3 Factors That Affect The Selection Of Needles For Your Fluid Dispensing System

Dispensing needles, which are attached to the syringe, regulate the flow rate. However, there are many types of dispensing needles on the market, and different dispensing needles have their own benefits. If the wrong dispensing needles are used, this can lead to an increase in substandard products.

Choosing the right dispensing needle is a difficult task. We need to choose a dispensing needle of the right material, shape, and connection, depending on the nature of the glue. This article will help you to choose your dispensing needle.

Select The Right Material For Your Application

The dispensing needle is made up of two main components: the line and the coat. And their two primary materials are metal and plastic. They can be divided into three categories, one for metal, one for plastic, and one where the line is metal but the coat is plastic. Here are some examples of their benefits. Hope they may give you some ideas on how to choose the needles for your application.

Both the line and the coat are metal.

Metal dispensing needles are the most durable. They are available in two versions: standard stainless steel and standard stainless steel with multi-outlet tips.

Standard stainless steel tips are less prone to corrosion.

Standard stainless steel tips are protected against high pressure, corrosion, and rust by stainless steel. Meanwhile, stainless steel increases the needle's strength and durability while reducing the risk of liquid leaking. Due to their high quality and wide range of applications, they are very popular among fluid dispensing systems.

Standard stainless steel tips with multi-outlet can increase the dispensing rate.

Standard stainless steel tips with multi-outlet have the same characteristics as single-outlet tips. However, you can use multi-outlet tips to dispense in many locations at once. And they need to be customized according to the distance between two or more products. Therefore they are more expensive.

Both the line and the coat are plastic.

Plastic dispensing needles are lighter and can be made more functional. Here are 2 types with their benefits: smooth flow tapered tips and flexible tips.

Smooth flow tapered tips can block UV and visible light.

Smooth flow tapered tips' tapered design allows for a smooth flow of viscous fluids to prevent clogging while dispensing particle-filled materials. A greater flow rate allows you to lower air pressure and decrease dispense times. Due to their special design, they can guarantee accurate, repeatable dispensing.

Meanwhile, they are made of a unique polyethylene that has a light-blocking additive and is resistant to UV rays. Tapered tips in rigid plastic are used to protect light-sensitive fluids. They're also great for dispensing UV-cure adhesives, gel cyanoacrylates, solder paste, sealants, epoxies, RTV silicones, and other viscous pastes.

Flexible tips prevent scratching of the product.

Flexible tips have unique, inert polypropylene tubing, so they can prevent scraping or puncturing and can be easily angled or cut to length. Therefore they are easy to dispense in hard-to-reach locations.

The line is metal and the coat is plastic.

The combination of metal and plastic is cheaper than metal and more durable than plastic. Here are 2 types with their benefits: general-purpose tips and Teflon-lined metal needles.

General-purpose tips are the most cost-effective.

General-purpose tips are the most popular dispensing needle. The line is composed of stainless steel, while the coating is made of plastic. Anti-corrosion plastic makes the glue application more accurate, and the stainless steel material aids in precise placement. Plastic and stainless steel mix reduces manufacturing costs.

Teflon-lined metal needles prevent the glue from setting up quickly.

The Teflon-lined metal needles have an additional Teflon-lined than the general-purpose tips. Teflon is a non-stick material that makes it easy to dispense fluids, even those that are highly viscous. Teflon needles also have a very low friction coefficient, which helps to reduce the force required to dispense fluids. This can lead to faster dispensing times and less wear on the needle. Finally, Teflon needles are very resistant to chemicals and temperature changes, making them ideal for use in a wide range of environments.

The Shape Of Tips Effect On The Dispensing Rate

Choosing the right tip shape can help us to increase dispensing speed and accuracy and help us to dispense into difficult corners. Here are 3 shapes that could be applied and each shape has advantages: Chamfered tips, Oval tips, and Angled tips.

Chamfered tips are suitable for the low viscosity of the glue.

Chamfered tips' taper reduces the surface area that a solvent or other low-viscosity fluid can grip. They help the accurate and efficient delivery of glue. It's ideal for distributing tiny amounts of glue.

Oval tips can reduce glue clogging.

Oval tips provide consistent flat tips on deposit. They make high-flow, high-viscosity dispensing easier. And they work best with viscous liquids because they prevent the needle from becoming clogged.

Angled tips can dispense more areas and allow the glue to flow out more smoothly.

Angled tips have the appropriate bend radius, resulting in more uniformity, higher productivity, and less waste when dispensing in hard-to-reach regions. When dispensing, they create a cleaner, smoother flow paths. And they can dispense a variety of bait gels and pastes.

Connections Should be Taken Into Account

The needle is to be attached to the dispensing syringe. The method of connection will affect the degree of tightness and ease of replacement. There are two types of connections: threaded and bayonet.

The threaded kind is tighter.

The advantages of the threaded kind are that it makes the dispersion accuracy excellent, and the needle does not fall off. On the other hand, if the thread isn't tightened or the thread is slippery, it's easy to put the needle out of alignment; once the installation force is excessive, it is simple to twist and break it.

The bayonet kind is easier to replace.

The advantages of the bayonet kind are that it is cheap and easy to replace. But it is easy for the needle to be installed incorrectly; if the installation hole of the needle block is too big, the needle will fall out.

Conclusion

Based on the above information, we've combined a variety of needles for certain glues.

• Instant glue: Teflon-lined metal needles are used for water-based instant glues, smooth flow tapered tips are used for high-viscosity instant glues, and flexible tips are used if flexibility is required.
• UV glue: With an amber syringe and white plunger, use a smooth flow tapered tip that can block UV rays.
• Light-curing glue: A black syringe with a white plunger and a smooth flow tapered tip that is protected from visible light is used.
• Sealant and paste fluid: Use an oblique needle.
• Anaerobic glues: Use a 10cc syringe with a white PE universal piston and a well-sealed dispensing needle.

The dispensing needle is a critical component of the dispensing system. There are numerous distinct types of dispensing tips, each with its own set of benefits and drawbacks, depending on the application. When selecting a dispensing needle, you must consider factors such as material and shape according to the type of glue being used in your application. All of these parameters should be considered about your actual use and the adhesive you choose. When you need more information about this, feel free to contact me via [email protected].