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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.
Where does batch color difference come from? hot melt adhesive pelletsThe color depends on the natural color of the EVA resin batch, the type of tackifying resin, the whiteness of the filler, and the amount of coloring agent added. Small fluctuations in each batch of raw materials can lead to color differences in the finished […]
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What does the length of the adhesive tape affect The problem of excessively long glue threads on the book and magazine binding line is a headache for the production line: the glue threads wrap around the book core, dirty the cover, and the glue breaks unevenly. In severe cases, each shift needs to be shut […]
Curing too fast and not seeping into the paper seam? First, check these 5 parameters In book and magazine packaging,hot melt adhesive pelletsThe curing speed directly determines whether the adhesive can fully penetrate the spine paper seam. Curing too quickly=Insufficient penetration=Weakened bonding strength. The following 5 key parameters help you quickly locate the problem. 1. […]
