Wireless plastic hot melt adhesive application puzzle

April 22, 2020

The hot-melt adhesive is commonly known as EVA (ethylene-vinyl acetate copolymer). According to the application industry, the formula is slightly different, but the hot-melt adhesive for printing should also be distinguished according to different usage conditions.

1. Should different types of glue be used for binding different paper materials?

For example, binding plain paper or coated paper? Copperplate glue should be used for copperplate paper; wireless glue installation machine for top-mounted glue pot or wireless glue installation machine for bottom-mounted glue pot? For the top-mounted glue pot wireless glue machine, the glue with long opening time should be used.
(Note: The open time of hot melt adhesive refers to the time when the glue is condensed. This time is generally 6-13 seconds.)

2. How long should the books and periodicals finished in glue binding be cut?

The hot melt adhesive should be cut during cooling and hardening. This time should generally be more than 3 minutes. Otherwise, problems such as spine deformation and glue sticking will occur.
(Note: The cooling and hardening time of EVA hot melt adhesive is generally more than 3 minutes)

3. How should the temperature of the glue pot be adjusted?

First of all, according to the technical specifications provided by the hot melt adhesive manufacturer, too high or too low will reduce the bonding strength and tensile strength, so the temperature of the hot melt adhesive must be controlled within a certain range to achieve the best Bonding effect.

In addition, according to the different paper textures, the glue temperature should also be different. For example, the inorganic content in coated paper is about 10 times higher than that of offset paper and writing paper, and the inorganic material has good thermal conductivity, which will accelerate the cooling of the hot melt adhesive. The curing speed, so in this case, the temperature of the glue pot should be increased slightly.

4. What are the requirements for the use environment of EVA hot melt adhesive?

In general, the temperature is maintained at a constant temperature of 20-25 ° C and the humidity is maintained at about 50% to achieve the best binding effect.

5. How long should the books and periodicals in plastic binding be delivered?

Generally, it is delivered immediately at the digital express printing shop. Of course, there is no problem for ordinary use, but it is not allowed to read it vigorously at this time, because the bonding effect of EVA hot melt adhesive reaches its best after 24 hours.

6. What are the reasons for users to drop pages in use?

In addition to the problems mentioned above, it is usually necessary to pay attention to whether the equipment debugging is appropriate and the operation method is correct. Another problem that is easily overlooked is that many rubber blocks are added at one time during the operation, but due to the small amount of work each time, the EVA hot melt adhesive is repeatedly heated and melted, which will destroy the macromolecular chain structure, thereby reducing heat Melt viscosity. This situation is more common in digital express printing shops.

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