Chapter 2
Safety Instructions
Page 12 DM55 DynaDrum PP V6, Manual No.21-18, Rev.2.19
2. Assure the entire adhesive delivery system is sealed from the environment to the
greatest extent possible to prevent moisture-related adhesive cross-linking.
3. Assure all air is evacuated from the adhesive delivery system as soon as possible
after it has been introduced (i.e., when changing hoses, replacing filters, changing
adhesive supplies, etc.) to prevent moisture-related cross-linking.
4. The ITW Dynatec equipment should not be left dormant (sealed at ambient
temperature) with PUR inside for longer than recommended by your adhesive
manufacturer. The ITW Dynatec system, especially applicators and nozzles, should be
thoroughly purged of adhesive using a PUR purge material if the system will be left
dormant for extended time periods.
5. HMPUR viscosity increases the longer it remains molten within a system and can
cross-link due to temperature exposure. Assure the molten adhesive does not sit
within the ITW Dynatec equipment at operating temperature for more than a
cumulative total of 2 to 4 hours. Utilization of the Temperature Standby feature will
ensure a temperature drop occurs automatically.
6. Turn off any gear pumps in the system if it will not be used for a period of five minutes
or more. Doing so will reduce potential glue degradation.
7. When using spray applicators, the nozzles must be thoroughly cleaned on a regular
basis to prevent the adhesive from cross-linking inside or on the surface of the air
passageways.
8. The adhesive applicators must be either fully sealed or thoroughly cleaned with PUR
purge material if the system is to be idle for more than two hours. Otherwise, HMPUR
adhesive present in the exposed orifices of the applicator could potentially cross-link,
clogging them.
9. Recommended adhesive application temperatures should never be exceeded. Higher
application temperatures may result in higher adhesive viscosities and thermal-related
cross-linking.
10. The use of air dryers such as ITW Dynatec PN 117944 or 117974 are recommended
in humid environments.
There are many advantages to using HMPURs. However, the proper handling of these
unique adhesives is imperative to assure success without damage to equipment or injury
to personnel. ITW Dynatec equipment has been engineered to minimize the effort
required to assure safe and proper handling of HMPURs.
ALLOWING PUR ADHESIVE TO CURE IN A UNIT OR ITS COMPONENTS VOIDS ITW
DYNATEC’S WARRANTY.
Please consult with your ITW Dynatec representative to discuss these topics in further
detail, if necessary.
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