Heavy Duty Pure Paper Back Strip 85g for Thick Notebooks and Hardcover Books
Engineered for thicker notebooks and hardcover books (book thickness 4‑30mm), this 85 g/m² pure paper back strip offers increased stiffness and tear resistance (thickness 0.12‑0.13 mm). It provides superior spine reinforcement for books up to 30mm thick, preventing sagging and deformation over long‑term use. Compatible with perfect binding and thread‑sewn binding on high‑speed back strip machines (max 21 m/min).
Technical Specifications
| Parameter | Unit | Value |
|---|---|---|
| Basis Weight | g/m² | 85 ±2.5 |
| Thickness | mm | 0.12‑0.13 |
| Width | mm | 20‑50 (customizable) |
| Roll Length | m | 1000 |
| Folding Resistance | times | ≥60 |
| Tensile Strength MD | kN/m | ≥3.2 |
| Tensile Strength CD | kN/m | ≥1.6 |
| Moisture Content | % | ≤8 |
| Applicable Book Thickness | mm | up to 30 |
Process Introduction
Similar to the 80g grade but using a slightly heavier base paper. The paper is coated with a higher‑solids adhesive to ensure deep penetration into thicker spines. Drying temperature is precisely controlled to maintain stiffness without brittleness. Slitting widths are optimized for large‑format books (35‑50mm). Each roll is tested for thickness consistency and fold endurance.
Applications & Advantages by Category
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Hardcover Notebooks – Extra strength for diary and journal spines; resists cracking when opened flat.
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Textbooks & Reference Books – Withstands frequent use in schools and libraries.
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Photo Albums – Prevents spine sagging under weight of heavy pages.
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Archival Documents – Long‑term preservation without yellowing or embrittlement.
Why Choose This Paper – 85g pure paper back strip provides the extra rigidity needed for thick books, ensuring a professional, durable finish.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.