Wireless adhesive hot melt adhesive application
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Hot melt adhesive is a common name for EVA (ethylene-vinyl acetate copolymer). The formulation is slightly different depending on the industry used, but the same hot melt adhesive for printing should also be differentiated according to different usage conditions.
1. Should you use different types of glue to bind different papers?
For example, binding plain paper or coated paper? Copper plate paper should use copper plate glue; top-mounted glue pot wireless glue machine or bottom-mounted glue pot wireless glue machine? The top-loading capsule wireless binding machine should use a glue with a long open time.
(Note: The opening time of hot melt adhesive refers to the time when the glue is condensed. This time is usually 6-13 seconds.)
2. How long should the book that has been glued finished be placed before cutting?
It should be cut in the cooling and hardening of hot melt adhesive. This time should be guaranteed to be more than 3 minutes, otherwise there will be problems such as spine deformation and adhesive sticking.
(Note: The cooling hardening time of EVA hot melt adhesive is generally more than 3 minutes)
3. How should the temperature of the gel 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 bond 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, depending on the texture of the paper, the glue temperature should also be different. For example, the inorganic content in the 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 this situation should increase the temperature of the gel slightly.
4. What are the requirements for the use environment of EVA hot melt adhesive?
In general, the temperature is kept at 20-25 °C and the humidity is kept at about 50% to achieve the best binding effect.
5. How long will it take for the finished book to be delivered?
Usually in the digital fast printing shop is delivered immediately, of course, as a general use is no problem, but at this time can not be vigorously flipped, because the bonding effect of EVA hot melt adhesive is best after 24 hours.
6. What are the reasons why users have dropped pages during use?
In addition to the problems mentioned above, it is usually necessary to pay attention to whether the equipment is properly debugged and the operation method is correct. Another problem that is easily overlooked is that a lot of rubber blocks are added at one time in the operation, but because of the small amount of work each time, the EVA hot melt adhesive is repeatedly heated and melted, which will destroy the macromolecular chain structure and thus reduce the heat. The viscosity of the melt. This situation is more common in digital fast printing shops.