TPU hot melt adhesive film blisters easily after lamination
It is a common problem that TPU hot melt adhesive film blisters easily after lamination, which not only affects the appearance quality of the product, but also may have a negative impact on the performance of the product. Below, we will discuss this issue from the causes of blistering, preventive measures and solutions to three aspects.
First, the causes of blistering
1. Material problems: the quality of TPU hot melt adhesive film directly affects the lamination effect. If the film itself has quality problems, such as impurities, moisture content is too high, uneven thickness, etc., may lead to blistering after lamination.
2. Improper temperature control: In the lamination process, temperature control is crucial. If the temperature is too high, it may cause the adhesive film to melt too fast and produce a large amount of gas, thus forming bubbles. While the temperature is too low may lead to the film is not fully melted, the formation of incomplete adhesion, will also produce blistering.
3. Insufficient Pressure: During the lamination process, sufficient pressure needs to be applied so that the adhesive film and the substrate are fully in contact and bonded. If the pressure is insufficient, it may lead to the existence of gaps between the adhesive film and the substrate, resulting in blistering.
4. Environmental factors: Humidity, dust and other environmental factors in the laminating workshop may also have an effect on the laminating effect. Excessive humidity may cause the film to absorb moisture, reducing its viscosity; while dust may contaminate the surface of the film, affecting its bonding effect.
Second, preventive measures
1. Choose high quality materials: When purchasing TPU hot melt adhesive film, we should choose suppliers with stable quality and good reputation to ensure that the quality of the film meets the requirements.
2. Strictly control the temperature: In the lamination process, the lamination temperature and time should be set reasonably according to the characteristics of the film and the requirements of the substrate to ensure that the film can be fully melted and fully bonded with the substrate.
3. Keep the pressure stable: in the lamination process, should ensure that the pressure is stable and sufficient, so that there is no gap between the film and the substrate. At the same time, regular inspection and maintenance of pressure equipment to ensure its normal operation.
4. Optimize environmental conditions: The lamination workshop should maintain proper humidity and cleanliness to avoid the influence of dust and other pollutants on the adhesive film. Environmental conditions can be improved by installing equipment such as hygrometers and air purifiers.
III. Solutions
1. For products that have blistered, you can try to use a hot air gun or iron to heat the blistered area so that the adhesive film can be re-melted and bonded. However, this method may only be applicable to a small range of local blistering. 2.
2. For large areas of blistering or cases where product quality is seriously affected, re-lamination is recommended. Before re-laminating, factors such as material, temperature and pressure should be carefully checked to ensure that the laminating conditions meet the requirements.
3. If the blistering problem is recurring and cannot be solved effectively, it may be necessary to consider changing the adhesive film supplier or adjusting the lamination process. At the same time, it is recommended to make detailed records and analysis of the lamination process to find out the root cause of blistering and take corresponding measures to improve.
In conclusion, the blistering of TPU hot melt adhesive film after lamination is a problem that needs attention. By understanding the causes of blistering, taking effective preventive measures and solving the problems in time, we can ensure that the quality of the lamination effect is stable and meets the product requirements.
