For single-layer IML cases, the tendency for magnetic rings to detach is primarily related to their structural characteristics and physical stress. To achieve a thinner profile, the magnets in single-layer cases are often added later. This non-integrated design naturally results in significantly weaker structural strength.
1. Insufficient Surface Bonding Issues: Magnetic rings are typically attached to the inside of the case. Since the inside of a single-layer IML case is usually a smooth PC or TPU surface, some products lack recessed slots for magnets, leaving the magnetic ring only attached via adhesive, resulting in very limited adhesion.
2. Magnetic Tension: This is the most direct cause.
- External Pulling Force: When using a magnetic power bank or magnetic stand, a strong pulling force is generated between the magnets.
- Leverage Effect: Every time you "pry" your phone off the magnetic accessory, the magnetic ring experiences an outward vertical pulling force. For a single-layer shell, the entire force is borne by that thin layer of adhesive. Over time, the adhesive fatigues, and the ring will be pulled out directly.
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