The fully automatic edge banding machine is a key equipment for deep
processing of quartz stone boards (home decoration countertops, commercial
counters), responsible for bonding PVC, acrylic and other edge banding strips to
the edges of the board (requiring bonding strength ≥ 1.5MPa, overflow amount ≤
0.5g/m), directly affecting the aesthetics and service life of the board. If the
edge banding is not firmly attached (peel strength<1MPa) and there is severe
glue overflow (over 2g/m), it will cause the edge banding to fall off during
use, and the edge glue to be difficult to clean, resulting in a rework rate of
over 20% for finished products. Based on the high hardness (Mohs 6-7) and
brittle edge characteristics of quartz stone slabs, a three-step inspection
method is summarized to quickly restore the quality of edge sealing.
Step 1: Optimize the glue application system and match the glue type - core
bonding ensures bonding strength
Uneven glue application, mismatched glue types, or abnormal glue rollers are
the main causes of poor adhesion and glue overflow.
Poor compatibility of adhesive types or imbalanced coating amount: ordinary
woodworking hot melt adhesive is used, which has insufficient adhesion with
quartz stone slabs and is prone to detachment in low temperature environments;
If the glue application amount is less than 80g/m, the bonding strength is
insufficient; Above 120g/m, excess glue overflows and forms adhesive buildup.
Replace the special PUR hot melt adhesive for quartz stone (temperature
resistance ≥ 80 ℃, bonding strength ≥ 2MPa), and accurately control the amount
by adjusting the glue application knob to stabilize at 90-110g/m; Install a glue
amount detection device for real-time monitoring and feedback adjustment.
Wear or abnormal temperature of the glue roller: The pattern of the glue
roller is worn by more than 0.2mm, and uneven glue application results in glue
leakage points; The roller surface temperature is below 180 ℃, and the glue does
not melt sufficiently, resulting in poor fluidity; Above 220 ℃, the adhesive
ages and deteriorates, the bonding strength decreases, and it is prone to
overflow. Replace the wear-resistant steel coating roller (with a pattern depth
of 0.5-0.8mm), calibrate the roller surface temperature with a temperature
sensor, and stabilize it at 190-210 ℃; Regularly clean the residual glue on the
roller surface to avoid the influence of glue scale on the uniformity of glue
application.
Step 2: Calibration of pressing parameters and conveying accuracy - precise
control of overflow reducing adhesive
Improper compression pressure, temperature, and conveying speed can
exacerbate edge sealing defects.
Unbalanced pressing parameters: When the pressing pressure is below 0.3MPa,
the edge sealing strip is not tightly attached to the board, resulting in gaps;
Above 0.6 MPa, the edges of quartz are prone to collapse; The temperature of the
pressing wheel is below 50 ℃, the glue cools too quickly, and the bonding is not
firm. Control the compression pressure at 0.4-0.5MPa through a pressure
regulating valve, and use silicone compression wheels (to avoid damaging the
board); Adjust the heating temperature of the pressing wheel to 60-70 ℃ to
extend the adhesive curing and adaptation time.
Fluctuations in conveying speed or positioning deviation: If the conveying
speed is below 3m/min, the adhesive will cool down in advance after coating,
resulting in poor bonding effect; Exceeding 6m/min, insufficient pressing time,
and inadequate bonding; The positioning deviation of the board exceeds 0.5mm,
the alignment between the edge banding and the edge is poor, and there is local
glue overflow. Stabilize the conveying speed at 4-5m/min with a frequency
converter, install an infrared positioning device, calibrate the sheet conveying
trajectory, and control the positioning deviation within ± 0.2mm; Install a
guide baffle at the feeding end to ensure smooth transportation of the
board.
Step 3: Adapt to the characteristics of edge banding and pre-treatment of the
board - avoid defects at the source
Mismatched specifications of edge banding, insufficient edge treatment of the
board, or environmental influences can affect the stability of edge banding.
Mismatching or insufficient pre-treatment of edge banding specifications: The
thickness of the edge banding deviates from the thickness of the board edge by
more than 0.1mm, resulting in uneven height after bonding; The surface of the
edge banding is not polished (roughness Ra<3 μ m), and the adhesion with the
adhesive is insufficient; The material used is ordinary PVC, which has poor
weather resistance and is prone to aging. Select edge banding with a deviation
of ≤ 0.05mm from the thickness of the board, and use a sand belt machine to
polish the surface in advance (Ra3-5 μ m); Prioritize the use of acrylic edge
banding, suitable for quartz stone board usage scenarios.
Defects on the edge of the board or abnormal environmental humidity: There
are broken edges and burrs (with a depth exceeding 0.2mm) on the edge of the
board, and there are gaps after bonding; The humidity in the workshop exceeds
60%, which slows down the curing speed of the glue and makes it easy to
overflow; Below 30%, the glue quickly solidifies and the bonding is
insufficient. Before edge sealing, use a chamfering machine to chamfer the edges
of the board at 0.5 × 45 ° to remove burrs and chipping; Install
dehumidification/humidification equipment to control the humidity in the
workshop at 40% -50%, ensuring that the glue solidifies properly.
Daily maintenance should pay attention to: checking the amount of glue
applied, pressing pressure, and rubber roller temperature every day; Clean the
adhesive system and calibrate the conveying accuracy every week; Replace aging
rubber hoses and inspect the wear of compression wheels every month; Optimize
the matching parameters of adhesive type and edge banding every quarter. By
taking the above measures, the bonding strength of the edge can be increased to
over 1.8MPa, the overflow amount can be reduced to below 0.3g/m, and the
qualified rate of the finished product can be increased to 98%. If there are
still problems, it is recommended to contact the manufacturer to optimize the
coating and pressing structure, and match the edge sealing requirements of
quartz stone boards.