Hot melt adhesive particle bonding thin paper below 60g selection list: 5 key parameters, one cannot be omitted

Why is it easy for thin paper adhesive to overturn?

Thin paper (dictionary paper, Bible paper, thin copperplate paper) with a surface area of less than 60g/m ² has a soft structure and quick adhesive absorption. After coating, the adhesive solution is prone to penetrate the paper surface, causing glue penetration or wrinkling. Choosing the wrong model may result in poor appearance, while selecting the wrong model may result in the entire batch being scrapped. The following are 5 key parameters that must be paid attention to when bonding thin paper.

List of 5 key parameters

• 1. Viscosity (mPa · s)Choose a high viscosity model (8000-12000mPa · s @ 180 ° C), as the high viscosity adhesive is not easily able to penetrate the thin paper
• 2. Opening hoursChoose a short opening time (1-2 seconds) fast curing type to reduce the window period for glue to penetrate into the paper
• 3. Glue application amountControl at 25-35g/m ², reducing 30-40% compared to conventional methods. The thinner the adhesive layer, the lower the risk of adhesive penetration
• 4. Coating temperatureReduced to 155-165 ° C (10-15 ° C lower than conventional), low temperature and high viscosity further inhibit penetration
• 5. Compression force and timeLight pressure (0.2-0.3MPa)+short-term (0.5-1 second), while high pressure may squeeze the glue out of the paper surface

Recommended model features

Sunlifehot melt adhesiveThe special model for thin paper has a viscosity of over 10000mPa · s and an opening time of 1.2 seconds, specifically developed for ultra-thin paper adhesive packaging such as dictionaries and Bibles. Guangzhou Sunlife Trading can recommend the most suitable model for free based on paper weight and binding speed.

Frequently Asked Questions

• Q: What should I do if the spine of the book wrinkles after being glued onto thin paper?
  A: Usually, penetration is caused by excessive glue application or high temperature. First, reduce the glue amount and temperature for testing.
• Q: Can I switch between mixing thin paper and thick paper in one line?
  A: When switching, first reduce the amount of glue applied and then change the type of glue particles. It is recommended to produce in batches to avoid frequent switching.
• Q: Is it necessary to use specialized adhesive particles for thin paper weighing less than 60g?
  A: Not necessary, but the risk of universal adhesive particle penetration is high, the yield is low, and the comprehensive cost of specialized models is lower.