High School Why Does a New Syringe Have an Open Piston?

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SUMMARY

The piston in a new syringe is often not completely closed to prevent adhesion to the front wall, which can occur due to the seal created between the rubber and plastic components. This design choice allows for easier operation and reduces the risk of breaking the seal when pulling the plunger. Users have noted that leaving the piston partly open can help avoid sticking, particularly in syringes used for inks and aqueous solutions rather than medical applications.

PREREQUISITES
  • Understanding of syringe mechanics and design
  • Knowledge of materials used in syringe construction (rubber and plastic)
  • Familiarity with the applications of syringes beyond medical use
  • Experience with handling syringes in various contexts (e.g., photography, ink application)
NEXT STEPS
  • Research the impact of syringe piston design on fluid dynamics
  • Explore the properties of rubber and plastic in syringe manufacturing
  • Investigate alternative syringe designs for specific applications
  • Learn about the maintenance and cleaning of syringes used for non-medical purposes
USEFUL FOR

This discussion is beneficial for individuals involved in syringe manufacturing, photographers using syringes for ink application, and anyone interested in the mechanics of syringe operation.

Leodoc
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Why the piston in a new syringe is not completely closed,,?
Is it just because of to differentiate from New one or it just have a scientific reason
 
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I am just guessing, but it may be to prevent adhesion to the front wall.
 
Dale said:
I am just guessing, but it may be to prevent adhesion to the front wall.
May be,, because even after not completely closed it well tight..
 
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Leodoc said:
Why the piston in a new syringe is not completely closed,,?

Are you sure that this is always the case?
 
Leodoc said:
Why the piston in a new syringe is not completely closed,,?
Is it just because of to differentiate from New one or it just have a scientific reason
Welcome to the PF.

Can you say more about your question? Using Google Images or Google Shopping, I see new syringes that are fully closed and some that are open a little.

https://cdn-1.au.xmsymphony.com/4d9c396d11102d97ff4226a2e42b15a4/contents/V00064/insulin-syringe.jpg

insulin-syringe.jpg
 

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I leave syringes partly open because they sometimes stick. I don't know if this would happen with new ones, or whether it is due to slight contamination remaining after use. (Despite washing.)
My reason, based on experience of not doing it, is that I can press hard and break the seal/bond, but if I pull the rubber gets pulled off the plastic plunger.

Just in case PC PF people are worried, I do not use these for medicines nor anything like that! Mainly inks and aqueous solutions for photographic processes.
 
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