UV glue

UV glue is a material commonly used for bonding or filling in the industry. In the manufacturing process, the curing of UV glue is a very important part. In addition to yield, productivity is also a very important metric.

UV glue (ultraviolet hardening glue), as the name implies, is glue that must be irradiated with ultraviolet rays to cure it. The curing of UV glue is different from thermal baking and curing. The curing time no longer needs several hours, only a few minutes, which can greatly shorten the production cycle time.

There are many methods available to excite ultraviolet light sources, among which the most common in recent years is LED (technical light emitting diode). LED has the advantages of small size, low heat radiation, low power consumption, long life, and fast response speed. It has a very important position for the improvement of process productivity.

Application of ultraviolet light
Generally, the wavelength of visible light is about 400~700 nm, and the spectrum of sunlight extends from ultraviolet light to infrared light, and the longest wavelength is about 4,000 nm. In terms of energy distribution, it is mainly in the narrow visible light band that accounts for about 50%, infrared light accounts for 43%, and other ultraviolet light accounts for 7%. The ultraviolet light can be divided into UV-A (400~315 nm), UV-B (315~280 nm) and UV-C (280~200 nm) according to the wavelength.

UV ink curing
In addition to UV glue, the application fields of UV curing inks and curing technology are also very extensive. The components of photosensitive inks or glues generally include: (1) Photoinitiator; (2) Reaction diluent monomer (Monomer); (3) Light curing resin (Resin); (4) Pigment or Functional additives (Oligomer).

For screen printing, UV curing has the advantages of fast speed and no need to use solvents, so it is widely used.