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Hot Melt Adhesives  

The MCT 300 can measure hot melt adhesives on paper, board and textiles. Hot melt adhesives are typically solvent free thermoplastics, they melt or decrease in viscosity at temperatures in excess of 180o F, then rapidly set upon cooling. They can be repeatedly softened by heating, and hardened by cooling, this property makes them very useful in discontinuous manufacturing processes where one of the 2 substrates may be applied in a separate location. Different polymer systems are used to form hot melts depending upon the application:

Acrylates (hot melt PSA) are used in packaging and construction
Styrenes (SIS and SBS) are used in pressure sensitive applications
Polyamides are used in high strength hot melt adhesive systems
Polyethylene (PE), Polypropylene, and other olefins are used for a variety of applications
Polyurethane (PU) adhesives are used in applications where excellent flexibility and durability
are required.

Measurement of coat weight is important for 2 main reasons: lf wound:
1. Adhesive coating needs to be uniform to provide a high coefficient of adhesion between the two substrates.
2. For cost effectiveness, the aim is to apply the minimum quantity of coat weight in order to achieve adhesion.

Manufacturing Process
Polymer granules are apportioned into an extruder whereupon they are melted, and applied with a doctor blade into the engravings of an engraved roller through a slit die, before being applied to the substrate. Alternatively the molten adhesive is extruded through a slit die onto the substrate at the nip between a pressure roll and a metal chill roller.

Measurement Locations
Measurement is made immediately after the chill roller, on the set adhesive. The gauge should be mounted approximately 8 inches from the surface of the web.

Measurement Performance
Measurement Range % Typical Accuracy %
Hot-melt adhesives 10-50 gsm +/- 0.3 gsm
Application Photos
MCT460   MCT460-WP   MCT460-T   MCT466HD   MCT466SF   MCT466QC   GUARDIAN  
Moisture Transmitter
Tobacco Moisture Transmitter
Wood Products Moisture Transmitter
MCT466 QuikCheck
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Scanning Frame System
Process Sensors Corp.
113 Cedar Street
Milford, MA 01757 USA
Tel: (508) 473-9901
Fax: (508) 473-0715
Process Sensors Europe
Unit 4, Adelaide House
Corbygate Business Park
Corby, Northants NN17 5JG
United Kingdom
Tel: 01536-408066
Fax: 01536-407813
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Ul. Modlinska 310/312 lokal 216
03-152 Warszawa
Tel: (48) 22 6739526
Fax: (48) 22 6739527
Gsm: (48) 509 202759
Process Sensors Asia
PT 3852 Taman Binaraya 3
Off Jalan Pasir Puteh
Limbat, 16150 Kota Bharu Kelantan, Malaysia
Tel: 00-609-765-1352
Fax: 011 60 6601 4588
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