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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.
One sentence conclusion For paper products such as book binding, cardboard box sealing, and quick printing of graphics and text, choose EVA for bonding Hot melt adhesive granulesOnly when the bonded parts need to withstand high temperatures above 80 ℃ for a long time, or when nylon, metal, or electronic components need to be bonded, […]
Answer directly low temperatureHot melt adhesive granulesSuitable for materials that are sensitive to heat and prone to deformation, with a melting temperature of about 110-130 ℃, it can complete bonding at lower temperatures, avoiding substrate burns, shrinkage, or wrinkling. Applicable Material List Film and flexible packaging:PE, PP film, aluminum foil composite layer, high temperature will […]
Direct answer: There are three main methods for testing the binding strength of books and periodicals – spine tension (page tension) test, repeated folding test, and drop and stacking test. If only one type is selected, publications should be given priority for page pull-out force testing; To cover real usage scenarios, the combination of tension […]
What do we need to inspect when replacing the adhesive particles for book and magazine packaging and making samples? Directly provide the list: When changing the glue or selecting a new supplier, a sample must be made and checked before formal productionAdhesive strength, page flipping flatness, appearance of book back, temperature resistance, opening time, odor, […]
