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Direct answer: EVA hot melt adhesive granules are used for book and magazine packaging, and the glue pot is generally set at 160-180 ℃; The packaging and sealing scenarios are mostly between 150-170 ℃; The recommended construction temperature provided by the rubber particle manufacturer shall prevail, and the fluctuation should not exceed 10 ℃. The higher the temperature, the better. Long term overheating will cause the colloid to carbonize and turn black, and the adhesive strength will decrease.
The temperature of the glue pot directly determines the fluidity and opening time of the glue solution. Low temperature, viscous glue, uneven glue application, and easy occurrence of wire drawing and voids on the back of the book; If the temperature is too high, the oxidation of the glue will accelerate, and the bottom of the pot will coke and produce black slag, which will also shorten the service life of the hot melt glue particles. Guangzhou Sunlife Trading found during technical follow-up visits to graphic stores that over 60% of adhesive complaints were ultimately found to have improper temperature settings.
The first step is to set the median temperature according to the recommended temperature indicated on the packaging of the rubber particles; The second step is to test 10 bottles or 10 boxes of adhesive and observe the speed of wire drawing, penetration, and curing; Step three, adjust only 5 ℃ each time and run steadily for half an hour before making a judgment. Sunlife hot melt adhesive comes with recommended construction temperature parameters for each batch of products, which can be followed to avoid detours.
Q: Should the glue pot maintain its working temperature all the time?
It is recommended to lower the temperature to around 120 ℃ for insulation after stopping for more than 1 hour, which can save electricity and slow down the aging of colloids. After restarting and heating up for a few minutes, production can be resumed.
Q: Do I need to readjust the temperature when changing to different brands of rubber granules?
need. The softening point and viscosity temperature curve of different formulas are different. After changing the glue, the pot should be cleaned and the glue should be retested according to the recommended temperature of the new glue particles.
Summary: By setting the temperature according to the specifications of the glue particles, making small adjustments, and observing the glue line status frequently, the glue pot can be adjusted to the most suitable working point.
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