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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.
Hot melt adhesive sticks to knives and solidifies slowly, mostly because the glue is not yet cured and is hit by cutting knives or pressure plates. Inspect and handle from four aspects: temperature, machine speed, environment, and adhesive layer.
Conclusion first:For printing factories with monthly usage of less than 2 tons and multiple machines for dispersed use, 25kg bags are more cost-effective; Packaging factories with stable monthly usage exceeding 3 tons and centralized feeding conditions have lower unit prices and more labor-saving for ton bags (500-1000kg bags).The price difference between the two is usually […]
How to interpret the numerical meaning of hot melt adhesive models? What do 292, 296, 391, and 39B represent respectively When purchasing hot melt adhesive, many customers are confused by the model: “What is the difference between 292 and 296?” “Why can 391 be spread evenly?” “What kind of adhesive is 39B? These numbers are […]
What can hot melt adhesive stick and what cannot? This article explains the scope and boundaries of the application of heat clearing adhesive by material, helping you avoid detours before selecting.
