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The material of the notebook case (PU or imitation leather) is different from that of the inner pages (cardboard), and the bonding should balance flexibility and strength. Soft glue is resistant to bending and hard glue is firmly attached. Choosing the wrong one can easily cause the glue to peel or the leather surface to become hard.
| Dimension | Soft rubber (EVA type) | Hard adhesive (polyolefin) |
|---|---|---|
| flexibility | Okay, it won’t crack when bent | General |
| bond strength | Middle | high |
| Applicable Part | Leather case bend | Internal page fixation |
Soft glue is used at the connection between the leather cover and the inner page, while hard glue is used between the inner page and the backing. The application of glue in different zones is the most stable. Sunlifehot melt adhesiveProvide two sets of software and hardwareHot melt adhesive granules， Guangzhou Sunlife Trading can provide a combination plan according to the notebook structure.
Q: Is it normal for leather cases to be stiff in winter?Low temperature hardening is normal, choosing low-temperature soft rubber can improve the hand feel.
Q: Will the glue seep into the leather surface?By controlling the coating amount and temperature, thin coating can avoid glue leakage.
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