Can infrared rays cure glue?
Yes, infrared rays (IR) can be used to cure glue, but the specific effect depends on the type of glue and the wavelength and power of the infrared rays. Here is a detailed analysis:
1. Applicable glue types
Light-curing glue (such as UV glue):
Most UV glues require ultraviolet (UV) curing, but some formulas can be triggered by near-infrared (NIR, 700~1400nm) or specific wavelength infrared light (infrared-sensitive photoinitiators need to be added).
Heat-curing glue:
Infrared rays can indirectly cure glue (such as epoxy resin, acrylate, etc.) through thermal effects. Infrared radiation is absorbed by the glue or substrate and converted into heat energy, triggering a chemical reaction.
2. Advantages of infrared curing
Fast heating: Infrared rays act directly on the glue layer, and the heating speed is fast, which is suitable for high-speed production lines (such as electronic component packaging, automotive industry).
Local curing: It can accurately irradiate specific areas to reduce the thermal impact on surrounding materials.
No contact: Avoid physical contact contamination, suitable for precision devices.
3. Key parameters
Wavelength selection:
Short-wave infrared (0.7~1.4μm) has strong penetration and is suitable for thick glue layers.
Medium- and long-wave infrared (3~10μm) is easily absorbed by glue and is suitable for rapid surface heating.
Power and time: It is necessary to balance the curing speed and the heat resistance of the substrate (such as plastics may deform due to overheating).
4. Practical application cases
Electronics industry: infrared curing is used for PCB patch glue (SMT process).
Medical equipment: Rapid curing of medical adhesives (such as catheter assembly).
Composite materials: Infrared heating curing of prepreg.
5. Precautions
Glue formula: It is necessary to confirm whether it contains infrared sensitive ingredients (ordinary UV glue has no infrared response).
Substrate matching: Avoid infrared being reflected or excessively absorbed by the substrate, causing thermal damage.
Equipment debugging: It is necessary to optimize the irradiation distance, angle and energy distribution.
If the glue clearly supports infrared curing (such as some thermal curing or NIR curing glue), infrared is an efficient choice; otherwise, its compatibility needs to be verified first. For traditional UV glue, ultraviolet light source is still required. you can find more information on http://www.benweilight.com
