How to Choose the Optimal Needle Nozzle for Liquid Dispensing | Musashi Engineering, Inc.

2024/12/27

We have compiled information on the types and selection methods of needle nozzles manufactured by Musashi Engineering.
Please use this as a guide for product selection.

Table of Contents

Needle Nozzle Lineup Comparison Table

Information such as needle length, needle outer/inner diameter, and external dimension drawings can be found in the "Parts, Accessories & Valve/Tank Catalog".

	Plastic needle	Double-Thread Plastic Needle	Metal Needle	Thin-Walled Metal Needle
Model	PN-□□G-A PN-□□G-B	DPN-□□G-◇ (◇=0,1,2,3)	SNA-□□G-B SNA-□□G-C	SNA-0.□□N-4L-F SNA-0.□□N-6L-F
Appearance
Material	Needle hub: Polyacetal Needle: Stainless steel	Needle hub: Polypropylene Needle: Stainless steel	Needle hub: Brass (Ni-plated) Needle: Stainless steel	Needle hub: Brass (Ni-plated) Needle: Stainless steel
Needle length	8mm(-A) 13mm(-B)	4 types: 6.4mm 12.7mm 25.4mm 38.1mm	13mm(-B) 15mm(-C)	4mm 6mm
Custom length	Not possible	Not possible	Possible	Possible
UV-resistant	△	×	〇	〇
Anaerobic-compatible	×	×	×	×
Application	Standard nozzle	Feeling of double-thread screw attachment Wide variety of needle lengths	Chemical resistance Customizable length	Less likely to interfere with walls or parts

	Double-thread tapered nozzle	PTFE nozzle	PTFE nozzle with SUS guide	Soft Needles
Model	TPND-□□G-U	TN-□□G TN-□□G-U	TN-□□G-○○L-□□G-△△L	PPN-□□G
Appearance
Material	Needle hub: Polyethylene Needle: Polyethylene	Needle hub: Polyacetal Needle: Fluororesin	Needle hub: Polyacetal Needle: Fluororesin *With SUS guide	Needle hub: Polypropylene Needle: Polypropylene
Needle length	38.1mm (total length)	8mm	Made-to-order with specified dimensions	35.9mm
Custom length	Not possible	Possible	Possible	Not possible
UV-resistant	〇	○ (only for -U)	△ (custom order)	×
Anaerobic-compatible	〇	〇	〇	〇
Application	Suitable for high-viscosity materials	Suitable for anaerobic materials Prevents damage to the workpiece	Easy to position the nozzle tip	Can be applied along the workpiece

	Double-thread screw Precision Solid Nozzle	High-Definition Nozzle	Sharp Needle	Curved Needle
Model	DSHN-M2	FN-0.□□N FN-0.□□ND	SPN	CPN-□□G-A45 CPN-□□G-B45 CPN-□□G-A90
Appearance
Material	Needle hub: Stainless steel Needle: Stainless steel	Needle hub: N-type brass (Ni-plated) ND-type stainless steel Needle: Not disclosed	Needle hub: Polypropylene Needle: Stainless steel	Needle hub: Polypropylene Needle: Stainless steel
Needle length	18.25mm (Total length)	N type: 23.0mm ND type: 22.2mm (Total length)	Depends on nozzle diameter	12.7mm (-A) 38.1mm (-B)
Custom length	Not possible	Not possible	Not possible	Not possible (Bending of SNA is possible)
UV-resistant	〇	×	×	×
Anaerobic-compatible	×	×	×	×
Application	Prevents clogging with filler-containing materials Reduced dispensing time	For fine and micro-dispensing	Suppresses creeping of low-viscosity materials	Hard-to-access areas can be coated

	Slit Nozzles	Multi-nozzle	Brush Nozzles	Multi-point Dispensing Needle
Model	-	MN	BN-S◇ (◇=1,2,3,4)	DN
Appearance
Material	Needle hub: Stainless steel Needle: Stainless steel	Needle hub: Stainless steel Needle: Stainless steel	Brush part: Polyester fiber	Needle hub: Brass (Ni-plated) Needle: Stainless steel
Needle length	—	Made-to-order with specified dimensions	S1,S2:(6.4mm) S3,S4:(10mm)	20mm
Custom length	Specify slit width and thickness	Made-to-order with specified dimensions	Not possible	Possible
UV-resistant	〇	〇	×	〇
Anaerobic-compatible	×	×	×	×
Application	Surface coating For solid coating	For multi-point dispensing or surface shape coating	For brush coating applications	Multi-point dispensing is possible

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What is a needle nozzle?

Needle nozzles are one of the key components for achieving high-quality dispensing in manufacturing environments. Because they come in various types and shapes to support a wide range of applications such as precise liquid discharge, bonding, and coating, making the right choice based on product characteristics and usage can significantly improve the efficiency and quality of the manufacturing process.

In this article, we will explain in detail the wide lineup of Musashi Engineering's needle nozzles and the key points for selecting them.

*At our company, we use the term "needle nozzle" rather than "nozzle needle."

How to choose a needle nozzle

There are four key points to consider when selecting a needle nozzle.

Select a nozzle with a material suitable for the type of liquid
Select a nozzle with a shape suitable for the viscosity of the liquid agent.
Select a nozzle suitable for the shape of the object (workpiece) to be coated.
Select a nozzle suitable for the coating shape.

1. Select a nozzle made of a material suitable for the type of liquid agent.

Needle nozzle materials are broadly classified into metal or resin. For example, if the liquid is a material that is incompatible with resin, such as an organic solvent, it is desirable to choose a metal one. On the other hand, when handling materials that react with metal, such as anaerobic adhesives, it is necessary to choose a resin one.

Metal	Resin

In addition to reactivity with the liquid, the presence or absence of light permeability may also be a criterion for judgment. When using UV-curable resins that harden upon exposure to UV light, it is necessary to use a needle nozzle made of a material that does not transmit UV light.

UV-transmitting	Does not transmit UV

2. Select a nozzle with a shape suitable for the viscosity of the liquid agent.

Needle nozzle shapes are broadly classified into straight and tapered shapes. Nozzles with a straight shape generally have a pipe shape of a certain length, so they have high flow resistance and make it difficult for high-viscosity liquids to flow, but they have the advantage of preventing low-viscosity liquids from dripping. On the other hand, nozzles with a tapered shape have low resistance during liquid discharge and excellent fluidity, making them suitable for discharging high-viscosity materials in a short time.

Straight shape	Tapered shape

Prevents dripping of low-viscosity materials	Easy to dispense high-viscosity materials

3. Select a nozzle suitable for the shape of the object (workpiece) to be coated.

Depending on the shape of the workpiece, whether the nozzle can access the desired application area is a key selection point. For example, if a tapered shape causes interference at the thicker part, a straight nozzle or a product with a longer needle tip is used. Depending on the workability, a resin nozzle that is less likely to damage the workpiece may be suitable. We also have bent nozzles in our lineup that can enter narrow areas.

4. Select a nozzle suitable for the coating shape.

In many bonding processes, dot or line application shapes are used, but by using special nozzles, different application shapes can be achieved. A representative example is the slit nozzle, which allows for surface coating (solid coating) in a single application motion.

Dot dispensing / Line dispensing	Surface coating	Multi-dot dispensing

Recommended for those who want to try various nozzles!
Nozzle Kit

Please keep these four points in mind and select the optimal nozzle for your purpose. When choosing nozzle types and sizes, a nozzle kit containing a set of basic nozzles is also recommended. It includes a total of 9 types of nozzles. Of course, if you have any questions or concerns regarding selection or application evaluation, please feel free to contact us.