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Book binding, ordinary paper box sealing, selection Hot melt adhesive granules The EVA products inside are basically sufficient; When encountering difficult to stick plastics such as PP and PE, or packaging that requires low temperature/aging resistance, consider PO (polyolefin) type. The two are not better, but have different applicability.
| Dimension | EVA hot melt adhesive granules | PO hot melt adhesive granules |
|---|---|---|
| Common substrates | Paper, cardboard, fabric, and some PVC | PP、PE、 Non woven fabric, difficult to stick plastic |
| Initial adhesion speed | Quick, suitable for high-speed lines | Slightly slower, it needs to be pressed and shaped |
| heat resistance | Generally (softened at around 60 ℃) | Better, not brittle at low temperatures |
| Odor/Environmental Protection | Depending on the brand | Low odor and low VOC make it easier to produce |
| Price | more economical | relatively high |
Take the sample you actually want to stick as a sample: pull it open at room temperature to see the damaged surface. If the substrate is torn, it indicates that the strength is sufficient; If the adhesive layer falls off completely, it indicates that the wrong type or temperature has been selected. Sunlife hot melt adhesive has EVA and PO solutions for both book and packaging production lines. Guangzhou Sunlife Trading can send samples and test adhesives according to your substrate to avoid blind ordering.
Q1: Can PO completely replace EVA?
Cost wise, EVA is more economical for ordinary paper.
Q2: How to quickly distinguish which type is in your hand?
Check the “matrix resin” item in the test report, or send it to a third party for FTIR infrared identification.
Q3: Is there a problem with mixing two types of glue?
It is not recommended to mix and melt, as poor compatibility can lead to delamination and decreased strength.
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Let me start with a true story that I’ve been remembering for eight years. In the winter of 2016, a printing factory owner called me at 11 a.m. and started off by saying, “Brother Shu, something big has happened. The 50,000 textbooks I just bound have their adhesive ridges broken on the first page. The […]
