Why can't the needle of the dispensing machine be reused?
Publisher: Administrator Date: 2025-04-29
Analysis of the core reasons why dispensing machine needles cannot be reused
1、 Cross contamination risk
Batch contamination: Repeated use of needles can cause mixing of different batches of glue, and residual solidified particles or solvents may contaminate the new glue, disrupting product consistency.
Cleaning residue: The solvent or water bath used to clean the needle may remain in the pipeline and cause a chemical reaction when mixed with the glue, reducing the performance of the glue.
2、 Residual blockage and performance degradation
Accumulation of solidified particles: The inner diameter of the needle is usually small, and residual solidified substances can block the needle hole, leading to a decrease in the fluidity of the adhesive.
Structural damage: Repeated disassembly or high-pressure operation may cause deformation of the needle and wear of the pinhole edge, affecting the dispensing accuracy.
3、 Material performance degradation
Material degradation: Stainless steel or alloy needles that come into contact with chemical solvents during cleaning may experience microscopic corrosion, and long-term repeated use may pose a risk of needle breakage.
Sealing failure: The connection between the needle and the syringe may cause glue leakage and equipment contamination due to repeated installation wear and tear.
4、 Decreased operational stability
Pressure fluctuations during dispensing: Needle blockage or deformation can force the equipment to increase working pressure, exacerbating equipment wear and tear.
Loss of positioning accuracy: Reusable needles may experience positional deviation due to damage to the lubrication layer, affecting the qualification rate of complex path dispensing.
5、 Safety and compliance requirements
Microbial contamination: Repeated use in non sterile environments may introduce microbial contamination, causing fatal defects in precision products such as medical electronics.
Industry standards: Most industrial standards explicitly require dispensing needles to be disposable consumables, and repeated use may violate quality management system certification.
Conclusion: It is recommended to replace the needle every 8 hours or shorten the cycle according to the characteristics of the glue to ensure dispensing accuracy.
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