Does EVA hot melt adhesive become brittle in winter and peel off in summer? Complete solution for equipment debugging and adhesive selection

EVA hot melt adhesive, which is brittle in winter and prone to cracking in summer, belongs to the normal characteristics of thermoplastic materials and is not a product quality issue. It is strongly recommended to prioritize adjusting equipment temperature and production processes, and replace seasonal adhesive when the environment is extreme. At the same time, it is strictly prohibited to mix different types of adhesive, which can completely solve this problem..

1. Cause of the problem: Why is it brittle in winter and cracked in summer

EVA hot melt adhesive belongs to thermoplastic materials, and the temperature will directly change the colloidal state.

• In winter, the temperature is low, the colloid hardens quickly, and the overall toughness decreases, making it easy to break and crack.
• In summer, with high temperatures, the softening rate of colloids accelerates, the bonding strength decreases, and it is prone to cracking and debonding. This phenomenon is common in the industry, and all conventional EVA hot melt adhesives are affected by environmental temperature.

2. Solution for glue becoming brittle and prone to breakage in winter

Prioritize debugging the equipment, and then replace the glue. Step by step operation can improve the situation.

1. Basic debugging: Increase the temperature of the glue tank by 5-10 ℃ to fully melt the glue and improve its fluidity and flexibility.
2. Equipment calibration: Check the temperature control instrument values against the actual temperature of the glue tank. If there is a significant deviation between the two, repair and calibrate the equipment.
3. Final solution: If the problem still exists after temperature adjustment, replace it with winter cold resistant EVA hot melt adhesive; The original glue is sealed and kept for use in warm seasons.

III. Solution for glue cracking and weak adhesion in summer

Summer glue opening is often related to the production process and glue type, and should be investigated and handled in order.

1. Process check: In summer, the ambient temperature is high, and the production line speed needs to be reduced to ensure that the glue is completely dry before proceeding with the pressurization operation; At the same time, check the thickness of the adhesive coating to avoid the coating being too thin.
2. Model replacement: If there are no abnormalities in the process and the adhesive still opens, choose a high softening point and high temperature resistant hot melt adhesive. It is recommended that the softening point be ≥ 100 ℃, which can withstand exposure to sunlight and high temperature transportation scenarios.
3. Procurement reminder: Notify the manufacturer of the on-site environmental temperature and production conditions before procurement to facilitate matching with the corresponding model.

4. Key pitfalls to avoid: It is strictly prohibited to mix winter and summer adhesives

Many factories mix leftover winter glue with summer glue, which is a typical mistake.

• The formula, softening point, and curing speed of hot melt adhesive vary in different seasons.
• Mixing can cause a series of problems such as wire drawing, glue blocking machine, and bonding failure.
• It is recommended to store and use the machine in separate areas, with dedicated glue.

5. Usage suggestions

1. Strictly follow the product manual and do not simplify processes or change parameters arbitrarily.
2. When it is impossible to determine the appropriate adhesive or debugging plan, a video of the production line can be taken and sent to technical personnel for remote diagnosis.
3. Replace glue and equipment parameters in advance according to the season to avoid project delays, material rework, and control production costs.

6. Common problems

Q: Is EVA hot melt adhesive brittle in winter and prone to cracking in summer due to poor adhesive quality?

A: No, it’s not. It is a normal characteristic for thermoplastic materials to be affected by temperature, which can be solved by adjusting equipment and replacing specialized adhesives.

Q: Can I use winter hot melt adhesive in summer?

A: No, it is highly likely to cause problems such as softening, glue opening, wire drawing, and equipment blockage.

Q: Can adjusting the temperature without changing the glue cope with the temperature difference in all seasons?

A: Feasible when the temperature difference is small; In high temperature exposure, severe cold and low temperature scenarios, it is necessary to replace the seasonal adhesive.

7. Contact us

1. Contact us through our official website’s online customer service;
2. Call 400-999-0766 or 199 6625 5042
3. Search official account: Guangzhou Sunlife;
4. Search Tiktok number: official account of Sunlife hot melt adhesive manufacturer