Precautions for EVA Hot-Melt Adhesives
May 20, 2026
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Unlike standard cold glues, EVA hot-melt adhesives have specific characteristics that require attention to the following points during use:
1. Understand and master the various grades and technical specifications (including technical parameters) of EVA hot-melt adhesives. Different grades have different open times and curing times; it is particularly important to strictly distinguish between "summer-grade" and "winter-grade" adhesives, as ambient temperature affects these times.
2. Never heat EVA hot-melt adhesive directly with an open flame. Use a jacketed oil-heating system or a sealed electric heating plate instead.
3. Solid EVA adhesive must be properly preheated in a preheating unit before being transferred to the working glue reservoir for application. A preheating time of approximately two hours is generally recommended. Do not add solid adhesive blocks (unpreheated adhesive) directly into the working reservoir; doing so can impair flowability or result in incompletely melted adhesive being applied to the book spine, leading to uneven application and compromising the book's visual quality.
4. Control the quantity of adhesive in the preheating pot appropriately. Excessive amounts lead to repeated melting cycles, causing the adhesive to degrade and age, reducing viscosity and compromising bonding strength.
5. The entire bonding process must be completed within the adhesive's open time. In the event of a machine stoppage due to a malfunction, promptly remove the books from the clamps; pay special attention to ensure that no book blocks remain positioned above the glue application roller.
6. When performing prolonged repairs on perfect binding equipment, turn off the preheating pot and the working glue reservoir to prevent adhesive degradation.
7. Strictly maintain the temperature of the molten adhesive within the specified operating range.
8. Regularly clean the preheating pot and the working glue reservoir. Keeping the pots clean prevents the accumulation of impurities, which could otherwise affect temperature control accuracy or even cause thermostat failure and adhesive combustion. Under normal production conditions, the preheating pot should be cleaned every three months, and the working glue reservoir (used for application) should be cleaned every two weeks. Establish a formal cleaning schedule to ensure compliance.
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