Table 3 Defects and improvement methods in the gluing process
Defect name generation cause improvement method
Large open rubber corner degumming
1 The adhesive deteriorates.
2 The adhesive layer is insufficiently cured.
3 The glue has too much moisture.
4 The glue on the corners is dry.
5 Corner lacks glue.
6 The moisture content of the veneer is too high.
7 The slab corners of each grid are not aligned or the slab is tilted when the press is pressed, and the pressure is uneven.
8 The hot platen temperature is too low or part of the temperature is uneven.
9 The hot plate has been warped, resulting in low corner adhesion.
1 Replace the compound.
2 Extend the glue time.
3 Use a formula with low water content.
4 If the aging time exceeds the regulations, the aging time should be shortened.
5 Glue and pay attention.
6 Improve the drying quality and prolong the hot pressing time.
7 Pay attention to the correctness of the plate loading operation so that the pressure of each part is consistent.
8 Check the hot plate and steam supply.
9 Overhaul or heat exchange platen.
Bubbling and partial degumming
1 After the core plate is glued, the water content is high and the pressure drop is too fast.
2 The glued veneer is covered with water or the resin is not condensation enough.
3 The hot pressing time is insufficient.
1 When depressurizing, please pay attention to the pressure before the pressure drops to zero, slowly deflate, remove the water, prevent the gas from screaming.
2 Check the resin quality.
3 The hot pressing time is slightly extended.
Low adhesive strength does not meet the standard
1 The quality of the glue deteriorates.
2 The hot pressing time is insufficient or the temperature of the middle layer of the hot plate is insufficient.
3 The moisture content of the veneer is too high.
4 Insufficient amount of glue or foam.
5 The viscosity of the glue is too small to penetrate too much wood.
6 The quality of the veneer is poorly cut, the back crack is deep and the burr groove is more, and the rubber layer is lacking in glue.
1 Change the glue.
2 Increase the hot pressing time or increase the hot plate temperature.
3 Pay attention to the dry quality, and the moisture content is required to be 8% to 12%.
4 Pay attention to the quality of the glue.
5 Check the quality of the glue.
6 Improve the quality of the rotary cutting, requiring a smooth surface and a small back crack.
Core lamination
1 The core plate is not finished, and the core is manually arranged. After the core plate is coated with rubber, the expansion gap is not known.
2 When the board is installed, the core board moves wrongly.
3 The edge of the core board is not straight.
4 The edge of the core has a ruffle or a split.
1 Grasp the expansion rate after the core board is glued, leave a proper gap, and put the rubber core board for a suitable time.
2 When installing the board, be careful not to shift the core board.
3 Before the glue is applied, the edge of the core board is straight.
4 Improve the core cutting quality and drying quality.
Panel laminate seam
1 Patchwork veneer split or debonded seam.
2 The trimming head adhesive paper is peeled off.
3 single board warping drum big bubble (tight side) or ruffled edge (loose side)
1 Improve the quality of seams.
2 Do not use a veneer board.
3 Check the installation status of the knife door pressure gauge to improve the quality of the single-plate rotary cutting.
Board surface
1 The glue is too thin.
2 The glue contains too much water.
3 The amount of glue applied is too large.
4 The crack on the back of the board is too deep.
5 The moisture content of the veneer is too high.
6 After the slab is glued, the placement time is insufficient.
7 The hot platen pressure is too high.
1 Check the viscosity of the glue.
2 Improve the content of the glue resin, and choose a formula with less water content.
3 Reduce the amount of coating and check if the applicator roller is excessively worn.
4 Improve the quality of the veneer's rotary cutting, adjust the vertical height of the pressure gauge and the gap between the knife door, and increase the pressing force of the pressure gauge.
5 Reduce the moisture content of the veneer and keep it at 6% to 12%.
6 Extend the time to allow a part of the water to evaporate.
7 Check the press pressure gauge.
Defect name generation cause improvement method
Large open rubber corner degumming
1 The adhesive deteriorates.
2 The adhesive layer is insufficiently cured.
3 The glue has too much moisture.
4 The glue on the corners is dry.
5 Corner lacks glue.
6 The moisture content of the veneer is too high.
7 The slab corners of each grid are not aligned or the slab is tilted when the press is pressed, and the pressure is uneven.
8 The hot platen temperature is too low or part of the temperature is uneven.
9 The hot plate has been warped, resulting in low corner adhesion.
1 Replace the compound.
2 Extend the glue time.
3 Use a formula with low water content.
4 If the aging time exceeds the regulations, the aging time should be shortened.
5 Glue and pay attention.
6 Improve the drying quality and prolong the hot pressing time.
7 Pay attention to the correctness of the plate loading operation so that the pressure of each part is consistent.
8 Check the hot plate and steam supply.
9 Overhaul or heat exchange platen.
Bubbling and partial degumming
1 After the core plate is glued, the water content is high and the pressure drop is too fast.
2 The glued veneer is covered with water or the resin is not condensation enough.
3 The hot pressing time is insufficient.
1 When depressurizing, please pay attention to the pressure before the pressure drops to zero, slowly deflate, remove the water, prevent the gas from screaming.
2 Check the resin quality.
3 The hot pressing time is slightly extended.
Low adhesive strength does not meet the standard
1 The quality of the glue deteriorates.
2 The hot pressing time is insufficient or the temperature of the middle layer of the hot plate is insufficient.
3 The moisture content of the veneer is too high.
4 Insufficient amount of glue or foam.
5 The viscosity of the glue is too small to penetrate too much wood.
6 The quality of the veneer is poorly cut, the back crack is deep and the burr groove is more, and the rubber layer is lacking in glue.
1 Change the glue.
2 Increase the hot pressing time or increase the hot plate temperature.
3 Pay attention to the dry quality, and the moisture content is required to be 8% to 12%.
4 Pay attention to the quality of the glue.
5 Check the quality of the glue.
6 Improve the quality of the rotary cutting, requiring a smooth surface and a small back crack.
Core lamination
1 The core plate is not finished, and the core is manually arranged. After the core plate is coated with rubber, the expansion gap is not known.
2 When the board is installed, the core board moves wrongly.
3 The edge of the core board is not straight.
4 The edge of the core has a ruffle or a split.
1 Grasp the expansion rate after the core board is glued, leave a proper gap, and put the rubber core board for a suitable time.
2 When installing the board, be careful not to shift the core board.
3 Before the glue is applied, the edge of the core board is straight.
4 Improve the core cutting quality and drying quality.
Panel laminate seam
1 Patchwork veneer split or debonded seam.
2 The trimming head adhesive paper is peeled off.
3 single board warping drum big bubble (tight side) or ruffled edge (loose side)
1 Improve the quality of seams.
2 Do not use a veneer board.
3 Check the installation status of the knife door pressure gauge to improve the quality of the single-plate rotary cutting.
Board surface
1 The glue is too thin.
2 The glue contains too much water.
3 The amount of glue applied is too large.
4 The crack on the back of the board is too deep.
5 The moisture content of the veneer is too high.
6 After the slab is glued, the placement time is insufficient.
7 The hot platen pressure is too high.
1 Check the viscosity of the glue.
2 Improve the content of the glue resin, and choose a formula with less water content.
3 Reduce the amount of coating and check if the applicator roller is excessively worn.
4 Improve the quality of the veneer's rotary cutting, adjust the vertical height of the pressure gauge and the gap between the knife door, and increase the pressing force of the pressure gauge.
5 Reduce the moisture content of the veneer and keep it at 6% to 12%.
6 Extend the time to allow a part of the water to evaporate.
7 Check the press pressure gauge.
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