduce the pressure; ( 3) consult your supplier.
4Telegraphing of core defects or banding. Prob- able causes: ( 1) excessive pressure; ( 2) uneven or variable
thickness; or ( 3) foreign material on the core. Solutions: ( 1)
reduce the pressure; ( 2) re-sand the core; and ( 3) pre-clean
5Warpage of panels. Probable causes: ( 1) excessive or unequal adhesive spread; ( 2) high moisture content;
( 3) unbalanced construction. Solutions: ( 1) reduce the adhesive spread and/or make sure the top and bottom spread are
equal; ( 2) maintain a 6-8 percent moisture content in the material; ( 3) check the grain orientation and number of plies.
6Brilliant white on glue squeeze-out and/or glue line. Probable cause: ( 1) chalking caused by low
temperature. Solution: ( 1) Raise temperature of plant, wood
and adhesive above minimum use temperature of adhesive.
Source: Franklin Adhesives & Polymers. For more information call 800-
877-4583 or visit FranklinAdhesivesAndPolymers.com.
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