6 commonest factors that affect the quality of edge banding
6 Commonest Factors that Affect the Quality of Edge Banding
Problems
of edge banding machines are usually caused by its special function and
structure, and there are many factors that affect its quality during
processing. Concerning edge banding machine’s function and structure, it
must not only protect the edges of workpiece, seal the edge well and
reduce workpiece deformation, but also for beautiful outlook. To make
perfect edge, the machine need to ensure that the edge banding strips
are bonded to the edge of the board and be firm and flat, also need to
ensure that there is no exposed part, chipped edge, or large gap at the
joint between the edge-sealed surface and the other sides, to be
natural, smooth and fast.
The quality problems of the edge
sealing of plate-type workpieces are mainly caused by cutting of the
glue seam and the edge banding strips. The bonding strength, size of the
glue seam and residual amount of glue on the edge are common problems
of the glue seam quality; the edge cracks, scratches, surface damage of
the edge are common cutting quality problems. There are various factors
affecting the quality of edge banding process, which can be roughly
summarized as:
1, Equipment Problem
Because the engine of the
edge banding machine and the track cannot cooperate well, the track is
unstable during operation, then the edge banding strips will not fit the
edge perfectly. the lack of glue or uneven coating are often caused by
gluing pressure rod that does not cooperate well with the conveyor chain
pad. If the trimming tools and the chamfering tools are not adjusted
properly, not only requiring extra labor working, and the quality of
trimming is difficult to guarantee.
In short, due to the poor level
of equipment commissioning, repairs and maintenance, quality problems
will last. The blunt of the cutting tools also directly affects the
quality of the ends and trimming. The trimming angle given by the
equipment is between 0 ~ 30 °, and the trimming angle selected in
general production is 20 °. The blunt blade of the cutting tool will
cause the surface quality to decrease.
2, The Workpiece
The
man-made wooden as the material of workpiece, the thickness deviation
and the flatness may not reach the standards. This makes the distance
from the pressure roller wheels to the surface of the conveyor difficult
to set. If the distance is too small, it will cause too much pressure
and separate of the strips and workpiece. If the distance is too large,
the plate will not be compressed, and the strips cannot be banded firmly
with the edge.
3, Edge Banding Strips
The edge banding strips
are mostly made of PVC, which can be greatly affected by the
environment. In winter, the hardness of PVC strips will increase which
causes the adhesion for the glue decreases. And the longer storage time,
surface will age; the adhesive strength to the glue is lower. For paper
made strips with a small thickness, due to their high toughness and low
thickness (such as 0.3mm), will cause the uneven cuts, insufficient
bonding strength, and poor trimming performance. So problems such as
large waste of edge banding strips and high rework rate are serious.
When
thick edge banding strips are used, the pressure rod for strips should
be adjusted tightly to the optimal position. The most common fault is
over-tightening. Because the strips are slightly longer than the
workpiece, give the vertical force on edge banding strips. At this time,
because the glue is not completely cured, the bonding strength is not
enough, and the end of workpiece is easy to lose.
4, Adhesive
The
amount of glue applied to the edge is related to the type,
concentration, viscosity of the adhesive and the surface roughness of
the edge. The glue should be applied evenly and no air bubbles. Due to
the low temperature in winter, the temperature of the glue should be
slightly higher in order to ensure the bonding strength. If it is too
hot, exceeding 190 ° C, the chipping board of the edge banding machine
is easy to break. Once this happens, the glue layer becomes thin. When
cutting the strips, the glue has already cooled down, and the stripes
temperature is also low, resulting in a significant decrease in bonding
strength.
If the temperature drops to 170 ° C, the glue is a little
thicker, but the temperature of the strips are lower, and the glue and
bonding strength are not enough. When the temperature is lower than 170°
C, the glue will not melt well.
5, Room Temperature and Machine Temperature
When
the indoor temperature is low, the workpiece passes through the edge
banding machine, its temperature cannot be increased quickly, and at the
same time, the adhesive is cooled too quickly which is hard to complete
the bonding. Therefore, the indoor temperature should be controlled
above 15 ° C. If necessary, the parts of edge banding machine can be
preheated before working (an electric heater can be added at the
beginning of edge banding process). At the same time, the heating
display temperature of the gluing pressure rod must be equal to or
higher than the temperature which the hot melt adhesive can melt
completely.
6, Feeding speed
The feeding speed of modern
automatic edge banding machines is generally 18 ~ 32m / min. Some
high-speed machines can reach 40m / min or higher, while the manual
curve edge banding machine has a feeding speed of only 4 ~ 9m / min. The
feeding speed of the automatic edge banding machine can be adjusted
according to the edge banding strength. If the feeding speed is too
high, although the production efficiency is high, the edge banding
strength is low.
RicoCNC supplies a range of spare
replacement parts for edgebanders, such as pressure wheels, trackpads,
buffing wheels, scraping insert knife, spindle motor, mechanical
position indicator counter, side support rollers, etc. Except Chinese
brands edgebanders, most European edgebanders and USA edgebanders can
get spare parts here, such as Biesse, SCM, IMA, Homag, Laguna, etc. Keep
some spare parts for easy replacement is great for edgebanding
troubleshooting. Welcome your inquiry.
online service
0086-15264185266
cncsale@ricocnc.com
Skype: ccsalce
QQ