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VOL.187 2021.10.13 Teikoku Printing Inks Mfg. Co.,Ltd.

TECHNICAL REPORT

Good news! For those who want to create electromagnetic wave shielding and implement electrostatic countermeasures inexpensively and effectively.

Replace various conductive materials with screen printing

Conductive ink
that allows
free setting of resistance value

Thanks to adjustment technology of resistance value, effective electromagnetic wave shielding and electrostatic countermeasures are possible by screen printing. In addition, this adjustment technology expands the application possibilities such as quality improvement of sensor device and cost reduction of electronic circuits.

Replace various conductive materials with screen printing Replace various conductive materials with screen printing

1. Conductive ink that enables you to set electrical resistance value freely

Achieve both screen ink function and flexible electrical resistance value

Our conductive ink can be set in a wide range of surface resistivity from 1.0 x 10-2 (Ω/sq) to 1.0 x 1010 (Ω/sq) or higher, from conductive to non-conductive. Owing to this ink, you can produce electromagnetic wave shielding and conduct electrostatic countermeasures, etc. with inexpensive and highly flexible screen printing.

In addition, by applying this conductive function to other inks, it is possible to improve sensor quality and reduce the cost for electronic circuits.

 

Surface resistivity and Application

 

 

Application Surface resistivity (Ω/sq) Main effects

Electromagnetic wave shield

1.0x10-2 to 1.0x104

  • Block the intrusion of electromagnetic waves and prevent malfunction of internal circuits
  • Block the leakage of electromagnetic waves and prevent malfunctions of peripheral devices and health damages.

Electrostatic countermeasures

1.0x104 to 1.0x1010

  • Prevent electrification and avoid electric discharge and dust adhesion due to electrostatic.
  • Prevent electric discharge from the outside by setting a high resistance value

Sensor quality improvement aid

Resistance value suitable for the application

  • Prevent malfunction due to electromagnetic wave incidence to the senor and electrostatic discharge
  • Reduce dust adhesion due to electrostatic and improve sensor sensitivity

Assist cost reduction of electronic circuits

Resistance value suitable for the application

  • Add functions such as electromagnetic wave shielding and electrostatic countermeasures to the circuit
  • Replacement by printing electronic circuit elements (resistors, etc.) and insulators

 

 

Basic performance of conductive ink

Standard conductive inks are as follows. Resistance values other than the following inks can also be set by adjusting ink and printing conditions. For example, the surface resistivity can be made lower than that of single-layer printing by using multi-layer printing.

Ink name Ink layer thickness (single layer) Surface resistance Applicable substrates
MRX-HF Conductive Ink
Brown
14µm
(56µm (4 layers))
  ≤ 1Ω/sq
  (≤ 0.06Ω/sq (4 layers))
PET, PC, etc
MRX-HF Conductive Ink
Gray
14µm   ≤ 200Ω/sq Same as above
MRX-HF Conductive Ink
Black
10µm   ≤ 2000Ω/sq Same as above
GLS-HF Conductive Ink
Gray
10µm   ≤ 10Ω/sq Glass, polyamide
GLS-HF Conductive Ink
Black
8µm   ≤ 2000Ω/sq Same as above

 

 

Common excellent features of conductive ink

Conventionally, electromagnetic wave shields and electrostatic countermeasures have been dealt with by methods such as using metal foil and conductive materials. However, printing conductive ink is a less expensive and more flexible method than the conventional method.

Excellent features Details

Flexible setting of resistance value

  • A wide range of resistance values can be set depending on ink’s resistance value and printing conditions (ink layer thickness, etc.).
  • 1.0 x 10-2 to 1.0 x 1010 (Ω/sq) or higher of surface resistance is possible

High moisture resistance, lightweight and thin

  • Compared with metal foil and metal vapor deposition, it is more resistant to humidity and has less deterioration in performance over time.
  • Achieve the same performance in light weight and thinness compared with other construction methods

Inexpensive and flexible screen printing

  • Compared with pasting metal foil and painting conductive materials, printing is a simple and inexpensive method.
  • It is possible to adjust resistance value, parts and patterns where conductivity is added which is difficult with other methods.

Achieve both decoration and other functions

  • It is possible to get both conductivity and decoration by adding conductivity to decorative ink and overprinting.
  • It is possible to get both other ink’s functions such as sensor compatible (IR transmission) and conductivity.

2. Electromagnetic wave shielding ink

What is electromagnetic wave shielding ink ?

Electromagnetic wave shielding ink blocks electromagnetic wave from intruding or leaking into the printed ink layer. Thanks to this ink, it is possible to apply an electromagnetic wave shielding function by inexpensive screen printing.
The following is an example of the printed material using electromagnetic wave shielding ink that blocks shields electromagnetic waves (in this case, radiated electric field) radiated from the computer screen. You can see the value of radiated electric field has been dropped from normal value of 128 (V/m) in the left photo to unmeasurable of 0 (V/m) in the right photo.

Electromagnetic wave shielding ink
Electromagnetic wave shielding ink

 

 

Electromagnetic wave shielding ink that shows sufficient effect even with single-layer printing

The following table is a comparison of shielding effect on electric fields between single-layer printing and multi-layer printing of MRX-HF conductive ink. (Substrate: PC, layer thickness of solid printing: 14µm for single layer, 56µm for 4 layers) Good shielding effect can be obtained even with 14µm for single-layer printing in the range of low frequency of 50MHz or less.

However, in case higher frequency range with 50MHz or higher is required, multi-layer printing is more effective than single-layer one (see below tables).

