How many issues should be noted when using EVA hot melt adhesive?

Do you use different types of hot melt adhesives to bind different types of paper?

Sure, ordinary paper can be bound with ordinary hot melt adhesive and copperplate paper adhesive. Copperplate paper adhesive needs to be bound with copperplate paper; The glue pot of the wireless glue installation machine should use glue that has been open for a long time.

(Note: The opening time of hot melt adhesive refers to the time when the glue solidifies, which is generally 6-13 seconds.). ）

2.  How long should finished books be stored before cutting?

Cutting should be carried out during the cooling, hardening, and forming process of hot melt adhesive. Generally, this time should be kept at least 3 minutes, otherwise problems such as spine deformation and adhesive sticking may 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 tank be adjusted?

Firstly, the technical specifications provided by the Sunlife hot melt adhesive manufacturer must be followed. Too high or too low will reduce the adhesive strength and tensile strength. Therefore, the temperature of the hot melt adhesive particles must be controlled within a certain range to achieve adhesion.

In addition, the temperature of the adhesive should vary depending on the quality of the paper. For example, the inorganic content in copperplate paper is about 10 times higher than that in adhesive paper and writing paper. Inorganic substances have good thermal conductivity and can accelerate the cooling of hot melt adhesive particles;. The curing speed, so in this case, the temperature of the glue pot should be slightly increased.

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

In general, maintaining a temperature of 20-25 ℃ and a humidity of around 50% can achieve the bonding effect.

5、 How long does it take for books and magazines to be delivered for use?

Usually shipped immediately at a digital printing store. Of course, there is no problem with regular use, but don’t read too much at this time because the bonding effect of EVA hot melt adhesive is only achieved after 24 hours.

6、 What are the common reasons for users to drop pages during use?

In addition to the issues mentioned above, it is usually necessary to pay attention to whether the equipment debugging is appropriate and whether the operation method is correct. Another easily overlooked issue is the addition of many adhesive particles at once during the operation process. However, due to the small workload each time, repeated heating and melting of EVA hot melt adhesive can damage the structure of the macromolecular chain and reduce heat generation. The viscosity of the melt. This situation is quite common in digital printing shops.

7、 Can edge glue and back glue be mixed?

Not recommended for mixed use. The fluidity of edge glue is higher than that of backing glue. Using edge glue as backing glue will make the book’s backing glue uneven and prone to empty glue. Back glue cannot be used as edge glue either.

8、 Why does transparent adhesive turn yellow?

Excessive temperature and prolonged repeated heating can cause the glue to turn yellow.

Solution: Reduce the temperature of the adhesive tank. When using hot melt adhesive particles at once, do not add too much. Use according to the amount and dosage, and if it is not enough, add more.