[Technical Commentary] The ultimate solution to noise suppression! How to choose a high-performance shielding tube

In recent years, with the increase in high-precision, high-density electronic devices such as electric vehicles, medical equipment, and industrial robots, measures against electromagnetic interference (EMI) have become increasingly important.

Among these, noise suppression tubes (shielded tubes) that can be retrofitted to cables are attracting attention as a simple and effective solution.

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Four common mistakes and how to solve them

The standard noise countermeasure for electronic devices and industrial equipment is the " shielded tube ."
However, when it comes to implementation, we often hear comments such as "It wasn't as effective as I expected" and "I'm having trouble with excess inventory."

This article explains common mistakes that can occur when selecting shielded tubes and how to avoid them .
You will no longer have to hesitate and will be able to make a choice without making a mistake.

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Common mistakes and solutions

❌ Mistake 1: The minimum lot size is too large, causing inventory to overflow within the company

Common points

• "I bought it to deal with noise, but I can't use it all..."

• Large orders for special sizes → Stockpiled because they cannot be used for other purposes

✅ Solution: Choose products that can be used in small lots and in standard sizes → Denka Electron can also handle small lot orders and sell just the quantity you need . We also have a wide range of versatile sizes available.

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❌ Mistake 2: There is a gap for the cable and it is not the perfect fit.

Common points

• Even the later-insertion type only comes in sizes from 20φ and up, so the diameter does not fit.
  

✅ Solution: Choose a flexible structure → Even if it is a wrap-around type, if you choose a tube with an inner conductor structure that fills in gaps, you can achieve zero gap shielding performance .

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❌ Mistake 3: Performance varies depending on the operator and winding method

Common points

• Gaps may occur depending on how you wrap it.

• It was effective during testing, but in the field, the shielding was insufficient...

Countermeasure: Choose a tube with high shielding properties → If the tube is designed to maintain consistent conductivity and grounding properties regardless of who wraps it, stable EMI countermeasures can be achieved.

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Mistake 4: It's hard and difficult to use in small spaces

Common points

• The metal foil is hard and difficult to bend, causing the cable to float.

• "Doesn't fit in the space" "Difficult to bend"

Solution: Choose a highly flexible material and divided structure → Denka Electron's shielded tubes are flexible and can be fitted into tight spaces . We also offer a wide range of open-close types that can be installed later .

● Summary of major issues

Problem	Content
Aluminum foil has low conductivity	Thinly processed foil has high electrical resistance and is not particularly effective at shielding against high frequency noise.
Incomplete grounding at the end	The flat braided wire is simply "sewn" into the cable, limiting the conduction path and weakening the shielding effect of the entire tube.
There are many gaps in the structure	The flat knitted wire is sewn into the structure, which makes it easy for gaps to form, and actually makes it easier for noise to leak through.
Low conductivity uniformity	In some cases, uniform conductivity is not achieved throughout the entire tube, and the shielding tube fails to fulfill its intended role.

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Denka Electron's "High-Performance Shield Tube"

The shield tubes we handle have a structure that solves these problems with conventional products.

✅ Feature 1: Highly conductive metal foil is used throughout

High-purity metal foil (copper) is used, and the conductive layer covers the entire periphery , providing powerful noise shielding from all directions .

It eliminates the "insufficient conductivity" that is common with thin-film aluminum foil, and provides stable shielding performance from several MHz to GHz bands .

✅ Feature 2: Reliable grounding

Unlike flat braided wire, which is partially sewn in, a reliable GND connection can be made from any point.

✅ Feature 3: Super flexible and adhesive-free

The inner layer is a combination of foil and PVC, and no adhesive is used. It is soft and easy to bend.

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Summary: Selection points that will prevent you from getting lost or making mistakes

Checkpoint	Content
Basis of shielding performance	Are the materials and structure backed up?
Gap prevention	Is the size appropriate?
conductive structure	Is it fully conductive or does it have a point contact structure?
Workability/Flexibility	Is it easy to handle in tight spaces or on-site?
Ease of ordering	Is it possible to handle small lots or custom orders?

"I can't get rid of the noise..." "I don't know which tube is best."
If you have any concerns, please feel free to consult with Denka Electron's specialist staff .