What kind of hot melt adhesive particles are used to paste the hardcover book cover cloth? Complete tutorial from glue selection to machine operation

When pasting hardcover book cover cloth (flower cover cloth on both ends of the spine), it should be selectedHot melt adhesive particles for book and magazine binding with high initial adhesion, short opening time (3-6 seconds), and softening point of 80-95 ℃This process requires a small amount of glue, a narrow area, and quick positioning. The most typical consequence of using the wrong glue is that the stopper cloth has curled edges, the glue seeps and contaminates the cloth surface, or it falls off from both ends of the spine after being put on the shell.

Step 1: Clarify the three constraints of the plug cloth process

• Special substrateThe plug cloth is mostly made of cotton, polyester or polyester cotton blended woven tape, with warp and weft pores on the surface, and the glue is easy to penetrate through the fabric to the front.
• Narrow bonding surfaceThe effective bonding width is usually only 8-12mm, and the amount of adhesive must be precise. If there is more, it will overflow, and if there is less, it will be empty.
• It will be too hot in the futureAfter applying the plug cloth, it is necessary to stick the spine paper, cover the book, and press the groove machine. The adhesive layer should be able to withstand the temperature and compression of the subsequent process.

Step 2: Comparison of Particle Selection Parameters

Step 3: Computer operation process

• 1. Preheat the melt adhesive.Set the melt glue pot to 150-165 ℃, preheat for 25-30 minutes until completely melted, do not rush by raising the temperature.
• 2. Test the amount of adhesive adjustment.First, apply glue to the waste book core, visually inspect the glue line for continuity, width of 8-10mm, thickness of approximately 0.2mm, and no accumulation or breakage.
• 3. Positioning and fitting.Align the center of the stopper cloth with the centerline of the spine, leaving a 1-2mm margin at each end. After bonding, immediately use a pressure roller to roll in one direction along the spine for 2-3 seconds.
• 4. Cooling and shaping.Natural cooling should not be less than 30 seconds before entering the next process, and rushing to put on the book cover is the most likely to cause displacement.
• 5. First article inspection.The first piece of each batch should undergo a hand tear inspection, and the plug cloth should be torn with fibers. If the interface is smooth and falls off, it is considered unqualified.

Step 4: Quick Check for Common Malfunctions

• Adhesive dots appear on the fabric surfaceIf the viscosity is too low or the temperature is too high, cool it down by 5-8 ℃ first. If it still seeps, replace it with a high viscosity model.
• Lift both ends upwardsThe opening time is too short, and the adhesive has already dried before fitting. Shorten the interval between gluing and bonding, or switch to a model with a slightly longer opening time.
• After the shell is attached, it falls offThe softening point is relatively low, and it is softened again by the heat of the subsequent groove press. Switch to models with a softening point above 90 ℃.
• Intermittent glue lineIf the nozzle is partially blocked or the rubber particles contain impurities, clean the nozzle and check if the rubber particles are damp and clumped.

Frequently Asked Questions

Q: Can we use the same adhesive for the cover cloth and spine paper?
Answer: It can be used together, but it should be based on the requirements of the plug cloth (higher initial adhesion, slightly higher viscosity). If two processes share a glue pot, according to the parameters of the plug cloth, both sides can usually be taken into account.

Q: Can a glue gun be used for handmade small batch hardcover?
Answer: Yes, you can use the matching glue gun strip, but it should be noted that the amount of glue produced by the glue gun is not easy to control. It is recommended to practice on the waste material first and maintain a constant speed when shooting.

Q: How to quickly find the appropriate model?
Answer: Just provide the supplier with the weight of the spine paper, the material sample of the stopper cloth, and the temperature of the subsequent process. Guangzhou Sunlife Trading provides free sampling for Sunlife’s hot melt adhesive binding series, and determines the model after verifying the bonding with the customer’s actual plug cloth.