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Direct answer: For activities such as annual report brochures that require “thick copperplate paper+laminated cover+flat spreading”, the selection of adhesive should focus on 8 parameters – initial adhesion, opening time, softening point, melt viscosity, flexibility, cold resistance, odor level, and color stability. Any non-compliance may expose problems after the delivery of the finished product.
Three characteristics are superimposed: the inner pages are mostly 128-200g copperplate paper, and the surface coating hardly absorbs glue; Cover with matte film or tactile film for a smoother adhesive surface; Customers often require cross page images to be displayed flat and have high requirements for the flexibility of the adhesive layer. Ordinary book glue can be used without any problem in the short term, but it may peel after three months.
| Serial number | parameter | Suggested indicators |
|---|---|---|
| 1 | Initial Tack | High, press for 2 seconds to locate |
| 2 | Opening hours | 6-10 seconds, suitable for thick beats |
| 3 | softening point | 80–90℃ |
| 4 | Melting viscosity (180 ℃) | 4000–7000 mPa·s |
| 5 | flexibility | After solidification, it can be repeatedly bent without cracking |
| 6 | cold resistance | -10 ℃ non brittle (shipped in winter) |
| 7 | odor level | Low odor, avoid residual odors after binding |
| 8 | color stability | Long term adhesive glue does not show obvious yellowing |
firstlyFolding testRandomly sample and fold the spine of the book 200 times without any broken or cracked glue; Secondheating cycle Place the sample at -5 ℃ for 4 hours and then at 50 ℃ for 4 hours, cycle twice, and check if the glue has opened; three isPeel off testTear open the spine of the book to check if the fibers are pulled up. Annual report printed materials often need to be sent to different climatic regions, especially in terms of cold and hot cycles.
The annual report brochure has high value and relatively small printing volume. The cost of glue usually accounts for less than 1%, but the loss from one rework may be several times the annual glue cost. It is not recommended to use low-priced universal glue to save money for this type of work. Choosing a specialized model is the most cost-effective approach.
Q: Can we switch to using lockwire glue instead?
Answer: When the budget allows, locking wire glue is indeed more stable, especially suitable for thick books over 200 pages. But there is also a requirement for adhesive, which still needs to be fixed with adhesive after locking the wire.
Q: Why is it easier for the touch film cover to peel off?
Answer: The surface energy of the tactile film is low, and the adhesive solution is not easily wetted. It is recommended to do partial non lamination or deburring treatment in the spine area on the inside of the cover.
Q: Will low odor models sacrifice strength?
Answer: Mature formulas do not. Low odor is mainly controlled by the purity of raw materials and production processes, and is not a trade-off with peel strength.
Sunlife hot melt adhesive provides specialized grades for copperplate paper and laminated covers, while Guangzhou Sunlife Trading can provide sampling and cold and hot cycle testing support for annual report brochure projects.
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