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How to choose a shield tube that will not cause any confusion or mistakes
Technical · EMC · Shield Tube
The Definitive Guide to Noise Countermeasures! How to Choose a Shield Tube
The Definitive Guide to Noise Countermeasures! How to Choose a Shield Tube
— 4 Common Mistakes and How to Avoid Them —
Conclusion: You can avoid mistakes in shield tube selection by focusing on these four points: conductivity, gap countermeasures, flexibility, and small-lot availability.
In recent years, as high-precision and high-density electronic devices such as EVs, medical equipment, and industrial robots increase, electromagnetic noise (EMI) countermeasures have become increasingly important. Shield tubes that can be retrofitted to cables are a simple and effective solution, but we often hear feedback such as "the effect was not as expected." This article explains common mistakes and how to avoid them.
4 Common Mistakes in Shield Tube Selection
1
Failure 01
Minimum lot size is too large, leading to excess inventory
"I bought it for noise countermeasures, but I can't use it all up..." "Mass-ordered for a specific size → Can't be used for other purposes, becoming inventory."
✅ Solution: Choose small-lot compatible and common sizes
Denka Electron supports cut-to-length and small-lot orders for the exact quantity you need. We also offer a wide lineup of highly versatile sizes.
Denka Electron supports cut-to-length and small-lot orders for the exact quantity you need. We also offer a wide lineup of highly versatile sizes.
2
Failure 02
Gaps around the cable, no perfect fit size available
Even for retrofittable types, only sizes from 20φ are available, leading to a mismatch in diameter. Gaps allow noise to leak through.
✅ Solution: Select a flexible structure with an inner layer designed to fill gaps
By choosing a tube with an inner conductor that fills gaps, even with a wrap-around type, you can achieve zero-gap shielding performance.
By choosing a tube with an inner conductor that fills gaps, even with a wrap-around type, you can achieve zero-gap shielding performance.
3
Failure 03
Performance varies depending on the worker or winding method
Gaps occur depending on the winding method. The effect was present during testing, but the shielding was insufficient in the field, leading to many such cases.
✅ Solution: Choose a design that maintains uniform shielding performance
With a tube designed to ensure uniform conductivity and grounding regardless of who installs it, stable EMI countermeasures can be achieved.
With a tube designed to ensure uniform conductivity and grounding regardless of who installs it, stable EMI countermeasures can be achieved.
4
Failure 04
Rigid and difficult to use in narrow spaces
The metal foil is stiff and doesn't bend, causing cables to float. Feedback from the field includes "doesn't fit in the space" and "difficult to bend."
✅ Solution: Choose highly flexible materials and open/close types
Denka Electron's shield tubes are flexible and adapt to wiring in narrow spaces. We also offer a wide range of open/close types that can be retrofitted.
Denka Electron's shield tubes are flexible and adapt to wiring in narrow spaces. We also offer a wide range of open/close types that can be retrofitted.
Summary of Common Problems with Conventional Products
| Problem | Details |
|---|---|
| Low conductivity of aluminum foil |
Thinly processed foils have high electrical resistance, resulting in insufficient shielding effect, especially for high-frequency noise. |
| Incomplete grounding at the ends |
The braided wire is "simply stitched in," limiting the conductive path. This weakens the overall shielding effect of the tube. |
| Many gaps in the structure |
Due to the structure where braided wires are stitched, "gaps" easily form, allowing noise to leak. |
| Low uniformity of conductivity |
Uniform conductivity is not achieved throughout, and in some cases, the shield tube does not fulfill its original role. |
"High-Performance Shield Tubes" Proposed by Denka Electron
Our shield tubes adopt a structure that solves the problems of conventional products.
✓
High-conductivity metal foil used throughout
The structure features high-purity metal foil (copper) covering the entire circumference, providing strong shielding against noise from all 360 degrees. It exhibits stable shielding performance from several MHz to GHz bands.
✓
Reliable grounding process
Instead of partial stitching of braided wires, the structure allows for reliable GND connection from any desired point.
✓
Ultra-flexible, no adhesive used
The inner layer is an integrated structure of foil and PVC, with no adhesive used. It is soft and easy to bend, adapting to wiring in narrow spaces.
✓
Small-lot and cut-to-length availability
You can order only the necessary quantity, from prototyping and evaluation to mass production. This minimizes inventory risk.
Summary · Selection Checklist for Avoiding Mistakes
Basis of Shielding Performance
Is it backed by materials and structure? Check for full-circumference conductivity.
Gap Countermeasures
Is the size appropriate? Does the inner layer have a structure that fills gaps?
Workability and Flexibility
Is it easy to handle in confined spaces and on site? Is it a split type or can it be installed afterward?
Ease of Ordering
Are small lots, cut-to-length, and custom orders possible?
"Can't get rid of all the noise..." "Don't know which tube is best." If you have these concerns, please consult with Denka Electron's expert staff.
Consult us for shield tube selection and samples
We will propose the optimal product if you provide us with information on noise symptoms, cable diameter, and operating environment.
