Quick check list for transparency of hot melt adhesive layer in book and magazine packaging: 5 scenarios do you need transparent adhesive particles

Why is the transparency of the adhesive layer important?

The adhesive layer of books and magazines is usually covered by the spine cover, and transparency is not important in most scenes. However, in some special binding designs, the adhesive layer may be exposed and visible, such as bare spine binding, transparent covers, display grade samples, etc. At this time, the color and transparency of the adhesive layer directly affect the aesthetics of the finished product.

Do 5 scenarios require transparent adhesive particles

• 1. Ordinary adhesive spine (cover wrapped)
  No need → The adhesive layer is covered by the cover, white/yellow/transparent are all acceptable
• 2. Bare spine binding (exposed spine glue layer)
  Need → Transparent adhesive particle layer is invisible and does not damage the beauty of the bare spine
• 3. Transparent PVC cover binding
  Need → Visible glue line through cover, white/yellow glue layer appears abrupt
• 4. Sample display booklet (spine cut to display adhesive layer)
  Optional → Transparent adhesive particles display the wetting effect of the adhesive layer, white adhesive particles display the width of the adhesive line
• 5. Round corner binding of children’s picture books
  Optional → Transparent adhesive particles do not show color difference at rounded corners, but the price is slightly higher

Difference between transparent adhesive particles and white adhesive particles

Transparent adhesive particles are made of high-purity EVA and light colored tackifying resin, without titanium dioxide fillers, with a cost increase of about 10-15%. The adhesive performance is consistent with the white adhesive particles of the same formula, with the only difference being the appearance. Sunlifehot melt adhesiveThe transparent series is suitable for both bare spine and transparent cover binding. Guangzhou Sunlife Trading provides two types of samples for comparison: transparent and white.

Frequently Asked Questions

• Q: Will transparent adhesive particles turn yellow after prolonged use?
  A: I will. Long term thermal oxidation of EVA substrate causes slight yellowing, but the changes in bare spine staples are generally not significant within 3-5 years.
• Q: Are there transparent adhesive particles that do not completely turn yellow?
  A: PA based transparent adhesive particles have better resistance to yellowing, but are more expensive and suitable for high-end display and binding.
• Q: Is the adhesive strength of transparent adhesive particles the same as that of white?
  A: Under the same formula, it is exactly the same. Transparency ≠ low strength, only the titanium dioxide filler is removed.