Hot melt coating technology, technique, and more. For further informative articles visit www.slotdies.com and click on technical content. To receive the most recent articles and blog posts in your inbox please subscribe to our e-mail list.

1. HOT MELT COATING TECHNOLOGY

2. BACKGROUND
• Hot Melt Adhesives
• Process Techniques
• Equipment Systems
• Consistent
• Streak-free
• High Speed

3. HOT MELT ADHESIVES
• Polymeric Materials
• Elevated Temperatures
• Bond to Substrate
• PSA
o gels
• versus Solvent

4. HOT MELT PROCESS
• Adhesive Mixing/Mastication
• Melting/Pumping
• Coating Head
• Curing
• Web Handling & Controls

5. LIMITATIONS
• Speed
3280 feet/min (1000 meters/min)
• Thin
0.5 mil (0.0127 mm)

6. TECHNOLOGY AND TECHNIQUE
• Hot Melt Adhesive Rheology
• Technology
o Coating Head
o Backing Roll
o Adhesive Delivery System
o Substrate
o System Control
• Technique

7. HISTORY
• from Compliant Rubber Roll
• to Chrome Roll
o Relationship between die and roll
o Thinner coatings & gels
• to Rubber Roll

8. TECHNOLOGY AND TECHNIQUE
• Rubber Roll Technology
o TIR < 0.0003 inch (0.00762 mm)
o Cylindricity < 0.0005 inch (0.0127 mm)
o “Compliant Steel”
o 80-90 Shore A Durometer

9. Rubber Roll Technology
TECHNOLOGY AND TECHNIQUE

10. TECHNOLOGY AND TECHNIQUE
• Rotary Rod Die Technology
o Gel passage through physics
o Roll deflection up to 1 mil (0.0254 mm)
o Slip creates streak-free coating

11. TECHNOLOGY AND TECHNIQUE
• Adhesive Delivery System
o Constant, pulse-free delivery
o Stable temperature
• Web Control System
o Tension
o Process Speeds
o Chatter control

12. CONCLUSION
• Best Techniques
+
• Good Technology
=
• Best Product
Thinner, Faster, and the State of the Art
• Rotary Rod Die and Rubber Backing Roll
o Precision of manufacturing
o Adhesive Memory