6-26
Troubleshooting
13. Hot melt material
application problems
(continued)
.
Problem
Container Pops
Open After
Leaving
Compression
Section
Possible Reason
Adhesive not cooling fast enough
Open time of adhesive too long
Adhesive cooling too fast
Open time of adhesive too short
Shearing of adhesive deposit
lnsuff icient compression force
lnsuff icient hot tack
Corrective Action
(Any or all) Decrease bead size,
decrease adhesive temperature
slightly, increase distance between
nozzle and substrate, increase
distance between bead deposit and
bead compression, increase length of
compression section, reduce line
speed through compression section,
cool the substrate, use a lower
flow-rated nozzle, or use stitched
bead pattern
Use an adhesive with a shorter open
time, or reduce application
temperature slightly
(Any or all) Increase bead size,
increase adhesive temperature
slightly, decrease distance between
nozzle and substrate, shorten
distance between bead deposit and
bead compression, heat the
substrate, use a higher flow-rated
nozzle, increase bead length and
avoid stitched bead pattern, or protect
bead deposit and/or gun from cold or
moving air
Use an adhesive with a longer open
time, or increase application
temperature slightly
Check for twisting,
compression/relaxing/more
compression or other adverse
movement in the compression
section. If movement through
compression section is smooth,
check with adhesive manufacturer
Increase compression force as
required
Change to new batch or different
formulation of adhesive
.
Refer to
PM 106701A
41.23OOSP- l/94
0 Nordson Corporation 1994
All Rights Reserved
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