High-viscosity UV adhesive is applied in small

Infusion bags are important medical devices for the safe and accurate delivery of liquid medication to patients. Highly reliable bonding is required, especially for ceramic connections. However, conventional bonding processes have the following challenges:

• Uneven adhesive application and dripping
  The previous application equipment was not stable in terms of discharge accuracy, resulting in variations in the application position and amount of liquid. As a result, dripping and uneven application occurred at the connection points, and the joints did not seal well, raising concerns about liquid leakage and a decrease in adhesive strength.
• Risk of poor curing specific to UV adhesives
  With light-curing adhesives, if the thickness or position of the application is uneven, UV irradiation may be insufficient, resulting in partial uncuring and poor bonding.
• Impact on long-term reliability
  Even if initial inspections showed no problems, variations in application accuracy and poor curing could lead to problems such as peeling, cracking, and leakage during long-term use, posing a risk to the durability and safety required for medical devices.

The introduction of the micro-dispensing needle valve “SV51” has achieved the following effects:

• Applying minute amounts of UV adhesive with high precision
  Accurate application volume control enables stable spot application of even highly viscous UV adhesives, achieving uniform thickness and positioning without dripping.
• Stabilizing the curing process
  Accurate application of the adhesive reduces unevenness in UV light irradiation, eliminating the risk of poor curing and providing consistent adhesive strength and sealing.
• Improving product reliability and safety
  The risk of leakage is significantly reduced, enabling accurate delivery of infusion medications, resulting in improved patient outcomes and reliability in the medical field.

Characteristics of the UV adhesive used

UV (ultraviolet) curing adhesives are suitable for high-reliability applications such as medical devices due to their:

• Instant curing: Can be cured in a few seconds to a few tens of seconds by UV irradiation. Contributes to shortening takt time.
• Single-component type for easy management: No mixing required, can be supplied with stable viscosity
• Transparency and durability: High visibility of the joint, suitable for optical equipment
• Environmentally friendly and solvent-free: No residual solvent remains after curing, making it easy to ensure biosafety

However, since areas where UV light does not reach tend to be poorly cured, it is essential to control the accuracy of application and UV irradiation conditions.By combining this with minute, precise point application, it is possible to maximize the performance of UV adhesives.