新闻中心
The spine of a round spine hardcover book is curved, and when opened, the book core bends along the curved surface. The adhesive layer needs to have good flexibility and resilience. Hard rubber particles have high adhesive strength but are prone to cracking when bent, while soft rubber particles are flexible but have insufficient adhesive strength – selection requires finding a balance between strength and flexibility.
| Comparison item | Soft rubber particles (low softening point) | Hard rubber particles (high softening point) |
|---|---|---|
| softening point | 65-80°C | 85-100°C |
| Bending rebound | Excellent, 180 ° repeated bending without cracks | Medium, visible fine lines after bending 3-5 times |
| peel strength | 2.5-3.5 N/cm | 4.0-5.5 N/cm |
| Circular spine retention force | Okay, the arc won’t bounce back naturally | Generally, the spine of the book tends to rebound and flatten |
| Applicable scenarios | Round spine hardcover, picture book, art book | Fangji hardcover, reference book |
Round spine hardcover is recommended with soft rubber particles or medium soft type – with sufficient adhesion, worry free bending, and stable curved shape. Recommended for square spine hardcover or thick reference books are hard rubber particles – with priority given to strength and better load-bearing capacity. Both types of Sunlife hot melt adhesive have corresponding models, and Guangzhou Sunlife Trading can recommend them for free based on spine thickness and binding method.
Hot melt adhesive pelletsThe most common work-related injury during homework is not machine injury, butAdhesive burns caused by molten adhesive at 160-180 ℃——Adhesive glue sticking to the skin will not flow away like boiling water and will continue to release heat. The key points of protection can be summarized in one sentence:First isolate the high-temperature […]
Choose hot melt adhesive granules and focus on 7 key parameters: softening point, melt viscosity, opening time, curing time, initial adhesion, temperature resistance range, color and appearance. This article compiles the meanings, common ranges, and selection points of each parameter into a table, which can be directly compared and used by procurement and technology. List […]
Trends in binding hot melt adhesives and polyolefin adhesives: In recent years, the binding industry has had to adapt to many changes, including increasing production line speed and adopting polyolefin (POE) adhesives. Which products can help you meet the demands brought about by these developments and why? Hot melt adhesive for faster binding line speed […]
Bonding solution of hot melt adhesive for hand-held bags. Paper bags are a part of our daily life. They come in a variety of shapes, substrates, sizes and colors. They are used for the packaging and transportation of important items such as food, gifts and clothes. For this reason, it is necessary to use high-quality […]
