Wireless headphones have become an indispensable part of our daily lives, providing seamless connectivity and high-quality sound. However, in addition to stylish design and advanced audio technology, robust and reliable bonding solutions play a crucial role in ensuring durability, performance, and longevity.
Adhesives are widely used to bond wireless earphones and charging cases, and to bond various components to withstand daily wear and tear.
Below, we will provide a detailed introduction to the adhesive substrates and application requirements for key adhesive applications in headphones and charging cases.
Speaker bonding and sealing
Recommended product: PUR 1603 A/B fast curing polyurethane adhesive
Machine dispensing or manual mixing is available
Rapid curing at room temperature for 30 minutes
Strong adhesion to various substrates
High toughness and elasticity
Excellent resistance to aging and chemicals
Adhesive substrates: copper, polycarbonate+glass fiber (PC+GF), aluminum
Application requirements: The speaker diaphragm and housing must be firmly bonded to prevent sound leakage and ensure optimal sound quality.
Charging box magnet bonding
Adhesive substrate: nickel plated magnet, PMMA (acrylic), PC (polycarbonate)
Application: There is a small magnet inside the charging case, which helps to secure the earphones in place during charging.
Adhesive between headphone speaker and FPC flexible circuit board
Adhesive substrate: Flexible Printed Circuit Board (FPC), metal contacts
Application: Adhesives should have excellent electrical insulation, heat resistance, and lightweight adhesion to maintain optimal signal transmission.
Shell to shell bonding
Adhesive substrates: polycarbonate (PC), acrylonitrile butadiene styrene (ABS), aluminum, glass
Application: The outer shell of the wireless earphone and charging case must be firmly bonded to protect the internal components from external impacts and improve the IPX level of the device.
Recommended product: SIPC 1859 silicone adhesive sealant
Excellent chemical resistance, low odor, good adhesion
Low volatile matter not exceeding 500ppm, no corrosion or fogging in a sealed environment
Resist moisture, dirt, and other atmospheric components
Reduce mechanical stress and tension caused by mechanical, thermal shock, and vibration
Excellent outdoor aging resistance, with a service life of up to 20-30 years
Stable mechanical and electrical performance between -60-300 ℃
