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Polyurethane foam in smartphone device applications

Polyurethane foam provides thin, light, and soft sealing and cushioning protection for smartphone displays. When designing display protection for portable devices, thinner and lighter profiles, variations in manufacturing tolerances, temperature fluctuations, water resistance and drop testing all add to the difficulty of electronic and electrical products. Polyurethane foam materials can be used for electronic devices to absorb and disperse impact energy, protecting the display and the electrical components inside from vibration, dust, moisture, and particulate matter.

Polyurethane foam's main characteristics
  1. has excellent sealing, to avoid gas release and fogging.
  2. Resistant to compression and deformation, that is, the elasticity has a lasting nature, and can ensure that the accessories get long-term shock protection.
  3. It is flame retardant, does not contain harmful substances, has no residue, will not pollute the equipment, and is not corrosive to the metal.
  4. Can be used in a variety of temperature ranges. From negative 40 degrees Celsius to 90 degrees Celsius range can be used.
  5. The surface has excellent wettability, easy to bond, easy to make, and easy to punch and cut.
  6. Engineered polyurethane formulations offer a wide range of moduli to meet increased design flexibility requirements

Polyurethane foam in smartphones main uses

Main Uses

  1. Panel sandwich: role - no pollution, prevent loosening, prevent impact noise, prevent sticking.
  2. Around the LED: prevent light leakage, absorb shock, and stretch high air tightness.
  3. PCB under the periphery: absorb shock, absorb vibration, fill the gap, insulation effect.
  4. Keyboard gasket: Anti-elasticity, non-pollution, good dimensional stability.
  5. Around the battery: non-pollution, absorb shock sound, improve air tightness.
  6. Footpad: good friction, non-pollution, good dimensional stability.
  7. Disk machine tail pad: absorb vibration, prevent impact noise, and improves air tightness.
  8. Friction gasket: good friction, non-pollution, good dimensional stability.
  9. Disc cover soft pad: absorbing vibration, blocking motor noise, preventing shock, and improving air tightness.
  10. Around the speaker: prevent noise, fill the gap.
  11. Around LCD: Dustproof, shock-absorbing, fill the gap, improve shading.

Anti-vibration protection
In order to protect the display from shock vibration, the display or LCD gasket must absorb and disperse shock energy to prevent cracks or other damage caused by mechanical shock. Polyurethane foam material absorbs and disperses impact energy, helping to prevent unwanted cracks in the display. Polyurethane foam materials provide superior protection against mechanical shock and impact damage.

Display back padding
For touch screens on tablets and other devices, display back pads help achieve superior cushioned sealing and provide long-term reliability. Back liner applications require an extremely soft material that disperses forces, provides good resistance to compressive deformation and compressibility, has a low spring back, and has good resistance to stress relaxation.

Reinforced Displays
In outdoor or industrial touchscreen applications, LCD displays must be able to withstand vibration, physical shock, and temperature fluctuations, while providing a highly conformable seal and gap fill. Polyurethane foam materials achieve good vibration isolation and shock absorption performance under stringent conditions.

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