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Many customers see Hot melt adhesive granules If it turns yellow, I’m worried about poor quality. In fact, the color mainly comes from the resin grade and whether anti-oxidation and thickening agents are added, and has no direct relationship with whether it is sticky or not.
| color | Common causes | Typical use |
|---|---|---|
| White/Milk White | Light colored resin with minimal additives | Light colored paper, transparent window, high appearance requirements |
| Yellow/Slightly Yellow | Dark colored thickening resin or antioxidant | Ordinary books, corrugated boxes, concealed locations |
| Transparent | Special low yellowing formula | Gift boxes and electronic packaging can meet in person |
Look at the adhesive object and appearance requirements: For invisible positions such as sealing boxes and book spines, yellow material has a high cost performance ratio; Gift boxes, transparent windows, light colored cardboard and other “exposed” positions require white or transparent materials. Sunlife Hot Melt Adhesive’s Guangzhou Sunlife Trading offers white/yellow/transparent multi color options, according to the appearance of your finished product, without having to spend extra money on invisible areas.
Q1: Will yellowing become increasingly severe?
Qualified materials are stable within their shelf life, and exposure to sunlight can accelerate yellowing. They should be stored away from light.
Q2: Does it matter if the color of the same model is slightly different?
The slight difference between different batches is normal, and the strength is not detected in color.
Q3: Is transparent adhesive necessarily the most expensive?
Usually slightly higher, but only when available in person, with controllable dosage.
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Conclusion first: Exported books and periodicals need to be transported across the ocean, through high-temperature containers and temperature differences between high and low temperatures. Ordinary rubber particles are prone to sticking or becoming brittle during transportation, while weather resistant hot melt rubber particles have a higher softening point and a more balanced resistance to high […]
First, let’s draw the conclusion: it depends on the substrate and temperature resistance 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 […]
In the book printing and binding industry, hot melt adhesive is the core auxiliary material that determines the quality, environmental protection level, and compliance of books. Many printing and binding factories encounter these problems: new books that have been left out of the factory for a long time turn yellow and peel off, pages crack, […]
