UV glue not fully curing is a problem that can arise in many application areas, especially in industries that use UV curing technology, such as electronics, optics, medical, and industrial manufacturing.
The following details the common causes of incomplete curing of UV glue and the corresponding solutions:
1.Problems with light sources
The UV wavelength emitted by the UV lamp may not match the photoinitiator in the UV glue used, resulting in an ineffective initiation of the curing reactionOr the UV lamp energy is insufficient, the light intensity is not enough, especially after long-term use, the energy attenuation of the light source is obvious.
2.The depth of penetration is insufficient
For materials that are too thick or darker, UV light may have difficulty penetrating the bottom, so that the UV glue inside is not sufficiently irradiated to cure.
3.The dual-curing mechanism is not complete
Some UV glues are designed as dual-curing systems, which require exposure to air (moisture) in addition to UV curing to complete the entire curing process, and may not cure thoroughly if only UV light is applied and does not meet humidity requirements.
4.Storage and expiration date
Excessive storage time of UV glue may lead to the degradation of its performance, especially the reduction of the activity of the photoinitiator, which affects the curing effect.
5.Improper dilution
Excessive amounts of non-reactive diluent are added, which reduces the proportion of active ingredients in the UV glue, which hinders the curing reaction.
6.Dispensing process issues
If the adhesive line is too thick, or the dispensing is uneven, the local area of light cannot penetrate deep into the adhesive line, so that it cannot be cured.
1.Replace with a suitable light source
Select a UV lamp that matches the wavelength and has sufficient output power according to the UV glue product instructions, and make sure to replace it regularly to maintain the high-intensity output of the light source.
2.Enhanced penetration
For thick or colored materials to be bonded, you can choose UV glue with stronger penetration, or use a process that is applied in layers and cured layer by layer.
3.Supplemental moisture curing
For UV glues that require dual curing, make sure there is the right amount of moisture in the curing environment and allow it to complete the remaining curing steps naturally in the air for a defined amount of time.
4.Proper storage and management
Strictly adhere to the storage conditions of UV glue, control temperature and humidity, use fresh batches of products, and avoid using glue that has expired or has been stored for a long time.
5.Correct dilution and proportioning
Dilute UV glue in strict accordance with the manufacturer's guide ratio and avoid adding non-specified diluents by yourself.
6.Optimize your dispensing process
Adjust the parameters of the dispensing equipment to ensure that the thickness of the adhesive line is moderate and uniform, and if necessary, the method of segmented curing or multi-angle irradiation can be used to ensure the overall curing effect.
Through the above cause analysis and solutions, the curing of UV glues can be improved in a targeted manner to ensure the quality and performance of the final product.
Finally, if you still can't solve the problem that the UV glue is not fully cured, you can contact the manufacturer or a professional for help.
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