Electromagnetic wave shielding ink that shows sufficient effect
Electromagnetic wave shielding ink that shows sufficient effect

 

 

Electromagnetic wave shielding ink that shows excellent effects in high frequency range

The following table shows the comparison of our MRX-HF conductive ink with 4-layer printing and competitor’s products (paint made of silver and copper and mesh sheet using copper) Note: Frequencies are shown by line shapes to compare high frequencies. (Frequencies in the graph above are shown by logarithmic scale) Compared with other methods, 4-layer printing with MRX-HF Conductive ink exhibits overwhelming shielding effect in the high frequency range.

the comparison of our conductive ink and competitor’s products
the comparison of our conductive ink and competitor’s products

 

 

Printing example of electromagnetic wave shielding ink

This is a printing example of black, gray and brawn of MRX-HF Conductive ink (substrate: PC) Achieving both an electromagnetic wave shielding function and decoration, it is possible to apply it to process reduction.

Printing example of electromagnetic wave shielding ink

 

3. Anti-static measure ink

What is anti-static measure ink ?

Anti-static measure ink can add functions such as prevention of static charge, Electro-Static Discharge countermeasures by inexpensive screen printing.

For anti-static measure, it is necessary to appropriately adjust the electrical resistance value of the area where ink is printed according to the preconditions (usage environment, cause of electrostatic, etc.) and the problem to be solved (electrification, electric discharge, etc.). Therefore, anti-static measure ink, which allows you to freely set the resistance value and printed area, is one of the most ideal solution for them.

 

Electrical properties and surface resistivity used for anti-static measures

The following table shows the classification of electrical properties used for anti-static measures and advantages(Ο) and disadvantages(×) of each countermeasure. (Refer to: IEC 61340-5-1,5-2 Standard)

Classification of electrical properties and surface resistivity used ρs(Ω/sq) Characteristics and application to anti-static measures

Electrostatic conductivity
1.0x102 ≤ ρs < 1.0x105

It is hard to be electrified but electrical charge moves faster
Ο It unlikely becomes a source of electrostatic as it hardly electrifies.
× There is a risk of electric discharge when a charged object comes into contact with it.

Electrostatic diffusivity
1.0x105 ≤ ρs < 1.0x1011

It is hard to be charged and electrical charge diffuses slowly (the area used for antistatic).
Ο It is not easily charged by nature and even if it is electrified, it discharges relatively slowly.
Ο Intense discharge does not occur even if a discharged substance comes to contact with it.
× It is necessary to adjust resistance value according to the solution
   (charging conditions, desired charge decay, etc.)

Insulation
1.0x1011 ≤ ρs

It is easily charged and the charge is easily stored but the speed of transfer and diffusion is small.
Ο Discharge does not occur as it does not energize even if a charged substance comes
   to contact with it.
Ο It is a solution to reduce the risk of discharge under limited conditions.
× It causes static electricity as it is easily charged by friction.

 

Printing example of anti-static measure ink

The photo below shows the printed material of GLS-HF Conductive ink Black and Gray (substrate: glass) Static charge can be prevented by setting the optimum resistance value in the electrostatic diffusivity region, which can solve problems such as discharge and dust adhesion, etc.

Printing example of anti-static measure ink
Printing example of anti-static measure ink

 

4. Application to quality improvement of sensor equipment

What is application to quality improvement of sensor equipment ?

The application to quality improvement of sensor equipment means that quality improvement can be realized by using conductive functions to solve deterioration of sensor sensitivity due to dust adhesion and sensor malfunction due to incident of electromagnetic waves. As these methods can be used with decoration process, compared with other methods, they can be implemented more easily than other methods.

Application to sensor equipment Beneficial effects

Anti-static measure

  • Apply antistatic treatment to housing and light receiving port to prevent dust adhesion and to improve sensing sensitivity.
  • Take countermeasure against discharge due to static electricity to prevent malfunction

Electromagnetic wave shield

  • Apply electromagnetic wave shield to housing to prevent malfunction.

 

Application example to quality improvement of sensor equipment

Applying anti-static measures to sensor ink for sensor light receiving port and ink for decorating housing, which prevents dust adhesion due to static electricity to the light receiving port and contributes to sensor sensitivity improvement.

Application example to quality improvement of sensor equipment

 

5. Application to cost reduction of electronic circuits (Please contact us for details)

What is the application to cost reduction of electronic circuits ?

The application to cost reduction of electronic circuits means that replaces the elements and necessary functions used in electronic circuits by printing inexpensive and highly flexible conductive ink. This alternative method has a good compatibility with flexible circuits because its material is screen ink.

Note: As there is a case where printing is impossible depending on the content of alternation or problem to be solved, please feel free to get in touch with us for the specific issues and whether or not they can be solved by printing.

How to apply to electronic circuit boards Features

Replacement of resistor

(Please feel free to get in touch with us for feasible resistance values, printing performance values, etc.)

  • Achieve the optimum resistance value by adjusting the resistance value, printing pattern, and layer thickness.
  • Drastically reduce number of parts and mounting processes as it can be done only by printing

Replacement of other electron elements

  • Realize insulation by screen printing that can prevent circuit shortcuts, etc.

Countermeasures against electromagnetic waves and static electricity

  • Realize leakage prevention of electromagnetic waves by printing
  • Realize damage prevention of electronic circuits due to static electricity discharge by printing

 

 

Substitution by printing of electronic circuit elements (the photo is just an image.)

The following is an image photo of electronic circuit substituted by screen printing elements. As for applying both conductivity and fine lines, limit values will vary depending on the conditions. If you are considering alternative electronic circuit elements (resistive elements, etc.) by printing, please feel free to contact us to discuss the possibility of solving your issue.

 

Substitution by printing of electronic circuit elements

 

 

Teikoku Printing Inks Mfg, Co., Ltd.

Teikoku Printing Inks Mfg, Co., Ltd./Laboratory
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