Cold Glues are water-based solutions. The adhesive solids are dissolved in water, usually by cooking. A bond is formed when almost all of the water is lost via penetration or absorption into substrates. To create a solid bond, it requires 2 absorbent surfaces. There are three main types of cold glue adhesives:
1. Starch– A white/off-white opaque solution, usually low in solids
2. Dextrine– Depolymerized starches, usually tan to dark brown in color (pyrolysis), which enhance solubility, increase wet tack, lower viscosity and/or increase solids, and improve solution viscosity stability.
3. Polyvinyl Alcohol solutions (PVOH)– A synthetic water soluble adhesive or intermediate, Translucent. The dry film it leaves can be water sensitive or water resistant.
- Excellent penetration
- Excellent wet tack and tack range
- Excellent final adhesion to regular stocks
- Excellent heat and cold resistance
- Easy to clean up with excellent machining characteristics
- Storage conditions not critical – freeze/thaw stable
- Low price per wet pound – raw material related
- Slow setting speed
- Poor adhesion to difficult surface
- Caution required when diluting
- Must be protected from bacterial and fungal attack
Deciding on the right adhesive is necessary for correct application. For assistance, contact us today.