Hot Melt PUR Bookbinding Glue
Hot Melt PUR Bookbinding Glue (Polyurethane Reactive Hot Melt Adhesive for Bookbinding, also called PUR book glue, moisture-curing bookbinding adhesive, high-strength book spine glue) is a professional reactive hot melt adhesive specifically formulated for bookbinding, perfect binding, and graphic arts applications. As a premium alternative to traditional EVA and solvent-based adhesives, it leverages moisture-curing technology-solid at room temperature, it melts when heated, forms an initial bond upon cooling, and then undergoes an irreversible crosslinking reaction with moisture in the air and book pages to create a strong, flexible, and durable bond.
Applications by Industry & Use Case
1. Book Publishing Industry (Primary Application)
The largest application sector for Hot Melt PUR Bookbinding Glue, accounting for 50% of global demand, as it meets the high-quality, durable binding needs of book publishers.
Textbooks & Educational Materials: Ideal for textbooks, workbooks, and reference books that require long-term durability and frequent use. The moisture-curing bond prevents page shedding even after repeated opening and closing, and the temperature resistance ensures stability in school storage rooms (hot or cold). Many South American countries mandate the use of PUR glue for textbooks due to its reliability.
Premium Books & Hardcovers: Used for hardcover books, art books, coffee table books, and rare books. The flexible bond allows the book to lie flat, enhancing reading comfort, while the irreversible crosslinking ensures the spine retains its shape (even for round-back hardcovers) and does not degrade over time.
Paperbacks & Mass-Market Books: Compatible with high-speed automatic perfect binding lines, supporting mass production of paperbacks (e.g., novels, magazines). The low glue consumption reduces costs, while the strong bond prevents page shedding during shipping and handling.
2. Printing & Graphic Arts Industry
Magazines & Catalogs: Used for binding magazines, catalogs, and brochures, especially those with UV-coated or glossy pages. PUR glue bonds effectively to coated surfaces, preventing delamination and ensuring the publication remains intact during distribution.
Photo Books & Scrapbooks: Archival-grade PUR glue is ideal for photo books and scrapbooks, as it is acid-free and lignin-free, preventing damage to photos and paper over time. The flexible bond allows the book to open flat, showcasing photos without creasing.
Corporate Brochures & Annual Reports: Provides a professional, clean finish for corporate materials, with no visible glue lines and strong durability. The solvent resistance ensures the binding remains intact even if the brochure comes into contact with printing solvents.
3. Stationery & Office Supplies Industry
Notebooks & Journals: Used for binding notebooks, journals, and diaries, both hardcover and paperback. The flexible bond allows the notebook to open flat, making writing easier, while the durability prevents page shedding with frequent use.
Binders & Document Covers: Used for binding loose documents, reports, and presentations into binders or hardcover document covers. The strong bond ensures documents remain secure, even with frequent handling.
Custom Stationery: Ideal for custom-made stationery (e.g., wedding invitations, greeting cards) that requires a premium finish. The clean, invisible bond enhances the aesthetic appeal of the stationery.
Properties
high bonding strength, good fluidity, no wire drawing, good thermal stability and operational performance, good heat and humidity resistance and chemical resistance.
Technical Properties
|
Appearance |
White solid, small granule |
|
Viscosity |
2500~5000mPa·s @130℃ |
|
Open time (depend on temperature and substrate) |
50~100s |
|
Package |
Aluminum foil bag 500～2000g, 20kg/barrel, 200 kg/barrel
|
|
Recommended melt/ sizing temperature |
120 ~ 140 ℃ |
|
Room temperature |
More than 15 ℃ |
Precautions
1. The surface of the substrate shall be free of oil, dust and other pollutants to ensure that the surface is clean and dry.
2. After the production equipment is used up, it shall be cleaned with special cleaning agent.
3. It shall not be mixed with other brands of hotmelt glue.
4. In order to achieve complete curing, the products that have completed the process operation are best placed in a working environment with appropriate temperature and humidity
(recommended temperature: 23 ~ 25 ℃, relative humidity about 65%)
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